Bob Seque / mbed-dev

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targets/hal/TARGET_STM/TARGET_STM32F4/i2c_api.c@12:7ebf5ad709a3, 2015-10-28 (annotated)

Committer:
mbed_official
Date:
Wed Oct 28 13:00:10 2015 +0000
Revision:
12:7ebf5ad709a3
Parent:
0:9b334a45a8ff
Child:
23:ee8ca7052b3c
Synchronized with git revision e7e5893c2045db1eeb19a0a08b6eb3e219db778f



Full URL: https://github.com/mbedmicro/mbed/commit/e7e5893c2045db1eeb19a0a08b6eb3e219db778f/



[STM32F4xx] Remove eventual pending stop bit before start on I2C

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 *******************************************************************************
bogdanm 0:9b334a45a8ff 3 * Copyright (c) 2014, STMicroelectronics
bogdanm 0:9b334a45a8ff 4 * All rights reserved.
bogdanm 0:9b334a45a8ff 5 *
bogdanm 0:9b334a45a8ff 6 * Redistribution and use in source and binary forms, with or without
bogdanm 0:9b334a45a8ff 7 * modification, are permitted provided that the following conditions are met:
bogdanm 0:9b334a45a8ff 8 *
bogdanm 0:9b334a45a8ff 9 * 1. Redistributions of source code must retain the above copyright notice,
bogdanm 0:9b334a45a8ff 10 * this list of conditions and the following disclaimer.
bogdanm 0:9b334a45a8ff 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
bogdanm 0:9b334a45a8ff 12 * this list of conditions and the following disclaimer in the documentation
bogdanm 0:9b334a45a8ff 13 * and/or other materials provided with the distribution.
bogdanm 0:9b334a45a8ff 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
bogdanm 0:9b334a45a8ff 15 * may be used to endorse or promote products derived from this software
bogdanm 0:9b334a45a8ff 16 * without specific prior written permission.
bogdanm 0:9b334a45a8ff 17 *
bogdanm 0:9b334a45a8ff 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
bogdanm 0:9b334a45a8ff 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
bogdanm 0:9b334a45a8ff 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
bogdanm 0:9b334a45a8ff 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
bogdanm 0:9b334a45a8ff 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
bogdanm 0:9b334a45a8ff 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
bogdanm 0:9b334a45a8ff 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
bogdanm 0:9b334a45a8ff 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
bogdanm 0:9b334a45a8ff 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
bogdanm 0:9b334a45a8ff 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
bogdanm 0:9b334a45a8ff 28 *******************************************************************************
bogdanm 0:9b334a45a8ff 29 */
bogdanm 0:9b334a45a8ff 30 #include "mbed_assert.h"
bogdanm 0:9b334a45a8ff 31 #include "i2c_api.h"
bogdanm 0:9b334a45a8ff 32
bogdanm 0:9b334a45a8ff 33 #if DEVICE_I2C
bogdanm 0:9b334a45a8ff 34
bogdanm 0:9b334a45a8ff 35 #include "cmsis.h"
bogdanm 0:9b334a45a8ff 36 #include "pinmap.h"
bogdanm 0:9b334a45a8ff 37 #include "PeripheralPins.h"
bogdanm 0:9b334a45a8ff 38
bogdanm 0:9b334a45a8ff 39 /* Timeout values for flags and events waiting loops. These timeouts are
bogdanm 0:9b334a45a8ff 40 not based on accurate values, they just guarantee that the application will
bogdanm 0:9b334a45a8ff 41 not remain stuck if the I2C communication is corrupted. */
bogdanm 0:9b334a45a8ff 42 #define FLAG_TIMEOUT ((int)0x1000)
bogdanm 0:9b334a45a8ff 43 #define LONG_TIMEOUT ((int)0x8000)
bogdanm 0:9b334a45a8ff 44
bogdanm 0:9b334a45a8ff 45 I2C_HandleTypeDef I2cHandle;
bogdanm 0:9b334a45a8ff 46
bogdanm 0:9b334a45a8ff 47 int i2c1_inited = 0;
bogdanm 0:9b334a45a8ff 48 int i2c2_inited = 0;
bogdanm 0:9b334a45a8ff 49 int i2c3_inited = 0;
bogdanm 0:9b334a45a8ff 50
bogdanm 0:9b334a45a8ff 51 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
