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_F103RB/i2c_api.c@208:4557f4bb2dd5, 2014-05-23 (annotated)

Committer:
mbed_official
Date:
Fri May 23 10:30:07 2014 +0100
Revision:
208:4557f4bb2dd5
Parent:
181:a4cbdfbbd2f4
Child:
227:7bd0639b8911
Synchronized with git revision bf99806838a107a0a72f7824356e720c46afdc63



Full URL: https://github.com/mbedmicro/mbed/commit/bf99806838a107a0a72f7824356e720c46afdc63/



[NUCLEO_F103RB] Update xxx_free() function + typo corrections

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 56:99eb381a3269 30 #include "i2c_api.h"
mbed_official 56:99eb381a3269 31
mbed_official 56:99eb381a3269 32 #if DEVICE_I2C
mbed_official 56:99eb381a3269 33
mbed_official 56:99eb381a3269 34 #include "cmsis.h"
mbed_official 56:99eb381a3269 35 #include "pinmap.h"
mbed_official 56:99eb381a3269 36 #include "error.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 174:8bb9f3a33240 58 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 56:99eb381a3269 59 // Determine the I2C to use
mbed_official 56:99eb381a3269 60 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 56:99eb381a3269 61 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 56:99eb381a3269 62
mbed_official 56:99eb381a3269 63 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 174:8bb9f3a33240 64
mbed_official 56:99eb381a3269 65 if (obj->i2c == (I2CName)NC) {
mbed_official 56:99eb381a3269 66 error("I2C pin mapping failed");
mbed_official 56:99eb381a3269 67 }
mbed_official 56:99eb381a3269 68
mbed_official 56:99eb381a3269 69 // Enable I2C clock
mbed_official 174:8bb9f3a33240 70 if (obj->i2c == I2C_1) {
mbed_official 56:99eb381a3269 71 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 56:99eb381a3269 72 }
mbed_official 56:99eb381a3269 73 if (obj->i2c == I2C_2) {
mbed_official 56:99eb381a3269 74 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 56:99eb381a3269 75 }
mbed_official 56:99eb381a3269 76
mbed_official 56:99eb381a3269 77 // Configure I2C pins
mbed_official 80:66393a7b209d 78 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 80:66393a7b209d 79 pin_mode(scl, OpenDrain);
mbed_official 56:99eb381a3269 80 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 56:99eb381a3269 81 pin_mode(sda, OpenDrain);
mbed_official 174:8bb9f3a33240 82
mbed_official 56:99eb381a3269 83 // Reset to clear pending flags if any
mbed_official 56:99eb381a3269 84 i2c_reset(obj);
mbed_official 174:8bb9f3a33240 85
mbed_official 56:99eb381a3269 86 // I2C configuration
mbed_official 174:8bb9f3a33240 87 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 56:99eb381a3269 88 }
mbed_official 56:99eb381a3269 89
mbed_official 56:99eb381a3269 90 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 56:99eb381a3269 91 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 92 I2C_InitTypeDef I2C_InitStructure;
mbed_official 174:8bb9f3a33240 93
mbed_official 56:99eb381a3269 94 if ((hz != 0) && (hz <= 400000)) {
mbed_official 80:66393a7b209d 95 I2C_DeInit(i2c);
mbed_official 174:8bb9f3a33240 96
mbed_official 56:99eb381a3269 97 // I2C configuration
mbed_official 167:d5744491c362 98 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 167:d5744491c362 99 I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
mbed_official 167:d5744491c362 100 I2C_InitStructure.I2C_OwnAddress1 = 0;
mbed_official 167:d5744491c362 101 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 56:99eb381a3269 102 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 167:d5744491c362 103 I2C_InitStructure.I2C_ClockSpeed = hz;
