Ken Todotani / mbed-src

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targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/i2c_api.c@305:1f0269907d8b, 2014-08-29 (annotated)

Committer:
mbed_official
Date:
Fri Aug 29 20:45:07 2014 +0100
Revision:
305:1f0269907d8b
Parent:
247:135e3186a638 
Synchronized with git revision f304c6ba83591678388024d30440e94781fa8d65



Full URL: https://github.com/mbedmicro/mbed/commit/f304c6ba83591678388024d30440e94781fa8d65/



[NUCLEOs] enhance i2c api

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 87:085cde657901 1 /* mbed Microcontroller Library
mbed_official 87:085cde657901 2 *******************************************************************************
mbed_official 87:085cde657901 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 87:085cde657901 4 * All rights reserved.
mbed_official 87:085cde657901 5 *
mbed_official 87:085cde657901 6 * Redistribution and use in source and binary forms, with or without
mbed_official 87:085cde657901 7 * modification, are permitted provided that the following conditions are met:
mbed_official 87:085cde657901 8 *
mbed_official 87:085cde657901 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 87:085cde657901 10 * this list of conditions and the following disclaimer.
mbed_official 87:085cde657901 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 87:085cde657901 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 87:085cde657901 13 * and/or other materials provided with the distribution.
mbed_official 87:085cde657901 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 87:085cde657901 15 * may be used to endorse or promote products derived from this software
mbed_official 87:085cde657901 16 * without specific prior written permission.
mbed_official 87:085cde657901 17 *
mbed_official 87:085cde657901 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 87:085cde657901 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 87:085cde657901 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 87:085cde657901 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 87:085cde657901 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 87:085cde657901 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 87:085cde657901 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 87:085cde657901 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 87:085cde657901 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 87:085cde657901 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 87:085cde657901 28 *******************************************************************************
mbed_official 87:085cde657901 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 87:085cde657901 31 #include "i2c_api.h"
mbed_official 87:085cde657901 32
mbed_official 87:085cde657901 33 #if DEVICE_I2C
mbed_official 87:085cde657901 34
mbed_official 87:085cde657901 35 #include "cmsis.h"
mbed_official 87:085cde657901 36 #include "pinmap.h"
mbed_official 87:085cde657901 37
mbed_official 87:085cde657901 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 172:2f4f8c56b261 39 not based on accurate values, they just guarantee that the application will
mbed_official 172:2f4f8c56b261 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 87:085cde657901 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 87:085cde657901 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 87:085cde657901 43
mbed_official 87:085cde657901 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 115:4f0cb9cdc478 45 {PB_3, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF9_I2C2)},
mbed_official 115:4f0cb9cdc478 46 {PB_4, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF9_I2C3)},
mbed_official 125:23cc3068a9e4 47 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 125:23cc3068a9e4 48 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 125:23cc3068a9e4 49 {PC_9, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
mbed_official 87:085cde657901 50 {NC, NC, 0}
mbed_official 87:085cde657901 51 };
mbed_official 87:085cde657901 52
mbed_official 87:085cde657901 53 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 125:23cc3068a9e4 54 {PA_8, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
