Ken Todotani / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/i2c_api.c@215:83cf97a28428, 2014-05-27 (annotated)

Committer:
mbed_official
Date:
Tue May 27 08:30:06 2014 +0100
Revision:
215:83cf97a28428
Parent:
185:e752b4ee7de1
Child:
227:7bd0639b8911
Synchronized with git revision a8b7f5df2cb5d7a76fda549a15b91fdaba6e2986



Full URL: https://github.com/mbedmicro/mbed/commit/a8b7f5df2cb5d7a76fda549a15b91fdaba6e2986/



[KLXX] Added RPC + RTOS support (KL05Z)

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 87:085cde657901 30 #include "i2c_api.h"
mbed_official 87:085cde657901 31
mbed_official 87:085cde657901 32 #if DEVICE_I2C
mbed_official 87:085cde657901 33
mbed_official 87:085cde657901 34 #include "cmsis.h"
mbed_official 87:085cde657901 35 #include "pinmap.h"
mbed_official 87:085cde657901 36 #include "error.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 172:2f4f8c56b261 63 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 87:085cde657901 64 // Determine the I2C to use
mbed_official 87:085cde657901 65 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 87:085cde657901 66 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 87:085cde657901 67
mbed_official 87:085cde657901 68 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 172:2f4f8c56b261 69
mbed_official 87:085cde657901 70 if (obj->i2c == (I2CName)NC) {
mbed_official 87:085cde657901 71 error("I2C error: pinout mapping failed.");
mbed_official 87:085cde657901 72 }
mbed_official 87:085cde657901 73
mbed_official 87:085cde657901 74 // Enable I2C clock
mbed_official 172:2f4f8c56b261 75 if (obj->i2c == I2C_1) {
mbed_official 87:085cde657901 76 __I2C1_CLK_ENABLE();
mbed_official 87:085cde657901 77 }
mbed_official 115:4f0cb9cdc478 78 if (obj->i2c == I2C_2) {
mbed_official 115:4f0cb9cdc478 79 __I2C2_CLK_ENABLE();
mbed_official 115:4f0cb9cdc478 80 }
mbed_official 115:4f0cb9cdc478 81 if (obj->i2c == I2C_3) {
mbed_official 115:4f0cb9cdc478 82 __I2C3_CLK_ENABLE();
mbed_official 115:4f0cb9cdc478 83 }
mbed_official 87:085cde657901 84
mbed_official 87:085cde657901 85 // Configure I2C pins
mbed_official 87:085cde657901 86 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 87:085cde657901 87 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 87:085cde657901 88 pin_mode(sda, OpenDrain);
mbed_official 87:085cde657901 89 pin_mode(scl, OpenDrain);
mbed_official 172:2f4f8c56b261 90
mbed_official 87:085cde657901 91 // Reset to clear pending flags if any
mbed_official 87:085cde657901 92 i2c_reset(obj);
mbed_official 172:2f4f8c56b261 93
mbed_official 87:085cde657901 94 // I2C configuration
mbed_official 172:2f4f8c56b261 95 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 215:83cf97a28428 96
mbed_official 181:a4cbdfbbd2f4 97 // I2C master by default
mbed_official 181:a4cbdfbbd2f4 98 obj->slave = 0;
mbed_official 87:085cde657901 99 }
mbed_official 87:085cde657901 100
mbed_official 87:085cde657901 101 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 87:085cde657901 102 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 172:2f4f8c56b261 103
mbed_official 87:085cde657901 104 if ((hz != 0) && (hz <= 400000)) {
mbed_official 185:e752b4ee7de1 105 // I2C configuration
mbed_official 87:085cde657901 106 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 87:085cde657901 107 I2cHandle.Init.ClockSpeed = hz;
mbed_official 87:085cde657901 108 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 87:085cde657901 109 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
mbed_official 87:085cde657901 110 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 87:085cde657901 111 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 87:085cde657901 112 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 87:085cde657901 113 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 215:83cf97a28428 114 HAL_I2C_Init(&I2cHandle);
mbed_official 215:83cf97a28428 115 if (obj->slave) {
mbed_official 181:a4cbdfbbd2f4 116 /* Enable Address Acknowledge */
mbed_official 181:a4cbdfbbd2f4 117 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 215:83cf97a28428 118 }
