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Mbed for VNG board

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targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/i2c_api.c@383:0564d9840d0d, 2014-11-03 (annotated)

Committer:
mbed_official
Date:
Mon Nov 03 11:00:07 2014 +0000
Revision:
383:0564d9840d0d
Parent:
305:1f0269907d8b
Child:
402:09075a3b15e3
Synchronized with git revision 835736bd23c4d618f164932584f3f2884aac42ca



Full URL: https://github.com/mbedmicro/mbed/commit/835736bd23c4d618f164932584f3f2884aac42ca/



Target: NUCLEO_F103RB - removing some un-used variables

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 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 56:99eb381a3269 31 #include "i2c_api.h"
mbed_official 56:99eb381a3269 32
mbed_official 56:99eb381a3269 33 #if DEVICE_I2C
mbed_official 56:99eb381a3269 34
mbed_official 56:99eb381a3269 35 #include "cmsis.h"
mbed_official 56:99eb381a3269 36 #include "pinmap.h"
mbed_official 56:99eb381a3269 37
mbed_official 56:99eb381a3269 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 174:8bb9f3a33240 39 not based on accurate values, they just guarantee that the application will
mbed_official 174:8bb9f3a33240 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 305:1f0269907d8b 58 int i2c1_inited = 0;
mbed_official 305:1f0269907d8b 59 int i2c2_inited = 0;
mbed_official 305:1f0269907d8b 60
mbed_official 174:8bb9f3a33240 61 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 56:99eb381a3269 62 // Determine the I2C to use
mbed_official 56:99eb381a3269 63 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 56:99eb381a3269 64 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 56:99eb381a3269 65
mbed_official 56:99eb381a3269 66 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 67 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 56:99eb381a3269 68
mbed_official 305:1f0269907d8b 69 // Enable I2C clock and configure I2C pins if not done before
mbed_official 305:1f0269907d8b 70 if ((obj->i2c == I2C_1)&& !i2c1_inited) {
mbed_official 305:1f0269907d8b 71 i2c1_inited = 1;
mbed_official 56:99eb381a3269 72 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 305:1f0269907d8b 73 // Configure I2C pins
mbed_official 305:1f0269907d8b 74 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 75 pin_mode(scl, OpenDrain);
mbed_official 305:1f0269907d8b 76 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 77 pin_mode(sda, OpenDrain);
mbed_official 56:99eb381a3269 78 }
mbed_official 305:1f0269907d8b 79 if ((obj->i2c == I2C_2)&& !i2c2_inited) {
mbed_official 305:1f0269907d8b 80 i2c2_inited = 1;
mbed_official 56:99eb381a3269 81 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 383:0564d9840d0d 82 // Configure I2C pins
mbed_official 383:0564d9840d0d 83 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 383:0564d9840d0d 84 pin_mode(scl, OpenDrain);
mbed_official 383:0564d9840d0d 85 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 383:0564d9840d0d 86 pin_mode(sda, OpenDrain);
mbed_official 383:0564d9840d0d 87 }
mbed_official 174:8bb9f3a33240 88
mbed_official 56:99eb381a3269 89 // Reset to clear pending flags if any
mbed_official 56:99eb381a3269 90 i2c_reset(obj);
mbed_official 174:8bb9f3a33240 91
mbed_official 56:99eb381a3269 92 // I2C configuration
mbed_official 174:8bb9f3a33240 93 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 56:99eb381a3269 94 }
mbed_official 56:99eb381a3269 95
mbed_official 56:99eb381a3269 96 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 383:0564d9840d0d 97 int timeout;
mbed_official 383:0564d9840d0d 98
mbed_official 383:0564d9840d0d 99 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 56:99eb381a3269 100 I2C_InitTypeDef I2C_InitStructure;
mbed_official 174:8bb9f3a33240 101
mbed_official 56:99eb381a3269 102 if ((hz != 0) && (hz <= 400000)) {
mbed_official 305:1f0269907d8b 103 // wait before init
mbed_official 305:1f0269907d8b 104 timeout = LONG_TIMEOUT;
mbed_official 383:0564d9840d0d 105 while ((I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY)) && (timeout-- != 0)) {
