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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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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@402:09075a3b15e3, 2014-11-14 (annotated)

Committer:
mbed_official
Date:
Fri Nov 14 09:00:07 2014 +0000
Revision:
402:09075a3b15e3
Parent:
335:6848febe3436
Child:
404:cbc7dfcb0ce9
Synchronized with git revision dffeedc96e731e30785ca4a7842fb9769412bea1



Full URL: https://github.com/mbedmicro/mbed/commit/dffeedc96e731e30785ca4a7842fb9769412bea1/



Targets: add USBTX and USBRX pin definitions for targets that don't provide them

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 219:993c9b0acbcc 38
mbed_official 219:993c9b0acbcc 39 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 219:993c9b0acbcc 40 {PA_7, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 219:993c9b0acbcc 41 {PB_5, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 219:993c9b0acbcc 42 {PB_15, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI2)},
mbed_official 219:993c9b0acbcc 43 {PC_3, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_SPI2)},
mbed_official 219:993c9b0acbcc 44 {NC, NC, 0}
mbed_official 219:993c9b0acbcc 45 };
mbed_official 219:993c9b0acbcc 46
mbed_official 219:993c9b0acbcc 47 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 219:993c9b0acbcc 48 {PA_6, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 219:993c9b0acbcc 49 {PB_4, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 219:993c9b0acbcc 50 {PB_14, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI2)},
mbed_official 219:993c9b0acbcc 51 {PC_2, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_SPI2)},
mbed_official 219:993c9b0acbcc 52 {NC, NC, 0}
mbed_official 219:993c9b0acbcc 53 };
mbed_official 219:993c9b0acbcc 54
mbed_official 219:993c9b0acbcc 55 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 219:993c9b0acbcc 56 {PA_5, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 219:993c9b0acbcc 57 {PB_3, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 219:993c9b0acbcc 58 {PB_10, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 219:993c9b0acbcc 59 {PB_13, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI2)},
mbed_official 219:993c9b0acbcc 60 {NC, NC, 0}
mbed_official 219:993c9b0acbcc 61 };
mbed_official 219:993c9b0acbcc 62
mbed_official 219:993c9b0acbcc 63 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 219:993c9b0acbcc 64 {PA_4, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 219:993c9b0acbcc 65 {PA_15, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 219:993c9b0acbcc 66 {PB_9, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 219:993c9b0acbcc 67 {PB_12, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI2)},
mbed_official 219:993c9b0acbcc 68 {NC, NC, 0}
mbed_official 219:993c9b0acbcc 69 };
mbed_official 219:993c9b0acbcc 70
mbed_official 219:993c9b0acbcc 71 static SPI_HandleTypeDef SpiHandle;
mbed_official 219:993c9b0acbcc 72
mbed_official 402:09075a3b15e3 73 static void init_spi(spi_t *obj)
mbed_official 402:09075a3b15e3 74 {
mbed_official 219:993c9b0acbcc 75 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 76
mbed_official 219:993c9b0acbcc 77 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 219:993c9b0acbcc 78
mbed_official 219:993c9b0acbcc 79 SpiHandle.Init.Mode = obj->mode;
mbed_official 219:993c9b0acbcc 80 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 219:993c9b0acbcc 81 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 219:993c9b0acbcc 82 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 219:993c9b0acbcc 83 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 219:993c9b0acbcc 84 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 219:993c9b0acbcc 85 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 219:993c9b0acbcc 86 SpiHandle.Init.DataSize = obj->bits;
mbed_official 219:993c9b0acbcc 87 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 219:993c9b0acbcc 88 SpiHandle.Init.NSS = obj->nss;
mbed_official 219:993c9b0acbcc 89 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 219:993c9b0acbcc 90
mbed_official 219:993c9b0acbcc 91 HAL_SPI_Init(&SpiHandle);
mbed_official 219:993c9b0acbcc 92
mbed_official 219:993c9b0acbcc 93 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 219:993c9b0acbcc 94 }
mbed_official 219:993c9b0acbcc 95
mbed_official 402:09075a3b15e3 96 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