mbed_official 185:e752b4ee7de1 119 } else {
mbed_official 87:085cde657901 120 error("I2C error: frequency setting failed (max 400kHz).");
mbed_official 87:085cde657901 121 }
mbed_official 87:085cde657901 122 }
mbed_official 87:085cde657901 123
mbed_official 87:085cde657901 124 inline int i2c_start(i2c_t *obj) {
mbed_official 87:085cde657901 125 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 126 int timeout;
mbed_official 172:2f4f8c56b261 127
mbed_official 87:085cde657901 128 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 172:2f4f8c56b261 129
mbed_official 87:085cde657901 130 // Clear Acknowledge failure flag
mbed_official 87:085cde657901 131 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 172:2f4f8c56b261 132
mbed_official 87:085cde657901 133 // Generate the START condition
mbed_official 87:085cde657901 134 i2c->CR1 |= I2C_CR1_START;
mbed_official 172:2f4f8c56b261 135
mbed_official 87:085cde657901 136 // Wait the START condition has been correctly sent
mbed_official 87:085cde657901 137 timeout = FLAG_TIMEOUT;
mbed_official 87:085cde657901 138 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 172:2f4f8c56b261 139 if ((timeout--) == 0) {
mbed_official 172:2f4f8c56b261 140 return 1;
mbed_official 172:2f4f8c56b261 141 }
mbed_official 87:085cde657901 142 }
mbed_official 172:2f4f8c56b261 143
mbed_official 87:085cde657901 144 return 0;
mbed_official 87:085cde657901 145 }
mbed_official 87:085cde657901 146
mbed_official 87:085cde657901 147 inline int i2c_stop(i2c_t *obj) {
mbed_official 87:085cde657901 148 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 172:2f4f8c56b261 149
mbed_official 87:085cde657901 150 // Generate the STOP condition
mbed_official 87:085cde657901 151 i2c->CR1 |= I2C_CR1_STOP;
mbed_official 87:085cde657901 152
mbed_official 87:085cde657901 153 return 0;
mbed_official 87:085cde657901 154 }
mbed_official 87:085cde657901 155
mbed_official 172:2f4f8c56b261 156 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 183:46ae3190e86c 157 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 183:46ae3190e86c 158 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 183:46ae3190e86c 159 int timeout;
mbed_official 183:46ae3190e86c 160 int count;
mbed_official 183:46ae3190e86c 161 int value;
mbed_official 183:46ae3190e86c 162
mbed_official 87:085cde657901 163 if (length == 0) return 0;
mbed_official 172:2f4f8c56b261 164
mbed_official 183:46ae3190e86c 165 i2c_start(obj);
mbed_official 87:085cde657901 166
mbed_official 183:46ae3190e86c 167 // Wait until SB flag is set
mbed_official 183:46ae3190e86c 168 timeout = FLAG_TIMEOUT;
mbed_official 183:46ae3190e86c 169 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 183:46ae3190e86c 170 timeout--;
mbed_official 183:46ae3190e86c 171 if (timeout == 0) {
mbed_official 183:46ae3190e86c 172 return 0;
mbed_official 183:46ae3190e86c 173 }
mbed_official 87:085cde657901 174 }
mbed_official 215:83cf97a28428 175
mbed_official 215:83cf97a28428 176 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
mbed_official 215:83cf97a28428 177
mbed_official 215:83cf97a28428 178
mbed_official 183:46ae3190e86c 179 // Wait address is acknowledged
mbed_official 183:46ae3190e86c 180 timeout = FLAG_TIMEOUT;
mbed_official 183:46ae3190e86c 181 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 183:46ae3190e86c 182 timeout--;
mbed_official 183:46ae3190e86c 183 if (timeout == 0) {
mbed_official 183:46ae3190e86c 184 return 0;
mbed_official 183:46ae3190e86c 185 }
mbed_official 183:46ae3190e86c 186 }
mbed_official 183:46ae3190e86c 187 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 183:46ae3190e86c 188
mbed_official 183:46ae3190e86c 189 // Read all bytes except last one
mbed_official 183:46ae3190e86c 190 for (count = 0; count < (length - 1); count++) {
mbed_official 183:46ae3190e86c 191 value = i2c_byte_read(obj, 0);
mbed_official 183:46ae3190e86c 192 data[count] = (char)value;
mbed_official 183:46ae3190e86c 193 }
mbed_official 183:46ae3190e86c 194
mbed_official 183:46ae3190e86c 195 // If not repeated start, send stop.
