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_DISCO_F100RB/i2c_api.c@126:549ba18ddd81, 2014-03-19 (annotated)

Committer:
mbed_official
Date:
Wed Mar 19 16:00:09 2014 +0000
Revision:
126:549ba18ddd81
Child:
227:7bd0639b8911
Synchronized with git revision cf8fd1cf86b0cd85131dd24a6ded21cc6fe04827



Full URL: https://github.com/mbedmicro/mbed/commit/cf8fd1cf86b0cd85131dd24a6ded21cc6fe04827/



Conflicts:

	workspace_tools/targets.py

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 126:549ba18ddd81 1 /* mbed Microcontroller Library
mbed_official 126:549ba18ddd81 2 *******************************************************************************
mbed_official 126:549ba18ddd81 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 126:549ba18ddd81 4 * All rights reserved.
mbed_official 126:549ba18ddd81 5 *
mbed_official 126:549ba18ddd81 6 * Redistribution and use in source and binary forms, with or without
mbed_official 126:549ba18ddd81 7 * modification, are permitted provided that the following conditions are met:
mbed_official 126:549ba18ddd81 8 *
mbed_official 126:549ba18ddd81 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 126:549ba18ddd81 10 * this list of conditions and the following disclaimer.
mbed_official 126:549ba18ddd81 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 126:549ba18ddd81 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 126:549ba18ddd81 13 * and/or other materials provided with the distribution.
mbed_official 126:549ba18ddd81 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 126:549ba18ddd81 15 * may be used to endorse or promote products derived from this software
mbed_official 126:549ba18ddd81 16 * without specific prior written permission.
mbed_official 126:549ba18ddd81 17 *
mbed_official 126:549ba18ddd81 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 126:549ba18ddd81 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 126:549ba18ddd81 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 126:549ba18ddd81 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 126:549ba18ddd81 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 126:549ba18ddd81 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 126:549ba18ddd81 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 126:549ba18ddd81 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 126:549ba18ddd81 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 126:549ba18ddd81 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 126:549ba18ddd81 28 *******************************************************************************
mbed_official 126:549ba18ddd81 29 */
mbed_official 126:549ba18ddd81 30 #include "i2c_api.h"
mbed_official 126:549ba18ddd81 31
mbed_official 126:549ba18ddd81 32 #if DEVICE_I2C
mbed_official 126:549ba18ddd81 33
mbed_official 126:549ba18ddd81 34 #include "cmsis.h"
mbed_official 126:549ba18ddd81 35 #include "pinmap.h"
mbed_official 126:549ba18ddd81 36 #include "error.h"
mbed_official 126:549ba18ddd81 37
mbed_official 126:549ba18ddd81 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 126:549ba18ddd81 39 not based on accurate values, they just guarantee that the application will
mbed_official 126:549ba18ddd81 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 126:549ba18ddd81 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 126:549ba18ddd81 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 126:549ba18ddd81 43
mbed_official 126:549ba18ddd81 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 126:549ba18ddd81 45 {PB_9, I2C_1, STM_PIN_DATA(GPIO_Mode_AF_OD, 8)}, // GPIO_Remap_I2C1
mbed_official 126:549ba18ddd81 46 {NC, NC, 0}
mbed_official 126:549ba18ddd81 47 };
mbed_official 126:549ba18ddd81 48
mbed_official 126:549ba18ddd81 49 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 126:549ba18ddd81 50 {PB_8, I2C_1, STM_PIN_DATA(GPIO_Mode_AF_OD, 8)}, // GPIO_Remap_I2C1
mbed_official 126:549ba18ddd81 51 {NC, NC, 0}
mbed_official 126:549ba18ddd81 52 };
mbed_official 126:549ba18ddd81 53
mbed_official 126:549ba18ddd81 54 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 126:549ba18ddd81 55 // Determine the I2C to use
mbed_official 126:549ba18ddd81 56 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 126:549ba18ddd81 57 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 126:549ba18ddd81 58
mbed_official 126:549ba18ddd81 59 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 126:549ba18ddd81 60
mbed_official 126:549ba18ddd81 61 if (obj->i2c == (I2CName)NC) {
