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_L152RE/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 76:aeb1df146756 1 /* mbed Microcontroller Library
mbed_official 76:aeb1df146756 2 *******************************************************************************
mbed_official 76:aeb1df146756 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 76:aeb1df146756 4 * All rights reserved.
mbed_official 76:aeb1df146756 5 *
mbed_official 76:aeb1df146756 6 * Redistribution and use in source and binary forms, with or without
mbed_official 76:aeb1df146756 7 * modification, are permitted provided that the following conditions are met:
mbed_official 76:aeb1df146756 8 *
mbed_official 76:aeb1df146756 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 76:aeb1df146756 10 * this list of conditions and the following disclaimer.
mbed_official 76:aeb1df146756 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 76:aeb1df146756 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 76:aeb1df146756 13 * and/or other materials provided with the distribution.
mbed_official 76:aeb1df146756 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 76:aeb1df146756 15 * may be used to endorse or promote products derived from this software
mbed_official 76:aeb1df146756 16 * without specific prior written permission.
mbed_official 76:aeb1df146756 17 *
mbed_official 76:aeb1df146756 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 76:aeb1df146756 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 76:aeb1df146756 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 76:aeb1df146756 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 76:aeb1df146756 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 76:aeb1df146756 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 76:aeb1df146756 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 76:aeb1df146756 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 76:aeb1df146756 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 76:aeb1df146756 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 76:aeb1df146756 28 *******************************************************************************
mbed_official 76:aeb1df146756 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 76:aeb1df146756 31 #include "i2c_api.h"
mbed_official 76:aeb1df146756 32
mbed_official 76:aeb1df146756 33 #if DEVICE_I2C
mbed_official 76:aeb1df146756 34
mbed_official 76:aeb1df146756 35 #include "cmsis.h"
mbed_official 76:aeb1df146756 36 #include "pinmap.h"
mbed_official 227:7bd0639b8911 37
mbed_official 76:aeb1df146756 38
mbed_official 76:aeb1df146756 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 174:8bb9f3a33240 40 not based on accurate values, they just guarantee that the application will
mbed_official 174:8bb9f3a33240 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 76:aeb1df146756 42 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 76:aeb1df146756 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 76:aeb1df146756 44
mbed_official 76:aeb1df146756 45 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 118:b44c45162f28 46 {PB_7, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C1)},
mbed_official 80:66393a7b209d 47 {PB_9, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C1)},
mbed_official 118:b44c45162f28 48 {PB_11, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C2)},
mbed_official 76:aeb1df146756 49 {NC, NC, 0}
mbed_official 76:aeb1df146756 50 };
mbed_official 76:aeb1df146756 51
mbed_official 76:aeb1df146756 52 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 118:b44c45162f28 53 {PB_6, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C1)},
mbed_official 80:66393a7b209d 54 {PB_8, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C1)},
mbed_official 118:b44c45162f28 55 {PB_10, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C2)},
mbed_official 76:aeb1df146756 56 {NC, NC, 0}
mbed_official 76:aeb1df146756 57 };
