mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_DISCO_F051R8/spi_api.c@240:9a7c54113eaf, 2014-06-26 (annotated)
- Committer:
- mbed_official
- Date:
- Thu Jun 26 09:45:08 2014 +0100
- Revision:
- 240:9a7c54113eaf
- Parent:
- 227:7bd0639b8911
Synchronized with git revision 288cce7281f1f4bd5ab515fff36cdf6090bc4480
Full URL: https://github.com/mbedmicro/mbed/commit/288cce7281f1f4bd5ab515fff36cdf6090bc4480/
[DISCO-F051R8] Updated with F030R8 recent changes
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 130:1dec54e4aec3 | 1 | /* mbed Microcontroller Library |
mbed_official | 130:1dec54e4aec3 | 2 | ******************************************************************************* |
mbed_official | 130:1dec54e4aec3 | 3 | * Copyright (c) 2014, STMicroelectronics |
mbed_official | 130:1dec54e4aec3 | 4 | * All rights reserved. |
mbed_official | 130:1dec54e4aec3 | 5 | * |
mbed_official | 130:1dec54e4aec3 | 6 | * Redistribution and use in source and binary forms, with or without |
mbed_official | 130:1dec54e4aec3 | 7 | * modification, are permitted provided that the following conditions are met: |
mbed_official | 130:1dec54e4aec3 | 8 | * |
mbed_official | 130:1dec54e4aec3 | 9 | * 1. Redistributions of source code must retain the above copyright notice, |
mbed_official | 130:1dec54e4aec3 | 10 | * this list of conditions and the following disclaimer. |
mbed_official | 130:1dec54e4aec3 | 11 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
mbed_official | 130:1dec54e4aec3 | 12 | * this list of conditions and the following disclaimer in the documentation |
mbed_official | 130:1dec54e4aec3 | 13 | * and/or other materials provided with the distribution. |
mbed_official | 130:1dec54e4aec3 | 14 | * 3. Neither the name of STMicroelectronics nor the names of its contributors |
mbed_official | 130:1dec54e4aec3 | 15 | * may be used to endorse or promote products derived from this software |
mbed_official | 130:1dec54e4aec3 | 16 | * without specific prior written permission. |
mbed_official | 130:1dec54e4aec3 | 17 | * |
mbed_official | 130:1dec54e4aec3 | 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
mbed_official | 130:1dec54e4aec3 | 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
mbed_official | 130:1dec54e4aec3 | 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
mbed_official | 130:1dec54e4aec3 | 21 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
mbed_official | 130:1dec54e4aec3 | 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
mbed_official | 130:1dec54e4aec3 | 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
mbed_official | 130:1dec54e4aec3 | 24 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
mbed_official | 130:1dec54e4aec3 | 25 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
mbed_official | 130:1dec54e4aec3 | 26 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
mbed_official | 130:1dec54e4aec3 | 27 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
mbed_official | 130:1dec54e4aec3 | 28 | ******************************************************************************* |
mbed_official | 130:1dec54e4aec3 | 29 | */ |
