Peter Drescher / mbed-F401

mbed library with additional peripherals for ST F401 board

Fork of mbed-src by mbed official

This mbed LIB has additional peripherals for ST F401 board

  • UART2 : PA_3 rx, PA_2 tx
  • UART3 : PC_7 rx, PC_6 tx
  • I2C2 : PB_3 SDA, PB_10 SCL
  • I2C3 : PB_4 SDA, PA_8 SCL

targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/i2c_api.c@56:99eb381a3269, 2013-12-12 (annotated)

Committer:
mbed_official
Date:
Thu Dec 12 10:45:05 2013 +0000
Revision:
56:99eb381a3269
Child:
57:c7e83bc5e387
Synchronized with git revision bd51e4eb73a1706f1d5379ec5cebcbd6d978cb4f



Full URL: https://github.com/mbedmicro/mbed/commit/bd51e4eb73a1706f1d5379ec5cebcbd6d978cb4f/



[NUCLEO_F103RB] Add I2C master, code cleanup, ...

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 56:99eb381a3269 1 /* mbed Microcontroller Library
mbed_official 56:99eb381a3269 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 56:99eb381a3269 3 *
mbed_official 56:99eb381a3269 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 56:99eb381a3269 5 * you may not use this file except in compliance with the License.
mbed_official 56:99eb381a3269 6 * You may obtain a copy of the License at
mbed_official 56:99eb381a3269 7 *
mbed_official 56:99eb381a3269 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 56:99eb381a3269 9 *
mbed_official 56:99eb381a3269 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 56:99eb381a3269 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 56:99eb381a3269 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 56:99eb381a3269 13 * See the License for the specific language governing permissions and
mbed_official 56:99eb381a3269 14 * limitations under the License.
mbed_official 56:99eb381a3269 15 */
mbed_official 56:99eb381a3269 16 #include "i2c_api.h"
mbed_official 56:99eb381a3269 17
mbed_official 56:99eb381a3269 18 #if DEVICE_I2C
mbed_official 56:99eb381a3269 19
mbed_official 56:99eb381a3269 20 #include "cmsis.h"
mbed_official 56:99eb381a3269 21 #include "pinmap.h"
mbed_official 56:99eb381a3269 22 #include "error.h"
mbed_official 56:99eb381a3269 23
mbed_official 56:99eb381a3269 24 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 56:99eb381a3269 25 not based on accurate values, they just guarantee that the application will
mbed_official 56:99eb381a3269 26 not remain stuck if the I2C communication is corrupted. */
mbed_official 56:99eb381a3269 27 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 56:99eb381a3269 28 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 56:99eb381a3269 29
mbed_official 56:99eb381a3269 30 // Functions exit codes
mbed_official 56:99eb381a3269 31 #define EXIT_OK (0)
mbed_official 56:99eb381a3269 32 #define EXIT_FAIL (1)
mbed_official 56:99eb381a3269 33 #define EXIT_TIMEOUT (0xFFFFFFFF)
mbed_official 56:99eb381a3269 34
mbed_official 56:99eb381a3269 35 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 56:99eb381a3269 36 //{PB_7, I2C_1, STM_PIN_DATA(GPIO_Mode_AF_OD, 0)}, // Cannot be used due to TIM4
mbed_official 56:99eb381a3269 37 {PB_9, I2C_1, STM_PIN_DATA(GPIO_Mode_AF_OD, 7)}, // GPIO_Remap_I2C1
mbed_official 56:99eb381a3269 38 {NC, NC, 0}
mbed_official 56:99eb381a3269 39 };
mbed_official 56:99eb381a3269 40
mbed_official 56:99eb381a3269 41 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 56:99eb381a3269 42 //{PB_6, I2C_1, STM_PIN_DATA(GPIO_Mode_AF_OD, 0)}, // // Cannot be used due to TIM4
mbed_official 56:99eb381a3269 43 {PB_8, I2C_1, STM_PIN_DATA(GPIO_Mode_AF_OD, 7)}, // GPIO_Remap_I2C1
mbed_official 56:99eb381a3269 44 {NC, NC, 0}
mbed_official 56:99eb381a3269 45 };
mbed_official 56:99eb381a3269 46
