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Mbed for VNG board

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_STM32F407VG/i2c_api.c@428:4ddf7f7eabbb, 2014-12-08 (annotated)

Committer:
mbed_official
Date:
Mon Dec 08 07:30:07 2014 +0000
Revision:
428:4ddf7f7eabbb
Parent:
296:ec1b66a3d094 
Synchronized with git revision 3413e21e59b8b0d03c0addac95b1ead87f0b7965



Full URL: https://github.com/mbedmicro/mbed/commit/3413e21e59b8b0d03c0addac95b1ead87f0b7965/



Gitignore - Ignore cscope and vim swap files

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 133:d4dda5c437f0 1 /* mbed Microcontroller Library
mbed_official 133:d4dda5c437f0 2 *******************************************************************************
mbed_official 133:d4dda5c437f0 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 133:d4dda5c437f0 4 * All rights reserved.
mbed_official 133:d4dda5c437f0 5 *
mbed_official 133:d4dda5c437f0 6 * Redistribution and use in source and binary forms, with or without
mbed_official 133:d4dda5c437f0 7 * modification, are permitted provided that the following conditions are met:
mbed_official 133:d4dda5c437f0 8 *
mbed_official 133:d4dda5c437f0 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 133:d4dda5c437f0 10 * this list of conditions and the following disclaimer.
mbed_official 133:d4dda5c437f0 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 133:d4dda5c437f0 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 133:d4dda5c437f0 13 * and/or other materials provided with the distribution.
mbed_official 133:d4dda5c437f0 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 133:d4dda5c437f0 15 * may be used to endorse or promote products derived from this software
mbed_official 133:d4dda5c437f0 16 * without specific prior written permission.
mbed_official 133:d4dda5c437f0 17 *
mbed_official 133:d4dda5c437f0 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 133:d4dda5c437f0 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 133:d4dda5c437f0 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 133:d4dda5c437f0 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 133:d4dda5c437f0 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 133:d4dda5c437f0 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 133:d4dda5c437f0 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 133:d4dda5c437f0 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 133:d4dda5c437f0 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 133:d4dda5c437f0 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 133:d4dda5c437f0 28 *******************************************************************************
mbed_official 133:d4dda5c437f0 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 133:d4dda5c437f0 31 #include "i2c_api.h"
mbed_official 133:d4dda5c437f0 32
mbed_official 133:d4dda5c437f0 33 #if DEVICE_I2C
mbed_official 133:d4dda5c437f0 34
mbed_official 133:d4dda5c437f0 35 #include "cmsis.h"
mbed_official 133:d4dda5c437f0 36 #include "pinmap.h"
mbed_official 428:4ddf7f7eabbb 37 #include "PeripheralPins.h"
mbed_official 133:d4dda5c437f0 38
mbed_official 133:d4dda5c437f0 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 227:7bd0639b8911 40 not based on accurate values, they just guarantee that the application will
mbed_official 227:7bd0639b8911 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 133:d4dda5c437f0 42 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 133:d4dda5c437f0 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 133:d4dda5c437f0 44
mbed_official 133:d4dda5c437f0 45 I2C_HandleTypeDef I2cHandle;
