shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/i2c_api.c@227:7bd0639b8911, 2014-06-11 (annotated)

Committer:
mbed_official
Date:
Wed Jun 11 16:00:09 2014 +0100
Revision:
227:7bd0639b8911
Parent:
215:83cf97a28428
Child:
247:135e3186a638
Synchronized with git revision d58d532ebc0e0a96f4fffb8edefc082b71b964af



Full URL: https://github.com/mbedmicro/mbed/commit/d58d532ebc0e0a96f4fffb8edefc082b71b964af/

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 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 227:7bd0639b8911 69 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 87:085cde657901 70
mbed_official 87:085cde657901 71 // Enable I2C clock
mbed_official 172:2f4f8c56b261 72 if (obj->i2c == I2C_1) {
mbed_official 87:085cde657901 73 __I2C1_CLK_ENABLE();
mbed_official 87:085cde657901 74 }
mbed_official 115:4f0cb9cdc478 75 if (obj->i2c == I2C_2) {
mbed_official 115:4f0cb9cdc478 76 __I2C2_CLK_ENABLE();
mbed_official 115:4f0cb9cdc478 77 }
mbed_official 115:4f0cb9cdc478 78 if (obj->i2c == I2C_3) {
mbed_official 115:4f0cb9cdc478 79 __I2C3_CLK_ENABLE();
mbed_official 115:4f0cb9cdc478 80 }
mbed_official 87:085cde657901 81
mbed_official 87:085cde657901 82 // Configure I2C pins
mbed_official 87:085cde657901 83 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 87:085cde657901 84 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 87:085cde657901 85 pin_mode(sda, OpenDrain);
mbed_official 87:085cde657901 86 pin_mode(scl, OpenDrain);
mbed_official 172:2f4f8c56b261 87
mbed_official 87:085cde657901 88 // Reset to clear pending flags if any
mbed_official 87:085cde657901 89 i2c_reset(obj);
mbed_official 172:2f4f8c56b261 90
mbed_official 87:085cde657901 91 // I2C configuration
mbed_official 172:2f4f8c56b261 92 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 215:83cf97a28428 93
mbed_official 181:a4cbdfbbd2f4 94 // I2C master by default
mbed_official 181:a4cbdfbbd2f4 95 obj->slave = 0;
mbed_official 87:085cde657901 96 }
mbed_official 87:085cde657901 97
mbed_official 87:085cde657901 98 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 227:7bd0639b8911 99 MBED_ASSERT((hz != 0) && (hz <= 400000));
mbed_official 87:085cde657901 100 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 172:2f4f8c56b261 101
mbed_official 227:7bd0639b8911 102 // I2C configuration
mbed_official 227:7bd0639b8911 103 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 227:7bd0639b8911 104 I2cHandle.Init.ClockSpeed = hz;
mbed_official 227:7bd0639b8911 105 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 227:7bd0639b8911 106 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
mbed_official 227:7bd0639b8911 107 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 227:7bd0639b8911 108 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 227:7bd0639b8911 109 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 227:7bd0639b8911 110 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 227:7bd0639b8911 111 HAL_I2C_Init(&I2cHandle);
mbed_official 227:7bd0639b8911 112 if (obj->slave) {
mbed_official 227:7bd0639b8911 113 /* Enable Address Acknowledge */
mbed_official 227:7bd0639b8911 114 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 87:085cde657901 115 }
mbed_official 227:7bd0639b8911 116
mbed_official 87:085cde657901 117 }
mbed_official 87:085cde657901 118
mbed_official 87:085cde657901 119 inline int i2c_start(i2c_t *obj) {
mbed_official 87:085cde657901 120 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 121 int timeout;
mbed_official 172:2f4f8c56b261 122
mbed_official 87:085cde657901 123 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 172:2f4f8c56b261 124