mbed_official 56:99eb381a3269 47 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 56:99eb381a3269 48 // Determine the I2C to use
mbed_official 56:99eb381a3269 49 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 56:99eb381a3269 50 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 56:99eb381a3269 51
mbed_official 56:99eb381a3269 52 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 56:99eb381a3269 53
mbed_official 56:99eb381a3269 54 if (obj->i2c == (I2CName)NC) {
mbed_official 56:99eb381a3269 55 error("I2C pin mapping failed");
mbed_official 56:99eb381a3269 56 }
mbed_official 56:99eb381a3269 57
mbed_official 56:99eb381a3269 58 // Enable I2C clock
mbed_official 56:99eb381a3269 59 if (obj->i2c == I2C_1) {
mbed_official 56:99eb381a3269 60 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 56:99eb381a3269 61 }
mbed_official 56:99eb381a3269 62 if (obj->i2c == I2C_2) {
mbed_official 56:99eb381a3269 63 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 56:99eb381a3269 64 }
mbed_official 56:99eb381a3269 65
mbed_official 56:99eb381a3269 66 // Configure I2C pins
mbed_official 56:99eb381a3269 67 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 56:99eb381a3269 68 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 56:99eb381a3269 69 pin_mode(sda, OpenDrain);
mbed_official 56:99eb381a3269 70 pin_mode(scl, OpenDrain);
mbed_official 56:99eb381a3269 71
mbed_official 56:99eb381a3269 72 // Reset to clear pending flags if any
mbed_official 56:99eb381a3269 73 i2c_reset(obj);
mbed_official 56:99eb381a3269 74
mbed_official 56:99eb381a3269 75 // I2C configuration
mbed_official 56:99eb381a3269 76 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 56:99eb381a3269 77 }
mbed_official 56:99eb381a3269 78
mbed_official 56:99eb381a3269 79 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 56:99eb381a3269 80 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 81 I2C_InitTypeDef I2C_InitStructure;
mbed_official 56:99eb381a3269 82
mbed_official 56:99eb381a3269 83 if ((hz != 0) && (hz <= 400000)) {
mbed_official 56:99eb381a3269 84 // I2C configuration
mbed_official 56:99eb381a3269 85 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 56:99eb381a3269 86 I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
mbed_official 56:99eb381a3269 87 I2C_InitStructure.I2C_OwnAddress1 = 0;
mbed_official 56:99eb381a3269 88 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 56:99eb381a3269 89 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 56:99eb381a3269 90 I2C_InitStructure.I2C_ClockSpeed = hz;
mbed_official 56:99eb381a3269 91 I2C_Cmd(i2c, ENABLE);
mbed_official 56:99eb381a3269 92 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 56:99eb381a3269 93 }
mbed_official 56:99eb381a3269 94 }
mbed_official 56:99eb381a3269 95
mbed_official 56:99eb381a3269 96 inline int i2c_start(i2c_t *obj) {
mbed_official 56:99eb381a3269 97 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 98 int timeout;
mbed_official 56:99eb381a3269 99
mbed_official 56:99eb381a3269 100 I2C_ClearFlag(i2c, I2C_FLAG_AF); // Clear Acknowledge failure flag
mbed_official 56:99eb381a3269 101
mbed_official 56:99eb381a3269 102 // Generate the START condition
mbed_official 56:99eb381a3269 103 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 56:99eb381a3269 104
mbed_official 56:99eb381a3269 105 // Wait the START condition has been correctly sent
mbed_official 56:99eb381a3269 106 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 107 //while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_MODE_SELECT) == ERROR) {
mbed_official 56:99eb381a3269 108 while (I2C_GetFlagStatus(i2c, I2C_FLAG_SB) == RESET) {
mbed_official 56:99eb381a3269 109 if ((timeout--) == 0) {
mbed_official 56:99eb381a3269 110 return EXIT_TIMEOUT;