bogdanm 0:9b334a45a8ff 52 {
bogdanm 0:9b334a45a8ff 53 // Determine the I2C to use
bogdanm 0:9b334a45a8ff 54 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 55 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 56
bogdanm 0:9b334a45a8ff 57 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
bogdanm 0:9b334a45a8ff 58 MBED_ASSERT(obj->i2c != (I2CName)NC);
bogdanm 0:9b334a45a8ff 59
bogdanm 0:9b334a45a8ff 60 // Enable I2C1 clock and pinout if not done
bogdanm 0:9b334a45a8ff 61 if ((obj->i2c == I2C_1) && !i2c1_inited) {
bogdanm 0:9b334a45a8ff 62 i2c1_inited = 1;
bogdanm 0:9b334a45a8ff 63 __I2C1_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 64 // Configure I2C pins
bogdanm 0:9b334a45a8ff 65 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 66 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 67 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 68 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 69 }
bogdanm 0:9b334a45a8ff 70 // Enable I2C2 clock and pinout if not done
bogdanm 0:9b334a45a8ff 71 if ((obj->i2c == I2C_2) && !i2c2_inited) {
bogdanm 0:9b334a45a8ff 72 i2c2_inited = 1;
bogdanm 0:9b334a45a8ff 73 __I2C2_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 74 // Configure I2C pins
bogdanm 0:9b334a45a8ff 75 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 76 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 77 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 78 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 79 }
bogdanm 0:9b334a45a8ff 80 // Enable I2C3 clock and pinout if not done
bogdanm 0:9b334a45a8ff 81 if ((obj->i2c == I2C_3) && !i2c3_inited) {
bogdanm 0:9b334a45a8ff 82 i2c3_inited = 1;
bogdanm 0:9b334a45a8ff 83 __I2C3_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 84 // Configure I2C pins
bogdanm 0:9b334a45a8ff 85 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 86 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 87 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 88 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 89 }
bogdanm 0:9b334a45a8ff 90
bogdanm 0:9b334a45a8ff 91 // Reset to clear pending flags if any
bogdanm 0:9b334a45a8ff 92 i2c_reset(obj);
bogdanm 0:9b334a45a8ff 93
bogdanm 0:9b334a45a8ff 94 // I2C configuration
bogdanm 0:9b334a45a8ff 95 i2c_frequency(obj, 100000); // 100 kHz per default
bogdanm 0:9b334a45a8ff 96
bogdanm 0:9b334a45a8ff 97 // I2C master by default
bogdanm 0:9b334a45a8ff 98 obj->slave = 0;
bogdanm 0:9b334a45a8ff 99 }
bogdanm 0:9b334a45a8ff 100
bogdanm 0:9b334a45a8ff 101 void i2c_frequency(i2c_t *obj, int hz)
bogdanm 0:9b334a45a8ff 102 {
mbed_official 12:7ebf5ad709a3 103 MBED_ASSERT((hz > 0) && (hz <= 400000));
bogdanm 0:9b334a45a8ff 104 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 105 int timeout;
bogdanm 0:9b334a45a8ff 106
bogdanm 0:9b334a45a8ff 107 // wait before init
bogdanm 0:9b334a45a8ff 108 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 109 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
bogdanm 0:9b334a45a8ff 110
bogdanm 0:9b334a45a8ff 111 // I2C configuration
bogdanm 0:9b334a45a8ff 112 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
bogdanm 0:9b334a45a8ff 113 I2cHandle.Init.ClockSpeed = hz;
bogdanm 0:9b334a45a8ff 114 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
bogdanm 0:9b334a45a8ff 115 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
bogdanm 0:9b334a45a8ff 116 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
bogdanm 0:9b334a45a8ff 117 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
bogdanm 0:9b334a45a8ff 118 I2cHandle.Init.OwnAddress1 = 0;
bogdanm 0:9b334a45a8ff 119 I2cHandle.Init.OwnAddress2 = 0;
bogdanm 0:9b334a45a8ff 120 HAL_I2C_Init(&I2cHandle);
bogdanm 0:9b334a45a8ff 121 if (obj->slave) {