mbed_official 133:d4dda5c437f0 46
mbed_official 227:7bd0639b8911 47 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 133:d4dda5c437f0 48 // Determine the I2C to use
mbed_official 133:d4dda5c437f0 49 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 133:d4dda5c437f0 50 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 133:d4dda5c437f0 51
mbed_official 133:d4dda5c437f0 52 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 53 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 133:d4dda5c437f0 54
mbed_official 133:d4dda5c437f0 55 // Enable I2C clock
mbed_official 227:7bd0639b8911 56 if (obj->i2c == I2C_1) {
mbed_official 133:d4dda5c437f0 57 __I2C1_CLK_ENABLE();
mbed_official 133:d4dda5c437f0 58 }
mbed_official 133:d4dda5c437f0 59 if (obj->i2c == I2C_2) {
mbed_official 133:d4dda5c437f0 60 __I2C2_CLK_ENABLE();
mbed_official 133:d4dda5c437f0 61 }
mbed_official 133:d4dda5c437f0 62 if (obj->i2c == I2C_3) {
mbed_official 133:d4dda5c437f0 63 __I2C3_CLK_ENABLE();
mbed_official 133:d4dda5c437f0 64 }
mbed_official 133:d4dda5c437f0 65
mbed_official 133:d4dda5c437f0 66 // Configure I2C pins
mbed_official 133:d4dda5c437f0 67 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 133:d4dda5c437f0 68 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 133:d4dda5c437f0 69 pin_mode(sda, OpenDrain);
mbed_official 133:d4dda5c437f0 70 pin_mode(scl, OpenDrain);
mbed_official 133:d4dda5c437f0 71
mbed_official 133:d4dda5c437f0 72 // Reset to clear pending flags if any
mbed_official 133:d4dda5c437f0 73 i2c_reset(obj);
mbed_official 133:d4dda5c437f0 74
mbed_official 133:d4dda5c437f0 75 // I2C configuration
mbed_official 227:7bd0639b8911 76 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 242:7074e42da0b2 77
mbed_official 242:7074e42da0b2 78 // I2C master by default
mbed_official 242:7074e42da0b2 79 obj->slave = 0;
mbed_official 133:d4dda5c437f0 80 }
mbed_official 133:d4dda5c437f0 81
mbed_official 133:d4dda5c437f0 82 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 227:7bd0639b8911 83 MBED_ASSERT((hz != 0) && (hz <= 400000));
mbed_official 133:d4dda5c437f0 84 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 85
mbed_official 227:7bd0639b8911 86
mbed_official 227:7bd0639b8911 87 // I2C configuration
mbed_official 227:7bd0639b8911 88 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 227:7bd0639b8911 89 I2cHandle.Init.ClockSpeed = hz;
mbed_official 227:7bd0639b8911 90 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 227:7bd0639b8911 91 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
mbed_official 227:7bd0639b8911 92 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 227:7bd0639b8911 93 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 227:7bd0639b8911 94 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 227:7bd0639b8911 95 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 227:7bd0639b8911 96 HAL_I2C_Init(&I2cHandle);
mbed_official 242:7074e42da0b2 97 if (obj->slave) {
mbed_official 242:7074e42da0b2 98 /* Enable Address Acknowledge */
mbed_official 242:7074e42da0b2 99 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 242:7074e42da0b2 100 }
mbed_official 227:7bd0639b8911 101
mbed_official 133:d4dda5c437f0 102 }
mbed_official 133:d4dda5c437f0 103
mbed_official 133:d4dda5c437f0 104 inline int i2c_start(i2c_t *obj) {
mbed_official 133:d4dda5c437f0 105 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 106 int timeout;
mbed_official 133:d4dda5c437f0 107
mbed_official 133:d4dda5c437f0 108 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 109
