mbed library sources. Supersedes mbed-src.
Fork of mbed-dev by
targets/TARGET_Silicon_Labs/TARGET_EFM32/spi_api.c@153:9398a535854b, 2016-12-22 (annotated)
- Committer:
- fwndz
- Date:
- Thu Dec 22 05:12:40 2016 +0000
- Revision:
- 153:9398a535854b
- Parent:
- 150:02e0a0aed4ec
device target maximize
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
<> | 144:ef7eb2e8f9f7 | 1 | /***************************************************************************//** |
<> | 144:ef7eb2e8f9f7 | 2 | * @file spi_api.c |
<> | 144:ef7eb2e8f9f7 | 3 | ******************************************************************************* |
<> | 144:ef7eb2e8f9f7 | 4 | * @section License |
<> | 144:ef7eb2e8f9f7 | 5 | * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b> |
<> | 144:ef7eb2e8f9f7 | 6 | ******************************************************************************* |
<> | 144:ef7eb2e8f9f7 | 7 | * |
<> | 144:ef7eb2e8f9f7 | 8 | * SPDX-License-Identifier: Apache-2.0 |
<> | 144:ef7eb2e8f9f7 | 9 | * |
<> | 144:ef7eb2e8f9f7 | 10 | * Licensed under the Apache License, Version 2.0 (the "License"); you may |
<> | 144:ef7eb2e8f9f7 | 11 | * not use this file except in compliance with the License. |
<> | 144:ef7eb2e8f9f7 | 12 | * You may obtain a copy of the License at |
<> | 144:ef7eb2e8f9f7 | 13 | * |
<> | 144:ef7eb2e8f9f7 | 14 | * http://www.apache.org/licenses/LICENSE-2.0 |
<> | 144:ef7eb2e8f9f7 | 15 | * |
<> | 144:ef7eb2e8f9f7 | 16 | * Unless required by applicable law or agreed to in writing, software |
<> | 144:ef7eb2e8f9f7 | 17 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
<> | 144:ef7eb2e8f9f7 | 18 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
<> | 144:ef7eb2e8f9f7 | 19 | * See the License for the specific language governing permissions and |
<> | 144:ef7eb2e8f9f7 | 20 | * limitations under the License. |
<> | 144:ef7eb2e8f9f7 | 21 | * |
<> | 144:ef7eb2e8f9f7 | 22 | ******************************************************************************/ |
<> | 144:ef7eb2e8f9f7 | 23 | |
<> | 144:ef7eb2e8f9f7 | 24 | #include "device.h" |
<> | 144:ef7eb2e8f9f7 | 25 | #include "clocking.h" |
<> | 144:ef7eb2e8f9f7 | 26 | #if DEVICE_SPI |
<> | 144:ef7eb2e8f9f7 | 27 | |
<> | 144:ef7eb2e8f9f7 | 28 | #include "mbed_assert.h" |
<> | 144:ef7eb2e8f9f7 | 29 | #include "PeripheralPins.h" |
<> | 144:ef7eb2e8f9f7 | 30 | #include "pinmap.h" |
<> | 144:ef7eb2e8f9f7 | 31 | #include "pinmap_function.h" |
<> | 150:02e0a0aed4ec | 32 | #include "mbed_error.h" |
<> | 144:ef7eb2e8f9f7 | 33 | |
<> | 144:ef7eb2e8f9f7 | 34 | #include "dma_api.h" |
<> | 144:ef7eb2e8f9f7 | 35 | #include "dma_api_HAL.h" |
<> | 144:ef7eb2e8f9f7 | 36 | #include "serial_api_HAL.h" |
<> | 144:ef7eb2e8f9f7 | 37 | #include "spi_api.h" |
<> | 144:ef7eb2e8f9f7 | 38 | #include "em_usart.h" |
<> | 144:ef7eb2e8f9f7 | 39 | #include "em_cmu.h" |
<> | 144:ef7eb2e8f9f7 | 40 | #include "em_dma.h" |
<> | 144:ef7eb2e8f9f7 | 41 | #include "sleep_api.h" |
<> | 144:ef7eb2e8f9f7 | 42 | #include "sleepmodes.h" |
<> | 144:ef7eb2e8f9f7 | 43 | |
<> | 144:ef7eb2e8f9f7 | 44 | static uint16_t fill_word = SPI_FILL_WORD; |
<> | 144:ef7eb2e8f9f7 | 45 | |
<> | 144:ef7eb2e8f9f7 | 46 | #define SPI_LEAST_ACTIVE_SLEEPMODE EM1 |
<> | 144:ef7eb2e8f9f7 | 47 | |
<> | 144:ef7eb2e8f9f7 | 48 | static inline CMU_Clock_TypeDef spi_get_clock_tree(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 49 | { |
<> | 144:ef7eb2e8f9f7 | 50 | switch ((int)obj->spi.spi) { |
<> | 144:ef7eb2e8f9f7 | 51 | #ifdef USART0 |
<> | 144:ef7eb2e8f9f7 | 52 | case SPI_0: |
<> | 144:ef7eb2e8f9f7 | 53 | return cmuClock_USART0; |
<> | 144:ef7eb2e8f9f7 | 54 | #endif |
<> | 144:ef7eb2e8f9f7 | 55 | #ifdef USART1 |
<> | 144:ef7eb2e8f9f7 | 56 | case SPI_1: |
<> | 144:ef7eb2e8f9f7 | 57 | return cmuClock_USART1; |
<> | 144:ef7eb2e8f9f7 | 58 | #endif |
<> | 144:ef7eb2e8f9f7 | 59 | #ifdef USART2 |
<> | 144:ef7eb2e8f9f7 | 60 | case SPI_2: |
<> | 144:ef7eb2e8f9f7 | 61 | return cmuClock_USART2; |
<> | 144:ef7eb2e8f9f7 | 62 | #endif |
<> | 144:ef7eb2e8f9f7 | 63 | default: |
<> | 144:ef7eb2e8f9f7 | 64 | error("Spi module not available.. Out of bound access."); |
<> | 144:ef7eb2e8f9f7 | 65 | return cmuClock_HFPER; |
<> | 144:ef7eb2e8f9f7 | 66 | } |
<> | 144:ef7eb2e8f9f7 | 67 | } |
<> | 144:ef7eb2e8f9f7 | 68 | |
<> | 144:ef7eb2e8f9f7 | 69 | static inline uint8_t spi_get_index(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 70 | { |
<> | 144:ef7eb2e8f9f7 | 71 | uint8_t index = 0; |
<> | 144:ef7eb2e8f9f7 | 72 | switch ((int)obj->spi.spi) { |
<> | 144:ef7eb2e8f9f7 | 73 | #ifdef USART0 |
<> | 144:ef7eb2e8f9f7 | 74 | case SPI_0: |
<> | 144:ef7eb2e8f9f7 | 75 | index = 0; |
<> | 144:ef7eb2e8f9f7 | 76 | break; |
<> | 144:ef7eb2e8f9f7 | 77 | #endif |
<> | 144:ef7eb2e8f9f7 | 78 | #ifdef USART1 |
<> | 144:ef7eb2e8f9f7 | 79 | case SPI_1: |
<> | 144:ef7eb2e8f9f7 | 80 | index = 1; |
<> | 144:ef7eb2e8f9f7 | 81 | break; |
<> | 144:ef7eb2e8f9f7 | 82 | #endif |
<> | 144:ef7eb2e8f9f7 | 83 | #ifdef USART2 |
<> | 144:ef7eb2e8f9f7 | 84 | case SPI_2: |
<> | 144:ef7eb2e8f9f7 | 85 | index = 2; |
<> | 144:ef7eb2e8f9f7 | 86 | break; |
<> | 144:ef7eb2e8f9f7 | 87 | #endif |
<> | 144:ef7eb2e8f9f7 | 88 | default: |
<> | 144:ef7eb2e8f9f7 | 89 | error("Spi module not available.. Out of bound access."); |
<> | 144:ef7eb2e8f9f7 | 90 | break; |
<> | 144:ef7eb2e8f9f7 | 91 | } |
<> | 144:ef7eb2e8f9f7 | 92 | return index; |
<> | 144:ef7eb2e8f9f7 | 93 | } |
<> | 144:ef7eb2e8f9f7 | 94 | |
<> | 144:ef7eb2e8f9f7 | 95 | uint8_t spi_get_module(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 96 | { |
<> | 144:ef7eb2e8f9f7 | 97 | return spi_get_index(obj); |
<> | 144:ef7eb2e8f9f7 | 98 | } |
<> | 144:ef7eb2e8f9f7 | 99 | |
<> | 144:ef7eb2e8f9f7 | 100 | static void usart_init(spi_t *obj, uint32_t baudrate, USART_Databits_TypeDef databits, bool master, USART_ClockMode_TypeDef clockMode ) |
<> | 144:ef7eb2e8f9f7 | 101 | { |
<> | 144:ef7eb2e8f9f7 | 102 | USART_InitSync_TypeDef init = USART_INITSYNC_DEFAULT; |
<> | 144:ef7eb2e8f9f7 | 103 | init.enable = usartDisable; |
<> | 144:ef7eb2e8f9f7 | 104 | init.baudrate = baudrate; |
<> | 144:ef7eb2e8f9f7 | 105 | init.databits = databits; |
<> | 144:ef7eb2e8f9f7 | 106 | init.master = master; |
<> | 144:ef7eb2e8f9f7 | 107 | init.msbf = 1; |
<> | 144:ef7eb2e8f9f7 | 108 | init.clockMode = clockMode; |
<> | 144:ef7eb2e8f9f7 | 109 | |
<> | 144:ef7eb2e8f9f7 | 110 | /* Determine the reference clock, because the correct clock may not be set up at init time (e.g. before main()) */ |
<> | 144:ef7eb2e8f9f7 | 111 | init.refFreq = REFERENCE_FREQUENCY; |
<> | 144:ef7eb2e8f9f7 | 112 | |
<> | 144:ef7eb2e8f9f7 | 113 | USART_InitSync(obj->spi.spi, &init); |
<> | 144:ef7eb2e8f9f7 | 114 | } |
<> | 144:ef7eb2e8f9f7 | 115 | |
<> | 144:ef7eb2e8f9f7 | 116 | void spi_preinit(spi_t *obj, PinName mosi, PinName miso, PinName clk, PinName cs) |
<> | 144:ef7eb2e8f9f7 | 117 | { |
<> | 144:ef7eb2e8f9f7 | 118 | SPIName spi_mosi = (SPIName) pinmap_peripheral(mosi, PinMap_SPI_MOSI); |
<> | 144:ef7eb2e8f9f7 | 119 | SPIName spi_miso = (SPIName) pinmap_peripheral(miso, PinMap_SPI_MISO); |
<> | 144:ef7eb2e8f9f7 | 120 | SPIName spi_clk = (SPIName) pinmap_peripheral(clk, PinMap_SPI_CLK); |
<> | 144:ef7eb2e8f9f7 | 121 | SPIName spi_cs = (SPIName) pinmap_peripheral(cs, PinMap_SPI_CS); |
<> | 144:ef7eb2e8f9f7 | 122 | SPIName spi_data = (SPIName) pinmap_merge(spi_mosi, spi_miso); |
<> | 144:ef7eb2e8f9f7 | 123 | SPIName spi_ctrl = (SPIName) pinmap_merge(spi_clk, spi_cs); |
<> | 144:ef7eb2e8f9f7 | 124 | |
<> | 144:ef7eb2e8f9f7 | 125 | obj->spi.spi = (USART_TypeDef *) pinmap_merge(spi_data, spi_ctrl); |
<> | 144:ef7eb2e8f9f7 | 126 | MBED_ASSERT((int) obj->spi.spi != NC); |
<> | 144:ef7eb2e8f9f7 | 127 | |
<> | 144:ef7eb2e8f9f7 | 128 | if (cs != NC) { /* Slave mode */ |
<> | 144:ef7eb2e8f9f7 | 129 | obj->spi.master = false; |
<> | 144:ef7eb2e8f9f7 | 130 | } else { |
<> | 144:ef7eb2e8f9f7 | 131 | obj->spi.master = true; |
<> | 144:ef7eb2e8f9f7 | 132 | } |
<> | 144:ef7eb2e8f9f7 | 133 | |
<> | 144:ef7eb2e8f9f7 | 134 | #if defined(_SILICON_LABS_32B_PLATFORM_1) |
<> | 144:ef7eb2e8f9f7 | 135 | // On P1, we need to ensure all pins are on same location |
<> | 144:ef7eb2e8f9f7 | 136 | uint32_t loc_mosi = pin_location(mosi, PinMap_SPI_MOSI); |
<> | 144:ef7eb2e8f9f7 | 137 | uint32_t loc_miso = pin_location(miso, PinMap_SPI_MISO); |
<> | 144:ef7eb2e8f9f7 | 138 | uint32_t loc_clk = pin_location(clk, PinMap_SPI_CLK); |
<> | 144:ef7eb2e8f9f7 | 139 | uint32_t loc_cs = pin_location(cs, PinMap_SPI_CS); |
<> | 144:ef7eb2e8f9f7 | 140 | uint32_t loc_data = pinmap_merge(loc_mosi, loc_miso); |
<> | 144:ef7eb2e8f9f7 | 141 | uint32_t loc_ctrl = pinmap_merge(loc_clk, loc_cs); |
<> | 144:ef7eb2e8f9f7 | 142 | obj->spi.location = pinmap_merge(loc_data, loc_ctrl); |
<> | 144:ef7eb2e8f9f7 | 143 | MBED_ASSERT(obj->spi.location != NC); |
<> | 144:ef7eb2e8f9f7 | 144 | #endif |
<> | 144:ef7eb2e8f9f7 | 145 | |
<> | 144:ef7eb2e8f9f7 | 146 | obj->spi.dmaOptionsTX.dmaUsageState = DMA_USAGE_OPPORTUNISTIC; |
<> | 144:ef7eb2e8f9f7 | 147 | } |
<> | 144:ef7eb2e8f9f7 | 148 | |
<> | 144:ef7eb2e8f9f7 | 149 | void spi_enable_pins(spi_t *obj, uint8_t enable, PinName mosi, PinName miso, PinName clk, PinName cs) |
<> | 144:ef7eb2e8f9f7 | 150 | { |
<> | 144:ef7eb2e8f9f7 | 151 | if (enable) { |
<> | 144:ef7eb2e8f9f7 | 152 | if (obj->spi.master) { /* Master mode */ |
<> | 144:ef7eb2e8f9f7 | 153 | /* Either mosi or miso can be NC */ |
<> | 144:ef7eb2e8f9f7 | 154 | if (mosi != NC) { |
<> | 144:ef7eb2e8f9f7 | 155 | pin_mode(mosi, PushPull); |
<> | 144:ef7eb2e8f9f7 | 156 | } |
<> | 144:ef7eb2e8f9f7 | 157 | if (miso != NC) { |
<> | 144:ef7eb2e8f9f7 | 158 | pin_mode(miso, Input); |
<> | 144:ef7eb2e8f9f7 | 159 | } |
<> | 144:ef7eb2e8f9f7 | 160 | pin_mode(clk, PushPull); |
<> | 144:ef7eb2e8f9f7 | 161 | /* Don't set cs pin, since we toggle it manually */ |
<> | 144:ef7eb2e8f9f7 | 162 | } else { /* Slave mode */ |
<> | 144:ef7eb2e8f9f7 | 163 | if (mosi != NC) { |
<> | 144:ef7eb2e8f9f7 | 164 | pin_mode(mosi, Input); |
<> | 144:ef7eb2e8f9f7 | 165 | } |
<> | 144:ef7eb2e8f9f7 | 166 | if (miso != NC) { |
<> | 144:ef7eb2e8f9f7 | 167 | pin_mode(miso, PushPull); |
<> | 144:ef7eb2e8f9f7 | 168 | } |
<> | 144:ef7eb2e8f9f7 | 169 | pin_mode(clk, Input); |
<> | 144:ef7eb2e8f9f7 | 170 | pin_mode(cs, Input); |
<> | 144:ef7eb2e8f9f7 | 171 | } |
<> | 144:ef7eb2e8f9f7 | 172 | } else { |
<> | 144:ef7eb2e8f9f7 | 173 | // TODO_LP return PinMode to the previous state |
<> | 144:ef7eb2e8f9f7 | 174 | if (obj->spi.master) { /* Master mode */ |
