Johannes Stratmann / mbed-dev

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targets/hal/TARGET_STM/TARGET_STM32F4/i2c_api.c@34:bb6061527455, 2015-12-07 (annotated)

Committer:
mbed_official
Date:
Mon Dec 07 08:00:11 2015 +0000
Revision:
34:bb6061527455
Parent:
25:ac5b0a371348
Child:
144:ef7eb2e8f9f7
Synchronized with git revision a41d1d6c02719cd8c7829637b5ae1832821b578f



Full URL: https://github.com/mbedmicro/mbed/commit/a41d1d6c02719cd8c7829637b5ae1832821b578f/



I2C fixes, timeout for startup ~100/200

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 *******************************************************************************
mbed_official 23:ee8ca7052b3c 3 * Copyright (c) 2015, 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;
mbed_official 25:ac5b0a371348 50 int fmpi2c1_inited = 0;
bogdanm 0:9b334a45a8ff 51
bogdanm 0:9b334a45a8ff 52 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
bogdanm 0:9b334a45a8ff 53 {
bogdanm 0:9b334a45a8ff 54 // Determine the I2C to use
bogdanm 0:9b334a45a8ff 55 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 56 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 57
bogdanm 0:9b334a45a8ff 58 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
bogdanm 0:9b334a45a8ff 59 MBED_ASSERT(obj->i2c != (I2CName)NC);
bogdanm 0:9b334a45a8ff 60
bogdanm 0:9b334a45a8ff 61 // Enable I2C1 clock and pinout if not done
bogdanm 0:9b334a45a8ff 62 if ((obj->i2c == I2C_1) && !i2c1_inited) {
bogdanm 0:9b334a45a8ff 63 i2c1_inited = 1;
bogdanm 0:9b334a45a8ff 64 __I2C1_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 65 // Configure I2C pins
bogdanm 0:9b334a45a8ff 66 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 67 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 68 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 69 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 70 }
bogdanm 0:9b334a45a8ff 71 // Enable I2C2 clock and pinout if not done
bogdanm 0:9b334a45a8ff 72 if ((obj->i2c == I2C_2) && !i2c2_inited) {
bogdanm 0:9b334a45a8ff 73 i2c2_inited = 1;
bogdanm 0:9b334a45a8ff 74 __I2C2_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 75 // Configure I2C pins
bogdanm 0:9b334a45a8ff 76 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 77 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 78 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 79 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 80 }
mbed_official 25:ac5b0a371348 81 #if defined I2C3_BASE
bogdanm 0:9b334a45a8ff 82 // Enable I2C3 clock and pinout if not done
bogdanm 0:9b334a45a8ff 83 if ((obj->i2c == I2C_3) && !i2c3_inited) {
bogdanm 0:9b334a45a8ff 84 i2c3_inited = 1;
bogdanm 0:9b334a45a8ff 85 __I2C3_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 86 // Configure I2C pins
bogdanm 0:9b334a45a8ff 87 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 88 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 89 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 90 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 91 }
mbed_official 25:ac5b0a371348 92 #endif
mbed_official 25:ac5b0a371348 93
mbed_official 25:ac5b0a371348 94 #if defined FMPI2C1_BASE
mbed_official 25:ac5b0a371348 95 // Enable I2C3 clock and pinout if not done