mbed_official 183:46ae3190e86c 196 // Warning: must be done BEFORE the data is read.
mbed_official 183:46ae3190e86c 197 if (stop) {
mbed_official 183:46ae3190e86c 198 i2c_stop(obj);
mbed_official 183:46ae3190e86c 199 }
mbed_official 183:46ae3190e86c 200
mbed_official 183:46ae3190e86c 201 // Read the last byte
mbed_official 183:46ae3190e86c 202 value = i2c_byte_read(obj, 1);
mbed_official 183:46ae3190e86c 203 data[count] = (char)value;
mbed_official 87:085cde657901 204
mbed_official 87:085cde657901 205 return length;
mbed_official 87:085cde657901 206 }
mbed_official 87:085cde657901 207
mbed_official 87:085cde657901 208 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 183:46ae3190e86c 209 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 183:46ae3190e86c 210 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 183:46ae3190e86c 211 int timeout;
mbed_official 183:46ae3190e86c 212 int count;
mbed_official 172:2f4f8c56b261 213
mbed_official 183:46ae3190e86c 214 if (length == 0) return 0;
mbed_official 183:46ae3190e86c 215 i2c_start(obj);
mbed_official 87:085cde657901 216
mbed_official 183:46ae3190e86c 217 // Wait until SB flag is set
mbed_official 183:46ae3190e86c 218 timeout = FLAG_TIMEOUT;
mbed_official 183:46ae3190e86c 219 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 183:46ae3190e86c 220 timeout--;
mbed_official 183:46ae3190e86c 221 if (timeout == 0) {
mbed_official 183:46ae3190e86c 222 return 0;
mbed_official 183:46ae3190e86c 223 }
mbed_official 183:46ae3190e86c 224 }
mbed_official 215:83cf97a28428 225
mbed_official 183:46ae3190e86c 226 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
mbed_official 215:83cf97a28428 227
mbed_official 183:46ae3190e86c 228
mbed_official 183:46ae3190e86c 229 // Wait address is acknowledged
mbed_official 183:46ae3190e86c 230 timeout = FLAG_TIMEOUT;
mbed_official 183:46ae3190e86c 231 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 183:46ae3190e86c 232 timeout--;
mbed_official 183:46ae3190e86c 233 if (timeout == 0) {
mbed_official 183:46ae3190e86c 234 return 0;
mbed_official 183:46ae3190e86c 235 }
mbed_official 183:46ae3190e86c 236 }
mbed_official 183:46ae3190e86c 237 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 215:83cf97a28428 238
mbed_official 183:46ae3190e86c 239 for (count = 0; count < length; count++) {
mbed_official 183:46ae3190e86c 240 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 183:46ae3190e86c 241 i2c_stop(obj);
mbed_official 183:46ae3190e86c 242 return 0;
mbed_official 183:46ae3190e86c 243 }
mbed_official 87:085cde657901 244 }
mbed_official 172:2f4f8c56b261 245
mbed_official 183:46ae3190e86c 246 // If not repeated start, send stop.
