mbed library sources
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_NUCLEO_F334R8/spi_api.c@445:9a3ffe6cfa19, 2015-01-14 (annotated)
- Committer:
- moirans2
- Date:
- Wed Jan 14 20:53:08 2015 +0000
- Revision:
- 445:9a3ffe6cfa19
- Parent:
- 414:4ec4c5b614b0
internal clock stm32L051
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 237:f3da66175598 | 1 | /* mbed Microcontroller Library |
mbed_official | 237:f3da66175598 | 2 | ******************************************************************************* |
mbed_official | 237:f3da66175598 | 3 | * Copyright (c) 2014, STMicroelectronics |
mbed_official | 237:f3da66175598 | 4 | * All rights reserved. |
mbed_official | 237:f3da66175598 | 5 | * |
mbed_official | 237:f3da66175598 | 6 | * Redistribution and use in source and binary forms, with or without |
mbed_official | 237:f3da66175598 | 7 | * modification, are permitted provided that the following conditions are met: |
mbed_official | 237:f3da66175598 | 8 | * |
mbed_official | 237:f3da66175598 | 9 | * 1. Redistributions of source code must retain the above copyright notice, |
mbed_official | 237:f3da66175598 | 10 | * this list of conditions and the following disclaimer. |
mbed_official | 237:f3da66175598 | 11 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
mbed_official | 237:f3da66175598 | 12 | * this list of conditions and the following disclaimer in the documentation |
mbed_official | 237:f3da66175598 | 13 | * and/or other materials provided with the distribution. |
mbed_official | 237:f3da66175598 | 14 | * 3. Neither the name of STMicroelectronics nor the names of its contributors |
mbed_official | 237:f3da66175598 | 15 | * may be used to endorse or promote products derived from this software |
mbed_official | 237:f3da66175598 | 16 | * without specific prior written permission. |
mbed_official | 237:f3da66175598 | 17 | * |
mbed_official | 237:f3da66175598 | 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
mbed_official | 237:f3da66175598 | 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
mbed_official | 237:f3da66175598 | 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
mbed_official | 237:f3da66175598 | 21 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
mbed_official | 237:f3da66175598 | 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
mbed_official | 237:f3da66175598 | 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
mbed_official | 237:f3da66175598 | 24 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
mbed_official | 237:f3da66175598 | 25 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
mbed_official | 237:f3da66175598 | 26 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
mbed_official | 237:f3da66175598 | 27 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
mbed_official | 237:f3da66175598 | 28 | ******************************************************************************* |
mbed_official | 237:f3da66175598 | 29 | */ |
mbed_official | 237:f3da66175598 | 30 | #include "mbed_assert.h" |
mbed_official | 237:f3da66175598 | 31 | #include "spi_api.h" |
mbed_official | 237:f3da66175598 | 32 | |
mbed_official | 237:f3da66175598 | 33 | #if DEVICE_SPI |
mbed_official | 237:f3da66175598 | 34 | |
mbed_official | 237:f3da66175598 | 35 | #include <math.h> |
mbed_official | 237:f3da66175598 | 36 | #include "cmsis.h" |
mbed_official | 237:f3da66175598 | 37 | #include "pinmap.h" |
