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@323:9e901b0a5aa1, 2014-09-13 (annotated)

Committer:
shaoziyang
Date:
Sat Sep 13 14:25:46 2014 +0000
Revision:
323:9e901b0a5aa1
Parent:
227:7bd0639b8911 
test with CLOCK_SETUP = 0

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 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 126:549ba18ddd81 31 #include "i2c_api.h"
mbed_official 126:549ba18ddd81 32
mbed_official 126:549ba18ddd81 33 #if DEVICE_I2C
mbed_official 126:549ba18ddd81 34
mbed_official 126:549ba18ddd81 35 #include "cmsis.h"
mbed_official 126:549ba18ddd81 36 #include "pinmap.h"
mbed_official 126:549ba18ddd81 37
mbed_official 126:549ba18ddd81 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 227:7bd0639b8911 39 not based on accurate values, they just guarantee that the application will
mbed_official 227:7bd0639b8911 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 227:7bd0639b8911 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 227:7bd0639b8911 60 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 126:549ba18ddd81 61
mbed_official 126:549ba18ddd81 62 // Enable I2C clock
mbed_official 227:7bd0639b8911 63 if (obj->i2c == I2C_1) {
mbed_official 126:549ba18ddd81 64 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 126:549ba18ddd81 65 }
mbed_official 126:549ba18ddd81 66 if (obj->i2c == I2C_2) {
mbed_official 126:549ba18ddd81 67 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 126:549ba18ddd81 68 }
mbed_official 126:549ba18ddd81 69
mbed_official 126:549ba18ddd81 70 // Configure I2C pins
mbed_official 126:549ba18ddd81 71 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 126:549ba18ddd81 72 pin_mode(scl, OpenDrain);
mbed_official 126:549ba18ddd81 73 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 126:549ba18ddd81 74 pin_mode(sda, OpenDrain);
mbed_official 126:549ba18ddd81 75
mbed_official 126:549ba18ddd81 76 // Reset to clear pending flags if any
mbed_official 126:549ba18ddd81 77 i2c_reset(obj);
mbed_official 126:549ba18ddd81 78
mbed_official 126:549ba18ddd81 79 // I2C configuration
mbed_official 227:7bd0639b8911 80 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 126:549ba18ddd81 81 }
mbed_official 126:549ba18ddd81 82
mbed_official 126:549ba18ddd81 83 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 126:549ba18ddd81 84 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 85 I2C_InitTypeDef I2C_InitStructure;
mbed_official 126:549ba18ddd81 86
mbed_official 126:549ba18ddd81 87 if ((hz != 0) && (hz <= 400000)) {
mbed_official 126:549ba18ddd81 88 I2C_DeInit(i2c);
mbed_official 126:549ba18ddd81 89
mbed_official 126:549ba18ddd81 90 // I2C configuration
mbed_official 126:549ba18ddd81 91 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 126:549ba18ddd81 92 I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
mbed_official 126:549ba18ddd81 93 I2C_InitStructure.I2C_OwnAddress1 = 0;
mbed_official 126:549ba18ddd81 94 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 126:549ba18ddd81 95 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 126:549ba18ddd81 96 I2C_InitStructure.I2C_ClockSpeed = hz;
mbed_official 126:549ba18ddd81 97 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 126:549ba18ddd81 98
mbed_official 126:549ba18ddd81 99 I2C_Cmd(i2c, ENABLE);
mbed_official 126:549ba18ddd81 100 }
mbed_official 126:549ba18ddd81 101 }
mbed_official 126:549ba18ddd81 102
mbed_official 126:549ba18ddd81 103 inline int i2c_start(i2c_t *obj) {
mbed_official 126:549ba18ddd81 104 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 105 int timeout;
mbed_official 126:549ba18ddd81 106