mbed_official 125:23cc3068a9e4 55 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 88:81f18c97d490 56 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 115:4f0cb9cdc478 57 {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 87:085cde657901 58 {NC, NC, 0}
mbed_official 87:085cde657901 59 };
mbed_official 87:085cde657901 60
mbed_official 87:085cde657901 61 I2C_HandleTypeDef I2cHandle;
mbed_official 87:085cde657901 62
mbed_official 305:1f0269907d8b 63 int i2c1_inited = 0;
mbed_official 305:1f0269907d8b 64 int i2c2_inited = 0;
mbed_official 305:1f0269907d8b 65 int i2c3_inited = 0;
mbed_official 305:1f0269907d8b 66
mbed_official 172:2f4f8c56b261 67 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 87:085cde657901 68 // Determine the I2C to use
mbed_official 87:085cde657901 69 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 87:085cde657901 70 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 87:085cde657901 71
mbed_official 87:085cde657901 72 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 73 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 87:085cde657901 74
mbed_official 305:1f0269907d8b 75 // Enable I2C1 clock and pinout if not done
mbed_official 305:1f0269907d8b 76 if ((obj->i2c == I2C_1)&& !i2c1_inited) {
mbed_official 305:1f0269907d8b 77 i2c1_inited = 1;
mbed_official 87:085cde657901 78 __I2C1_CLK_ENABLE();
mbed_official 305:1f0269907d8b 79 // Configure I2C pins
mbed_official 305:1f0269907d8b 80 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 81 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 82 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 83 pin_mode(scl, OpenDrain);
mbed_official 115:4f0cb9cdc478 84 }
mbed_official 305:1f0269907d8b 85 // Enable I2C2 clock and pinout if not done
mbed_official 305:1f0269907d8b 86 if ((obj->i2c == I2C_2)&& !i2c2_inited) {
mbed_official 305:1f0269907d8b 87 i2c2_inited = 1;
mbed_official 305:1f0269907d8b 88 __I2C2_CLK_ENABLE();
mbed_official 305:1f0269907d8b 89 // Configure I2C pins
mbed_official 305:1f0269907d8b 90 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 91 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 92 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 93 pin_mode(scl, OpenDrain);
mbed_official 115:4f0cb9cdc478 94 }
mbed_official 305:1f0269907d8b 95 // Enable I2C3 clock and pinout if not done
mbed_official 305:1f0269907d8b 96 if ((obj->i2c == I2C_3)&& !i2c3_inited) {
mbed_official 305:1f0269907d8b 97 i2c3_inited = 1;
mbed_official 305:1f0269907d8b 98 __I2C3_CLK_ENABLE();
mbed_official 305:1f0269907d8b 99 // Configure I2C pins
mbed_official 305:1f0269907d8b 100 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 101 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 102 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 103 pin_mode(scl, OpenDrain);
mbed_official 305:1f0269907d8b 104 }
mbed_official 172:2f4f8c56b261 105
mbed_official 87:085cde657901 106 // Reset to clear pending flags if any
mbed_official 87:085cde657901 107 i2c_reset(obj);
mbed_official 172:2f4f8c56b261 108
mbed_official 87:085cde657901 109 // I2C configuration
mbed_official 172:2f4f8c56b261 110 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 215:83cf97a28428 111
mbed_official 181:a4cbdfbbd2f4 112 // I2C master by default
mbed_official 181:a4cbdfbbd2f4 113 obj->slave = 0;
mbed_official 87:085cde657901 114 }
mbed_official 87:085cde657901 115
mbed_official 87:085cde657901 116 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 227:7bd0639b8911 117 MBED_ASSERT((hz != 0) && (hz <= 400000));
mbed_official 87:085cde657901 118 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 305:1f0269907d8b 119 int timeout;
mbed_official 305:1f0269907d8b 120
mbed_official 305:1f0269907d8b 121 // wait before init
mbed_official 305:1f0269907d8b 122 timeout = LONG_TIMEOUT;
mbed_official 305:1f0269907d8b 123 while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 172:2f4f8c56b261 124
mbed_official 227:7bd0639b8911 125 // I2C configuration
mbed_official 227:7bd0639b8911 126 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 227:7bd0639b8911 127 I2cHandle.Init.ClockSpeed = hz;
mbed_official 227:7bd0639b8911 128 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 227:7bd0639b8911 129 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