mbed_official | 227:7bd0639b8911 | 30 | #include "mbed_assert.h" |
mbed_official | 130:1dec54e4aec3 | 31 | #include "spi_api.h" |
mbed_official | 130:1dec54e4aec3 | 32 | |
mbed_official | 130:1dec54e4aec3 | 33 | #if DEVICE_SPI |
mbed_official | 130:1dec54e4aec3 | 34 | |
mbed_official | 130:1dec54e4aec3 | 35 | #include <math.h> |
mbed_official | 130:1dec54e4aec3 | 36 | #include "cmsis.h" |
mbed_official | 130:1dec54e4aec3 | 37 | #include "pinmap.h" |
mbed_official | 130:1dec54e4aec3 | 38 | |
mbed_official | 130:1dec54e4aec3 | 39 | static const PinMap PinMap_SPI_MOSI[] = { |
mbed_official | 130:1dec54e4aec3 | 40 | {PA_7, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_0)}, |
mbed_official | 240:9a7c54113eaf | 41 | {PB_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_0)}, |
mbed_official | 240:9a7c54113eaf | 42 | {PB_15, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_0)}, |
mbed_official | 130:1dec54e4aec3 | 43 | {NC, NC, 0} |
mbed_official | 130:1dec54e4aec3 | 44 | }; |
mbed_official | 130:1dec54e4aec3 | 45 | |
mbed_official | 130:1dec54e4aec3 | 46 | static const PinMap PinMap_SPI_MISO[] = { |
mbed_official | 130:1dec54e4aec3 | 47 | {PA_6, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_0)}, |
mbed_official | 240:9a7c54113eaf | 48 | {PB_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_0)}, |
mbed_official | 240:9a7c54113eaf | 49 | {PB_14, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_0)}, |
mbed_official | 130:1dec54e4aec3 | 50 | {NC, NC, 0} |
mbed_official | 130:1dec54e4aec3 | 51 | }; |
mbed_official | 130:1dec54e4aec3 | 52 | |
mbed_official | 130:1dec54e4aec3 | 53 | static const PinMap PinMap_SPI_SCLK[] = { |
mbed_official | 130:1dec54e4aec3 | 54 | {PA_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_0)}, |
mbed_official | 240:9a7c54113eaf | 55 | {PB_3, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_0)}, |
mbed_official | 240:9a7c54113eaf | 56 | {PB_13, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_0)}, |
mbed_official | 130:1dec54e4aec3 | 57 | {NC, NC, 0} |
mbed_official | 130:1dec54e4aec3 | 58 | }; |
mbed_official | 130:1dec54e4aec3 | 59 | |
mbed_official | 130:1dec54e4aec3 | 60 | // Only used in Slave mode |
mbed_official | 130:1dec54e4aec3 | 61 | static const PinMap PinMap_SPI_SSEL[] = { |
mbed_official | 240:9a7c54113eaf | 62 | {PA_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0)}, |
mbed_official | 240:9a7c54113eaf | 63 | {PA_15, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0)}, |
mbed_official | 240:9a7c54113eaf | 64 | {PB_12, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0)}, |
mbed_official | 130:1dec54e4aec3 | 65 | {NC, NC, 0} |
mbed_official | 130:1dec54e4aec3 | 66 | }; |
mbed_official | 130:1dec54e4aec3 | 67 | |
mbed_official | 130:1dec54e4aec3 | 68 | static void init_spi(spi_t *obj) { |
mbed_official | 130:1dec54e4aec3 | 69 | SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); |
mbed_official | 130:1dec54e4aec3 | 70 | SPI_InitTypeDef SPI_InitStructure; |
mbed_official | 130:1dec54e4aec3 | 71 | |
mbed_official | 130:1dec54e4aec3 | 72 | SPI_Cmd(spi, DISABLE); |
mbed_official | 130:1dec54e4aec3 | 73 | |