mbed_official 25:ac5b0a371348 96 if ((obj->i2c == FMPI2C_1) && !fmpi2c1_inited) {
mbed_official 25:ac5b0a371348 97 fmpi2c1_inited = 1;
mbed_official 25:ac5b0a371348 98 __HAL_RCC_FMPI2C1_CLK_ENABLE();
mbed_official 25:ac5b0a371348 99 // Configure I2C pins
mbed_official 25:ac5b0a371348 100 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 25:ac5b0a371348 101 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 25:ac5b0a371348 102 pin_mode(sda, OpenDrain);
mbed_official 25:ac5b0a371348 103 pin_mode(scl, OpenDrain);
mbed_official 25:ac5b0a371348 104 }
mbed_official 25:ac5b0a371348 105 #endif
bogdanm 0:9b334a45a8ff 106
bogdanm 0:9b334a45a8ff 107 // Reset to clear pending flags if any
bogdanm 0:9b334a45a8ff 108 i2c_reset(obj);
bogdanm 0:9b334a45a8ff 109
bogdanm 0:9b334a45a8ff 110 // I2C configuration
bogdanm 0:9b334a45a8ff 111 i2c_frequency(obj, 100000); // 100 kHz per default
bogdanm 0:9b334a45a8ff 112
bogdanm 0:9b334a45a8ff 113 // I2C master by default
bogdanm 0:9b334a45a8ff 114 obj->slave = 0;
bogdanm 0:9b334a45a8ff 115 }
bogdanm 0:9b334a45a8ff 116
bogdanm 0:9b334a45a8ff 117 void i2c_frequency(i2c_t *obj, int hz)
bogdanm 0:9b334a45a8ff 118 {
mbed_official 12:7ebf5ad709a3 119 MBED_ASSERT((hz > 0) && (hz <= 400000));
bogdanm 0:9b334a45a8ff 120 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 121 int timeout;
bogdanm 0:9b334a45a8ff 122
bogdanm 0:9b334a45a8ff 123 // wait before init
bogdanm 0:9b334a45a8ff 124 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 125 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
bogdanm 0:9b334a45a8ff 126
bogdanm 0:9b334a45a8ff 127 // I2C configuration
bogdanm 0:9b334a45a8ff 128 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
bogdanm 0:9b334a45a8ff 129 I2cHandle.Init.ClockSpeed = hz;
bogdanm 0:9b334a45a8ff 130 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
bogdanm 0:9b334a45a8ff 131 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
bogdanm 0:9b334a45a8ff 132 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
bogdanm 0:9b334a45a8ff 133 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
bogdanm 0:9b334a45a8ff 134 I2cHandle.Init.OwnAddress1 = 0;
bogdanm 0:9b334a45a8ff 135 I2cHandle.Init.OwnAddress2 = 0;
bogdanm 0:9b334a45a8ff 136 HAL_I2C_Init(&I2cHandle);
bogdanm 0:9b334a45a8ff 137 if (obj->slave) {
bogdanm 0:9b334a45a8ff 138 /* Enable Address Acknowledge */
bogdanm 0:9b334a45a8ff 139 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
bogdanm 0:9b334a45a8ff 140 }
bogdanm 0:9b334a45a8ff 141
bogdanm 0:9b334a45a8ff 142 }
bogdanm 0:9b334a45a8ff 143
bogdanm 0:9b334a45a8ff 144 inline int i2c_start(i2c_t *obj)
bogdanm 0:9b334a45a8ff 145 {
bogdanm 0:9b334a45a8ff 146 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 147 int timeout;
bogdanm 0:9b334a45a8ff 148
bogdanm 0:9b334a45a8ff 149 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 150
bogdanm 0:9b334a45a8ff 151 // Clear Acknowledge failure flag
bogdanm 0:9b334a45a8ff 152 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
bogdanm 0:9b334a45a8ff 153
mbed_official 34:bb6061527455 154 // Wait the STOP condition has been previously correctly sent
mbed_official 34:bb6061527455 155 // This timeout can be avoid in some specific cases by simply clearing the STOP bit
mbed_official 34:bb6061527455 156 timeout = FLAG_TIMEOUT;
