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targets/hal/TARGET_STM/TARGET_STM32F3XX/i2c_api.c@155:8435094ec241, 2014-04-08 (annotated)

Committer:
mbed_official
Date:
Tue Apr 08 09:15:06 2014 +0100
Revision:
155:8435094ec241
Child:
227:7bd0639b8911
Synchronized with git revision d616c415fc62f490b915ff0ff39c8d24b2917c0f



Full URL: https://github.com/mbedmicro/mbed/commit/d616c415fc62f490b915ff0ff39c8d24b2917c0f/



[STM32F3XX] Initial port

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 155:8435094ec241 1 /* mbed Microcontroller Library
mbed_official 155:8435094ec241 2 *******************************************************************************
mbed_official 155:8435094ec241 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 155:8435094ec241 4 * All rights reserved.
mbed_official 155:8435094ec241 5 *
mbed_official 155:8435094ec241 6 * Redistribution and use in source and binary forms, with or without
mbed_official 155:8435094ec241 7 * modification, are permitted provided that the following conditions are met:
mbed_official 155:8435094ec241 8 *
mbed_official 155:8435094ec241 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 155:8435094ec241 10 * this list of conditions and the following disclaimer.
mbed_official 155:8435094ec241 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 155:8435094ec241 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 155:8435094ec241 13 * and/or other materials provided with the distribution.
mbed_official 155:8435094ec241 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 155:8435094ec241 15 * may be used to endorse or promote products derived from this software
mbed_official 155:8435094ec241 16 * without specific prior written permission.
mbed_official 155:8435094ec241 17 *
mbed_official 155:8435094ec241 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 155:8435094ec241 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 155:8435094ec241 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 155:8435094ec241 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 155:8435094ec241 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 155:8435094ec241 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 155:8435094ec241 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 155:8435094ec241 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 155:8435094ec241 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 155:8435094ec241 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 155:8435094ec241 28 *******************************************************************************
mbed_official 155:8435094ec241 29 */
mbed_official 155:8435094ec241 30 #include "i2c_api.h"
mbed_official 155:8435094ec241 31
mbed_official 155:8435094ec241 32 #if DEVICE_I2C
mbed_official 155:8435094ec241 33
mbed_official 155:8435094ec241 34 #include "cmsis.h"
mbed_official 155:8435094ec241 35 #include "pinmap.h"
mbed_official 155:8435094ec241 36 #include "error.h"
mbed_official 155:8435094ec241 37
mbed_official 155:8435094ec241 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 155:8435094ec241 39 not based on accurate values, they just guarantee that the application will
mbed_official 155:8435094ec241 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 155:8435094ec241 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 155:8435094ec241 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 155:8435094ec241 43
mbed_official 155:8435094ec241 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 155:8435094ec241 45 {PA_10, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 155:8435094ec241 46 {PA_14, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 155:8435094ec241 47 {PB_5, I2C_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_8)},
mbed_official 155:8435094ec241 48 {PB_7, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 155:8435094ec241 49 {PB_9, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 155:8435094ec241 50 {PC_9, I2C_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_3)},
mbed_official 155:8435094ec241 51 {PF_0, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 155:8435094ec241 52 {NC, NC, 0}
mbed_official 155:8435094ec241 53 };
mbed_official 155:8435094ec241 54
mbed_official 155:8435094ec241 55 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 155:8435094ec241 56 {PA_8, I2C_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_3)},
