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_L152RE/i2c_api.c@227:7bd0639b8911, 2014-06-11 (annotated)

Committer:
mbed_official
Date:
Wed Jun 11 16:00:09 2014 +0100
Revision:
227:7bd0639b8911
Parent:
215:83cf97a28428
Child:
247:135e3186a638
Synchronized with git revision d58d532ebc0e0a96f4fffb8edefc082b71b964af



Full URL: https://github.com/mbedmicro/mbed/commit/d58d532ebc0e0a96f4fffb8edefc082b71b964af/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 76:aeb1df146756 1 /* mbed Microcontroller Library
mbed_official 76:aeb1df146756 2 *******************************************************************************
mbed_official 76:aeb1df146756 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 76:aeb1df146756 4 * All rights reserved.
mbed_official 76:aeb1df146756 5 *
mbed_official 76:aeb1df146756 6 * Redistribution and use in source and binary forms, with or without
mbed_official 76:aeb1df146756 7 * modification, are permitted provided that the following conditions are met:
mbed_official 76:aeb1df146756 8 *
mbed_official 76:aeb1df146756 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 76:aeb1df146756 10 * this list of conditions and the following disclaimer.
mbed_official 76:aeb1df146756 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 76:aeb1df146756 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 76:aeb1df146756 13 * and/or other materials provided with the distribution.
mbed_official 76:aeb1df146756 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 76:aeb1df146756 15 * may be used to endorse or promote products derived from this software
mbed_official 76:aeb1df146756 16 * without specific prior written permission.
mbed_official 76:aeb1df146756 17 *
mbed_official 76:aeb1df146756 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 76:aeb1df146756 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 76:aeb1df146756 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 76:aeb1df146756 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 76:aeb1df146756 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 76:aeb1df146756 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 76:aeb1df146756 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 76:aeb1df146756 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 76:aeb1df146756 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 76:aeb1df146756 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 76:aeb1df146756 28 *******************************************************************************
mbed_official 76:aeb1df146756 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 76:aeb1df146756 31 #include "i2c_api.h"
mbed_official 76:aeb1df146756 32
mbed_official 76:aeb1df146756 33 #if DEVICE_I2C
mbed_official 76:aeb1df146756 34
mbed_official 76:aeb1df146756 35 #include "cmsis.h"
mbed_official 76:aeb1df146756 36 #include "pinmap.h"
mbed_official 227:7bd0639b8911 37
mbed_official 76:aeb1df146756 38
mbed_official 76:aeb1df146756 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 174:8bb9f3a33240 40 not based on accurate values, they just guarantee that the application will
mbed_official 174:8bb9f3a33240 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 76:aeb1df146756 42 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 76:aeb1df146756 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 76:aeb1df146756 44
mbed_official 76:aeb1df146756 45 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 118:b44c45162f28 46 {PB_7, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C1)},
mbed_official 80:66393a7b209d 47 {PB_9, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C1)},
mbed_official 118:b44c45162f28 48 {PB_11, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C2)},