mbed_official | 414:4ec4c5b614b0 | 38 | #include "PeripheralPins.h" |
mbed_official | 237:f3da66175598 | 39 | |
mbed_official | 237:f3da66175598 | 40 | static SPI_HandleTypeDef SpiHandle; |
mbed_official | 237:f3da66175598 | 41 | |
mbed_official | 237:f3da66175598 | 42 | static void init_spi(spi_t *obj) |
mbed_official | 237:f3da66175598 | 43 | { |
mbed_official | 237:f3da66175598 | 44 | SpiHandle.Instance = (SPI_TypeDef *)(obj->spi); |
mbed_official | 237:f3da66175598 | 45 | |
mbed_official | 237:f3da66175598 | 46 | __HAL_SPI_DISABLE(&SpiHandle); |
mbed_official | 237:f3da66175598 | 47 | |
mbed_official | 237:f3da66175598 | 48 | SpiHandle.Init.Mode = obj->mode; |
mbed_official | 237:f3da66175598 | 49 | SpiHandle.Init.BaudRatePrescaler = obj->br_presc; |
mbed_official | 237:f3da66175598 | 50 | SpiHandle.Init.Direction = SPI_DIRECTION_2LINES; |
mbed_official | 237:f3da66175598 | 51 | SpiHandle.Init.CLKPhase = obj->cpha; |
mbed_official | 237:f3da66175598 | 52 | SpiHandle.Init.CLKPolarity = obj->cpol; |
mbed_official | 237:f3da66175598 | 53 | SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED; |
mbed_official | 237:f3da66175598 | 54 | SpiHandle.Init.CRCPolynomial = 7; |
mbed_official | 237:f3da66175598 | 55 | SpiHandle.Init.DataSize = obj->bits; |
mbed_official | 237:f3da66175598 | 56 | SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB; |
mbed_official | 237:f3da66175598 | 57 | SpiHandle.Init.NSS = obj->nss; |
mbed_official | 237:f3da66175598 | 58 | SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED; |
mbed_official | 237:f3da66175598 | 59 | |
mbed_official | 237:f3da66175598 | 60 | HAL_SPI_Init(&SpiHandle); |
mbed_official | 237:f3da66175598 | 61 | |
mbed_official | 237:f3da66175598 | 62 | __HAL_SPI_ENABLE(&SpiHandle); |
mbed_official | 237:f3da66175598 | 63 | } |
mbed_official | 237:f3da66175598 | 64 | |
mbed_official | 237:f3da66175598 | 65 | void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) |
mbed_official | 237:f3da66175598 | 66 | { |
mbed_official | 237:f3da66175598 | 67 | // Determine the SPI to use |
mbed_official | 237:f3da66175598 | 68 | SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI); |
mbed_official | 237:f3da66175598 | 69 | SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO); |
mbed_official | 237:f3da66175598 | 70 | SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK); |
mbed_official | 237:f3da66175598 | 71 | SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL); |
mbed_official | 237:f3da66175598 | 72 | |
mbed_official | 237:f3da66175598 | 73 | SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso); |
mbed_official | 237:f3da66175598 | 74 | SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel); |
mbed_official | 237:f3da66175598 | 75 | |
mbed_official | 237:f3da66175598 | 76 | obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl); |
mbed_official | 237:f3da66175598 | 77 | MBED_ASSERT(obj->spi != (SPIName)NC); |
mbed_official | 237:f3da66175598 | 78 | |
mbed_official | 237:f3da66175598 | 79 | // Enable SPI clock |
mbed_official | 237:f3da66175598 | 80 | __SPI1_CLK_ENABLE(); |
mbed_official | 237:f3da66175598 | 81 | |
mbed_official | 237:f3da66175598 | 82 | // Configure the SPI pins |
mbed_official | 237:f3da66175598 | 83 | pinmap_pinout(mosi, PinMap_SPI_MOSI); |
mbed_official | 237:f3da66175598 | 84 | pinmap_pinout(miso, PinMap_SPI_MISO); |