mbed_official 155:8435094ec241 57 {PA_9, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 155:8435094ec241 58 {PA_15, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 155:8435094ec241 59 {PB_6, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 155:8435094ec241 60 {PB_8, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 155:8435094ec241 61 {PF_1, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 155:8435094ec241 62 {NC, NC, 0}
mbed_official 155:8435094ec241 63 };
mbed_official 155:8435094ec241 64
mbed_official 155:8435094ec241 65 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 155:8435094ec241 66 // Determine the I2C to use
mbed_official 155:8435094ec241 67 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 155:8435094ec241 68 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 155:8435094ec241 69
mbed_official 155:8435094ec241 70 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 155:8435094ec241 71
mbed_official 155:8435094ec241 72 if (obj->i2c == (I2CName)NC) {
mbed_official 155:8435094ec241 73 error("I2C pin mapping failed");
mbed_official 155:8435094ec241 74 }
mbed_official 155:8435094ec241 75
mbed_official 155:8435094ec241 76 // Enable I2C clock
mbed_official 155:8435094ec241 77 if (obj->i2c == I2C_1) {
mbed_official 155:8435094ec241 78 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 155:8435094ec241 79 }
mbed_official 155:8435094ec241 80 if (obj->i2c == I2C_2) {
mbed_official 155:8435094ec241 81 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 155:8435094ec241 82 }
mbed_official 155:8435094ec241 83 if (obj->i2c == I2C_3) {
mbed_official 155:8435094ec241 84 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C3, ENABLE);
mbed_official 155:8435094ec241 85 }
mbed_official 155:8435094ec241 86
mbed_official 155:8435094ec241 87 // Configure I2C pins
mbed_official 155:8435094ec241 88 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 155:8435094ec241 89 pin_mode(scl, OpenDrain);
mbed_official 155:8435094ec241 90 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 155:8435094ec241 91 pin_mode(sda, OpenDrain);
mbed_official 155:8435094ec241 92
mbed_official 155:8435094ec241 93 // Reset to clear pending flags if any
mbed_official 155:8435094ec241 94 i2c_reset(obj);
mbed_official 155:8435094ec241 95
mbed_official 155:8435094ec241 96 // I2C configuration
mbed_official 155:8435094ec241 97 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 155:8435094ec241 98 }
mbed_official 155:8435094ec241 99
mbed_official 155:8435094ec241 100 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 155:8435094ec241 101 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 155:8435094ec241 102 I2C_InitTypeDef I2C_InitStructure;
mbed_official 155:8435094ec241 103 uint32_t tim;
mbed_official 155:8435094ec241 104
mbed_official 155:8435094ec241 105 // Disable the Fast Mode Plus capability
mbed_official 155:8435094ec241 106 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); // Enable SYSCFG clock
mbed_official 155:8435094ec241 107 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, DISABLE);
mbed_official 155:8435094ec241 108 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, DISABLE);
mbed_official 155:8435094ec241 109
mbed_official 155:8435094ec241 110 /*
mbed_official 155:8435094ec241 111 Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
mbed_official 155:8435094ec241 112 * Standard mode (up to 100 kHz)
mbed_official 155:8435094ec241 113 * Fast Mode (up to 400 kHz)
mbed_official 155:8435094ec241 114 * Fast Mode Plus (up to 1 MHz)
mbed_official 155:8435094ec241 115 Below values obtained with:
mbed_official 155:8435094ec241 116 - I2C clock source = 8 MHz (HSI clock per default)
mbed_official 155:8435094ec241 117 - Analog filter delay = ON
mbed_official 155:8435094ec241 118 - Digital filter coefficient = 0
mbed_official 155:8435094ec241 119 - Rise time = 100 ns
mbed_official 155:8435094ec241 120 - Fall time = 10ns
mbed_official 155:8435094ec241 121 */
mbed_official 155:8435094ec241 122 switch (hz) {
mbed_official 155:8435094ec241 123 case 100000:
mbed_official 155:8435094ec241 124 tim = 0x00201D2B; // Standard mode
mbed_official 155:8435094ec241 125 break;
mbed_official 155:8435094ec241 126 case 200000:
mbed_official 155:8435094ec241 127 tim = 0x0010021E; // Fast Mode
mbed_official 155:8435094ec241 128 break;
mbed_official 155:8435094ec241 129 case 400000:
mbed_official 155:8435094ec241 130 tim = 0x0010020A; // Fast Mode
mbed_official 155:8435094ec241 131 break;
mbed_official 155:8435094ec241 132 case 1000000:
mbed_official 155:8435094ec241 133 tim = 0x00100001; // Fast Mode Plus
mbed_official 155:8435094ec241 134 // Enable the Fast Mode Plus capability