bogdanm 0:9b334a45a8ff 122 /* Enable Address Acknowledge */
bogdanm 0:9b334a45a8ff 123 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
bogdanm 0:9b334a45a8ff 124 }
bogdanm 0:9b334a45a8ff 125
bogdanm 0:9b334a45a8ff 126 }
bogdanm 0:9b334a45a8ff 127
bogdanm 0:9b334a45a8ff 128 inline int i2c_start(i2c_t *obj)
bogdanm 0:9b334a45a8ff 129 {
bogdanm 0:9b334a45a8ff 130 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 131 int timeout;
bogdanm 0:9b334a45a8ff 132
bogdanm 0:9b334a45a8ff 133 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 134
bogdanm 0:9b334a45a8ff 135 // Clear Acknowledge failure flag
bogdanm 0:9b334a45a8ff 136 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
bogdanm 0:9b334a45a8ff 137
mbed_official 12:7ebf5ad709a3 138 // Generate the START condition and remove an eventual pending STOP bit
mbed_official 12:7ebf5ad709a3 139 i2c->CR1 = ((i2c->CR1 & ~I2C_CR1_STOP) | I2C_CR1_START);
bogdanm 0:9b334a45a8ff 140
bogdanm 0:9b334a45a8ff 141 // Wait the START condition has been correctly sent
bogdanm 0:9b334a45a8ff 142 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 143 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
bogdanm 0:9b334a45a8ff 144 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 145 return 1;
bogdanm 0:9b334a45a8ff 146 }
bogdanm 0:9b334a45a8ff 147 }
bogdanm 0:9b334a45a8ff 148
bogdanm 0:9b334a45a8ff 149 return 0;
bogdanm 0:9b334a45a8ff 150 }
bogdanm 0:9b334a45a8ff 151
bogdanm 0:9b334a45a8ff 152 inline int i2c_stop(i2c_t *obj)
bogdanm 0:9b334a45a8ff 153 {
bogdanm 0:9b334a45a8ff 154 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 155
bogdanm 0:9b334a45a8ff 156 // Generate the STOP condition
bogdanm 0:9b334a45a8ff 157 i2c->CR1 |= I2C_CR1_STOP;
bogdanm 0:9b334a45a8ff 158
bogdanm 0:9b334a45a8ff 159 return 0;
bogdanm 0:9b334a45a8ff 160 }
bogdanm 0:9b334a45a8ff 161
bogdanm 0:9b334a45a8ff 162 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
bogdanm 0:9b334a45a8ff 163 {
bogdanm 0:9b334a45a8ff 164 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 165 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 166 int timeout;
bogdanm 0:9b334a45a8ff 167 int count;
bogdanm 0:9b334a45a8ff 168 int value;
bogdanm 0:9b334a45a8ff 169
bogdanm 0:9b334a45a8ff 170 i2c_start(obj);
bogdanm 0:9b334a45a8ff 171
bogdanm 0:9b334a45a8ff 172 // Wait until SB flag is set
bogdanm 0:9b334a45a8ff 173 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 174 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
bogdanm 0:9b334a45a8ff 175 timeout--;
bogdanm 0:9b334a45a8ff 176 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 177 return -1;
bogdanm 0:9b334a45a8ff 178 }
bogdanm 0:9b334a45a8ff 179 }
bogdanm 0:9b334a45a8ff 180
bogdanm 0:9b334a45a8ff 181 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
bogdanm 0:9b334a45a8ff 182
bogdanm 0:9b334a45a8ff 183
bogdanm 0:9b334a45a8ff 184 // Wait address is acknowledged
bogdanm 0:9b334a45a8ff 185 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 186 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
bogdanm 0:9b334a45a8ff 187 timeout--;
bogdanm 0:9b334a45a8ff 188 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 189 return -1;
bogdanm 0:9b334a45a8ff 190 }
bogdanm 0:9b334a45a8ff 191 }
bogdanm 0:9b334a45a8ff 192 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
bogdanm 0:9b334a45a8ff 193
bogdanm 0:9b334a45a8ff 194 // Read all bytes except last one
bogdanm 0:9b334a45a8ff 195 for (count = 0; count < (length - 1); count++) {
bogdanm 0:9b334a45a8ff 196 value = i2c_byte_read(obj, 0);
bogdanm 0:9b334a45a8ff 197 data[count] = (char)value;
bogdanm 0:9b334a45a8ff 198 }
bogdanm 0:9b334a45a8ff 199
bogdanm 0:9b334a45a8ff 200 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 201 // Warning: must be done BEFORE the data is read.
