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@167:d5744491c362, 2014-04-23 (annotated)

Committer:
mbed_official
Date:
Wed Apr 23 11:00:08 2014 +0100
Revision:
167:d5744491c362
Parent:
80:66393a7b209d
Child:
174:8bb9f3a33240
Synchronized with git revision 6cf73e2e267b625c71cbf586a1d74e7e4972a369



Full URL: https://github.com/mbedmicro/mbed/commit/6cf73e2e267b625c71cbf586a1d74e7e4972a369/



[NUCLEO_F030R8/F302R8] Move back SetSysClock() call in SystemInit()

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 56:99eb381a3269 39 not based on accurate values, they just guarantee that the application will
mbed_official 56:99eb381a3269 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 56:99eb381a3269 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 56:99eb381a3269 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 56:99eb381a3269 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 56:99eb381a3269 82
mbed_official 56:99eb381a3269 83 // Reset to clear pending flags if any
mbed_official 56:99eb381a3269 84 i2c_reset(obj);
mbed_official 56:99eb381a3269 85
mbed_official 56:99eb381a3269 86 // I2C configuration
mbed_official 56:99eb381a3269 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 56:99eb381a3269 93
mbed_official 56:99eb381a3269 94 if ((hz != 0) && (hz <= 400000)) {
mbed_official 80:66393a7b209d 95 I2C_DeInit(i2c);
mbed_official 80:66393a7b209d 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 80:66393a7b209d 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 56:99eb381a3269 113
mbed_official 56:99eb381a3269 114 I2C_ClearFlag(i2c, I2C_FLAG_AF); // Clear Acknowledge failure flag
mbed_official 56:99eb381a3269 115
mbed_official 56:99eb381a3269 116 // Generate the START condition
mbed_official 56:99eb381a3269 117 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 56:99eb381a3269 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_CheckEvent(i2c, I2C_EVENT_MASTER_MODE_SELECT) == ERROR) {
mbed_official 56:99eb381a3269 122 while (I2C_GetFlagStatus(i2c, I2C_FLAG_SB) == RESET) {
mbed_official 80:66393a7b209d 123 timeout--;
mbed_official 80:66393a7b209d 124 if (timeout == 0) {
mbed_official 80:66393a7b209d 125 return 1;
mbed_official 80:66393a7b209d 126 }
mbed_official 56:99eb381a3269 127 }
mbed_official 56:99eb381a3269 128
mbed_official 58:3b55b7a41411 129 return 0;
mbed_official 56:99eb381a3269 130 }
mbed_official 56:99eb381a3269 131
mbed_official 56:99eb381a3269 132 inline int i2c_stop(i2c_t *obj) {
mbed_official 56:99eb381a3269 133 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 58:3b55b7a41411 134
mbed_official 56:99eb381a3269 135 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 58:3b55b7a41411 136
mbed_official 58:3b55b7a41411 137 return 0;
mbed_official 56:99eb381a3269 138 }
mbed_official 56:99eb381a3269 139
mbed_official 56:99eb381a3269 140 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 56:99eb381a3269 141 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 142 int timeout;
mbed_official 56:99eb381a3269 143 int count;
mbed_official 56:99eb381a3269 144 int value;
mbed_official 56:99eb381a3269 145
mbed_official 56:99eb381a3269 146 if (length == 0) return 0;
mbed_official 56:99eb381a3269 147
mbed_official 56:99eb381a3269 148 /*
mbed_official 56:99eb381a3269 149 // Wait until the bus is not busy anymore
mbed_official 56:99eb381a3269 150 timeout = LONG_TIMEOUT;
mbed_official 56:99eb381a3269 151 while (I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY) == SET) {
mbed_official 80:66393a7b209d 152 timeout--;
mbed_official 80:66393a7b209d 153 if (timeout == 0) {
mbed_official 58:3b55b7a41411 154 return 0;
mbed_official 56:99eb381a3269 155 }
mbed_official 56:99eb381a3269 156 }
mbed_official 56:99eb381a3269 157 */
mbed_official 56:99eb381a3269 158