mbed_official 155:8435094ec241 135 if (obj->i2c == I2C_1) {
mbed_official 155:8435094ec241 136 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, ENABLE);
mbed_official 155:8435094ec241 137 }
mbed_official 155:8435094ec241 138 if (obj->i2c == I2C_2) {
mbed_official 155:8435094ec241 139 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, ENABLE);
mbed_official 155:8435094ec241 140 }
mbed_official 155:8435094ec241 141 break;
mbed_official 155:8435094ec241 142 default:
mbed_official 155:8435094ec241 143 error("Only 100kHz, 200kHz, 400kHz and 1MHz I2C frequencies are supported.");
mbed_official 155:8435094ec241 144 break;
mbed_official 155:8435094ec241 145 }
mbed_official 155:8435094ec241 146
mbed_official 155:8435094ec241 147 // I2C configuration
mbed_official 155:8435094ec241 148 I2C_DeInit(i2c);
mbed_official 155:8435094ec241 149 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 155:8435094ec241 150 I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
mbed_official 155:8435094ec241 151 I2C_InitStructure.I2C_DigitalFilter = 0x00;
mbed_official 155:8435094ec241 152 I2C_InitStructure.I2C_OwnAddress1 = 0x00;
mbed_official 155:8435094ec241 153 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 155:8435094ec241 154 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 155:8435094ec241 155 I2C_InitStructure.I2C_Timing = tim;
mbed_official 155:8435094ec241 156 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 155:8435094ec241 157
mbed_official 155:8435094ec241 158 I2C_Cmd(i2c, ENABLE);
mbed_official 155:8435094ec241 159 }
mbed_official 155:8435094ec241 160
mbed_official 155:8435094ec241 161 inline int i2c_start(i2c_t *obj) {
mbed_official 155:8435094ec241 162 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 155:8435094ec241 163 int timeout;
mbed_official 155:8435094ec241 164
mbed_official 155:8435094ec241 165 // Test BUSY Flag
mbed_official 155:8435094ec241 166 timeout = LONG_TIMEOUT;
mbed_official 155:8435094ec241 167 while (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) != RESET) {
mbed_official 155:8435094ec241 168 timeout--;
mbed_official 155:8435094ec241 169 if (timeout == 0) {
mbed_official 155:8435094ec241 170 return 0;
mbed_official 155:8435094ec241 171 }
mbed_official 155:8435094ec241 172 }
mbed_official 155:8435094ec241 173
mbed_official 155:8435094ec241 174 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 155:8435094ec241 175
mbed_official 155:8435094ec241 176 return 0;
mbed_official 155:8435094ec241 177 }
mbed_official 155:8435094ec241 178
mbed_official 155:8435094ec241 179 inline int i2c_stop(i2c_t *obj) {
mbed_official 155:8435094ec241 180 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 155:8435094ec241 181
mbed_official 155:8435094ec241 182 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 155:8435094ec241 183
mbed_official 155:8435094ec241 184 return 0;
mbed_official 155:8435094ec241 185 }
mbed_official 155:8435094ec241 186
mbed_official 155:8435094ec241 187 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 155:8435094ec241 188 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 155:8435094ec241 189 int count;
mbed_official 155:8435094ec241 190 int value;
mbed_official 155:8435094ec241 191
mbed_official 155:8435094ec241 192 if (length == 0) return 0;
mbed_official 155:8435094ec241 193
mbed_official 155:8435094ec241 194 // Configure slave address, nbytes, reload, end mode and start or stop generation
mbed_official 155:8435094ec241 195 I2C_TransferHandling(i2c, address, length, I2C_AutoEnd_Mode, I2C_Generate_Start_Read);
mbed_official 155:8435094ec241 196
mbed_official 155:8435094ec241 197 // Read all bytes
mbed_official 155:8435094ec241 198 for (count = 0; count < length; count++) {
mbed_official 155:8435094ec241 199 value = i2c_byte_read(obj, 0);
mbed_official 155:8435094ec241 200 data[count] = (char)value;
mbed_official 155:8435094ec241 201 }
mbed_official 155:8435094ec241 202
mbed_official 155:8435094ec241 203 return length;
mbed_official 155:8435094ec241 204 }
mbed_official 155:8435094ec241 205
mbed_official 155:8435094ec241 206 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 155:8435094ec241 207 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 155:8435094ec241 208 //int timeout;
mbed_official 155:8435094ec241 209 int count;
mbed_official 155:8435094ec241 210
mbed_official 155:8435094ec241 211 if (length == 0) return 0;
mbed_official 155:8435094ec241 212
mbed_official 155:8435094ec241 213 // [TODO] The stop is always sent even with I2C_SoftEnd_Mode. To be corrected.