mbed_official | 237:f3da66175598 | 85 | pinmap_pinout(sclk, PinMap_SPI_SCLK); |
mbed_official | 237:f3da66175598 | 86 | |
mbed_official | 237:f3da66175598 | 87 | // Save new values |
mbed_official | 237:f3da66175598 | 88 | obj->bits = SPI_DATASIZE_8BIT; |
mbed_official | 237:f3da66175598 | 89 | obj->cpol = SPI_POLARITY_LOW; |
mbed_official | 237:f3da66175598 | 90 | obj->cpha = SPI_PHASE_1EDGE; |
mbed_official | 404:cbc7dfcb0ce9 | 91 | obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1 MHz (HSI) or 1.13 MHz (HSE) |
mbed_official | 237:f3da66175598 | 92 | |
mbed_official | 237:f3da66175598 | 93 | obj->pin_miso = miso; |
mbed_official | 237:f3da66175598 | 94 | obj->pin_mosi = mosi; |
mbed_official | 237:f3da66175598 | 95 | obj->pin_sclk = sclk; |
mbed_official | 237:f3da66175598 | 96 | obj->pin_ssel = ssel; |
mbed_official | 237:f3da66175598 | 97 | |
mbed_official | 237:f3da66175598 | 98 | if (ssel == NC) { // SW NSS Master mode |
mbed_official | 237:f3da66175598 | 99 | obj->mode = SPI_MODE_MASTER; |
mbed_official | 237:f3da66175598 | 100 | obj->nss = SPI_NSS_SOFT; |
mbed_official | 237:f3da66175598 | 101 | } else { // Slave |
mbed_official | 237:f3da66175598 | 102 | pinmap_pinout(ssel, PinMap_SPI_SSEL); |
mbed_official | 237:f3da66175598 | 103 | obj->mode = SPI_MODE_SLAVE; |
mbed_official | 237:f3da66175598 | 104 | obj->nss = SPI_NSS_HARD_INPUT; |
mbed_official | 237:f3da66175598 | 105 | } |
mbed_official | 237:f3da66175598 | 106 | |
mbed_official | 237:f3da66175598 | 107 | init_spi(obj); |
mbed_official | 237:f3da66175598 | 108 | } |
mbed_official | 237:f3da66175598 | 109 | |
mbed_official | 237:f3da66175598 | 110 | void spi_free(spi_t *obj) |
mbed_official | 237:f3da66175598 | 111 | { |
mbed_official | 237:f3da66175598 | 112 | // Reset SPI and disable clock |
mbed_official | 237:f3da66175598 | 113 | __SPI1_FORCE_RESET(); |
mbed_official | 237:f3da66175598 | 114 | __SPI1_RELEASE_RESET(); |
mbed_official | 237:f3da66175598 | 115 | __SPI1_CLK_DISABLE(); |
mbed_official | 237:f3da66175598 | 116 | |
mbed_official | 237:f3da66175598 | 117 | // Configure GPIOs |
mbed_official | 237:f3da66175598 | 118 | pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0)); |
mbed_official | 237:f3da66175598 | 119 | pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0)); |
mbed_official | 237:f3da66175598 | 120 | pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0)); |
mbed_official | 237:f3da66175598 | 121 | pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0)); |
mbed_official | 237:f3da66175598 | 122 | } |
mbed_official | 237:f3da66175598 | 123 | |
mbed_official | 237:f3da66175598 | 124 | void spi_format(spi_t *obj, int bits, int mode, int slave) |
mbed_official | 237:f3da66175598 | 125 | { |
mbed_official | 237:f3da66175598 | 126 | // Save new values |
mbed_official | 237:f3da66175598 | 127 | if (bits == 16) { |
mbed_official | 237:f3da66175598 | 128 | obj->bits = SPI_DATASIZE_16BIT; |
mbed_official | 237:f3da66175598 | 129 | } else { |
mbed_official | 237:f3da66175598 | 130 | obj->bits = SPI_DATASIZE_8BIT; |
mbed_official | 237:f3da66175598 | 131 | } |
mbed_official | 237:f3da66175598 | 132 | |
mbed_official | 237:f3da66175598 | 133 | switch (mode) { |
mbed_official | 237:f3da66175598 | 134 | case 0: |
mbed_official | 237:f3da66175598 | 135 | obj->cpol = SPI_POLARITY_LOW; |