mbed_official 56:99eb381a3269 111 }
mbed_official 56:99eb381a3269 112 }
mbed_official 56:99eb381a3269 113
mbed_official 56:99eb381a3269 114 return EXIT_OK;
mbed_official 56:99eb381a3269 115 }
mbed_official 56:99eb381a3269 116
mbed_official 56:99eb381a3269 117 inline int i2c_stop(i2c_t *obj) {
mbed_official 56:99eb381a3269 118 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 119 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 56:99eb381a3269 120 return EXIT_OK;
mbed_official 56:99eb381a3269 121 }
mbed_official 56:99eb381a3269 122
mbed_official 56:99eb381a3269 123 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 56:99eb381a3269 124 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 125 int timeout;
mbed_official 56:99eb381a3269 126 int count;
mbed_official 56:99eb381a3269 127 int value;
mbed_official 56:99eb381a3269 128
mbed_official 56:99eb381a3269 129 if (length == 0) return 0;
mbed_official 56:99eb381a3269 130
mbed_official 56:99eb381a3269 131 /*
mbed_official 56:99eb381a3269 132 // Wait until the bus is not busy anymore
mbed_official 56:99eb381a3269 133 timeout = LONG_TIMEOUT;
mbed_official 56:99eb381a3269 134 while (I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY) == SET) {
mbed_official 56:99eb381a3269 135 if ((timeout--) == 0) {
mbed_official 56:99eb381a3269 136 return EXIT_TIMEOUT;
mbed_official 56:99eb381a3269 137 }
mbed_official 56:99eb381a3269 138 }
mbed_official 56:99eb381a3269 139 */
mbed_official 56:99eb381a3269 140
mbed_official 56:99eb381a3269 141 i2c_start(obj);
mbed_official 56:99eb381a3269 142
mbed_official 56:99eb381a3269 143 // Send slave address for read
mbed_official 56:99eb381a3269 144 I2C_Send7bitAddress(i2c, address, I2C_Direction_Receiver);
mbed_official 56:99eb381a3269 145
mbed_official 56:99eb381a3269 146 // Wait address is acknowledged
mbed_official 56:99eb381a3269 147 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 148 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) == ERROR) {
mbed_official 56:99eb381a3269 149 if ((timeout--) == 0) {
mbed_official 56:99eb381a3269 150 return EXIT_TIMEOUT;
mbed_official 56:99eb381a3269 151 }
mbed_official 56:99eb381a3269 152 }
mbed_official 56:99eb381a3269 153
mbed_official 56:99eb381a3269 154 // Read all bytes except last one
mbed_official 56:99eb381a3269 155 for (count = 0; count < (length - 1); count++) {
mbed_official 56:99eb381a3269 156 value = i2c_byte_read(obj, 0);
mbed_official 56:99eb381a3269 157 data[count] = (char)value;
mbed_official 56:99eb381a3269 158 }
mbed_official 56:99eb381a3269 159
mbed_official 56:99eb381a3269 160 // If not repeated start, send stop.
mbed_official 56:99eb381a3269 161 // Warning: must be done BEFORE the data is read.
mbed_official 56:99eb381a3269 162 if (stop) {
mbed_official 56:99eb381a3269 163 i2c_stop(obj);
mbed_official 56:99eb381a3269 164 }
mbed_official 56:99eb381a3269 165
mbed_official 56:99eb381a3269 166 // Read the last byte
mbed_official 56:99eb381a3269 167 value = i2c_byte_read(obj, 1);
mbed_official 56:99eb381a3269 168 data[count] = (char)value;
mbed_official 56:99eb381a3269 169
mbed_official 56:99eb381a3269 170 return length;
mbed_official 56:99eb381a3269 171 }
mbed_official 56:99eb381a3269 172
mbed_official 56:99eb381a3269 173 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 56:99eb381a3269 174 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 175 int timeout;
mbed_official 56:99eb381a3269 176 int count;
mbed_official 56:99eb381a3269 177
mbed_official 56:99eb381a3269 178 if (length == 0) return 0;
mbed_official 56:99eb381a3269 179
mbed_official 56:99eb381a3269 180 /*
mbed_official 56:99eb381a3269 181 // Wait until the bus is not busy anymore