mbed_official 80:66393a7b209d 104 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 174:8bb9f3a33240 105
mbed_official 56:99eb381a3269 106 I2C_Cmd(i2c, ENABLE);
mbed_official 56:99eb381a3269 107 }
mbed_official 56:99eb381a3269 108 }
mbed_official 56:99eb381a3269 109
mbed_official 56:99eb381a3269 110 inline int i2c_start(i2c_t *obj) {
mbed_official 56:99eb381a3269 111 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 112 int timeout;
mbed_official 174:8bb9f3a33240 113
mbed_official 56:99eb381a3269 114 I2C_ClearFlag(i2c, I2C_FLAG_AF); // Clear Acknowledge failure flag
mbed_official 174:8bb9f3a33240 115
mbed_official 56:99eb381a3269 116 // Generate the START condition
mbed_official 174:8bb9f3a33240 117 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 174:8bb9f3a33240 118
mbed_official 56:99eb381a3269 119 // Wait the START condition has been correctly sent
mbed_official 56:99eb381a3269 120 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 121 while (I2C_GetFlagStatus(i2c, I2C_FLAG_SB) == RESET) {
mbed_official 80:66393a7b209d 122 timeout--;
mbed_official 80:66393a7b209d 123 if (timeout == 0) {
mbed_official 80:66393a7b209d 124 return 1;
mbed_official 80:66393a7b209d 125 }
mbed_official 56:99eb381a3269 126 }
mbed_official 174:8bb9f3a33240 127
mbed_official 58:3b55b7a41411 128 return 0;
mbed_official 56:99eb381a3269 129 }
mbed_official 56:99eb381a3269 130
mbed_official 56:99eb381a3269 131 inline int i2c_stop(i2c_t *obj) {
mbed_official 56:99eb381a3269 132 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 174:8bb9f3a33240 133
mbed_official 56:99eb381a3269 134 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 174:8bb9f3a33240 135
mbed_official 58:3b55b7a41411 136 return 0;
mbed_official 56:99eb381a3269 137 }
mbed_official 56:99eb381a3269 138
mbed_official 56:99eb381a3269 139 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 56:99eb381a3269 140 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 141 int timeout;
mbed_official 56:99eb381a3269 142 int count;
mbed_official 56:99eb381a3269 143 int value;
mbed_official 174:8bb9f3a33240 144
mbed_official 56:99eb381a3269 145 if (length == 0) return 0;
mbed_official 56:99eb381a3269 146
mbed_official 56:99eb381a3269 147 i2c_start(obj);
mbed_official 56:99eb381a3269 148
mbed_official 56:99eb381a3269 149 // Send slave address for read
mbed_official 174:8bb9f3a33240 150 I2C_Send7bitAddress(i2c, address, I2C_Direction_Receiver);
mbed_official 56:99eb381a3269 151
mbed_official 56:99eb381a3269 152 // Wait address is acknowledged
mbed_official 56:99eb381a3269 153 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 154 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) == ERROR) {
mbed_official 80:66393a7b209d 155 timeout--;
mbed_official 80:66393a7b209d 156 if (timeout == 0) {
mbed_official 80:66393a7b209d 157 return 0;
mbed_official 80:66393a7b209d 158 }
mbed_official 56:99eb381a3269 159 }
mbed_official 174:8bb9f3a33240 160
mbed_official 56:99eb381a3269 161 // Read all bytes except last one
mbed_official 56:99eb381a3269 162 for (count = 0; count < (length - 1); count++) {
mbed_official 56:99eb381a3269 163 value = i2c_byte_read(obj, 0);
mbed_official 56:99eb381a3269 164 data[count] = (char)value;
mbed_official 56:99eb381a3269 165 }
mbed_official 174:8bb9f3a33240 166
mbed_official 56:99eb381a3269 167 // If not repeated start, send stop.
mbed_official 56:99eb381a3269 168 // Warning: must be done BEFORE the data is read.
