Janek Mann / mbed-src-openwear

mbed library sources modified for open wear

Dependents:   openwear-lifelogger-example

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/i2c_api.c@306:1f0269907d8b, 2014-08-29 (annotated)

Committer:
mbed_official
Date:
Fri Aug 29 20:45:07 2014 +0100
Revision:
306:1f0269907d8b
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 56:99eb381a3269 1 /* mbed Microcontroller Library
mbed_official 70:c1fbde68b492 2 *******************************************************************************
mbed_official 70:c1fbde68b492 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 70:c1fbde68b492 4 * All rights reserved.
mbed_official 56:99eb381a3269 5 *
mbed_official 70:c1fbde68b492 6 * Redistribution and use in source and binary forms, with or without
mbed_official 70:c1fbde68b492 7 * modification, are permitted provided that the following conditions are met:
mbed_official 56:99eb381a3269 8 *
mbed_official 70:c1fbde68b492 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 70:c1fbde68b492 10 * this list of conditions and the following disclaimer.
mbed_official 70:c1fbde68b492 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 70:c1fbde68b492 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 70:c1fbde68b492 13 * and/or other materials provided with the distribution.
mbed_official 70:c1fbde68b492 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 70:c1fbde68b492 15 * may be used to endorse or promote products derived from this software
mbed_official 70:c1fbde68b492 16 * without specific prior written permission.
mbed_official 56:99eb381a3269 17 *
mbed_official 70:c1fbde68b492 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 70:c1fbde68b492 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 70:c1fbde68b492 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 70:c1fbde68b492 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 70:c1fbde68b492 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 70:c1fbde68b492 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 70:c1fbde68b492 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 70:c1fbde68b492 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 70:c1fbde68b492 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 70:c1fbde68b492 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 70:c1fbde68b492 28 *******************************************************************************
mbed_official 56:99eb381a3269 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 56:99eb381a3269 31 #include "i2c_api.h"
mbed_official 56:99eb381a3269 32
mbed_official 56:99eb381a3269 33 #if DEVICE_I2C
mbed_official 56:99eb381a3269 34
mbed_official 56:99eb381a3269 35 #include "cmsis.h"
mbed_official 56:99eb381a3269 36 #include "pinmap.h"
mbed_official 56:99eb381a3269 37
mbed_official 56:99eb381a3269 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 174:8bb9f3a33240 39 not based on accurate values, they just guarantee that the application will
mbed_official 174:8bb9f3a33240 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 56:99eb381a3269 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 56:99eb381a3269 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 56:99eb381a3269 43
mbed_official 56:99eb381a3269 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 167:d5744491c362 45 {PB_7, I2C_1, STM_PIN_DATA(GPIO_Mode_AF_OD, 0)},
mbed_official 167:d5744491c362 46 {PB_9, I2C_1, STM_PIN_DATA(GPIO_Mode_AF_OD, 2)}, // GPIO_Remap_I2C1
mbed_official 167:d5744491c362 47 {PB_11, I2C_2, STM_PIN_DATA(GPIO_Mode_AF_OD, 0)},
mbed_official 56:99eb381a3269 48 {NC, NC, 0}
mbed_official 56:99eb381a3269 49 };
mbed_official 56:99eb381a3269 50
