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mbed library sources

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F072RB/spi_api.c@440:8a0b45cd594f, 2014-12-16 (annotated)

Committer:
mbed_official
Date:
Tue Dec 16 08:15:08 2014 +0000
Revision:
440:8a0b45cd594f
Parent:
414:4ec4c5b614b0 
Synchronized with git revision 67fbbf0b635d0c0d93fbe433306c537c2ad206aa



Full URL: https://github.com/mbedmicro/mbed/commit/67fbbf0b635d0c0d93fbe433306c537c2ad206aa/



Targets: nrf51 - updating app_timer.c from Norid'c SDKv7.1.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 219:993c9b0acbcc 1 /* mbed Microcontroller Library
mbed_official 219:993c9b0acbcc 2 *******************************************************************************
mbed_official 219:993c9b0acbcc 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 219:993c9b0acbcc 4 * All rights reserved.
mbed_official 219:993c9b0acbcc 5 *
mbed_official 219:993c9b0acbcc 6 * Redistribution and use in source and binary forms, with or without
mbed_official 219:993c9b0acbcc 7 * modification, are permitted provided that the following conditions are met:
mbed_official 219:993c9b0acbcc 8 *
mbed_official 219:993c9b0acbcc 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 219:993c9b0acbcc 10 * this list of conditions and the following disclaimer.
mbed_official 219:993c9b0acbcc 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 219:993c9b0acbcc 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 219:993c9b0acbcc 13 * and/or other materials provided with the distribution.
mbed_official 219:993c9b0acbcc 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 219:993c9b0acbcc 15 * may be used to endorse or promote products derived from this software
mbed_official 219:993c9b0acbcc 16 * without specific prior written permission.
mbed_official 219:993c9b0acbcc 17 *
mbed_official 219:993c9b0acbcc 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 219:993c9b0acbcc 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 219:993c9b0acbcc 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 219:993c9b0acbcc 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 219:993c9b0acbcc 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 219:993c9b0acbcc 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 219:993c9b0acbcc 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 219:993c9b0acbcc 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 219:993c9b0acbcc 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 219:993c9b0acbcc 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 219:993c9b0acbcc 28 *******************************************************************************
mbed_official 219:993c9b0acbcc 29 */
mbed_official 239:8cadf13dff33 30 #include "mbed_assert.h"
mbed_official 219:993c9b0acbcc 31 #include "spi_api.h"
mbed_official 219:993c9b0acbcc 32
mbed_official 219:993c9b0acbcc 33 #if DEVICE_SPI
mbed_official 219:993c9b0acbcc 34
mbed_official 219:993c9b0acbcc 35 #include <math.h>
mbed_official 219:993c9b0acbcc 36 #include "cmsis.h"
mbed_official 219:993c9b0acbcc 37 #include "pinmap.h"
mbed_official 414:4ec4c5b614b0 38 #include "PeripheralPins.h"
mbed_official 219:993c9b0acbcc 39
mbed_official 219:993c9b0acbcc 40 static SPI_HandleTypeDef SpiHandle;
mbed_official 219:993c9b0acbcc 41
mbed_official 402:09075a3b15e3 42 static void init_spi(spi_t *obj)
mbed_official 402:09075a3b15e3 43 {
mbed_official 219:993c9b0acbcc 44 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 45
mbed_official 219:993c9b0acbcc 46 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 219:993c9b0acbcc 47
mbed_official 219:993c9b0acbcc 48 SpiHandle.Init.Mode = obj->mode;
mbed_official 219:993c9b0acbcc 49 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 219:993c9b0acbcc 50 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 219:993c9b0acbcc 51 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 219:993c9b0acbcc 52 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 219:993c9b0acbcc 53 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 219:993c9b0acbcc 54 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 219:993c9b0acbcc 55 SpiHandle.Init.DataSize = obj->bits;
mbed_official 219:993c9b0acbcc 56 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 219:993c9b0acbcc 57 SpiHandle.Init.NSS = obj->nss;
mbed_official 219:993c9b0acbcc 58 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 219:993c9b0acbcc 59
mbed_official 219:993c9b0acbcc 60 HAL_SPI_Init(&SpiHandle);
mbed_official 219:993c9b0acbcc 61