mbed_official | 130:1dec54e4aec3 | 74 | SPI_InitStructure.SPI_Mode = obj->mode; |
mbed_official | 227:7bd0639b8911 | 75 | SPI_InitStructure.SPI_NSS = obj->nss; |
mbed_official | 227:7bd0639b8911 | 76 | SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; |
mbed_official | 130:1dec54e4aec3 | 77 | SPI_InitStructure.SPI_DataSize = obj->bits; |
mbed_official | 130:1dec54e4aec3 | 78 | SPI_InitStructure.SPI_CPOL = obj->cpol; |
mbed_official | 227:7bd0639b8911 | 79 | SPI_InitStructure.SPI_CPHA = obj->cpha; |
mbed_official | 130:1dec54e4aec3 | 80 | SPI_InitStructure.SPI_BaudRatePrescaler = obj->br_presc; |
mbed_official | 130:1dec54e4aec3 | 81 | SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; |
mbed_official | 130:1dec54e4aec3 | 82 | SPI_InitStructure.SPI_CRCPolynomial = 7; |
mbed_official | 130:1dec54e4aec3 | 83 | SPI_Init(spi, &SPI_InitStructure); |
mbed_official | 130:1dec54e4aec3 | 84 | |
mbed_official | 130:1dec54e4aec3 | 85 | SPI_RxFIFOThresholdConfig(spi, SPI_RxFIFOThreshold_QF); |
mbed_official | 130:1dec54e4aec3 | 86 | |
mbed_official | 130:1dec54e4aec3 | 87 | SPI_Cmd(spi, ENABLE); |
mbed_official | 130:1dec54e4aec3 | 88 | } |
mbed_official | 130:1dec54e4aec3 | 89 | |
mbed_official | 130:1dec54e4aec3 | 90 | void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) { |
mbed_official | 130:1dec54e4aec3 | 91 | // Determine the SPI to use |
mbed_official | 130:1dec54e4aec3 | 92 | SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI); |
mbed_official | 130:1dec54e4aec3 | 93 | SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO); |
mbed_official | 130:1dec54e4aec3 | 94 | SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK); |
mbed_official | 130:1dec54e4aec3 | 95 | SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL); |
mbed_official | 130:1dec54e4aec3 | 96 | |
mbed_official | 130:1dec54e4aec3 | 97 | SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso); |
mbed_official | 130:1dec54e4aec3 | 98 | SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel); |
mbed_official | 130:1dec54e4aec3 | 99 | |
mbed_official | 130:1dec54e4aec3 | 100 | obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl); |
mbed_official | 227:7bd0639b8911 | 101 | MBED_ASSERT(obj->spi != (SPIName)NC); |
mbed_official | 130:1dec54e4aec3 | 102 | |
mbed_official | 130:1dec54e4aec3 | 103 | // Enable SPI clock |
mbed_official | 130:1dec54e4aec3 | 104 | if (obj->spi == SPI_1) { |
mbed_official | 227:7bd0639b8911 | 105 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE); |
mbed_official | 130:1dec54e4aec3 | 106 | } |
mbed_official | 130:1dec54e4aec3 | 107 | if (obj->spi == SPI_2) { |
mbed_official | 227:7bd0639b8911 | 108 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE); |
mbed_official | 130:1dec54e4aec3 | 109 | } |
mbed_official | 130:1dec54e4aec3 | 110 | |
mbed_official | 130:1dec54e4aec3 | 111 | // Configure the SPI pins |
mbed_official | 130:1dec54e4aec3 | 112 | pinmap_pinout(mosi, PinMap_SPI_MOSI); |
mbed_official | 130:1dec54e4aec3 | 113 | pinmap_pinout(miso, PinMap_SPI_MISO); |
mbed_official | 130:1dec54e4aec3 | 114 | pinmap_pinout(sclk, PinMap_SPI_SCLK); |
mbed_official | 130:1dec54e4aec3 | 115 | |