mbed_official 402:09075a3b15e3 97 {
mbed_official 219:993c9b0acbcc 98 // Determine the SPI to use
mbed_official 219:993c9b0acbcc 99 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 219:993c9b0acbcc 100 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 219:993c9b0acbcc 101 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 219:993c9b0acbcc 102 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 219:993c9b0acbcc 103
mbed_official 219:993c9b0acbcc 104 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 219:993c9b0acbcc 105 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 219:993c9b0acbcc 106
mbed_official 219:993c9b0acbcc 107 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 239:8cadf13dff33 108 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 219:993c9b0acbcc 109
mbed_official 219:993c9b0acbcc 110 // Enable SPI clock
mbed_official 219:993c9b0acbcc 111 if (obj->spi == SPI_1) {
mbed_official 219:993c9b0acbcc 112 __SPI1_CLK_ENABLE();
mbed_official 219:993c9b0acbcc 113 }
mbed_official 219:993c9b0acbcc 114 if (obj->spi == SPI_2) {
mbed_official 219:993c9b0acbcc 115 __SPI2_CLK_ENABLE();
mbed_official 219:993c9b0acbcc 116 }
mbed_official 219:993c9b0acbcc 117
mbed_official 219:993c9b0acbcc 118 // Configure the SPI pins
mbed_official 219:993c9b0acbcc 119 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 219:993c9b0acbcc 120 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 219:993c9b0acbcc 121 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 219:993c9b0acbcc 122
mbed_official 219:993c9b0acbcc 123 // Save new values
mbed_official 219:993c9b0acbcc 124 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 219:993c9b0acbcc 125 obj->cpol = SPI_POLARITY_LOW;
mbed_official 219:993c9b0acbcc 126 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 219:993c9b0acbcc 127 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
mbed_official 219:993c9b0acbcc 128
mbed_official 219:993c9b0acbcc 129 obj->pin_miso = miso;
mbed_official 219:993c9b0acbcc 130 obj->pin_mosi = mosi;
mbed_official 219:993c9b0acbcc 131 obj->pin_sclk = sclk;
mbed_official 219:993c9b0acbcc 132 obj->pin_ssel = ssel;
mbed_official 219:993c9b0acbcc 133
mbed_official 219:993c9b0acbcc 134 if (ssel == NC) { // SW NSS Master mode
mbed_official 219:993c9b0acbcc 135 obj->mode = SPI_MODE_MASTER;
mbed_official 219:993c9b0acbcc 136 obj->nss = SPI_NSS_SOFT;
mbed_official 219:993c9b0acbcc 137 } else { // Slave
mbed_official 219:993c9b0acbcc 138 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 219:993c9b0acbcc 139 obj->mode = SPI_MODE_SLAVE;
mbed_official 219:993c9b0acbcc 140 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 219:993c9b0acbcc 141 }
mbed_official 219:993c9b0acbcc 142
mbed_official 219:993c9b0acbcc 143 init_spi(obj);
mbed_official 219:993c9b0acbcc 144 }
mbed_official 219:993c9b0acbcc 145
mbed_official 402:09075a3b15e3 146 void spi_free(spi_t *obj)
mbed_official 402:09075a3b15e3 147 {
mbed_official 219:993c9b0acbcc 148 // Reset SPI and disable clock
mbed_official 219:993c9b0acbcc 149 if (obj->spi == SPI_1) {
mbed_official 219:993c9b0acbcc 150 __SPI1_FORCE_RESET();
mbed_official 219:993c9b0acbcc 151 __SPI1_RELEASE_RESET();
mbed_official 219:993c9b0acbcc 152 __SPI1_CLK_DISABLE();
mbed_official 219:993c9b0acbcc 153 }
mbed_official 219:993c9b0acbcc 154
mbed_official 219:993c9b0acbcc 155 if (obj->spi == SPI_2) {
mbed_official 219:993c9b0acbcc 156 __SPI2_FORCE_RESET();
mbed_official 219:993c9b0acbcc 157 __SPI2_RELEASE_RESET();
mbed_official 219:993c9b0acbcc 158 __SPI2_CLK_DISABLE();
mbed_official 219:993c9b0acbcc 159 }
mbed_official 219:993c9b0acbcc 160
mbed_official 219:993c9b0acbcc 161 // Configure GPIO
mbed_official 219:993c9b0acbcc 162 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 219:993c9b0acbcc 163 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 219:993c9b0acbcc 164 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 219:993c9b0acbcc 165 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 219:993c9b0acbcc 166 }
mbed_official 219:993c9b0acbcc 167
mbed_official 402:09075a3b15e3 168 void spi_format(spi_t *obj, int bits, int mode, int slave)
mbed_official 402:09075a3b15e3 169 {
mbed_official 219:993c9b0acbcc 170 // Save new values
mbed_official 219:993c9b0acbcc 171 if (bits == 16) {
mbed_official 219:993c9b0acbcc 172 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 219:993c9b0acbcc 173 } else {