<> | 144:ef7eb2e8f9f7 | 175 | /* Either mosi or miso can be NC */ |
<> | 144:ef7eb2e8f9f7 | 176 | if (mosi != NC) { |
<> | 144:ef7eb2e8f9f7 | 177 | pin_mode(mosi, Disabled); |
<> | 144:ef7eb2e8f9f7 | 178 | } |
<> | 144:ef7eb2e8f9f7 | 179 | if (miso != NC) { |
<> | 144:ef7eb2e8f9f7 | 180 | pin_mode(miso, Disabled); |
<> | 144:ef7eb2e8f9f7 | 181 | } |
<> | 144:ef7eb2e8f9f7 | 182 | pin_mode(clk, Disabled); |
<> | 144:ef7eb2e8f9f7 | 183 | /* Don't set cs pin, since we toggle it manually */ |
<> | 144:ef7eb2e8f9f7 | 184 | } else { /* Slave mode */ |
<> | 144:ef7eb2e8f9f7 | 185 | if (mosi != NC) { |
<> | 144:ef7eb2e8f9f7 | 186 | pin_mode(mosi, Disabled); |
<> | 144:ef7eb2e8f9f7 | 187 | } |
<> | 144:ef7eb2e8f9f7 | 188 | if (miso != NC) { |
<> | 144:ef7eb2e8f9f7 | 189 | pin_mode(miso, Disabled); |
<> | 144:ef7eb2e8f9f7 | 190 | } |
<> | 144:ef7eb2e8f9f7 | 191 | pin_mode(clk, Disabled); |
<> | 144:ef7eb2e8f9f7 | 192 | pin_mode(cs, Disabled); |
<> | 144:ef7eb2e8f9f7 | 193 | } |
<> | 144:ef7eb2e8f9f7 | 194 | } |
<> | 144:ef7eb2e8f9f7 | 195 | |
<> | 144:ef7eb2e8f9f7 | 196 | /* Enabling pins and setting location */ |
<> | 144:ef7eb2e8f9f7 | 197 | #ifdef _USART_ROUTEPEN_RESETVALUE |
<> | 144:ef7eb2e8f9f7 | 198 | uint32_t route = USART_ROUTEPEN_CLKPEN; |
<> | 144:ef7eb2e8f9f7 | 199 | obj->spi.spi->ROUTELOC0 &= ~_USART_ROUTELOC0_CLKLOC_MASK; |
<> | 144:ef7eb2e8f9f7 | 200 | obj->spi.spi->ROUTELOC0 |= pin_location(clk, PinMap_SPI_CLK)<<_USART_ROUTELOC0_CLKLOC_SHIFT; |
<> | 144:ef7eb2e8f9f7 | 201 | if (mosi != NC) { |
<> | 144:ef7eb2e8f9f7 | 202 | route |= USART_ROUTEPEN_TXPEN; |
<> | 144:ef7eb2e8f9f7 | 203 | obj->spi.spi->ROUTELOC0 &= ~_USART_ROUTELOC0_TXLOC_MASK; |
<> | 144:ef7eb2e8f9f7 | 204 | obj->spi.spi->ROUTELOC0 |= pin_location(mosi, PinMap_SPI_MOSI)<<_USART_ROUTELOC0_TXLOC_SHIFT; |
<> | 144:ef7eb2e8f9f7 | 205 | } |
<> | 144:ef7eb2e8f9f7 | 206 | if (miso != NC) { |
<> | 144:ef7eb2e8f9f7 | 207 | route |= USART_ROUTEPEN_RXPEN; |
<> | 144:ef7eb2e8f9f7 | 208 | obj->spi.spi->ROUTELOC0 &= ~_USART_ROUTELOC0_RXLOC_MASK; |
<> | 144:ef7eb2e8f9f7 | 209 | obj->spi.spi->ROUTELOC0 |= pin_location(miso, PinMap_SPI_MOSI)<<_USART_ROUTELOC0_RXLOC_SHIFT; |
<> | 144:ef7eb2e8f9f7 | 210 | } |
<> | 144:ef7eb2e8f9f7 | 211 | if (!obj->spi.master) { |
<> | 144:ef7eb2e8f9f7 | 212 | route |= USART_ROUTEPEN_CSPEN; |
<> | 144:ef7eb2e8f9f7 | 213 | obj->spi.spi->ROUTELOC0 &= ~_USART_ROUTELOC0_CSLOC_MASK; |
<> | 144:ef7eb2e8f9f7 | 214 | obj->spi.spi->ROUTELOC0 |= pin_location(cs, PinMap_SPI_MOSI)<<_USART_ROUTELOC0_CSLOC_SHIFT; |
<> | 144:ef7eb2e8f9f7 | 215 | } |
<> | 144:ef7eb2e8f9f7 | 216 | obj->spi.spi->ROUTEPEN = route; |
<> | 144:ef7eb2e8f9f7 | 217 | } |
<> | 144:ef7eb2e8f9f7 | 218 | #else |
<> | 144:ef7eb2e8f9f7 | 219 | uint32_t route = USART_ROUTE_CLKPEN | (obj->spi.location << _USART_ROUTE_LOCATION_SHIFT); |
<> | 144:ef7eb2e8f9f7 | 220 | |
<> | 144:ef7eb2e8f9f7 | 221 | if (mosi != NC) { |
<> | 144:ef7eb2e8f9f7 | 222 | route |= USART_ROUTE_TXPEN; |
<> | 144:ef7eb2e8f9f7 | 223 | } |
<> | 144:ef7eb2e8f9f7 | 224 | if (miso != NC) { |
<> | 144:ef7eb2e8f9f7 | 225 | route |= USART_ROUTE_RXPEN; |
<> | 144:ef7eb2e8f9f7 | 226 | } |
<> | 144:ef7eb2e8f9f7 | 227 | if (!obj->spi.master) { |
<> | 144:ef7eb2e8f9f7 | 228 | route |= USART_ROUTE_CSPEN; |
<> | 144:ef7eb2e8f9f7 | 229 | } |
<> | 144:ef7eb2e8f9f7 | 230 | obj->spi.spi->ROUTE = route; |
<> | 144:ef7eb2e8f9f7 | 231 | } |
<> | 144:ef7eb2e8f9f7 | 232 | #endif |
<> | 144:ef7eb2e8f9f7 | 233 | void spi_enable(spi_t *obj, uint8_t enable) |
<> | 144:ef7eb2e8f9f7 | 234 | { |
<> | 144:ef7eb2e8f9f7 | 235 | USART_Enable(obj->spi.spi, (enable ? usartEnable : usartDisable)); |
<> | 144:ef7eb2e8f9f7 | 236 | } |
<> | 144:ef7eb2e8f9f7 | 237 | |
<> | 144:ef7eb2e8f9f7 | 238 | void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName clk, PinName cs) |
<> | 144:ef7eb2e8f9f7 | 239 | { |
<> | 144:ef7eb2e8f9f7 | 240 | CMU_ClockEnable(cmuClock_HFPER, true); |
<> | 144:ef7eb2e8f9f7 | 241 | spi_preinit(obj, mosi, miso, clk, cs); |
<> | 144:ef7eb2e8f9f7 | 242 | CMU_ClockEnable(spi_get_clock_tree(obj), true); |
<> | 144:ef7eb2e8f9f7 | 243 | usart_init(obj, 100000, usartDatabits8, true, usartClockMode0); |
<> | 144:ef7eb2e8f9f7 | 244 | |
<> | 144:ef7eb2e8f9f7 | 245 | spi_enable_pins(obj, true, mosi, miso, clk, cs); |
<> | 144:ef7eb2e8f9f7 | 246 | spi_enable(obj, true); |
<> | 144:ef7eb2e8f9f7 | 247 | } |
<> | 144:ef7eb2e8f9f7 | 248 | |
<> | 144:ef7eb2e8f9f7 | 249 | void spi_enable_event(spi_t *obj, uint32_t event, uint8_t enable) |
<> | 144:ef7eb2e8f9f7 | 250 | { |
<> | 144:ef7eb2e8f9f7 | 251 | if(enable) obj->spi.event |= event; |
<> | 144:ef7eb2e8f9f7 | 252 | else obj->spi.event &= ~event; |
<> | 144:ef7eb2e8f9f7 | 253 | } |
<> | 144:ef7eb2e8f9f7 | 254 | |
<> | 144:ef7eb2e8f9f7 | 255 | /**************************************************************************** |
<> | 144:ef7eb2e8f9f7 | 256 | * void spi_enable_interrupt(spi_t *obj, uint32_t handler, uint8_t enable) |
<> | 144:ef7eb2e8f9f7 | 257 | * |
<> | 144:ef7eb2e8f9f7 | 258 | * This will enable the interrupt in NVIC for the associated USART RX channel |
<> | 144:ef7eb2e8f9f7 | 259 | * |
<> | 144:ef7eb2e8f9f7 | 260 | * * obj: pointer to spi object |
<> | 144:ef7eb2e8f9f7 | 261 | * * handler: pointer to interrupt handler for this channel |
<> | 144:ef7eb2e8f9f7 | 262 | * * enable: Whether to enable (true) or disable (false) the interrupt |
<> | 144:ef7eb2e8f9f7 | 263 | * |
<> | 144:ef7eb2e8f9f7 | 264 | ****************************************************************************/ |
<> | 144:ef7eb2e8f9f7 | 265 | void spi_enable_interrupt(spi_t *obj, uint32_t handler, uint8_t enable) |
<> | 144:ef7eb2e8f9f7 | 266 | { |
<> | 144:ef7eb2e8f9f7 | 267 | IRQn_Type IRQvector; |
<> | 144:ef7eb2e8f9f7 | 268 | |
<> | 144:ef7eb2e8f9f7 | 269 | switch ((uint32_t)obj->spi.spi) { |
<> | 144:ef7eb2e8f9f7 | 270 | #ifdef USART0 |
<> | 144:ef7eb2e8f9f7 | 271 | case USART_0: |
<> | 144:ef7eb2e8f9f7 | 272 | IRQvector = USART0_RX_IRQn; |
<> | 144:ef7eb2e8f9f7 | 273 | break; |
<> | 144:ef7eb2e8f9f7 | 274 | #endif |
<> | 144:ef7eb2e8f9f7 | 275 | #ifdef USART1 |
<> | 144:ef7eb2e8f9f7 | 276 | case USART_1: |
<> | 144:ef7eb2e8f9f7 | 277 | IRQvector = USART1_RX_IRQn; |
<> | 144:ef7eb2e8f9f7 | 278 | break; |
<> | 144:ef7eb2e8f9f7 | 279 | #endif |
<> | 144:ef7eb2e8f9f7 | 280 | #ifdef USART2 |
<> | 144:ef7eb2e8f9f7 | 281 | case USART_2: |
<> | 144:ef7eb2e8f9f7 | 282 | IRQvector = USART2_RX_IRQn; |
<> | 144:ef7eb2e8f9f7 | 283 | break; |
<> | 144:ef7eb2e8f9f7 | 284 | #endif |
<> | 144:ef7eb2e8f9f7 | 285 | default: |
<> | 144:ef7eb2e8f9f7 | 286 | error("Undefined SPI peripheral"); |
<> | 144:ef7eb2e8f9f7 | 287 | return; |
<> | 144:ef7eb2e8f9f7 | 288 | } |
<> | 144:ef7eb2e8f9f7 | 289 | |
<> | 144:ef7eb2e8f9f7 | 290 | if (enable == true) { |
<> | 144:ef7eb2e8f9f7 | 291 | NVIC_SetVector(IRQvector, handler); |
<> | 144:ef7eb2e8f9f7 | 292 | USART_IntEnable(obj->spi.spi, USART_IEN_RXDATAV); |
<> | 144:ef7eb2e8f9f7 | 293 | NVIC_EnableIRQ(IRQvector); |
<> | 144:ef7eb2e8f9f7 | 294 | } else { |
<> | 144:ef7eb2e8f9f7 | 295 | NVIC_SetVector(IRQvector, handler); |
<> | 144:ef7eb2e8f9f7 | 296 | USART_IntDisable(obj->spi.spi, USART_IEN_RXDATAV); |
<> | 144:ef7eb2e8f9f7 | 297 | NVIC_DisableIRQ(IRQvector); |
<> | 144:ef7eb2e8f9f7 | 298 | } |
<> | 144:ef7eb2e8f9f7 | 299 | } |
<> | 144:ef7eb2e8f9f7 | 300 | |
<> | 144:ef7eb2e8f9f7 | 301 | void spi_format(spi_t *obj, int bits, int mode, int slave) |
<> | 144:ef7eb2e8f9f7 | 302 | { |
<> | 144:ef7eb2e8f9f7 | 303 | /* Bits: values between 4 and 16 are valid */ |
<> | 144:ef7eb2e8f9f7 | 304 | MBED_ASSERT(bits >= 4 && bits <= 16); |
<> | 144:ef7eb2e8f9f7 | 305 | obj->spi.bits = bits; |
<> | 144:ef7eb2e8f9f7 | 306 | /* 0x01 = usartDatabits4, etc, up to 0x0D = usartDatabits16 */ |
<> | 144:ef7eb2e8f9f7 | 307 | USART_Databits_TypeDef databits = (USART_Databits_TypeDef) (bits - 3); |
<> | 144:ef7eb2e8f9f7 | 308 | |
<> | 144:ef7eb2e8f9f7 | 309 | USART_ClockMode_TypeDef clockMode; |
<> | 144:ef7eb2e8f9f7 | 310 | MBED_ASSERT(mode >= 0 && mode <= 3); |
<> | 144:ef7eb2e8f9f7 | 311 | switch (mode) { |
<> | 144:ef7eb2e8f9f7 | 312 | case 0: |
<> | 144:ef7eb2e8f9f7 | 313 | clockMode = usartClockMode0; |
<> | 144:ef7eb2e8f9f7 | 314 | break; |
<> | 144:ef7eb2e8f9f7 | 315 | case 1: |
<> | 144:ef7eb2e8f9f7 | 316 | clockMode = usartClockMode1; |
<> | 144:ef7eb2e8f9f7 | 317 | break; |
<> | 144:ef7eb2e8f9f7 | 318 | case 2: |
<> | 144:ef7eb2e8f9f7 | 319 | clockMode = usartClockMode2; |
<> | 144:ef7eb2e8f9f7 | 320 | break; |
<> | 144:ef7eb2e8f9f7 | 321 | case 3: |
<> | 144:ef7eb2e8f9f7 | 322 | clockMode = usartClockMode3; |
<> | 144:ef7eb2e8f9f7 | 323 | break; |
<> | 144:ef7eb2e8f9f7 | 324 | default: |
<> | 144:ef7eb2e8f9f7 | 325 | clockMode = usartClockMode0; |
<> | 144:ef7eb2e8f9f7 | 326 | } |
<> | 144:ef7eb2e8f9f7 | 327 | |
<> | 144:ef7eb2e8f9f7 | 328 | //save state |
<> | 144:ef7eb2e8f9f7 | 329 | #ifdef _USART_ROUTEPEN_RESETVALUE |
<> | 144:ef7eb2e8f9f7 | 330 | uint32_t route = obj->spi.spi->ROUTEPEN; |
<> | 144:ef7eb2e8f9f7 | 331 | uint32_t loc = obj->spi.spi->ROUTELOC0; |
<> | 144:ef7eb2e8f9f7 | 332 | #else |
<> | 144:ef7eb2e8f9f7 | 333 | uint32_t route = obj->spi.spi->ROUTE; |
<> | 144:ef7eb2e8f9f7 | 334 | #endif |
<> | 144:ef7eb2e8f9f7 | 335 | uint32_t iflags = obj->spi.spi->IEN; |
<> | 144:ef7eb2e8f9f7 | 336 | bool enabled = (obj->spi.spi->STATUS & (USART_STATUS_RXENS | USART_STATUS_TXENS)) != 0; |
<> | 144:ef7eb2e8f9f7 | 337 | |
<> | 144:ef7eb2e8f9f7 | 338 | usart_init(obj, 100000, databits, (slave ? false : true), clockMode); |
<> | 144:ef7eb2e8f9f7 | 339 | |
<> | 144:ef7eb2e8f9f7 | 340 | //restore state |
<> | 144:ef7eb2e8f9f7 | 341 | #ifdef _USART_ROUTEPEN_RESETVALUE |
<> | 144:ef7eb2e8f9f7 | 342 | obj->spi.spi->ROUTEPEN = route; |
<> | 144:ef7eb2e8f9f7 | 343 | obj->spi.spi->ROUTELOC0 = loc; |
<> | 144:ef7eb2e8f9f7 | 344 | #else |
<> | 144:ef7eb2e8f9f7 | 345 | obj->spi.spi->ROUTE = route; |
<> | 144:ef7eb2e8f9f7 | 346 | #endif |
<> | 144:ef7eb2e8f9f7 | 347 | obj->spi.spi->IEN = iflags; |
<> | 144:ef7eb2e8f9f7 | 348 | |
<> | 144:ef7eb2e8f9f7 | 349 | if(enabled) spi_enable(obj, enabled); |
<> | 144:ef7eb2e8f9f7 | 350 | } |
<> | 144:ef7eb2e8f9f7 | 351 | |
<> | 144:ef7eb2e8f9f7 | 352 | void spi_frequency(spi_t *obj, int hz) |
<> | 144:ef7eb2e8f9f7 | 353 | { |
<> | 144:ef7eb2e8f9f7 | 354 | USART_BaudrateSyncSet(obj->spi.spi, REFERENCE_FREQUENCY, hz); |
<> | 144:ef7eb2e8f9f7 | 355 | } |
<> | 144:ef7eb2e8f9f7 | 356 | |