bogdanm 0:9b334a45a8ff 202 if (stop) {
bogdanm 0:9b334a45a8ff 203 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 204 }
bogdanm 0:9b334a45a8ff 205
bogdanm 0:9b334a45a8ff 206 // Read the last byte
bogdanm 0:9b334a45a8ff 207 value = i2c_byte_read(obj, 1);
bogdanm 0:9b334a45a8ff 208 data[count] = (char)value;
bogdanm 0:9b334a45a8ff 209
bogdanm 0:9b334a45a8ff 210 return length;
bogdanm 0:9b334a45a8ff 211 }
bogdanm 0:9b334a45a8ff 212
bogdanm 0:9b334a45a8ff 213 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
bogdanm 0:9b334a45a8ff 214 {
bogdanm 0:9b334a45a8ff 215 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 216 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 217 int timeout;
bogdanm 0:9b334a45a8ff 218 int count;
bogdanm 0:9b334a45a8ff 219
bogdanm 0:9b334a45a8ff 220 i2c_start(obj);
bogdanm 0:9b334a45a8ff 221
bogdanm 0:9b334a45a8ff 222 // Wait until SB flag is set
bogdanm 0:9b334a45a8ff 223 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 224 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
bogdanm 0:9b334a45a8ff 225 timeout--;
bogdanm 0:9b334a45a8ff 226 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 227 return -1;
bogdanm 0:9b334a45a8ff 228 }
bogdanm 0:9b334a45a8ff 229 }
bogdanm 0:9b334a45a8ff 230
bogdanm 0:9b334a45a8ff 231 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
bogdanm 0:9b334a45a8ff 232
bogdanm 0:9b334a45a8ff 233
bogdanm 0:9b334a45a8ff 234 // Wait address is acknowledged
bogdanm 0:9b334a45a8ff 235 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 236 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
bogdanm 0:9b334a45a8ff 237 timeout--;
bogdanm 0:9b334a45a8ff 238 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 239 return -1;
bogdanm 0:9b334a45a8ff 240 }
bogdanm 0:9b334a45a8ff 241 }
bogdanm 0:9b334a45a8ff 242 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
bogdanm 0:9b334a45a8ff 243
bogdanm 0:9b334a45a8ff 244 for (count = 0; count < length; count++) {
bogdanm 0:9b334a45a8ff 245 if (i2c_byte_write(obj, data[count]) != 1) {
bogdanm 0:9b334a45a8ff 246 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 247 return -1;
bogdanm 0:9b334a45a8ff 248 }
bogdanm 0:9b334a45a8ff 249 }
bogdanm 0:9b334a45a8ff 250
bogdanm 0:9b334a45a8ff 251 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 252 if (stop) {
bogdanm 0:9b334a45a8ff 253 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 254 }
bogdanm 0:9b334a45a8ff 255
bogdanm 0:9b334a45a8ff 256 return count;
bogdanm 0:9b334a45a8ff 257 }
bogdanm 0:9b334a45a8ff 258
bogdanm 0:9b334a45a8ff 259 int i2c_byte_read(i2c_t *obj, int last)
bogdanm 0:9b334a45a8ff 260 {
bogdanm 0:9b334a45a8ff 261 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 262 int timeout;
bogdanm 0:9b334a45a8ff 263
bogdanm 0:9b334a45a8ff 264 if (last) {
bogdanm 0:9b334a45a8ff 265 // Don't acknowledge the last byte
bogdanm 0:9b334a45a8ff 266 i2c->CR1 &= ~I2C_CR1_ACK;
bogdanm 0:9b334a45a8ff 267 } else {
bogdanm 0:9b334a45a8ff 268 // Acknowledge the byte
bogdanm 0:9b334a45a8ff 269 i2c->CR1 |= I2C_CR1_ACK;
bogdanm 0:9b334a45a8ff 270 }
bogdanm 0:9b334a45a8ff 271
bogdanm 0:9b334a45a8ff 272 // Wait until the byte is received
bogdanm 0:9b334a45a8ff 273 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 274 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
bogdanm 0:9b334a45a8ff 275 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 276 return -1;