mbed_official 227:7bd0639b8911 130 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 227:7bd0639b8911 131 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 227:7bd0639b8911 132 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 227:7bd0639b8911 133 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 227:7bd0639b8911 134 HAL_I2C_Init(&I2cHandle);
mbed_official 227:7bd0639b8911 135 if (obj->slave) {
mbed_official 227:7bd0639b8911 136 /* Enable Address Acknowledge */
mbed_official 227:7bd0639b8911 137 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 87:085cde657901 138 }
mbed_official 227:7bd0639b8911 139
mbed_official 87:085cde657901 140 }
mbed_official 87:085cde657901 141
mbed_official 87:085cde657901 142 inline int i2c_start(i2c_t *obj) {
mbed_official 87:085cde657901 143 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 144 int timeout;
mbed_official 172:2f4f8c56b261 145
mbed_official 87:085cde657901 146 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 172:2f4f8c56b261 147
mbed_official 87:085cde657901 148 // Clear Acknowledge failure flag
mbed_official 87:085cde657901 149 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 172:2f4f8c56b261 150
mbed_official 87:085cde657901 151 // Generate the START condition
mbed_official 87:085cde657901 152 i2c->CR1 |= I2C_CR1_START;
mbed_official 172:2f4f8c56b261 153
mbed_official 87:085cde657901 154 // Wait the START condition has been correctly sent
mbed_official 87:085cde657901 155 timeout = FLAG_TIMEOUT;
mbed_official 87:085cde657901 156 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 172:2f4f8c56b261 157 if ((timeout--) == 0) {
mbed_official 172:2f4f8c56b261 158 return 1;
mbed_official 172:2f4f8c56b261 159 }
mbed_official 87:085cde657901 160 }
mbed_official 172:2f4f8c56b261 161
mbed_official 87:085cde657901 162 return 0;
mbed_official 87:085cde657901 163 }
mbed_official 87:085cde657901 164
mbed_official 87:085cde657901 165 inline int i2c_stop(i2c_t *obj) {
mbed_official 87:085cde657901 166 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 172:2f4f8c56b261 167
mbed_official 87:085cde657901 168 // Generate the STOP condition
mbed_official 87:085cde657901 169 i2c->CR1 |= I2C_CR1_STOP;
mbed_official 87:085cde657901 170
mbed_official 87:085cde657901 171 return 0;
mbed_official 87:085cde657901 172 }
mbed_official 87:085cde657901 173
mbed_official 172:2f4f8c56b261 174 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 183:46ae3190e86c 175 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 183:46ae3190e86c 176 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 183:46ae3190e86c 177 int timeout;
mbed_official 183:46ae3190e86c 178 int count;
mbed_official 183:46ae3190e86c 179 int value;
mbed_official 183:46ae3190e86c 180
mbed_official 183:46ae3190e86c 181 i2c_start(obj);
mbed_official 87:085cde657901 182
mbed_official 183:46ae3190e86c 183 // Wait until SB flag is set
mbed_official 183:46ae3190e86c 184 timeout = FLAG_TIMEOUT;
mbed_official 183:46ae3190e86c 185 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 183:46ae3190e86c 186 timeout--;
mbed_official 183:46ae3190e86c 187 if (timeout == 0) {
mbed_official 247:135e3186a638 188 return -1;
mbed_official 183:46ae3190e86c 189 }
mbed_official 87:085cde657901 190 }
mbed_official 215:83cf97a28428 191
mbed_official 215:83cf97a28428 192 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
mbed_official 215:83cf97a28428 193
mbed_official 215:83cf97a28428 194
mbed_official 183:46ae3190e86c 195 // Wait address is acknowledged
mbed_official 183:46ae3190e86c 196 timeout = FLAG_TIMEOUT;
mbed_official 183:46ae3190e86c 197 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 183:46ae3190e86c 198 timeout--;
mbed_official 183:46ae3190e86c 199 if (timeout == 0) {
mbed_official 247:135e3186a638 200 return -1;
mbed_official 183:46ae3190e86c 201 }
mbed_official 183:46ae3190e86c 202 }
mbed_official 183:46ae3190e86c 203 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 183:46ae3190e86c 204
mbed_official 183:46ae3190e86c 205 // Read all bytes except last one
mbed_official 183:46ae3190e86c 206 for (count = 0; count < (length - 1); count++) {
mbed_official 183:46ae3190e86c 207 value = i2c_byte_read(obj, 0);
mbed_official 183:46ae3190e86c 208 data[count] = (char)value;
mbed_official 183:46ae3190e86c 209 }
mbed_official 183:46ae3190e86c 210
mbed_official 183:46ae3190e86c 211 // If not repeated start, send stop.
mbed_official 183:46ae3190e86c 212 // Warning: must be done BEFORE the data is read.