mbed_official 56:99eb381a3269 169 if (stop) {
mbed_official 56:99eb381a3269 170 i2c_stop(obj);
mbed_official 56:99eb381a3269 171 }
mbed_official 56:99eb381a3269 172
mbed_official 56:99eb381a3269 173 // Read the last byte
mbed_official 56:99eb381a3269 174 value = i2c_byte_read(obj, 1);
mbed_official 56:99eb381a3269 175 data[count] = (char)value;
mbed_official 174:8bb9f3a33240 176
mbed_official 56:99eb381a3269 177 return length;
mbed_official 56:99eb381a3269 178 }
mbed_official 56:99eb381a3269 179
mbed_official 56:99eb381a3269 180 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 56:99eb381a3269 181 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 182 int timeout;
mbed_official 56:99eb381a3269 183 int count;
mbed_official 208:4557f4bb2dd5 184
mbed_official 56:99eb381a3269 185 i2c_start(obj);
mbed_official 56:99eb381a3269 186
mbed_official 56:99eb381a3269 187 // Send slave address for write
mbed_official 56:99eb381a3269 188 I2C_Send7bitAddress(i2c, address, I2C_Direction_Transmitter);
mbed_official 174:8bb9f3a33240 189
mbed_official 56:99eb381a3269 190 // Wait address is acknowledged
mbed_official 56:99eb381a3269 191 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 192 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) == ERROR) {
mbed_official 80:66393a7b209d 193 timeout--;
mbed_official 80:66393a7b209d 194 if (timeout == 0) {
mbed_official 80:66393a7b209d 195 return 0;
mbed_official 80:66393a7b209d 196 }
mbed_official 56:99eb381a3269 197 }
mbed_official 56:99eb381a3269 198
mbed_official 56:99eb381a3269 199 for (count = 0; count < length; count++) {
mbed_official 58:3b55b7a41411 200 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 58:3b55b7a41411 201 i2c_stop(obj);
mbed_official 58:3b55b7a41411 202 return 0;
mbed_official 56:99eb381a3269 203 }
mbed_official 56:99eb381a3269 204 }
mbed_official 56:99eb381a3269 205
mbed_official 56:99eb381a3269 206 // If not repeated start, send stop.
mbed_official 56:99eb381a3269 207 if (stop) {
mbed_official 56:99eb381a3269 208 i2c_stop(obj);
mbed_official 56:99eb381a3269 209 }
mbed_official 56:99eb381a3269 210
mbed_official 56:99eb381a3269 211 return count;
mbed_official 56:99eb381a3269 212 }
mbed_official 56:99eb381a3269 213
mbed_official 56:99eb381a3269 214 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 56:99eb381a3269 215 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 216 uint8_t data;
mbed_official 56:99eb381a3269 217 int timeout;
mbed_official 174:8bb9f3a33240 218
mbed_official 56:99eb381a3269 219 if (last) {
mbed_official 56:99eb381a3269 220 // Don't acknowledge the last byte
mbed_official 56:99eb381a3269 221 I2C_AcknowledgeConfig(i2c, DISABLE);
mbed_official 56:99eb381a3269 222 } else {
mbed_official 56:99eb381a3269 223 // Acknowledge the byte
mbed_official 56:99eb381a3269 224 I2C_AcknowledgeConfig(i2c, ENABLE);
mbed_official 56:99eb381a3269 225 }
mbed_official 56:99eb381a3269 226
mbed_official 56:99eb381a3269 227 // Wait until the byte is received
mbed_official 56:99eb381a3269 228 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 229 while (I2C_GetFlagStatus(i2c, I2C_FLAG_RXNE) == RESET) {
mbed_official 80:66393a7b209d 230 timeout--;
mbed_official 80:66393a7b209d 231 if (timeout == 0) {
mbed_official 80:66393a7b209d 232 return 0;
mbed_official 80:66393a7b209d 233 }
mbed_official 56:99eb381a3269 234 }
mbed_official 56:99eb381a3269 235
mbed_official 56:99eb381a3269 236 data = I2C_ReceiveData(i2c);