mbed_official 383:0564d9840d0d 106 }
mbed_official 383:0564d9840d0d 107
mbed_official 80:66393a7b209d 108 I2C_DeInit(i2c);
mbed_official 174:8bb9f3a33240 109
mbed_official 56:99eb381a3269 110 // I2C configuration
mbed_official 167:d5744491c362 111 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 167:d5744491c362 112 I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
mbed_official 167:d5744491c362 113 I2C_InitStructure.I2C_OwnAddress1 = 0;
mbed_official 167:d5744491c362 114 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 56:99eb381a3269 115 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 167:d5744491c362 116 I2C_InitStructure.I2C_ClockSpeed = hz;
mbed_official 80:66393a7b209d 117 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 174:8bb9f3a33240 118
mbed_official 56:99eb381a3269 119 I2C_Cmd(i2c, ENABLE);
mbed_official 56:99eb381a3269 120 }
mbed_official 56:99eb381a3269 121 }
mbed_official 56:99eb381a3269 122
mbed_official 56:99eb381a3269 123 inline int i2c_start(i2c_t *obj) {
mbed_official 56:99eb381a3269 124 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 383:0564d9840d0d 125 int timeout;
mbed_official 174:8bb9f3a33240 126
mbed_official 56:99eb381a3269 127 I2C_ClearFlag(i2c, I2C_FLAG_AF); // Clear Acknowledge failure flag
mbed_official 174:8bb9f3a33240 128
mbed_official 56:99eb381a3269 129 // Generate the START condition
mbed_official 174:8bb9f3a33240 130 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 174:8bb9f3a33240 131
mbed_official 56:99eb381a3269 132 // Wait the START condition has been correctly sent
mbed_official 56:99eb381a3269 133 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 134 while (I2C_GetFlagStatus(i2c, I2C_FLAG_SB) == RESET) {
mbed_official 80:66393a7b209d 135 timeout--;
mbed_official 80:66393a7b209d 136 if (timeout == 0) {
mbed_official 80:66393a7b209d 137 return 1;
mbed_official 80:66393a7b209d 138 }
mbed_official 56:99eb381a3269 139 }
mbed_official 174:8bb9f3a33240 140
mbed_official 58:3b55b7a41411 141 return 0;
mbed_official 56:99eb381a3269 142 }
mbed_official 56:99eb381a3269 143
mbed_official 56:99eb381a3269 144 inline int i2c_stop(i2c_t *obj) {
mbed_official 56:99eb381a3269 145 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 174:8bb9f3a33240 146
mbed_official 56:99eb381a3269 147 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 174:8bb9f3a33240 148
mbed_official 58:3b55b7a41411 149 return 0;
mbed_official 56:99eb381a3269 150 }
mbed_official 56:99eb381a3269 151
mbed_official 56:99eb381a3269 152 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 56:99eb381a3269 153 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 383:0564d9840d0d 154 int timeout;
mbed_official 383:0564d9840d0d 155 int count;
mbed_official 383:0564d9840d0d 156 int value;
mbed_official 174:8bb9f3a33240 157
mbed_official 56:99eb381a3269 158 i2c_start(obj);
mbed_official 56:99eb381a3269 159
mbed_official 56:99eb381a3269 160 // Send slave address for read
mbed_official 174:8bb9f3a33240 161 I2C_Send7bitAddress(i2c, address, I2C_Direction_Receiver);
mbed_official 56:99eb381a3269 162
mbed_official 56:99eb381a3269 163 // Wait address is acknowledged
mbed_official 56:99eb381a3269 164 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 165 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) == ERROR) {
mbed_official 80:66393a7b209d 166 timeout--;
mbed_official 80:66393a7b209d 167 if (timeout == 0) {
mbed_official 247:135e3186a638 168 return -1;
mbed_official 80:66393a7b209d 169 }
mbed_official 56:99eb381a3269 170 }
mbed_official 174:8bb9f3a33240 171
mbed_official 56:99eb381a3269 172 // Read all bytes except last one
mbed_official 56:99eb381a3269 173 for (count = 0; count < (length - 1); count++) {
mbed_official 383:0564d9840d0d 174 value = i2c_byte_read(obj, 0);
mbed_official 56:99eb381a3269 175 data[count] = (char)value;
mbed_official 56:99eb381a3269 176 }
mbed_official 174:8bb9f3a33240 177
mbed_official 56:99eb381a3269 178 // If not repeated start, send stop.
mbed_official 56:99eb381a3269 179 // Warning: must be done BEFORE the data is read.
