gabriel della-monica / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_STM32F411RE/i2c_api.c@429:cc5da43e7bf6, 2014-12-09 (annotated)

Committer:
mbed_official
Date:
Tue Dec 09 14:15:07 2014 +0000
Revision:
429:cc5da43e7bf6
Parent:
targets/hal/TARGET_STM/TARGET_NUCLEO_F411RE/i2c_api.c@406:7b834b41c730 
Synchronized with git revision 75673df767b901eda5c6ea6c737b58deb390c955



Full URL: https://github.com/mbedmicro/mbed/commit/75673df767b901eda5c6ea6c737b58deb390c955/



Add support for mDot with STM32F411RE processor

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 235:685d5f11838f 1 /* mbed Microcontroller Library
mbed_official 235:685d5f11838f 2 *******************************************************************************
mbed_official 235:685d5f11838f 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 235:685d5f11838f 4 * All rights reserved.
mbed_official 235:685d5f11838f 5 *
mbed_official 235:685d5f11838f 6 * Redistribution and use in source and binary forms, with or without
mbed_official 235:685d5f11838f 7 * modification, are permitted provided that the following conditions are met:
mbed_official 235:685d5f11838f 8 *
mbed_official 235:685d5f11838f 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 235:685d5f11838f 10 * this list of conditions and the following disclaimer.
mbed_official 235:685d5f11838f 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 235:685d5f11838f 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 235:685d5f11838f 13 * and/or other materials provided with the distribution.
mbed_official 235:685d5f11838f 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 235:685d5f11838f 15 * may be used to endorse or promote products derived from this software
mbed_official 235:685d5f11838f 16 * without specific prior written permission.
mbed_official 235:685d5f11838f 17 *
mbed_official 235:685d5f11838f 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 235:685d5f11838f 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 235:685d5f11838f 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 235:685d5f11838f 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 235:685d5f11838f 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 235:685d5f11838f 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 235:685d5f11838f 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 235:685d5f11838f 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 235:685d5f11838f 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 235:685d5f11838f 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 235:685d5f11838f 28 *******************************************************************************
mbed_official 235:685d5f11838f 29 */
mbed_official 235:685d5f11838f 30 #include "mbed_assert.h"
mbed_official 235:685d5f11838f 31 #include "i2c_api.h"
mbed_official 235:685d5f11838f 32
mbed_official 235:685d5f11838f 33 #if DEVICE_I2C
mbed_official 235:685d5f11838f 34
mbed_official 235:685d5f11838f 35 #include "cmsis.h"
mbed_official 235:685d5f11838f 36 #include "pinmap.h"
mbed_official 406:7b834b41c730 37 #include "PeripheralPins.h"
mbed_official 235:685d5f11838f 38
mbed_official 235:685d5f11838f 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 235:685d5f11838f 40 not based on accurate values, they just guarantee that the application will
mbed_official 235:685d5f11838f 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 235:685d5f11838f 42 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 235:685d5f11838f 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 235:685d5f11838f 44
mbed_official 235:685d5f11838f 45 I2C_HandleTypeDef I2cHandle;
mbed_official 235:685d5f11838f 46
mbed_official 305:1f0269907d8b 47 int i2c1_inited = 0;
mbed_official 305:1f0269907d8b 48 int i2c2_inited = 0;
mbed_official 305:1f0269907d8b 49 int i2c3_inited = 0;
mbed_official 305:1f0269907d8b 50
mbed_official 402:09075a3b15e3 51 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
mbed_official 402:09075a3b15e3 52 {
mbed_official 235:685d5f11838f 53 // Determine the I2C to use