mbed_official 174:8bb9f3a33240 237
mbed_official 56:99eb381a3269 238 return (int)data;
mbed_official 56:99eb381a3269 239 }
mbed_official 56:99eb381a3269 240
mbed_official 56:99eb381a3269 241 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 56:99eb381a3269 242 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 243 int timeout;
mbed_official 56:99eb381a3269 244
mbed_official 56:99eb381a3269 245 I2C_SendData(i2c, (uint8_t)data);
mbed_official 56:99eb381a3269 246
mbed_official 56:99eb381a3269 247 // Wait until the byte is transmitted
mbed_official 208:4557f4bb2dd5 248 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 249 while ((I2C_GetFlagStatus(i2c, I2C_FLAG_TXE) == RESET) &&
mbed_official 174:8bb9f3a33240 250 (I2C_GetFlagStatus(i2c, I2C_FLAG_BTF) == RESET)) {
mbed_official 80:66393a7b209d 251 timeout--;
mbed_official 80:66393a7b209d 252 if (timeout == 0) {
mbed_official 58:3b55b7a41411 253 return 0;
mbed_official 56:99eb381a3269 254 }
mbed_official 56:99eb381a3269 255 }
mbed_official 174:8bb9f3a33240 256
mbed_official 58:3b55b7a41411 257 return 1;
mbed_official 56:99eb381a3269 258 }
mbed_official 56:99eb381a3269 259
mbed_official 56:99eb381a3269 260 void i2c_reset(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 261 if (obj->i2c == I2C_1) {
mbed_official 56:99eb381a3269 262 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 56:99eb381a3269 263 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 56:99eb381a3269 264 }
mbed_official 56:99eb381a3269 265 if (obj->i2c == I2C_2) {
mbed_official 56:99eb381a3269 266 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 174:8bb9f3a33240 267 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 56:99eb381a3269 268 }
mbed_official 56:99eb381a3269 269 }
mbed_official 56:99eb381a3269 270
mbed_official 56:99eb381a3269 271 #if DEVICE_I2CSLAVE
mbed_official 56:99eb381a3269 272
mbed_official 56:99eb381a3269 273 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 56:99eb381a3269 274 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 275 uint16_t tmpreg;
mbed_official 174:8bb9f3a33240 276
mbed_official 56:99eb381a3269 277 // Get the old register value
mbed_official 56:99eb381a3269 278 tmpreg = i2c->OAR1;
mbed_official 56:99eb381a3269 279 // Reset address bits
mbed_official 56:99eb381a3269 280 tmpreg &= 0xFC00;
mbed_official 56:99eb381a3269 281 // Set new address
mbed_official 56:99eb381a3269 282 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 56:99eb381a3269 283 // Store the new register value
mbed_official 56:99eb381a3269 284 i2c->OAR1 = tmpreg;
mbed_official 56:99eb381a3269 285 }
mbed_official 56:99eb381a3269 286
mbed_official 56:99eb381a3269 287 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 56:99eb381a3269 288 // Nothing to do
mbed_official 56:99eb381a3269 289 }
mbed_official 56:99eb381a3269 290
mbed_official 58:3b55b7a41411 291 // See I2CSlave.h
mbed_official 58:3b55b7a41411 292 #define NoData 0 // the slave has not been addressed
mbed_official 58:3b55b7a41411 293 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 58:3b55b7a41411 294 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 58:3b55b7a41411 295 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 56:99eb381a3269 296
mbed_official 56:99eb381a3269 297 int i2c_slave_receive(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 298 int retValue = NoData;
mbed_official 181:a4cbdfbbd2f4 299 uint32_t event;