mbed_official 126:549ba18ddd81 62 error("I2C pin mapping failed");
mbed_official 126:549ba18ddd81 63 }
mbed_official 126:549ba18ddd81 64
mbed_official 126:549ba18ddd81 65 // Enable I2C clock
mbed_official 126:549ba18ddd81 66 if (obj->i2c == I2C_1) {
mbed_official 126:549ba18ddd81 67 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 126:549ba18ddd81 68 }
mbed_official 126:549ba18ddd81 69 if (obj->i2c == I2C_2) {
mbed_official 126:549ba18ddd81 70 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 126:549ba18ddd81 71 }
mbed_official 126:549ba18ddd81 72
mbed_official 126:549ba18ddd81 73 // Configure I2C pins
mbed_official 126:549ba18ddd81 74 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 126:549ba18ddd81 75 pin_mode(scl, OpenDrain);
mbed_official 126:549ba18ddd81 76 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 126:549ba18ddd81 77 pin_mode(sda, OpenDrain);
mbed_official 126:549ba18ddd81 78
mbed_official 126:549ba18ddd81 79 // Reset to clear pending flags if any
mbed_official 126:549ba18ddd81 80 i2c_reset(obj);
mbed_official 126:549ba18ddd81 81
mbed_official 126:549ba18ddd81 82 // I2C configuration
mbed_official 126:549ba18ddd81 83 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 126:549ba18ddd81 84 }
mbed_official 126:549ba18ddd81 85
mbed_official 126:549ba18ddd81 86 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 126:549ba18ddd81 87 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 88 I2C_InitTypeDef I2C_InitStructure;
mbed_official 126:549ba18ddd81 89
mbed_official 126:549ba18ddd81 90 if ((hz != 0) && (hz <= 400000)) {
mbed_official 126:549ba18ddd81 91 I2C_DeInit(i2c);
mbed_official 126:549ba18ddd81 92
mbed_official 126:549ba18ddd81 93 // I2C configuration
mbed_official 126:549ba18ddd81 94 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 126:549ba18ddd81 95 I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
mbed_official 126:549ba18ddd81 96 I2C_InitStructure.I2C_OwnAddress1 = 0;
mbed_official 126:549ba18ddd81 97 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 126:549ba18ddd81 98 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 126:549ba18ddd81 99 I2C_InitStructure.I2C_ClockSpeed = hz;
mbed_official 126:549ba18ddd81 100 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 126:549ba18ddd81 101
mbed_official 126:549ba18ddd81 102 I2C_Cmd(i2c, ENABLE);
mbed_official 126:549ba18ddd81 103 }
mbed_official 126:549ba18ddd81 104 }
mbed_official 126:549ba18ddd81 105
mbed_official 126:549ba18ddd81 106 inline int i2c_start(i2c_t *obj) {
mbed_official 126:549ba18ddd81 107 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 108 int timeout;
mbed_official 126:549ba18ddd81 109
mbed_official 126:549ba18ddd81 110 I2C_ClearFlag(i2c, I2C_FLAG_AF); // Clear Acknowledge failure flag
mbed_official 126:549ba18ddd81 111
mbed_official 126:549ba18ddd81 112 // Generate the START condition
mbed_official 126:549ba18ddd81 113 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 126:549ba18ddd81 114
mbed_official 126:549ba18ddd81 115 // Wait the START condition has been correctly sent
mbed_official 126:549ba18ddd81 116 timeout = FLAG_TIMEOUT;
mbed_official 126:549ba18ddd81 117 //while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_MODE_SELECT) == ERROR) {
mbed_official 126:549ba18ddd81 118 while (I2C_GetFlagStatus(i2c, I2C_FLAG_SB) == RESET) {
mbed_official 126:549ba18ddd81 119 timeout--;
mbed_official 126:549ba18ddd81 120 if (timeout == 0) {
mbed_official 126:549ba18ddd81 121 return 1;
mbed_official 126:549ba18ddd81 122 }
mbed_official 126:549ba18ddd81 123 }
mbed_official 126:549ba18ddd81 124
mbed_official 126:549ba18ddd81 125 return 0;
mbed_official 126:549ba18ddd81 126 }
mbed_official 126:549ba18ddd81 127
mbed_official 126:549ba18ddd81 128 inline int i2c_stop(i2c_t *obj) {
mbed_official 126:549ba18ddd81 129 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 130
mbed_official 126:549ba18ddd81 131 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 126:549ba18ddd81 132
mbed_official 126:549ba18ddd81 133 return 0;
mbed_official 126:549ba18ddd81 134 }
mbed_official 126:549ba18ddd81 135
mbed_official 126:549ba18ddd81 136 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 126:549ba18ddd81 137 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 138 int timeout;
mbed_official 126:549ba18ddd81 139 int count;
mbed_official 126:549ba18ddd81 140 int value;
mbed_official 126:549ba18ddd81 141
mbed_official 126:549ba18ddd81 142 if (length == 0) return 0;