mbed_official 133:d4dda5c437f0 110 // Clear Acknowledge failure flag
mbed_official 133:d4dda5c437f0 111 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 133:d4dda5c437f0 112
mbed_official 133:d4dda5c437f0 113 // Generate the START condition
mbed_official 133:d4dda5c437f0 114 i2c->CR1 |= I2C_CR1_START;
mbed_official 133:d4dda5c437f0 115
mbed_official 133:d4dda5c437f0 116 // Wait the START condition has been correctly sent
mbed_official 133:d4dda5c437f0 117 timeout = FLAG_TIMEOUT;
mbed_official 133:d4dda5c437f0 118 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 133:d4dda5c437f0 119 if ((timeout--) == 0) {
mbed_official 133:d4dda5c437f0 120 return 1;
mbed_official 133:d4dda5c437f0 121 }
mbed_official 133:d4dda5c437f0 122 }
mbed_official 133:d4dda5c437f0 123
mbed_official 133:d4dda5c437f0 124 return 0;
mbed_official 133:d4dda5c437f0 125 }
mbed_official 133:d4dda5c437f0 126
mbed_official 133:d4dda5c437f0 127 inline int i2c_stop(i2c_t *obj) {
mbed_official 133:d4dda5c437f0 128 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 129
mbed_official 133:d4dda5c437f0 130 // Generate the STOP condition
mbed_official 133:d4dda5c437f0 131 i2c->CR1 |= I2C_CR1_STOP;
mbed_official 133:d4dda5c437f0 132
mbed_official 133:d4dda5c437f0 133 return 0;
mbed_official 133:d4dda5c437f0 134 }
mbed_official 133:d4dda5c437f0 135
mbed_official 227:7bd0639b8911 136 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 242:7074e42da0b2 137 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 242:7074e42da0b2 138 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 242:7074e42da0b2 139 int timeout;
mbed_official 242:7074e42da0b2 140 int count;
mbed_official 242:7074e42da0b2 141 int value;
mbed_official 242:7074e42da0b2 142
mbed_official 133:d4dda5c437f0 143 if (length == 0) return 0;
mbed_official 133:d4dda5c437f0 144
mbed_official 242:7074e42da0b2 145 i2c_start(obj);
mbed_official 242:7074e42da0b2 146
mbed_official 242:7074e42da0b2 147 // Wait until SB flag is set
mbed_official 242:7074e42da0b2 148 timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 149 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 242:7074e42da0b2 150 timeout--;
mbed_official 242:7074e42da0b2 151 if (timeout == 0) {
mbed_official 242:7074e42da0b2 152 return 0;
mbed_official 242:7074e42da0b2 153 }
mbed_official 242:7074e42da0b2 154 }
mbed_official 242:7074e42da0b2 155
mbed_official 242:7074e42da0b2 156 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
mbed_official 242:7074e42da0b2 157
mbed_official 133:d4dda5c437f0 158
mbed_official 242:7074e42da0b2 159 // Wait address is acknowledged
mbed_official 242:7074e42da0b2 160 timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 161 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 242:7074e42da0b2 162 timeout--;
mbed_official 242:7074e42da0b2 163 if (timeout == 0) {
mbed_official 242:7074e42da0b2 164 return 0;
mbed_official 242:7074e42da0b2 165 }
mbed_official 133:d4dda5c437f0 166 }
mbed_official 242:7074e42da0b2 167 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 242:7074e42da0b2 168
mbed_official 242:7074e42da0b2 169 // Read all bytes except last one
mbed_official 242:7074e42da0b2 170 for (count = 0; count < (length - 1); count++) {
mbed_official 242:7074e42da0b2 171 value = i2c_byte_read(obj, 0);
mbed_official 242:7074e42da0b2 172 data[count] = (char)value;
mbed_official 242:7074e42da0b2 173 }
mbed_official 242:7074e42da0b2 174
mbed_official 242:7074e42da0b2 175 // If not repeated start, send stop.
mbed_official 242:7074e42da0b2 176 // Warning: must be done BEFORE the data is read.