mbed_official 219:993c9b0acbcc 174 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 219:993c9b0acbcc 175 }
mbed_official 219:993c9b0acbcc 176
mbed_official 219:993c9b0acbcc 177 switch (mode) {
mbed_official 219:993c9b0acbcc 178 case 0:
mbed_official 219:993c9b0acbcc 179 obj->cpol = SPI_POLARITY_LOW;
mbed_official 219:993c9b0acbcc 180 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 219:993c9b0acbcc 181 break;
mbed_official 219:993c9b0acbcc 182 case 1:
mbed_official 219:993c9b0acbcc 183 obj->cpol = SPI_POLARITY_LOW;
mbed_official 219:993c9b0acbcc 184 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 219:993c9b0acbcc 185 break;
mbed_official 219:993c9b0acbcc 186 case 2:
mbed_official 219:993c9b0acbcc 187 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 219:993c9b0acbcc 188 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 219:993c9b0acbcc 189 break;
mbed_official 219:993c9b0acbcc 190 default:
mbed_official 219:993c9b0acbcc 191 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 219:993c9b0acbcc 192 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 219:993c9b0acbcc 193 break;
mbed_official 219:993c9b0acbcc 194 }
mbed_official 219:993c9b0acbcc 195
mbed_official 219:993c9b0acbcc 196 if (slave == 0) {
mbed_official 219:993c9b0acbcc 197 obj->mode = SPI_MODE_MASTER;
mbed_official 219:993c9b0acbcc 198 obj->nss = SPI_NSS_SOFT;
mbed_official 219:993c9b0acbcc 199 } else {
mbed_official 219:993c9b0acbcc 200 obj->mode = SPI_MODE_SLAVE;
mbed_official 219:993c9b0acbcc 201 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 219:993c9b0acbcc 202 }
mbed_official 219:993c9b0acbcc 203
mbed_official 219:993c9b0acbcc 204 init_spi(obj);
mbed_official 219:993c9b0acbcc 205 }
mbed_official 219:993c9b0acbcc 206
mbed_official 402:09075a3b15e3 207 void spi_frequency(spi_t *obj, int hz)
mbed_official 402:09075a3b15e3 208 {
mbed_official 219:993c9b0acbcc 209 // Note: The frequencies are obtained with SPI clock = 48 MHz (APB clock)
mbed_official 219:993c9b0acbcc 210 if (hz < 375000) {
mbed_official 219:993c9b0acbcc 211 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 188 kHz
mbed_official 219:993c9b0acbcc 212 } else if ((hz >= 375000) && (hz < 750000)) {
mbed_official 219:993c9b0acbcc 213 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz
mbed_official 219:993c9b0acbcc 214 } else if ((hz >= 750000) && (hz < 1000000)) {
mbed_official 219:993c9b0acbcc 215 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 750 kHz
mbed_official 219:993c9b0acbcc 216 } else if ((hz >= 1000000) && (hz < 3000000)) {
mbed_official 219:993c9b0acbcc 217 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz
mbed_official 219:993c9b0acbcc 218 } else if ((hz >= 3000000) && (hz < 6000000)) {
mbed_official 219:993c9b0acbcc 219 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz
mbed_official 219:993c9b0acbcc 220 } else if ((hz >= 6000000) && (hz < 12000000)) {
mbed_official 219:993c9b0acbcc 221 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz
mbed_official 219:993c9b0acbcc 222 } else if ((hz >= 12000000) && (hz < 24000000)) {
mbed_official 219:993c9b0acbcc 223 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz
mbed_official 219:993c9b0acbcc 224 } else { // >= 24000000
mbed_official 219:993c9b0acbcc 225 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz
mbed_official 219:993c9b0acbcc 226 }
mbed_official 219:993c9b0acbcc 227 init_spi(obj);
mbed_official 219:993c9b0acbcc 228 }
mbed_official 219:993c9b0acbcc 229
mbed_official 402:09075a3b15e3 230 static inline int ssp_readable(spi_t *obj)
mbed_official 402:09075a3b15e3 231 {
mbed_official 219:993c9b0acbcc 232 int status;
mbed_official 219:993c9b0acbcc 233 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 234 // Check if data is received
mbed_official 219:993c9b0acbcc 235 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 219:993c9b0acbcc 236 return status;
mbed_official 219:993c9b0acbcc 237 }
mbed_official 219:993c9b0acbcc 238
mbed_official 402:09075a3b15e3 239 static inline int ssp_writeable(spi_t *obj)
mbed_official 402:09075a3b15e3 240 {
mbed_official 219:993c9b0acbcc 241 int status;
mbed_official 219:993c9b0acbcc 242 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 243 // Check if data is transmitted
mbed_official 219:993c9b0acbcc 244 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 219:993c9b0acbcc 245 return status;
mbed_official 219:993c9b0acbcc 246 }
mbed_official 219:993c9b0acbcc 247