mbed_official 126:549ba18ddd81 143
mbed_official 126:549ba18ddd81 144 /*
mbed_official 126:549ba18ddd81 145 // Wait until the bus is not busy anymore
mbed_official 126:549ba18ddd81 146 timeout = LONG_TIMEOUT;
mbed_official 126:549ba18ddd81 147 while (I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY) == SET) {
mbed_official 126:549ba18ddd81 148 timeout--;
mbed_official 126:549ba18ddd81 149 if (timeout == 0) {
mbed_official 126:549ba18ddd81 150 return 0;
mbed_official 126:549ba18ddd81 151 }
mbed_official 126:549ba18ddd81 152 }
mbed_official 126:549ba18ddd81 153 */
mbed_official 126:549ba18ddd81 154
mbed_official 126:549ba18ddd81 155 i2c_start(obj);
mbed_official 126:549ba18ddd81 156
mbed_official 126:549ba18ddd81 157 // Send slave address for read
mbed_official 126:549ba18ddd81 158 I2C_Send7bitAddress(i2c, address, I2C_Direction_Receiver);
mbed_official 126:549ba18ddd81 159
mbed_official 126:549ba18ddd81 160 // Wait address is acknowledged
mbed_official 126:549ba18ddd81 161 timeout = FLAG_TIMEOUT;
mbed_official 126:549ba18ddd81 162 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) == ERROR) {
mbed_official 126:549ba18ddd81 163 timeout--;
mbed_official 126:549ba18ddd81 164 if (timeout == 0) {
mbed_official 126:549ba18ddd81 165 return 0;
mbed_official 126:549ba18ddd81 166 }
mbed_official 126:549ba18ddd81 167 }
mbed_official 126:549ba18ddd81 168
mbed_official 126:549ba18ddd81 169 // Read all bytes except last one
mbed_official 126:549ba18ddd81 170 for (count = 0; count < (length - 1); count++) {
mbed_official 126:549ba18ddd81 171 value = i2c_byte_read(obj, 0);
mbed_official 126:549ba18ddd81 172 data[count] = (char)value;
mbed_official 126:549ba18ddd81 173 }
mbed_official 126:549ba18ddd81 174
mbed_official 126:549ba18ddd81 175 // If not repeated start, send stop.
mbed_official 126:549ba18ddd81 176 // Warning: must be done BEFORE the data is read.
mbed_official 126:549ba18ddd81 177 if (stop) {
mbed_official 126:549ba18ddd81 178 i2c_stop(obj);
mbed_official 126:549ba18ddd81 179 }
mbed_official 126:549ba18ddd81 180
mbed_official 126:549ba18ddd81 181 // Read the last byte
mbed_official 126:549ba18ddd81 182 value = i2c_byte_read(obj, 1);
mbed_official 126:549ba18ddd81 183 data[count] = (char)value;
mbed_official 126:549ba18ddd81 184
mbed_official 126:549ba18ddd81 185 return length;
mbed_official 126:549ba18ddd81 186 }
mbed_official 126:549ba18ddd81 187
mbed_official 126:549ba18ddd81 188 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 126:549ba18ddd81 189 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 190 int timeout;
mbed_official 126:549ba18ddd81 191 int count;
mbed_official 126:549ba18ddd81 192
mbed_official 126:549ba18ddd81 193 /*
mbed_official 126:549ba18ddd81 194 // Wait until the bus is not busy anymore
mbed_official 126:549ba18ddd81 195 timeout = LONG_TIMEOUT;
mbed_official 126:549ba18ddd81 196 while (I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY) == SET) {
mbed_official 126:549ba18ddd81 197 timeout--;
mbed_official 126:549ba18ddd81 198 if (timeout == 0) {
mbed_official 126:549ba18ddd81 199 return 0;
mbed_official 126:549ba18ddd81 200 }
mbed_official 126:549ba18ddd81 201 }
mbed_official 126:549ba18ddd81 202 */
mbed_official 126:549ba18ddd81 203
mbed_official 126:549ba18ddd81 204 i2c_start(obj);
mbed_official 126:549ba18ddd81 205
mbed_official 126:549ba18ddd81 206 // Send slave address for write
mbed_official 126:549ba18ddd81 207 I2C_Send7bitAddress(i2c, address, I2C_Direction_Transmitter);
mbed_official 126:549ba18ddd81 208
mbed_official 126:549ba18ddd81 209 // Wait address is acknowledged
mbed_official 126:549ba18ddd81 210 timeout = FLAG_TIMEOUT;
mbed_official 126:549ba18ddd81 211 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) == ERROR) {
mbed_official 126:549ba18ddd81 212 timeout--;
mbed_official 126:549ba18ddd81 213 if (timeout == 0) {
mbed_official 126:549ba18ddd81 214 return 0;
mbed_official 126:549ba18ddd81 215 }
mbed_official 126:549ba18ddd81 216 }
mbed_official 126:549ba18ddd81 217
mbed_official 126:549ba18ddd81 218 for (count = 0; count < length; count++) {
mbed_official 126:549ba18ddd81 219 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 126:549ba18ddd81 220 i2c_stop(obj);
mbed_official 126:549ba18ddd81 221 return 0;
mbed_official 126:549ba18ddd81 222 }
mbed_official 126:549ba18ddd81 223 }
mbed_official 126:549ba18ddd81 224
mbed_official 126:549ba18ddd81 225 // If not repeated start, send stop.