mbed_official 76:aeb1df146756 58
mbed_official 306:1f0269907d8b 59 int i2c1_inited = 0;
mbed_official 306:1f0269907d8b 60 int i2c2_inited = 0;
mbed_official 306:1f0269907d8b 61
mbed_official 174:8bb9f3a33240 62 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 76:aeb1df146756 63 // Determine the I2C to use
mbed_official 76:aeb1df146756 64 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 76:aeb1df146756 65 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 76:aeb1df146756 66
mbed_official 76:aeb1df146756 67 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 68 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 76:aeb1df146756 69
mbed_official 306:1f0269907d8b 70 // Enable I2C1 clock and pinout if not done
mbed_official 306:1f0269907d8b 71 if ((obj->i2c == I2C_1)&& !i2c1_inited) {
mbed_official 306:1f0269907d8b 72 i2c1_inited = 1;
mbed_official 76:aeb1df146756 73 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 306:1f0269907d8b 74 // Configure I2C pins
mbed_official 306:1f0269907d8b 75 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 306:1f0269907d8b 76 pin_mode(scl, OpenDrain);
mbed_official 306:1f0269907d8b 77 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 306:1f0269907d8b 78 pin_mode(sda, OpenDrain);
mbed_official 76:aeb1df146756 79 }
mbed_official 76:aeb1df146756 80
mbed_official 306:1f0269907d8b 81 // Enable I2C2 clock and pinout if not done
mbed_official 306:1f0269907d8b 82 if ((obj->i2c == I2C_2)&& !i2c2_inited) {
mbed_official 306:1f0269907d8b 83 i2c2_inited = 1;
mbed_official 306:1f0269907d8b 84 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 306:1f0269907d8b 85 // Configure I2C pins
mbed_official 306:1f0269907d8b 86 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 306:1f0269907d8b 87 pin_mode(scl, OpenDrain);
mbed_official 306:1f0269907d8b 88 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 306:1f0269907d8b 89 pin_mode(sda, OpenDrain);
mbed_official 306:1f0269907d8b 90 }
mbed_official 174:8bb9f3a33240 91
mbed_official 76:aeb1df146756 92 // Reset to clear pending flags if any
mbed_official 76:aeb1df146756 93 i2c_reset(obj);
mbed_official 174:8bb9f3a33240 94
mbed_official 76:aeb1df146756 95 // I2C configuration
mbed_official 174:8bb9f3a33240 96 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 76:aeb1df146756 97 }
mbed_official 76:aeb1df146756 98
mbed_official 76:aeb1df146756 99 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 76:aeb1df146756 100 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 101 I2C_InitTypeDef I2C_InitStructure;
mbed_official 306:1f0269907d8b 102 int timeout;
mbed_official 129:0182c99221bc 103
mbed_official 129:0182c99221bc 104 if (hz == 0) return;
mbed_official 129:0182c99221bc 105 if (hz > 400000) hz = 400000;
mbed_official 129:0182c99221bc 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 129:0182c99221bc 111 /* Warning: To use the I2C at 400 kHz (in fast mode), the PCLK1 frequency
mbed_official 129:0182c99221bc 112 (I2C peripheral input clock) must be a multiple of 10 MHz.
mbed_official 129:0182c99221bc 113 With the actual clock configuration, the max frequency is measured at 296 kHz */
mbed_official 174:8bb9f3a33240 114
mbed_official 129:0182c99221bc 115 // I2C configuration
mbed_official 129:0182c99221bc 116 I2C_DeInit(i2c);
mbed_official 129:0182c99221bc 117 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 129:0182c99221bc 118 I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
mbed_official 129:0182c99221bc 119 I2C_InitStructure.I2C_OwnAddress1 = 0;
mbed_official 129:0182c99221bc 120 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 129:0182c99221bc 121 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 129:0182c99221bc 122 I2C_InitStructure.I2C_ClockSpeed = hz;
mbed_official 129:0182c99221bc 123 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 129:0182c99221bc 124 I2C_Cmd(i2c, ENABLE);
mbed_official 76:aeb1df146756 125 }