mbed_official 242:7074e42da0b2 177 if (stop) {
mbed_official 242:7074e42da0b2 178 i2c_stop(obj);
mbed_official 242:7074e42da0b2 179 }
mbed_official 242:7074e42da0b2 180
mbed_official 242:7074e42da0b2 181 // Read the last byte
mbed_official 242:7074e42da0b2 182 value = i2c_byte_read(obj, 1);
mbed_official 242:7074e42da0b2 183 data[count] = (char)value;
mbed_official 133:d4dda5c437f0 184
mbed_official 133:d4dda5c437f0 185 return length;
mbed_official 133:d4dda5c437f0 186 }
mbed_official 133:d4dda5c437f0 187
mbed_official 133:d4dda5c437f0 188 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 242:7074e42da0b2 189 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 242:7074e42da0b2 190 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 242:7074e42da0b2 191 int timeout;
mbed_official 242:7074e42da0b2 192 int count;
mbed_official 242:7074e42da0b2 193
mbed_official 133:d4dda5c437f0 194 if (length == 0) return 0;
mbed_official 242:7074e42da0b2 195 i2c_start(obj);
mbed_official 133:d4dda5c437f0 196
mbed_official 242:7074e42da0b2 197 // Wait until SB flag is set
mbed_official 242:7074e42da0b2 198 timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 199 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 242:7074e42da0b2 200 timeout--;
mbed_official 242:7074e42da0b2 201 if (timeout == 0) {
mbed_official 242:7074e42da0b2 202 return 0;
mbed_official 242:7074e42da0b2 203 }
mbed_official 242:7074e42da0b2 204 }
mbed_official 242:7074e42da0b2 205
mbed_official 242:7074e42da0b2 206 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
mbed_official 242:7074e42da0b2 207
mbed_official 133:d4dda5c437f0 208
mbed_official 242:7074e42da0b2 209 // Wait address is acknowledged
mbed_official 242:7074e42da0b2 210 timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 211 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 242:7074e42da0b2 212 timeout--;
mbed_official 242:7074e42da0b2 213 if (timeout == 0) {
mbed_official 242:7074e42da0b2 214 return 0;
mbed_official 242:7074e42da0b2 215 }
mbed_official 133:d4dda5c437f0 216 }
mbed_official 242:7074e42da0b2 217 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 133:d4dda5c437f0 218
mbed_official 242:7074e42da0b2 219 for (count = 0; count < length; count++) {
mbed_official 242:7074e42da0b2 220 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 242:7074e42da0b2 221 i2c_stop(obj);
mbed_official 242:7074e42da0b2 222 return 0;
mbed_official 242:7074e42da0b2 223 }
mbed_official 242:7074e42da0b2 224 }
mbed_official 242:7074e42da0b2 225
mbed_official 242:7074e42da0b2 226 // If not repeated start, send stop.
mbed_official 242:7074e42da0b2 227 if (stop) {
mbed_official 242:7074e42da0b2 228 i2c_stop(obj);
mbed_official 242:7074e42da0b2 229 }
mbed_official 242:7074e42da0b2 230
mbed_official 242:7074e42da0b2 231 return count;
mbed_official 133:d4dda5c437f0 232 }
mbed_official 133:d4dda5c437f0 233
mbed_official 133:d4dda5c437f0 234 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 133:d4dda5c437f0 235 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 236 int timeout;
mbed_official 133:d4dda5c437f0 237
mbed_official 133:d4dda5c437f0 238 if (last) {
mbed_official 133:d4dda5c437f0 239 // Don't acknowledge the last byte
mbed_official 133:d4dda5c437f0 240 i2c->CR1 &= ~I2C_CR1_ACK;
mbed_official 133:d4dda5c437f0 241 } else {
mbed_official 133:d4dda5c437f0 242 // Acknowledge the byte
mbed_official 133:d4dda5c437f0 243 i2c->CR1 |= I2C_CR1_ACK;
mbed_official 133:d4dda5c437f0 244 }
mbed_official 133:d4dda5c437f0 245
mbed_official 133:d4dda5c437f0 246 // Wait until the byte is received
mbed_official 133:d4dda5c437f0 247 timeout = FLAG_TIMEOUT;