mbed_official | 130:1dec54e4aec3 | 116 | // Save new values |
mbed_official | 130:1dec54e4aec3 | 117 | obj->bits = SPI_DataSize_8b; |
mbed_official | 130:1dec54e4aec3 | 118 | obj->cpol = SPI_CPOL_Low; |
mbed_official | 130:1dec54e4aec3 | 119 | obj->cpha = SPI_CPHA_1Edge; |
mbed_official | 130:1dec54e4aec3 | 120 | obj->br_presc = SPI_BaudRatePrescaler_8; // 1 MHz |
mbed_official | 130:1dec54e4aec3 | 121 | |
mbed_official | 240:9a7c54113eaf | 122 | obj->pin_miso = miso; |
mbed_official | 240:9a7c54113eaf | 123 | obj->pin_mosi = mosi; |
mbed_official | 240:9a7c54113eaf | 124 | obj->pin_sclk = sclk; |
mbed_official | 240:9a7c54113eaf | 125 | obj->pin_ssel = ssel; |
mbed_official | 240:9a7c54113eaf | 126 | |
mbed_official | 130:1dec54e4aec3 | 127 | if (ssel == NC) { // Master |
mbed_official | 130:1dec54e4aec3 | 128 | obj->mode = SPI_Mode_Master; |
mbed_official | 130:1dec54e4aec3 | 129 | obj->nss = SPI_NSS_Soft; |
mbed_official | 240:9a7c54113eaf | 130 | } else { // Slave |
mbed_official | 130:1dec54e4aec3 | 131 | pinmap_pinout(ssel, PinMap_SPI_SSEL); |
mbed_official | 130:1dec54e4aec3 | 132 | obj->mode = SPI_Mode_Slave; |
mbed_official | 240:9a7c54113eaf | 133 | obj->nss = SPI_NSS_Hard; |
mbed_official | 130:1dec54e4aec3 | 134 | } |
mbed_official | 130:1dec54e4aec3 | 135 | |
mbed_official | 130:1dec54e4aec3 | 136 | init_spi(obj); |
mbed_official | 130:1dec54e4aec3 | 137 | } |
mbed_official | 130:1dec54e4aec3 | 138 | |
mbed_official | 130:1dec54e4aec3 | 139 | void spi_free(spi_t *obj) { |
mbed_official | 240:9a7c54113eaf | 140 | // Reset SPI and disable clock |
mbed_official | 240:9a7c54113eaf | 141 | if (obj->spi == SPI_1) { |
mbed_official | 240:9a7c54113eaf | 142 | RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, ENABLE); |
mbed_official | 240:9a7c54113eaf | 143 | RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, DISABLE); |
mbed_official | 240:9a7c54113eaf | 144 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, DISABLE); |
mbed_official | 240:9a7c54113eaf | 145 | } |
mbed_official | 240:9a7c54113eaf | 146 | |
mbed_official | 240:9a7c54113eaf | 147 | if (obj->spi == SPI_2) { |
mbed_official | 240:9a7c54113eaf | 148 | RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, ENABLE); |
mbed_official | 240:9a7c54113eaf | 149 | RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, DISABLE); |
mbed_official | 240:9a7c54113eaf | 150 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, DISABLE); |
mbed_official | 240:9a7c54113eaf | 151 | } |
mbed_official | 240:9a7c54113eaf | 152 | |
mbed_official | 240:9a7c54113eaf | 153 | // Configure GPIOs |
mbed_official | 240:9a7c54113eaf | 154 | pin_function(obj->pin_miso, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF)); |
mbed_official | 240:9a7c54113eaf | 155 | pin_function(obj->pin_mosi, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF)); |
mbed_official | 240:9a7c54113eaf | 156 | pin_function(obj->pin_sclk, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF)); |
mbed_official | 240:9a7c54113eaf | 157 | pin_function(obj->pin_ssel, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF)); |