mbed_official 126:549ba18ddd81 107 I2C_ClearFlag(i2c, I2C_FLAG_AF); // Clear Acknowledge failure flag
mbed_official 126:549ba18ddd81 108
mbed_official 126:549ba18ddd81 109 // Generate the START condition
mbed_official 227:7bd0639b8911 110 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 126:549ba18ddd81 111
mbed_official 126:549ba18ddd81 112 // Wait the START condition has been correctly sent
mbed_official 126:549ba18ddd81 113 timeout = FLAG_TIMEOUT;
mbed_official 126:549ba18ddd81 114 //while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_MODE_SELECT) == ERROR) {
mbed_official 126:549ba18ddd81 115 while (I2C_GetFlagStatus(i2c, I2C_FLAG_SB) == RESET) {
mbed_official 126:549ba18ddd81 116 timeout--;
mbed_official 126:549ba18ddd81 117 if (timeout == 0) {
mbed_official 126:549ba18ddd81 118 return 1;
mbed_official 126:549ba18ddd81 119 }
mbed_official 126:549ba18ddd81 120 }
mbed_official 126:549ba18ddd81 121
mbed_official 126:549ba18ddd81 122 return 0;
mbed_official 126:549ba18ddd81 123 }
mbed_official 126:549ba18ddd81 124
mbed_official 126:549ba18ddd81 125 inline int i2c_stop(i2c_t *obj) {
mbed_official 126:549ba18ddd81 126 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 127
mbed_official 126:549ba18ddd81 128 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 126:549ba18ddd81 129
mbed_official 126:549ba18ddd81 130 return 0;
mbed_official 126:549ba18ddd81 131 }
mbed_official 126:549ba18ddd81 132
mbed_official 126:549ba18ddd81 133 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 126:549ba18ddd81 134 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 135 int timeout;
mbed_official 126:549ba18ddd81 136 int count;
mbed_official 126:549ba18ddd81 137 int value;
mbed_official 126:549ba18ddd81 138
mbed_official 126:549ba18ddd81 139 if (length == 0) return 0;
mbed_official 126:549ba18ddd81 140
mbed_official 126:549ba18ddd81 141 /*
mbed_official 126:549ba18ddd81 142 // Wait until the bus is not busy anymore
mbed_official 126:549ba18ddd81 143 timeout = LONG_TIMEOUT;
mbed_official 126:549ba18ddd81 144 while (I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY) == SET) {
mbed_official 126:549ba18ddd81 145 timeout--;
mbed_official 126:549ba18ddd81 146 if (timeout == 0) {
mbed_official 126:549ba18ddd81 147 return 0;
mbed_official 126:549ba18ddd81 148 }
mbed_official 126:549ba18ddd81 149 }
mbed_official 126:549ba18ddd81 150 */
mbed_official 126:549ba18ddd81 151
mbed_official 126:549ba18ddd81 152 i2c_start(obj);
mbed_official 126:549ba18ddd81 153
mbed_official 126:549ba18ddd81 154 // Send slave address for read
mbed_official 227:7bd0639b8911 155 I2C_Send7bitAddress(i2c, address, I2C_Direction_Receiver);
mbed_official 126:549ba18ddd81 156
mbed_official 126:549ba18ddd81 157 // Wait address is acknowledged
mbed_official 126:549ba18ddd81 158 timeout = FLAG_TIMEOUT;
mbed_official 126:549ba18ddd81 159 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) == ERROR) {
mbed_official 126:549ba18ddd81 160 timeout--;
mbed_official 126:549ba18ddd81 161 if (timeout == 0) {
mbed_official 126:549ba18ddd81 162 return 0;
mbed_official 126:549ba18ddd81 163 }
mbed_official 126:549ba18ddd81 164 }
mbed_official 126:549ba18ddd81 165
mbed_official 126:549ba18ddd81 166 // Read all bytes except last one
mbed_official 126:549ba18ddd81 167 for (count = 0; count < (length - 1); count++) {
mbed_official 126:549ba18ddd81 168 value = i2c_byte_read(obj, 0);
mbed_official 126:549ba18ddd81 169 data[count] = (char)value;
mbed_official 126:549ba18ddd81 170 }
mbed_official 126:549ba18ddd81 171
mbed_official 126:549ba18ddd81 172 // If not repeated start, send stop.
mbed_official 126:549ba18ddd81 173 // Warning: must be done BEFORE the data is read.