mbed_official 76:aeb1df146756 49 {NC, NC, 0}
mbed_official 76:aeb1df146756 50 };
mbed_official 76:aeb1df146756 51
mbed_official 76:aeb1df146756 52 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 118:b44c45162f28 53 {PB_6, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C1)},
mbed_official 80:66393a7b209d 54 {PB_8, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C1)},
mbed_official 118:b44c45162f28 55 {PB_10, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C2)},
mbed_official 76:aeb1df146756 56 {NC, NC, 0}
mbed_official 76:aeb1df146756 57 };
mbed_official 76:aeb1df146756 58
mbed_official 174:8bb9f3a33240 59 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 76:aeb1df146756 60 // Determine the I2C to use
mbed_official 76:aeb1df146756 61 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 76:aeb1df146756 62 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 76:aeb1df146756 63
mbed_official 76:aeb1df146756 64 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 65 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 76:aeb1df146756 66
mbed_official 76:aeb1df146756 67 // Enable I2C clock
mbed_official 174:8bb9f3a33240 68 if (obj->i2c == I2C_1) {
mbed_official 76:aeb1df146756 69 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 76:aeb1df146756 70 }
mbed_official 76:aeb1df146756 71 if (obj->i2c == I2C_2) {
mbed_official 76:aeb1df146756 72 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 76:aeb1df146756 73 }
mbed_official 76:aeb1df146756 74
mbed_official 76:aeb1df146756 75 // Configure I2C pins
mbed_official 80:66393a7b209d 76 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 80:66393a7b209d 77 pin_mode(scl, OpenDrain);
mbed_official 76:aeb1df146756 78 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 76:aeb1df146756 79 pin_mode(sda, OpenDrain);
mbed_official 174:8bb9f3a33240 80
mbed_official 76:aeb1df146756 81 // Reset to clear pending flags if any
mbed_official 76:aeb1df146756 82 i2c_reset(obj);
mbed_official 174:8bb9f3a33240 83
mbed_official 76:aeb1df146756 84 // I2C configuration
mbed_official 174:8bb9f3a33240 85 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 76:aeb1df146756 86 }
mbed_official 76:aeb1df146756 87
mbed_official 76:aeb1df146756 88 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 76:aeb1df146756 89 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 90 I2C_InitTypeDef I2C_InitStructure;
mbed_official 129:0182c99221bc 91
mbed_official 129:0182c99221bc 92 if (hz == 0) return;
mbed_official 129:0182c99221bc 93 if (hz > 400000) hz = 400000;
mbed_official 129:0182c99221bc 94
mbed_official 129:0182c99221bc 95 /* Warning: To use the I2C at 400 kHz (in fast mode), the PCLK1 frequency
mbed_official 129:0182c99221bc 96 (I2C peripheral input clock) must be a multiple of 10 MHz.
mbed_official 129:0182c99221bc 97 With the actual clock configuration, the max frequency is measured at 296 kHz */
mbed_official 174:8bb9f3a33240 98
mbed_official 129:0182c99221bc 99 // I2C configuration
mbed_official 129:0182c99221bc 100 I2C_DeInit(i2c);
mbed_official 129:0182c99221bc 101 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 129:0182c99221bc 102 I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
mbed_official 129:0182c99221bc 103 I2C_InitStructure.I2C_OwnAddress1 = 0;
mbed_official 129:0182c99221bc 104 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 129:0182c99221bc 105 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 129:0182c99221bc 106 I2C_InitStructure.I2C_ClockSpeed = hz;
mbed_official 129:0182c99221bc 107 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 129:0182c99221bc 108 I2C_Cmd(i2c, ENABLE);
mbed_official 76:aeb1df146756 109 }
mbed_official 76:aeb1df146756 110
mbed_official 76:aeb1df146756 111 inline int i2c_start(i2c_t *obj) {