mbed_official 56:99eb381a3269 51 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 167:d5744491c362 52 {PB_6, I2C_1, STM_PIN_DATA(GPIO_Mode_AF_OD, 0)},
mbed_official 167:d5744491c362 53 {PB_8, I2C_1, STM_PIN_DATA(GPIO_Mode_AF_OD, 2)}, // GPIO_Remap_I2C1
mbed_official 167:d5744491c362 54 {PB_10, I2C_2, STM_PIN_DATA(GPIO_Mode_AF_OD, 0)},
mbed_official 56:99eb381a3269 55 {NC, NC, 0}
mbed_official 56:99eb381a3269 56 };
mbed_official 56:99eb381a3269 57
mbed_official 306:1f0269907d8b 58 int i2c1_inited = 0;
mbed_official 306:1f0269907d8b 59 int i2c2_inited = 0;
mbed_official 306:1f0269907d8b 60
mbed_official 174:8bb9f3a33240 61 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 306:1f0269907d8b 62 int timeout;
mbed_official 306:1f0269907d8b 63 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 306:1f0269907d8b 64
mbed_official 56:99eb381a3269 65 // Determine the I2C to use
mbed_official 56:99eb381a3269 66 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 56:99eb381a3269 67 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 56:99eb381a3269 68
mbed_official 56:99eb381a3269 69 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 70 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 56:99eb381a3269 71
mbed_official 306:1f0269907d8b 72 // Enable I2C clock and configure I2C pins if not done before
mbed_official 306:1f0269907d8b 73 if ((obj->i2c == I2C_1)&& !i2c1_inited) {
mbed_official 306:1f0269907d8b 74 i2c1_inited = 1;
mbed_official 56:99eb381a3269 75 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 306:1f0269907d8b 76 // Configure I2C pins
mbed_official 306:1f0269907d8b 77 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 306:1f0269907d8b 78 pin_mode(scl, OpenDrain);
mbed_official 306:1f0269907d8b 79 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 306:1f0269907d8b 80 pin_mode(sda, OpenDrain);
mbed_official 56:99eb381a3269 81 }
mbed_official 306:1f0269907d8b 82 if ((obj->i2c == I2C_2)&& !i2c2_inited) {
mbed_official 306:1f0269907d8b 83 i2c2_inited = 1;
mbed_official 56:99eb381a3269 84 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 56:99eb381a3269 85 // Configure I2C pins
mbed_official 80:66393a7b209d 86 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 80:66393a7b209d 87 pin_mode(scl, OpenDrain);
mbed_official 56:99eb381a3269 88 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 56:99eb381a3269 89 pin_mode(sda, OpenDrain);
mbed_official 306:1f0269907d8b 90 }
mbed_official 174:8bb9f3a33240 91
mbed_official 56:99eb381a3269 92 // Reset to clear pending flags if any
mbed_official 56:99eb381a3269 93 i2c_reset(obj);
mbed_official 174:8bb9f3a33240 94
mbed_official 56:99eb381a3269 95 // I2C configuration
mbed_official 174:8bb9f3a33240 96 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 56:99eb381a3269 97 }
mbed_official 56:99eb381a3269 98
mbed_official 56:99eb381a3269 99 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 306:1f0269907d8b 100 int timeout;
mbed_official 306:1f0269907d8b 101
mbed_official 56:99eb381a3269 102 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 103 I2C_InitTypeDef I2C_InitStructure;
mbed_official 174:8bb9f3a33240 104
mbed_official 56:99eb381a3269 105 if ((hz != 0) && (hz <= 400000)) {
mbed_official 306:1f0269907d8b 106
mbed_official 306:1f0269907d8b 107 // wait before init
mbed_official 306:1f0269907d8b 108 timeout = LONG_TIMEOUT;
mbed_official 306:1f0269907d8b 109 while((I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 306:1f0269907d8b 110
mbed_official 80:66393a7b209d 111 I2C_DeInit(i2c);
mbed_official 174:8bb9f3a33240 112
mbed_official 56:99eb381a3269 113 // I2C configuration
mbed_official 167:d5744491c362 114 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 167:d5744491c362 115 I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