<> | 144:ef7eb2e8f9f7 | 357 | /* Read/Write */ |
<> | 144:ef7eb2e8f9f7 | 358 | |
<> | 144:ef7eb2e8f9f7 | 359 | void spi_write(spi_t *obj, int value) |
<> | 144:ef7eb2e8f9f7 | 360 | { |
<> | 144:ef7eb2e8f9f7 | 361 | if (obj->spi.bits <= 8) { |
<> | 144:ef7eb2e8f9f7 | 362 | USART_Tx(obj->spi.spi, (uint8_t) value); |
<> | 144:ef7eb2e8f9f7 | 363 | } else if (obj->spi.bits == 9) { |
<> | 144:ef7eb2e8f9f7 | 364 | USART_TxExt(obj->spi.spi, (uint16_t) value & 0x1FF); |
<> | 144:ef7eb2e8f9f7 | 365 | } else { |
<> | 144:ef7eb2e8f9f7 | 366 | USART_TxDouble(obj->spi.spi, (uint16_t) value); |
<> | 144:ef7eb2e8f9f7 | 367 | } |
<> | 144:ef7eb2e8f9f7 | 368 | } |
<> | 144:ef7eb2e8f9f7 | 369 | |
<> | 144:ef7eb2e8f9f7 | 370 | int spi_read(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 371 | { |
<> | 144:ef7eb2e8f9f7 | 372 | if (obj->spi.bits <= 8) { |
<> | 144:ef7eb2e8f9f7 | 373 | return (int) obj->spi.spi->RXDATA; |
<> | 144:ef7eb2e8f9f7 | 374 | } else if (obj->spi.bits == 9) { |
<> | 144:ef7eb2e8f9f7 | 375 | return (int) obj->spi.spi->RXDATAX & 0x1FF; |
<> | 144:ef7eb2e8f9f7 | 376 | } else { |
<> | 144:ef7eb2e8f9f7 | 377 | return (int) obj->spi.spi->RXDOUBLE; |
<> | 144:ef7eb2e8f9f7 | 378 | } |
<> | 144:ef7eb2e8f9f7 | 379 | } |
<> | 144:ef7eb2e8f9f7 | 380 | |
<> | 144:ef7eb2e8f9f7 | 381 | int spi_read_asynch(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 382 | { |
<> | 144:ef7eb2e8f9f7 | 383 | return spi_read(obj); |
<> | 144:ef7eb2e8f9f7 | 384 | } |
<> | 144:ef7eb2e8f9f7 | 385 | |
<> | 144:ef7eb2e8f9f7 | 386 | int spi_master_write(spi_t *obj, int value) |
<> | 144:ef7eb2e8f9f7 | 387 | { |
<> | 144:ef7eb2e8f9f7 | 388 | spi_write(obj, value); |
<> | 144:ef7eb2e8f9f7 | 389 | |
<> | 144:ef7eb2e8f9f7 | 390 | /* Wait for transmission of last byte */ |
<> | 144:ef7eb2e8f9f7 | 391 | while (!(obj->spi.spi->STATUS & USART_STATUS_TXC)) { |
<> | 144:ef7eb2e8f9f7 | 392 | } |
<> | 144:ef7eb2e8f9f7 | 393 | |
<> | 144:ef7eb2e8f9f7 | 394 | return spi_read(obj); |
<> | 144:ef7eb2e8f9f7 | 395 | } |
<> | 144:ef7eb2e8f9f7 | 396 | |
<> | 144:ef7eb2e8f9f7 | 397 | inline uint8_t spi_master_tx_ready(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 398 | { |
<> | 144:ef7eb2e8f9f7 | 399 | return (obj->spi.spi->STATUS & USART_STATUS_TXBL) ? true : false; |
<> | 144:ef7eb2e8f9f7 | 400 | } |
<> | 144:ef7eb2e8f9f7 | 401 | |
<> | 144:ef7eb2e8f9f7 | 402 | uint8_t spi_master_rx_ready(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 403 | { |
<> | 144:ef7eb2e8f9f7 | 404 | return (obj->spi.spi->STATUS & USART_STATUS_RXDATAV) ? true : false; |
<> | 144:ef7eb2e8f9f7 | 405 | } |
<> | 144:ef7eb2e8f9f7 | 406 | |
<> | 144:ef7eb2e8f9f7 | 407 | uint8_t spi_master_tx_int_flag(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 408 | { |
<> | 144:ef7eb2e8f9f7 | 409 | return (obj->spi.spi->IF & USART_IF_TXBL) ? true : false; |
<> | 144:ef7eb2e8f9f7 | 410 | } |
<> | 144:ef7eb2e8f9f7 | 411 | |
<> | 144:ef7eb2e8f9f7 | 412 | uint8_t spi_master_rx_int_flag(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 413 | { |
<> | 144:ef7eb2e8f9f7 | 414 | return (obj->spi.spi->IF & (USART_IF_RXDATAV | USART_IF_RXFULL)) ? true : false; |
<> | 144:ef7eb2e8f9f7 | 415 | } |
<> | 144:ef7eb2e8f9f7 | 416 | |
<> | 144:ef7eb2e8f9f7 | 417 | void spi_master_read_asynch_complete(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 418 | { |
<> | 144:ef7eb2e8f9f7 | 419 | obj->spi.spi->IFC = USART_IFC_RXFULL; // in case it got full |
<> | 144:ef7eb2e8f9f7 | 420 | } |
<> | 144:ef7eb2e8f9f7 | 421 | |
<> | 144:ef7eb2e8f9f7 | 422 | void spi_master_write_asynch_complete(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 423 | { |
<> | 144:ef7eb2e8f9f7 | 424 | obj->spi.spi->IFC = USART_IFC_TXC; |
<> | 144:ef7eb2e8f9f7 | 425 | } |
<> | 144:ef7eb2e8f9f7 | 426 | |
<> | 144:ef7eb2e8f9f7 | 427 | void spi_irq_handler(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 428 | { |
<> | 144:ef7eb2e8f9f7 | 429 | spi_read(obj); //TODO_LP store data to the object? |
<> | 144:ef7eb2e8f9f7 | 430 | } |
<> | 144:ef7eb2e8f9f7 | 431 | |
<> | 144:ef7eb2e8f9f7 | 432 | uint8_t spi_active(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 433 | { |
<> | 144:ef7eb2e8f9f7 | 434 | switch(obj->spi.dmaOptionsTX.dmaUsageState) { |
<> | 144:ef7eb2e8f9f7 | 435 | case DMA_USAGE_TEMPORARY_ALLOCATED: |
<> | 144:ef7eb2e8f9f7 | 436 | return true; |
<> | 144:ef7eb2e8f9f7 | 437 | case DMA_USAGE_ALLOCATED: |
<> | 144:ef7eb2e8f9f7 | 438 | /* Check whether the allocated DMA channel is active */ |
<> | 144:ef7eb2e8f9f7 | 439 | #ifdef LDMA_PRESENT |
<> | 144:ef7eb2e8f9f7 | 440 | return(LDMAx_ChannelEnabled(obj->spi.dmaOptionsTX.dmaChannel) || LDMAx_ChannelEnabled(obj->spi.dmaOptionsRX.dmaChannel)); |
<> | 144:ef7eb2e8f9f7 | 441 | #else |
<> | 144:ef7eb2e8f9f7 | 442 | return(DMA_ChannelEnabled(obj->spi.dmaOptionsTX.dmaChannel) || DMA_ChannelEnabled(obj->spi.dmaOptionsRX.dmaChannel)); |
<> | 144:ef7eb2e8f9f7 | 443 | #endif |
<> | 144:ef7eb2e8f9f7 | 444 | default: |
<> | 144:ef7eb2e8f9f7 | 445 | /* Check whether interrupt for spi is enabled */ |
<> | 144:ef7eb2e8f9f7 | 446 | return (obj->spi.spi->IEN & (USART_IEN_RXDATAV | USART_IEN_TXBL)) ? true : false; |
<> | 144:ef7eb2e8f9f7 | 447 | } |
<> | 144:ef7eb2e8f9f7 | 448 | } |
<> | 144:ef7eb2e8f9f7 | 449 | |
<> | 144:ef7eb2e8f9f7 | 450 | void spi_buffer_set(spi_t *obj, const void *tx, uint32_t tx_length, void *rx, uint32_t rx_length, uint8_t bit_width) |
<> | 144:ef7eb2e8f9f7 | 451 | { |
<> | 144:ef7eb2e8f9f7 | 452 | uint32_t i; |
<> | 144:ef7eb2e8f9f7 | 453 | uint16_t *tx_ptr = (uint16_t *) tx; |
<> | 144:ef7eb2e8f9f7 | 454 | |
<> | 144:ef7eb2e8f9f7 | 455 | obj->tx_buff.buffer = (void *)tx; |
<> | 144:ef7eb2e8f9f7 | 456 | obj->rx_buff.buffer = rx; |
<> | 144:ef7eb2e8f9f7 | 457 | obj->tx_buff.length = tx_length; |
<> | 144:ef7eb2e8f9f7 | 458 | obj->rx_buff.length = rx_length; |
<> | 144:ef7eb2e8f9f7 | 459 | obj->tx_buff.pos = 0; |
<> | 144:ef7eb2e8f9f7 | 460 | obj->rx_buff.pos = 0; |
<> | 144:ef7eb2e8f9f7 | 461 | obj->tx_buff.width = bit_width; |
<> | 144:ef7eb2e8f9f7 | 462 | obj->rx_buff.width = bit_width; |
<> | 144:ef7eb2e8f9f7 | 463 | |
<> | 144:ef7eb2e8f9f7 | 464 | if((obj->spi.bits == 9) && (tx != 0)) { |
<> | 144:ef7eb2e8f9f7 | 465 | // Make sure we don't have inadvertent non-zero bits outside 9-bit frames which could trigger unwanted operation |
<> | 144:ef7eb2e8f9f7 | 466 | for(i = 0; i < (tx_length / 2); i++) { |
<> | 144:ef7eb2e8f9f7 | 467 | tx_ptr[i] &= 0x1FF; |
<> | 144:ef7eb2e8f9f7 | 468 | } |
<> | 144:ef7eb2e8f9f7 | 469 | } |
<> | 144:ef7eb2e8f9f7 | 470 | } |
<> | 144:ef7eb2e8f9f7 | 471 | |
<> | 144:ef7eb2e8f9f7 | 472 | static void spi_buffer_tx_write(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 473 | { |
<> | 144:ef7eb2e8f9f7 | 474 | uint32_t data = 0; |
<> | 144:ef7eb2e8f9f7 | 475 | |
<> | 144:ef7eb2e8f9f7 | 476 | // Interpret buffer according to declared width |
<> | 144:ef7eb2e8f9f7 | 477 | if (!obj->tx_buff.buffer) { |
<> | 144:ef7eb2e8f9f7 | 478 | data = SPI_FILL_WORD; |
<> | 144:ef7eb2e8f9f7 | 479 | } else if (obj->tx_buff.width == 32) { |
<> | 144:ef7eb2e8f9f7 | 480 | uint32_t * tx = (uint32_t *)obj->tx_buff.buffer; |
<> | 144:ef7eb2e8f9f7 | 481 | data = tx[obj->tx_buff.pos]; |
<> | 144:ef7eb2e8f9f7 | 482 | } else if (obj->tx_buff.width == 16) { |
<> | 144:ef7eb2e8f9f7 | 483 | uint16_t * tx = (uint16_t *)obj->tx_buff.buffer; |
<> | 144:ef7eb2e8f9f7 | 484 | data = tx[obj->tx_buff.pos]; |
<> | 144:ef7eb2e8f9f7 | 485 | } else { |
<> | 144:ef7eb2e8f9f7 | 486 | uint8_t * tx = (uint8_t *)obj->tx_buff.buffer; |
<> | 144:ef7eb2e8f9f7 | 487 | data = tx[obj->tx_buff.pos]; |
<> | 144:ef7eb2e8f9f7 | 488 | } |
<> | 144:ef7eb2e8f9f7 | 489 | obj->tx_buff.pos++; |
<> | 144:ef7eb2e8f9f7 | 490 | |
<> | 144:ef7eb2e8f9f7 | 491 | // Send buffer |
<> | 144:ef7eb2e8f9f7 | 492 | if (obj->spi.bits > 9) { |
<> | 144:ef7eb2e8f9f7 | 493 | obj->spi.spi->TXDOUBLE = data; |
<> | 144:ef7eb2e8f9f7 | 494 | } else if (obj->spi.bits == 9) { |
<> | 144:ef7eb2e8f9f7 | 495 | obj->spi.spi->TXDATAX = data; |
<> | 144:ef7eb2e8f9f7 | 496 | } else { |
<> | 144:ef7eb2e8f9f7 | 497 | obj->spi.spi->TXDATA = data; |
<> | 144:ef7eb2e8f9f7 | 498 | } |
<> | 144:ef7eb2e8f9f7 | 499 | } |
<> | 144:ef7eb2e8f9f7 | 500 | |
<> | 144:ef7eb2e8f9f7 | 501 | static void spi_buffer_rx_read(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 502 | { |
<> | 144:ef7eb2e8f9f7 | 503 | uint32_t data; |
<> | 144:ef7eb2e8f9f7 | 504 | |
<> | 144:ef7eb2e8f9f7 | 505 | if (obj->spi.spi->STATUS & USART_STATUS_RXDATAV) { |
<> | 144:ef7eb2e8f9f7 | 506 | // Read from the FIFO |
<> | 144:ef7eb2e8f9f7 | 507 | if (obj->spi.bits > 9) { |
<> | 144:ef7eb2e8f9f7 | 508 | data = obj->spi.spi->RXDOUBLE; |
<> | 144:ef7eb2e8f9f7 | 509 | } else if (obj->spi.bits == 9) { |
<> | 144:ef7eb2e8f9f7 | 510 | data = obj->spi.spi->RXDATAX; |
<> | 144:ef7eb2e8f9f7 | 511 | } else { |
<> | 144:ef7eb2e8f9f7 | 512 | data = obj->spi.spi->RXDATA; |
<> | 144:ef7eb2e8f9f7 | 513 | } |
<> | 144:ef7eb2e8f9f7 | 514 | |
<> | 144:ef7eb2e8f9f7 | 515 | // If there is room in the buffer, store the data |
<> | 144:ef7eb2e8f9f7 | 516 | if (obj->rx_buff.buffer && obj->rx_buff.pos < obj->rx_buff.length) { |
<> | 144:ef7eb2e8f9f7 | 517 | if (obj->rx_buff.width == 32) { |
<> | 144:ef7eb2e8f9f7 | 518 | uint32_t * rx = (uint32_t *)(obj->rx_buff.buffer); |
<> | 144:ef7eb2e8f9f7 | 519 | rx[obj->rx_buff.pos] = data; |
<> | 144:ef7eb2e8f9f7 | 520 | } else if (obj->rx_buff.width == 16) { |
<> | 144:ef7eb2e8f9f7 | 521 | uint16_t * rx = (uint16_t *)(obj->rx_buff.buffer); |
<> | 144:ef7eb2e8f9f7 | 522 | rx[obj->rx_buff.pos] = data; |
<> | 144:ef7eb2e8f9f7 | 523 | } else { |
<> | 144:ef7eb2e8f9f7 | 524 | uint8_t * rx = (uint8_t *)(obj->rx_buff.buffer); |
<> | 144:ef7eb2e8f9f7 | 525 | rx[obj->rx_buff.pos] = data; |
<> | 144:ef7eb2e8f9f7 | 526 | } |
<> | 144:ef7eb2e8f9f7 | 527 | obj->rx_buff.pos++; |
<> | 144:ef7eb2e8f9f7 | 528 | } |
<> | 144:ef7eb2e8f9f7 | 529 | } |
<> | 144:ef7eb2e8f9f7 | 530 | } |
<> | 144:ef7eb2e8f9f7 | 531 | |
<> | 144:ef7eb2e8f9f7 | 532 | int spi_master_write_asynch(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 533 | { |
<> | 144:ef7eb2e8f9f7 | 534 | int ndata = 0; |
<> | 144:ef7eb2e8f9f7 | 535 | while ((obj->tx_buff.pos < obj->tx_buff.length) && (obj->spi.spi->STATUS & USART_STATUS_TXBL)) { |
<> | 144:ef7eb2e8f9f7 | 536 | spi_buffer_tx_write(obj); |
<> | 144:ef7eb2e8f9f7 | 537 | ndata++; |
<> | 144:ef7eb2e8f9f7 | 538 | } |
<> | 144:ef7eb2e8f9f7 | 539 | return ndata; |
<> | 144:ef7eb2e8f9f7 | 540 | } |