mbed_official 183:46ae3190e86c 213 if (stop) {
mbed_official 183:46ae3190e86c 214 i2c_stop(obj);
mbed_official 183:46ae3190e86c 215 }
mbed_official 183:46ae3190e86c 216
mbed_official 183:46ae3190e86c 217 // Read the last byte
mbed_official 183:46ae3190e86c 218 value = i2c_byte_read(obj, 1);
mbed_official 183:46ae3190e86c 219 data[count] = (char)value;
mbed_official 87:085cde657901 220
mbed_official 87:085cde657901 221 return length;
mbed_official 87:085cde657901 222 }
mbed_official 87:085cde657901 223
mbed_official 87:085cde657901 224 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 183:46ae3190e86c 225 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 183:46ae3190e86c 226 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 183:46ae3190e86c 227 int timeout;
mbed_official 183:46ae3190e86c 228 int count;
mbed_official 172:2f4f8c56b261 229
mbed_official 183:46ae3190e86c 230 i2c_start(obj);
mbed_official 87:085cde657901 231
mbed_official 183:46ae3190e86c 232 // Wait until SB flag is set
mbed_official 183:46ae3190e86c 233 timeout = FLAG_TIMEOUT;
mbed_official 183:46ae3190e86c 234 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 183:46ae3190e86c 235 timeout--;
mbed_official 183:46ae3190e86c 236 if (timeout == 0) {
mbed_official 247:135e3186a638 237 return -1;
mbed_official 183:46ae3190e86c 238 }
mbed_official 183:46ae3190e86c 239 }
mbed_official 215:83cf97a28428 240
mbed_official 183:46ae3190e86c 241 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
mbed_official 215:83cf97a28428 242
mbed_official 183:46ae3190e86c 243
mbed_official 183:46ae3190e86c 244 // Wait address is acknowledged
mbed_official 183:46ae3190e86c 245 timeout = FLAG_TIMEOUT;
mbed_official 183:46ae3190e86c 246 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 183:46ae3190e86c 247 timeout--;
mbed_official 183:46ae3190e86c 248 if (timeout == 0) {
mbed_official 247:135e3186a638 249 return -1;
mbed_official 183:46ae3190e86c 250 }
mbed_official 183:46ae3190e86c 251 }
mbed_official 183:46ae3190e86c 252 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 215:83cf97a28428 253
mbed_official 183:46ae3190e86c 254 for (count = 0; count < length; count++) {
mbed_official 183:46ae3190e86c 255 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 183:46ae3190e86c 256 i2c_stop(obj);
mbed_official 247:135e3186a638 257 return -1;
mbed_official 183:46ae3190e86c 258 }
mbed_official 87:085cde657901 259 }
mbed_official 172:2f4f8c56b261 260
mbed_official 183:46ae3190e86c 261 // If not repeated start, send stop.
mbed_official 183:46ae3190e86c 262 if (stop) {
mbed_official 183:46ae3190e86c 263 i2c_stop(obj);
mbed_official 183:46ae3190e86c 264 }
mbed_official 183:46ae3190e86c 265
mbed_official 183:46ae3190e86c 266 return count;
mbed_official 87:085cde657901 267 }
mbed_official 87:085cde657901 268
mbed_official 87:085cde657901 269 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 87:085cde657901 270 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 271 int timeout;
mbed_official 172:2f4f8c56b261 272
mbed_official 87:085cde657901 273 if (last) {
mbed_official 87:085cde657901 274 // Don't acknowledge the last byte
mbed_official 87:085cde657901 275 i2c->CR1 &= ~I2C_CR1_ACK;
mbed_official 87:085cde657901 276 } else {
mbed_official 87:085cde657901 277 // Acknowledge the byte
mbed_official 87:085cde657901 278 i2c->CR1 |= I2C_CR1_ACK;
mbed_official 87:085cde657901 279 }
mbed_official 87:085cde657901 280
mbed_official 87:085cde657901 281 // Wait until the byte is received
mbed_official 87:085cde657901 282 timeout = FLAG_TIMEOUT;
mbed_official 87:085cde657901 283 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 172:2f4f8c56b261 284 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 285 return -1;