mbed_official 87:085cde657901 125 // Clear Acknowledge failure flag
mbed_official 87:085cde657901 126 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 172:2f4f8c56b261 127
mbed_official 87:085cde657901 128 // Generate the START condition
mbed_official 87:085cde657901 129 i2c->CR1 |= I2C_CR1_START;
mbed_official 172:2f4f8c56b261 130
mbed_official 87:085cde657901 131 // Wait the START condition has been correctly sent
mbed_official 87:085cde657901 132 timeout = FLAG_TIMEOUT;
mbed_official 87:085cde657901 133 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 172:2f4f8c56b261 134 if ((timeout--) == 0) {
mbed_official 172:2f4f8c56b261 135 return 1;
mbed_official 172:2f4f8c56b261 136 }
mbed_official 87:085cde657901 137 }
mbed_official 172:2f4f8c56b261 138
mbed_official 87:085cde657901 139 return 0;
mbed_official 87:085cde657901 140 }
mbed_official 87:085cde657901 141
mbed_official 87:085cde657901 142 inline int i2c_stop(i2c_t *obj) {
mbed_official 87:085cde657901 143 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 172:2f4f8c56b261 144
mbed_official 87:085cde657901 145 // Generate the STOP condition
mbed_official 87:085cde657901 146 i2c->CR1 |= I2C_CR1_STOP;
mbed_official 87:085cde657901 147
mbed_official 87:085cde657901 148 return 0;
mbed_official 87:085cde657901 149 }
mbed_official 87:085cde657901 150
mbed_official 172:2f4f8c56b261 151 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 183:46ae3190e86c 152 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 183:46ae3190e86c 153 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 183:46ae3190e86c 154 int timeout;
mbed_official 183:46ae3190e86c 155 int count;
mbed_official 183:46ae3190e86c 156 int value;
mbed_official 183:46ae3190e86c 157
mbed_official 87:085cde657901 158 if (length == 0) return 0;
mbed_official 172:2f4f8c56b261 159
mbed_official 183:46ae3190e86c 160 i2c_start(obj);
mbed_official 87:085cde657901 161
mbed_official 183:46ae3190e86c 162 // Wait until SB flag is set
mbed_official 183:46ae3190e86c 163 timeout = FLAG_TIMEOUT;
mbed_official 183:46ae3190e86c 164 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 183:46ae3190e86c 165 timeout--;
mbed_official 183:46ae3190e86c 166 if (timeout == 0) {
mbed_official 183:46ae3190e86c 167 return 0;
mbed_official 183:46ae3190e86c 168 }
mbed_official 87:085cde657901 169 }
mbed_official 215:83cf97a28428 170
mbed_official 215:83cf97a28428 171 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
mbed_official 215:83cf97a28428 172
mbed_official 215:83cf97a28428 173
mbed_official 183:46ae3190e86c 174 // Wait address is acknowledged
mbed_official 183:46ae3190e86c 175 timeout = FLAG_TIMEOUT;
mbed_official 183:46ae3190e86c 176 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 183:46ae3190e86c 177 timeout--;
mbed_official 183:46ae3190e86c 178 if (timeout == 0) {
mbed_official 183:46ae3190e86c 179 return 0;
mbed_official 183:46ae3190e86c 180 }
mbed_official 183:46ae3190e86c 181 }
mbed_official 183:46ae3190e86c 182 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 183:46ae3190e86c 183
mbed_official 183:46ae3190e86c 184 // Read all bytes except last one
mbed_official 183:46ae3190e86c 185 for (count = 0; count < (length - 1); count++) {
mbed_official 183:46ae3190e86c 186 value = i2c_byte_read(obj, 0);
mbed_official 183:46ae3190e86c 187 data[count] = (char)value;
mbed_official 183:46ae3190e86c 188 }
mbed_official 183:46ae3190e86c 189
mbed_official 183:46ae3190e86c 190 // If not repeated start, send stop.
mbed_official 183:46ae3190e86c 191 // Warning: must be done BEFORE the data is read.