mbed_official | 237:f3da66175598 | 136 | obj->cpha = SPI_PHASE_1EDGE; |
mbed_official | 237:f3da66175598 | 137 | break; |
mbed_official | 237:f3da66175598 | 138 | case 1: |
mbed_official | 237:f3da66175598 | 139 | obj->cpol = SPI_POLARITY_LOW; |
mbed_official | 237:f3da66175598 | 140 | obj->cpha = SPI_PHASE_2EDGE; |
mbed_official | 237:f3da66175598 | 141 | break; |
mbed_official | 237:f3da66175598 | 142 | case 2: |
mbed_official | 237:f3da66175598 | 143 | obj->cpol = SPI_POLARITY_HIGH; |
mbed_official | 237:f3da66175598 | 144 | obj->cpha = SPI_PHASE_1EDGE; |
mbed_official | 237:f3da66175598 | 145 | break; |
mbed_official | 237:f3da66175598 | 146 | default: |
mbed_official | 237:f3da66175598 | 147 | obj->cpol = SPI_POLARITY_HIGH; |
mbed_official | 237:f3da66175598 | 148 | obj->cpha = SPI_PHASE_2EDGE; |
mbed_official | 237:f3da66175598 | 149 | break; |
mbed_official | 237:f3da66175598 | 150 | } |
mbed_official | 237:f3da66175598 | 151 | |
mbed_official | 237:f3da66175598 | 152 | if (slave == 0) { |
mbed_official | 237:f3da66175598 | 153 | obj->mode = SPI_MODE_MASTER; |
mbed_official | 237:f3da66175598 | 154 | obj->nss = SPI_NSS_SOFT; |
mbed_official | 237:f3da66175598 | 155 | } else { |
mbed_official | 237:f3da66175598 | 156 | obj->mode = SPI_MODE_SLAVE; |
mbed_official | 237:f3da66175598 | 157 | obj->nss = SPI_NSS_HARD_INPUT; |
mbed_official | 237:f3da66175598 | 158 | } |
mbed_official | 237:f3da66175598 | 159 | |
mbed_official | 237:f3da66175598 | 160 | init_spi(obj); |
mbed_official | 237:f3da66175598 | 161 | } |
mbed_official | 237:f3da66175598 | 162 | |
mbed_official | 237:f3da66175598 | 163 | void spi_frequency(spi_t *obj, int hz) |
mbed_official | 237:f3da66175598 | 164 | { |
mbed_official | 237:f3da66175598 | 165 | // Values depend of APB2CLK : 64 MHz if HSI is used, 72 MHz if HSE is used |
mbed_official | 237:f3da66175598 | 166 | if (hz < 500000) { |
mbed_official | 237:f3da66175598 | 167 | obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 250 kHz - 281 kHz |
mbed_official | 237:f3da66175598 | 168 | } else if ((hz >= 500000) && (hz < 1000000)) { |
mbed_official | 237:f3da66175598 | 169 | obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 500 kHz - 563 kHz |
mbed_official | 237:f3da66175598 | 170 | } else if ((hz >= 1000000) && (hz < 2000000)) { |
mbed_official | 237:f3da66175598 | 171 | obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1 MHz - 1.13 MHz |
mbed_official | 237:f3da66175598 | 172 | } else if ((hz >= 2000000) && (hz < 4000000)) { |
mbed_official | 237:f3da66175598 | 173 | obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2 MHz - 2.25 MHz |
mbed_official | 237:f3da66175598 | 174 | } else if ((hz >= 4000000) && (hz < 8000000)) { |
mbed_official | 237:f3da66175598 | 175 | obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 4 MHz - 4.5 MHz |
mbed_official | 237:f3da66175598 | 176 | } else if ((hz >= 8000000) && (hz < 16000000)) { |
mbed_official | 237:f3da66175598 | 177 | obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 8 MHz - 9 MHz |
mbed_official | 237:f3da66175598 | 178 | } else if ((hz >= 16000000) && (hz < 32000000)) { |
mbed_official | 237:f3da66175598 | 179 | obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 16 MHz - 18 MHz |
mbed_official | 237:f3da66175598 | 180 | } else { // >= 32000000 |
mbed_official | 237:f3da66175598 | 181 | obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 32 MHz - 36 MHz |