mbed_official 34:bb6061527455 157 while ((i2c->CR1 & I2C_CR1_STOP) == I2C_CR1_STOP) {
mbed_official 34:bb6061527455 158 if ((timeout--) == 0) {
mbed_official 34:bb6061527455 159 return 1;
mbed_official 34:bb6061527455 160 }
mbed_official 34:bb6061527455 161 }
mbed_official 34:bb6061527455 162
mbed_official 34:bb6061527455 163 // Generate the START condition
mbed_official 34:bb6061527455 164 i2c->CR1 |= I2C_CR1_START;
bogdanm 0:9b334a45a8ff 165
bogdanm 0:9b334a45a8ff 166 // Wait the START condition has been correctly sent
bogdanm 0:9b334a45a8ff 167 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 168 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
bogdanm 0:9b334a45a8ff 169 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 170 return 1;
bogdanm 0:9b334a45a8ff 171 }
bogdanm 0:9b334a45a8ff 172 }
bogdanm 0:9b334a45a8ff 173
bogdanm 0:9b334a45a8ff 174 return 0;
bogdanm 0:9b334a45a8ff 175 }
bogdanm 0:9b334a45a8ff 176
bogdanm 0:9b334a45a8ff 177 inline int i2c_stop(i2c_t *obj)
bogdanm 0:9b334a45a8ff 178 {
bogdanm 0:9b334a45a8ff 179 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 180
bogdanm 0:9b334a45a8ff 181 // Generate the STOP condition
bogdanm 0:9b334a45a8ff 182 i2c->CR1 |= I2C_CR1_STOP;
bogdanm 0:9b334a45a8ff 183
bogdanm 0:9b334a45a8ff 184 return 0;
bogdanm 0:9b334a45a8ff 185 }
bogdanm 0:9b334a45a8ff 186
bogdanm 0:9b334a45a8ff 187 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
bogdanm 0:9b334a45a8ff 188 {
bogdanm 0:9b334a45a8ff 189 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 190 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 191 int timeout;
bogdanm 0:9b334a45a8ff 192 int count;
bogdanm 0:9b334a45a8ff 193 int value;
bogdanm 0:9b334a45a8ff 194
bogdanm 0:9b334a45a8ff 195 i2c_start(obj);
bogdanm 0:9b334a45a8ff 196
bogdanm 0:9b334a45a8ff 197 // Wait until SB flag is set
bogdanm 0:9b334a45a8ff 198 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 199 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
bogdanm 0:9b334a45a8ff 200 timeout--;
bogdanm 0:9b334a45a8ff 201 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 202 return -1;
bogdanm 0:9b334a45a8ff 203 }
bogdanm 0:9b334a45a8ff 204 }
bogdanm 0:9b334a45a8ff 205
bogdanm 0:9b334a45a8ff 206 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
bogdanm 0:9b334a45a8ff 207
bogdanm 0:9b334a45a8ff 208
bogdanm 0:9b334a45a8ff 209 // Wait address is acknowledged
bogdanm 0:9b334a45a8ff 210 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 211 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
bogdanm 0:9b334a45a8ff 212 timeout--;
bogdanm 0:9b334a45a8ff 213 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 214 return -1;
bogdanm 0:9b334a45a8ff 215 }
bogdanm 0:9b334a45a8ff 216 }
bogdanm 0:9b334a45a8ff 217 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
bogdanm 0:9b334a45a8ff 218
bogdanm 0:9b334a45a8ff 219 // Read all bytes except last one
bogdanm 0:9b334a45a8ff 220 for (count = 0; count < (length - 1); count++) {
bogdanm 0:9b334a45a8ff 221 value = i2c_byte_read(obj, 0);
bogdanm 0:9b334a45a8ff 222 data[count] = (char)value;
bogdanm 0:9b334a45a8ff 223 }
bogdanm 0:9b334a45a8ff 224
bogdanm 0:9b334a45a8ff 225 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 226 // Warning: must be done BEFORE the data is read.