mbed_official 402:09075a3b15e3 248 static inline void ssp_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 249 {
mbed_official 219:993c9b0acbcc 250 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 251 while (!ssp_writeable(obj));
mbed_official 335:6848febe3436 252 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 335:6848febe3436 253 // Force 8-bit access to the data register
mbed_official 219:993c9b0acbcc 254 uint8_t *p_spi_dr = 0;
mbed_official 219:993c9b0acbcc 255 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 219:993c9b0acbcc 256 *p_spi_dr = (uint8_t)value;
mbed_official 335:6848febe3436 257 } else { // SPI_DATASIZE_16BIT
mbed_official 219:993c9b0acbcc 258 spi->DR = (uint16_t)value;
mbed_official 219:993c9b0acbcc 259 }
mbed_official 219:993c9b0acbcc 260 }
mbed_official 219:993c9b0acbcc 261
mbed_official 402:09075a3b15e3 262 static inline int ssp_read(spi_t *obj)
mbed_official 402:09075a3b15e3 263 {
mbed_official 219:993c9b0acbcc 264 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 265 while (!ssp_readable(obj));
mbed_official 335:6848febe3436 266 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 335:6848febe3436 267 // Force 8-bit access to the data register
mbed_official 219:993c9b0acbcc 268 uint8_t *p_spi_dr = 0;
mbed_official 219:993c9b0acbcc 269 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 219:993c9b0acbcc 270 return (int)(*p_spi_dr);
mbed_official 219:993c9b0acbcc 271 } else {
mbed_official 219:993c9b0acbcc 272 return (int)spi->DR;
mbed_official 219:993c9b0acbcc 273 }
mbed_official 219:993c9b0acbcc 274 }
mbed_official 219:993c9b0acbcc 275
mbed_official 402:09075a3b15e3 276 static inline int ssp_busy(spi_t *obj)
mbed_official 402:09075a3b15e3 277 {
mbed_official 219:993c9b0acbcc 278 int status;
mbed_official 219:993c9b0acbcc 279 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 280 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 219:993c9b0acbcc 281 return status;
mbed_official 219:993c9b0acbcc 282 }
mbed_official 219:993c9b0acbcc 283
mbed_official 402:09075a3b15e3 284 int spi_master_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 285 {
mbed_official 219:993c9b0acbcc 286 ssp_write(obj, value);
mbed_official 219:993c9b0acbcc 287 return ssp_read(obj);
mbed_official 219:993c9b0acbcc 288 }
mbed_official 219:993c9b0acbcc 289
mbed_official 402:09075a3b15e3 290 int spi_slave_receive(spi_t *obj)
mbed_official 402:09075a3b15e3 291 {
mbed_official 233:1bbc1451db33 292 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
mbed_official 219:993c9b0acbcc 293 };
mbed_official 219:993c9b0acbcc 294
mbed_official 402:09075a3b15e3 295 int spi_slave_read(spi_t *obj)
mbed_official 402:09075a3b15e3 296 {
mbed_official 219:993c9b0acbcc 297 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 298 while (!ssp_readable(obj));
mbed_official 335:6848febe3436 299 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 335:6848febe3436 300 // Force 8-bit access to the data register
mbed_official 335:6848febe3436 301 uint8_t *p_spi_dr = 0;
mbed_official 335:6848febe3436 302 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 335:6848febe3436 303 return (int)(*p_spi_dr);
mbed_official 335:6848febe3436 304 } else {
mbed_official 335:6848febe3436 305 return (int)spi->DR;
mbed_official 335:6848febe3436 306 }
mbed_official 219:993c9b0acbcc 307 }
mbed_official 219:993c9b0acbcc 308
mbed_official 402:09075a3b15e3 309 void spi_slave_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 310 {
mbed_official 219:993c9b0acbcc 311 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 312 while (!ssp_writeable(obj));
mbed_official 335:6848febe3436 313 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 335:6848febe3436 314 // Force 8-bit access to the data register
mbed_official 335:6848febe3436 315 uint8_t *p_spi_dr = 0;
mbed_official 335:6848febe3436 316 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 335:6848febe3436 317 *p_spi_dr = (uint8_t)value;
mbed_official 335:6848febe3436 318 } else { // SPI_DATASIZE_16BIT
mbed_official 335:6848febe3436 319 spi->DR = (uint16_t)value;
mbed_official 335:6848febe3436 320 }
mbed_official 219:993c9b0acbcc 321 }
mbed_official 219:993c9b0acbcc 322
mbed_official 402:09075a3b15e3 323 int spi_busy(spi_t *obj)
mbed_official 402:09075a3b15e3 324 {
mbed_official 219:993c9b0acbcc 325 return ssp_busy(obj);
mbed_official 219:993c9b0acbcc 326 }
mbed_official 219:993c9b0acbcc 327
mbed_official 219:993c9b0acbcc 328 #endif