mbed_official 172:2f4f8c56b261 286 }
mbed_official 87:085cde657901 287 }
mbed_official 172:2f4f8c56b261 288
mbed_official 87:085cde657901 289 return (int)i2c->DR;
mbed_official 87:085cde657901 290 }
mbed_official 87:085cde657901 291
mbed_official 87:085cde657901 292 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 87:085cde657901 293 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 294 int timeout;
mbed_official 87:085cde657901 295
mbed_official 87:085cde657901 296 i2c->DR = (uint8_t)data;
mbed_official 87:085cde657901 297
mbed_official 87:085cde657901 298 // Wait until the byte is transmitted
mbed_official 172:2f4f8c56b261 299 timeout = FLAG_TIMEOUT;
mbed_official 87:085cde657901 300 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
mbed_official 215:83cf97a28428 301 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
mbed_official 87:085cde657901 302 if ((timeout--) == 0) {
mbed_official 87:085cde657901 303 return 0;
mbed_official 87:085cde657901 304 }
mbed_official 87:085cde657901 305 }
mbed_official 172:2f4f8c56b261 306
mbed_official 87:085cde657901 307 return 1;
mbed_official 87:085cde657901 308 }
mbed_official 87:085cde657901 309
mbed_official 87:085cde657901 310 void i2c_reset(i2c_t *obj) {
mbed_official 305:1f0269907d8b 311 int timeout;
mbed_official 305:1f0269907d8b 312
mbed_official 305:1f0269907d8b 313 // wait before reset
mbed_official 305:1f0269907d8b 314 timeout = LONG_TIMEOUT;
mbed_official 305:1f0269907d8b 315 while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 305:1f0269907d8b 316
mbed_official 172:2f4f8c56b261 317 if (obj->i2c == I2C_1) {
mbed_official 87:085cde657901 318 __I2C1_FORCE_RESET();
mbed_official 87:085cde657901 319 __I2C1_RELEASE_RESET();
mbed_official 87:085cde657901 320 }
mbed_official 115:4f0cb9cdc478 321 if (obj->i2c == I2C_2) {
mbed_official 115:4f0cb9cdc478 322 __I2C2_FORCE_RESET();
mbed_official 115:4f0cb9cdc478 323 __I2C2_RELEASE_RESET();
mbed_official 115:4f0cb9cdc478 324 }
mbed_official 115:4f0cb9cdc478 325 if (obj->i2c == I2C_3) {
mbed_official 115:4f0cb9cdc478 326 __I2C3_FORCE_RESET();
mbed_official 115:4f0cb9cdc478 327 __I2C3_RELEASE_RESET();
mbed_official 115:4f0cb9cdc478 328 }
mbed_official 87:085cde657901 329 }
mbed_official 87:085cde657901 330
mbed_official 87:085cde657901 331 #if DEVICE_I2CSLAVE
mbed_official 87:085cde657901 332
mbed_official 87:085cde657901 333 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 87:085cde657901 334 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 335 uint16_t tmpreg = 0;
mbed_official 87:085cde657901 336
mbed_official 87:085cde657901 337 // Get the old register value
mbed_official 87:085cde657901 338 tmpreg = i2c->OAR1;
mbed_official 87:085cde657901 339 // Reset address bits
mbed_official 87:085cde657901 340 tmpreg &= 0xFC00;
mbed_official 87:085cde657901 341 // Set new address
mbed_official 87:085cde657901 342 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 87:085cde657901 343 // Store the new register value
mbed_official 87:085cde657901 344 i2c->OAR1 = tmpreg;
mbed_official 87:085cde657901 345 }
mbed_official 87:085cde657901 346
mbed_official 87:085cde657901 347 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 181:a4cbdfbbd2f4 348 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 215:83cf97a28428 349 if (enable_slave) {
mbed_official 181:a4cbdfbbd2f4 350 obj->slave = 1;
mbed_official 181:a4cbdfbbd2f4 351 /* Enable Address Acknowledge */
mbed_official 181:a4cbdfbbd2f4 352 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 181:a4cbdfbbd2f4 353 }
mbed_official 87:085cde657901 354 }