mbed_official 167:d5744491c362 116 I2C_InitStructure.I2C_OwnAddress1 = 0;
mbed_official 167:d5744491c362 117 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 56:99eb381a3269 118 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 167:d5744491c362 119 I2C_InitStructure.I2C_ClockSpeed = hz;
mbed_official 80:66393a7b209d 120 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 174:8bb9f3a33240 121
mbed_official 56:99eb381a3269 122 I2C_Cmd(i2c, ENABLE);
mbed_official 56:99eb381a3269 123 }
mbed_official 56:99eb381a3269 124 }
mbed_official 56:99eb381a3269 125
mbed_official 56:99eb381a3269 126 inline int i2c_start(i2c_t *obj) {
mbed_official 56:99eb381a3269 127 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 128 int timeout;
mbed_official 174:8bb9f3a33240 129
mbed_official 56:99eb381a3269 130 I2C_ClearFlag(i2c, I2C_FLAG_AF); // Clear Acknowledge failure flag
mbed_official 174:8bb9f3a33240 131
mbed_official 56:99eb381a3269 132 // Generate the START condition
mbed_official 174:8bb9f3a33240 133 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 174:8bb9f3a33240 134
mbed_official 56:99eb381a3269 135 // Wait the START condition has been correctly sent
mbed_official 56:99eb381a3269 136 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 137 while (I2C_GetFlagStatus(i2c, I2C_FLAG_SB) == RESET) {
mbed_official 80:66393a7b209d 138 timeout--;
mbed_official 80:66393a7b209d 139 if (timeout == 0) {
mbed_official 80:66393a7b209d 140 return 1;
mbed_official 80:66393a7b209d 141 }
mbed_official 56:99eb381a3269 142 }
mbed_official 174:8bb9f3a33240 143
mbed_official 58:3b55b7a41411 144 return 0;
mbed_official 56:99eb381a3269 145 }
mbed_official 56:99eb381a3269 146
mbed_official 56:99eb381a3269 147 inline int i2c_stop(i2c_t *obj) {
mbed_official 56:99eb381a3269 148 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 174:8bb9f3a33240 149
mbed_official 56:99eb381a3269 150 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 174:8bb9f3a33240 151
mbed_official 58:3b55b7a41411 152 return 0;
mbed_official 56:99eb381a3269 153 }
mbed_official 56:99eb381a3269 154
mbed_official 56:99eb381a3269 155 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 56:99eb381a3269 156 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 157 int timeout;
mbed_official 56:99eb381a3269 158 int count;
mbed_official 56:99eb381a3269 159 int value;
mbed_official 174:8bb9f3a33240 160
mbed_official 56:99eb381a3269 161 i2c_start(obj);
mbed_official 56:99eb381a3269 162
mbed_official 56:99eb381a3269 163 // Send slave address for read
mbed_official 174:8bb9f3a33240 164 I2C_Send7bitAddress(i2c, address, I2C_Direction_Receiver);
mbed_official 56:99eb381a3269 165
mbed_official 56:99eb381a3269 166 // Wait address is acknowledged
mbed_official 56:99eb381a3269 167 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 168 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) == ERROR) {
mbed_official 80:66393a7b209d 169 timeout--;
mbed_official 80:66393a7b209d 170 if (timeout == 0) {
mbed_official 247:135e3186a638 171 return -1;
mbed_official 80:66393a7b209d 172 }
mbed_official 56:99eb381a3269 173 }
mbed_official 174:8bb9f3a33240 174
mbed_official 56:99eb381a3269 175 // Read all bytes except last one
mbed_official 56:99eb381a3269 176 for (count = 0; count < (length - 1); count++) {
mbed_official 56:99eb381a3269 177 value = i2c_byte_read(obj, 0);
mbed_official 56:99eb381a3269 178 data[count] = (char)value;
mbed_official 56:99eb381a3269 179 }
mbed_official 174:8bb9f3a33240 180
mbed_official 56:99eb381a3269 181 // If not repeated start, send stop.
mbed_official 56:99eb381a3269 182 // Warning: must be done BEFORE the data is read.