mbed_official 56:99eb381a3269 182 timeout = LONG_TIMEOUT;
mbed_official 56:99eb381a3269 183 while (I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY) == SET) {
mbed_official 56:99eb381a3269 184 if ((timeout--) == 0) {
mbed_official 56:99eb381a3269 185 return EXIT_TIMEOUT;
mbed_official 56:99eb381a3269 186 }
mbed_official 56:99eb381a3269 187 }
mbed_official 56:99eb381a3269 188 */
mbed_official 56:99eb381a3269 189
mbed_official 56:99eb381a3269 190 i2c_start(obj);
mbed_official 56:99eb381a3269 191
mbed_official 56:99eb381a3269 192 // Send slave address for write
mbed_official 56:99eb381a3269 193 I2C_Send7bitAddress(i2c, address, I2C_Direction_Transmitter);
mbed_official 56:99eb381a3269 194
mbed_official 56:99eb381a3269 195 // Wait address is acknowledged
mbed_official 56:99eb381a3269 196 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 197 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) == ERROR) {
mbed_official 56:99eb381a3269 198 if ((timeout--) == 0) {
mbed_official 56:99eb381a3269 199 return EXIT_TIMEOUT;
mbed_official 56:99eb381a3269 200 }
mbed_official 56:99eb381a3269 201 }
mbed_official 56:99eb381a3269 202
mbed_official 56:99eb381a3269 203 for (count = 0; count < length; count++) {
mbed_official 56:99eb381a3269 204 if (i2c_byte_write(obj, data[count]) != EXIT_OK) {
mbed_official 56:99eb381a3269 205 return EXIT_FAIL;
mbed_official 56:99eb381a3269 206 }
mbed_official 56:99eb381a3269 207 }
mbed_official 56:99eb381a3269 208
mbed_official 56:99eb381a3269 209 // If not repeated start, send stop.
mbed_official 56:99eb381a3269 210 if (stop) {
mbed_official 56:99eb381a3269 211 i2c_stop(obj);
mbed_official 56:99eb381a3269 212 }
mbed_official 56:99eb381a3269 213
mbed_official 56:99eb381a3269 214 return count;
mbed_official 56:99eb381a3269 215 }
mbed_official 56:99eb381a3269 216
mbed_official 56:99eb381a3269 217 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 56:99eb381a3269 218 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 219 uint8_t data;
mbed_official 56:99eb381a3269 220 int timeout;
mbed_official 56:99eb381a3269 221
mbed_official 56:99eb381a3269 222 if (last) {
mbed_official 56:99eb381a3269 223 // Don't acknowledge the last byte
mbed_official 56:99eb381a3269 224 I2C_AcknowledgeConfig(i2c, DISABLE);
mbed_official 56:99eb381a3269 225 } else {
mbed_official 56:99eb381a3269 226 // Acknowledge the byte
mbed_official 56:99eb381a3269 227 I2C_AcknowledgeConfig(i2c, ENABLE);
mbed_official 56:99eb381a3269 228 }
mbed_official 56:99eb381a3269 229
mbed_official 56:99eb381a3269 230 // Wait until the byte is received
mbed_official 56:99eb381a3269 231 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 232 while (I2C_GetFlagStatus(i2c, I2C_FLAG_RXNE) == RESET) {
mbed_official 56:99eb381a3269 233 if ((timeout--) == 0) {
mbed_official 56:99eb381a3269 234 return EXIT_TIMEOUT;
mbed_official 56:99eb381a3269 235 }
mbed_official 56:99eb381a3269 236 }
mbed_official 56:99eb381a3269 237
mbed_official 56:99eb381a3269 238 data = I2C_ReceiveData(i2c);
mbed_official 56:99eb381a3269 239
mbed_official 56:99eb381a3269 240 return (int)data;
mbed_official 56:99eb381a3269 241 }
mbed_official 56:99eb381a3269 242
mbed_official 56:99eb381a3269 243 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 56:99eb381a3269 244 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 245 int timeout;
mbed_official 56:99eb381a3269 246
mbed_official 56:99eb381a3269 247 I2C_SendData(i2c, (uint8_t)data);
mbed_official 56:99eb381a3269 248
mbed_official 56:99eb381a3269 249 // Wait until the byte is transmitted
mbed_official 56:99eb381a3269 250 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 251 //while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_BYTE_TRANSMITTED) == ERROR) {