bogdanm 0:9b334a45a8ff 277 }
bogdanm 0:9b334a45a8ff 278 }
bogdanm 0:9b334a45a8ff 279
bogdanm 0:9b334a45a8ff 280 return (int)i2c->DR;
bogdanm 0:9b334a45a8ff 281 }
bogdanm 0:9b334a45a8ff 282
bogdanm 0:9b334a45a8ff 283 int i2c_byte_write(i2c_t *obj, int data)
bogdanm 0:9b334a45a8ff 284 {
bogdanm 0:9b334a45a8ff 285 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 286 int timeout;
bogdanm 0:9b334a45a8ff 287
bogdanm 0:9b334a45a8ff 288 i2c->DR = (uint8_t)data;
bogdanm 0:9b334a45a8ff 289
bogdanm 0:9b334a45a8ff 290 // Wait until the byte is transmitted
bogdanm 0:9b334a45a8ff 291 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 292 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
bogdanm 0:9b334a45a8ff 293 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
bogdanm 0:9b334a45a8ff 294 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 295 return 0;
bogdanm 0:9b334a45a8ff 296 }
bogdanm 0:9b334a45a8ff 297 }
bogdanm 0:9b334a45a8ff 298
bogdanm 0:9b334a45a8ff 299 return 1;
bogdanm 0:9b334a45a8ff 300 }
bogdanm 0:9b334a45a8ff 301
bogdanm 0:9b334a45a8ff 302 void i2c_reset(i2c_t *obj)
bogdanm 0:9b334a45a8ff 303 {
bogdanm 0:9b334a45a8ff 304 int timeout;
bogdanm 0:9b334a45a8ff 305
bogdanm 0:9b334a45a8ff 306 // wait before reset
bogdanm 0:9b334a45a8ff 307 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 308 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
bogdanm 0:9b334a45a8ff 309
bogdanm 0:9b334a45a8ff 310 if (obj->i2c == I2C_1) {
bogdanm 0:9b334a45a8ff 311 __I2C1_FORCE_RESET();
bogdanm 0:9b334a45a8ff 312 __I2C1_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 313 }
bogdanm 0:9b334a45a8ff 314 if (obj->i2c == I2C_2) {
bogdanm 0:9b334a45a8ff 315 __I2C2_FORCE_RESET();
bogdanm 0:9b334a45a8ff 316 __I2C2_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 317 }
bogdanm 0:9b334a45a8ff 318 if (obj->i2c == I2C_3) {
bogdanm 0:9b334a45a8ff 319 __I2C3_FORCE_RESET();
bogdanm 0:9b334a45a8ff 320 __I2C3_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 321 }
bogdanm 0:9b334a45a8ff 322 }
bogdanm 0:9b334a45a8ff 323
bogdanm 0:9b334a45a8ff 324 #if DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 325
bogdanm 0:9b334a45a8ff 326 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
bogdanm 0:9b334a45a8ff 327 {
bogdanm 0:9b334a45a8ff 328 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 329 uint16_t tmpreg = 0;
bogdanm 0:9b334a45a8ff 330
bogdanm 0:9b334a45a8ff 331 // Get the old register value
bogdanm 0:9b334a45a8ff 332 tmpreg = i2c->OAR1;
bogdanm 0:9b334a45a8ff 333 // Reset address bits
bogdanm 0:9b334a45a8ff 334 tmpreg &= 0xFC00;
bogdanm 0:9b334a45a8ff 335 // Set new address
bogdanm 0:9b334a45a8ff 336 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
bogdanm 0:9b334a45a8ff 337 // Store the new register value
bogdanm 0:9b334a45a8ff 338 i2c->OAR1 = tmpreg;
bogdanm 0:9b334a45a8ff 339 }
bogdanm 0:9b334a45a8ff 340
bogdanm 0:9b334a45a8ff 341 void i2c_slave_mode(i2c_t *obj, int enable_slave)
bogdanm 0:9b334a45a8ff 342 {
bogdanm 0:9b334a45a8ff 343 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 344 if (enable_slave) {
bogdanm 0:9b334a45a8ff 345 obj->slave = 1;
bogdanm 0:9b334a45a8ff 346 /* Enable Address Acknowledge */
bogdanm 0:9b334a45a8ff 347 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
bogdanm 0:9b334a45a8ff 348 }