mbed_official | 130:1dec54e4aec3 | 158 | } |
mbed_official | 130:1dec54e4aec3 | 159 | |
mbed_official | 227:7bd0639b8911 | 160 | void spi_format(spi_t *obj, int bits, int mode, int slave) { |
mbed_official | 130:1dec54e4aec3 | 161 | // Save new values |
mbed_official | 240:9a7c54113eaf | 162 | if (bits == 16) { |
mbed_official | 240:9a7c54113eaf | 163 | obj->bits = SPI_DataSize_16b; |
mbed_official | 240:9a7c54113eaf | 164 | } else { |
mbed_official | 130:1dec54e4aec3 | 165 | obj->bits = SPI_DataSize_8b; |
mbed_official | 130:1dec54e4aec3 | 166 | } |
mbed_official | 130:1dec54e4aec3 | 167 | |
mbed_official | 130:1dec54e4aec3 | 168 | switch (mode) { |
mbed_official | 130:1dec54e4aec3 | 169 | case 0: |
mbed_official | 130:1dec54e4aec3 | 170 | obj->cpol = SPI_CPOL_Low; |
mbed_official | 130:1dec54e4aec3 | 171 | obj->cpha = SPI_CPHA_1Edge; |
mbed_official | 130:1dec54e4aec3 | 172 | break; |
mbed_official | 130:1dec54e4aec3 | 173 | case 1: |
mbed_official | 130:1dec54e4aec3 | 174 | obj->cpol = SPI_CPOL_Low; |
mbed_official | 130:1dec54e4aec3 | 175 | obj->cpha = SPI_CPHA_2Edge; |
mbed_official | 130:1dec54e4aec3 | 176 | break; |
mbed_official | 130:1dec54e4aec3 | 177 | case 2: |
mbed_official | 130:1dec54e4aec3 | 178 | obj->cpol = SPI_CPOL_High; |
mbed_official | 227:7bd0639b8911 | 179 | obj->cpha = SPI_CPHA_1Edge; |
mbed_official | 130:1dec54e4aec3 | 180 | break; |
mbed_official | 130:1dec54e4aec3 | 181 | default: |
mbed_official | 130:1dec54e4aec3 | 182 | obj->cpol = SPI_CPOL_High; |
mbed_official | 227:7bd0639b8911 | 183 | obj->cpha = SPI_CPHA_2Edge; |
mbed_official | 130:1dec54e4aec3 | 184 | break; |
mbed_official | 130:1dec54e4aec3 | 185 | } |
mbed_official | 130:1dec54e4aec3 | 186 | |
mbed_official | 130:1dec54e4aec3 | 187 | if (slave == 0) { |
mbed_official | 130:1dec54e4aec3 | 188 | obj->mode = SPI_Mode_Master; |
mbed_official | 130:1dec54e4aec3 | 189 | obj->nss = SPI_NSS_Soft; |
mbed_official | 240:9a7c54113eaf | 190 | } else { |
mbed_official | 130:1dec54e4aec3 | 191 | obj->mode = SPI_Mode_Slave; |
mbed_official | 227:7bd0639b8911 | 192 | obj->nss = SPI_NSS_Hard; |
mbed_official | 130:1dec54e4aec3 | 193 | } |
mbed_official | 130:1dec54e4aec3 | 194 | |
mbed_official | 130:1dec54e4aec3 | 195 | init_spi(obj); |
mbed_official | 130:1dec54e4aec3 | 196 | } |
mbed_official | 130:1dec54e4aec3 | 197 | |
mbed_official | 130:1dec54e4aec3 | 198 | void spi_frequency(spi_t *obj, int hz) { |
mbed_official | 240:9a7c54113eaf | 199 | // Note: The frequencies are obtained with SPI clock = 48 MHz (APB1 & APB2 clocks) |
mbed_official | 240:9a7c54113eaf | 200 | if (hz < 300000) { |
mbed_official | 240:9a7c54113eaf | 201 | obj->br_presc = SPI_BaudRatePrescaler_256; // 188 kHz |
mbed_official | 240:9a7c54113eaf | 202 | } else if ((hz >= 300000) && (hz < 700000)) { |
mbed_official | 240:9a7c54113eaf | 203 | obj->br_presc = SPI_BaudRatePrescaler_128; // 375 kHz |
mbed_official | 240:9a7c54113eaf | 204 | } else if ((hz >= 700000) && (hz < 1000000)) { |
mbed_official | 240:9a7c54113eaf | 205 | obj->br_presc = SPI_BaudRatePrescaler_64; // 750 kHz |
mbed_official | 240:9a7c54113eaf | 206 | } else if ((hz >= 1000000) && (hz < 3000000)) { |