mbed_official 56:99eb381a3269 252 while ((I2C_GetFlagStatus(i2c, I2C_FLAG_TXE) == RESET) &&
mbed_official 56:99eb381a3269 253 (I2C_GetFlagStatus(i2c, I2C_FLAG_BTF) == RESET)) {
mbed_official 56:99eb381a3269 254 if ((timeout--) == 0) {
mbed_official 56:99eb381a3269 255 return EXIT_TIMEOUT;
mbed_official 56:99eb381a3269 256 }
mbed_official 56:99eb381a3269 257 }
mbed_official 56:99eb381a3269 258
mbed_official 56:99eb381a3269 259 return EXIT_OK;
mbed_official 56:99eb381a3269 260 }
mbed_official 56:99eb381a3269 261
mbed_official 56:99eb381a3269 262 void i2c_reset(i2c_t *obj) {
mbed_official 56:99eb381a3269 263 if (obj->i2c == I2C_1) {
mbed_official 56:99eb381a3269 264 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 56:99eb381a3269 265 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 56:99eb381a3269 266 }
mbed_official 56:99eb381a3269 267 if (obj->i2c == I2C_2) {
mbed_official 56:99eb381a3269 268 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 56:99eb381a3269 269 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 56:99eb381a3269 270 }
mbed_official 56:99eb381a3269 271 }
mbed_official 56:99eb381a3269 272
mbed_official 56:99eb381a3269 273 #if DEVICE_I2CSLAVE
mbed_official 56:99eb381a3269 274
mbed_official 56:99eb381a3269 275 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 56:99eb381a3269 276 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 277 uint16_t tmpreg;
mbed_official 56:99eb381a3269 278
mbed_official 56:99eb381a3269 279 // Get the old register value
mbed_official 56:99eb381a3269 280 tmpreg = i2c->OAR1;
mbed_official 56:99eb381a3269 281 // Reset address bits
mbed_official 56:99eb381a3269 282 tmpreg &= 0xFC00;
mbed_official 56:99eb381a3269 283 // Set new address
mbed_official 56:99eb381a3269 284 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 56:99eb381a3269 285 // Store the new register value
mbed_official 56:99eb381a3269 286 i2c->OAR1 = tmpreg;
mbed_official 56:99eb381a3269 287 }
mbed_official 56:99eb381a3269 288
mbed_official 56:99eb381a3269 289 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 56:99eb381a3269 290 // Nothing to do
mbed_official 56:99eb381a3269 291 }
mbed_official 56:99eb381a3269 292
mbed_official 56:99eb381a3269 293 #define NoData 0
mbed_official 56:99eb381a3269 294 #define ReadAddressed 1
mbed_official 56:99eb381a3269 295 #define WriteGeneral 2
mbed_official 56:99eb381a3269 296 #define WriteAddressed 3
mbed_official 56:99eb381a3269 297
mbed_official 56:99eb381a3269 298 int i2c_slave_receive(i2c_t *obj) {
mbed_official 56:99eb381a3269 299 //I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 300 int retval = NoData;
mbed_official 56:99eb381a3269 301 //int status;
mbed_official 56:99eb381a3269 302
mbed_official 56:99eb381a3269 303 //if (I2C_GetFlagStatus(i2c, I2C_FLAG_GENCALL) == SET) retval = WriteGeneral;
mbed_official 56:99eb381a3269 304
mbed_official 56:99eb381a3269 305 //status = I2C_GetLastEvent(i2c);
mbed_official 56:99eb381a3269 306
mbed_official 56:99eb381a3269 307 return(retval);
mbed_official 56:99eb381a3269 308 }
mbed_official 56:99eb381a3269 309
mbed_official 56:99eb381a3269 310 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 56:99eb381a3269 311 return 0;
mbed_official 56:99eb381a3269 312 }
mbed_official 56:99eb381a3269 313
mbed_official 56:99eb381a3269 314 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 56:99eb381a3269 315 return 0;
mbed_official 56:99eb381a3269 316 }
mbed_official 56:99eb381a3269 317
mbed_official 56:99eb381a3269 318
mbed_official 56:99eb381a3269 319 #endif // DEVICE_I2CSLAVE
mbed_official 56:99eb381a3269 320
mbed_official 56:99eb381a3269 321 #endif // DEVICE_I2C