mbed_official 181:a4cbdfbbd2f4 300 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 301
mbed_official 208:4557f4bb2dd5 302 event = I2C_GetLastEvent(i2c);
mbed_official 208:4557f4bb2dd5 303 if (event != 0) {
mbed_official 208:4557f4bb2dd5 304 switch (event) {
mbed_official 181:a4cbdfbbd2f4 305 case I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED:
mbed_official 181:a4cbdfbbd2f4 306 retValue = WriteAddressed;
mbed_official 181:a4cbdfbbd2f4 307 break;
mbed_official 181:a4cbdfbbd2f4 308 case I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED:
mbed_official 181:a4cbdfbbd2f4 309 retValue = ReadAddressed;
mbed_official 181:a4cbdfbbd2f4 310 break;
mbed_official 181:a4cbdfbbd2f4 311 case I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED:
mbed_official 181:a4cbdfbbd2f4 312 retValue = WriteGeneral;
mbed_official 181:a4cbdfbbd2f4 313 break;
mbed_official 181:a4cbdfbbd2f4 314 default:
mbed_official 181:a4cbdfbbd2f4 315 retValue = NoData;
mbed_official 181:a4cbdfbbd2f4 316 break;
mbed_official 181:a4cbdfbbd2f4 317 }
mbed_official 181:a4cbdfbbd2f4 318
mbed_official 208:4557f4bb2dd5 319 // clear ADDR
mbed_official 208:4557f4bb2dd5 320 if ((retValue == WriteAddressed) || (retValue == ReadAddressed)) {
mbed_official 181:a4cbdfbbd2f4 321 // read SR to clear ADDR flag
mbed_official 181:a4cbdfbbd2f4 322 i2c->SR1;
mbed_official 181:a4cbdfbbd2f4 323 i2c->SR2;
mbed_official 181:a4cbdfbbd2f4 324 }
mbed_official 181:a4cbdfbbd2f4 325 // clear stopf
mbed_official 208:4557f4bb2dd5 326 if (I2C_GetFlagStatus(i2c, I2C_FLAG_STOPF) == SET) {
mbed_official 181:a4cbdfbbd2f4 327 // read SR1 and write CR1 to clear STOP flag
mbed_official 181:a4cbdfbbd2f4 328 i2c->SR1;
mbed_official 208:4557f4bb2dd5 329 I2C_Cmd(i2c, ENABLE);
mbed_official 181:a4cbdfbbd2f4 330 }
mbed_official 181:a4cbdfbbd2f4 331 // clear AF
mbed_official 208:4557f4bb2dd5 332 if (I2C_GetFlagStatus(i2c, I2C_FLAG_AF) == SET) {
mbed_official 181:a4cbdfbbd2f4 333 I2C_ClearFlag(i2c, I2C_FLAG_AF);
mbed_official 208:4557f4bb2dd5 334 }
mbed_official 181:a4cbdfbbd2f4 335 }
mbed_official 208:4557f4bb2dd5 336 return (retValue);
mbed_official 56:99eb381a3269 337 }
mbed_official 56:99eb381a3269 338
mbed_official 56:99eb381a3269 339 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 58:3b55b7a41411 340 int count = 0;
mbed_official 174:8bb9f3a33240 341
mbed_official 58:3b55b7a41411 342 // Read all bytes
mbed_official 58:3b55b7a41411 343 for (count = 0; count < length; count++) {
mbed_official 58:3b55b7a41411 344 data[count] = i2c_byte_read(obj, 0);
mbed_official 58:3b55b7a41411 345 }
mbed_official 174:8bb9f3a33240 346
mbed_official 58:3b55b7a41411 347 return count;
mbed_official 56:99eb381a3269 348 }
mbed_official 56:99eb381a3269 349
mbed_official 56:99eb381a3269 350 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 58:3b55b7a41411 351 int count = 0;
mbed_official 174:8bb9f3a33240 352
mbed_official 58:3b55b7a41411 353 // Write all bytes
mbed_official 58:3b55b7a41411 354 for (count = 0; count < length; count++) {
mbed_official 58:3b55b7a41411 355 i2c_byte_write(obj, data[count]);
mbed_official 58:3b55b7a41411 356 }
mbed_official 174:8bb9f3a33240 357
mbed_official 58:3b55b7a41411 358 return count;
mbed_official 56:99eb381a3269 359 }
mbed_official 56:99eb381a3269 360
mbed_official 56:99eb381a3269 361
mbed_official 56:99eb381a3269 362 #endif // DEVICE_I2CSLAVE
mbed_official 56:99eb381a3269 363
mbed_official 56:99eb381a3269 364 #endif // DEVICE_I2C