mbed_official 183:46ae3190e86c 192 if (stop) {
mbed_official 183:46ae3190e86c 193 i2c_stop(obj);
mbed_official 183:46ae3190e86c 194 }
mbed_official 183:46ae3190e86c 195
mbed_official 183:46ae3190e86c 196 // Read the last byte
mbed_official 183:46ae3190e86c 197 value = i2c_byte_read(obj, 1);
mbed_official 183:46ae3190e86c 198 data[count] = (char)value;
mbed_official 87:085cde657901 199
mbed_official 87:085cde657901 200 return length;
mbed_official 87:085cde657901 201 }
mbed_official 87:085cde657901 202
mbed_official 87:085cde657901 203 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 183:46ae3190e86c 204 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 183:46ae3190e86c 205 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 183:46ae3190e86c 206 int timeout;
mbed_official 183:46ae3190e86c 207 int count;
mbed_official 172:2f4f8c56b261 208
mbed_official 183:46ae3190e86c 209 if (length == 0) return 0;
mbed_official 183:46ae3190e86c 210 i2c_start(obj);
mbed_official 87:085cde657901 211
mbed_official 183:46ae3190e86c 212 // Wait until SB flag is set
mbed_official 183:46ae3190e86c 213 timeout = FLAG_TIMEOUT;
mbed_official 183:46ae3190e86c 214 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 183:46ae3190e86c 215 timeout--;
mbed_official 183:46ae3190e86c 216 if (timeout == 0) {
mbed_official 183:46ae3190e86c 217 return 0;
mbed_official 183:46ae3190e86c 218 }
mbed_official 183:46ae3190e86c 219 }
mbed_official 215:83cf97a28428 220
mbed_official 183:46ae3190e86c 221 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
mbed_official 215:83cf97a28428 222
mbed_official 183:46ae3190e86c 223
mbed_official 183:46ae3190e86c 224 // Wait address is acknowledged
mbed_official 183:46ae3190e86c 225 timeout = FLAG_TIMEOUT;
mbed_official 183:46ae3190e86c 226 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 183:46ae3190e86c 227 timeout--;
mbed_official 183:46ae3190e86c 228 if (timeout == 0) {
mbed_official 183:46ae3190e86c 229 return 0;
mbed_official 183:46ae3190e86c 230 }
mbed_official 183:46ae3190e86c 231 }
mbed_official 183:46ae3190e86c 232 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 215:83cf97a28428 233
mbed_official 183:46ae3190e86c 234 for (count = 0; count < length; count++) {
mbed_official 183:46ae3190e86c 235 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 183:46ae3190e86c 236 i2c_stop(obj);
mbed_official 183:46ae3190e86c 237 return 0;
mbed_official 183:46ae3190e86c 238 }
mbed_official 87:085cde657901 239 }
mbed_official 172:2f4f8c56b261 240
mbed_official 183:46ae3190e86c 241 // If not repeated start, send stop.
mbed_official 183:46ae3190e86c 242 if (stop) {
mbed_official 183:46ae3190e86c 243 i2c_stop(obj);
mbed_official 183:46ae3190e86c 244 }
mbed_official 183:46ae3190e86c 245
mbed_official 183:46ae3190e86c 246 return count;
mbed_official 87:085cde657901 247 }
mbed_official 87:085cde657901 248
mbed_official 87:085cde657901 249 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 87:085cde657901 250 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 251 int timeout;
mbed_official 172:2f4f8c56b261 252
mbed_official 87:085cde657901 253 if (last) {
mbed_official 87:085cde657901 254 // Don't acknowledge the last byte
mbed_official 87:085cde657901 255 i2c->CR1 &= ~I2C_CR1_ACK;
mbed_official 87:085cde657901 256 } else {
mbed_official 87:085cde657901 257 // Acknowledge the byte
mbed_official 87:085cde657901 258 i2c->CR1 |= I2C_CR1_ACK;
mbed_official 87:085cde657901 259 }
mbed_official 87:085cde657901 260
mbed_official 87:085cde657901 261 // Wait until the byte is received
mbed_official 87:085cde657901 262 timeout = FLAG_TIMEOUT;