mbed_official 76:aeb1df146756 126
mbed_official 76:aeb1df146756 127 inline int i2c_start(i2c_t *obj) {
mbed_official 76:aeb1df146756 128 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 129 int timeout;
mbed_official 174:8bb9f3a33240 130
mbed_official 76:aeb1df146756 131 I2C_ClearFlag(i2c, I2C_FLAG_AF); // Clear Acknowledge failure flag
mbed_official 174:8bb9f3a33240 132
mbed_official 76:aeb1df146756 133 // Generate the START condition
mbed_official 174:8bb9f3a33240 134 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 174:8bb9f3a33240 135
mbed_official 76:aeb1df146756 136 // Wait the START condition has been correctly sent
mbed_official 76:aeb1df146756 137 timeout = FLAG_TIMEOUT;
mbed_official 76:aeb1df146756 138 while (I2C_GetFlagStatus(i2c, I2C_FLAG_SB) == RESET) {
mbed_official 80:66393a7b209d 139 timeout--;
mbed_official 80:66393a7b209d 140 if (timeout == 0) {
mbed_official 80:66393a7b209d 141 return 1;
mbed_official 80:66393a7b209d 142 }
mbed_official 76:aeb1df146756 143 }
mbed_official 174:8bb9f3a33240 144
mbed_official 76:aeb1df146756 145 return 0;
mbed_official 76:aeb1df146756 146 }
mbed_official 76:aeb1df146756 147
mbed_official 76:aeb1df146756 148 inline int i2c_stop(i2c_t *obj) {
mbed_official 76:aeb1df146756 149 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 129:0182c99221bc 150 int timeout;
mbed_official 129:0182c99221bc 151 volatile int temp;
mbed_official 174:8bb9f3a33240 152
mbed_official 129:0182c99221bc 153 if (I2C_GetFlagStatus(i2c, I2C_FLAG_MSL) == RESET) {
mbed_official 129:0182c99221bc 154 timeout = LONG_TIMEOUT;
mbed_official 174:8bb9f3a33240 155 // wait for STOP
mbed_official 129:0182c99221bc 156 while (I2C_GetFlagStatus(i2c, I2C_FLAG_STOPF) == RESET) {
mbed_official 129:0182c99221bc 157 timeout--;
mbed_official 129:0182c99221bc 158 if (timeout == 0) {
mbed_official 129:0182c99221bc 159 return 0;
mbed_official 129:0182c99221bc 160 }
mbed_official 129:0182c99221bc 161 }
mbed_official 129:0182c99221bc 162 temp = i2c->SR1;
mbed_official 129:0182c99221bc 163 I2C_Cmd(i2c, ENABLE);
mbed_official 174:8bb9f3a33240 164 } else {
mbed_official 129:0182c99221bc 165 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 129:0182c99221bc 166 }
mbed_official 174:8bb9f3a33240 167
mbed_official 76:aeb1df146756 168 return 0;
mbed_official 76:aeb1df146756 169 }
mbed_official 76:aeb1df146756 170
mbed_official 76:aeb1df146756 171 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 76:aeb1df146756 172 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 173 int timeout;
mbed_official 76:aeb1df146756 174 int count;
mbed_official 76:aeb1df146756 175 int value;
mbed_official 174:8bb9f3a33240 176
mbed_official 76:aeb1df146756 177 i2c_start(obj);
mbed_official 76:aeb1df146756 178
mbed_official 76:aeb1df146756 179 // Send slave address for read
mbed_official 174:8bb9f3a33240 180 I2C_Send7bitAddress(i2c, address, I2C_Direction_Receiver);
mbed_official 76:aeb1df146756 181
mbed_official 76:aeb1df146756 182 // Wait address is acknowledged
mbed_official 76:aeb1df146756 183 timeout = FLAG_TIMEOUT;
mbed_official 76:aeb1df146756 184 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) == ERROR) {
mbed_official 80:66393a7b209d 185 timeout--;
mbed_official 80:66393a7b209d 186 if (timeout == 0) {
mbed_official 247:135e3186a638 187 return -1;
mbed_official 80:66393a7b209d 188 }
mbed_official 76:aeb1df146756 189 }
mbed_official 174:8bb9f3a33240 190
mbed_official 76:aeb1df146756 191 // Read all bytes except last one
mbed_official 76:aeb1df146756 192 for (count = 0; count < (length - 1); count++) {
mbed_official 76:aeb1df146756 193 value = i2c_byte_read(obj, 0);
mbed_official 76:aeb1df146756 194 data[count] = (char)value;
mbed_official 76:aeb1df146756 195 }
mbed_official 174:8bb9f3a33240 196
mbed_official 76:aeb1df146756 197 // If not repeated start, send stop.
mbed_official 76:aeb1df146756 198 // Warning: must be done BEFORE the data is read.