mbed_official 133:d4dda5c437f0 248 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 133:d4dda5c437f0 249 if ((timeout--) == 0) {
mbed_official 133:d4dda5c437f0 250 return 0;
mbed_official 133:d4dda5c437f0 251 }
mbed_official 133:d4dda5c437f0 252 }
mbed_official 133:d4dda5c437f0 253
mbed_official 133:d4dda5c437f0 254 return (int)i2c->DR;
mbed_official 133:d4dda5c437f0 255 }
mbed_official 133:d4dda5c437f0 256
mbed_official 133:d4dda5c437f0 257 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 133:d4dda5c437f0 258 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 259 int timeout;
mbed_official 133:d4dda5c437f0 260
mbed_official 133:d4dda5c437f0 261 i2c->DR = (uint8_t)data;
mbed_official 133:d4dda5c437f0 262
mbed_official 133:d4dda5c437f0 263 // Wait until the byte is transmitted
mbed_official 227:7bd0639b8911 264 timeout = FLAG_TIMEOUT;
mbed_official 133:d4dda5c437f0 265 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
mbed_official 133:d4dda5c437f0 266 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
mbed_official 133:d4dda5c437f0 267 if ((timeout--) == 0) {
mbed_official 133:d4dda5c437f0 268 return 0;
mbed_official 133:d4dda5c437f0 269 }
mbed_official 133:d4dda5c437f0 270 }
mbed_official 133:d4dda5c437f0 271
mbed_official 133:d4dda5c437f0 272 return 1;
mbed_official 133:d4dda5c437f0 273 }
mbed_official 133:d4dda5c437f0 274
mbed_official 133:d4dda5c437f0 275 void i2c_reset(i2c_t *obj) {
mbed_official 227:7bd0639b8911 276 if (obj->i2c == I2C_1) {
mbed_official 133:d4dda5c437f0 277 __I2C1_FORCE_RESET();
mbed_official 133:d4dda5c437f0 278 __I2C1_RELEASE_RESET();
mbed_official 133:d4dda5c437f0 279 }
mbed_official 133:d4dda5c437f0 280 if (obj->i2c == I2C_2) {
mbed_official 133:d4dda5c437f0 281 __I2C2_FORCE_RESET();
mbed_official 133:d4dda5c437f0 282 __I2C2_RELEASE_RESET();
mbed_official 133:d4dda5c437f0 283 }
mbed_official 133:d4dda5c437f0 284 if (obj->i2c == I2C_3) {
mbed_official 133:d4dda5c437f0 285 __I2C3_FORCE_RESET();
mbed_official 133:d4dda5c437f0 286 __I2C3_RELEASE_RESET();
mbed_official 133:d4dda5c437f0 287 }
mbed_official 133:d4dda5c437f0 288 }
mbed_official 133:d4dda5c437f0 289
mbed_official 133:d4dda5c437f0 290 #if DEVICE_I2CSLAVE
mbed_official 133:d4dda5c437f0 291
mbed_official 133:d4dda5c437f0 292 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 133:d4dda5c437f0 293 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 242:7074e42da0b2 294 uint16_t tmpreg = 0;
mbed_official 133:d4dda5c437f0 295
mbed_official 133:d4dda5c437f0 296 // Get the old register value
mbed_official 133:d4dda5c437f0 297 tmpreg = i2c->OAR1;
mbed_official 133:d4dda5c437f0 298 // Reset address bits
mbed_official 133:d4dda5c437f0 299 tmpreg &= 0xFC00;
mbed_official 133:d4dda5c437f0 300 // Set new address
mbed_official 133:d4dda5c437f0 301 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 133:d4dda5c437f0 302 // Store the new register value
mbed_official 133:d4dda5c437f0 303 i2c->OAR1 = tmpreg;
mbed_official 133:d4dda5c437f0 304 }
mbed_official 133:d4dda5c437f0 305
mbed_official 133:d4dda5c437f0 306 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 242:7074e42da0b2 307 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 242:7074e42da0b2 308 if (enable_slave) {
mbed_official 242:7074e42da0b2 309 obj->slave = 1;
mbed_official 242:7074e42da0b2 310 /* Enable Address Acknowledge */
mbed_official 242:7074e42da0b2 311 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 242:7074e42da0b2 312 }
mbed_official 133:d4dda5c437f0 313 }
mbed_official 133:d4dda5c437f0 314
mbed_official 133:d4dda5c437f0 315 // See I2CSlave.h
mbed_official 133:d4dda5c437f0 316 #define NoData 0 // the slave has not been addressed