mbed_official 56:99eb381a3269 159 i2c_start(obj);
mbed_official 56:99eb381a3269 160
mbed_official 56:99eb381a3269 161 // Send slave address for read
mbed_official 56:99eb381a3269 162 I2C_Send7bitAddress(i2c, address, I2C_Direction_Receiver);
mbed_official 56:99eb381a3269 163
mbed_official 56:99eb381a3269 164 // Wait address is acknowledged
mbed_official 56:99eb381a3269 165 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 166 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) == ERROR) {
mbed_official 80:66393a7b209d 167 timeout--;
mbed_official 80:66393a7b209d 168 if (timeout == 0) {
mbed_official 80:66393a7b209d 169 return 0;
mbed_official 80:66393a7b209d 170 }
mbed_official 56:99eb381a3269 171 }
mbed_official 56:99eb381a3269 172
mbed_official 56:99eb381a3269 173 // Read all bytes except last one
mbed_official 56:99eb381a3269 174 for (count = 0; count < (length - 1); count++) {
mbed_official 56:99eb381a3269 175 value = i2c_byte_read(obj, 0);
mbed_official 56:99eb381a3269 176 data[count] = (char)value;
mbed_official 56:99eb381a3269 177 }
mbed_official 56:99eb381a3269 178
mbed_official 56:99eb381a3269 179 // If not repeated start, send stop.
mbed_official 56:99eb381a3269 180 // Warning: must be done BEFORE the data is read.
mbed_official 56:99eb381a3269 181 if (stop) {
mbed_official 56:99eb381a3269 182 i2c_stop(obj);
mbed_official 56:99eb381a3269 183 }
mbed_official 56:99eb381a3269 184
mbed_official 56:99eb381a3269 185 // Read the last byte
mbed_official 56:99eb381a3269 186 value = i2c_byte_read(obj, 1);
mbed_official 56:99eb381a3269 187 data[count] = (char)value;
mbed_official 56:99eb381a3269 188
mbed_official 56:99eb381a3269 189 return length;
mbed_official 56:99eb381a3269 190 }
mbed_official 56:99eb381a3269 191
mbed_official 56:99eb381a3269 192 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 56:99eb381a3269 193 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 194 int timeout;
mbed_official 56:99eb381a3269 195 int count;
mbed_official 56:99eb381a3269 196
mbed_official 56:99eb381a3269 197 /*
mbed_official 56:99eb381a3269 198 // Wait until the bus is not busy anymore
mbed_official 56:99eb381a3269 199 timeout = LONG_TIMEOUT;
mbed_official 56:99eb381a3269 200 while (I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY) == SET) {
mbed_official 80:66393a7b209d 201 timeout--;
mbed_official 80:66393a7b209d 202 if (timeout == 0) {
mbed_official 58:3b55b7a41411 203 return 0;
mbed_official 56:99eb381a3269 204 }
mbed_official 56:99eb381a3269 205 }
mbed_official 56:99eb381a3269 206 */
mbed_official 56:99eb381a3269 207
mbed_official 56:99eb381a3269 208 i2c_start(obj);
mbed_official 56:99eb381a3269 209
mbed_official 56:99eb381a3269 210 // Send slave address for write
mbed_official 56:99eb381a3269 211 I2C_Send7bitAddress(i2c, address, I2C_Direction_Transmitter);
mbed_official 56:99eb381a3269 212
mbed_official 56:99eb381a3269 213 // Wait address is acknowledged
mbed_official 56:99eb381a3269 214 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 215 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) == ERROR) {
mbed_official 80:66393a7b209d 216 timeout--;
mbed_official 80:66393a7b209d 217 if (timeout == 0) {
mbed_official 80:66393a7b209d 218 return 0;
mbed_official 80:66393a7b209d 219 }
mbed_official 56:99eb381a3269 220 }
mbed_official 56:99eb381a3269 221
mbed_official 56:99eb381a3269 222 for (count = 0; count < length; count++) {
mbed_official 58:3b55b7a41411 223 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 58:3b55b7a41411 224 i2c_stop(obj);
mbed_official 58:3b55b7a41411 225 return 0;
mbed_official 56:99eb381a3269 226 }
mbed_official 56:99eb381a3269 227 }
mbed_official 56:99eb381a3269 228
mbed_official 56:99eb381a3269 229 // If not repeated start, send stop.