mbed_official | 237:f3da66175598 | 182 | } |
mbed_official | 237:f3da66175598 | 183 | |
mbed_official | 237:f3da66175598 | 184 | init_spi(obj); |
mbed_official | 237:f3da66175598 | 185 | } |
mbed_official | 237:f3da66175598 | 186 | |
mbed_official | 237:f3da66175598 | 187 | static inline int ssp_readable(spi_t *obj) |
mbed_official | 237:f3da66175598 | 188 | { |
mbed_official | 237:f3da66175598 | 189 | int status; |
mbed_official | 237:f3da66175598 | 190 | SpiHandle.Instance = (SPI_TypeDef *)(obj->spi); |
mbed_official | 237:f3da66175598 | 191 | // Check if data is received |
mbed_official | 237:f3da66175598 | 192 | status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0); |
mbed_official | 237:f3da66175598 | 193 | return status; |
mbed_official | 237:f3da66175598 | 194 | } |
mbed_official | 237:f3da66175598 | 195 | |
mbed_official | 237:f3da66175598 | 196 | static inline int ssp_writeable(spi_t *obj) |
mbed_official | 237:f3da66175598 | 197 | { |
mbed_official | 237:f3da66175598 | 198 | int status; |
mbed_official | 237:f3da66175598 | 199 | SpiHandle.Instance = (SPI_TypeDef *)(obj->spi); |
mbed_official | 237:f3da66175598 | 200 | // Check if data is transmitted |
mbed_official | 237:f3da66175598 | 201 | status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0); |
mbed_official | 237:f3da66175598 | 202 | return status; |
mbed_official | 237:f3da66175598 | 203 | } |
mbed_official | 237:f3da66175598 | 204 | |
mbed_official | 237:f3da66175598 | 205 | static inline void ssp_write(spi_t *obj, int value) |
mbed_official | 237:f3da66175598 | 206 | { |
mbed_official | 237:f3da66175598 | 207 | SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); |
mbed_official | 237:f3da66175598 | 208 | while (!ssp_writeable(obj)); |
mbed_official | 237:f3da66175598 | 209 | if (obj->bits == SPI_DATASIZE_8BIT) { |
mbed_official | 237:f3da66175598 | 210 | // Force 8-bit access to the data register |
mbed_official | 237:f3da66175598 | 211 | uint8_t *p_spi_dr = 0; |
mbed_official | 237:f3da66175598 | 212 | p_spi_dr = (uint8_t *) & (spi->DR); |
mbed_official | 237:f3da66175598 | 213 | *p_spi_dr = (uint8_t)value; |
mbed_official | 237:f3da66175598 | 214 | } else { // SPI_DATASIZE_16BIT |
mbed_official | 237:f3da66175598 | 215 | spi->DR = (uint16_t)value; |
mbed_official | 237:f3da66175598 | 216 | } |
mbed_official | 237:f3da66175598 | 217 | } |
mbed_official | 237:f3da66175598 | 218 | |
mbed_official | 237:f3da66175598 | 219 | static inline int ssp_read(spi_t *obj) |
mbed_official | 237:f3da66175598 | 220 | { |
mbed_official | 237:f3da66175598 | 221 | SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); |
mbed_official | 237:f3da66175598 | 222 | while (!ssp_readable(obj)); |
mbed_official | 237:f3da66175598 | 223 | if (obj->bits == SPI_DATASIZE_8BIT) { |
mbed_official | 237:f3da66175598 | 224 | // Force 8-bit access to the data register |
mbed_official | 237:f3da66175598 | 225 | uint8_t *p_spi_dr = 0; |
mbed_official | 237:f3da66175598 | 226 | p_spi_dr = (uint8_t *) & (spi->DR); |
mbed_official | 237:f3da66175598 | 227 | return (int)(*p_spi_dr); |
mbed_official | 237:f3da66175598 | 228 | } else { |
mbed_official | 237:f3da66175598 | 229 | return (int)spi->DR; |
mbed_official | 237:f3da66175598 | 230 | } |
mbed_official | 237:f3da66175598 | 231 | } |
mbed_official | 237:f3da66175598 | 232 | |