mbed_official 56:99eb381a3269 183 if (stop) {
mbed_official 56:99eb381a3269 184 i2c_stop(obj);
mbed_official 56:99eb381a3269 185 }
mbed_official 56:99eb381a3269 186
mbed_official 56:99eb381a3269 187 // Read the last byte
mbed_official 56:99eb381a3269 188 value = i2c_byte_read(obj, 1);
mbed_official 56:99eb381a3269 189 data[count] = (char)value;
mbed_official 174:8bb9f3a33240 190
mbed_official 56:99eb381a3269 191 return length;
mbed_official 56:99eb381a3269 192 }
mbed_official 56:99eb381a3269 193
mbed_official 56:99eb381a3269 194 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 56:99eb381a3269 195 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 196 int timeout;
mbed_official 56:99eb381a3269 197 int count;
mbed_official 208:4557f4bb2dd5 198
mbed_official 56:99eb381a3269 199 i2c_start(obj);
mbed_official 56:99eb381a3269 200
mbed_official 56:99eb381a3269 201 // Send slave address for write
mbed_official 56:99eb381a3269 202 I2C_Send7bitAddress(i2c, address, I2C_Direction_Transmitter);
mbed_official 174:8bb9f3a33240 203
mbed_official 56:99eb381a3269 204 // Wait address is acknowledged
mbed_official 56:99eb381a3269 205 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 206 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) == ERROR) {
mbed_official 80:66393a7b209d 207 timeout--;
mbed_official 80:66393a7b209d 208 if (timeout == 0) {
mbed_official 247:135e3186a638 209 return -1;
mbed_official 80:66393a7b209d 210 }
mbed_official 56:99eb381a3269 211 }
mbed_official 56:99eb381a3269 212
mbed_official 56:99eb381a3269 213 for (count = 0; count < length; count++) {
mbed_official 58:3b55b7a41411 214 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 58:3b55b7a41411 215 i2c_stop(obj);
mbed_official 58:3b55b7a41411 216 return 0;
mbed_official 56:99eb381a3269 217 }
mbed_official 56:99eb381a3269 218 }
mbed_official 56:99eb381a3269 219
mbed_official 56:99eb381a3269 220 // If not repeated start, send stop.
mbed_official 56:99eb381a3269 221 if (stop) {
mbed_official 56:99eb381a3269 222 i2c_stop(obj);
mbed_official 56:99eb381a3269 223 }
mbed_official 56:99eb381a3269 224
mbed_official 56:99eb381a3269 225 return count;
mbed_official 56:99eb381a3269 226 }
mbed_official 56:99eb381a3269 227
mbed_official 56:99eb381a3269 228 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 56:99eb381a3269 229 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 230 uint8_t data;
mbed_official 56:99eb381a3269 231 int timeout;
mbed_official 174:8bb9f3a33240 232
mbed_official 56:99eb381a3269 233 if (last) {
mbed_official 56:99eb381a3269 234 // Don't acknowledge the last byte
mbed_official 56:99eb381a3269 235 I2C_AcknowledgeConfig(i2c, DISABLE);
mbed_official 56:99eb381a3269 236 } else {
mbed_official 56:99eb381a3269 237 // Acknowledge the byte
mbed_official 56:99eb381a3269 238 I2C_AcknowledgeConfig(i2c, ENABLE);
mbed_official 56:99eb381a3269 239 }
mbed_official 56:99eb381a3269 240
mbed_official 56:99eb381a3269 241 // Wait until the byte is received
mbed_official 56:99eb381a3269 242 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 243 while (I2C_GetFlagStatus(i2c, I2C_FLAG_RXNE) == RESET) {
mbed_official 80:66393a7b209d 244 timeout--;
mbed_official 80:66393a7b209d 245 if (timeout == 0) {
mbed_official 247:135e3186a638 246 return -1;
mbed_official 80:66393a7b209d 247 }
mbed_official 56:99eb381a3269 248 }
mbed_official 56:99eb381a3269 249
mbed_official 56:99eb381a3269 250 data = I2C_ReceiveData(i2c);
mbed_official 174:8bb9f3a33240 251
mbed_official 56:99eb381a3269 252 return (int)data;
mbed_official 56:99eb381a3269 253 }