mbed_official 133:d4dda5c437f0 317 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 133:d4dda5c437f0 318 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 133:d4dda5c437f0 319 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 133:d4dda5c437f0 320
mbed_official 133:d4dda5c437f0 321 int i2c_slave_receive(i2c_t *obj) {
mbed_official 242:7074e42da0b2 322 int retValue = NoData;
mbed_official 242:7074e42da0b2 323
mbed_official 242:7074e42da0b2 324 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 242:7074e42da0b2 325 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 242:7074e42da0b2 326 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1)
mbed_official 242:7074e42da0b2 327 retValue = ReadAddressed;
mbed_official 242:7074e42da0b2 328 else
mbed_official 242:7074e42da0b2 329 retValue = WriteAddressed;
mbed_official 242:7074e42da0b2 330
mbed_official 242:7074e42da0b2 331 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 242:7074e42da0b2 332 }
mbed_official 242:7074e42da0b2 333 }
mbed_official 242:7074e42da0b2 334
mbed_official 242:7074e42da0b2 335 return (retValue);
mbed_official 133:d4dda5c437f0 336 }
mbed_official 133:d4dda5c437f0 337
mbed_official 133:d4dda5c437f0 338 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 242:7074e42da0b2 339 uint32_t Timeout;
mbed_official 242:7074e42da0b2 340 int size = 0;
mbed_official 133:d4dda5c437f0 341 if (length == 0) return 0;
mbed_official 133:d4dda5c437f0 342
mbed_official 133:d4dda5c437f0 343 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 344
mbed_official 242:7074e42da0b2 345 while (length > 0) {
mbed_official 242:7074e42da0b2 346 /* Wait until RXNE flag is set */
mbed_official 242:7074e42da0b2 347 // Wait until the byte is received
mbed_official 242:7074e42da0b2 348 Timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 349 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 242:7074e42da0b2 350 Timeout--;
mbed_official 242:7074e42da0b2 351 if (Timeout == 0) {
mbed_official 242:7074e42da0b2 352 return 0;
mbed_official 242:7074e42da0b2 353 }
mbed_official 242:7074e42da0b2 354 }
mbed_official 242:7074e42da0b2 355
mbed_official 242:7074e42da0b2 356 /* Read data from DR */
mbed_official 242:7074e42da0b2 357 (*data++) = I2cHandle.Instance->DR;
mbed_official 242:7074e42da0b2 358 length--;
mbed_official 242:7074e42da0b2 359 size++;
mbed_official 242:7074e42da0b2 360
mbed_official 242:7074e42da0b2 361 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 242:7074e42da0b2 362 /* Read data from DR */
mbed_official 242:7074e42da0b2 363 (*data++) = I2cHandle.Instance->DR;
mbed_official 242:7074e42da0b2 364 length--;
mbed_official 242:7074e42da0b2 365 size++;
mbed_official 242:7074e42da0b2 366 }
mbed_official 133:d4dda5c437f0 367 }
mbed_official 133:d4dda5c437f0 368
mbed_official 242:7074e42da0b2 369 /* Wait until STOP flag is set */
mbed_official 242:7074e42da0b2 370 Timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 371 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 242:7074e42da0b2 372 Timeout--;
mbed_official 242:7074e42da0b2 373 if (Timeout == 0) {
mbed_official 242:7074e42da0b2 374 return 0;
mbed_official 242:7074e42da0b2 375 }
mbed_official 242:7074e42da0b2 376 }
mbed_official 242:7074e42da0b2 377
mbed_official 242:7074e42da0b2 378 /* Clear STOP flag */
mbed_official 242:7074e42da0b2 379 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
mbed_official 242:7074e42da0b2 380
mbed_official 242:7074e42da0b2 381 /* Wait until BUSY flag is reset */
mbed_official 242:7074e42da0b2 382 Timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 383 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 242:7074e42da0b2 384 Timeout--;