mbed_official | 240:9a7c54113eaf | 207 | obj->br_presc = SPI_BaudRatePrescaler_32; // 1.5 MHz |
mbed_official | 240:9a7c54113eaf | 208 | } else if ((hz >= 3000000) && (hz < 6000000)) { |
mbed_official | 240:9a7c54113eaf | 209 | obj->br_presc = SPI_BaudRatePrescaler_16; // 3 MHz |
mbed_official | 240:9a7c54113eaf | 210 | } else if ((hz >= 6000000) && (hz < 12000000)) { |
mbed_official | 240:9a7c54113eaf | 211 | obj->br_presc = SPI_BaudRatePrescaler_8; // 6 MHz |
mbed_official | 240:9a7c54113eaf | 212 | } else if ((hz >= 12000000) && (hz < 24000000)) { |
mbed_official | 240:9a7c54113eaf | 213 | obj->br_presc = SPI_BaudRatePrescaler_4; // 12 MHz |
mbed_official | 240:9a7c54113eaf | 214 | } else { // >= 24000000 |
mbed_official | 240:9a7c54113eaf | 215 | obj->br_presc = SPI_BaudRatePrescaler_2; // 24 MHz |
mbed_official | 240:9a7c54113eaf | 216 | } |
mbed_official | 130:1dec54e4aec3 | 217 | init_spi(obj); |
mbed_official | 130:1dec54e4aec3 | 218 | } |
mbed_official | 130:1dec54e4aec3 | 219 | |
mbed_official | 130:1dec54e4aec3 | 220 | static inline int ssp_readable(spi_t *obj) { |
mbed_official | 130:1dec54e4aec3 | 221 | int status; |
mbed_official | 130:1dec54e4aec3 | 222 | SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); |
mbed_official | 130:1dec54e4aec3 | 223 | // Check if data is received |
mbed_official | 130:1dec54e4aec3 | 224 | status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) != RESET) ? 1 : 0); |
mbed_official | 227:7bd0639b8911 | 225 | return status; |
mbed_official | 130:1dec54e4aec3 | 226 | } |
mbed_official | 130:1dec54e4aec3 | 227 | |
mbed_official | 130:1dec54e4aec3 | 228 | static inline int ssp_writeable(spi_t *obj) { |
mbed_official | 130:1dec54e4aec3 | 229 | int status; |
mbed_official | 130:1dec54e4aec3 | 230 | SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); |
mbed_official | 130:1dec54e4aec3 | 231 | // Check if data is transmitted |
mbed_official | 130:1dec54e4aec3 | 232 | status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_TXE) != RESET) ? 1 : 0); |
mbed_official | 130:1dec54e4aec3 | 233 | return status; |
mbed_official | 130:1dec54e4aec3 | 234 | } |
mbed_official | 130:1dec54e4aec3 | 235 | |
mbed_official | 130:1dec54e4aec3 | 236 | static inline void ssp_write(spi_t *obj, int value) { |
mbed_official | 227:7bd0639b8911 | 237 | SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); |
mbed_official | 130:1dec54e4aec3 | 238 | while (!ssp_writeable(obj)); |
mbed_official | 240:9a7c54113eaf | 239 | if (obj->bits == SPI_DataSize_8b) { |
mbed_official | 130:1dec54e4aec3 | 240 | SPI_SendData8(spi, (uint8_t)value); |
mbed_official | 240:9a7c54113eaf | 241 | } else { // 16-bit |
mbed_official | 130:1dec54e4aec3 | 242 | SPI_I2S_SendData16(spi, (uint16_t)value); |
mbed_official | 240:9a7c54113eaf | 243 | } |
mbed_official | 130:1dec54e4aec3 | 244 | } |
mbed_official | 130:1dec54e4aec3 | 245 | |
mbed_official | 130:1dec54e4aec3 | 246 | static inline int ssp_read(spi_t *obj) { |
mbed_official | 227:7bd0639b8911 | 247 | SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); |
mbed_official | 130:1dec54e4aec3 | 248 | while (!ssp_readable(obj)); |