mbed_official 56:99eb381a3269 254
mbed_official 56:99eb381a3269 255 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 56:99eb381a3269 256 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 257 int timeout;
mbed_official 56:99eb381a3269 258
mbed_official 56:99eb381a3269 259 I2C_SendData(i2c, (uint8_t)data);
mbed_official 56:99eb381a3269 260
mbed_official 56:99eb381a3269 261 // Wait until the byte is transmitted
mbed_official 208:4557f4bb2dd5 262 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 263 while ((I2C_GetFlagStatus(i2c, I2C_FLAG_TXE) == RESET) &&
mbed_official 174:8bb9f3a33240 264 (I2C_GetFlagStatus(i2c, I2C_FLAG_BTF) == RESET)) {
mbed_official 80:66393a7b209d 265 timeout--;
mbed_official 80:66393a7b209d 266 if (timeout == 0) {
mbed_official 58:3b55b7a41411 267 return 0;
mbed_official 56:99eb381a3269 268 }
mbed_official 56:99eb381a3269 269 }
mbed_official 174:8bb9f3a33240 270
mbed_official 58:3b55b7a41411 271 return 1;
mbed_official 56:99eb381a3269 272 }
mbed_official 56:99eb381a3269 273
mbed_official 56:99eb381a3269 274 void i2c_reset(i2c_t *obj) {
mbed_official 306:1f0269907d8b 275 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 306:1f0269907d8b 276 int timeout;
mbed_official 306:1f0269907d8b 277
mbed_official 306:1f0269907d8b 278 // wait before reset
mbed_official 306:1f0269907d8b 279 timeout = LONG_TIMEOUT;
mbed_official 306:1f0269907d8b 280 while((I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 306:1f0269907d8b 281
mbed_official 174:8bb9f3a33240 282 if (obj->i2c == I2C_1) {
mbed_official 56:99eb381a3269 283 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 56:99eb381a3269 284 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 56:99eb381a3269 285 }
mbed_official 56:99eb381a3269 286 if (obj->i2c == I2C_2) {
mbed_official 56:99eb381a3269 287 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 174:8bb9f3a33240 288 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 56:99eb381a3269 289 }
mbed_official 56:99eb381a3269 290 }
mbed_official 56:99eb381a3269 291
mbed_official 56:99eb381a3269 292 #if DEVICE_I2CSLAVE
mbed_official 56:99eb381a3269 293
mbed_official 56:99eb381a3269 294 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 56:99eb381a3269 295 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 296 uint16_t tmpreg;
mbed_official 174:8bb9f3a33240 297
mbed_official 56:99eb381a3269 298 // Get the old register value
mbed_official 56:99eb381a3269 299 tmpreg = i2c->OAR1;
mbed_official 56:99eb381a3269 300 // Reset address bits
mbed_official 56:99eb381a3269 301 tmpreg &= 0xFC00;
mbed_official 56:99eb381a3269 302 // Set new address
mbed_official 56:99eb381a3269 303 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 56:99eb381a3269 304 // Store the new register value
mbed_official 56:99eb381a3269 305 i2c->OAR1 = tmpreg;
mbed_official 56:99eb381a3269 306 }
mbed_official 56:99eb381a3269 307
mbed_official 56:99eb381a3269 308 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 56:99eb381a3269 309 // Nothing to do
mbed_official 56:99eb381a3269 310 }
mbed_official 56:99eb381a3269 311
mbed_official 58:3b55b7a41411 312 // See I2CSlave.h
mbed_official 58:3b55b7a41411 313 #define NoData 0 // the slave has not been addressed
mbed_official 58:3b55b7a41411 314 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 58:3b55b7a41411 315 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 58:3b55b7a41411 316 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 56:99eb381a3269 317
mbed_official 56:99eb381a3269 318 int i2c_slave_receive(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 319 int retValue = NoData;