mbed_official 155:8435094ec241 214
mbed_official 155:8435094ec241 215 // Configure slave address, nbytes, reload, end mode and start or stop generation
mbed_official 155:8435094ec241 216 //if (stop) {
mbed_official 155:8435094ec241 217 I2C_TransferHandling(i2c, address, length, I2C_AutoEnd_Mode, I2C_Generate_Start_Write);
mbed_official 155:8435094ec241 218 //}
mbed_official 155:8435094ec241 219 //else {
mbed_official 155:8435094ec241 220 // I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
mbed_official 155:8435094ec241 221 //}
mbed_official 155:8435094ec241 222
mbed_official 155:8435094ec241 223 // Write all bytes
mbed_official 155:8435094ec241 224 for (count = 0; count < length; count++) {
mbed_official 155:8435094ec241 225 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 155:8435094ec241 226 i2c_stop(obj);
mbed_official 155:8435094ec241 227 return 0;
mbed_official 155:8435094ec241 228 }
mbed_official 155:8435094ec241 229 }
mbed_official 155:8435094ec241 230
mbed_official 155:8435094ec241 231 /*
mbed_official 155:8435094ec241 232 if (stop) {
mbed_official 155:8435094ec241 233 // Wait until STOPF flag is set
mbed_official 155:8435094ec241 234 timeout = LONG_TIMEOUT;
mbed_official 155:8435094ec241 235 while (I2C_GetFlagStatus(i2c, I2C_ISR_STOPF) == RESET) {
mbed_official 155:8435094ec241 236 timeout--;
mbed_official 155:8435094ec241 237 if (timeout == 0) {
mbed_official 155:8435094ec241 238 return 0;
mbed_official 155:8435094ec241 239 }
mbed_official 155:8435094ec241 240 }
mbed_official 155:8435094ec241 241 // Clear STOPF flag
mbed_official 155:8435094ec241 242 I2C_ClearFlag(i2c, I2C_ICR_STOPCF);
mbed_official 155:8435094ec241 243 }
mbed_official 155:8435094ec241 244 */
mbed_official 155:8435094ec241 245
mbed_official 155:8435094ec241 246 return count;
mbed_official 155:8435094ec241 247 }
mbed_official 155:8435094ec241 248
mbed_official 155:8435094ec241 249 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 155:8435094ec241 250 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 155:8435094ec241 251 uint8_t data;
mbed_official 155:8435094ec241 252 int timeout;
mbed_official 155:8435094ec241 253
mbed_official 155:8435094ec241 254 // Wait until the byte is received
mbed_official 155:8435094ec241 255 timeout = FLAG_TIMEOUT;
mbed_official 155:8435094ec241 256 while (I2C_GetFlagStatus(i2c, I2C_ISR_RXNE) == RESET) {
mbed_official 155:8435094ec241 257 timeout--;
mbed_official 155:8435094ec241 258 if (timeout == 0) {
mbed_official 155:8435094ec241 259 return 0;
mbed_official 155:8435094ec241 260 }
mbed_official 155:8435094ec241 261 }
mbed_official 155:8435094ec241 262
mbed_official 155:8435094ec241 263 data = I2C_ReceiveData(i2c);
mbed_official 155:8435094ec241 264
mbed_official 155:8435094ec241 265 return (int)data;
mbed_official 155:8435094ec241 266 }
mbed_official 155:8435094ec241 267
mbed_official 155:8435094ec241 268 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 155:8435094ec241 269 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 155:8435094ec241 270 int timeout;
mbed_official 155:8435094ec241 271
mbed_official 155:8435094ec241 272 // Wait until the previous byte is transmitted
mbed_official 155:8435094ec241 273 timeout = FLAG_TIMEOUT;
mbed_official 155:8435094ec241 274 while (I2C_GetFlagStatus(i2c, I2C_ISR_TXIS) == RESET) {
mbed_official 155:8435094ec241 275 timeout--;
mbed_official 155:8435094ec241 276 if (timeout == 0) {
mbed_official 155:8435094ec241 277 return 0;
mbed_official 155:8435094ec241 278 }
mbed_official 155:8435094ec241 279 }
mbed_official 155:8435094ec241 280
mbed_official 155:8435094ec241 281 I2C_SendData(i2c, (uint8_t)data);
mbed_official 155:8435094ec241 282
mbed_official 155:8435094ec241 283 return 1;
mbed_official 155:8435094ec241 284 }
mbed_official 155:8435094ec241 285
mbed_official 155:8435094ec241 286 void i2c_reset(i2c_t *obj) {