mbed_official 76:aeb1df146756 112 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 113 int timeout;
mbed_official 174:8bb9f3a33240 114
mbed_official 76:aeb1df146756 115 I2C_ClearFlag(i2c, I2C_FLAG_AF); // Clear Acknowledge failure flag
mbed_official 174:8bb9f3a33240 116
mbed_official 76:aeb1df146756 117 // Generate the START condition
mbed_official 174:8bb9f3a33240 118 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 174:8bb9f3a33240 119
mbed_official 76:aeb1df146756 120 // Wait the START condition has been correctly sent
mbed_official 76:aeb1df146756 121 timeout = FLAG_TIMEOUT;
mbed_official 76:aeb1df146756 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 76:aeb1df146756 127 }
mbed_official 174:8bb9f3a33240 128
mbed_official 76:aeb1df146756 129 return 0;
mbed_official 76:aeb1df146756 130 }
mbed_official 76:aeb1df146756 131
mbed_official 76:aeb1df146756 132 inline int i2c_stop(i2c_t *obj) {
mbed_official 76:aeb1df146756 133 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 129:0182c99221bc 134 int timeout;
mbed_official 129:0182c99221bc 135 volatile int temp;
mbed_official 174:8bb9f3a33240 136
mbed_official 129:0182c99221bc 137 if (I2C_GetFlagStatus(i2c, I2C_FLAG_MSL) == RESET) {
mbed_official 129:0182c99221bc 138 timeout = LONG_TIMEOUT;
mbed_official 174:8bb9f3a33240 139 // wait for STOP
mbed_official 129:0182c99221bc 140 while (I2C_GetFlagStatus(i2c, I2C_FLAG_STOPF) == RESET) {
mbed_official 129:0182c99221bc 141 timeout--;
mbed_official 129:0182c99221bc 142 if (timeout == 0) {
mbed_official 129:0182c99221bc 143 return 0;
mbed_official 129:0182c99221bc 144 }
mbed_official 129:0182c99221bc 145 }
mbed_official 129:0182c99221bc 146 temp = i2c->SR1;
mbed_official 129:0182c99221bc 147 I2C_Cmd(i2c, ENABLE);
mbed_official 174:8bb9f3a33240 148 } else {
mbed_official 129:0182c99221bc 149 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 129:0182c99221bc 150 }
mbed_official 174:8bb9f3a33240 151
mbed_official 76:aeb1df146756 152 return 0;
mbed_official 76:aeb1df146756 153 }
mbed_official 76:aeb1df146756 154
mbed_official 76:aeb1df146756 155 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 76:aeb1df146756 156 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 157 int timeout;
mbed_official 76:aeb1df146756 158 int count;
mbed_official 76:aeb1df146756 159 int value;
mbed_official 174:8bb9f3a33240 160
mbed_official 76:aeb1df146756 161 if (length == 0) return 0;
mbed_official 76:aeb1df146756 162
mbed_official 76:aeb1df146756 163 i2c_start(obj);
mbed_official 76:aeb1df146756 164
mbed_official 76:aeb1df146756 165 // Send slave address for read
mbed_official 174:8bb9f3a33240 166 I2C_Send7bitAddress(i2c, address, I2C_Direction_Receiver);
mbed_official 76:aeb1df146756 167
mbed_official 76:aeb1df146756 168 // Wait address is acknowledged
mbed_official 76:aeb1df146756 169 timeout = FLAG_TIMEOUT;
mbed_official 76:aeb1df146756 170 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) == ERROR) {
mbed_official 80:66393a7b209d 171 timeout--;
mbed_official 80:66393a7b209d 172 if (timeout == 0) {
mbed_official 80:66393a7b209d 173 return 0;
mbed_official 80:66393a7b209d 174 }
mbed_official 76:aeb1df146756 175 }
mbed_official 174:8bb9f3a33240 176
mbed_official 76:aeb1df146756 177 // Read all bytes except last one
mbed_official 76:aeb1df146756 178 for (count = 0; count < (length - 1); count++) {
mbed_official 76:aeb1df146756 179 value = i2c_byte_read(obj, 0);
mbed_official 76:aeb1df146756 180 data[count] = (char)value;
mbed_official 76:aeb1df146756 181 }
mbed_official 174:8bb9f3a33240 182
mbed_official 76:aeb1df146756 183 // If not repeated start, send stop.
mbed_official 76:aeb1df146756 184 // Warning: must be done BEFORE the data is read.