mbed_official 87:085cde657901 355
mbed_official 87:085cde657901 356 // See I2CSlave.h
mbed_official 87:085cde657901 357 #define NoData 0 // the slave has not been addressed
mbed_official 87:085cde657901 358 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 87:085cde657901 359 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 87:085cde657901 360 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 87:085cde657901 361
mbed_official 87:085cde657901 362 int i2c_slave_receive(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 363 int retValue = NoData;
mbed_official 215:83cf97a28428 364
mbed_official 215:83cf97a28428 365 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 215:83cf97a28428 366 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 215:83cf97a28428 367 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1)
mbed_official 215:83cf97a28428 368 retValue = ReadAddressed;
mbed_official 181:a4cbdfbbd2f4 369 else
mbed_official 215:83cf97a28428 370 retValue = WriteAddressed;
mbed_official 215:83cf97a28428 371
mbed_official 181:a4cbdfbbd2f4 372 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 215:83cf97a28428 373 }
mbed_official 181:a4cbdfbbd2f4 374 }
mbed_official 215:83cf97a28428 375
mbed_official 215:83cf97a28428 376 return (retValue);
mbed_official 87:085cde657901 377 }
mbed_official 87:085cde657901 378
mbed_official 87:085cde657901 379 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 181:a4cbdfbbd2f4 380 uint32_t Timeout;
mbed_official 181:a4cbdfbbd2f4 381 int size = 0;
mbed_official 172:2f4f8c56b261 382
mbed_official 87:085cde657901 383 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 384
mbed_official 215:83cf97a28428 385 while (length > 0) {
mbed_official 181:a4cbdfbbd2f4 386 /* Wait until RXNE flag is set */
mbed_official 181:a4cbdfbbd2f4 387 // Wait until the byte is received
mbed_official 181:a4cbdfbbd2f4 388 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 389 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 390 Timeout--;
mbed_official 181:a4cbdfbbd2f4 391 if (Timeout == 0) {
mbed_official 247:135e3186a638 392 return -1;
mbed_official 181:a4cbdfbbd2f4 393 }
mbed_official 215:83cf97a28428 394 }
mbed_official 181:a4cbdfbbd2f4 395
mbed_official 181:a4cbdfbbd2f4 396 /* Read data from DR */
mbed_official 181:a4cbdfbbd2f4 397 (*data++) = I2cHandle.Instance->DR;
mbed_official 181:a4cbdfbbd2f4 398 length--;
mbed_official 181:a4cbdfbbd2f4 399 size++;
mbed_official 181:a4cbdfbbd2f4 400
mbed_official 215:83cf97a28428 401 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 181:a4cbdfbbd2f4 402 /* Read data from DR */
mbed_official 181:a4cbdfbbd2f4 403 (*data++) = I2cHandle.Instance->DR;
mbed_official 181:a4cbdfbbd2f4 404 length--;
mbed_official 181:a4cbdfbbd2f4 405 size++;
mbed_official 181:a4cbdfbbd2f4 406 }
mbed_official 87:085cde657901 407 }
mbed_official 87:085cde657901 408
mbed_official 181:a4cbdfbbd2f4 409 /* Wait until STOP flag is set */
mbed_official 181:a4cbdfbbd2f4 410 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 411 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 181:a4cbdfbbd2f4 412 Timeout--;
mbed_official 181:a4cbdfbbd2f4 413 if (Timeout == 0) {
mbed_official 247:135e3186a638 414 return -1;
mbed_official 181:a4cbdfbbd2f4 415 }
mbed_official 215:83cf97a28428 416 }
mbed_official 215:83cf97a28428 417
mbed_official 181:a4cbdfbbd2f4 418 /* Clear STOP flag */
mbed_official 181:a4cbdfbbd2f4 419 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
mbed_official 181:a4cbdfbbd2f4 420
mbed_official 181:a4cbdfbbd2f4 421 /* Wait until BUSY flag is reset */