<> | 144:ef7eb2e8f9f7 | 541 | |
<> | 144:ef7eb2e8f9f7 | 542 | int spi_master_read_asynch(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 543 | { |
<> | 144:ef7eb2e8f9f7 | 544 | int ndata = 0; |
<> | 144:ef7eb2e8f9f7 | 545 | while ((obj->rx_buff.pos < obj->rx_buff.length) && (obj->spi.spi->STATUS & (USART_STATUS_RXDATAV | USART_STATUS_RXFULL))) { |
<> | 144:ef7eb2e8f9f7 | 546 | spi_buffer_rx_read(obj); |
<> | 144:ef7eb2e8f9f7 | 547 | ndata++; |
<> | 144:ef7eb2e8f9f7 | 548 | } |
<> | 144:ef7eb2e8f9f7 | 549 | // all sent but still more to receive? need to align tx buffer |
<> | 144:ef7eb2e8f9f7 | 550 | if ((obj->tx_buff.pos >= obj->tx_buff.length) && (obj->rx_buff.pos < obj->rx_buff.length)) { |
<> | 144:ef7eb2e8f9f7 | 551 | obj->tx_buff.buffer = (void *)0; |
<> | 144:ef7eb2e8f9f7 | 552 | obj->tx_buff.length = obj->rx_buff.length; |
<> | 144:ef7eb2e8f9f7 | 553 | } |
<> | 144:ef7eb2e8f9f7 | 554 | |
<> | 144:ef7eb2e8f9f7 | 555 | return ndata; |
<> | 144:ef7eb2e8f9f7 | 556 | } |
<> | 144:ef7eb2e8f9f7 | 557 | |
<> | 144:ef7eb2e8f9f7 | 558 | uint8_t spi_buffer_rx_empty(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 559 | { |
<> | 144:ef7eb2e8f9f7 | 560 | return (obj->rx_buff.pos >= obj->rx_buff.length ? true : false ); |
<> | 144:ef7eb2e8f9f7 | 561 | } |
<> | 144:ef7eb2e8f9f7 | 562 | |
<> | 144:ef7eb2e8f9f7 | 563 | uint8_t spi_buffer_tx_empty(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 564 | { |
<> | 144:ef7eb2e8f9f7 | 565 | return (obj->tx_buff.pos >= obj->tx_buff.length ? true : false ); |
<> | 144:ef7eb2e8f9f7 | 566 | } |
<> | 144:ef7eb2e8f9f7 | 567 | |
<> | 144:ef7eb2e8f9f7 | 568 | //TODO_LP implement slave |
<> | 144:ef7eb2e8f9f7 | 569 | |
<> | 144:ef7eb2e8f9f7 | 570 | int spi_slave_receive(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 571 | { |
<> | 144:ef7eb2e8f9f7 | 572 | if (obj->spi.bits <= 9) { |
<> | 144:ef7eb2e8f9f7 | 573 | return (obj->spi.spi->STATUS & USART_STATUS_RXDATAV) ? 1 : 0; |
<> | 144:ef7eb2e8f9f7 | 574 | } else { |
<> | 144:ef7eb2e8f9f7 | 575 | return (obj->spi.spi->STATUS & USART_STATUS_RXFULL) ? 1 : 0; |
<> | 144:ef7eb2e8f9f7 | 576 | } |
<> | 144:ef7eb2e8f9f7 | 577 | } |
<> | 144:ef7eb2e8f9f7 | 578 | |
<> | 144:ef7eb2e8f9f7 | 579 | int spi_slave_read(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 580 | { |
<> | 144:ef7eb2e8f9f7 | 581 | return spi_read(obj); |
<> | 144:ef7eb2e8f9f7 | 582 | } |
<> | 144:ef7eb2e8f9f7 | 583 | |
<> | 144:ef7eb2e8f9f7 | 584 | void spi_slave_write(spi_t *obj, int value) |
<> | 144:ef7eb2e8f9f7 | 585 | { |
<> | 144:ef7eb2e8f9f7 | 586 | spi_write(obj, value); |
<> | 144:ef7eb2e8f9f7 | 587 | } |
<> | 144:ef7eb2e8f9f7 | 588 | |
<> | 144:ef7eb2e8f9f7 | 589 | uint32_t spi_event_check(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 590 | { |
<> | 144:ef7eb2e8f9f7 | 591 | uint32_t requestedEvent = obj->spi.event; |
<> | 144:ef7eb2e8f9f7 | 592 | uint32_t event = 0; |
<> | 144:ef7eb2e8f9f7 | 593 | uint8_t quit = spi_buffer_rx_empty(obj) & spi_buffer_tx_empty(obj); |
<> | 144:ef7eb2e8f9f7 | 594 | if (((requestedEvent & SPI_EVENT_COMPLETE) != 0) && (quit == true)) { |
<> | 144:ef7eb2e8f9f7 | 595 | event |= SPI_EVENT_COMPLETE; |
<> | 144:ef7eb2e8f9f7 | 596 | } |
<> | 144:ef7eb2e8f9f7 | 597 | |
<> | 144:ef7eb2e8f9f7 | 598 | if(quit == true) { |
<> | 144:ef7eb2e8f9f7 | 599 | event |= SPI_EVENT_INTERNAL_TRANSFER_COMPLETE; |
<> | 144:ef7eb2e8f9f7 | 600 | } |
<> | 144:ef7eb2e8f9f7 | 601 | |
<> | 144:ef7eb2e8f9f7 | 602 | return event; |
<> | 144:ef7eb2e8f9f7 | 603 | } |
<> | 144:ef7eb2e8f9f7 | 604 | /****************************************** |
<> | 144:ef7eb2e8f9f7 | 605 | * void transferComplete(uint channel, bool primary, void* user) |
<> | 144:ef7eb2e8f9f7 | 606 | * |
<> | 144:ef7eb2e8f9f7 | 607 | * Callback function which gets called upon DMA transfer completion |
<> | 144:ef7eb2e8f9f7 | 608 | * the user-defined pointer is pointing to the CPP-land thunk |
<> | 144:ef7eb2e8f9f7 | 609 | ******************************************/ |
<> | 144:ef7eb2e8f9f7 | 610 | void transferComplete(unsigned int channel, bool primary, void *user) |
<> | 144:ef7eb2e8f9f7 | 611 | { |
<> | 144:ef7eb2e8f9f7 | 612 | (void) channel; |
<> | 144:ef7eb2e8f9f7 | 613 | (void) primary; |
<> | 144:ef7eb2e8f9f7 | 614 | |
<> | 144:ef7eb2e8f9f7 | 615 | /* User pointer should be a thunk to CPP land */ |
<> | 144:ef7eb2e8f9f7 | 616 | if (user != NULL) { |
<> | 144:ef7eb2e8f9f7 | 617 | ((DMACallback)user)(); |
<> | 144:ef7eb2e8f9f7 | 618 | } |
<> | 144:ef7eb2e8f9f7 | 619 | } |
<> | 144:ef7eb2e8f9f7 | 620 | |
<> | 144:ef7eb2e8f9f7 | 621 | /****************************************** |
<> | 144:ef7eb2e8f9f7 | 622 | * bool spi_allocate_dma(spi_t *obj); |
<> | 144:ef7eb2e8f9f7 | 623 | * (helper function for spi_enable_dma) |
<> | 144:ef7eb2e8f9f7 | 624 | * |
<> | 144:ef7eb2e8f9f7 | 625 | * This function will request two DMA channels from the DMA API if needed |
<> | 144:ef7eb2e8f9f7 | 626 | * by the hint provided. They will be allocated to the SPI object pointed to. |
<> | 144:ef7eb2e8f9f7 | 627 | * |
<> | 144:ef7eb2e8f9f7 | 628 | * return value: whether the channels were acquired successfully (true) or not. |
<> | 144:ef7eb2e8f9f7 | 629 | ******************************************/ |
<> | 144:ef7eb2e8f9f7 | 630 | bool spi_allocate_dma(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 631 | { |
<> | 144:ef7eb2e8f9f7 | 632 | int dmaChannelIn, dmaChannelOut; |
<> | 144:ef7eb2e8f9f7 | 633 | dmaChannelIn = dma_channel_allocate(DMA_CAP_NONE); |
<> | 144:ef7eb2e8f9f7 | 634 | if (dmaChannelIn == DMA_ERROR_OUT_OF_CHANNELS) { |
<> | 144:ef7eb2e8f9f7 | 635 | return false; |
<> | 144:ef7eb2e8f9f7 | 636 | } |
<> | 144:ef7eb2e8f9f7 | 637 | dmaChannelOut = dma_channel_allocate(DMA_CAP_NONE); |
<> | 144:ef7eb2e8f9f7 | 638 | if (dmaChannelOut == DMA_ERROR_OUT_OF_CHANNELS) { |
<> | 144:ef7eb2e8f9f7 | 639 | dma_channel_free(dmaChannelIn); |
<> | 144:ef7eb2e8f9f7 | 640 | return false; |
<> | 144:ef7eb2e8f9f7 | 641 | } |
<> | 144:ef7eb2e8f9f7 | 642 | |
<> | 144:ef7eb2e8f9f7 | 643 | obj->spi.dmaOptionsTX.dmaChannel = dmaChannelOut; |
<> | 144:ef7eb2e8f9f7 | 644 | obj->spi.dmaOptionsRX.dmaChannel = dmaChannelIn; |
<> | 144:ef7eb2e8f9f7 | 645 | return true; |
<> | 144:ef7eb2e8f9f7 | 646 | } |
<> | 144:ef7eb2e8f9f7 | 647 | |
<> | 144:ef7eb2e8f9f7 | 648 | /****************************************** |
<> | 144:ef7eb2e8f9f7 | 649 | * void spi_enable_dma(spi_t *obj, DMAUsage state) |
<> | 144:ef7eb2e8f9f7 | 650 | * |
<> | 144:ef7eb2e8f9f7 | 651 | * This function tries to allocate DMA as indicated by the hint (state). |
<> | 144:ef7eb2e8f9f7 | 652 | * There are three possibilities: |
<> | 144:ef7eb2e8f9f7 | 653 | * * state = NEVER: |
<> | 144:ef7eb2e8f9f7 | 654 | * if there were channels allocated by state = ALWAYS, they will be released |
<> | 144:ef7eb2e8f9f7 | 655 | * * state = OPPORTUNITIC: |
<> | 144:ef7eb2e8f9f7 | 656 | * if there are channels available, they will get used, but freed upon transfer completion |
<> | 144:ef7eb2e8f9f7 | 657 | * * state = ALWAYS |
<> | 144:ef7eb2e8f9f7 | 658 | * if there are channels available, they will get allocated and not be freed until state changes |
<> | 144:ef7eb2e8f9f7 | 659 | ******************************************/ |
<> | 144:ef7eb2e8f9f7 | 660 | void spi_enable_dma(spi_t *obj, DMAUsage state) |
<> | 144:ef7eb2e8f9f7 | 661 | { |
<> | 144:ef7eb2e8f9f7 | 662 | if (state == DMA_USAGE_ALWAYS && obj->spi.dmaOptionsTX.dmaUsageState != DMA_USAGE_ALLOCATED) { |
<> | 144:ef7eb2e8f9f7 | 663 | /* Try to allocate channels */ |
<> | 144:ef7eb2e8f9f7 | 664 | if (spi_allocate_dma(obj)) { |
<> | 144:ef7eb2e8f9f7 | 665 | obj->spi.dmaOptionsTX.dmaUsageState = DMA_USAGE_ALLOCATED; |
<> | 144:ef7eb2e8f9f7 | 666 | } else { |
<> | 144:ef7eb2e8f9f7 | 667 | obj->spi.dmaOptionsTX.dmaUsageState = state; |
<> | 144:ef7eb2e8f9f7 | 668 | } |
<> | 144:ef7eb2e8f9f7 | 669 | } else if (state == DMA_USAGE_OPPORTUNISTIC) { |
<> | 144:ef7eb2e8f9f7 | 670 | if (obj->spi.dmaOptionsTX.dmaUsageState == DMA_USAGE_ALLOCATED) { |
<> | 144:ef7eb2e8f9f7 | 671 | /* Channels have already been allocated previously by an ALWAYS state, so after this transfer, we will release them */ |
<> | 144:ef7eb2e8f9f7 | 672 | obj->spi.dmaOptionsTX.dmaUsageState = DMA_USAGE_TEMPORARY_ALLOCATED; |
<> | 144:ef7eb2e8f9f7 | 673 | } else { |
<> | 144:ef7eb2e8f9f7 | 674 | /* Try to allocate channels */ |
<> | 144:ef7eb2e8f9f7 | 675 | if (spi_allocate_dma(obj)) { |
<> | 144:ef7eb2e8f9f7 | 676 | obj->spi.dmaOptionsTX.dmaUsageState = DMA_USAGE_TEMPORARY_ALLOCATED; |
<> | 144:ef7eb2e8f9f7 | 677 | } else { |
<> | 144:ef7eb2e8f9f7 | 678 | obj->spi.dmaOptionsTX.dmaUsageState = state; |
<> | 144:ef7eb2e8f9f7 | 679 | } |
<> | 144:ef7eb2e8f9f7 | 680 | } |
<> | 144:ef7eb2e8f9f7 | 681 | } else if (state == DMA_USAGE_NEVER) { |
<> | 144:ef7eb2e8f9f7 | 682 | /* If channels are allocated, get rid of them */ |
<> | 144:ef7eb2e8f9f7 | 683 | if (obj->spi.dmaOptionsTX.dmaUsageState == DMA_USAGE_ALLOCATED) { |
<> | 144:ef7eb2e8f9f7 | 684 | dma_channel_free(obj->spi.dmaOptionsTX.dmaChannel); |
<> | 144:ef7eb2e8f9f7 | 685 | dma_channel_free(obj->spi.dmaOptionsRX.dmaChannel); |
<> | 144:ef7eb2e8f9f7 | 686 | } |
<> | 144:ef7eb2e8f9f7 | 687 | obj->spi.dmaOptionsTX.dmaUsageState = DMA_USAGE_NEVER; |
<> | 144:ef7eb2e8f9f7 | 688 | } |
<> | 144:ef7eb2e8f9f7 | 689 | } |
<> | 144:ef7eb2e8f9f7 | 690 | |
<> | 144:ef7eb2e8f9f7 | 691 | #ifdef LDMA_PRESENT |
<> | 144:ef7eb2e8f9f7 | 692 | /************************************************************************************ |
<> | 144:ef7eb2e8f9f7 | 693 | * DMA helper functions * |
<> | 144:ef7eb2e8f9f7 | 694 | ************************************************************************************/ |
<> | 144:ef7eb2e8f9f7 | 695 | /****************************************** |
<> | 144:ef7eb2e8f9f7 | 696 | * static void serial_dmaTransferComplete(uint channel, bool primary, void* user) |
<> | 144:ef7eb2e8f9f7 | 697 | * |
<> | 144:ef7eb2e8f9f7 | 698 | * Callback function which gets called upon DMA transfer completion |
<> | 144:ef7eb2e8f9f7 | 699 | * the user-defined pointer is pointing to the CPP-land thunk |
<> | 144:ef7eb2e8f9f7 | 700 | ******************************************/ |
<> | 144:ef7eb2e8f9f7 | 701 | static void serial_dmaTransferComplete(unsigned int channel, bool primary, void *user) |
<> | 144:ef7eb2e8f9f7 | 702 | { |
<> | 144:ef7eb2e8f9f7 | 703 | |
<> | 144:ef7eb2e8f9f7 | 704 | /* User pointer should be a thunk to CPP land */ |