mbed_official 76:aeb1df146756 185 if (stop) {
mbed_official 76:aeb1df146756 186 i2c_stop(obj);
mbed_official 76:aeb1df146756 187 }
mbed_official 76:aeb1df146756 188
mbed_official 76:aeb1df146756 189 // Read the last byte
mbed_official 76:aeb1df146756 190 value = i2c_byte_read(obj, 1);
mbed_official 76:aeb1df146756 191 data[count] = (char)value;
mbed_official 174:8bb9f3a33240 192
mbed_official 76:aeb1df146756 193 return length;
mbed_official 76:aeb1df146756 194 }
mbed_official 76:aeb1df146756 195
mbed_official 76:aeb1df146756 196 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 76:aeb1df146756 197 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 198 int timeout;
mbed_official 76:aeb1df146756 199 int count;
mbed_official 76:aeb1df146756 200
mbed_official 76:aeb1df146756 201 i2c_start(obj);
mbed_official 76:aeb1df146756 202
mbed_official 76:aeb1df146756 203 // Send slave address for write
mbed_official 76:aeb1df146756 204 I2C_Send7bitAddress(i2c, address, I2C_Direction_Transmitter);
mbed_official 174:8bb9f3a33240 205
mbed_official 76:aeb1df146756 206 // Wait address is acknowledged
mbed_official 76:aeb1df146756 207 timeout = FLAG_TIMEOUT;
mbed_official 76:aeb1df146756 208 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) == ERROR) {
mbed_official 80:66393a7b209d 209 timeout--;
mbed_official 80:66393a7b209d 210 if (timeout == 0) {
mbed_official 80:66393a7b209d 211 return 0;
mbed_official 80:66393a7b209d 212 }
mbed_official 76:aeb1df146756 213 }
mbed_official 76:aeb1df146756 214
mbed_official 76:aeb1df146756 215 for (count = 0; count < length; count++) {
mbed_official 76:aeb1df146756 216 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 76:aeb1df146756 217 i2c_stop(obj);
mbed_official 76:aeb1df146756 218 return 0;
mbed_official 76:aeb1df146756 219 }
mbed_official 76:aeb1df146756 220 }
mbed_official 76:aeb1df146756 221
mbed_official 76:aeb1df146756 222 // If not repeated start, send stop.
mbed_official 76:aeb1df146756 223 if (stop) {
mbed_official 76:aeb1df146756 224 i2c_stop(obj);
mbed_official 76:aeb1df146756 225 }
mbed_official 76:aeb1df146756 226
mbed_official 76:aeb1df146756 227 return count;
mbed_official 76:aeb1df146756 228 }
mbed_official 76:aeb1df146756 229
mbed_official 76:aeb1df146756 230 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 76:aeb1df146756 231 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 232 uint8_t data;
mbed_official 76:aeb1df146756 233 int timeout;
mbed_official 174:8bb9f3a33240 234
mbed_official 76:aeb1df146756 235 if (last) {
mbed_official 76:aeb1df146756 236 // Don't acknowledge the last byte
mbed_official 76:aeb1df146756 237 I2C_AcknowledgeConfig(i2c, DISABLE);
mbed_official 76:aeb1df146756 238 } else {
mbed_official 76:aeb1df146756 239 // Acknowledge the byte
mbed_official 76:aeb1df146756 240 I2C_AcknowledgeConfig(i2c, ENABLE);
mbed_official 76:aeb1df146756 241 }
mbed_official 76:aeb1df146756 242
mbed_official 76:aeb1df146756 243 // Wait until the byte is received
mbed_official 76:aeb1df146756 244 timeout = FLAG_TIMEOUT;
mbed_official 76:aeb1df146756 245 while (I2C_GetFlagStatus(i2c, I2C_FLAG_RXNE) == RESET) {
mbed_official 80:66393a7b209d 246 timeout--;
mbed_official 80:66393a7b209d 247 if (timeout == 0) {
mbed_official 80:66393a7b209d 248 return 0;
mbed_official 80:66393a7b209d 249 }
mbed_official 76:aeb1df146756 250 }
mbed_official 76:aeb1df146756 251
mbed_official 76:aeb1df146756 252 data = I2C_ReceiveData(i2c);