mbed_official 235:685d5f11838f 54 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 235:685d5f11838f 55 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 235:685d5f11838f 56
mbed_official 235:685d5f11838f 57 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 235:685d5f11838f 58 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 235:685d5f11838f 59
mbed_official 305:1f0269907d8b 60 // Enable I2C1 clock and pinout if not done
mbed_official 402:09075a3b15e3 61 if ((obj->i2c == I2C_1) && !i2c1_inited) {
mbed_official 305:1f0269907d8b 62 i2c1_inited = 1;
mbed_official 235:685d5f11838f 63 __I2C1_CLK_ENABLE();
mbed_official 305:1f0269907d8b 64 // Configure I2C pins
mbed_official 305:1f0269907d8b 65 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 66 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 67 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 68 pin_mode(scl, OpenDrain);
mbed_official 235:685d5f11838f 69 }
mbed_official 305:1f0269907d8b 70 // Enable I2C2 clock and pinout if not done
mbed_official 402:09075a3b15e3 71 if ((obj->i2c == I2C_2) && !i2c2_inited) {
mbed_official 305:1f0269907d8b 72 i2c2_inited = 1;
mbed_official 305:1f0269907d8b 73 __I2C2_CLK_ENABLE();
mbed_official 305:1f0269907d8b 74 // Configure I2C pins
mbed_official 305:1f0269907d8b 75 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 76 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 77 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 78 pin_mode(scl, OpenDrain);
mbed_official 235:685d5f11838f 79 }
mbed_official 305:1f0269907d8b 80 // Enable I2C3 clock and pinout if not done
mbed_official 402:09075a3b15e3 81 if ((obj->i2c == I2C_3) && !i2c3_inited) {
mbed_official 305:1f0269907d8b 82 i2c3_inited = 1;
mbed_official 305:1f0269907d8b 83 __I2C3_CLK_ENABLE();
mbed_official 305:1f0269907d8b 84 // Configure I2C pins
mbed_official 305:1f0269907d8b 85 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 86 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 87 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 88 pin_mode(scl, OpenDrain);
mbed_official 305:1f0269907d8b 89 }
mbed_official 235:685d5f11838f 90
mbed_official 235:685d5f11838f 91 // Reset to clear pending flags if any
mbed_official 235:685d5f11838f 92 i2c_reset(obj);
mbed_official 235:685d5f11838f 93
mbed_official 235:685d5f11838f 94 // I2C configuration
mbed_official 235:685d5f11838f 95 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 235:685d5f11838f 96
mbed_official 235:685d5f11838f 97 // I2C master by default
mbed_official 235:685d5f11838f 98 obj->slave = 0;
mbed_official 235:685d5f11838f 99 }
mbed_official 235:685d5f11838f 100
mbed_official 402:09075a3b15e3 101 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 402:09075a3b15e3 102 {
mbed_official 235:685d5f11838f 103 MBED_ASSERT((hz != 0) && (hz <= 400000));
mbed_official 235:685d5f11838f 104 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 305:1f0269907d8b 105 int timeout;
mbed_official 402:09075a3b15e3 106
mbed_official 305:1f0269907d8b 107 // wait before init
mbed_official 305:1f0269907d8b 108 timeout = LONG_TIMEOUT;
mbed_official 402:09075a3b15e3 109 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 235:685d5f11838f 110
mbed_official 235:685d5f11838f 111 // I2C configuration
mbed_official 235:685d5f11838f 112 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 235:685d5f11838f 113 I2cHandle.Init.ClockSpeed = hz;
mbed_official 235:685d5f11838f 114 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 235:685d5f11838f 115 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
mbed_official 235:685d5f11838f 116 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 235:685d5f11838f 117 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 235:685d5f11838f 118 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 235:685d5f11838f 119 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 235:685d5f11838f 120 HAL_I2C_Init(&I2cHandle);
mbed_official 235:685d5f11838f 121 if (obj->slave) {
mbed_official 235:685d5f11838f 122 /* Enable Address Acknowledge */