mbed_official 219:993c9b0acbcc 62 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 219:993c9b0acbcc 63 }
mbed_official 219:993c9b0acbcc 64
mbed_official 402:09075a3b15e3 65 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
mbed_official 402:09075a3b15e3 66 {
mbed_official 219:993c9b0acbcc 67 // Determine the SPI to use
mbed_official 219:993c9b0acbcc 68 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 219:993c9b0acbcc 69 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 219:993c9b0acbcc 70 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 219:993c9b0acbcc 71 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 219:993c9b0acbcc 72
mbed_official 219:993c9b0acbcc 73 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 219:993c9b0acbcc 74 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 219:993c9b0acbcc 75
mbed_official 219:993c9b0acbcc 76 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 239:8cadf13dff33 77 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 219:993c9b0acbcc 78
mbed_official 219:993c9b0acbcc 79 // Enable SPI clock
mbed_official 219:993c9b0acbcc 80 if (obj->spi == SPI_1) {
mbed_official 219:993c9b0acbcc 81 __SPI1_CLK_ENABLE();
mbed_official 219:993c9b0acbcc 82 }
mbed_official 219:993c9b0acbcc 83 if (obj->spi == SPI_2) {
mbed_official 219:993c9b0acbcc 84 __SPI2_CLK_ENABLE();
mbed_official 219:993c9b0acbcc 85 }
mbed_official 219:993c9b0acbcc 86
mbed_official 219:993c9b0acbcc 87 // Configure the SPI pins
mbed_official 219:993c9b0acbcc 88 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 219:993c9b0acbcc 89 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 219:993c9b0acbcc 90 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 219:993c9b0acbcc 91
mbed_official 219:993c9b0acbcc 92 // Save new values
mbed_official 219:993c9b0acbcc 93 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 219:993c9b0acbcc 94 obj->cpol = SPI_POLARITY_LOW;
mbed_official 219:993c9b0acbcc 95 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 219:993c9b0acbcc 96 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
mbed_official 219:993c9b0acbcc 97
mbed_official 219:993c9b0acbcc 98 obj->pin_miso = miso;
mbed_official 219:993c9b0acbcc 99 obj->pin_mosi = mosi;
mbed_official 219:993c9b0acbcc 100 obj->pin_sclk = sclk;
mbed_official 219:993c9b0acbcc 101 obj->pin_ssel = ssel;
mbed_official 219:993c9b0acbcc 102
mbed_official 219:993c9b0acbcc 103 if (ssel == NC) { // SW NSS Master mode
mbed_official 219:993c9b0acbcc 104 obj->mode = SPI_MODE_MASTER;
mbed_official 219:993c9b0acbcc 105 obj->nss = SPI_NSS_SOFT;
mbed_official 219:993c9b0acbcc 106 } else { // Slave
mbed_official 219:993c9b0acbcc 107 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 219:993c9b0acbcc 108 obj->mode = SPI_MODE_SLAVE;
mbed_official 219:993c9b0acbcc 109 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 219:993c9b0acbcc 110 }
mbed_official 219:993c9b0acbcc 111
mbed_official 219:993c9b0acbcc 112 init_spi(obj);
mbed_official 219:993c9b0acbcc 113 }
mbed_official 219:993c9b0acbcc 114
mbed_official 402:09075a3b15e3 115 void spi_free(spi_t *obj)
mbed_official 402:09075a3b15e3 116 {
mbed_official 219:993c9b0acbcc 117 // Reset SPI and disable clock
mbed_official 219:993c9b0acbcc 118 if (obj->spi == SPI_1) {
mbed_official 219:993c9b0acbcc 119 __SPI1_FORCE_RESET();
mbed_official 219:993c9b0acbcc 120 __SPI1_RELEASE_RESET();
mbed_official 219:993c9b0acbcc 121 __SPI1_CLK_DISABLE();
mbed_official 219:993c9b0acbcc 122 }
mbed_official 219:993c9b0acbcc 123
mbed_official 219:993c9b0acbcc 124 if (obj->spi == SPI_2) {
mbed_official 219:993c9b0acbcc 125 __SPI2_FORCE_RESET();
mbed_official 219:993c9b0acbcc 126 __SPI2_RELEASE_RESET();
mbed_official 219:993c9b0acbcc 127 __SPI2_CLK_DISABLE();
mbed_official 219:993c9b0acbcc 128 }
mbed_official 219:993c9b0acbcc 129
mbed_official 404:cbc7dfcb0ce9 130 // Configure GPIOs
mbed_official 219:993c9b0acbcc 131 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 219:993c9b0acbcc 132 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 219:993c9b0acbcc 133 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 219:993c9b0acbcc 134 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 219:993c9b0acbcc 135 }
mbed_official 219:993c9b0acbcc 136
mbed_official 402:09075a3b15e3 137 void spi_format(spi_t *obj, int bits, int mode, int slave)
mbed_official 402:09075a3b15e3 138 {
mbed_official 219:993c9b0acbcc 139 // Save new values
mbed_official 219:993c9b0acbcc 140 if (bits == 16) {