mbed_official 126:549ba18ddd81 174 if (stop) {
mbed_official 126:549ba18ddd81 175 i2c_stop(obj);
mbed_official 126:549ba18ddd81 176 }
mbed_official 126:549ba18ddd81 177
mbed_official 126:549ba18ddd81 178 // Read the last byte
mbed_official 126:549ba18ddd81 179 value = i2c_byte_read(obj, 1);
mbed_official 126:549ba18ddd81 180 data[count] = (char)value;
mbed_official 126:549ba18ddd81 181
mbed_official 126:549ba18ddd81 182 return length;
mbed_official 126:549ba18ddd81 183 }
mbed_official 126:549ba18ddd81 184
mbed_official 126:549ba18ddd81 185 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 126:549ba18ddd81 186 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 187 int timeout;
mbed_official 126:549ba18ddd81 188 int count;
mbed_official 126:549ba18ddd81 189
mbed_official 126:549ba18ddd81 190 /*
mbed_official 126:549ba18ddd81 191 // Wait until the bus is not busy anymore
mbed_official 126:549ba18ddd81 192 timeout = LONG_TIMEOUT;
mbed_official 126:549ba18ddd81 193 while (I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY) == SET) {
mbed_official 126:549ba18ddd81 194 timeout--;
mbed_official 126:549ba18ddd81 195 if (timeout == 0) {
mbed_official 126:549ba18ddd81 196 return 0;
mbed_official 126:549ba18ddd81 197 }
mbed_official 126:549ba18ddd81 198 }
mbed_official 126:549ba18ddd81 199 */
mbed_official 126:549ba18ddd81 200
mbed_official 126:549ba18ddd81 201 i2c_start(obj);
mbed_official 126:549ba18ddd81 202
mbed_official 126:549ba18ddd81 203 // Send slave address for write
mbed_official 126:549ba18ddd81 204 I2C_Send7bitAddress(i2c, address, I2C_Direction_Transmitter);
mbed_official 126:549ba18ddd81 205
mbed_official 126:549ba18ddd81 206 // Wait address is acknowledged
mbed_official 126:549ba18ddd81 207 timeout = FLAG_TIMEOUT;
mbed_official 126:549ba18ddd81 208 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) == ERROR) {
mbed_official 126:549ba18ddd81 209 timeout--;
mbed_official 126:549ba18ddd81 210 if (timeout == 0) {
mbed_official 126:549ba18ddd81 211 return 0;
mbed_official 126:549ba18ddd81 212 }
mbed_official 126:549ba18ddd81 213 }
mbed_official 126:549ba18ddd81 214
mbed_official 126:549ba18ddd81 215 for (count = 0; count < length; count++) {
mbed_official 126:549ba18ddd81 216 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 126:549ba18ddd81 217 i2c_stop(obj);
mbed_official 126:549ba18ddd81 218 return 0;
mbed_official 126:549ba18ddd81 219 }
mbed_official 126:549ba18ddd81 220 }
mbed_official 126:549ba18ddd81 221
mbed_official 126:549ba18ddd81 222 // If not repeated start, send stop.
mbed_official 126:549ba18ddd81 223 if (stop) {
mbed_official 126:549ba18ddd81 224 i2c_stop(obj);
mbed_official 126:549ba18ddd81 225 }
mbed_official 126:549ba18ddd81 226
mbed_official 126:549ba18ddd81 227 return count;
mbed_official 126:549ba18ddd81 228 }
mbed_official 126:549ba18ddd81 229
mbed_official 126:549ba18ddd81 230 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 126:549ba18ddd81 231 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 232 uint8_t data;
mbed_official 126:549ba18ddd81 233 int timeout;
mbed_official 126:549ba18ddd81 234
mbed_official 126:549ba18ddd81 235 if (last) {
mbed_official 126:549ba18ddd81 236 // Don't acknowledge the last byte
mbed_official 126:549ba18ddd81 237 I2C_AcknowledgeConfig(i2c, DISABLE);
mbed_official 126:549ba18ddd81 238 } else {
mbed_official 126:549ba18ddd81 239 // Acknowledge the byte
mbed_official 126:549ba18ddd81 240 I2C_AcknowledgeConfig(i2c, ENABLE);
mbed_official 126:549ba18ddd81 241 }
mbed_official 126:549ba18ddd81 242
mbed_official 126:549ba18ddd81 243 // Wait until the byte is received
mbed_official 126:549ba18ddd81 244 timeout = FLAG_TIMEOUT;
mbed_official 126:549ba18ddd81 245 while (I2C_GetFlagStatus(i2c, I2C_FLAG_RXNE) == RESET) {
mbed_official 126:549ba18ddd81 246 timeout--;
mbed_official 126:549ba18ddd81 247 if (timeout == 0) {
mbed_official 126:549ba18ddd81 248 return 0;
mbed_official 126:549ba18ddd81 249 }
mbed_official 126:549ba18ddd81 250 }
mbed_official 126:549ba18ddd81 251
mbed_official 126:549ba18ddd81 252 data = I2C_ReceiveData(i2c);
mbed_official 126:549ba18ddd81 253
mbed_official 126:549ba18ddd81 254 return (int)data;
mbed_official 126:549ba18ddd81 255 }
mbed_official 126:549ba18ddd81 256
mbed_official 126:549ba18ddd81 257 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 126:549ba18ddd81 258 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 259 int timeout;
mbed_official 126:549ba18ddd81 260
mbed_official 126:549ba18ddd81 261 I2C_SendData(i2c, (uint8_t)data);