mbed_official 87:085cde657901 263 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 172:2f4f8c56b261 264 if ((timeout--) == 0) {
mbed_official 172:2f4f8c56b261 265 return 0;
mbed_official 172:2f4f8c56b261 266 }
mbed_official 87:085cde657901 267 }
mbed_official 172:2f4f8c56b261 268
mbed_official 87:085cde657901 269 return (int)i2c->DR;
mbed_official 87:085cde657901 270 }
mbed_official 87:085cde657901 271
mbed_official 87:085cde657901 272 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 87:085cde657901 273 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 274 int timeout;
mbed_official 87:085cde657901 275
mbed_official 87:085cde657901 276 i2c->DR = (uint8_t)data;
mbed_official 87:085cde657901 277
mbed_official 87:085cde657901 278 // Wait until the byte is transmitted
mbed_official 172:2f4f8c56b261 279 timeout = FLAG_TIMEOUT;
mbed_official 87:085cde657901 280 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
mbed_official 215:83cf97a28428 281 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
mbed_official 87:085cde657901 282 if ((timeout--) == 0) {
mbed_official 87:085cde657901 283 return 0;
mbed_official 87:085cde657901 284 }
mbed_official 87:085cde657901 285 }
mbed_official 172:2f4f8c56b261 286
mbed_official 87:085cde657901 287 return 1;
mbed_official 87:085cde657901 288 }
mbed_official 87:085cde657901 289
mbed_official 87:085cde657901 290 void i2c_reset(i2c_t *obj) {
mbed_official 172:2f4f8c56b261 291 if (obj->i2c == I2C_1) {
mbed_official 87:085cde657901 292 __I2C1_FORCE_RESET();
mbed_official 87:085cde657901 293 __I2C1_RELEASE_RESET();
mbed_official 87:085cde657901 294 }
mbed_official 115:4f0cb9cdc478 295 if (obj->i2c == I2C_2) {
mbed_official 115:4f0cb9cdc478 296 __I2C2_FORCE_RESET();
mbed_official 115:4f0cb9cdc478 297 __I2C2_RELEASE_RESET();
mbed_official 115:4f0cb9cdc478 298 }
mbed_official 115:4f0cb9cdc478 299 if (obj->i2c == I2C_3) {
mbed_official 115:4f0cb9cdc478 300 __I2C3_FORCE_RESET();
mbed_official 115:4f0cb9cdc478 301 __I2C3_RELEASE_RESET();
mbed_official 115:4f0cb9cdc478 302 }
mbed_official 87:085cde657901 303 }
mbed_official 87:085cde657901 304
mbed_official 87:085cde657901 305 #if DEVICE_I2CSLAVE
mbed_official 87:085cde657901 306
mbed_official 87:085cde657901 307 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 87:085cde657901 308 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 309 uint16_t tmpreg = 0;
mbed_official 87:085cde657901 310
mbed_official 87:085cde657901 311 // Get the old register value
mbed_official 87:085cde657901 312 tmpreg = i2c->OAR1;
mbed_official 87:085cde657901 313 // Reset address bits
mbed_official 87:085cde657901 314 tmpreg &= 0xFC00;
mbed_official 87:085cde657901 315 // Set new address
mbed_official 87:085cde657901 316 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 87:085cde657901 317 // Store the new register value
mbed_official 87:085cde657901 318 i2c->OAR1 = tmpreg;
mbed_official 87:085cde657901 319 }
mbed_official 87:085cde657901 320
mbed_official 87:085cde657901 321 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 181:a4cbdfbbd2f4 322 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 215:83cf97a28428 323 if (enable_slave) {
mbed_official 181:a4cbdfbbd2f4 324 obj->slave = 1;
mbed_official 181:a4cbdfbbd2f4 325 /* Enable Address Acknowledge */
mbed_official 181:a4cbdfbbd2f4 326 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 181:a4cbdfbbd2f4 327 }
mbed_official 87:085cde657901 328 }
mbed_official 87:085cde657901 329
mbed_official 87:085cde657901 330 // See I2CSlave.h
mbed_official 87:085cde657901 331 #define NoData 0 // the slave has not been addressed