<> | 144:ef7eb2e8f9f7 | 705 | if (user != NULL) { |
<> | 144:ef7eb2e8f9f7 | 706 | ((DMACallback)user)(); |
<> | 144:ef7eb2e8f9f7 | 707 | } |
<> | 144:ef7eb2e8f9f7 | 708 | } |
<> | 144:ef7eb2e8f9f7 | 709 | static void spi_master_dma_channel_setup(spi_t *obj, void* callback) |
<> | 144:ef7eb2e8f9f7 | 710 | { |
<> | 144:ef7eb2e8f9f7 | 711 | obj->spi.dmaOptionsRX.dmaCallback.userPtr = callback; |
<> | 144:ef7eb2e8f9f7 | 712 | } |
<> | 144:ef7eb2e8f9f7 | 713 | #else |
<> | 144:ef7eb2e8f9f7 | 714 | /****************************************** |
<> | 144:ef7eb2e8f9f7 | 715 | * void spi_master_dma_channel_setup(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 716 | * |
<> | 144:ef7eb2e8f9f7 | 717 | * This function will setup the DMA configuration for SPI transfers |
<> | 144:ef7eb2e8f9f7 | 718 | * |
<> | 144:ef7eb2e8f9f7 | 719 | * The channel numbers are fetched from the SPI instance, so this function |
<> | 144:ef7eb2e8f9f7 | 720 | * should only be called when those channels have actually been allocated. |
<> | 144:ef7eb2e8f9f7 | 721 | ******************************************/ |
<> | 144:ef7eb2e8f9f7 | 722 | static void spi_master_dma_channel_setup(spi_t *obj, void* callback) |
<> | 144:ef7eb2e8f9f7 | 723 | { |
<> | 144:ef7eb2e8f9f7 | 724 | DMA_CfgChannel_TypeDef rxChnlCfg; |
<> | 144:ef7eb2e8f9f7 | 725 | DMA_CfgChannel_TypeDef txChnlCfg; |
<> | 144:ef7eb2e8f9f7 | 726 | |
<> | 144:ef7eb2e8f9f7 | 727 | /* Setting up channel for rx. */ |
<> | 144:ef7eb2e8f9f7 | 728 | obj->spi.dmaOptionsRX.dmaCallback.cbFunc = transferComplete; |
<> | 144:ef7eb2e8f9f7 | 729 | obj->spi.dmaOptionsRX.dmaCallback.userPtr = callback; |
<> | 144:ef7eb2e8f9f7 | 730 | |
<> | 144:ef7eb2e8f9f7 | 731 | rxChnlCfg.highPri = false; |
<> | 144:ef7eb2e8f9f7 | 732 | rxChnlCfg.enableInt = true; |
<> | 144:ef7eb2e8f9f7 | 733 | rxChnlCfg.cb = &(obj->spi.dmaOptionsRX.dmaCallback); |
<> | 144:ef7eb2e8f9f7 | 734 | |
<> | 144:ef7eb2e8f9f7 | 735 | /* Setting up channel for tx. */ |
<> | 144:ef7eb2e8f9f7 | 736 | obj->spi.dmaOptionsTX.dmaCallback.cbFunc = transferComplete; |
<> | 144:ef7eb2e8f9f7 | 737 | obj->spi.dmaOptionsTX.dmaCallback.userPtr = callback; |
<> | 144:ef7eb2e8f9f7 | 738 | |
<> | 144:ef7eb2e8f9f7 | 739 | txChnlCfg.highPri = false; |
<> | 144:ef7eb2e8f9f7 | 740 | txChnlCfg.enableInt = true; |
<> | 144:ef7eb2e8f9f7 | 741 | txChnlCfg.cb = &(obj->spi.dmaOptionsTX.dmaCallback); |
<> | 144:ef7eb2e8f9f7 | 742 | |
<> | 144:ef7eb2e8f9f7 | 743 | switch ((int)obj->spi.spi) { |
<> | 144:ef7eb2e8f9f7 | 744 | #ifdef USART0 |
<> | 144:ef7eb2e8f9f7 | 745 | case SPI_0: |
<> | 144:ef7eb2e8f9f7 | 746 | rxChnlCfg.select = DMAREQ_USART0_RXDATAV; |
<> | 144:ef7eb2e8f9f7 | 747 | txChnlCfg.select = DMAREQ_USART0_TXEMPTY; |
<> | 144:ef7eb2e8f9f7 | 748 | break; |
<> | 144:ef7eb2e8f9f7 | 749 | #endif |
<> | 144:ef7eb2e8f9f7 | 750 | #ifdef USART1 |
<> | 144:ef7eb2e8f9f7 | 751 | case SPI_1: |
<> | 144:ef7eb2e8f9f7 | 752 | rxChnlCfg.select = DMAREQ_USART1_RXDATAV; |
<> | 144:ef7eb2e8f9f7 | 753 | txChnlCfg.select = DMAREQ_USART1_TXEMPTY; |
<> | 144:ef7eb2e8f9f7 | 754 | break; |
<> | 144:ef7eb2e8f9f7 | 755 | #endif |
<> | 144:ef7eb2e8f9f7 | 756 | #ifdef USART2 |
<> | 144:ef7eb2e8f9f7 | 757 | case SPI_2: |
<> | 144:ef7eb2e8f9f7 | 758 | rxChnlCfg.select = DMAREQ_USART2_RXDATAV; |
<> | 144:ef7eb2e8f9f7 | 759 | txChnlCfg.select = DMAREQ_USART2_TXEMPTY; |
<> | 144:ef7eb2e8f9f7 | 760 | break; |
<> | 144:ef7eb2e8f9f7 | 761 | #endif |
<> | 144:ef7eb2e8f9f7 | 762 | default: |
<> | 144:ef7eb2e8f9f7 | 763 | error("Spi module not available.. Out of bound access."); |
<> | 144:ef7eb2e8f9f7 | 764 | break; |
<> | 144:ef7eb2e8f9f7 | 765 | } |
<> | 144:ef7eb2e8f9f7 | 766 | DMA_CfgChannel(obj->spi.dmaOptionsRX.dmaChannel, &rxChnlCfg); |
<> | 144:ef7eb2e8f9f7 | 767 | DMA_CfgChannel(obj->spi.dmaOptionsTX.dmaChannel, &txChnlCfg); |
<> | 144:ef7eb2e8f9f7 | 768 | } |
<> | 144:ef7eb2e8f9f7 | 769 | #endif // LDMA_PRESENT |
<> | 144:ef7eb2e8f9f7 | 770 | /****************************************** |
<> | 144:ef7eb2e8f9f7 | 771 | * void spi_activate_dma(spi_t *obj, void* rxdata, void* txdata, int length) |
<> | 144:ef7eb2e8f9f7 | 772 | * |
<> | 144:ef7eb2e8f9f7 | 773 | * This function will start the DMA engine for SPI transfers |
<> | 144:ef7eb2e8f9f7 | 774 | * |
<> | 144:ef7eb2e8f9f7 | 775 | * * rxdata: pointer to RX buffer, if needed. |
<> | 144:ef7eb2e8f9f7 | 776 | * * txdata: pointer to TX buffer, if needed. Else FF's. |
<> | 144:ef7eb2e8f9f7 | 777 | * * tx_length: how many bytes will get sent. |
<> | 144:ef7eb2e8f9f7 | 778 | * * rx_length: how many bytes will get received. If > tx_length, TX will get padded with n lower bits of SPI_FILL_WORD. |
<> | 144:ef7eb2e8f9f7 | 779 | ******************************************/ |
<> | 144:ef7eb2e8f9f7 | 780 | #ifdef LDMA_PRESENT |
<> | 144:ef7eb2e8f9f7 | 781 | static void spi_activate_dma(spi_t *obj, void* rxdata, const void* txdata, int tx_length, int rx_length) |
<> | 144:ef7eb2e8f9f7 | 782 | { |
<> | 144:ef7eb2e8f9f7 | 783 | LDMA_PeripheralSignal_t dma_periph; |
<> | 144:ef7eb2e8f9f7 | 784 | |
<> | 144:ef7eb2e8f9f7 | 785 | if(rxdata) { |
<> | 144:ef7eb2e8f9f7 | 786 | volatile const void *source_addr; |
<> | 144:ef7eb2e8f9f7 | 787 | /* Select RX source address. 9 bit frame length requires to use extended register. |
<> | 144:ef7eb2e8f9f7 | 788 | 10 bit and larger frame requires to use RXDOUBLE register. */ |
<> | 144:ef7eb2e8f9f7 | 789 | switch((int)obj->spi.spi) { |
<> | 144:ef7eb2e8f9f7 | 790 | case USART_0: |
<> | 144:ef7eb2e8f9f7 | 791 | dma_periph = ldmaPeripheralSignal_USART0_RXDATAV; |
<> | 144:ef7eb2e8f9f7 | 792 | break; |
<> | 144:ef7eb2e8f9f7 | 793 | case USART_1: |
<> | 144:ef7eb2e8f9f7 | 794 | dma_periph = ldmaPeripheralSignal_USART1_RXDATAV; |
<> | 144:ef7eb2e8f9f7 | 795 | break; |
<> | 144:ef7eb2e8f9f7 | 796 | default: |
<> | 144:ef7eb2e8f9f7 | 797 | EFM_ASSERT(0); |
<> | 144:ef7eb2e8f9f7 | 798 | while(1); |
<> | 144:ef7eb2e8f9f7 | 799 | break; |
<> | 144:ef7eb2e8f9f7 | 800 | } |
<> | 144:ef7eb2e8f9f7 | 801 | |
<> | 144:ef7eb2e8f9f7 | 802 | if (obj->spi.bits <= 8) { |
<> | 144:ef7eb2e8f9f7 | 803 | source_addr = &obj->spi.spi->RXDATA; |
<> | 144:ef7eb2e8f9f7 | 804 | } else if (obj->spi.bits == 9) { |
<> | 144:ef7eb2e8f9f7 | 805 | source_addr = &obj->spi.spi->RXDATAX; |
<> | 144:ef7eb2e8f9f7 | 806 | } else { |
<> | 144:ef7eb2e8f9f7 | 807 | source_addr = &obj->spi.spi->RXDOUBLE; |
<> | 144:ef7eb2e8f9f7 | 808 | } |
<> | 144:ef7eb2e8f9f7 | 809 | |
<> | 144:ef7eb2e8f9f7 | 810 | LDMA_TransferCfg_t xferConf = LDMA_TRANSFER_CFG_PERIPHERAL(dma_periph); |
<> | 144:ef7eb2e8f9f7 | 811 | LDMA_Descriptor_t desc = LDMA_DESCRIPTOR_SINGLE_P2M_BYTE(source_addr, rxdata, rx_length); |
<> | 144:ef7eb2e8f9f7 | 812 | |
<> | 144:ef7eb2e8f9f7 | 813 | if(obj->spi.bits >= 9){ |
<> | 144:ef7eb2e8f9f7 | 814 | desc.xfer.size = ldmaCtrlSizeHalf; |
<> | 144:ef7eb2e8f9f7 | 815 | } |
<> | 144:ef7eb2e8f9f7 | 816 | |
<> | 144:ef7eb2e8f9f7 | 817 | if (obj->tx_buff.width == 32) { |
<> | 144:ef7eb2e8f9f7 | 818 | if (obj->spi.bits >= 9) { |
<> | 144:ef7eb2e8f9f7 | 819 | desc.xfer.dstInc = ldmaCtrlDstIncTwo; |
<> | 144:ef7eb2e8f9f7 | 820 | } else { |
<> | 144:ef7eb2e8f9f7 | 821 | desc.xfer.dstInc = ldmaCtrlDstIncFour; |
<> | 144:ef7eb2e8f9f7 | 822 | } |
<> | 144:ef7eb2e8f9f7 | 823 | } else if (obj->tx_buff.width == 16) { |
<> | 144:ef7eb2e8f9f7 | 824 | if (obj->spi.bits >= 9) { |
<> | 144:ef7eb2e8f9f7 | 825 | desc.xfer.dstInc = ldmaCtrlDstIncOne; |
<> | 144:ef7eb2e8f9f7 | 826 | } else { |
<> | 144:ef7eb2e8f9f7 | 827 | desc.xfer.dstInc = ldmaCtrlDstIncTwo; |
<> | 144:ef7eb2e8f9f7 | 828 | } |
<> | 144:ef7eb2e8f9f7 | 829 | } else { |
<> | 144:ef7eb2e8f9f7 | 830 | desc.xfer.dstInc = ldmaCtrlDstIncOne; |
<> | 144:ef7eb2e8f9f7 | 831 | } |
<> | 144:ef7eb2e8f9f7 | 832 | |
<> | 144:ef7eb2e8f9f7 | 833 | LDMAx_StartTransfer(obj->spi.dmaOptionsRX.dmaChannel, &xferConf, &desc, serial_dmaTransferComplete,obj->spi.dmaOptionsRX.dmaCallback.userPtr); |
<> | 144:ef7eb2e8f9f7 | 834 | } |
<> | 144:ef7eb2e8f9f7 | 835 | |
<> | 144:ef7eb2e8f9f7 | 836 | volatile void *target_addr; |
<> | 144:ef7eb2e8f9f7 | 837 | |
<> | 144:ef7eb2e8f9f7 | 838 | /* Select TX target address. 9 bit frame length requires to use extended register. |
<> | 144:ef7eb2e8f9f7 | 839 | 10 bit and larger frame requires to use TXDOUBLE register. */ |
<> | 144:ef7eb2e8f9f7 | 840 | switch ((int)obj->spi.spi) { |
<> | 144:ef7eb2e8f9f7 | 841 | case USART_0: |
<> | 144:ef7eb2e8f9f7 | 842 | dma_periph = ldmaPeripheralSignal_USART0_TXBL; |
<> | 144:ef7eb2e8f9f7 | 843 | break; |
<> | 144:ef7eb2e8f9f7 | 844 | case USART_1: |
<> | 144:ef7eb2e8f9f7 | 845 | dma_periph = ldmaPeripheralSignal_USART1_TXBL; |
<> | 144:ef7eb2e8f9f7 | 846 | break; |
<> | 144:ef7eb2e8f9f7 | 847 | default: |
<> | 144:ef7eb2e8f9f7 | 848 | EFM_ASSERT(0); |
<> | 144:ef7eb2e8f9f7 | 849 | while(1); |
<> | 144:ef7eb2e8f9f7 | 850 | break; |
<> | 144:ef7eb2e8f9f7 | 851 | } |
<> | 144:ef7eb2e8f9f7 | 852 | |
<> | 144:ef7eb2e8f9f7 | 853 | if (obj->spi.bits <= 8) { |
<> | 144:ef7eb2e8f9f7 | 854 | target_addr = &obj->spi.spi->TXDATA; |
<> | 144:ef7eb2e8f9f7 | 855 | } else if (obj->spi.bits == 9) { |
<> | 144:ef7eb2e8f9f7 | 856 | target_addr = &obj->spi.spi->TXDATAX; |
<> | 144:ef7eb2e8f9f7 | 857 | } else { |
<> | 144:ef7eb2e8f9f7 | 858 | target_addr = &obj->spi.spi->TXDOUBLE; |
<> | 144:ef7eb2e8f9f7 | 859 | } |
<> | 144:ef7eb2e8f9f7 | 860 | |
<> | 144:ef7eb2e8f9f7 | 861 | /* Check the transmit length, and split long transfers to smaller ones */ |
<> | 144:ef7eb2e8f9f7 | 862 | int max_length = 1024; |
<> | 144:ef7eb2e8f9f7 | 863 | #ifdef _LDMA_CH_CTRL_XFERCNT_MASK |
<> | 144:ef7eb2e8f9f7 | 864 | max_length = (_LDMA_CH_CTRL_XFERCNT_MASK>>_LDMA_CH_CTRL_XFERCNT_SHIFT)+1; |
<> | 144:ef7eb2e8f9f7 | 865 | #endif |
<> | 144:ef7eb2e8f9f7 | 866 | if (tx_length > max_length) { |
<> | 144:ef7eb2e8f9f7 | 867 | tx_length = max_length; |
<> | 144:ef7eb2e8f9f7 | 868 | } |
<> | 144:ef7eb2e8f9f7 | 869 | |
<> | 144:ef7eb2e8f9f7 | 870 | /* Save amount of TX done by DMA */ |
<> | 144:ef7eb2e8f9f7 | 871 | obj->tx_buff.pos += tx_length; |
<> | 144:ef7eb2e8f9f7 | 872 | |
<> | 144:ef7eb2e8f9f7 | 873 | LDMA_TransferCfg_t xferConf = LDMA_TRANSFER_CFG_PERIPHERAL(dma_periph); |
<> | 144:ef7eb2e8f9f7 | 874 | LDMA_Descriptor_t desc = LDMA_DESCRIPTOR_SINGLE_M2P_BYTE((txdata ? txdata : &fill_word), target_addr, tx_length); |
<> | 144:ef7eb2e8f9f7 | 875 | |
<> | 144:ef7eb2e8f9f7 | 876 | if (obj->spi.bits >= 9) { |
<> | 144:ef7eb2e8f9f7 | 877 | desc.xfer.size = ldmaCtrlSizeHalf; |