mbed_official 183:46ae3190e86c 247 if (stop) {
mbed_official 183:46ae3190e86c 248 i2c_stop(obj);
mbed_official 183:46ae3190e86c 249 }
mbed_official 183:46ae3190e86c 250
mbed_official 183:46ae3190e86c 251 return count;
mbed_official 87:085cde657901 252 }
mbed_official 87:085cde657901 253
mbed_official 87:085cde657901 254 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 87:085cde657901 255 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 256 int timeout;
mbed_official 172:2f4f8c56b261 257
mbed_official 87:085cde657901 258 if (last) {
mbed_official 87:085cde657901 259 // Don't acknowledge the last byte
mbed_official 87:085cde657901 260 i2c->CR1 &= ~I2C_CR1_ACK;
mbed_official 87:085cde657901 261 } else {
mbed_official 87:085cde657901 262 // Acknowledge the byte
mbed_official 87:085cde657901 263 i2c->CR1 |= I2C_CR1_ACK;
mbed_official 87:085cde657901 264 }
mbed_official 87:085cde657901 265
mbed_official 87:085cde657901 266 // Wait until the byte is received
mbed_official 87:085cde657901 267 timeout = FLAG_TIMEOUT;
mbed_official 87:085cde657901 268 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 172:2f4f8c56b261 269 if ((timeout--) == 0) {
mbed_official 172:2f4f8c56b261 270 return 0;
mbed_official 172:2f4f8c56b261 271 }
mbed_official 87:085cde657901 272 }
mbed_official 172:2f4f8c56b261 273
mbed_official 87:085cde657901 274 return (int)i2c->DR;
mbed_official 87:085cde657901 275 }
mbed_official 87:085cde657901 276
mbed_official 87:085cde657901 277 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 87:085cde657901 278 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 279 int timeout;
mbed_official 87:085cde657901 280
mbed_official 87:085cde657901 281 i2c->DR = (uint8_t)data;
mbed_official 87:085cde657901 282
mbed_official 87:085cde657901 283 // Wait until the byte is transmitted
mbed_official 172:2f4f8c56b261 284 timeout = FLAG_TIMEOUT;
mbed_official 87:085cde657901 285 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
mbed_official 215:83cf97a28428 286 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
mbed_official 87:085cde657901 287 if ((timeout--) == 0) {
mbed_official 87:085cde657901 288 return 0;
mbed_official 87:085cde657901 289 }
mbed_official 87:085cde657901 290 }
mbed_official 172:2f4f8c56b261 291
mbed_official 87:085cde657901 292 return 1;
mbed_official 87:085cde657901 293 }
mbed_official 87:085cde657901 294
mbed_official 87:085cde657901 295 void i2c_reset(i2c_t *obj) {
mbed_official 172:2f4f8c56b261 296 if (obj->i2c == I2C_1) {
mbed_official 87:085cde657901 297 __I2C1_FORCE_RESET();
mbed_official 87:085cde657901 298 __I2C1_RELEASE_RESET();
mbed_official 87:085cde657901 299 }
mbed_official 115:4f0cb9cdc478 300 if (obj->i2c == I2C_2) {
mbed_official 115:4f0cb9cdc478 301 __I2C2_FORCE_RESET();
mbed_official 115:4f0cb9cdc478 302 __I2C2_RELEASE_RESET();
mbed_official 115:4f0cb9cdc478 303 }
mbed_official 115:4f0cb9cdc478 304 if (obj->i2c == I2C_3) {
mbed_official 115:4f0cb9cdc478 305 __I2C3_FORCE_RESET();
mbed_official 115:4f0cb9cdc478 306 __I2C3_RELEASE_RESET();
mbed_official 115:4f0cb9cdc478 307 }
mbed_official 87:085cde657901 308 }
mbed_official 87:085cde657901 309
mbed_official 87:085cde657901 310 #if DEVICE_I2CSLAVE
mbed_official 87:085cde657901 311
mbed_official 87:085cde657901 312 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 87:085cde657901 313 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 314 uint16_t tmpreg = 0;
mbed_official 87:085cde657901 315
mbed_official 87:085cde657901 316 // Get the old register value
mbed_official 87:085cde657901 317 tmpreg = i2c->OAR1;
mbed_official 87:085cde657901 318 // Reset address bits
mbed_official 87:085cde657901 319 tmpreg &= 0xFC00;
mbed_official 87:085cde657901 320 // Set new address
mbed_official 87:085cde657901 321 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 87:085cde657901 322 // Store the new register value
mbed_official 87:085cde657901 323 i2c->OAR1 = tmpreg;
mbed_official 87:085cde657901 324 }