mbed_official 174:8bb9f3a33240 253
mbed_official 76:aeb1df146756 254 return (int)data;
mbed_official 76:aeb1df146756 255 }
mbed_official 76:aeb1df146756 256
mbed_official 76:aeb1df146756 257 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 76:aeb1df146756 258 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 259 int timeout;
mbed_official 76:aeb1df146756 260
mbed_official 76:aeb1df146756 261 I2C_SendData(i2c, (uint8_t)data);
mbed_official 76:aeb1df146756 262
mbed_official 76:aeb1df146756 263 // Wait until the byte is transmitted
mbed_official 129:0182c99221bc 264 timeout = FLAG_TIMEOUT;
mbed_official 76:aeb1df146756 265 while ((I2C_GetFlagStatus(i2c, I2C_FLAG_TXE) == RESET) &&
mbed_official 174:8bb9f3a33240 266 (I2C_GetFlagStatus(i2c, I2C_FLAG_BTF) == RESET)) {
mbed_official 80:66393a7b209d 267 timeout--;
mbed_official 80:66393a7b209d 268 if (timeout == 0) {
mbed_official 76:aeb1df146756 269 return 0;
mbed_official 76:aeb1df146756 270 }
mbed_official 76:aeb1df146756 271 }
mbed_official 174:8bb9f3a33240 272
mbed_official 76:aeb1df146756 273 return 1;
mbed_official 76:aeb1df146756 274 }
mbed_official 76:aeb1df146756 275
mbed_official 76:aeb1df146756 276 void i2c_reset(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 277 if (obj->i2c == I2C_1) {
mbed_official 76:aeb1df146756 278 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 76:aeb1df146756 279 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 76:aeb1df146756 280 }
mbed_official 76:aeb1df146756 281 if (obj->i2c == I2C_2) {
mbed_official 76:aeb1df146756 282 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 174:8bb9f3a33240 283 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 76:aeb1df146756 284 }
mbed_official 76:aeb1df146756 285 }
mbed_official 76:aeb1df146756 286
mbed_official 76:aeb1df146756 287 #if DEVICE_I2CSLAVE
mbed_official 76:aeb1df146756 288
mbed_official 76:aeb1df146756 289 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 76:aeb1df146756 290 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 291 uint16_t tmpreg;
mbed_official 174:8bb9f3a33240 292
mbed_official 76:aeb1df146756 293 // Get the old register value
mbed_official 76:aeb1df146756 294 tmpreg = i2c->OAR1;
mbed_official 76:aeb1df146756 295 // Reset address bits
mbed_official 76:aeb1df146756 296 tmpreg &= 0xFC00;
mbed_official 76:aeb1df146756 297 // Set new address
mbed_official 76:aeb1df146756 298 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 76:aeb1df146756 299 // Store the new register value
mbed_official 76:aeb1df146756 300 i2c->OAR1 = tmpreg;
mbed_official 76:aeb1df146756 301 }
mbed_official 76:aeb1df146756 302
mbed_official 76:aeb1df146756 303 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 76:aeb1df146756 304 // Nothing to do
mbed_official 76:aeb1df146756 305 }
mbed_official 76:aeb1df146756 306
mbed_official 76:aeb1df146756 307 // See I2CSlave.h
mbed_official 76:aeb1df146756 308 #define NoData 0 // the slave has not been addressed
mbed_official 76:aeb1df146756 309 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 76:aeb1df146756 310 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 76:aeb1df146756 311 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 76:aeb1df146756 312
mbed_official 76:aeb1df146756 313 int i2c_slave_receive(i2c_t *obj) {
mbed_official 190:bde2479eef9e 314 int retValue = NoData;
mbed_official 190:bde2479eef9e 315 uint32_t event;