mbed_official 219:993c9b0acbcc 141 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 219:993c9b0acbcc 142 } else {
mbed_official 219:993c9b0acbcc 143 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 219:993c9b0acbcc 144 }
mbed_official 219:993c9b0acbcc 145
mbed_official 219:993c9b0acbcc 146 switch (mode) {
mbed_official 219:993c9b0acbcc 147 case 0:
mbed_official 219:993c9b0acbcc 148 obj->cpol = SPI_POLARITY_LOW;
mbed_official 219:993c9b0acbcc 149 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 219:993c9b0acbcc 150 break;
mbed_official 219:993c9b0acbcc 151 case 1:
mbed_official 219:993c9b0acbcc 152 obj->cpol = SPI_POLARITY_LOW;
mbed_official 219:993c9b0acbcc 153 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 219:993c9b0acbcc 154 break;
mbed_official 219:993c9b0acbcc 155 case 2:
mbed_official 219:993c9b0acbcc 156 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 219:993c9b0acbcc 157 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 219:993c9b0acbcc 158 break;
mbed_official 219:993c9b0acbcc 159 default:
mbed_official 219:993c9b0acbcc 160 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 219:993c9b0acbcc 161 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 219:993c9b0acbcc 162 break;
mbed_official 219:993c9b0acbcc 163 }
mbed_official 219:993c9b0acbcc 164
mbed_official 219:993c9b0acbcc 165 if (slave == 0) {
mbed_official 219:993c9b0acbcc 166 obj->mode = SPI_MODE_MASTER;
mbed_official 219:993c9b0acbcc 167 obj->nss = SPI_NSS_SOFT;
mbed_official 219:993c9b0acbcc 168 } else {
mbed_official 219:993c9b0acbcc 169 obj->mode = SPI_MODE_SLAVE;
mbed_official 219:993c9b0acbcc 170 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 219:993c9b0acbcc 171 }
mbed_official 219:993c9b0acbcc 172
mbed_official 219:993c9b0acbcc 173 init_spi(obj);
mbed_official 219:993c9b0acbcc 174 }
mbed_official 219:993c9b0acbcc 175
mbed_official 402:09075a3b15e3 176 void spi_frequency(spi_t *obj, int hz)
mbed_official 402:09075a3b15e3 177 {
mbed_official 219:993c9b0acbcc 178 // Note: The frequencies are obtained with SPI clock = 48 MHz (APB clock)
mbed_official 219:993c9b0acbcc 179 if (hz < 375000) {
mbed_official 219:993c9b0acbcc 180 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 188 kHz
mbed_official 219:993c9b0acbcc 181 } else if ((hz >= 375000) && (hz < 750000)) {
mbed_official 219:993c9b0acbcc 182 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz
mbed_official 219:993c9b0acbcc 183 } else if ((hz >= 750000) && (hz < 1000000)) {
mbed_official 219:993c9b0acbcc 184 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 750 kHz
mbed_official 219:993c9b0acbcc 185 } else if ((hz >= 1000000) && (hz < 3000000)) {
mbed_official 219:993c9b0acbcc 186 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz
mbed_official 219:993c9b0acbcc 187 } else if ((hz >= 3000000) && (hz < 6000000)) {
mbed_official 219:993c9b0acbcc 188 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz
mbed_official 219:993c9b0acbcc 189 } else if ((hz >= 6000000) && (hz < 12000000)) {
mbed_official 219:993c9b0acbcc 190 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz
mbed_official 219:993c9b0acbcc 191 } else if ((hz >= 12000000) && (hz < 24000000)) {
mbed_official 219:993c9b0acbcc 192 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz
mbed_official 219:993c9b0acbcc 193 } else { // >= 24000000
mbed_official 219:993c9b0acbcc 194 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz
mbed_official 219:993c9b0acbcc 195 }
mbed_official 404:cbc7dfcb0ce9 196
mbed_official 219:993c9b0acbcc 197 init_spi(obj);
mbed_official 219:993c9b0acbcc 198 }
mbed_official 219:993c9b0acbcc 199
mbed_official 402:09075a3b15e3 200 static inline int ssp_readable(spi_t *obj)
mbed_official 402:09075a3b15e3 201 {
mbed_official 219:993c9b0acbcc 202 int status;
mbed_official 219:993c9b0acbcc 203 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 204 // Check if data is received
mbed_official 219:993c9b0acbcc 205 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 219:993c9b0acbcc 206 return status;
mbed_official 219:993c9b0acbcc 207 }
mbed_official 219:993c9b0acbcc 208
mbed_official 402:09075a3b15e3 209 static inline int ssp_writeable(spi_t *obj)
mbed_official 402:09075a3b15e3 210 {
mbed_official 219:993c9b0acbcc 211 int status;
mbed_official 219:993c9b0acbcc 212 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 213 // Check if data is transmitted
mbed_official 219:993c9b0acbcc 214 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 219:993c9b0acbcc 215 return status;