mbed_official 126:549ba18ddd81 226 if (stop) {
mbed_official 126:549ba18ddd81 227 i2c_stop(obj);
mbed_official 126:549ba18ddd81 228 }
mbed_official 126:549ba18ddd81 229
mbed_official 126:549ba18ddd81 230 return count;
mbed_official 126:549ba18ddd81 231 }
mbed_official 126:549ba18ddd81 232
mbed_official 126:549ba18ddd81 233 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 126:549ba18ddd81 234 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 235 uint8_t data;
mbed_official 126:549ba18ddd81 236 int timeout;
mbed_official 126:549ba18ddd81 237
mbed_official 126:549ba18ddd81 238 if (last) {
mbed_official 126:549ba18ddd81 239 // Don't acknowledge the last byte
mbed_official 126:549ba18ddd81 240 I2C_AcknowledgeConfig(i2c, DISABLE);
mbed_official 126:549ba18ddd81 241 } else {
mbed_official 126:549ba18ddd81 242 // Acknowledge the byte
mbed_official 126:549ba18ddd81 243 I2C_AcknowledgeConfig(i2c, ENABLE);
mbed_official 126:549ba18ddd81 244 }
mbed_official 126:549ba18ddd81 245
mbed_official 126:549ba18ddd81 246 // Wait until the byte is received
mbed_official 126:549ba18ddd81 247 timeout = FLAG_TIMEOUT;
mbed_official 126:549ba18ddd81 248 while (I2C_GetFlagStatus(i2c, I2C_FLAG_RXNE) == RESET) {
mbed_official 126:549ba18ddd81 249 timeout--;
mbed_official 126:549ba18ddd81 250 if (timeout == 0) {
mbed_official 126:549ba18ddd81 251 return 0;
mbed_official 126:549ba18ddd81 252 }
mbed_official 126:549ba18ddd81 253 }
mbed_official 126:549ba18ddd81 254
mbed_official 126:549ba18ddd81 255 data = I2C_ReceiveData(i2c);
mbed_official 126:549ba18ddd81 256
mbed_official 126:549ba18ddd81 257 return (int)data;
mbed_official 126:549ba18ddd81 258 }
mbed_official 126:549ba18ddd81 259
mbed_official 126:549ba18ddd81 260 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 126:549ba18ddd81 261 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 262 int timeout;
mbed_official 126:549ba18ddd81 263
mbed_official 126:549ba18ddd81 264 I2C_SendData(i2c, (uint8_t)data);
mbed_official 126:549ba18ddd81 265
mbed_official 126:549ba18ddd81 266 // Wait until the byte is transmitted
mbed_official 126:549ba18ddd81 267 timeout = FLAG_TIMEOUT;
mbed_official 126:549ba18ddd81 268 //while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_BYTE_TRANSMITTED) == ERROR) {
mbed_official 126:549ba18ddd81 269 while ((I2C_GetFlagStatus(i2c, I2C_FLAG_TXE) == RESET) &&
mbed_official 126:549ba18ddd81 270 (I2C_GetFlagStatus(i2c, I2C_FLAG_BTF) == RESET)) {
mbed_official 126:549ba18ddd81 271 timeout--;
mbed_official 126:549ba18ddd81 272 if (timeout == 0) {
mbed_official 126:549ba18ddd81 273 return 0;
mbed_official 126:549ba18ddd81 274 }
mbed_official 126:549ba18ddd81 275 }
mbed_official 126:549ba18ddd81 276
mbed_official 126:549ba18ddd81 277 return 1;
mbed_official 126:549ba18ddd81 278 }
mbed_official 126:549ba18ddd81 279
mbed_official 126:549ba18ddd81 280 void i2c_reset(i2c_t *obj) {
mbed_official 126:549ba18ddd81 281 if (obj->i2c == I2C_1) {
mbed_official 126:549ba18ddd81 282 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 126:549ba18ddd81 283 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 126:549ba18ddd81 284 }
mbed_official 126:549ba18ddd81 285 if (obj->i2c == I2C_2) {