mbed_official 87:085cde657901 332 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 87:085cde657901 333 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 87:085cde657901 334 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 87:085cde657901 335
mbed_official 87:085cde657901 336 int i2c_slave_receive(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 337 int retValue = NoData;
mbed_official 215:83cf97a28428 338
mbed_official 215:83cf97a28428 339 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 215:83cf97a28428 340 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 215:83cf97a28428 341 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1)
mbed_official 215:83cf97a28428 342 retValue = ReadAddressed;
mbed_official 181:a4cbdfbbd2f4 343 else
mbed_official 215:83cf97a28428 344 retValue = WriteAddressed;
mbed_official 215:83cf97a28428 345
mbed_official 181:a4cbdfbbd2f4 346 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 215:83cf97a28428 347 }
mbed_official 181:a4cbdfbbd2f4 348 }
mbed_official 215:83cf97a28428 349
mbed_official 215:83cf97a28428 350 return (retValue);
mbed_official 87:085cde657901 351 }
mbed_official 87:085cde657901 352
mbed_official 87:085cde657901 353 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 181:a4cbdfbbd2f4 354 uint32_t Timeout;
mbed_official 181:a4cbdfbbd2f4 355 int size = 0;
mbed_official 87:085cde657901 356 if (length == 0) return 0;
mbed_official 172:2f4f8c56b261 357
mbed_official 87:085cde657901 358 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 359
mbed_official 215:83cf97a28428 360 while (length > 0) {
mbed_official 181:a4cbdfbbd2f4 361 /* Wait until RXNE flag is set */
mbed_official 181:a4cbdfbbd2f4 362 // Wait until the byte is received
mbed_official 181:a4cbdfbbd2f4 363 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 364 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 365 Timeout--;
mbed_official 181:a4cbdfbbd2f4 366 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 367 return 0;
mbed_official 181:a4cbdfbbd2f4 368 }
mbed_official 215:83cf97a28428 369 }
mbed_official 181:a4cbdfbbd2f4 370
mbed_official 181:a4cbdfbbd2f4 371 /* Read data from DR */
mbed_official 181:a4cbdfbbd2f4 372 (*data++) = I2cHandle.Instance->DR;
mbed_official 181:a4cbdfbbd2f4 373 length--;
mbed_official 181:a4cbdfbbd2f4 374 size++;
mbed_official 181:a4cbdfbbd2f4 375
mbed_official 215:83cf97a28428 376 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 181:a4cbdfbbd2f4 377 /* Read data from DR */
mbed_official 181:a4cbdfbbd2f4 378 (*data++) = I2cHandle.Instance->DR;
mbed_official 181:a4cbdfbbd2f4 379 length--;
mbed_official 181:a4cbdfbbd2f4 380 size++;
mbed_official 181:a4cbdfbbd2f4 381 }
mbed_official 87:085cde657901 382 }
mbed_official 87:085cde657901 383
mbed_official 181:a4cbdfbbd2f4 384 /* Wait until STOP flag is set */
mbed_official 181:a4cbdfbbd2f4 385 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 386 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 181:a4cbdfbbd2f4 387 Timeout--;
mbed_official 181:a4cbdfbbd2f4 388 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 389 return 0;
mbed_official 181:a4cbdfbbd2f4 390 }
mbed_official 215:83cf97a28428 391 }
mbed_official 215:83cf97a28428 392
mbed_official 181:a4cbdfbbd2f4 393 /* Clear STOP flag */
mbed_official 181:a4cbdfbbd2f4 394 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
mbed_official 181:a4cbdfbbd2f4 395
mbed_official 181:a4cbdfbbd2f4 396 /* Wait until BUSY flag is reset */
mbed_official 181:a4cbdfbbd2f4 397 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 398 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 181:a4cbdfbbd2f4 399 Timeout--;