mbed_official 56:99eb381a3269 180 if (stop) {
mbed_official 56:99eb381a3269 181 i2c_stop(obj);
mbed_official 56:99eb381a3269 182 }
mbed_official 56:99eb381a3269 183
mbed_official 56:99eb381a3269 184 // Read the last byte
mbed_official 383:0564d9840d0d 185 value = i2c_byte_read(obj, 1);
mbed_official 56:99eb381a3269 186 data[count] = (char)value;
mbed_official 174:8bb9f3a33240 187
mbed_official 56:99eb381a3269 188 return length;
mbed_official 56:99eb381a3269 189 }
mbed_official 56:99eb381a3269 190
mbed_official 56:99eb381a3269 191 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 56:99eb381a3269 192 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 383:0564d9840d0d 193 int timeout;
mbed_official 383:0564d9840d0d 194 int count;
mbed_official 208:4557f4bb2dd5 195
mbed_official 56:99eb381a3269 196 i2c_start(obj);
mbed_official 56:99eb381a3269 197
mbed_official 56:99eb381a3269 198 // Send slave address for write
mbed_official 56:99eb381a3269 199 I2C_Send7bitAddress(i2c, address, I2C_Direction_Transmitter);
mbed_official 174:8bb9f3a33240 200
mbed_official 56:99eb381a3269 201 // Wait address is acknowledged
mbed_official 56:99eb381a3269 202 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 203 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) == ERROR) {
mbed_official 80:66393a7b209d 204 timeout--;
mbed_official 80:66393a7b209d 205 if (timeout == 0) {
mbed_official 247:135e3186a638 206 return -1;
mbed_official 80:66393a7b209d 207 }
mbed_official 56:99eb381a3269 208 }
mbed_official 56:99eb381a3269 209
mbed_official 56:99eb381a3269 210 for (count = 0; count < length; count++) {
mbed_official 58:3b55b7a41411 211 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 58:3b55b7a41411 212 i2c_stop(obj);
mbed_official 58:3b55b7a41411 213 return 0;
mbed_official 56:99eb381a3269 214 }
mbed_official 56:99eb381a3269 215 }
mbed_official 56:99eb381a3269 216
mbed_official 56:99eb381a3269 217 // If not repeated start, send stop.
mbed_official 56:99eb381a3269 218 if (stop) {
mbed_official 56:99eb381a3269 219 i2c_stop(obj);
mbed_official 56:99eb381a3269 220 }
mbed_official 56:99eb381a3269 221
mbed_official 56:99eb381a3269 222 return count;
mbed_official 56:99eb381a3269 223 }
mbed_official 56:99eb381a3269 224
mbed_official 56:99eb381a3269 225 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 56:99eb381a3269 226 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 383:0564d9840d0d 227 uint8_t data;
mbed_official 383:0564d9840d0d 228 int timeout;
mbed_official 174:8bb9f3a33240 229
mbed_official 56:99eb381a3269 230 if (last) {
mbed_official 56:99eb381a3269 231 // Don't acknowledge the last byte
mbed_official 56:99eb381a3269 232 I2C_AcknowledgeConfig(i2c, DISABLE);
mbed_official 56:99eb381a3269 233 } else {
mbed_official 56:99eb381a3269 234 // Acknowledge the byte
mbed_official 56:99eb381a3269 235 I2C_AcknowledgeConfig(i2c, ENABLE);
mbed_official 56:99eb381a3269 236 }
mbed_official 56:99eb381a3269 237
mbed_official 56:99eb381a3269 238 // Wait until the byte is received
mbed_official 56:99eb381a3269 239 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 240 while (I2C_GetFlagStatus(i2c, I2C_FLAG_RXNE) == RESET) {
mbed_official 80:66393a7b209d 241 timeout--;
mbed_official 80:66393a7b209d 242 if (timeout == 0) {
mbed_official 247:135e3186a638 243 return -1;
mbed_official 80:66393a7b209d 244 }
mbed_official 56:99eb381a3269 245 }
mbed_official 56:99eb381a3269 246
mbed_official 56:99eb381a3269 247 data = I2C_ReceiveData(i2c);
mbed_official 174:8bb9f3a33240 248
mbed_official 56:99eb381a3269 249 return (int)data;
mbed_official 56:99eb381a3269 250 }