mbed_official 235:685d5f11838f 123 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 235:685d5f11838f 124 }
mbed_official 235:685d5f11838f 125
mbed_official 235:685d5f11838f 126 }
mbed_official 235:685d5f11838f 127
mbed_official 402:09075a3b15e3 128 inline int i2c_start(i2c_t *obj)
mbed_official 402:09075a3b15e3 129 {
mbed_official 235:685d5f11838f 130 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 131 int timeout;
mbed_official 235:685d5f11838f 132
mbed_official 235:685d5f11838f 133 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 134
mbed_official 235:685d5f11838f 135 // Clear Acknowledge failure flag
mbed_official 235:685d5f11838f 136 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 235:685d5f11838f 137
mbed_official 235:685d5f11838f 138 // Generate the START condition
mbed_official 235:685d5f11838f 139 i2c->CR1 |= I2C_CR1_START;
mbed_official 235:685d5f11838f 140
mbed_official 235:685d5f11838f 141 // Wait the START condition has been correctly sent
mbed_official 235:685d5f11838f 142 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 143 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 235:685d5f11838f 144 if ((timeout--) == 0) {
mbed_official 235:685d5f11838f 145 return 1;
mbed_official 235:685d5f11838f 146 }
mbed_official 235:685d5f11838f 147 }
mbed_official 235:685d5f11838f 148
mbed_official 235:685d5f11838f 149 return 0;
mbed_official 235:685d5f11838f 150 }
mbed_official 235:685d5f11838f 151
mbed_official 402:09075a3b15e3 152 inline int i2c_stop(i2c_t *obj)
mbed_official 402:09075a3b15e3 153 {
mbed_official 235:685d5f11838f 154 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 155
mbed_official 235:685d5f11838f 156 // Generate the STOP condition
mbed_official 235:685d5f11838f 157 i2c->CR1 |= I2C_CR1_STOP;
mbed_official 235:685d5f11838f 158
mbed_official 235:685d5f11838f 159 return 0;
mbed_official 235:685d5f11838f 160 }
mbed_official 235:685d5f11838f 161
mbed_official 402:09075a3b15e3 162 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 402:09075a3b15e3 163 {
mbed_official 235:685d5f11838f 164 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 165 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 166 int timeout;
mbed_official 235:685d5f11838f 167 int count;
mbed_official 235:685d5f11838f 168 int value;
mbed_official 235:685d5f11838f 169
mbed_official 235:685d5f11838f 170 i2c_start(obj);
mbed_official 235:685d5f11838f 171
mbed_official 235:685d5f11838f 172 // Wait until SB flag is set
mbed_official 235:685d5f11838f 173 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 174 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 235:685d5f11838f 175 timeout--;
mbed_official 235:685d5f11838f 176 if (timeout == 0) {
mbed_official 247:135e3186a638 177 return -1;
mbed_official 235:685d5f11838f 178 }
mbed_official 235:685d5f11838f 179 }
mbed_official 235:685d5f11838f 180
mbed_official 235:685d5f11838f 181 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
mbed_official 235:685d5f11838f 182
mbed_official 235:685d5f11838f 183
mbed_official 235:685d5f11838f 184 // Wait address is acknowledged
mbed_official 235:685d5f11838f 185 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 186 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 235:685d5f11838f 187 timeout--;
mbed_official 235:685d5f11838f 188 if (timeout == 0) {
mbed_official 247:135e3186a638 189 return -1;
mbed_official 235:685d5f11838f 190 }
mbed_official 235:685d5f11838f 191 }
mbed_official 235:685d5f11838f 192 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 235:685d5f11838f 193
mbed_official 235:685d5f11838f 194 // Read all bytes except last one
mbed_official 235:685d5f11838f 195 for (count = 0; count < (length - 1); count++) {
mbed_official 235:685d5f11838f 196 value = i2c_byte_read(obj, 0);
mbed_official 235:685d5f11838f 197 data[count] = (char)value;
mbed_official 235:685d5f11838f 198 }
mbed_official 235:685d5f11838f 199
mbed_official 235:685d5f11838f 200 // If not repeated start, send stop.
mbed_official 235:685d5f11838f 201 // Warning: must be done BEFORE the data is read.