mbed_official 242:7074e42da0b2 385 if (Timeout == 0) {
mbed_official 242:7074e42da0b2 386 return 0;
mbed_official 242:7074e42da0b2 387 }
mbed_official 242:7074e42da0b2 388 }
mbed_official 242:7074e42da0b2 389
mbed_official 242:7074e42da0b2 390 return size;
mbed_official 133:d4dda5c437f0 391 }
mbed_official 133:d4dda5c437f0 392
mbed_official 133:d4dda5c437f0 393 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 242:7074e42da0b2 394 uint32_t Timeout;
mbed_official 242:7074e42da0b2 395 int size = 0;
mbed_official 133:d4dda5c437f0 396 if (length == 0) return 0;
mbed_official 133:d4dda5c437f0 397
mbed_official 133:d4dda5c437f0 398 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 399
mbed_official 242:7074e42da0b2 400 while (length > 0) {
mbed_official 242:7074e42da0b2 401 /* Wait until TXE flag is set */
mbed_official 242:7074e42da0b2 402 Timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 403 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
mbed_official 242:7074e42da0b2 404 Timeout--;
mbed_official 242:7074e42da0b2 405 if (Timeout == 0) {
mbed_official 242:7074e42da0b2 406 return 0;
mbed_official 242:7074e42da0b2 407 }
mbed_official 242:7074e42da0b2 408 }
mbed_official 242:7074e42da0b2 409
mbed_official 242:7074e42da0b2 410
mbed_official 242:7074e42da0b2 411 /* Write data to DR */
mbed_official 242:7074e42da0b2 412 I2cHandle.Instance->DR = (*data++);
mbed_official 242:7074e42da0b2 413 length--;
mbed_official 242:7074e42da0b2 414 size++;
mbed_official 242:7074e42da0b2 415
mbed_official 242:7074e42da0b2 416 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 242:7074e42da0b2 417 /* Write data to DR */
mbed_official 242:7074e42da0b2 418 I2cHandle.Instance->DR = (*data++);
mbed_official 242:7074e42da0b2 419 length--;
mbed_official 242:7074e42da0b2 420 size++;
mbed_official 242:7074e42da0b2 421 }
mbed_official 133:d4dda5c437f0 422 }
mbed_official 133:d4dda5c437f0 423
mbed_official 242:7074e42da0b2 424 /* Wait until AF flag is set */
mbed_official 242:7074e42da0b2 425 Timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 426 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
mbed_official 242:7074e42da0b2 427 Timeout--;
mbed_official 242:7074e42da0b2 428 if (Timeout == 0) {
mbed_official 242:7074e42da0b2 429 return 0;
mbed_official 242:7074e42da0b2 430 }
mbed_official 242:7074e42da0b2 431 }
mbed_official 242:7074e42da0b2 432
mbed_official 242:7074e42da0b2 433
mbed_official 242:7074e42da0b2 434 /* Clear AF flag */
mbed_official 242:7074e42da0b2 435 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 242:7074e42da0b2 436
mbed_official 242:7074e42da0b2 437
mbed_official 242:7074e42da0b2 438 /* Wait until BUSY flag is reset */
mbed_official 242:7074e42da0b2 439 Timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 440 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 242:7074e42da0b2 441 Timeout--;
mbed_official 242:7074e42da0b2 442 if (Timeout == 0) {
mbed_official 242:7074e42da0b2 443 return 0;
mbed_official 242:7074e42da0b2 444 }
mbed_official 242:7074e42da0b2 445 }
mbed_official 242:7074e42da0b2 446
mbed_official 242:7074e42da0b2 447 I2cHandle.State = HAL_I2C_STATE_READY;
mbed_official 242:7074e42da0b2 448
mbed_official 242:7074e42da0b2 449 /* Process Unlocked */
mbed_official 242:7074e42da0b2 450 __HAL_UNLOCK(&I2cHandle);
mbed_official 242:7074e42da0b2 451
mbed_official 242:7074e42da0b2 452 return size;
mbed_official 133:d4dda5c437f0 453 }
mbed_official 133:d4dda5c437f0 454
mbed_official 133:d4dda5c437f0 455
mbed_official 133:d4dda5c437f0 456 #endif // DEVICE_I2CSLAVE
mbed_official 133:d4dda5c437f0 457
mbed_official 133:d4dda5c437f0 458 #endif // DEVICE_I2C