mbed_official | 237:f3da66175598 | 233 | static inline int ssp_busy(spi_t *obj) |
mbed_official | 237:f3da66175598 | 234 | { |
mbed_official | 237:f3da66175598 | 235 | int status; |
mbed_official | 237:f3da66175598 | 236 | SpiHandle.Instance = (SPI_TypeDef *)(obj->spi); |
mbed_official | 237:f3da66175598 | 237 | status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0); |
mbed_official | 237:f3da66175598 | 238 | return status; |
mbed_official | 237:f3da66175598 | 239 | } |
mbed_official | 237:f3da66175598 | 240 | |
mbed_official | 237:f3da66175598 | 241 | int spi_master_write(spi_t *obj, int value) |
mbed_official | 237:f3da66175598 | 242 | { |
mbed_official | 237:f3da66175598 | 243 | ssp_write(obj, value); |
mbed_official | 237:f3da66175598 | 244 | return ssp_read(obj); |
mbed_official | 237:f3da66175598 | 245 | } |
mbed_official | 237:f3da66175598 | 246 | |
mbed_official | 237:f3da66175598 | 247 | int spi_slave_receive(spi_t *obj) |
mbed_official | 237:f3da66175598 | 248 | { |
mbed_official | 237:f3da66175598 | 249 | return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0); |
mbed_official | 237:f3da66175598 | 250 | }; |
mbed_official | 237:f3da66175598 | 251 | |
mbed_official | 237:f3da66175598 | 252 | int spi_slave_read(spi_t *obj) |
mbed_official | 237:f3da66175598 | 253 | { |
mbed_official | 237:f3da66175598 | 254 | SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); |
mbed_official | 237:f3da66175598 | 255 | while (!ssp_readable(obj)); |
mbed_official | 237:f3da66175598 | 256 | if (obj->bits == SPI_DATASIZE_8BIT) { |
mbed_official | 237:f3da66175598 | 257 | // Force 8-bit access to the data register |
mbed_official | 237:f3da66175598 | 258 | uint8_t *p_spi_dr = 0; |
mbed_official | 237:f3da66175598 | 259 | p_spi_dr = (uint8_t *) & (spi->DR); |
mbed_official | 237:f3da66175598 | 260 | return (int)(*p_spi_dr); |
mbed_official | 237:f3da66175598 | 261 | } else { |
mbed_official | 237:f3da66175598 | 262 | return (int)spi->DR; |
mbed_official | 237:f3da66175598 | 263 | } |
mbed_official | 237:f3da66175598 | 264 | } |
mbed_official | 237:f3da66175598 | 265 | |
mbed_official | 237:f3da66175598 | 266 | void spi_slave_write(spi_t *obj, int value) |
mbed_official | 237:f3da66175598 | 267 | { |
mbed_official | 237:f3da66175598 | 268 | SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi); |
mbed_official | 237:f3da66175598 | 269 | while (!ssp_writeable(obj)); |
mbed_official | 237:f3da66175598 | 270 | if (obj->bits == SPI_DATASIZE_8BIT) { |
mbed_official | 237:f3da66175598 | 271 | // Force 8-bit access to the data register |
mbed_official | 237:f3da66175598 | 272 | uint8_t *p_spi_dr = 0; |
mbed_official | 237:f3da66175598 | 273 | p_spi_dr = (uint8_t *) & (spi->DR); |
mbed_official | 237:f3da66175598 | 274 | *p_spi_dr = (uint8_t)value; |
mbed_official | 237:f3da66175598 | 275 | } else { // SPI_DATASIZE_16BIT |
mbed_official | 237:f3da66175598 | 276 | spi->DR = (uint16_t)value; |
mbed_official | 237:f3da66175598 | 277 | } |
mbed_official | 237:f3da66175598 | 278 | } |
mbed_official | 237:f3da66175598 | 279 | |
mbed_official | 237:f3da66175598 | 280 | int spi_busy(spi_t *obj) |
mbed_official | 237:f3da66175598 | 281 | { |
mbed_official | 237:f3da66175598 | 282 | return ssp_busy(obj); |
mbed_official | 237:f3da66175598 | 283 | } |
mbed_official | 237:f3da66175598 | 284 | |
mbed_official | 237:f3da66175598 | 285 | #endif |