mbed_official 56:99eb381a3269 251
mbed_official 56:99eb381a3269 252 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 56:99eb381a3269 253 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 383:0564d9840d0d 254 int timeout;
mbed_official 56:99eb381a3269 255
mbed_official 56:99eb381a3269 256 I2C_SendData(i2c, (uint8_t)data);
mbed_official 56:99eb381a3269 257
mbed_official 56:99eb381a3269 258 // Wait until the byte is transmitted
mbed_official 208:4557f4bb2dd5 259 timeout = FLAG_TIMEOUT;
mbed_official 56:99eb381a3269 260 while ((I2C_GetFlagStatus(i2c, I2C_FLAG_TXE) == RESET) &&
mbed_official 383:0564d9840d0d 261 (I2C_GetFlagStatus(i2c, I2C_FLAG_BTF) == RESET)) {
mbed_official 80:66393a7b209d 262 timeout--;
mbed_official 80:66393a7b209d 263 if (timeout == 0) {
mbed_official 58:3b55b7a41411 264 return 0;
mbed_official 56:99eb381a3269 265 }
mbed_official 56:99eb381a3269 266 }
mbed_official 174:8bb9f3a33240 267
mbed_official 58:3b55b7a41411 268 return 1;
mbed_official 56:99eb381a3269 269 }
mbed_official 56:99eb381a3269 270
mbed_official 56:99eb381a3269 271 void i2c_reset(i2c_t *obj) {
mbed_official 305:1f0269907d8b 272 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 383:0564d9840d0d 273 int timeout;
mbed_official 383:0564d9840d0d 274
mbed_official 305:1f0269907d8b 275 // wait before reset
mbed_official 305:1f0269907d8b 276 timeout = LONG_TIMEOUT;
mbed_official 383:0564d9840d0d 277 while ((I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY)) && (timeout-- != 0)) {
mbed_official 383:0564d9840d0d 278 }
mbed_official 383:0564d9840d0d 279
mbed_official 174:8bb9f3a33240 280 if (obj->i2c == I2C_1) {
mbed_official 56:99eb381a3269 281 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 56:99eb381a3269 282 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 56:99eb381a3269 283 }
mbed_official 56:99eb381a3269 284 if (obj->i2c == I2C_2) {
mbed_official 56:99eb381a3269 285 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 174:8bb9f3a33240 286 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 56:99eb381a3269 287 }
mbed_official 56:99eb381a3269 288 }
mbed_official 56:99eb381a3269 289
mbed_official 56:99eb381a3269 290 #if DEVICE_I2CSLAVE
mbed_official 56:99eb381a3269 291
mbed_official 56:99eb381a3269 292 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 56:99eb381a3269 293 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 383:0564d9840d0d 294 uint16_t tmpreg;
mbed_official 174:8bb9f3a33240 295
mbed_official 56:99eb381a3269 296 // Get the old register value
mbed_official 56:99eb381a3269 297 tmpreg = i2c->OAR1;
mbed_official 56:99eb381a3269 298 // Reset address bits
mbed_official 56:99eb381a3269 299 tmpreg &= 0xFC00;
mbed_official 56:99eb381a3269 300 // Set new address
mbed_official 56:99eb381a3269 301 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 56:99eb381a3269 302 // Store the new register value
mbed_official 56:99eb381a3269 303 i2c->OAR1 = tmpreg;
mbed_official 56:99eb381a3269 304 }
mbed_official 56:99eb381a3269 305
mbed_official 56:99eb381a3269 306 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 56:99eb381a3269 307 // Nothing to do
mbed_official 56:99eb381a3269 308 }
mbed_official 56:99eb381a3269 309
mbed_official 58:3b55b7a41411 310 // See I2CSlave.h
mbed_official 58:3b55b7a41411 311 #define NoData 0 // the slave has not been addressed
mbed_official 58:3b55b7a41411 312 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 58:3b55b7a41411 313 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 58:3b55b7a41411 314 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 56:99eb381a3269 315