bogdanm 0:9b334a45a8ff 227 if (stop) {
bogdanm 0:9b334a45a8ff 228 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 229 }
bogdanm 0:9b334a45a8ff 230
bogdanm 0:9b334a45a8ff 231 // Read the last byte
bogdanm 0:9b334a45a8ff 232 value = i2c_byte_read(obj, 1);
bogdanm 0:9b334a45a8ff 233 data[count] = (char)value;
bogdanm 0:9b334a45a8ff 234
bogdanm 0:9b334a45a8ff 235 return length;
bogdanm 0:9b334a45a8ff 236 }
bogdanm 0:9b334a45a8ff 237
bogdanm 0:9b334a45a8ff 238 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
bogdanm 0:9b334a45a8ff 239 {
bogdanm 0:9b334a45a8ff 240 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 241 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 242 int timeout;
bogdanm 0:9b334a45a8ff 243 int count;
bogdanm 0:9b334a45a8ff 244
bogdanm 0:9b334a45a8ff 245 i2c_start(obj);
bogdanm 0:9b334a45a8ff 246
bogdanm 0:9b334a45a8ff 247 // Wait until SB flag is set
bogdanm 0:9b334a45a8ff 248 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 249 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
bogdanm 0:9b334a45a8ff 250 timeout--;
bogdanm 0:9b334a45a8ff 251 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 252 return -1;
bogdanm 0:9b334a45a8ff 253 }
bogdanm 0:9b334a45a8ff 254 }
bogdanm 0:9b334a45a8ff 255
bogdanm 0:9b334a45a8ff 256 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
bogdanm 0:9b334a45a8ff 257
bogdanm 0:9b334a45a8ff 258
bogdanm 0:9b334a45a8ff 259 // Wait address is acknowledged
bogdanm 0:9b334a45a8ff 260 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 261 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
bogdanm 0:9b334a45a8ff 262 timeout--;
bogdanm 0:9b334a45a8ff 263 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 264 return -1;
bogdanm 0:9b334a45a8ff 265 }
bogdanm 0:9b334a45a8ff 266 }
bogdanm 0:9b334a45a8ff 267 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
bogdanm 0:9b334a45a8ff 268
bogdanm 0:9b334a45a8ff 269 for (count = 0; count < length; count++) {
bogdanm 0:9b334a45a8ff 270 if (i2c_byte_write(obj, data[count]) != 1) {
bogdanm 0:9b334a45a8ff 271 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 272 return -1;
bogdanm 0:9b334a45a8ff 273 }
bogdanm 0:9b334a45a8ff 274 }
bogdanm 0:9b334a45a8ff 275
bogdanm 0:9b334a45a8ff 276 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 277 if (stop) {
bogdanm 0:9b334a45a8ff 278 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 279 }
bogdanm 0:9b334a45a8ff 280
bogdanm 0:9b334a45a8ff 281 return count;
bogdanm 0:9b334a45a8ff 282 }
bogdanm 0:9b334a45a8ff 283
bogdanm 0:9b334a45a8ff 284 int i2c_byte_read(i2c_t *obj, int last)
bogdanm 0:9b334a45a8ff 285 {
bogdanm 0:9b334a45a8ff 286 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 287 int timeout;
bogdanm 0:9b334a45a8ff 288
bogdanm 0:9b334a45a8ff 289 if (last) {
bogdanm 0:9b334a45a8ff 290 // Don't acknowledge the last byte
bogdanm 0:9b334a45a8ff 291 i2c->CR1 &= ~I2C_CR1_ACK;
bogdanm 0:9b334a45a8ff 292 } else {
bogdanm 0:9b334a45a8ff 293 // Acknowledge the byte
bogdanm 0:9b334a45a8ff 294 i2c->CR1 |= I2C_CR1_ACK;
bogdanm 0:9b334a45a8ff 295 }
bogdanm 0:9b334a45a8ff 296
bogdanm 0:9b334a45a8ff 297 // Wait until the byte is received
bogdanm 0:9b334a45a8ff 298 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 299 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
bogdanm 0:9b334a45a8ff 300 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 301 return -1;
bogdanm 0:9b334a45a8ff 302 }