mbed_official 181:a4cbdfbbd2f4 422 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 423 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 181:a4cbdfbbd2f4 424 Timeout--;
mbed_official 181:a4cbdfbbd2f4 425 if (Timeout == 0) {
mbed_official 247:135e3186a638 426 return -1;
mbed_official 181:a4cbdfbbd2f4 427 }
mbed_official 181:a4cbdfbbd2f4 428 }
mbed_official 181:a4cbdfbbd2f4 429
mbed_official 181:a4cbdfbbd2f4 430 return size;
mbed_official 87:085cde657901 431 }
mbed_official 87:085cde657901 432
mbed_official 87:085cde657901 433 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 181:a4cbdfbbd2f4 434 uint32_t Timeout;
mbed_official 181:a4cbdfbbd2f4 435 int size = 0;
mbed_official 172:2f4f8c56b261 436
mbed_official 87:085cde657901 437 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 438
mbed_official 215:83cf97a28428 439 while (length > 0) {
mbed_official 181:a4cbdfbbd2f4 440 /* Wait until TXE flag is set */
mbed_official 181:a4cbdfbbd2f4 441 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 442 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 443 Timeout--;
mbed_official 181:a4cbdfbbd2f4 444 if (Timeout == 0) {
mbed_official 247:135e3186a638 445 return -1;
mbed_official 181:a4cbdfbbd2f4 446 }
mbed_official 215:83cf97a28428 447 }
mbed_official 181:a4cbdfbbd2f4 448
mbed_official 181:a4cbdfbbd2f4 449
mbed_official 181:a4cbdfbbd2f4 450 /* Write data to DR */
mbed_official 181:a4cbdfbbd2f4 451 I2cHandle.Instance->DR = (*data++);
mbed_official 181:a4cbdfbbd2f4 452 length--;
mbed_official 181:a4cbdfbbd2f4 453 size++;
mbed_official 215:83cf97a28428 454
mbed_official 215:83cf97a28428 455 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 215:83cf97a28428 456 /* Write data to DR */
mbed_official 215:83cf97a28428 457 I2cHandle.Instance->DR = (*data++);
mbed_official 215:83cf97a28428 458 length--;
mbed_official 215:83cf97a28428 459 size++;
mbed_official 215:83cf97a28428 460 }
mbed_official 181:a4cbdfbbd2f4 461 }
mbed_official 215:83cf97a28428 462
mbed_official 181:a4cbdfbbd2f4 463 /* Wait until AF flag is set */
mbed_official 181:a4cbdfbbd2f4 464 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 465 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
mbed_official 181:a4cbdfbbd2f4 466 Timeout--;
mbed_official 181:a4cbdfbbd2f4 467 if (Timeout == 0) {
mbed_official 247:135e3186a638 468 return -1;
mbed_official 181:a4cbdfbbd2f4 469 }
mbed_official 215:83cf97a28428 470 }
mbed_official 181:a4cbdfbbd2f4 471
mbed_official 215:83cf97a28428 472
mbed_official 181:a4cbdfbbd2f4 473 /* Clear AF flag */
mbed_official 181:a4cbdfbbd2f4 474 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 181:a4cbdfbbd2f4 475
mbed_official 181:a4cbdfbbd2f4 476
mbed_official 181:a4cbdfbbd2f4 477 /* Wait until BUSY flag is reset */
mbed_official 181:a4cbdfbbd2f4 478 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 479 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 181:a4cbdfbbd2f4 480 Timeout--;
mbed_official 181:a4cbdfbbd2f4 481 if (Timeout == 0) {
mbed_official 247:135e3186a638 482 return -1;
mbed_official 181:a4cbdfbbd2f4 483 }
mbed_official 87:085cde657901 484 }
mbed_official 87:085cde657901 485
mbed_official 181:a4cbdfbbd2f4 486 I2cHandle.State = HAL_I2C_STATE_READY;
mbed_official 181:a4cbdfbbd2f4 487
mbed_official 181:a4cbdfbbd2f4 488 /* Process Unlocked */
mbed_official 181:a4cbdfbbd2f4 489 __HAL_UNLOCK(&I2cHandle);
mbed_official 181:a4cbdfbbd2f4 490
mbed_official 181:a4cbdfbbd2f4 491 return size;
mbed_official 87:085cde657901 492 }
mbed_official 87:085cde657901 493
mbed_official 87:085cde657901 494
mbed_official 87:085cde657901 495 #endif // DEVICE_I2CSLAVE
mbed_official 87:085cde657901 496
mbed_official 87:085cde657901 497 #endif // DEVICE_I2C