bogdanm 0:9b334a45a8ff 349 }
bogdanm 0:9b334a45a8ff 350
bogdanm 0:9b334a45a8ff 351 // See I2CSlave.h
bogdanm 0:9b334a45a8ff 352 #define NoData 0 // the slave has not been addressed
bogdanm 0:9b334a45a8ff 353 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
bogdanm 0:9b334a45a8ff 354 #define WriteGeneral 2 // the master is writing to all slave
bogdanm 0:9b334a45a8ff 355 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
bogdanm 0:9b334a45a8ff 356
bogdanm 0:9b334a45a8ff 357 int i2c_slave_receive(i2c_t *obj)
bogdanm 0:9b334a45a8ff 358 {
bogdanm 0:9b334a45a8ff 359 int retValue = NoData;
bogdanm 0:9b334a45a8ff 360
bogdanm 0:9b334a45a8ff 361 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
bogdanm 0:9b334a45a8ff 362 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
bogdanm 0:9b334a45a8ff 363 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1)
bogdanm 0:9b334a45a8ff 364 retValue = ReadAddressed;
bogdanm 0:9b334a45a8ff 365 else
bogdanm 0:9b334a45a8ff 366 retValue = WriteAddressed;
bogdanm 0:9b334a45a8ff 367
bogdanm 0:9b334a45a8ff 368 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
bogdanm 0:9b334a45a8ff 369 }
bogdanm 0:9b334a45a8ff 370 }
bogdanm 0:9b334a45a8ff 371
bogdanm 0:9b334a45a8ff 372 return (retValue);
bogdanm 0:9b334a45a8ff 373 }
bogdanm 0:9b334a45a8ff 374
bogdanm 0:9b334a45a8ff 375 int i2c_slave_read(i2c_t *obj, char *data, int length)
bogdanm 0:9b334a45a8ff 376 {
bogdanm 0:9b334a45a8ff 377 uint32_t Timeout;
bogdanm 0:9b334a45a8ff 378 int size = 0;
bogdanm 0:9b334a45a8ff 379
bogdanm 0:9b334a45a8ff 380 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 381
bogdanm 0:9b334a45a8ff 382 while (length > 0) {
bogdanm 0:9b334a45a8ff 383 /* Wait until RXNE flag is set */
bogdanm 0:9b334a45a8ff 384 // Wait until the byte is received
bogdanm 0:9b334a45a8ff 385 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 386 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
bogdanm 0:9b334a45a8ff 387 Timeout--;
bogdanm 0:9b334a45a8ff 388 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 389 return -1;
bogdanm 0:9b334a45a8ff 390 }
bogdanm 0:9b334a45a8ff 391 }
bogdanm 0:9b334a45a8ff 392
bogdanm 0:9b334a45a8ff 393 /* Read data from DR */
bogdanm 0:9b334a45a8ff 394 (*data++) = I2cHandle.Instance->DR;
bogdanm 0:9b334a45a8ff 395 length--;
bogdanm 0:9b334a45a8ff 396 size++;
bogdanm 0:9b334a45a8ff 397
bogdanm 0:9b334a45a8ff 398 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
bogdanm 0:9b334a45a8ff 399 /* Read data from DR */
bogdanm 0:9b334a45a8ff 400 (*data++) = I2cHandle.Instance->DR;
bogdanm 0:9b334a45a8ff 401 length--;
bogdanm 0:9b334a45a8ff 402 size++;
bogdanm 0:9b334a45a8ff 403 }
bogdanm 0:9b334a45a8ff 404 }
bogdanm 0:9b334a45a8ff 405
bogdanm 0:9b334a45a8ff 406 /* Wait until STOP flag is set */
bogdanm 0:9b334a45a8ff 407 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 408 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
bogdanm 0:9b334a45a8ff 409 Timeout--;
bogdanm 0:9b334a45a8ff 410 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 411 return -1;
bogdanm 0:9b334a45a8ff 412 }
bogdanm 0:9b334a45a8ff 413 }
bogdanm 0:9b334a45a8ff 414
bogdanm 0:9b334a45a8ff 415 /* Clear STOP flag */
bogdanm 0:9b334a45a8ff 416 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
bogdanm 0:9b334a45a8ff 417
bogdanm 0:9b334a45a8ff 418 /* Wait until BUSY flag is reset */