bogdanm 0:9b334a45a8ff 303 }
bogdanm 0:9b334a45a8ff 304
bogdanm 0:9b334a45a8ff 305 return (int)i2c->DR;
bogdanm 0:9b334a45a8ff 306 }
bogdanm 0:9b334a45a8ff 307
bogdanm 0:9b334a45a8ff 308 int i2c_byte_write(i2c_t *obj, int data)
bogdanm 0:9b334a45a8ff 309 {
bogdanm 0:9b334a45a8ff 310 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 311 int timeout;
bogdanm 0:9b334a45a8ff 312
bogdanm 0:9b334a45a8ff 313 i2c->DR = (uint8_t)data;
bogdanm 0:9b334a45a8ff 314
bogdanm 0:9b334a45a8ff 315 // Wait until the byte is transmitted
bogdanm 0:9b334a45a8ff 316 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 317 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
bogdanm 0:9b334a45a8ff 318 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
bogdanm 0:9b334a45a8ff 319 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 320 return 0;
bogdanm 0:9b334a45a8ff 321 }
bogdanm 0:9b334a45a8ff 322 }
bogdanm 0:9b334a45a8ff 323
bogdanm 0:9b334a45a8ff 324 return 1;
bogdanm 0:9b334a45a8ff 325 }
bogdanm 0:9b334a45a8ff 326
bogdanm 0:9b334a45a8ff 327 void i2c_reset(i2c_t *obj)
bogdanm 0:9b334a45a8ff 328 {
bogdanm 0:9b334a45a8ff 329 int timeout;
bogdanm 0:9b334a45a8ff 330
bogdanm 0:9b334a45a8ff 331 // wait before reset
bogdanm 0:9b334a45a8ff 332 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 333 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
bogdanm 0:9b334a45a8ff 334
bogdanm 0:9b334a45a8ff 335 if (obj->i2c == I2C_1) {
bogdanm 0:9b334a45a8ff 336 __I2C1_FORCE_RESET();
bogdanm 0:9b334a45a8ff 337 __I2C1_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 338 }
bogdanm 0:9b334a45a8ff 339 if (obj->i2c == I2C_2) {
bogdanm 0:9b334a45a8ff 340 __I2C2_FORCE_RESET();
bogdanm 0:9b334a45a8ff 341 __I2C2_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 342 }
mbed_official 25:ac5b0a371348 343 #if defined I2C3_BASE
bogdanm 0:9b334a45a8ff 344 if (obj->i2c == I2C_3) {
bogdanm 0:9b334a45a8ff 345 __I2C3_FORCE_RESET();
bogdanm 0:9b334a45a8ff 346 __I2C3_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 347 }
mbed_official 25:ac5b0a371348 348 #endif
mbed_official 25:ac5b0a371348 349
mbed_official 25:ac5b0a371348 350 #if defined FMPI2C1_BASE
mbed_official 25:ac5b0a371348 351 if (obj->i2c == FMPI2C_1) {
mbed_official 25:ac5b0a371348 352 __HAL_RCC_FMPI2C1_FORCE_RESET();
mbed_official 25:ac5b0a371348 353 __HAL_RCC_FMPI2C1_RELEASE_RESET();
mbed_official 25:ac5b0a371348 354 }
mbed_official 25:ac5b0a371348 355 #endif
bogdanm 0:9b334a45a8ff 356 }
bogdanm 0:9b334a45a8ff 357
bogdanm 0:9b334a45a8ff 358 #if DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 359
bogdanm 0:9b334a45a8ff 360 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
bogdanm 0:9b334a45a8ff 361 {
bogdanm 0:9b334a45a8ff 362 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 363 uint16_t tmpreg = 0;
bogdanm 0:9b334a45a8ff 364
bogdanm 0:9b334a45a8ff 365 // Get the old register value
bogdanm 0:9b334a45a8ff 366 tmpreg = i2c->OAR1;
bogdanm 0:9b334a45a8ff 367 // Reset address bits
bogdanm 0:9b334a45a8ff 368 tmpreg &= 0xFC00;
bogdanm 0:9b334a45a8ff 369 // Set new address
bogdanm 0:9b334a45a8ff 370 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
bogdanm 0:9b334a45a8ff 371 // Store the new register value
bogdanm 0:9b334a45a8ff 372 i2c->OAR1 = tmpreg;
bogdanm 0:9b334a45a8ff 373 }
bogdanm 0:9b334a45a8ff 374
bogdanm 0:9b334a45a8ff 375 void i2c_slave_mode(i2c_t *obj, int enable_slave)
bogdanm 0:9b334a45a8ff 376 {