<> | 144:ef7eb2e8f9f7 | 878 | } |
<> | 144:ef7eb2e8f9f7 | 879 | |
<> | 144:ef7eb2e8f9f7 | 880 | if (!txdata) { |
<> | 144:ef7eb2e8f9f7 | 881 | desc.xfer.srcInc = ldmaCtrlSrcIncNone; |
<> | 144:ef7eb2e8f9f7 | 882 | } else if (obj->tx_buff.width == 32) { |
<> | 144:ef7eb2e8f9f7 | 883 | if (obj->spi.bits >= 9) { |
<> | 144:ef7eb2e8f9f7 | 884 | desc.xfer.srcInc = ldmaCtrlSrcIncTwo; |
<> | 144:ef7eb2e8f9f7 | 885 | } else { |
<> | 144:ef7eb2e8f9f7 | 886 | desc.xfer.srcInc = ldmaCtrlSrcIncFour; |
<> | 144:ef7eb2e8f9f7 | 887 | } |
<> | 144:ef7eb2e8f9f7 | 888 | } else if (obj->tx_buff.width == 16) { |
<> | 144:ef7eb2e8f9f7 | 889 | if (obj->spi.bits >= 9) { |
<> | 144:ef7eb2e8f9f7 | 890 | desc.xfer.srcInc = ldmaCtrlSrcIncOne; |
<> | 144:ef7eb2e8f9f7 | 891 | } else { |
<> | 144:ef7eb2e8f9f7 | 892 | desc.xfer.srcInc = ldmaCtrlSrcIncTwo; |
<> | 144:ef7eb2e8f9f7 | 893 | } |
<> | 144:ef7eb2e8f9f7 | 894 | } else { |
<> | 144:ef7eb2e8f9f7 | 895 | desc.xfer.srcInc = ldmaCtrlSrcIncOne; |
<> | 144:ef7eb2e8f9f7 | 896 | } |
<> | 144:ef7eb2e8f9f7 | 897 | |
<> | 144:ef7eb2e8f9f7 | 898 | // Kick off DMA TX |
<> | 144:ef7eb2e8f9f7 | 899 | LDMAx_StartTransfer(obj->spi.dmaOptionsTX.dmaChannel, &xferConf, &desc, serial_dmaTransferComplete,obj->spi.dmaOptionsTX.dmaCallback.userPtr); |
<> | 144:ef7eb2e8f9f7 | 900 | } |
<> | 144:ef7eb2e8f9f7 | 901 | |
<> | 144:ef7eb2e8f9f7 | 902 | #else |
<> | 144:ef7eb2e8f9f7 | 903 | /****************************************** |
<> | 144:ef7eb2e8f9f7 | 904 | * void spi_activate_dma(spi_t *obj, void* rxdata, void* txdata, int length) |
<> | 144:ef7eb2e8f9f7 | 905 | * |
<> | 144:ef7eb2e8f9f7 | 906 | * This function will start the DMA engine for SPI transfers |
<> | 144:ef7eb2e8f9f7 | 907 | * |
<> | 144:ef7eb2e8f9f7 | 908 | * * rxdata: pointer to RX buffer, if needed. |
<> | 144:ef7eb2e8f9f7 | 909 | * * txdata: pointer to TX buffer, if needed. Else FF's. |
<> | 144:ef7eb2e8f9f7 | 910 | * * tx_length: how many bytes will get sent. |
<> | 144:ef7eb2e8f9f7 | 911 | * * rx_length: how many bytes will get received. If > tx_length, TX will get padded with n lower bits of SPI_FILL_WORD. |
<> | 144:ef7eb2e8f9f7 | 912 | ******************************************/ |
<> | 144:ef7eb2e8f9f7 | 913 | static void spi_activate_dma(spi_t *obj, void* rxdata, const void* txdata, int tx_length, int rx_length) |
<> | 144:ef7eb2e8f9f7 | 914 | { |
<> | 144:ef7eb2e8f9f7 | 915 | /* DMA descriptors */ |
<> | 144:ef7eb2e8f9f7 | 916 | DMA_CfgDescr_TypeDef rxDescrCfg; |
<> | 144:ef7eb2e8f9f7 | 917 | DMA_CfgDescr_TypeDef txDescrCfg; |
<> | 144:ef7eb2e8f9f7 | 918 | |
<> | 144:ef7eb2e8f9f7 | 919 | /* Split up transfers if the length is larger than what the DMA supports. */ |
<> | 144:ef7eb2e8f9f7 | 920 | const int DMA_MAX_TRANSFER = (_DMA_CTRL_N_MINUS_1_MASK >> _DMA_CTRL_N_MINUS_1_SHIFT); |
<> | 144:ef7eb2e8f9f7 | 921 | |
<> | 144:ef7eb2e8f9f7 | 922 | if (tx_length > DMA_MAX_TRANSFER) { |
<> | 144:ef7eb2e8f9f7 | 923 | tx_length = DMA_MAX_TRANSFER; |
<> | 144:ef7eb2e8f9f7 | 924 | } |
<> | 144:ef7eb2e8f9f7 | 925 | if (rx_length > DMA_MAX_TRANSFER) { |
<> | 144:ef7eb2e8f9f7 | 926 | rx_length = DMA_MAX_TRANSFER; |
<> | 144:ef7eb2e8f9f7 | 927 | } |
<> | 144:ef7eb2e8f9f7 | 928 | |
<> | 144:ef7eb2e8f9f7 | 929 | /* Save amount of TX done by DMA */ |
<> | 144:ef7eb2e8f9f7 | 930 | obj->tx_buff.pos += tx_length; |
<> | 144:ef7eb2e8f9f7 | 931 | obj->rx_buff.pos += rx_length; |
<> | 144:ef7eb2e8f9f7 | 932 | |
<> | 144:ef7eb2e8f9f7 | 933 | /* Only activate RX DMA if a receive buffer is specified */ |
<> | 144:ef7eb2e8f9f7 | 934 | if (rxdata != NULL) { |
<> | 144:ef7eb2e8f9f7 | 935 | // Setting up channel descriptor |
<> | 144:ef7eb2e8f9f7 | 936 | if (obj->rx_buff.width == 32) { |
<> | 144:ef7eb2e8f9f7 | 937 | rxDescrCfg.dstInc = dmaDataInc4; |
<> | 144:ef7eb2e8f9f7 | 938 | } else if (obj->rx_buff.width == 16) { |
<> | 144:ef7eb2e8f9f7 | 939 | rxDescrCfg.dstInc = dmaDataInc2; |
<> | 144:ef7eb2e8f9f7 | 940 | } else { |
<> | 144:ef7eb2e8f9f7 | 941 | rxDescrCfg.dstInc = dmaDataInc1; |
<> | 144:ef7eb2e8f9f7 | 942 | } |
<> | 144:ef7eb2e8f9f7 | 943 | rxDescrCfg.srcInc = dmaDataIncNone; |
<> | 144:ef7eb2e8f9f7 | 944 | rxDescrCfg.size = (obj->spi.bits <= 8 ? dmaDataSize1 : dmaDataSize2); //When frame size >= 9, use RXDOUBLE |
<> | 144:ef7eb2e8f9f7 | 945 | rxDescrCfg.arbRate = dmaArbitrate1; |
<> | 144:ef7eb2e8f9f7 | 946 | rxDescrCfg.hprot = 0; |
<> | 144:ef7eb2e8f9f7 | 947 | DMA_CfgDescr(obj->spi.dmaOptionsRX.dmaChannel, true, &rxDescrCfg); |
<> | 144:ef7eb2e8f9f7 | 948 | |
<> | 144:ef7eb2e8f9f7 | 949 | void * rx_reg; |
<> | 144:ef7eb2e8f9f7 | 950 | if (obj->spi.bits > 9) { |
<> | 144:ef7eb2e8f9f7 | 951 | rx_reg = (void *)&obj->spi.spi->RXDOUBLE; |
<> | 144:ef7eb2e8f9f7 | 952 | } else if (obj->spi.bits == 9) { |
<> | 144:ef7eb2e8f9f7 | 953 | rx_reg = (void *)&obj->spi.spi->RXDATAX; |
<> | 144:ef7eb2e8f9f7 | 954 | } else { |
<> | 144:ef7eb2e8f9f7 | 955 | rx_reg = (void *)&obj->spi.spi->RXDATA; |
<> | 144:ef7eb2e8f9f7 | 956 | } |
<> | 144:ef7eb2e8f9f7 | 957 | |
<> | 144:ef7eb2e8f9f7 | 958 | /* Activate RX channel */ |
<> | 144:ef7eb2e8f9f7 | 959 | DMA_ActivateBasic(obj->spi.dmaOptionsRX.dmaChannel, |
<> | 144:ef7eb2e8f9f7 | 960 | true, |
<> | 144:ef7eb2e8f9f7 | 961 | false, |
<> | 144:ef7eb2e8f9f7 | 962 | rxdata, |
<> | 144:ef7eb2e8f9f7 | 963 | rx_reg, |
<> | 144:ef7eb2e8f9f7 | 964 | rx_length - 1); |
<> | 144:ef7eb2e8f9f7 | 965 | } |
<> | 144:ef7eb2e8f9f7 | 966 | |
<> | 144:ef7eb2e8f9f7 | 967 | // buffer with all FFs. |
<> | 144:ef7eb2e8f9f7 | 968 | /* Setting up channel descriptor */ |
<> | 144:ef7eb2e8f9f7 | 969 | txDescrCfg.dstInc = dmaDataIncNone; |
<> | 144:ef7eb2e8f9f7 | 970 | if (txdata == 0) { |
<> | 144:ef7eb2e8f9f7 | 971 | // Don't increment source when there is no transmit buffer |
<> | 144:ef7eb2e8f9f7 | 972 | txDescrCfg.srcInc = dmaDataIncNone; |
<> | 144:ef7eb2e8f9f7 | 973 | } else { |
<> | 144:ef7eb2e8f9f7 | 974 | if (obj->tx_buff.width == 32) { |
<> | 144:ef7eb2e8f9f7 | 975 | txDescrCfg.srcInc = dmaDataInc4; |
<> | 144:ef7eb2e8f9f7 | 976 | } else if (obj->tx_buff.width == 16) { |
<> | 144:ef7eb2e8f9f7 | 977 | txDescrCfg.srcInc = dmaDataInc2; |
<> | 144:ef7eb2e8f9f7 | 978 | } else { |
<> | 144:ef7eb2e8f9f7 | 979 | txDescrCfg.srcInc = dmaDataInc1; |
<> | 144:ef7eb2e8f9f7 | 980 | } |
<> | 144:ef7eb2e8f9f7 | 981 | } |
<> | 144:ef7eb2e8f9f7 | 982 | txDescrCfg.size = (obj->spi.bits <= 8 ? dmaDataSize1 : dmaDataSize2); //When frame size >= 9, use TXDOUBLE |
<> | 144:ef7eb2e8f9f7 | 983 | txDescrCfg.arbRate = dmaArbitrate1; |
<> | 144:ef7eb2e8f9f7 | 984 | txDescrCfg.hprot = 0; |
<> | 144:ef7eb2e8f9f7 | 985 | DMA_CfgDescr(obj->spi.dmaOptionsTX.dmaChannel, true, &txDescrCfg); |
<> | 144:ef7eb2e8f9f7 | 986 | |
<> | 144:ef7eb2e8f9f7 | 987 | void * tx_reg; |
<> | 144:ef7eb2e8f9f7 | 988 | if (obj->spi.bits > 9) { |
<> | 144:ef7eb2e8f9f7 | 989 | tx_reg = (void *)&obj->spi.spi->TXDOUBLE; |
<> | 144:ef7eb2e8f9f7 | 990 | } else if (obj->spi.bits == 9) { |
<> | 144:ef7eb2e8f9f7 | 991 | tx_reg = (void *)&obj->spi.spi->TXDATAX; |
<> | 144:ef7eb2e8f9f7 | 992 | } else { |
<> | 144:ef7eb2e8f9f7 | 993 | tx_reg = (void *)&obj->spi.spi->TXDATA; |
<> | 144:ef7eb2e8f9f7 | 994 | } |
<> | 144:ef7eb2e8f9f7 | 995 | |
<> | 144:ef7eb2e8f9f7 | 996 | /* Activate TX channel */ |
<> | 144:ef7eb2e8f9f7 | 997 | DMA_ActivateBasic(obj->spi.dmaOptionsTX.dmaChannel, |
<> | 144:ef7eb2e8f9f7 | 998 | true, |
<> | 144:ef7eb2e8f9f7 | 999 | false, |
<> | 144:ef7eb2e8f9f7 | 1000 | tx_reg, |
<> | 144:ef7eb2e8f9f7 | 1001 | (txdata == 0 ? &fill_word : (void *)txdata), // When there is nothing to transmit, point to static fill word |
<> | 144:ef7eb2e8f9f7 | 1002 | (tx_length - 1)); |
<> | 144:ef7eb2e8f9f7 | 1003 | } |
<> | 144:ef7eb2e8f9f7 | 1004 | #endif //LDMA_PRESENT |
<> | 144:ef7eb2e8f9f7 | 1005 | /******************************************************************** |
<> | 144:ef7eb2e8f9f7 | 1006 | * spi_master_transfer_dma(spi_t *obj, void *rxdata, void *txdata, int length, DMACallback cb, DMAUsage hint) |
<> | 144:ef7eb2e8f9f7 | 1007 | * |
<> | 144:ef7eb2e8f9f7 | 1008 | * Start an SPI transfer by using DMA and the supplied hint for DMA useage |
<> | 144:ef7eb2e8f9f7 | 1009 | * |
<> | 144:ef7eb2e8f9f7 | 1010 | * * obj: pointer to specific SPI instance |
<> | 144:ef7eb2e8f9f7 | 1011 | * * rxdata: pointer to rx buffer. If null, we will assume only TX is relevant, and RX will be ignored. |
<> | 144:ef7eb2e8f9f7 | 1012 | * * txdata: pointer to TX buffer. If null, we will assume only the read is relevant, and will send FF's for reading back. |
<> | 144:ef7eb2e8f9f7 | 1013 | * * length: How many bytes should be written/read. |
<> | 144:ef7eb2e8f9f7 | 1014 | * * cb: thunk pointer into CPP-land to get the spi object |
<> | 144:ef7eb2e8f9f7 | 1015 | * * hint: hint for the requested DMA useage. |
<> | 144:ef7eb2e8f9f7 | 1016 | * * NEVER: do not use DMA, but use IRQ instead |
<> | 144:ef7eb2e8f9f7 | 1017 | * * OPPORTUNISTIC: use DMA if there are channels available, but return them after the transfer. |
<> | 144:ef7eb2e8f9f7 | 1018 | * * ALWAYS: use DMA if channels are available, and hold on to the channels after the transfer. |
<> | 144:ef7eb2e8f9f7 | 1019 | * If the previous transfer has kept the channel, that channel will continue to get used. |
<> | 144:ef7eb2e8f9f7 | 1020 | * |
<> | 144:ef7eb2e8f9f7 | 1021 | ********************************************************************/ |
<> | 144:ef7eb2e8f9f7 | 1022 | void spi_master_transfer_dma(spi_t *obj, const void *txdata, void *rxdata, int tx_length, int rx_length, void* cb, DMAUsage hint) |
<> | 144:ef7eb2e8f9f7 | 1023 | { |
<> | 144:ef7eb2e8f9f7 | 1024 | /* Init DMA here to include it in the power figure */ |
<> | 144:ef7eb2e8f9f7 | 1025 | dma_init(); |
<> | 144:ef7eb2e8f9f7 | 1026 | /* Clear TX and RX registers */ |
<> | 144:ef7eb2e8f9f7 | 1027 | obj->spi.spi->CMD = USART_CMD_CLEARTX; |
<> | 144:ef7eb2e8f9f7 | 1028 | obj->spi.spi->CMD = USART_CMD_CLEARRX; |
<> | 144:ef7eb2e8f9f7 | 1029 | /* If the DMA channels are already allocated, we can assume they have been setup already */ |
<> | 144:ef7eb2e8f9f7 | 1030 | if (hint != DMA_USAGE_NEVER && obj->spi.dmaOptionsTX.dmaUsageState == DMA_USAGE_ALLOCATED) { |
<> | 144:ef7eb2e8f9f7 | 1031 | /* setup has already been done, so just activate the transfer */ |
<> | 144:ef7eb2e8f9f7 | 1032 | spi_activate_dma(obj, rxdata, txdata, tx_length, rx_length); |
<> | 144:ef7eb2e8f9f7 | 1033 | } else if (hint == DMA_USAGE_NEVER) { |
<> | 144:ef7eb2e8f9f7 | 1034 | /* use IRQ */ |