mbed_official 235:685d5f11838f 202 if (stop) {
mbed_official 235:685d5f11838f 203 i2c_stop(obj);
mbed_official 235:685d5f11838f 204 }
mbed_official 235:685d5f11838f 205
mbed_official 235:685d5f11838f 206 // Read the last byte
mbed_official 235:685d5f11838f 207 value = i2c_byte_read(obj, 1);
mbed_official 235:685d5f11838f 208 data[count] = (char)value;
mbed_official 235:685d5f11838f 209
mbed_official 235:685d5f11838f 210 return length;
mbed_official 235:685d5f11838f 211 }
mbed_official 235:685d5f11838f 212
mbed_official 402:09075a3b15e3 213 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 402:09075a3b15e3 214 {
mbed_official 235:685d5f11838f 215 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 216 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 217 int timeout;
mbed_official 235:685d5f11838f 218 int count;
mbed_official 235:685d5f11838f 219
mbed_official 235:685d5f11838f 220 i2c_start(obj);
mbed_official 235:685d5f11838f 221
mbed_official 235:685d5f11838f 222 // Wait until SB flag is set
mbed_official 235:685d5f11838f 223 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 224 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 235:685d5f11838f 225 timeout--;
mbed_official 235:685d5f11838f 226 if (timeout == 0) {
mbed_official 247:135e3186a638 227 return -1;
mbed_official 235:685d5f11838f 228 }
mbed_official 235:685d5f11838f 229 }
mbed_official 235:685d5f11838f 230
mbed_official 235:685d5f11838f 231 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
mbed_official 235:685d5f11838f 232
mbed_official 235:685d5f11838f 233
mbed_official 235:685d5f11838f 234 // Wait address is acknowledged
mbed_official 235:685d5f11838f 235 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 236 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 235:685d5f11838f 237 timeout--;
mbed_official 235:685d5f11838f 238 if (timeout == 0) {
mbed_official 247:135e3186a638 239 return -1;
mbed_official 235:685d5f11838f 240 }
mbed_official 235:685d5f11838f 241 }
mbed_official 235:685d5f11838f 242 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 235:685d5f11838f 243
mbed_official 235:685d5f11838f 244 for (count = 0; count < length; count++) {
mbed_official 235:685d5f11838f 245 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 235:685d5f11838f 246 i2c_stop(obj);
mbed_official 247:135e3186a638 247 return -1;
mbed_official 235:685d5f11838f 248 }
mbed_official 235:685d5f11838f 249 }
mbed_official 235:685d5f11838f 250
mbed_official 235:685d5f11838f 251 // If not repeated start, send stop.
mbed_official 235:685d5f11838f 252 if (stop) {
mbed_official 235:685d5f11838f 253 i2c_stop(obj);
mbed_official 235:685d5f11838f 254 }
mbed_official 235:685d5f11838f 255
mbed_official 235:685d5f11838f 256 return count;
mbed_official 235:685d5f11838f 257 }
mbed_official 235:685d5f11838f 258
mbed_official 402:09075a3b15e3 259 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 402:09075a3b15e3 260 {
mbed_official 235:685d5f11838f 261 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 262 int timeout;
mbed_official 235:685d5f11838f 263
mbed_official 235:685d5f11838f 264 if (last) {
mbed_official 235:685d5f11838f 265 // Don't acknowledge the last byte
mbed_official 235:685d5f11838f 266 i2c->CR1 &= ~I2C_CR1_ACK;
mbed_official 235:685d5f11838f 267 } else {
mbed_official 235:685d5f11838f 268 // Acknowledge the byte
mbed_official 235:685d5f11838f 269 i2c->CR1 |= I2C_CR1_ACK;
mbed_official 235:685d5f11838f 270 }
mbed_official 235:685d5f11838f 271
mbed_official 235:685d5f11838f 272 // Wait until the byte is received
mbed_official 235:685d5f11838f 273 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 274 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 235:685d5f11838f 275 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 276 return -1;