mbed_official 181:a4cbdfbbd2f4 320 uint32_t event;
mbed_official 181:a4cbdfbbd2f4 321 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 322
mbed_official 208:4557f4bb2dd5 323 event = I2C_GetLastEvent(i2c);
mbed_official 208:4557f4bb2dd5 324 if (event != 0) {
mbed_official 208:4557f4bb2dd5 325 switch (event) {
mbed_official 181:a4cbdfbbd2f4 326 case I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED:
mbed_official 181:a4cbdfbbd2f4 327 retValue = WriteAddressed;
mbed_official 181:a4cbdfbbd2f4 328 break;
mbed_official 181:a4cbdfbbd2f4 329 case I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED:
mbed_official 181:a4cbdfbbd2f4 330 retValue = ReadAddressed;
mbed_official 181:a4cbdfbbd2f4 331 break;
mbed_official 181:a4cbdfbbd2f4 332 case I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED:
mbed_official 181:a4cbdfbbd2f4 333 retValue = WriteGeneral;
mbed_official 181:a4cbdfbbd2f4 334 break;
mbed_official 181:a4cbdfbbd2f4 335 default:
mbed_official 181:a4cbdfbbd2f4 336 retValue = NoData;
mbed_official 181:a4cbdfbbd2f4 337 break;
mbed_official 181:a4cbdfbbd2f4 338 }
mbed_official 181:a4cbdfbbd2f4 339
mbed_official 208:4557f4bb2dd5 340 // clear ADDR
mbed_official 208:4557f4bb2dd5 341 if ((retValue == WriteAddressed) || (retValue == ReadAddressed)) {
mbed_official 181:a4cbdfbbd2f4 342 // read SR to clear ADDR flag
mbed_official 181:a4cbdfbbd2f4 343 i2c->SR1;
mbed_official 181:a4cbdfbbd2f4 344 i2c->SR2;
mbed_official 181:a4cbdfbbd2f4 345 }
mbed_official 181:a4cbdfbbd2f4 346 // clear stopf
mbed_official 208:4557f4bb2dd5 347 if (I2C_GetFlagStatus(i2c, I2C_FLAG_STOPF) == SET) {
mbed_official 181:a4cbdfbbd2f4 348 // read SR1 and write CR1 to clear STOP flag
mbed_official 181:a4cbdfbbd2f4 349 i2c->SR1;
mbed_official 208:4557f4bb2dd5 350 I2C_Cmd(i2c, ENABLE);
mbed_official 181:a4cbdfbbd2f4 351 }
mbed_official 181:a4cbdfbbd2f4 352 // clear AF
mbed_official 208:4557f4bb2dd5 353 if (I2C_GetFlagStatus(i2c, I2C_FLAG_AF) == SET) {
mbed_official 181:a4cbdfbbd2f4 354 I2C_ClearFlag(i2c, I2C_FLAG_AF);
mbed_official 208:4557f4bb2dd5 355 }
mbed_official 181:a4cbdfbbd2f4 356 }
mbed_official 208:4557f4bb2dd5 357 return (retValue);
mbed_official 56:99eb381a3269 358 }
mbed_official 56:99eb381a3269 359
mbed_official 56:99eb381a3269 360 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 58:3b55b7a41411 361 int count = 0;
mbed_official 174:8bb9f3a33240 362
mbed_official 58:3b55b7a41411 363 // Read all bytes
mbed_official 58:3b55b7a41411 364 for (count = 0; count < length; count++) {
mbed_official 58:3b55b7a41411 365 data[count] = i2c_byte_read(obj, 0);
mbed_official 58:3b55b7a41411 366 }
mbed_official 174:8bb9f3a33240 367
mbed_official 58:3b55b7a41411 368 return count;
mbed_official 56:99eb381a3269 369 }
mbed_official 56:99eb381a3269 370
mbed_official 56:99eb381a3269 371 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 58:3b55b7a41411 372 int count = 0;
mbed_official 174:8bb9f3a33240 373
mbed_official 58:3b55b7a41411 374 // Write all bytes
mbed_official 58:3b55b7a41411 375 for (count = 0; count < length; count++) {
mbed_official 58:3b55b7a41411 376 i2c_byte_write(obj, data[count]);
mbed_official 58:3b55b7a41411 377 }
mbed_official 174:8bb9f3a33240 378
mbed_official 58:3b55b7a41411 379 return count;
mbed_official 56:99eb381a3269 380 }
mbed_official 56:99eb381a3269 381
mbed_official 56:99eb381a3269 382
mbed_official 56:99eb381a3269 383 #endif // DEVICE_I2CSLAVE
mbed_official 56:99eb381a3269 384
mbed_official 56:99eb381a3269 385 #endif // DEVICE_I2C