mbed_official 56:99eb381a3269 230 if (stop) {
mbed_official 56:99eb381a3269 231 i2c_stop(obj);
mbed_official 56:99eb381a3269 232 }
mbed_official 56:99eb381a3269 233
mbed_official 56:99eb381a3269 234 return count;
mbed_official 56:99eb381a3269 235 }
mbed_official 56:99eb381a3269 236
mbed_official 56:99eb381a3269 237 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 56:99eb381a3269 238 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 239 uint8_t data;
mbed_official 56:99eb381a3269 240 int timeout;
mbed_official 56:99eb381a3269 241
mbed_official 56:99eb381a3269 242 if (last) {
mbed_official 56:99eb381a3269 243 // Don't acknowledge the last byte
mbed_official 56:99eb381a3269 244 I2C_AcknowledgeConfig(i2c, DISABLE);
mbed_official 56:99eb381a3269 245 } else {
mbed_official 56:99eb381a3269 246 // Acknowledge the byte
mbed_official 56:99eb381a3269 247 I2C_AcknowledgeConfig(i2c, ENABLE);
mbed_official 56:99eb381a3269 248 }
mbed_official 56:99eb381a3269 249
mbed_official 56:99eb381a3269 250 // Wait until the byte is received
mbed_official 56:99eb381a3269 251 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 252 while (I2C_GetFlagStatus(i2c, I2C_FLAG_RXNE) == RESET) {
mbed_official 80:66393a7b209d 253 timeout--;
mbed_official 80:66393a7b209d 254 if (timeout == 0) {
mbed_official 80:66393a7b209d 255 return 0;
mbed_official 80:66393a7b209d 256 }
mbed_official 56:99eb381a3269 257 }
mbed_official 56:99eb381a3269 258
mbed_official 56:99eb381a3269 259 data = I2C_ReceiveData(i2c);
mbed_official 56:99eb381a3269 260
mbed_official 56:99eb381a3269 261 return (int)data;
mbed_official 56:99eb381a3269 262 }
mbed_official 56:99eb381a3269 263
mbed_official 56:99eb381a3269 264 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 56:99eb381a3269 265 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 266 int timeout;
mbed_official 56:99eb381a3269 267
mbed_official 56:99eb381a3269 268 I2C_SendData(i2c, (uint8_t)data);
mbed_official 56:99eb381a3269 269
mbed_official 56:99eb381a3269 270 // Wait until the byte is transmitted
mbed_official 56:99eb381a3269 271 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 272 //while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_BYTE_TRANSMITTED) == ERROR) {
mbed_official 56:99eb381a3269 273 while ((I2C_GetFlagStatus(i2c, I2C_FLAG_TXE) == RESET) &&
mbed_official 56:99eb381a3269 274 (I2C_GetFlagStatus(i2c, I2C_FLAG_BTF) == RESET)) {
mbed_official 80:66393a7b209d 275 timeout--;
mbed_official 80:66393a7b209d 276 if (timeout == 0) {
mbed_official 58:3b55b7a41411 277 return 0;
mbed_official 56:99eb381a3269 278 }
mbed_official 56:99eb381a3269 279 }
mbed_official 56:99eb381a3269 280
mbed_official 58:3b55b7a41411 281 return 1;
mbed_official 56:99eb381a3269 282 }
mbed_official 56:99eb381a3269 283
mbed_official 56:99eb381a3269 284 void i2c_reset(i2c_t *obj) {
mbed_official 56:99eb381a3269 285 if (obj->i2c == I2C_1) {
mbed_official 56:99eb381a3269 286 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 56:99eb381a3269 287 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 56:99eb381a3269 288 }
mbed_official 56:99eb381a3269 289 if (obj->i2c == I2C_2) {