mbed_official 235:685d5f11838f 277 }
mbed_official 235:685d5f11838f 278 }
mbed_official 235:685d5f11838f 279
mbed_official 235:685d5f11838f 280 return (int)i2c->DR;
mbed_official 235:685d5f11838f 281 }
mbed_official 235:685d5f11838f 282
mbed_official 402:09075a3b15e3 283 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 402:09075a3b15e3 284 {
mbed_official 235:685d5f11838f 285 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 286 int timeout;
mbed_official 235:685d5f11838f 287
mbed_official 235:685d5f11838f 288 i2c->DR = (uint8_t)data;
mbed_official 235:685d5f11838f 289
mbed_official 235:685d5f11838f 290 // Wait until the byte is transmitted
mbed_official 235:685d5f11838f 291 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 292 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
mbed_official 235:685d5f11838f 293 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
mbed_official 235:685d5f11838f 294 if ((timeout--) == 0) {
mbed_official 235:685d5f11838f 295 return 0;
mbed_official 235:685d5f11838f 296 }
mbed_official 235:685d5f11838f 297 }
mbed_official 235:685d5f11838f 298
mbed_official 235:685d5f11838f 299 return 1;
mbed_official 235:685d5f11838f 300 }
mbed_official 235:685d5f11838f 301
mbed_official 402:09075a3b15e3 302 void i2c_reset(i2c_t *obj)
mbed_official 402:09075a3b15e3 303 {
mbed_official 305:1f0269907d8b 304 int timeout;
mbed_official 402:09075a3b15e3 305
mbed_official 305:1f0269907d8b 306 // wait before reset
mbed_official 305:1f0269907d8b 307 timeout = LONG_TIMEOUT;
mbed_official 402:09075a3b15e3 308 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 305:1f0269907d8b 309
mbed_official 235:685d5f11838f 310 if (obj->i2c == I2C_1) {
mbed_official 235:685d5f11838f 311 __I2C1_FORCE_RESET();
mbed_official 235:685d5f11838f 312 __I2C1_RELEASE_RESET();
mbed_official 235:685d5f11838f 313 }
mbed_official 235:685d5f11838f 314 if (obj->i2c == I2C_2) {
mbed_official 235:685d5f11838f 315 __I2C2_FORCE_RESET();
mbed_official 235:685d5f11838f 316 __I2C2_RELEASE_RESET();
mbed_official 235:685d5f11838f 317 }
mbed_official 235:685d5f11838f 318 if (obj->i2c == I2C_3) {
mbed_official 235:685d5f11838f 319 __I2C3_FORCE_RESET();
mbed_official 235:685d5f11838f 320 __I2C3_RELEASE_RESET();
mbed_official 235:685d5f11838f 321 }
mbed_official 235:685d5f11838f 322 }
mbed_official 235:685d5f11838f 323
mbed_official 235:685d5f11838f 324 #if DEVICE_I2CSLAVE
mbed_official 235:685d5f11838f 325
mbed_official 402:09075a3b15e3 326 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 402:09075a3b15e3 327 {
mbed_official 235:685d5f11838f 328 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 329 uint16_t tmpreg = 0;
mbed_official 235:685d5f11838f 330
mbed_official 235:685d5f11838f 331 // Get the old register value
mbed_official 235:685d5f11838f 332 tmpreg = i2c->OAR1;
mbed_official 235:685d5f11838f 333 // Reset address bits
mbed_official 235:685d5f11838f 334 tmpreg &= 0xFC00;
mbed_official 235:685d5f11838f 335 // Set new address
mbed_official 235:685d5f11838f 336 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 235:685d5f11838f 337 // Store the new register value
mbed_official 235:685d5f11838f 338 i2c->OAR1 = tmpreg;
mbed_official 235:685d5f11838f 339 }
mbed_official 235:685d5f11838f 340
mbed_official 402:09075a3b15e3 341 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 402:09075a3b15e3 342 {
mbed_official 235:685d5f11838f 343 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 344 if (enable_slave) {
mbed_official 235:685d5f11838f 345 obj->slave = 1;
mbed_official 235:685d5f11838f 346 /* Enable Address Acknowledge */
mbed_official 235:685d5f11838f 347 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 235:685d5f11838f 348 }