mbed_official 126:549ba18ddd81 286 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 126:549ba18ddd81 287 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 126:549ba18ddd81 288 }
mbed_official 126:549ba18ddd81 289 }
mbed_official 126:549ba18ddd81 290
mbed_official 126:549ba18ddd81 291 #if DEVICE_I2CSLAVE
mbed_official 126:549ba18ddd81 292
mbed_official 126:549ba18ddd81 293 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 126:549ba18ddd81 294 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 295 uint16_t tmpreg;
mbed_official 126:549ba18ddd81 296
mbed_official 126:549ba18ddd81 297 // Get the old register value
mbed_official 126:549ba18ddd81 298 tmpreg = i2c->OAR1;
mbed_official 126:549ba18ddd81 299 // Reset address bits
mbed_official 126:549ba18ddd81 300 tmpreg &= 0xFC00;
mbed_official 126:549ba18ddd81 301 // Set new address
mbed_official 126:549ba18ddd81 302 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 126:549ba18ddd81 303 // Store the new register value
mbed_official 126:549ba18ddd81 304 i2c->OAR1 = tmpreg;
mbed_official 126:549ba18ddd81 305 }
mbed_official 126:549ba18ddd81 306
mbed_official 126:549ba18ddd81 307 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 126:549ba18ddd81 308 // Nothing to do
mbed_official 126:549ba18ddd81 309 }
mbed_official 126:549ba18ddd81 310
mbed_official 126:549ba18ddd81 311 // See I2CSlave.h
mbed_official 126:549ba18ddd81 312 #define NoData 0 // the slave has not been addressed
mbed_official 126:549ba18ddd81 313 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 126:549ba18ddd81 314 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 126:549ba18ddd81 315 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 126:549ba18ddd81 316
mbed_official 126:549ba18ddd81 317 int i2c_slave_receive(i2c_t *obj) {
mbed_official 126:549ba18ddd81 318 // TO BE DONE
mbed_official 126:549ba18ddd81 319 return(0);
mbed_official 126:549ba18ddd81 320 }
mbed_official 126:549ba18ddd81 321
mbed_official 126:549ba18ddd81 322 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 126:549ba18ddd81 323 int count = 0;
mbed_official 126:549ba18ddd81 324
mbed_official 126:549ba18ddd81 325 // Read all bytes
mbed_official 126:549ba18ddd81 326 for (count = 0; count < length; count++) {
mbed_official 126:549ba18ddd81 327 data[count] = i2c_byte_read(obj, 0);
mbed_official 126:549ba18ddd81 328 }
mbed_official 126:549ba18ddd81 329
mbed_official 126:549ba18ddd81 330 return count;
mbed_official 126:549ba18ddd81 331 }
mbed_official 126:549ba18ddd81 332
mbed_official 126:549ba18ddd81 333 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 126:549ba18ddd81 334 int count = 0;
mbed_official 126:549ba18ddd81 335
mbed_official 126:549ba18ddd81 336 // Write all bytes
mbed_official 126:549ba18ddd81 337 for (count = 0; count < length; count++) {
mbed_official 126:549ba18ddd81 338 i2c_byte_write(obj, data[count]);
mbed_official 126:549ba18ddd81 339 }
mbed_official 126:549ba18ddd81 340
mbed_official 126:549ba18ddd81 341 return count;
mbed_official 126:549ba18ddd81 342 }
mbed_official 126:549ba18ddd81 343
mbed_official 126:549ba18ddd81 344
mbed_official 126:549ba18ddd81 345 #endif // DEVICE_I2CSLAVE
mbed_official 126:549ba18ddd81 346
mbed_official 126:549ba18ddd81 347 #endif // DEVICE_I2C