bogdanm 0:9b334a45a8ff 419 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 420 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
bogdanm 0:9b334a45a8ff 421 Timeout--;
bogdanm 0:9b334a45a8ff 422 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 423 return -1;
bogdanm 0:9b334a45a8ff 424 }
bogdanm 0:9b334a45a8ff 425 }
bogdanm 0:9b334a45a8ff 426
bogdanm 0:9b334a45a8ff 427 return size;
bogdanm 0:9b334a45a8ff 428 }
bogdanm 0:9b334a45a8ff 429
bogdanm 0:9b334a45a8ff 430 int i2c_slave_write(i2c_t *obj, const char *data, int length)
bogdanm 0:9b334a45a8ff 431 {
bogdanm 0:9b334a45a8ff 432 uint32_t Timeout;
bogdanm 0:9b334a45a8ff 433 int size = 0;
bogdanm 0:9b334a45a8ff 434
bogdanm 0:9b334a45a8ff 435 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 436
bogdanm 0:9b334a45a8ff 437 while (length > 0) {
bogdanm 0:9b334a45a8ff 438 /* Wait until TXE flag is set */
bogdanm 0:9b334a45a8ff 439 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 440 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
bogdanm 0:9b334a45a8ff 441 Timeout--;
bogdanm 0:9b334a45a8ff 442 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 443 return -1;
bogdanm 0:9b334a45a8ff 444 }
bogdanm 0:9b334a45a8ff 445 }
bogdanm 0:9b334a45a8ff 446
bogdanm 0:9b334a45a8ff 447
bogdanm 0:9b334a45a8ff 448 /* Write data to DR */
bogdanm 0:9b334a45a8ff 449 I2cHandle.Instance->DR = (*data++);
bogdanm 0:9b334a45a8ff 450 length--;
bogdanm 0:9b334a45a8ff 451 size++;
bogdanm 0:9b334a45a8ff 452
bogdanm 0:9b334a45a8ff 453 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
bogdanm 0:9b334a45a8ff 454 /* Write data to DR */
bogdanm 0:9b334a45a8ff 455 I2cHandle.Instance->DR = (*data++);
bogdanm 0:9b334a45a8ff 456 length--;
bogdanm 0:9b334a45a8ff 457 size++;
bogdanm 0:9b334a45a8ff 458 }
bogdanm 0:9b334a45a8ff 459 }
bogdanm 0:9b334a45a8ff 460
bogdanm 0:9b334a45a8ff 461 /* Wait until AF flag is set */
bogdanm 0:9b334a45a8ff 462 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 463 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
bogdanm 0:9b334a45a8ff 464 Timeout--;
bogdanm 0:9b334a45a8ff 465 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 466 return -1;
bogdanm 0:9b334a45a8ff 467 }
bogdanm 0:9b334a45a8ff 468 }
bogdanm 0:9b334a45a8ff 469
bogdanm 0:9b334a45a8ff 470
bogdanm 0:9b334a45a8ff 471 /* Clear AF flag */
bogdanm 0:9b334a45a8ff 472 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
bogdanm 0:9b334a45a8ff 473
bogdanm 0:9b334a45a8ff 474
bogdanm 0:9b334a45a8ff 475 /* Wait until BUSY flag is reset */
bogdanm 0:9b334a45a8ff 476 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 477 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
bogdanm 0:9b334a45a8ff 478 Timeout--;
bogdanm 0:9b334a45a8ff 479 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 480 return -1;
bogdanm 0:9b334a45a8ff 481 }
bogdanm 0:9b334a45a8ff 482 }
bogdanm 0:9b334a45a8ff 483
bogdanm 0:9b334a45a8ff 484 I2cHandle.State = HAL_I2C_STATE_READY;
bogdanm 0:9b334a45a8ff 485
bogdanm 0:9b334a45a8ff 486 /* Process Unlocked */
bogdanm 0:9b334a45a8ff 487 __HAL_UNLOCK(&I2cHandle);
bogdanm 0:9b334a45a8ff 488
bogdanm 0:9b334a45a8ff 489 return size;
bogdanm 0:9b334a45a8ff 490 }
bogdanm 0:9b334a45a8ff 491
bogdanm 0:9b334a45a8ff 492
bogdanm 0:9b334a45a8ff 493 #endif // DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 494
bogdanm 0:9b334a45a8ff 495 #endif // DEVICE_I2C