bogdanm 0:9b334a45a8ff 377 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 378 if (enable_slave) {
bogdanm 0:9b334a45a8ff 379 obj->slave = 1;
bogdanm 0:9b334a45a8ff 380 /* Enable Address Acknowledge */
bogdanm 0:9b334a45a8ff 381 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
bogdanm 0:9b334a45a8ff 382 }
bogdanm 0:9b334a45a8ff 383 }
bogdanm 0:9b334a45a8ff 384
bogdanm 0:9b334a45a8ff 385 // See I2CSlave.h
bogdanm 0:9b334a45a8ff 386 #define NoData 0 // the slave has not been addressed
bogdanm 0:9b334a45a8ff 387 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
bogdanm 0:9b334a45a8ff 388 #define WriteGeneral 2 // the master is writing to all slave
bogdanm 0:9b334a45a8ff 389 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
bogdanm 0:9b334a45a8ff 390
bogdanm 0:9b334a45a8ff 391 int i2c_slave_receive(i2c_t *obj)
bogdanm 0:9b334a45a8ff 392 {
bogdanm 0:9b334a45a8ff 393 int retValue = NoData;
bogdanm 0:9b334a45a8ff 394
bogdanm 0:9b334a45a8ff 395 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
bogdanm 0:9b334a45a8ff 396 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
bogdanm 0:9b334a45a8ff 397 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1)
bogdanm 0:9b334a45a8ff 398 retValue = ReadAddressed;
bogdanm 0:9b334a45a8ff 399 else
bogdanm 0:9b334a45a8ff 400 retValue = WriteAddressed;
bogdanm 0:9b334a45a8ff 401
bogdanm 0:9b334a45a8ff 402 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
bogdanm 0:9b334a45a8ff 403 }
bogdanm 0:9b334a45a8ff 404 }
bogdanm 0:9b334a45a8ff 405
bogdanm 0:9b334a45a8ff 406 return (retValue);
bogdanm 0:9b334a45a8ff 407 }
bogdanm 0:9b334a45a8ff 408
bogdanm 0:9b334a45a8ff 409 int i2c_slave_read(i2c_t *obj, char *data, int length)
bogdanm 0:9b334a45a8ff 410 {
bogdanm 0:9b334a45a8ff 411 uint32_t Timeout;
bogdanm 0:9b334a45a8ff 412 int size = 0;
bogdanm 0:9b334a45a8ff 413
bogdanm 0:9b334a45a8ff 414 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 415
bogdanm 0:9b334a45a8ff 416 while (length > 0) {
bogdanm 0:9b334a45a8ff 417 /* Wait until RXNE flag is set */
bogdanm 0:9b334a45a8ff 418 // Wait until the byte is received
bogdanm 0:9b334a45a8ff 419 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 420 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
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 /* Read data from DR */
bogdanm 0:9b334a45a8ff 428 (*data++) = I2cHandle.Instance->DR;
bogdanm 0:9b334a45a8ff 429 length--;
bogdanm 0:9b334a45a8ff 430 size++;
bogdanm 0:9b334a45a8ff 431
bogdanm 0:9b334a45a8ff 432 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
bogdanm 0:9b334a45a8ff 433 /* Read data from DR */
bogdanm 0:9b334a45a8ff 434 (*data++) = I2cHandle.Instance->DR;
bogdanm 0:9b334a45a8ff 435 length--;
bogdanm 0:9b334a45a8ff 436 size++;
bogdanm 0:9b334a45a8ff 437 }
bogdanm 0:9b334a45a8ff 438 }
bogdanm 0:9b334a45a8ff 439
bogdanm 0:9b334a45a8ff 440 /* Wait until STOP flag is set */
bogdanm 0:9b334a45a8ff 441 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 442 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
bogdanm 0:9b334a45a8ff 443 Timeout--;
bogdanm 0:9b334a45a8ff 444 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 445 return -1;
bogdanm 0:9b334a45a8ff 446 }
bogdanm 0:9b334a45a8ff 447 }
bogdanm 0:9b334a45a8ff 448
bogdanm 0:9b334a45a8ff 449 /* Clear STOP flag */
bogdanm 0:9b334a45a8ff 450 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
bogdanm 0:9b334a45a8ff 451