mbed_official 235:685d5f11838f 349 }
mbed_official 235:685d5f11838f 350
mbed_official 235:685d5f11838f 351 // See I2CSlave.h
mbed_official 235:685d5f11838f 352 #define NoData 0 // the slave has not been addressed
mbed_official 235:685d5f11838f 353 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 235:685d5f11838f 354 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 235:685d5f11838f 355 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 235:685d5f11838f 356
mbed_official 402:09075a3b15e3 357 int i2c_slave_receive(i2c_t *obj)
mbed_official 402:09075a3b15e3 358 {
mbed_official 235:685d5f11838f 359 int retValue = NoData;
mbed_official 235:685d5f11838f 360
mbed_official 235:685d5f11838f 361 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 235:685d5f11838f 362 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 235:685d5f11838f 363 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1)
mbed_official 235:685d5f11838f 364 retValue = ReadAddressed;
mbed_official 235:685d5f11838f 365 else
mbed_official 235:685d5f11838f 366 retValue = WriteAddressed;
mbed_official 235:685d5f11838f 367
mbed_official 235:685d5f11838f 368 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 235:685d5f11838f 369 }
mbed_official 235:685d5f11838f 370 }
mbed_official 235:685d5f11838f 371
mbed_official 235:685d5f11838f 372 return (retValue);
mbed_official 235:685d5f11838f 373 }
mbed_official 235:685d5f11838f 374
mbed_official 402:09075a3b15e3 375 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 402:09075a3b15e3 376 {
mbed_official 235:685d5f11838f 377 uint32_t Timeout;
mbed_official 235:685d5f11838f 378 int size = 0;
mbed_official 235:685d5f11838f 379
mbed_official 235:685d5f11838f 380 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 381
mbed_official 235:685d5f11838f 382 while (length > 0) {
mbed_official 235:685d5f11838f 383 /* Wait until RXNE flag is set */
mbed_official 235:685d5f11838f 384 // Wait until the byte is received
mbed_official 235:685d5f11838f 385 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 386 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 235:685d5f11838f 387 Timeout--;
mbed_official 235:685d5f11838f 388 if (Timeout == 0) {
mbed_official 247:135e3186a638 389 return -1;
mbed_official 235:685d5f11838f 390 }
mbed_official 235:685d5f11838f 391 }
mbed_official 235:685d5f11838f 392
mbed_official 235:685d5f11838f 393 /* Read data from DR */
mbed_official 235:685d5f11838f 394 (*data++) = I2cHandle.Instance->DR;
mbed_official 235:685d5f11838f 395 length--;
mbed_official 235:685d5f11838f 396 size++;
mbed_official 235:685d5f11838f 397
mbed_official 235:685d5f11838f 398 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 235:685d5f11838f 399 /* Read data from DR */
mbed_official 235:685d5f11838f 400 (*data++) = I2cHandle.Instance->DR;
mbed_official 235:685d5f11838f 401 length--;
mbed_official 235:685d5f11838f 402 size++;
mbed_official 235:685d5f11838f 403 }
mbed_official 235:685d5f11838f 404 }
mbed_official 235:685d5f11838f 405
mbed_official 235:685d5f11838f 406 /* Wait until STOP flag is set */
mbed_official 235:685d5f11838f 407 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 408 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 235:685d5f11838f 409 Timeout--;
mbed_official 235:685d5f11838f 410 if (Timeout == 0) {
mbed_official 247:135e3186a638 411 return -1;
mbed_official 235:685d5f11838f 412 }
mbed_official 235:685d5f11838f 413 }
mbed_official 235:685d5f11838f 414
mbed_official 235:685d5f11838f 415 /* Clear STOP flag */
mbed_official 235:685d5f11838f 416 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
mbed_official 235:685d5f11838f 417
mbed_official 235:685d5f11838f 418 /* Wait until BUSY flag is reset */