mbed_official 190:bde2479eef9e 316 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 190:bde2479eef9e 317
mbed_official 215:83cf97a28428 318 event = I2C_GetLastEvent(i2c);
mbed_official 215:83cf97a28428 319 if (event != 0) {
mbed_official 215:83cf97a28428 320 switch (event) {
mbed_official 190:bde2479eef9e 321 case I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED:
mbed_official 190:bde2479eef9e 322 retValue = WriteAddressed;
mbed_official 190:bde2479eef9e 323 break;
mbed_official 190:bde2479eef9e 324 case I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED:
mbed_official 190:bde2479eef9e 325 retValue = ReadAddressed;
mbed_official 190:bde2479eef9e 326 break;
mbed_official 190:bde2479eef9e 327 case I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED:
mbed_official 190:bde2479eef9e 328 retValue = WriteGeneral;
mbed_official 190:bde2479eef9e 329 break;
mbed_official 190:bde2479eef9e 330 default:
mbed_official 190:bde2479eef9e 331 retValue = NoData;
mbed_official 190:bde2479eef9e 332 break;
mbed_official 190:bde2479eef9e 333 }
mbed_official 190:bde2479eef9e 334
mbed_official 215:83cf97a28428 335 // clear ADDR
mbed_official 215:83cf97a28428 336 if ((retValue == WriteAddressed) || (retValue == ReadAddressed)) {
mbed_official 190:bde2479eef9e 337 i2c->SR1;// read status register 1
mbed_official 190:bde2479eef9e 338 i2c->SR2;// read status register 2
mbed_official 190:bde2479eef9e 339 }
mbed_official 190:bde2479eef9e 340 // clear stopf
mbed_official 215:83cf97a28428 341 if (I2C_GetFlagStatus(i2c, I2C_FLAG_STOPF) == SET) {
mbed_official 190:bde2479eef9e 342 i2c->SR1;// read status register 1
mbed_official 215:83cf97a28428 343 I2C_Cmd(i2c, ENABLE);
mbed_official 190:bde2479eef9e 344 }
mbed_official 190:bde2479eef9e 345 // clear AF
mbed_official 215:83cf97a28428 346 if (I2C_GetFlagStatus(i2c, I2C_FLAG_AF) == SET) {
mbed_official 190:bde2479eef9e 347 I2C_ClearFlag(i2c, I2C_FLAG_AF);
mbed_official 215:83cf97a28428 348 }
mbed_official 190:bde2479eef9e 349 }
mbed_official 215:83cf97a28428 350 return (retValue);
mbed_official 76:aeb1df146756 351 }
mbed_official 76:aeb1df146756 352
mbed_official 76:aeb1df146756 353 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 76:aeb1df146756 354 int count = 0;
mbed_official 174:8bb9f3a33240 355
mbed_official 76:aeb1df146756 356 // Read all bytes
mbed_official 76:aeb1df146756 357 for (count = 0; count < length; count++) {
mbed_official 76:aeb1df146756 358 data[count] = i2c_byte_read(obj, 0);
mbed_official 76:aeb1df146756 359 }
mbed_official 174:8bb9f3a33240 360
mbed_official 76:aeb1df146756 361 return count;
mbed_official 76:aeb1df146756 362 }
mbed_official 76:aeb1df146756 363
mbed_official 76:aeb1df146756 364 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 76:aeb1df146756 365 int count = 0;
mbed_official 174:8bb9f3a33240 366
mbed_official 76:aeb1df146756 367 // Write all bytes
mbed_official 76:aeb1df146756 368 for (count = 0; count < length; count++) {
mbed_official 76:aeb1df146756 369 i2c_byte_write(obj, data[count]);
mbed_official 76:aeb1df146756 370 }
mbed_official 174:8bb9f3a33240 371
mbed_official 76:aeb1df146756 372 return count;
mbed_official 76:aeb1df146756 373 }
mbed_official 76:aeb1df146756 374
mbed_official 76:aeb1df146756 375
mbed_official 76:aeb1df146756 376 #endif // DEVICE_I2CSLAVE
mbed_official 76:aeb1df146756 377
mbed_official 76:aeb1df146756 378 #endif // DEVICE_I2C