mbed_official 76:aeb1df146756 199 if (stop) {
mbed_official 76:aeb1df146756 200 i2c_stop(obj);
mbed_official 76:aeb1df146756 201 }
mbed_official 76:aeb1df146756 202
mbed_official 76:aeb1df146756 203 // Read the last byte
mbed_official 76:aeb1df146756 204 value = i2c_byte_read(obj, 1);
mbed_official 76:aeb1df146756 205 data[count] = (char)value;
mbed_official 174:8bb9f3a33240 206
mbed_official 76:aeb1df146756 207 return length;
mbed_official 76:aeb1df146756 208 }
mbed_official 76:aeb1df146756 209
mbed_official 76:aeb1df146756 210 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 76:aeb1df146756 211 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 212 int timeout;
mbed_official 76:aeb1df146756 213 int count;
mbed_official 76:aeb1df146756 214
mbed_official 76:aeb1df146756 215 i2c_start(obj);
mbed_official 76:aeb1df146756 216
mbed_official 76:aeb1df146756 217 // Send slave address for write
mbed_official 76:aeb1df146756 218 I2C_Send7bitAddress(i2c, address, I2C_Direction_Transmitter);
mbed_official 174:8bb9f3a33240 219
mbed_official 76:aeb1df146756 220 // Wait address is acknowledged
mbed_official 76:aeb1df146756 221 timeout = FLAG_TIMEOUT;
mbed_official 76:aeb1df146756 222 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) == ERROR) {
mbed_official 80:66393a7b209d 223 timeout--;
mbed_official 80:66393a7b209d 224 if (timeout == 0) {
mbed_official 247:135e3186a638 225 return -1;
mbed_official 80:66393a7b209d 226 }
mbed_official 76:aeb1df146756 227 }
mbed_official 76:aeb1df146756 228
mbed_official 76:aeb1df146756 229 for (count = 0; count < length; count++) {
mbed_official 76:aeb1df146756 230 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 76:aeb1df146756 231 i2c_stop(obj);
mbed_official 247:135e3186a638 232 return -1;
mbed_official 76:aeb1df146756 233 }
mbed_official 76:aeb1df146756 234 }
mbed_official 76:aeb1df146756 235
mbed_official 76:aeb1df146756 236 // If not repeated start, send stop.
mbed_official 76:aeb1df146756 237 if (stop) {
mbed_official 76:aeb1df146756 238 i2c_stop(obj);
mbed_official 76:aeb1df146756 239 }
mbed_official 76:aeb1df146756 240
mbed_official 76:aeb1df146756 241 return count;
mbed_official 76:aeb1df146756 242 }
mbed_official 76:aeb1df146756 243
mbed_official 76:aeb1df146756 244 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 76:aeb1df146756 245 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 246 uint8_t data;
mbed_official 76:aeb1df146756 247 int timeout;
mbed_official 174:8bb9f3a33240 248
mbed_official 76:aeb1df146756 249 if (last) {
mbed_official 76:aeb1df146756 250 // Don't acknowledge the last byte
mbed_official 76:aeb1df146756 251 I2C_AcknowledgeConfig(i2c, DISABLE);
mbed_official 76:aeb1df146756 252 } else {
mbed_official 76:aeb1df146756 253 // Acknowledge the byte
mbed_official 76:aeb1df146756 254 I2C_AcknowledgeConfig(i2c, ENABLE);
mbed_official 76:aeb1df146756 255 }
mbed_official 76:aeb1df146756 256
mbed_official 76:aeb1df146756 257 // Wait until the byte is received
mbed_official 76:aeb1df146756 258 timeout = FLAG_TIMEOUT;
mbed_official 76:aeb1df146756 259 while (I2C_GetFlagStatus(i2c, I2C_FLAG_RXNE) == RESET) {
mbed_official 80:66393a7b209d 260 timeout--;
mbed_official 80:66393a7b209d 261 if (timeout == 0) {
mbed_official 247:135e3186a638 262 return -1;
mbed_official 80:66393a7b209d 263 }
mbed_official 76:aeb1df146756 264 }
mbed_official 76:aeb1df146756 265
mbed_official 76:aeb1df146756 266 data = I2C_ReceiveData(i2c);
mbed_official 174:8bb9f3a33240 267
mbed_official 76:aeb1df146756 268 return (int)data;