mbed_official 126:549ba18ddd81 262
mbed_official 126:549ba18ddd81 263 // Wait until the byte is transmitted
mbed_official 227:7bd0639b8911 264 timeout = FLAG_TIMEOUT;
mbed_official 126:549ba18ddd81 265 //while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_BYTE_TRANSMITTED) == ERROR) {
mbed_official 126:549ba18ddd81 266 while ((I2C_GetFlagStatus(i2c, I2C_FLAG_TXE) == RESET) &&
mbed_official 126:549ba18ddd81 267 (I2C_GetFlagStatus(i2c, I2C_FLAG_BTF) == RESET)) {
mbed_official 126:549ba18ddd81 268 timeout--;
mbed_official 126:549ba18ddd81 269 if (timeout == 0) {
mbed_official 126:549ba18ddd81 270 return 0;
mbed_official 126:549ba18ddd81 271 }
mbed_official 126:549ba18ddd81 272 }
mbed_official 126:549ba18ddd81 273
mbed_official 126:549ba18ddd81 274 return 1;
mbed_official 126:549ba18ddd81 275 }
mbed_official 126:549ba18ddd81 276
mbed_official 126:549ba18ddd81 277 void i2c_reset(i2c_t *obj) {
mbed_official 227:7bd0639b8911 278 if (obj->i2c == I2C_1) {
mbed_official 126:549ba18ddd81 279 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 126:549ba18ddd81 280 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 126:549ba18ddd81 281 }
mbed_official 126:549ba18ddd81 282 if (obj->i2c == I2C_2) {
mbed_official 126:549ba18ddd81 283 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 227:7bd0639b8911 284 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 126:549ba18ddd81 285 }
mbed_official 126:549ba18ddd81 286 }
mbed_official 126:549ba18ddd81 287
mbed_official 126:549ba18ddd81 288 #if DEVICE_I2CSLAVE
mbed_official 126:549ba18ddd81 289
mbed_official 126:549ba18ddd81 290 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 126:549ba18ddd81 291 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 292 uint16_t tmpreg;
mbed_official 126:549ba18ddd81 293
mbed_official 126:549ba18ddd81 294 // Get the old register value
mbed_official 126:549ba18ddd81 295 tmpreg = i2c->OAR1;
mbed_official 126:549ba18ddd81 296 // Reset address bits
mbed_official 126:549ba18ddd81 297 tmpreg &= 0xFC00;
mbed_official 126:549ba18ddd81 298 // Set new address
mbed_official 126:549ba18ddd81 299 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 126:549ba18ddd81 300 // Store the new register value
mbed_official 126:549ba18ddd81 301 i2c->OAR1 = tmpreg;
mbed_official 126:549ba18ddd81 302 }
mbed_official 126:549ba18ddd81 303
mbed_official 126:549ba18ddd81 304 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 126:549ba18ddd81 305 // Nothing to do
mbed_official 126:549ba18ddd81 306 }
mbed_official 126:549ba18ddd81 307
mbed_official 126:549ba18ddd81 308 // See I2CSlave.h
mbed_official 126:549ba18ddd81 309 #define NoData 0 // the slave has not been addressed
mbed_official 126:549ba18ddd81 310 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 126:549ba18ddd81 311 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 126:549ba18ddd81 312 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 126:549ba18ddd81 313
mbed_official 126:549ba18ddd81 314 int i2c_slave_receive(i2c_t *obj) {
mbed_official 126:549ba18ddd81 315 // TO BE DONE
mbed_official 126:549ba18ddd81 316 return(0);
mbed_official 126:549ba18ddd81 317 }
mbed_official 126:549ba18ddd81 318
mbed_official 126:549ba18ddd81 319 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 126:549ba18ddd81 320 int count = 0;
mbed_official 126:549ba18ddd81 321
mbed_official 126:549ba18ddd81 322 // Read all bytes
mbed_official 126:549ba18ddd81 323 for (count = 0; count < length; count++) {
mbed_official 126:549ba18ddd81 324 data[count] = i2c_byte_read(obj, 0);
mbed_official 126:549ba18ddd81 325 }
mbed_official 126:549ba18ddd81 326
mbed_official 126:549ba18ddd81 327 return count;
mbed_official 126:549ba18ddd81 328 }
mbed_official 126:549ba18ddd81 329
mbed_official 126:549ba18ddd81 330 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 126:549ba18ddd81 331 int count = 0;
mbed_official 126:549ba18ddd81 332
mbed_official 126:549ba18ddd81 333 // Write all bytes
mbed_official 126:549ba18ddd81 334 for (count = 0; count < length; count++) {
mbed_official 126:549ba18ddd81 335 i2c_byte_write(obj, data[count]);
mbed_official 126:549ba18ddd81 336 }
mbed_official 126:549ba18ddd81 337
mbed_official 126:549ba18ddd81 338 return count;
mbed_official 126:549ba18ddd81 339 }
mbed_official 126:549ba18ddd81 340
mbed_official 126:549ba18ddd81 341
mbed_official 126:549ba18ddd81 342 #endif // DEVICE_I2CSLAVE
mbed_official 126:549ba18ddd81 343
mbed_official 126:549ba18ddd81 344 #endif // DEVICE_I2C