mbed_official 87:085cde657901 325
mbed_official 87:085cde657901 326 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 181:a4cbdfbbd2f4 327 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 215:83cf97a28428 328 if (enable_slave) {
mbed_official 181:a4cbdfbbd2f4 329 obj->slave = 1;
mbed_official 181:a4cbdfbbd2f4 330 /* Enable Address Acknowledge */
mbed_official 181:a4cbdfbbd2f4 331 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 181:a4cbdfbbd2f4 332 }
mbed_official 87:085cde657901 333 }
mbed_official 87:085cde657901 334
mbed_official 87:085cde657901 335 // See I2CSlave.h
mbed_official 87:085cde657901 336 #define NoData 0 // the slave has not been addressed
mbed_official 87:085cde657901 337 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 87:085cde657901 338 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 87:085cde657901 339 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 87:085cde657901 340
mbed_official 87:085cde657901 341 int i2c_slave_receive(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 342 int retValue = NoData;
mbed_official 215:83cf97a28428 343
mbed_official 215:83cf97a28428 344 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 215:83cf97a28428 345 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 215:83cf97a28428 346 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1)
mbed_official 215:83cf97a28428 347 retValue = ReadAddressed;
mbed_official 181:a4cbdfbbd2f4 348 else
mbed_official 215:83cf97a28428 349 retValue = WriteAddressed;
mbed_official 215:83cf97a28428 350
mbed_official 181:a4cbdfbbd2f4 351 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 215:83cf97a28428 352 }
mbed_official 181:a4cbdfbbd2f4 353 }
mbed_official 215:83cf97a28428 354
mbed_official 215:83cf97a28428 355 return (retValue);
mbed_official 87:085cde657901 356 }
mbed_official 87:085cde657901 357
mbed_official 87:085cde657901 358 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 181:a4cbdfbbd2f4 359 uint32_t Timeout;
mbed_official 181:a4cbdfbbd2f4 360 int size = 0;
mbed_official 87:085cde657901 361 if (length == 0) return 0;
mbed_official 172:2f4f8c56b261 362
mbed_official 87:085cde657901 363 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 364
mbed_official 215:83cf97a28428 365 while (length > 0) {
mbed_official 181:a4cbdfbbd2f4 366 /* Wait until RXNE flag is set */
mbed_official 181:a4cbdfbbd2f4 367 // Wait until the byte is received
mbed_official 181:a4cbdfbbd2f4 368 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 369 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 370 Timeout--;
mbed_official 181:a4cbdfbbd2f4 371 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 372 return 0;
mbed_official 181:a4cbdfbbd2f4 373 }
mbed_official 215:83cf97a28428 374 }
mbed_official 181:a4cbdfbbd2f4 375
mbed_official 181:a4cbdfbbd2f4 376 /* Read data from DR */
mbed_official 181:a4cbdfbbd2f4 377 (*data++) = I2cHandle.Instance->DR;
mbed_official 181:a4cbdfbbd2f4 378 length--;
mbed_official 181:a4cbdfbbd2f4 379 size++;
mbed_official 181:a4cbdfbbd2f4 380
mbed_official 215:83cf97a28428 381 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 181:a4cbdfbbd2f4 382 /* Read data from DR */
mbed_official 181:a4cbdfbbd2f4 383 (*data++) = I2cHandle.Instance->DR;
mbed_official 181:a4cbdfbbd2f4 384 length--;
mbed_official 181:a4cbdfbbd2f4 385 size++;
mbed_official 181:a4cbdfbbd2f4 386 }
mbed_official 87:085cde657901 387 }
mbed_official 87:085cde657901 388
mbed_official 181:a4cbdfbbd2f4 389 /* Wait until STOP flag is set */
mbed_official 181:a4cbdfbbd2f4 390 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 391 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 181:a4cbdfbbd2f4 392 Timeout--;
mbed_official 181:a4cbdfbbd2f4 393 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 394 return 0;
mbed_official 181:a4cbdfbbd2f4 395 }
mbed_official 215:83cf97a28428 396 }
mbed_official 215:83cf97a28428 397
mbed_official 181:a4cbdfbbd2f4 398 /* Clear STOP flag */