<> | 144:ef7eb2e8f9f7 | 1035 | obj->spi.spi->IFC = 0xFFFFFFFF; |
<> | 144:ef7eb2e8f9f7 | 1036 | spi_master_write_asynch(obj); |
<> | 144:ef7eb2e8f9f7 | 1037 | spi_enable_interrupt(obj, (uint32_t)cb, true); |
<> | 144:ef7eb2e8f9f7 | 1038 | } else { |
<> | 144:ef7eb2e8f9f7 | 1039 | /* try to acquire channels */ |
<> | 144:ef7eb2e8f9f7 | 1040 | dma_init(); |
<> | 144:ef7eb2e8f9f7 | 1041 | spi_enable_dma(obj, hint); |
<> | 144:ef7eb2e8f9f7 | 1042 | |
<> | 144:ef7eb2e8f9f7 | 1043 | /* decide between DMA and IRQ */ |
<> | 144:ef7eb2e8f9f7 | 1044 | if (obj->spi.dmaOptionsTX.dmaUsageState == DMA_USAGE_ALLOCATED || obj->spi.dmaOptionsTX.dmaUsageState == DMA_USAGE_TEMPORARY_ALLOCATED) { |
<> | 144:ef7eb2e8f9f7 | 1045 | /* disable the interrupts that may have been left open previously */ |
<> | 144:ef7eb2e8f9f7 | 1046 | spi_enable_interrupt(obj, (uint32_t)cb, false); |
<> | 144:ef7eb2e8f9f7 | 1047 | |
<> | 144:ef7eb2e8f9f7 | 1048 | /* DMA channels are allocated, so do their setup */ |
<> | 144:ef7eb2e8f9f7 | 1049 | spi_master_dma_channel_setup(obj, cb); |
<> | 144:ef7eb2e8f9f7 | 1050 | /* and activate the transfer */ |
<> | 144:ef7eb2e8f9f7 | 1051 | spi_activate_dma(obj, rxdata, txdata, tx_length, rx_length); |
<> | 144:ef7eb2e8f9f7 | 1052 | } else { |
<> | 144:ef7eb2e8f9f7 | 1053 | /* DMA is unavailable, so fall back to IRQ */ |
<> | 144:ef7eb2e8f9f7 | 1054 | obj->spi.spi->IFC = 0xFFFFFFFF; |
<> | 144:ef7eb2e8f9f7 | 1055 | spi_master_write_asynch(obj); |
<> | 144:ef7eb2e8f9f7 | 1056 | spi_enable_interrupt(obj, (uint32_t)cb, true); |
<> | 144:ef7eb2e8f9f7 | 1057 | } |
<> | 144:ef7eb2e8f9f7 | 1058 | } |
<> | 144:ef7eb2e8f9f7 | 1059 | } |
<> | 144:ef7eb2e8f9f7 | 1060 | |
<> | 144:ef7eb2e8f9f7 | 1061 | /** Begin the SPI transfer. Buffer pointers and lengths are specified in tx_buff and rx_buff |
<> | 144:ef7eb2e8f9f7 | 1062 | * |
<> | 144:ef7eb2e8f9f7 | 1063 | * @param[in] obj The SPI object which holds the transfer information |
<> | 144:ef7eb2e8f9f7 | 1064 | * @param[in] tx The buffer to send |
<> | 144:ef7eb2e8f9f7 | 1065 | * @param[in] tx_length The number of words to transmit |
<> | 144:ef7eb2e8f9f7 | 1066 | * @param[in] rx The buffer to receive |
<> | 144:ef7eb2e8f9f7 | 1067 | * @param[in] rx_length The number of words to receive |
<> | 144:ef7eb2e8f9f7 | 1068 | * @param[in] bit_width The bit width of buffer words |
<> | 144:ef7eb2e8f9f7 | 1069 | * @param[in] event The logical OR of events to be registered |
<> | 144:ef7eb2e8f9f7 | 1070 | * @param[in] handler SPI interrupt handler |
<> | 144:ef7eb2e8f9f7 | 1071 | * @param[in] hint A suggestion for how to use DMA with this transfer |
<> | 144:ef7eb2e8f9f7 | 1072 | */ |
<> | 144:ef7eb2e8f9f7 | 1073 | void spi_master_transfer(spi_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length, uint8_t bit_width, uint32_t handler, uint32_t event, DMAUsage hint) |
<> | 144:ef7eb2e8f9f7 | 1074 | { |
<> | 144:ef7eb2e8f9f7 | 1075 | if( spi_active(obj) ) return; |
<> | 144:ef7eb2e8f9f7 | 1076 | |
<> | 144:ef7eb2e8f9f7 | 1077 | /* update fill word if on 9-bit frame size */ |
<> | 144:ef7eb2e8f9f7 | 1078 | if(obj->spi.bits == 9) fill_word = SPI_FILL_WORD & 0x1FF; |
<> | 144:ef7eb2e8f9f7 | 1079 | else fill_word = SPI_FILL_WORD; |
<> | 144:ef7eb2e8f9f7 | 1080 | |
<> | 144:ef7eb2e8f9f7 | 1081 | /* check corner case */ |
<> | 144:ef7eb2e8f9f7 | 1082 | if(tx_length == 0) { |
<> | 144:ef7eb2e8f9f7 | 1083 | tx_length = rx_length; |
<> | 144:ef7eb2e8f9f7 | 1084 | tx = (void*) 0; |
<> | 144:ef7eb2e8f9f7 | 1085 | } |
<> | 144:ef7eb2e8f9f7 | 1086 | |
<> | 144:ef7eb2e8f9f7 | 1087 | /* First, set the buffer */ |
<> | 144:ef7eb2e8f9f7 | 1088 | spi_buffer_set(obj, tx, tx_length, rx, rx_length, bit_width); |
<> | 144:ef7eb2e8f9f7 | 1089 | |
<> | 144:ef7eb2e8f9f7 | 1090 | /* Then, enable the events */ |
<> | 144:ef7eb2e8f9f7 | 1091 | spi_enable_event(obj, SPI_EVENT_ALL, false); |
<> | 144:ef7eb2e8f9f7 | 1092 | spi_enable_event(obj, event, true); |
<> | 144:ef7eb2e8f9f7 | 1093 | |
<> | 144:ef7eb2e8f9f7 | 1094 | // Set the sleep mode |
<> | 144:ef7eb2e8f9f7 | 1095 | blockSleepMode(SPI_LEAST_ACTIVE_SLEEPMODE); |
<> | 144:ef7eb2e8f9f7 | 1096 | |
<> | 144:ef7eb2e8f9f7 | 1097 | /* And kick off the transfer */ |
<> | 144:ef7eb2e8f9f7 | 1098 | spi_master_transfer_dma(obj, tx, rx, tx_length, rx_length, (void*)handler, hint); |
<> | 144:ef7eb2e8f9f7 | 1099 | } |
<> | 144:ef7eb2e8f9f7 | 1100 | |
<> | 144:ef7eb2e8f9f7 | 1101 | |
<> | 144:ef7eb2e8f9f7 | 1102 | /******************************************************************** |
<> | 144:ef7eb2e8f9f7 | 1103 | * uint32_t spi_irq_handler_generic(spi_t* obj) |
<> | 144:ef7eb2e8f9f7 | 1104 | * |
<> | 144:ef7eb2e8f9f7 | 1105 | * handler which should get called by CPP-land when either a DMA or SPI IRQ gets fired for a SPI transaction. |
<> | 144:ef7eb2e8f9f7 | 1106 | * |
<> | 144:ef7eb2e8f9f7 | 1107 | * * obj: pointer to the specific SPI instance |
<> | 144:ef7eb2e8f9f7 | 1108 | * |
<> | 144:ef7eb2e8f9f7 | 1109 | * return: event mask. Currently only 0 or SPI_EVENT_COMPLETE upon transfer completion. |
<> | 144:ef7eb2e8f9f7 | 1110 | * |
<> | 144:ef7eb2e8f9f7 | 1111 | ********************************************************************/ |
<> | 144:ef7eb2e8f9f7 | 1112 | #ifdef LDMA_PRESENT |
<> | 144:ef7eb2e8f9f7 | 1113 | uint32_t spi_irq_handler_asynch(spi_t* obj) |
<> | 144:ef7eb2e8f9f7 | 1114 | { |
<> | 144:ef7eb2e8f9f7 | 1115 | if (obj->spi.dmaOptionsTX.dmaUsageState == DMA_USAGE_ALLOCATED || obj->spi.dmaOptionsTX.dmaUsageState == DMA_USAGE_TEMPORARY_ALLOCATED) { |
<> | 144:ef7eb2e8f9f7 | 1116 | /* DMA implementation */ |
<> | 144:ef7eb2e8f9f7 | 1117 | /* If there is still data in the TX buffer, setup a new transfer. */ |
<> | 144:ef7eb2e8f9f7 | 1118 | if (obj->tx_buff.pos < obj->tx_buff.length) { |
<> | 144:ef7eb2e8f9f7 | 1119 | /* Find position and remaining length without modifying tx_buff. */ |
<> | 144:ef7eb2e8f9f7 | 1120 | void* tx_pointer = (char*)obj->tx_buff.buffer + obj->tx_buff.pos; |
<> | 144:ef7eb2e8f9f7 | 1121 | uint32_t tx_length = obj->tx_buff.length - obj->tx_buff.pos; |
<> | 144:ef7eb2e8f9f7 | 1122 | |
<> | 144:ef7eb2e8f9f7 | 1123 | /* Begin transfer. Rely on spi_activate_dma to split up the transfer further. */ |
<> | 144:ef7eb2e8f9f7 | 1124 | spi_activate_dma(obj, obj->rx_buff.buffer, tx_pointer, tx_length, obj->rx_buff.length); |
<> | 144:ef7eb2e8f9f7 | 1125 | |
<> | 144:ef7eb2e8f9f7 | 1126 | return 0; |
<> | 144:ef7eb2e8f9f7 | 1127 | } |
<> | 144:ef7eb2e8f9f7 | 1128 | /* If there is an RX transfer ongoing, wait for it to finish */ |
<> | 144:ef7eb2e8f9f7 | 1129 | if (LDMAx_ChannelEnabled(obj->spi.dmaOptionsRX.dmaChannel)) { |
<> | 144:ef7eb2e8f9f7 | 1130 | /* Check if we need to kick off TX transfer again to force more incoming data. */ |
<> | 144:ef7eb2e8f9f7 | 1131 | if (LDMA_TransferDone(obj->spi.dmaOptionsTX.dmaChannel) && (obj->tx_buff.pos < obj->rx_buff.length)) { |
<> | 144:ef7eb2e8f9f7 | 1132 | void* tx_pointer = (char*)obj->tx_buff.buffer + obj->tx_buff.pos; |
<> | 144:ef7eb2e8f9f7 | 1133 | uint32_t tx_length = obj->tx_buff.length - obj->tx_buff.pos; |
<> | 144:ef7eb2e8f9f7 | 1134 | /* Begin transfer. Rely on spi_activate_dma to split up the transfer further. */ |
<> | 144:ef7eb2e8f9f7 | 1135 | spi_activate_dma(obj, obj->rx_buff.buffer, tx_pointer, tx_length, obj->rx_buff.length); |
<> | 144:ef7eb2e8f9f7 | 1136 | } else return 0; |
<> | 144:ef7eb2e8f9f7 | 1137 | } |
<> | 144:ef7eb2e8f9f7 | 1138 | /* If there is still a TX transfer ongoing (tx_length > rx_length), wait for it to finish */ |
<> | 144:ef7eb2e8f9f7 | 1139 | if (!LDMA_TransferDone(obj->spi.dmaOptionsTX.dmaChannel)) { |
<> | 144:ef7eb2e8f9f7 | 1140 | return 0; |
<> | 144:ef7eb2e8f9f7 | 1141 | } |
<> | 144:ef7eb2e8f9f7 | 1142 | /* Release the dma channels if they were opportunistically allocated */ |
<> | 144:ef7eb2e8f9f7 | 1143 | if (obj->spi.dmaOptionsTX.dmaUsageState == DMA_USAGE_TEMPORARY_ALLOCATED) { |
<> | 144:ef7eb2e8f9f7 | 1144 | dma_channel_free(obj->spi.dmaOptionsTX.dmaChannel); |
<> | 144:ef7eb2e8f9f7 | 1145 | dma_channel_free(obj->spi.dmaOptionsRX.dmaChannel); |
<> | 144:ef7eb2e8f9f7 | 1146 | obj->spi.dmaOptionsTX.dmaUsageState = DMA_USAGE_OPPORTUNISTIC; |
<> | 144:ef7eb2e8f9f7 | 1147 | } |
<> | 144:ef7eb2e8f9f7 | 1148 | |
<> | 144:ef7eb2e8f9f7 | 1149 | /* Wait transmit to complete, before user code is indicated*/ |
<> | 144:ef7eb2e8f9f7 | 1150 | while(!(obj->spi.spi->STATUS & USART_STATUS_TXC)); |
<> | 144:ef7eb2e8f9f7 | 1151 | unblockSleepMode(SPI_LEAST_ACTIVE_SLEEPMODE); |
<> | 144:ef7eb2e8f9f7 | 1152 | /* return to CPP land to say we're finished */ |
<> | 144:ef7eb2e8f9f7 | 1153 | return SPI_EVENT_COMPLETE; |
<> | 144:ef7eb2e8f9f7 | 1154 | } else { |
<> | 144:ef7eb2e8f9f7 | 1155 | /* IRQ implementation */ |
<> | 144:ef7eb2e8f9f7 | 1156 | if (spi_master_rx_int_flag(obj)) { |
<> | 144:ef7eb2e8f9f7 | 1157 | spi_master_read_asynch(obj); |
<> | 144:ef7eb2e8f9f7 | 1158 | } |
<> | 144:ef7eb2e8f9f7 | 1159 | |
<> | 144:ef7eb2e8f9f7 | 1160 | if (spi_master_tx_int_flag(obj)) { |
<> | 144:ef7eb2e8f9f7 | 1161 | spi_master_write_asynch(obj); |
<> | 144:ef7eb2e8f9f7 | 1162 | } |
<> | 144:ef7eb2e8f9f7 | 1163 | |
<> | 144:ef7eb2e8f9f7 | 1164 | uint32_t event = spi_event_check(obj); |
<> | 144:ef7eb2e8f9f7 | 1165 | if (event & SPI_EVENT_INTERNAL_TRANSFER_COMPLETE) { |
<> | 144:ef7eb2e8f9f7 | 1166 | /* disable interrupts */ |
<> | 144:ef7eb2e8f9f7 | 1167 | spi_enable_interrupt(obj, (uint32_t)NULL, false); |
<> | 144:ef7eb2e8f9f7 | 1168 | |
<> | 144:ef7eb2e8f9f7 | 1169 | unblockSleepMode(SPI_LEAST_ACTIVE_SLEEPMODE); |
<> | 144:ef7eb2e8f9f7 | 1170 | /* Return the event back to userland */ |
<> | 144:ef7eb2e8f9f7 | 1171 | return event; |
<> | 144:ef7eb2e8f9f7 | 1172 | } |
<> | 144:ef7eb2e8f9f7 | 1173 | |
<> | 144:ef7eb2e8f9f7 | 1174 | return 0; |
<> | 144:ef7eb2e8f9f7 | 1175 | } |
<> | 144:ef7eb2e8f9f7 | 1176 | } |
<> | 144:ef7eb2e8f9f7 | 1177 | #else |
<> | 144:ef7eb2e8f9f7 | 1178 | uint32_t spi_irq_handler_asynch(spi_t* obj) |
<> | 144:ef7eb2e8f9f7 | 1179 | { |
<> | 144:ef7eb2e8f9f7 | 1180 | |
<> | 144:ef7eb2e8f9f7 | 1181 | /* Determine whether the current scenario is DMA or IRQ, and act accordingly */ |
<> | 144:ef7eb2e8f9f7 | 1182 | |
<> | 144:ef7eb2e8f9f7 | 1183 | if (obj->spi.dmaOptionsTX.dmaUsageState == DMA_USAGE_ALLOCATED || obj->spi.dmaOptionsTX.dmaUsageState == DMA_USAGE_TEMPORARY_ALLOCATED) { |
<> | 144:ef7eb2e8f9f7 | 1184 | /* DMA implementation */ |
<> | 144:ef7eb2e8f9f7 | 1185 | |