mbed_official 56:99eb381a3269 316 int i2c_slave_receive(i2c_t *obj) {
mbed_official 383:0564d9840d0d 317 int retValue = NoData;
mbed_official 383:0564d9840d0d 318 uint32_t event;
mbed_official 181:a4cbdfbbd2f4 319 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 320
mbed_official 208:4557f4bb2dd5 321 event = I2C_GetLastEvent(i2c);
mbed_official 208:4557f4bb2dd5 322 if (event != 0) {
mbed_official 208:4557f4bb2dd5 323 switch (event) {
mbed_official 181:a4cbdfbbd2f4 324 case I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED:
mbed_official 181:a4cbdfbbd2f4 325 retValue = WriteAddressed;
mbed_official 181:a4cbdfbbd2f4 326 break;
mbed_official 181:a4cbdfbbd2f4 327 case I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED:
mbed_official 181:a4cbdfbbd2f4 328 retValue = ReadAddressed;
mbed_official 181:a4cbdfbbd2f4 329 break;
mbed_official 181:a4cbdfbbd2f4 330 case I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED:
mbed_official 181:a4cbdfbbd2f4 331 retValue = WriteGeneral;
mbed_official 181:a4cbdfbbd2f4 332 break;
mbed_official 181:a4cbdfbbd2f4 333 default:
mbed_official 181:a4cbdfbbd2f4 334 retValue = NoData;
mbed_official 181:a4cbdfbbd2f4 335 break;
mbed_official 181:a4cbdfbbd2f4 336 }
mbed_official 181:a4cbdfbbd2f4 337
mbed_official 208:4557f4bb2dd5 338 // clear ADDR
mbed_official 208:4557f4bb2dd5 339 if ((retValue == WriteAddressed) || (retValue == ReadAddressed)) {
mbed_official 181:a4cbdfbbd2f4 340 // read SR to clear ADDR flag
mbed_official 181:a4cbdfbbd2f4 341 i2c->SR1;
mbed_official 181:a4cbdfbbd2f4 342 i2c->SR2;
mbed_official 181:a4cbdfbbd2f4 343 }
mbed_official 181:a4cbdfbbd2f4 344 // clear stopf
mbed_official 208:4557f4bb2dd5 345 if (I2C_GetFlagStatus(i2c, I2C_FLAG_STOPF) == SET) {
mbed_official 181:a4cbdfbbd2f4 346 // read SR1 and write CR1 to clear STOP flag
mbed_official 181:a4cbdfbbd2f4 347 i2c->SR1;
mbed_official 208:4557f4bb2dd5 348 I2C_Cmd(i2c, ENABLE);
mbed_official 181:a4cbdfbbd2f4 349 }
mbed_official 181:a4cbdfbbd2f4 350 // clear AF
mbed_official 208:4557f4bb2dd5 351 if (I2C_GetFlagStatus(i2c, I2C_FLAG_AF) == SET) {
mbed_official 181:a4cbdfbbd2f4 352 I2C_ClearFlag(i2c, I2C_FLAG_AF);
mbed_official 208:4557f4bb2dd5 353 }
mbed_official 181:a4cbdfbbd2f4 354 }
mbed_official 208:4557f4bb2dd5 355 return (retValue);
mbed_official 56:99eb381a3269 356 }
mbed_official 56:99eb381a3269 357
mbed_official 56:99eb381a3269 358 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 58:3b55b7a41411 359 int count = 0;
mbed_official 174:8bb9f3a33240 360
mbed_official 58:3b55b7a41411 361 // Read all bytes
mbed_official 58:3b55b7a41411 362 for (count = 0; count < length; count++) {
mbed_official 58:3b55b7a41411 363 data[count] = i2c_byte_read(obj, 0);
mbed_official 58:3b55b7a41411 364 }
mbed_official 174:8bb9f3a33240 365
mbed_official 58:3b55b7a41411 366 return count;
mbed_official 56:99eb381a3269 367 }
mbed_official 56:99eb381a3269 368
mbed_official 56:99eb381a3269 369 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 58:3b55b7a41411 370 int count = 0;
mbed_official 174:8bb9f3a33240 371
mbed_official 58:3b55b7a41411 372 // Write all bytes
mbed_official 58:3b55b7a41411 373 for (count = 0; count < length; count++) {
mbed_official 58:3b55b7a41411 374 i2c_byte_write(obj, data[count]);
mbed_official 58:3b55b7a41411 375 }
mbed_official 174:8bb9f3a33240 376
mbed_official 58:3b55b7a41411 377 return count;
mbed_official 56:99eb381a3269 378 }
mbed_official 56:99eb381a3269 379
mbed_official 56:99eb381a3269 380 #endif // DEVICE_I2CSLAVE
mbed_official 56:99eb381a3269 381
mbed_official 56:99eb381a3269 382 #endif // DEVICE_I2C