mbed_official 181:a4cbdfbbd2f4 399 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
mbed_official 181:a4cbdfbbd2f4 400
mbed_official 181:a4cbdfbbd2f4 401 /* Wait until BUSY flag is reset */
mbed_official 181:a4cbdfbbd2f4 402 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 403 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 181:a4cbdfbbd2f4 404 Timeout--;
mbed_official 181:a4cbdfbbd2f4 405 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 406 return 0;
mbed_official 181:a4cbdfbbd2f4 407 }
mbed_official 181:a4cbdfbbd2f4 408 }
mbed_official 181:a4cbdfbbd2f4 409
mbed_official 181:a4cbdfbbd2f4 410 return size;
mbed_official 87:085cde657901 411 }
mbed_official 87:085cde657901 412
mbed_official 87:085cde657901 413 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 181:a4cbdfbbd2f4 414 uint32_t Timeout;
mbed_official 181:a4cbdfbbd2f4 415 int size = 0;
mbed_official 87:085cde657901 416 if (length == 0) return 0;
mbed_official 172:2f4f8c56b261 417
mbed_official 87:085cde657901 418 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 419
mbed_official 215:83cf97a28428 420 while (length > 0) {
mbed_official 181:a4cbdfbbd2f4 421 /* Wait until TXE flag is set */
mbed_official 181:a4cbdfbbd2f4 422 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 423 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 424 Timeout--;
mbed_official 181:a4cbdfbbd2f4 425 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 426 return 0;
mbed_official 181:a4cbdfbbd2f4 427 }
mbed_official 215:83cf97a28428 428 }
mbed_official 181:a4cbdfbbd2f4 429
mbed_official 181:a4cbdfbbd2f4 430
mbed_official 181:a4cbdfbbd2f4 431 /* Write data to DR */
mbed_official 181:a4cbdfbbd2f4 432 I2cHandle.Instance->DR = (*data++);
mbed_official 181:a4cbdfbbd2f4 433 length--;
mbed_official 181:a4cbdfbbd2f4 434 size++;
mbed_official 215:83cf97a28428 435
mbed_official 215:83cf97a28428 436 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 215:83cf97a28428 437 /* Write data to DR */
mbed_official 215:83cf97a28428 438 I2cHandle.Instance->DR = (*data++);
mbed_official 215:83cf97a28428 439 length--;
mbed_official 215:83cf97a28428 440 size++;
mbed_official 215:83cf97a28428 441 }
mbed_official 181:a4cbdfbbd2f4 442 }
mbed_official 215:83cf97a28428 443
mbed_official 181:a4cbdfbbd2f4 444 /* Wait until AF flag is set */
mbed_official 181:a4cbdfbbd2f4 445 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 446 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
mbed_official 181:a4cbdfbbd2f4 447 Timeout--;
mbed_official 181:a4cbdfbbd2f4 448 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 449 return 0;
mbed_official 181:a4cbdfbbd2f4 450 }
mbed_official 215:83cf97a28428 451 }
mbed_official 181:a4cbdfbbd2f4 452
mbed_official 215:83cf97a28428 453
mbed_official 181:a4cbdfbbd2f4 454 /* Clear AF flag */
mbed_official 181:a4cbdfbbd2f4 455 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 181:a4cbdfbbd2f4 456
mbed_official 181:a4cbdfbbd2f4 457
mbed_official 181:a4cbdfbbd2f4 458 /* Wait until BUSY flag is reset */
mbed_official 181:a4cbdfbbd2f4 459 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 460 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 181:a4cbdfbbd2f4 461 Timeout--;
mbed_official 181:a4cbdfbbd2f4 462 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 463 return 0;
mbed_official 181:a4cbdfbbd2f4 464 }
mbed_official 87:085cde657901 465 }
mbed_official 87:085cde657901 466
mbed_official 181:a4cbdfbbd2f4 467 I2cHandle.State = HAL_I2C_STATE_READY;
mbed_official 181:a4cbdfbbd2f4 468
mbed_official 181:a4cbdfbbd2f4 469 /* Process Unlocked */
mbed_official 181:a4cbdfbbd2f4 470 __HAL_UNLOCK(&I2cHandle);
mbed_official 181:a4cbdfbbd2f4 471
mbed_official 181:a4cbdfbbd2f4 472 return size;
mbed_official 87:085cde657901 473 }
mbed_official 87:085cde657901 474
mbed_official 87:085cde657901 475
mbed_official 87:085cde657901 476 #endif // DEVICE_I2CSLAVE
mbed_official 87:085cde657901 477
mbed_official 87:085cde657901 478 #endif // DEVICE_I2C