mbed_official 155:8435094ec241 287 if (obj->i2c == I2C_1) {
mbed_official 155:8435094ec241 288 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 155:8435094ec241 289 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 155:8435094ec241 290 }
mbed_official 155:8435094ec241 291 if (obj->i2c == I2C_2) {
mbed_official 155:8435094ec241 292 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 155:8435094ec241 293 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 155:8435094ec241 294 }
mbed_official 155:8435094ec241 295 if (obj->i2c == I2C_3) {
mbed_official 155:8435094ec241 296 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C3, ENABLE);
mbed_official 155:8435094ec241 297 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C3, DISABLE);
mbed_official 155:8435094ec241 298 }
mbed_official 155:8435094ec241 299 }
mbed_official 155:8435094ec241 300
mbed_official 155:8435094ec241 301 #if DEVICE_I2CSLAVE
mbed_official 155:8435094ec241 302
mbed_official 155:8435094ec241 303 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 155:8435094ec241 304 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 155:8435094ec241 305 uint16_t tmpreg;
mbed_official 155:8435094ec241 306
mbed_official 155:8435094ec241 307 // Get the old register value
mbed_official 155:8435094ec241 308 tmpreg = i2c->OAR1;
mbed_official 155:8435094ec241 309 // Reset address bits
mbed_official 155:8435094ec241 310 tmpreg &= 0xFC00;
mbed_official 155:8435094ec241 311 // Set new address
mbed_official 155:8435094ec241 312 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 155:8435094ec241 313 // Store the new register value
mbed_official 155:8435094ec241 314 i2c->OAR1 = tmpreg;
mbed_official 155:8435094ec241 315 }
mbed_official 155:8435094ec241 316
mbed_official 155:8435094ec241 317 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 155:8435094ec241 318 // Nothing to do
mbed_official 155:8435094ec241 319 }
mbed_official 155:8435094ec241 320
mbed_official 155:8435094ec241 321 // See I2CSlave.h
mbed_official 155:8435094ec241 322 #define NoData 0 // the slave has not been addressed
mbed_official 155:8435094ec241 323 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 155:8435094ec241 324 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 155:8435094ec241 325 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 155:8435094ec241 326
mbed_official 155:8435094ec241 327 int i2c_slave_receive(i2c_t *obj) {
mbed_official 155:8435094ec241 328 // TO BE DONE
mbed_official 155:8435094ec241 329 return (0);
mbed_official 155:8435094ec241 330 }
mbed_official 155:8435094ec241 331
mbed_official 155:8435094ec241 332 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 155:8435094ec241 333 int count = 0;
mbed_official 155:8435094ec241 334
mbed_official 155:8435094ec241 335 // Read all bytes
mbed_official 155:8435094ec241 336 for (count = 0; count < length; count++) {
mbed_official 155:8435094ec241 337 data[count] = i2c_byte_read(obj, 0);
mbed_official 155:8435094ec241 338 }
mbed_official 155:8435094ec241 339
mbed_official 155:8435094ec241 340 return count;
mbed_official 155:8435094ec241 341 }
mbed_official 155:8435094ec241 342
mbed_official 155:8435094ec241 343 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 155:8435094ec241 344 int count = 0;
mbed_official 155:8435094ec241 345
mbed_official 155:8435094ec241 346 // Write all bytes
mbed_official 155:8435094ec241 347 for (count = 0; count < length; count++) {
mbed_official 155:8435094ec241 348 i2c_byte_write(obj, data[count]);
mbed_official 155:8435094ec241 349 }
mbed_official 155:8435094ec241 350
mbed_official 155:8435094ec241 351 return count;
mbed_official 155:8435094ec241 352 }
mbed_official 155:8435094ec241 353
mbed_official 155:8435094ec241 354
mbed_official 155:8435094ec241 355 #endif // DEVICE_I2CSLAVE
mbed_official 155:8435094ec241 356
mbed_official 155:8435094ec241 357 #endif // DEVICE_I2C