mbed_official 76:aeb1df146756 269 }
mbed_official 76:aeb1df146756 270
mbed_official 76:aeb1df146756 271 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 76:aeb1df146756 272 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 273 int timeout;
mbed_official 76:aeb1df146756 274
mbed_official 76:aeb1df146756 275 I2C_SendData(i2c, (uint8_t)data);
mbed_official 76:aeb1df146756 276
mbed_official 76:aeb1df146756 277 // Wait until the byte is transmitted
mbed_official 129:0182c99221bc 278 timeout = FLAG_TIMEOUT;
mbed_official 76:aeb1df146756 279 while ((I2C_GetFlagStatus(i2c, I2C_FLAG_TXE) == RESET) &&
mbed_official 174:8bb9f3a33240 280 (I2C_GetFlagStatus(i2c, I2C_FLAG_BTF) == RESET)) {
mbed_official 80:66393a7b209d 281 timeout--;
mbed_official 80:66393a7b209d 282 if (timeout == 0) {
mbed_official 76:aeb1df146756 283 return 0;
mbed_official 76:aeb1df146756 284 }
mbed_official 76:aeb1df146756 285 }
mbed_official 174:8bb9f3a33240 286
mbed_official 76:aeb1df146756 287 return 1;
mbed_official 76:aeb1df146756 288 }
mbed_official 76:aeb1df146756 289
mbed_official 76:aeb1df146756 290 void i2c_reset(i2c_t *obj) {
mbed_official 306:1f0269907d8b 291 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 306:1f0269907d8b 292 int timeout;
mbed_official 306:1f0269907d8b 293
mbed_official 306:1f0269907d8b 294 // wait before reset
mbed_official 306:1f0269907d8b 295 timeout = LONG_TIMEOUT;
mbed_official 306:1f0269907d8b 296 while((I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 306:1f0269907d8b 297
mbed_official 174:8bb9f3a33240 298 if (obj->i2c == I2C_1) {
mbed_official 76:aeb1df146756 299 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 76:aeb1df146756 300 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 76:aeb1df146756 301 }
mbed_official 76:aeb1df146756 302 if (obj->i2c == I2C_2) {
mbed_official 76:aeb1df146756 303 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 174:8bb9f3a33240 304 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 76:aeb1df146756 305 }
mbed_official 76:aeb1df146756 306 }
mbed_official 76:aeb1df146756 307
mbed_official 76:aeb1df146756 308 #if DEVICE_I2CSLAVE
mbed_official 76:aeb1df146756 309
mbed_official 76:aeb1df146756 310 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 76:aeb1df146756 311 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 312 uint16_t tmpreg;
mbed_official 174:8bb9f3a33240 313
mbed_official 76:aeb1df146756 314 // Get the old register value
mbed_official 76:aeb1df146756 315 tmpreg = i2c->OAR1;
mbed_official 76:aeb1df146756 316 // Reset address bits
mbed_official 76:aeb1df146756 317 tmpreg &= 0xFC00;
mbed_official 76:aeb1df146756 318 // Set new address
mbed_official 76:aeb1df146756 319 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 76:aeb1df146756 320 // Store the new register value
mbed_official 76:aeb1df146756 321 i2c->OAR1 = tmpreg;
mbed_official 76:aeb1df146756 322 }
mbed_official 76:aeb1df146756 323
mbed_official 76:aeb1df146756 324 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 76:aeb1df146756 325 // Nothing to do
mbed_official 76:aeb1df146756 326 }
mbed_official 76:aeb1df146756 327
mbed_official 76:aeb1df146756 328 // See I2CSlave.h
mbed_official 76:aeb1df146756 329 #define NoData 0 // the slave has not been addressed
mbed_official 76:aeb1df146756 330 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 76:aeb1df146756 331 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 76:aeb1df146756 332 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 76:aeb1df146756 333
mbed_official 76:aeb1df146756 334 int i2c_slave_receive(i2c_t *obj) {