mbed_official 56:99eb381a3269 290 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 56:99eb381a3269 291 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 56:99eb381a3269 292 }
mbed_official 56:99eb381a3269 293 }
mbed_official 56:99eb381a3269 294
mbed_official 56:99eb381a3269 295 #if DEVICE_I2CSLAVE
mbed_official 56:99eb381a3269 296
mbed_official 56:99eb381a3269 297 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 56:99eb381a3269 298 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 299 uint16_t tmpreg;
mbed_official 56:99eb381a3269 300
mbed_official 56:99eb381a3269 301 // Get the old register value
mbed_official 56:99eb381a3269 302 tmpreg = i2c->OAR1;
mbed_official 56:99eb381a3269 303 // Reset address bits
mbed_official 56:99eb381a3269 304 tmpreg &= 0xFC00;
mbed_official 56:99eb381a3269 305 // Set new address
mbed_official 56:99eb381a3269 306 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 56:99eb381a3269 307 // Store the new register value
mbed_official 56:99eb381a3269 308 i2c->OAR1 = tmpreg;
mbed_official 56:99eb381a3269 309 }
mbed_official 56:99eb381a3269 310
mbed_official 56:99eb381a3269 311 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 56:99eb381a3269 312 // Nothing to do
mbed_official 56:99eb381a3269 313 }
mbed_official 56:99eb381a3269 314
mbed_official 58:3b55b7a41411 315 // See I2CSlave.h
mbed_official 58:3b55b7a41411 316 #define NoData 0 // the slave has not been addressed
mbed_official 58:3b55b7a41411 317 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 58:3b55b7a41411 318 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 58:3b55b7a41411 319 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 56:99eb381a3269 320
mbed_official 56:99eb381a3269 321 int i2c_slave_receive(i2c_t *obj) {
mbed_official 58:3b55b7a41411 322 // TO BE DONE
mbed_official 58:3b55b7a41411 323 return(0);
mbed_official 56:99eb381a3269 324 }
mbed_official 56:99eb381a3269 325
mbed_official 56:99eb381a3269 326 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 58:3b55b7a41411 327 int count = 0;
mbed_official 58:3b55b7a41411 328
mbed_official 58:3b55b7a41411 329 // Read all bytes
mbed_official 58:3b55b7a41411 330 for (count = 0; count < length; count++) {
mbed_official 58:3b55b7a41411 331 data[count] = i2c_byte_read(obj, 0);
mbed_official 58:3b55b7a41411 332 }
mbed_official 58:3b55b7a41411 333
mbed_official 58:3b55b7a41411 334 return count;
mbed_official 56:99eb381a3269 335 }
mbed_official 56:99eb381a3269 336
mbed_official 56:99eb381a3269 337 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 58:3b55b7a41411 338 int count = 0;
mbed_official 58:3b55b7a41411 339
mbed_official 58:3b55b7a41411 340 // Write all bytes
mbed_official 58:3b55b7a41411 341 for (count = 0; count < length; count++) {
mbed_official 58:3b55b7a41411 342 i2c_byte_write(obj, data[count]);
mbed_official 58:3b55b7a41411 343 }
mbed_official 58:3b55b7a41411 344
mbed_official 58:3b55b7a41411 345 return count;
mbed_official 56:99eb381a3269 346 }
mbed_official 56:99eb381a3269 347
mbed_official 56:99eb381a3269 348
mbed_official 56:99eb381a3269 349 #endif // DEVICE_I2CSLAVE
mbed_official 56:99eb381a3269 350
mbed_official 56:99eb381a3269 351 #endif // DEVICE_I2C