mbed_official | 240:9a7c54113eaf | 249 | if (obj->bits == SPI_DataSize_8b) { |
mbed_official | 130:1dec54e4aec3 | 250 | return (int)SPI_ReceiveData8(spi); |
mbed_official | 240:9a7c54113eaf | 251 | } else { // 16-bit |
mbed_official | 227:7bd0639b8911 | 252 | return (int)SPI_I2S_ReceiveData16(spi); |
mbed_official | 240:9a7c54113eaf | 253 | } |
mbed_official | 130:1dec54e4aec3 | 254 | } |
mbed_official | 130:1dec54e4aec3 | 255 | |
mbed_official | 130:1dec54e4aec3 | 256 | static inline int ssp_busy(spi_t *obj) { |
mbed_official | 130:1dec54e4aec3 | 257 | int status; |
mbed_official | 130:1dec54e4aec3 | 258 | SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); |
mbed_official | 130:1dec54e4aec3 | 259 | status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_BSY) != RESET) ? 1 : 0); |
mbed_official | 130:1dec54e4aec3 | 260 | return status; |
mbed_official | 130:1dec54e4aec3 | 261 | } |
mbed_official | 130:1dec54e4aec3 | 262 | |
mbed_official | 130:1dec54e4aec3 | 263 | int spi_master_write(spi_t *obj, int value) { |
mbed_official | 130:1dec54e4aec3 | 264 | ssp_write(obj, value); |
mbed_official | 130:1dec54e4aec3 | 265 | return ssp_read(obj); |
mbed_official | 130:1dec54e4aec3 | 266 | } |
mbed_official | 130:1dec54e4aec3 | 267 | |
mbed_official | 130:1dec54e4aec3 | 268 | int spi_slave_receive(spi_t *obj) { |
mbed_official | 240:9a7c54113eaf | 269 | return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0); |
mbed_official | 130:1dec54e4aec3 | 270 | }; |
mbed_official | 130:1dec54e4aec3 | 271 | |
mbed_official | 130:1dec54e4aec3 | 272 | int spi_slave_read(spi_t *obj) { |
mbed_official | 130:1dec54e4aec3 | 273 | SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); |
mbed_official | 240:9a7c54113eaf | 274 | if (obj->bits == SPI_DataSize_8b) { |
mbed_official | 130:1dec54e4aec3 | 275 | return (int)SPI_ReceiveData8(spi); |
mbed_official | 240:9a7c54113eaf | 276 | } else { // 16-bit |
mbed_official | 227:7bd0639b8911 | 277 | return (int)SPI_I2S_ReceiveData16(spi); |
mbed_official | 240:9a7c54113eaf | 278 | } |
mbed_official | 130:1dec54e4aec3 | 279 | } |
mbed_official | 130:1dec54e4aec3 | 280 | |
mbed_official | 130:1dec54e4aec3 | 281 | void spi_slave_write(spi_t *obj, int value) { |
mbed_official | 227:7bd0639b8911 | 282 | SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); |
mbed_official | 227:7bd0639b8911 | 283 | while (!ssp_writeable(obj)); |
mbed_official | 240:9a7c54113eaf | 284 | if (obj->bits == SPI_DataSize_8b) { |
mbed_official | 130:1dec54e4aec3 | 285 | SPI_SendData8(spi, (uint8_t)value); |
mbed_official | 240:9a7c54113eaf | 286 | } else { // 16-bit |
mbed_official | 130:1dec54e4aec3 | 287 | SPI_I2S_SendData16(spi, (uint16_t)value); |
mbed_official | 240:9a7c54113eaf | 288 | } |
mbed_official | 130:1dec54e4aec3 | 289 | } |
mbed_official | 130:1dec54e4aec3 | 290 | |
mbed_official | 130:1dec54e4aec3 | 291 | int spi_busy(spi_t *obj) { |
mbed_official | 130:1dec54e4aec3 | 292 | return ssp_busy(obj); |
mbed_official | 130:1dec54e4aec3 | 293 | } |
mbed_official | 130:1dec54e4aec3 | 294 | |
mbed_official | 130:1dec54e4aec3 | 295 | #endif |