mbed_official 219:993c9b0acbcc 216 }
mbed_official 219:993c9b0acbcc 217
mbed_official 402:09075a3b15e3 218 static inline void ssp_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 219 {
mbed_official 219:993c9b0acbcc 220 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 221 while (!ssp_writeable(obj));
mbed_official 335:6848febe3436 222 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 335:6848febe3436 223 // Force 8-bit access to the data register
mbed_official 219:993c9b0acbcc 224 uint8_t *p_spi_dr = 0;
mbed_official 219:993c9b0acbcc 225 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 219:993c9b0acbcc 226 *p_spi_dr = (uint8_t)value;
mbed_official 335:6848febe3436 227 } else { // SPI_DATASIZE_16BIT
mbed_official 219:993c9b0acbcc 228 spi->DR = (uint16_t)value;
mbed_official 219:993c9b0acbcc 229 }
mbed_official 219:993c9b0acbcc 230 }
mbed_official 219:993c9b0acbcc 231
mbed_official 402:09075a3b15e3 232 static inline int ssp_read(spi_t *obj)
mbed_official 402:09075a3b15e3 233 {
mbed_official 219:993c9b0acbcc 234 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 235 while (!ssp_readable(obj));
mbed_official 335:6848febe3436 236 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 335:6848febe3436 237 // Force 8-bit access to the data register
mbed_official 219:993c9b0acbcc 238 uint8_t *p_spi_dr = 0;
mbed_official 219:993c9b0acbcc 239 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 219:993c9b0acbcc 240 return (int)(*p_spi_dr);
mbed_official 219:993c9b0acbcc 241 } else {
mbed_official 219:993c9b0acbcc 242 return (int)spi->DR;
mbed_official 219:993c9b0acbcc 243 }
mbed_official 219:993c9b0acbcc 244 }
mbed_official 219:993c9b0acbcc 245
mbed_official 402:09075a3b15e3 246 static inline int ssp_busy(spi_t *obj)
mbed_official 402:09075a3b15e3 247 {
mbed_official 219:993c9b0acbcc 248 int status;
mbed_official 219:993c9b0acbcc 249 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 250 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 219:993c9b0acbcc 251 return status;
mbed_official 219:993c9b0acbcc 252 }
mbed_official 219:993c9b0acbcc 253
mbed_official 402:09075a3b15e3 254 int spi_master_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 255 {
mbed_official 219:993c9b0acbcc 256 ssp_write(obj, value);
mbed_official 219:993c9b0acbcc 257 return ssp_read(obj);
mbed_official 219:993c9b0acbcc 258 }
mbed_official 219:993c9b0acbcc 259
mbed_official 402:09075a3b15e3 260 int spi_slave_receive(spi_t *obj)
mbed_official 402:09075a3b15e3 261 {
mbed_official 233:1bbc1451db33 262 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
mbed_official 219:993c9b0acbcc 263 };
mbed_official 219:993c9b0acbcc 264
mbed_official 402:09075a3b15e3 265 int spi_slave_read(spi_t *obj)
mbed_official 402:09075a3b15e3 266 {
mbed_official 219:993c9b0acbcc 267 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 268 while (!ssp_readable(obj));
mbed_official 335:6848febe3436 269 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 335:6848febe3436 270 // Force 8-bit access to the data register
mbed_official 335:6848febe3436 271 uint8_t *p_spi_dr = 0;
mbed_official 335:6848febe3436 272 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 335:6848febe3436 273 return (int)(*p_spi_dr);
mbed_official 335:6848febe3436 274 } else {
mbed_official 335:6848febe3436 275 return (int)spi->DR;
mbed_official 335:6848febe3436 276 }
mbed_official 219:993c9b0acbcc 277 }
mbed_official 219:993c9b0acbcc 278
mbed_official 402:09075a3b15e3 279 void spi_slave_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 280 {
mbed_official 219:993c9b0acbcc 281 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 282 while (!ssp_writeable(obj));
mbed_official 335:6848febe3436 283 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 335:6848febe3436 284 // Force 8-bit access to the data register
mbed_official 335:6848febe3436 285 uint8_t *p_spi_dr = 0;
mbed_official 335:6848febe3436 286 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 335:6848febe3436 287 *p_spi_dr = (uint8_t)value;
mbed_official 335:6848febe3436 288 } else { // SPI_DATASIZE_16BIT
mbed_official 335:6848febe3436 289 spi->DR = (uint16_t)value;
mbed_official 335:6848febe3436 290 }
mbed_official 219:993c9b0acbcc 291 }
mbed_official 219:993c9b0acbcc 292
mbed_official 402:09075a3b15e3 293 int spi_busy(spi_t *obj)
mbed_official 402:09075a3b15e3 294 {
mbed_official 219:993c9b0acbcc 295 return ssp_busy(obj);
mbed_official 219:993c9b0acbcc 296 }
mbed_official 219:993c9b0acbcc 297
mbed_official 219:993c9b0acbcc 298 #endif