mbed_official 235:685d5f11838f 419 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 420 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 235:685d5f11838f 421 Timeout--;
mbed_official 235:685d5f11838f 422 if (Timeout == 0) {
mbed_official 247:135e3186a638 423 return -1;
mbed_official 235:685d5f11838f 424 }
mbed_official 235:685d5f11838f 425 }
mbed_official 235:685d5f11838f 426
mbed_official 235:685d5f11838f 427 return size;
mbed_official 235:685d5f11838f 428 }
mbed_official 235:685d5f11838f 429
mbed_official 402:09075a3b15e3 430 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 402:09075a3b15e3 431 {
mbed_official 235:685d5f11838f 432 uint32_t Timeout;
mbed_official 235:685d5f11838f 433 int size = 0;
mbed_official 235:685d5f11838f 434
mbed_official 235:685d5f11838f 435 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 436
mbed_official 235:685d5f11838f 437 while (length > 0) {
mbed_official 235:685d5f11838f 438 /* Wait until TXE flag is set */
mbed_official 235:685d5f11838f 439 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 440 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
mbed_official 235:685d5f11838f 441 Timeout--;
mbed_official 235:685d5f11838f 442 if (Timeout == 0) {
mbed_official 247:135e3186a638 443 return -1;
mbed_official 235:685d5f11838f 444 }
mbed_official 235:685d5f11838f 445 }
mbed_official 235:685d5f11838f 446
mbed_official 235:685d5f11838f 447
mbed_official 235:685d5f11838f 448 /* Write data to DR */
mbed_official 235:685d5f11838f 449 I2cHandle.Instance->DR = (*data++);
mbed_official 235:685d5f11838f 450 length--;
mbed_official 235:685d5f11838f 451 size++;
mbed_official 235:685d5f11838f 452
mbed_official 235:685d5f11838f 453 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 235:685d5f11838f 454 /* Write data to DR */
mbed_official 235:685d5f11838f 455 I2cHandle.Instance->DR = (*data++);
mbed_official 235:685d5f11838f 456 length--;
mbed_official 235:685d5f11838f 457 size++;
mbed_official 235:685d5f11838f 458 }
mbed_official 235:685d5f11838f 459 }
mbed_official 235:685d5f11838f 460
mbed_official 235:685d5f11838f 461 /* Wait until AF flag is set */
mbed_official 235:685d5f11838f 462 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 463 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
mbed_official 235:685d5f11838f 464 Timeout--;
mbed_official 235:685d5f11838f 465 if (Timeout == 0) {
mbed_official 247:135e3186a638 466 return -1;
mbed_official 235:685d5f11838f 467 }
mbed_official 235:685d5f11838f 468 }
mbed_official 235:685d5f11838f 469
mbed_official 235:685d5f11838f 470
mbed_official 235:685d5f11838f 471 /* Clear AF flag */
mbed_official 235:685d5f11838f 472 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 235:685d5f11838f 473
mbed_official 235:685d5f11838f 474
mbed_official 235:685d5f11838f 475 /* Wait until BUSY flag is reset */
mbed_official 235:685d5f11838f 476 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 477 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 235:685d5f11838f 478 Timeout--;
mbed_official 235:685d5f11838f 479 if (Timeout == 0) {
mbed_official 247:135e3186a638 480 return -1;
mbed_official 235:685d5f11838f 481 }
mbed_official 235:685d5f11838f 482 }
mbed_official 235:685d5f11838f 483
mbed_official 235:685d5f11838f 484 I2cHandle.State = HAL_I2C_STATE_READY;
mbed_official 235:685d5f11838f 485
mbed_official 235:685d5f11838f 486 /* Process Unlocked */
mbed_official 235:685d5f11838f 487 __HAL_UNLOCK(&I2cHandle);
mbed_official 235:685d5f11838f 488
mbed_official 235:685d5f11838f 489 return size;
mbed_official 235:685d5f11838f 490 }
mbed_official 235:685d5f11838f 491
mbed_official 235:685d5f11838f 492
mbed_official 235:685d5f11838f 493 #endif // DEVICE_I2CSLAVE
mbed_official 235:685d5f11838f 494
mbed_official 235:685d5f11838f 495 #endif // DEVICE_I2C