mbed_official 181:a4cbdfbbd2f4 400 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 401 return 0;
mbed_official 181:a4cbdfbbd2f4 402 }
mbed_official 181:a4cbdfbbd2f4 403 }
mbed_official 181:a4cbdfbbd2f4 404
mbed_official 181:a4cbdfbbd2f4 405 return size;
mbed_official 87:085cde657901 406 }
mbed_official 87:085cde657901 407
mbed_official 87:085cde657901 408 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 181:a4cbdfbbd2f4 409 uint32_t Timeout;
mbed_official 181:a4cbdfbbd2f4 410 int size = 0;
mbed_official 87:085cde657901 411 if (length == 0) return 0;
mbed_official 172:2f4f8c56b261 412
mbed_official 87:085cde657901 413 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 414
mbed_official 215:83cf97a28428 415 while (length > 0) {
mbed_official 181:a4cbdfbbd2f4 416 /* Wait until TXE flag is set */
mbed_official 181:a4cbdfbbd2f4 417 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 418 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 419 Timeout--;
mbed_official 181:a4cbdfbbd2f4 420 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 421 return 0;
mbed_official 181:a4cbdfbbd2f4 422 }
mbed_official 215:83cf97a28428 423 }
mbed_official 181:a4cbdfbbd2f4 424
mbed_official 181:a4cbdfbbd2f4 425
mbed_official 181:a4cbdfbbd2f4 426 /* Write data to DR */
mbed_official 181:a4cbdfbbd2f4 427 I2cHandle.Instance->DR = (*data++);
mbed_official 181:a4cbdfbbd2f4 428 length--;
mbed_official 181:a4cbdfbbd2f4 429 size++;
mbed_official 215:83cf97a28428 430
mbed_official 215:83cf97a28428 431 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 215:83cf97a28428 432 /* Write data to DR */
mbed_official 215:83cf97a28428 433 I2cHandle.Instance->DR = (*data++);
mbed_official 215:83cf97a28428 434 length--;
mbed_official 215:83cf97a28428 435 size++;
mbed_official 215:83cf97a28428 436 }
mbed_official 181:a4cbdfbbd2f4 437 }
mbed_official 215:83cf97a28428 438
mbed_official 181:a4cbdfbbd2f4 439 /* Wait until AF flag is set */
mbed_official 181:a4cbdfbbd2f4 440 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 441 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
mbed_official 181:a4cbdfbbd2f4 442 Timeout--;
mbed_official 181:a4cbdfbbd2f4 443 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 444 return 0;
mbed_official 181:a4cbdfbbd2f4 445 }
mbed_official 215:83cf97a28428 446 }
mbed_official 181:a4cbdfbbd2f4 447
mbed_official 215:83cf97a28428 448
mbed_official 181:a4cbdfbbd2f4 449 /* Clear AF flag */
mbed_official 181:a4cbdfbbd2f4 450 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 181:a4cbdfbbd2f4 451
mbed_official 181:a4cbdfbbd2f4 452
mbed_official 181:a4cbdfbbd2f4 453 /* Wait until BUSY flag is reset */
mbed_official 181:a4cbdfbbd2f4 454 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 455 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 181:a4cbdfbbd2f4 456 Timeout--;
mbed_official 181:a4cbdfbbd2f4 457 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 458 return 0;
mbed_official 181:a4cbdfbbd2f4 459 }
mbed_official 87:085cde657901 460 }
mbed_official 87:085cde657901 461
mbed_official 181:a4cbdfbbd2f4 462 I2cHandle.State = HAL_I2C_STATE_READY;
mbed_official 181:a4cbdfbbd2f4 463
mbed_official 181:a4cbdfbbd2f4 464 /* Process Unlocked */
mbed_official 181:a4cbdfbbd2f4 465 __HAL_UNLOCK(&I2cHandle);
mbed_official 181:a4cbdfbbd2f4 466
mbed_official 181:a4cbdfbbd2f4 467 return size;
mbed_official 87:085cde657901 468 }
mbed_official 87:085cde657901 469
mbed_official 87:085cde657901 470
mbed_official 87:085cde657901 471 #endif // DEVICE_I2CSLAVE
mbed_official 87:085cde657901 472
mbed_official 87:085cde657901 473 #endif // DEVICE_I2C