mbed_official 190:bde2479eef9e 335 int retValue = NoData;
mbed_official 190:bde2479eef9e 336 uint32_t event;
mbed_official 190:bde2479eef9e 337 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 190:bde2479eef9e 338
mbed_official 215:83cf97a28428 339 event = I2C_GetLastEvent(i2c);
mbed_official 215:83cf97a28428 340 if (event != 0) {
mbed_official 215:83cf97a28428 341 switch (event) {
mbed_official 190:bde2479eef9e 342 case I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED:
mbed_official 190:bde2479eef9e 343 retValue = WriteAddressed;
mbed_official 190:bde2479eef9e 344 break;
mbed_official 190:bde2479eef9e 345 case I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED:
mbed_official 190:bde2479eef9e 346 retValue = ReadAddressed;
mbed_official 190:bde2479eef9e 347 break;
mbed_official 190:bde2479eef9e 348 case I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED:
mbed_official 190:bde2479eef9e 349 retValue = WriteGeneral;
mbed_official 190:bde2479eef9e 350 break;
mbed_official 190:bde2479eef9e 351 default:
mbed_official 190:bde2479eef9e 352 retValue = NoData;
mbed_official 190:bde2479eef9e 353 break;
mbed_official 190:bde2479eef9e 354 }
mbed_official 190:bde2479eef9e 355
mbed_official 215:83cf97a28428 356 // clear ADDR
mbed_official 215:83cf97a28428 357 if ((retValue == WriteAddressed) || (retValue == ReadAddressed)) {
mbed_official 190:bde2479eef9e 358 i2c->SR1;// read status register 1
mbed_official 190:bde2479eef9e 359 i2c->SR2;// read status register 2
mbed_official 190:bde2479eef9e 360 }
mbed_official 190:bde2479eef9e 361 // clear stopf
mbed_official 215:83cf97a28428 362 if (I2C_GetFlagStatus(i2c, I2C_FLAG_STOPF) == SET) {
mbed_official 190:bde2479eef9e 363 i2c->SR1;// read status register 1
mbed_official 215:83cf97a28428 364 I2C_Cmd(i2c, ENABLE);
mbed_official 190:bde2479eef9e 365 }
mbed_official 190:bde2479eef9e 366 // clear AF
mbed_official 215:83cf97a28428 367 if (I2C_GetFlagStatus(i2c, I2C_FLAG_AF) == SET) {
mbed_official 190:bde2479eef9e 368 I2C_ClearFlag(i2c, I2C_FLAG_AF);
mbed_official 215:83cf97a28428 369 }
mbed_official 190:bde2479eef9e 370 }
mbed_official 215:83cf97a28428 371 return (retValue);
mbed_official 76:aeb1df146756 372 }
mbed_official 76:aeb1df146756 373
mbed_official 76:aeb1df146756 374 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 76:aeb1df146756 375 int count = 0;
mbed_official 174:8bb9f3a33240 376
mbed_official 76:aeb1df146756 377 // Read all bytes
mbed_official 76:aeb1df146756 378 for (count = 0; count < length; count++) {
mbed_official 76:aeb1df146756 379 data[count] = i2c_byte_read(obj, 0);
mbed_official 76:aeb1df146756 380 }
mbed_official 174:8bb9f3a33240 381
mbed_official 76:aeb1df146756 382 return count;
mbed_official 76:aeb1df146756 383 }
mbed_official 76:aeb1df146756 384
mbed_official 76:aeb1df146756 385 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 76:aeb1df146756 386 int count = 0;
mbed_official 174:8bb9f3a33240 387
mbed_official 76:aeb1df146756 388 // Write all bytes
mbed_official 76:aeb1df146756 389 for (count = 0; count < length; count++) {
mbed_official 76:aeb1df146756 390 i2c_byte_write(obj, data[count]);
mbed_official 76:aeb1df146756 391 }
mbed_official 174:8bb9f3a33240 392
mbed_official 76:aeb1df146756 393 return count;
mbed_official 76:aeb1df146756 394 }
mbed_official 76:aeb1df146756 395
mbed_official 76:aeb1df146756 396
mbed_official 76:aeb1df146756 397 #endif // DEVICE_I2CSLAVE
mbed_official 76:aeb1df146756 398
mbed_official 76:aeb1df146756 399 #endif // DEVICE_I2C