bogdanm 0:9b334a45a8ff 452 /* Wait until BUSY flag is reset */
bogdanm 0:9b334a45a8ff 453 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 454 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
bogdanm 0:9b334a45a8ff 455 Timeout--;
bogdanm 0:9b334a45a8ff 456 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 457 return -1;
bogdanm 0:9b334a45a8ff 458 }
bogdanm 0:9b334a45a8ff 459 }
bogdanm 0:9b334a45a8ff 460
bogdanm 0:9b334a45a8ff 461 return size;
bogdanm 0:9b334a45a8ff 462 }
bogdanm 0:9b334a45a8ff 463
bogdanm 0:9b334a45a8ff 464 int i2c_slave_write(i2c_t *obj, const char *data, int length)
bogdanm 0:9b334a45a8ff 465 {
bogdanm 0:9b334a45a8ff 466 uint32_t Timeout;
bogdanm 0:9b334a45a8ff 467 int size = 0;
bogdanm 0:9b334a45a8ff 468
bogdanm 0:9b334a45a8ff 469 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 470
bogdanm 0:9b334a45a8ff 471 while (length > 0) {
bogdanm 0:9b334a45a8ff 472 /* Wait until TXE flag is set */
bogdanm 0:9b334a45a8ff 473 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 474 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
bogdanm 0:9b334a45a8ff 475 Timeout--;
bogdanm 0:9b334a45a8ff 476 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 477 return -1;
bogdanm 0:9b334a45a8ff 478 }
bogdanm 0:9b334a45a8ff 479 }
bogdanm 0:9b334a45a8ff 480
bogdanm 0:9b334a45a8ff 481
bogdanm 0:9b334a45a8ff 482 /* Write data to DR */
bogdanm 0:9b334a45a8ff 483 I2cHandle.Instance->DR = (*data++);
bogdanm 0:9b334a45a8ff 484 length--;
bogdanm 0:9b334a45a8ff 485 size++;
bogdanm 0:9b334a45a8ff 486
bogdanm 0:9b334a45a8ff 487 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
bogdanm 0:9b334a45a8ff 488 /* Write data to DR */
bogdanm 0:9b334a45a8ff 489 I2cHandle.Instance->DR = (*data++);
bogdanm 0:9b334a45a8ff 490 length--;
bogdanm 0:9b334a45a8ff 491 size++;
bogdanm 0:9b334a45a8ff 492 }
bogdanm 0:9b334a45a8ff 493 }
bogdanm 0:9b334a45a8ff 494
bogdanm 0:9b334a45a8ff 495 /* Wait until AF flag is set */
bogdanm 0:9b334a45a8ff 496 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 497 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
bogdanm 0:9b334a45a8ff 498 Timeout--;
bogdanm 0:9b334a45a8ff 499 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 500 return -1;
bogdanm 0:9b334a45a8ff 501 }
bogdanm 0:9b334a45a8ff 502 }
bogdanm 0:9b334a45a8ff 503
bogdanm 0:9b334a45a8ff 504
bogdanm 0:9b334a45a8ff 505 /* Clear AF flag */
bogdanm 0:9b334a45a8ff 506 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
bogdanm 0:9b334a45a8ff 507
bogdanm 0:9b334a45a8ff 508
bogdanm 0:9b334a45a8ff 509 /* Wait until BUSY flag is reset */
bogdanm 0:9b334a45a8ff 510 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 511 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
bogdanm 0:9b334a45a8ff 512 Timeout--;
bogdanm 0:9b334a45a8ff 513 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 514 return -1;
bogdanm 0:9b334a45a8ff 515 }
bogdanm 0:9b334a45a8ff 516 }
bogdanm 0:9b334a45a8ff 517
bogdanm 0:9b334a45a8ff 518 I2cHandle.State = HAL_I2C_STATE_READY;
bogdanm 0:9b334a45a8ff 519
bogdanm 0:9b334a45a8ff 520 /* Process Unlocked */
bogdanm 0:9b334a45a8ff 521 __HAL_UNLOCK(&I2cHandle);
bogdanm 0:9b334a45a8ff 522
bogdanm 0:9b334a45a8ff 523 return size;
bogdanm 0:9b334a45a8ff 524 }
bogdanm 0:9b334a45a8ff 525
bogdanm 0:9b334a45a8ff 526
bogdanm 0:9b334a45a8ff 527 #endif // DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 528
bogdanm 0:9b334a45a8ff 529 #endif // DEVICE_I2C