<> | 144:ef7eb2e8f9f7 | 1186 | /* If there is still data in the TX buffer, setup a new transfer. */ |
<> | 144:ef7eb2e8f9f7 | 1187 | if (obj->tx_buff.pos < obj->tx_buff.length) { |
<> | 144:ef7eb2e8f9f7 | 1188 | /* If there is still a TX transfer ongoing, let it finish |
<> | 144:ef7eb2e8f9f7 | 1189 | * before (if necessary) kicking off a new transfer */ |
<> | 144:ef7eb2e8f9f7 | 1190 | if (DMA_ChannelEnabled(obj->spi.dmaOptionsTX.dmaChannel)) { |
<> | 144:ef7eb2e8f9f7 | 1191 | return 0; |
<> | 144:ef7eb2e8f9f7 | 1192 | } |
<> | 144:ef7eb2e8f9f7 | 1193 | /* Find position and remaining length without modifying tx_buff. */ |
<> | 144:ef7eb2e8f9f7 | 1194 | void * tx_pointer; |
<> | 144:ef7eb2e8f9f7 | 1195 | if (obj->tx_buff.width == 32) { |
<> | 144:ef7eb2e8f9f7 | 1196 | tx_pointer = ((uint32_t *)obj->tx_buff.buffer) + obj->tx_buff.pos; |
<> | 144:ef7eb2e8f9f7 | 1197 | } else if (obj->tx_buff.width == 16) { |
<> | 144:ef7eb2e8f9f7 | 1198 | tx_pointer = ((uint16_t *)obj->tx_buff.buffer) + obj->tx_buff.pos; |
<> | 144:ef7eb2e8f9f7 | 1199 | } else { |
<> | 144:ef7eb2e8f9f7 | 1200 | tx_pointer = ((uint8_t *)obj->tx_buff.buffer) + obj->tx_buff.pos; |
<> | 144:ef7eb2e8f9f7 | 1201 | } |
<> | 144:ef7eb2e8f9f7 | 1202 | uint32_t tx_length = obj->tx_buff.length - obj->tx_buff.pos; |
<> | 144:ef7eb2e8f9f7 | 1203 | |
<> | 144:ef7eb2e8f9f7 | 1204 | /* Refresh RX transfer too if it exists */ |
<> | 144:ef7eb2e8f9f7 | 1205 | void * rx_pointer = NULL; |
<> | 144:ef7eb2e8f9f7 | 1206 | if (obj->rx_buff.pos < obj->rx_buff.length) { |
<> | 144:ef7eb2e8f9f7 | 1207 | if (obj->rx_buff.width == 32) { |
<> | 144:ef7eb2e8f9f7 | 1208 | rx_pointer = ((uint32_t *)obj->rx_buff.buffer) + obj->rx_buff.pos; |
<> | 144:ef7eb2e8f9f7 | 1209 | } else if (obj->rx_buff.width == 16) { |
<> | 144:ef7eb2e8f9f7 | 1210 | rx_pointer = ((uint16_t *)obj->rx_buff.buffer) + obj->rx_buff.pos; |
<> | 144:ef7eb2e8f9f7 | 1211 | } else { |
<> | 144:ef7eb2e8f9f7 | 1212 | rx_pointer = ((uint8_t *)obj->rx_buff.buffer) + obj->rx_buff.pos; |
<> | 144:ef7eb2e8f9f7 | 1213 | } |
<> | 144:ef7eb2e8f9f7 | 1214 | } |
<> | 144:ef7eb2e8f9f7 | 1215 | uint32_t rx_length = obj->rx_buff.length - obj->rx_buff.pos; |
<> | 144:ef7eb2e8f9f7 | 1216 | |
<> | 144:ef7eb2e8f9f7 | 1217 | /* Wait for the previous transfer to complete. */ |
<> | 144:ef7eb2e8f9f7 | 1218 | while(!(obj->spi.spi->STATUS & USART_STATUS_TXC)); |
<> | 144:ef7eb2e8f9f7 | 1219 | |
<> | 144:ef7eb2e8f9f7 | 1220 | /* Begin transfer. Rely on spi_activate_dma to split up the transfer further. */ |
<> | 144:ef7eb2e8f9f7 | 1221 | spi_activate_dma(obj, rx_pointer, tx_pointer, tx_length, rx_length); |
<> | 144:ef7eb2e8f9f7 | 1222 | |
<> | 144:ef7eb2e8f9f7 | 1223 | return 0; |
<> | 144:ef7eb2e8f9f7 | 1224 | } |
<> | 144:ef7eb2e8f9f7 | 1225 | |
<> | 144:ef7eb2e8f9f7 | 1226 | /* If an RX transfer is ongoing, continue processing RX data */ |
<> | 144:ef7eb2e8f9f7 | 1227 | if (DMA_ChannelEnabled(obj->spi.dmaOptionsRX.dmaChannel)) { |
<> | 144:ef7eb2e8f9f7 | 1228 | /* Check if we need to kick off TX transfer again to force more incoming data. */ |
<> | 144:ef7eb2e8f9f7 | 1229 | if (!DMA_ChannelEnabled(obj->spi.dmaOptionsTX.dmaChannel) && (obj->rx_buff.pos < obj->rx_buff.length)) { |
<> | 144:ef7eb2e8f9f7 | 1230 | //Save state of TX transfer amount |
<> | 144:ef7eb2e8f9f7 | 1231 | int length_diff = obj->rx_buff.length - obj->rx_buff.pos; |
<> | 144:ef7eb2e8f9f7 | 1232 | obj->tx_buff.pos = obj->rx_buff.length; |
<> | 144:ef7eb2e8f9f7 | 1233 | |
<> | 144:ef7eb2e8f9f7 | 1234 | //Kick off a new DMA transfer |
<> | 144:ef7eb2e8f9f7 | 1235 | DMA_CfgDescr_TypeDef txDescrCfg; |
<> | 144:ef7eb2e8f9f7 | 1236 | |
<> | 144:ef7eb2e8f9f7 | 1237 | fill_word = SPI_FILL_WORD; |
<> | 144:ef7eb2e8f9f7 | 1238 | /* Setting up channel descriptor */ |
<> | 144:ef7eb2e8f9f7 | 1239 | txDescrCfg.dstInc = dmaDataIncNone; |
<> | 144:ef7eb2e8f9f7 | 1240 | txDescrCfg.srcInc = dmaDataIncNone; //Do not increment source pointer when there is no transmit buffer |
<> | 144:ef7eb2e8f9f7 | 1241 | txDescrCfg.size = (obj->spi.bits <= 8 ? dmaDataSize1 : dmaDataSize2); //When frame size > 9, we can use TXDOUBLE to save bandwidth |
<> | 144:ef7eb2e8f9f7 | 1242 | txDescrCfg.arbRate = dmaArbitrate1; |
<> | 144:ef7eb2e8f9f7 | 1243 | txDescrCfg.hprot = 0; |
<> | 144:ef7eb2e8f9f7 | 1244 | DMA_CfgDescr(obj->spi.dmaOptionsTX.dmaChannel, true, &txDescrCfg); |
<> | 144:ef7eb2e8f9f7 | 1245 | |
<> | 144:ef7eb2e8f9f7 | 1246 | void * tx_reg; |
<> | 144:ef7eb2e8f9f7 | 1247 | if (obj->spi.bits > 9) { |
<> | 144:ef7eb2e8f9f7 | 1248 | tx_reg = (void *)&obj->spi.spi->TXDOUBLE; |
<> | 144:ef7eb2e8f9f7 | 1249 | } else if (obj->spi.bits == 9) { |
<> | 144:ef7eb2e8f9f7 | 1250 | tx_reg = (void *)&obj->spi.spi->TXDATAX; |
<> | 144:ef7eb2e8f9f7 | 1251 | } else { |
<> | 144:ef7eb2e8f9f7 | 1252 | tx_reg = (void *)&obj->spi.spi->TXDATA; |
<> | 144:ef7eb2e8f9f7 | 1253 | } |
<> | 144:ef7eb2e8f9f7 | 1254 | |
<> | 144:ef7eb2e8f9f7 | 1255 | /* Activate TX channel */ |
<> | 144:ef7eb2e8f9f7 | 1256 | DMA_ActivateBasic(obj->spi.dmaOptionsTX.dmaChannel, |
<> | 144:ef7eb2e8f9f7 | 1257 | true, |
<> | 144:ef7eb2e8f9f7 | 1258 | false, |
<> | 144:ef7eb2e8f9f7 | 1259 | tx_reg, //When frame size > 9, point to TXDOUBLE |
<> | 144:ef7eb2e8f9f7 | 1260 | &fill_word, // When there is nothing to transmit, point to static fill word |
<> | 144:ef7eb2e8f9f7 | 1261 | length_diff - 1); |
<> | 144:ef7eb2e8f9f7 | 1262 | } else { |
<> | 144:ef7eb2e8f9f7 | 1263 | /* Nothing to do */ |
<> | 144:ef7eb2e8f9f7 | 1264 | return 0; |
<> | 144:ef7eb2e8f9f7 | 1265 | } |
<> | 144:ef7eb2e8f9f7 | 1266 | } |
<> | 144:ef7eb2e8f9f7 | 1267 | |
<> | 144:ef7eb2e8f9f7 | 1268 | /* Release the dma channels if they were opportunistically allocated */ |
<> | 144:ef7eb2e8f9f7 | 1269 | if (obj->spi.dmaOptionsTX.dmaUsageState == DMA_USAGE_TEMPORARY_ALLOCATED) { |
<> | 144:ef7eb2e8f9f7 | 1270 | dma_channel_free(obj->spi.dmaOptionsTX.dmaChannel); |
<> | 144:ef7eb2e8f9f7 | 1271 | dma_channel_free(obj->spi.dmaOptionsRX.dmaChannel); |
<> | 144:ef7eb2e8f9f7 | 1272 | obj->spi.dmaOptionsTX.dmaUsageState = DMA_USAGE_OPPORTUNISTIC; |
<> | 144:ef7eb2e8f9f7 | 1273 | } |
<> | 144:ef7eb2e8f9f7 | 1274 | |
<> | 144:ef7eb2e8f9f7 | 1275 | /* Wait for transmit to complete, before user code is indicated */ |
<> | 144:ef7eb2e8f9f7 | 1276 | while(!(obj->spi.spi->STATUS & USART_STATUS_TXC)); |
<> | 144:ef7eb2e8f9f7 | 1277 | unblockSleepMode(SPI_LEAST_ACTIVE_SLEEPMODE); |
<> | 144:ef7eb2e8f9f7 | 1278 | |
<> | 144:ef7eb2e8f9f7 | 1279 | /* return to CPP land to say we're finished */ |
<> | 144:ef7eb2e8f9f7 | 1280 | return SPI_EVENT_COMPLETE; |
<> | 144:ef7eb2e8f9f7 | 1281 | } else { |
<> | 144:ef7eb2e8f9f7 | 1282 | /* IRQ implementation */ |
<> | 144:ef7eb2e8f9f7 | 1283 | if (spi_master_rx_int_flag(obj)) { |
<> | 144:ef7eb2e8f9f7 | 1284 | spi_master_read_asynch(obj); |
<> | 144:ef7eb2e8f9f7 | 1285 | } |
<> | 144:ef7eb2e8f9f7 | 1286 | |
<> | 144:ef7eb2e8f9f7 | 1287 | if (spi_master_tx_int_flag(obj)) { |
<> | 144:ef7eb2e8f9f7 | 1288 | spi_master_write_asynch(obj); |
<> | 144:ef7eb2e8f9f7 | 1289 | } |
<> | 144:ef7eb2e8f9f7 | 1290 | |
<> | 144:ef7eb2e8f9f7 | 1291 | uint32_t event = spi_event_check(obj); |
<> | 144:ef7eb2e8f9f7 | 1292 | if (event & SPI_EVENT_INTERNAL_TRANSFER_COMPLETE) { |
<> | 144:ef7eb2e8f9f7 | 1293 | /* disable interrupts */ |
<> | 144:ef7eb2e8f9f7 | 1294 | spi_enable_interrupt(obj, (uint32_t)NULL, false); |
<> | 144:ef7eb2e8f9f7 | 1295 | |
<> | 144:ef7eb2e8f9f7 | 1296 | /* Wait for transmit to complete, before user code is indicated */ |
<> | 144:ef7eb2e8f9f7 | 1297 | while(!(obj->spi.spi->STATUS & USART_STATUS_TXC)); |
<> | 144:ef7eb2e8f9f7 | 1298 | unblockSleepMode(SPI_LEAST_ACTIVE_SLEEPMODE); |
<> | 144:ef7eb2e8f9f7 | 1299 | |
<> | 144:ef7eb2e8f9f7 | 1300 | /* Return the event back to userland */ |
<> | 144:ef7eb2e8f9f7 | 1301 | return event; |
<> | 144:ef7eb2e8f9f7 | 1302 | } |
<> | 144:ef7eb2e8f9f7 | 1303 | |
<> | 144:ef7eb2e8f9f7 | 1304 | return 0; |
<> | 144:ef7eb2e8f9f7 | 1305 | } |
<> | 144:ef7eb2e8f9f7 | 1306 | } |
<> | 144:ef7eb2e8f9f7 | 1307 | #endif // LDMA_PRESENT |
<> | 144:ef7eb2e8f9f7 | 1308 | /** Abort an SPI transfer |
<> | 144:ef7eb2e8f9f7 | 1309 | * |
<> | 144:ef7eb2e8f9f7 | 1310 | * @param obj The SPI peripheral to stop |
<> | 144:ef7eb2e8f9f7 | 1311 | */ |
<> | 144:ef7eb2e8f9f7 | 1312 | void spi_abort_asynch(spi_t *obj) |
<> | 144:ef7eb2e8f9f7 | 1313 | { |
<> | 144:ef7eb2e8f9f7 | 1314 | // If we're not currently transferring, then there's nothing to do here |
<> | 144:ef7eb2e8f9f7 | 1315 | if(spi_active(obj) != 0) return; |
<> | 144:ef7eb2e8f9f7 | 1316 | |
<> | 144:ef7eb2e8f9f7 | 1317 | // Determine whether we're running DMA or interrupt |
<> | 144:ef7eb2e8f9f7 | 1318 | if (obj->spi.dmaOptionsTX.dmaUsageState == DMA_USAGE_ALLOCATED || obj->spi.dmaOptionsTX.dmaUsageState == DMA_USAGE_TEMPORARY_ALLOCATED) { |
<> | 144:ef7eb2e8f9f7 | 1319 | // Cancel the DMA transfers |
<> | 144:ef7eb2e8f9f7 | 1320 | #ifdef LDMA_PRESENT |
<> | 144:ef7eb2e8f9f7 | 1321 | LDMA_StopTransfer(obj->spi.dmaOptionsTX.dmaChannel); |
<> | 144:ef7eb2e8f9f7 | 1322 | LDMA_StopTransfer(obj->spi.dmaOptionsRX.dmaChannel); |
<> | 144:ef7eb2e8f9f7 | 1323 | #else |
<> | 144:ef7eb2e8f9f7 | 1324 | DMA_ChannelEnable(obj->spi.dmaOptionsTX.dmaChannel, false); |
<> | 144:ef7eb2e8f9f7 | 1325 | DMA_ChannelEnable(obj->spi.dmaOptionsRX.dmaChannel, false); |
<> | 144:ef7eb2e8f9f7 | 1326 | #endif |
<> | 144:ef7eb2e8f9f7 | 1327 | /* Release the dma channels if they were opportunistically allocated */ |
<> | 144:ef7eb2e8f9f7 | 1328 | if (obj->spi.dmaOptionsTX.dmaUsageState == DMA_USAGE_TEMPORARY_ALLOCATED) { |
<> | 144:ef7eb2e8f9f7 | 1329 | dma_channel_free(obj->spi.dmaOptionsTX.dmaChannel); |
<> | 144:ef7eb2e8f9f7 | 1330 | dma_channel_free(obj->spi.dmaOptionsRX.dmaChannel); |
<> | 144:ef7eb2e8f9f7 | 1331 | obj->spi.dmaOptionsTX.dmaUsageState = DMA_USAGE_OPPORTUNISTIC; |
<> | 144:ef7eb2e8f9f7 | 1332 | } |
<> | 144:ef7eb2e8f9f7 | 1333 | |
<> | 144:ef7eb2e8f9f7 | 1334 | } else { |
<> | 144:ef7eb2e8f9f7 | 1335 | // Interrupt implementation: switch off interrupts |
<> | 144:ef7eb2e8f9f7 | 1336 | spi_enable_interrupt(obj, (uint32_t)NULL, false); |
<> | 144:ef7eb2e8f9f7 | 1337 | } |
<> | 144:ef7eb2e8f9f7 | 1338 | |
<> | 144:ef7eb2e8f9f7 | 1339 | // Release sleep mode block |
<> | 144:ef7eb2e8f9f7 | 1340 | unblockSleepMode(SPI_LEAST_ACTIVE_SLEEPMODE); |
<> | 144:ef7eb2e8f9f7 | 1341 | } |
<> | 144:ef7eb2e8f9f7 | 1342 | |
<> | 144:ef7eb2e8f9f7 | 1343 | #endif |