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Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_STM32F7/i2c_api.c@573:ad23fe03a082, 2015-06-19 (annotated)

Committer:
mbed_official
Date:
Fri Jun 19 09:15:11 2015 +0100
Revision:
573:ad23fe03a082
Child:
582:a89625bcd809
Synchronized with git revision d47834cd4d729e5b36b4c1ad4650f8b8f6a9ab86



Full URL: https://github.com/mbedmicro/mbed/commit/d47834cd4d729e5b36b4c1ad4650f8b8f6a9ab86/



DISCO_F746NG - Add new target

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 573:ad23fe03a082 1 /* mbed Microcontroller Library
mbed_official 573:ad23fe03a082 2 *******************************************************************************
mbed_official 573:ad23fe03a082 3 * Copyright (c) 2015, STMicroelectronics
mbed_official 573:ad23fe03a082 4 * All rights reserved.
mbed_official 573:ad23fe03a082 5 *
mbed_official 573:ad23fe03a082 6 * Redistribution and use in source and binary forms, with or without
mbed_official 573:ad23fe03a082 7 * modification, are permitted provided that the following conditions are met:
mbed_official 573:ad23fe03a082 8 *
mbed_official 573:ad23fe03a082 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 573:ad23fe03a082 10 * this list of conditions and the following disclaimer.
mbed_official 573:ad23fe03a082 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 573:ad23fe03a082 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 573:ad23fe03a082 13 * and/or other materials provided with the distribution.
mbed_official 573:ad23fe03a082 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 573:ad23fe03a082 15 * may be used to endorse or promote products derived from this software
mbed_official 573:ad23fe03a082 16 * without specific prior written permission.
mbed_official 573:ad23fe03a082 17 *
mbed_official 573:ad23fe03a082 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 573:ad23fe03a082 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 573:ad23fe03a082 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 573:ad23fe03a082 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 573:ad23fe03a082 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 573:ad23fe03a082 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 573:ad23fe03a082 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 573:ad23fe03a082 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 573:ad23fe03a082 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 573:ad23fe03a082 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 573:ad23fe03a082 28 *******************************************************************************
mbed_official 573:ad23fe03a082 29 */
mbed_official 573:ad23fe03a082 30 #include "mbed_assert.h"
mbed_official 573:ad23fe03a082 31 #include "i2c_api.h"
mbed_official 573:ad23fe03a082 32
mbed_official 573:ad23fe03a082 33 #if DEVICE_I2C
mbed_official 573:ad23fe03a082 34
mbed_official 573:ad23fe03a082 35 #include "cmsis.h"
mbed_official 573:ad23fe03a082 36 #include "pinmap.h"
mbed_official 573:ad23fe03a082 37 #include "PeripheralPins.h"
mbed_official 573:ad23fe03a082 38
mbed_official 573:ad23fe03a082 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 573:ad23fe03a082 40 not based on accurate values, they just guarantee that the application will
mbed_official 573:ad23fe03a082 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 573:ad23fe03a082 42 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 573:ad23fe03a082 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 573:ad23fe03a082 44
mbed_official 573:ad23fe03a082 45 I2C_HandleTypeDef I2cHandle;
mbed_official 573:ad23fe03a082 46
mbed_official 573:ad23fe03a082 47 int i2c1_inited = 0;
mbed_official 573:ad23fe03a082 48 int i2c2_inited = 0;
mbed_official 573:ad23fe03a082 49 int i2c3_inited = 0;
mbed_official 573:ad23fe03a082 50
mbed_official 573:ad23fe03a082 51 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
mbed_official 573:ad23fe03a082 52 {
mbed_official 573:ad23fe03a082 53 // Determine the I2C to use
mbed_official 573:ad23fe03a082 54 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 573:ad23fe03a082 55 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 573:ad23fe03a082 56
mbed_official 573:ad23fe03a082 57 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 573:ad23fe03a082 58 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 573:ad23fe03a082 59
mbed_official 573:ad23fe03a082 60 // Enable I2C1 clock and pinout if not done
mbed_official 573:ad23fe03a082 61 if ((obj->i2c == I2C_1) && !i2c1_inited) {
mbed_official 573:ad23fe03a082 62 i2c1_inited = 1;
mbed_official 573:ad23fe03a082 63 __I2C1_CLK_ENABLE();
mbed_official 573:ad23fe03a082 64 // Configure I2C pins
mbed_official 573:ad23fe03a082 65 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 573:ad23fe03a082 66 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 573:ad23fe03a082 67 pin_mode(sda, OpenDrain);
mbed_official 573:ad23fe03a082 68 pin_mode(scl, OpenDrain);
mbed_official 573:ad23fe03a082 69 }
mbed_official 573:ad23fe03a082 70 // Enable I2C2 clock and pinout if not done
mbed_official 573:ad23fe03a082 71 if ((obj->i2c == I2C_2) && !i2c2_inited) {
mbed_official 573:ad23fe03a082 72 i2c2_inited = 1;
mbed_official 573:ad23fe03a082 73 __I2C2_CLK_ENABLE();
mbed_official 573:ad23fe03a082 74 // Configure I2C pins
mbed_official 573:ad23fe03a082 75 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 573:ad23fe03a082 76 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 573:ad23fe03a082 77 pin_mode(sda, OpenDrain);
mbed_official 573:ad23fe03a082 78 pin_mode(scl, OpenDrain);
mbed_official 573:ad23fe03a082 79 }
mbed_official 573:ad23fe03a082 80 // Enable I2C3 clock and pinout if not done
mbed_official 573:ad23fe03a082 81 if ((obj->i2c == I2C_3) && !i2c3_inited) {
mbed_official 573:ad23fe03a082 82 i2c3_inited = 1;
mbed_official 573:ad23fe03a082 83 __I2C3_CLK_ENABLE();
mbed_official 573:ad23fe03a082 84 // Configure I2C pins
mbed_official 573:ad23fe03a082 85 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 573:ad23fe03a082 86 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 573:ad23fe03a082 87 pin_mode(sda, OpenDrain);
mbed_official 573:ad23fe03a082 88 pin_mode(scl, OpenDrain);
mbed_official 573:ad23fe03a082 89 }
mbed_official 573:ad23fe03a082 90
mbed_official 573:ad23fe03a082 91 // Reset to clear pending flags if any
mbed_official 573:ad23fe03a082 92 i2c_reset(obj);
mbed_official 573:ad23fe03a082 93
mbed_official 573:ad23fe03a082 94 // I2C configuration
mbed_official 573:ad23fe03a082 95 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 573:ad23fe03a082 96
mbed_official 573:ad23fe03a082 97 // I2C master by default
mbed_official 573:ad23fe03a082 98 obj->slave = 0;
mbed_official 573:ad23fe03a082 99 }
mbed_official 573:ad23fe03a082 100
mbed_official 573:ad23fe03a082 101 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 573:ad23fe03a082 102 {
mbed_official 573:ad23fe03a082 103 MBED_ASSERT((hz != 0) && (hz <= 400000));
mbed_official 573:ad23fe03a082 104 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 105 int timeout;
mbed_official 573:ad23fe03a082 106
mbed_official 573:ad23fe03a082 107 // wait before init
mbed_official 573:ad23fe03a082 108 timeout = LONG_TIMEOUT;
mbed_official 573:ad23fe03a082 109 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 573:ad23fe03a082 110
mbed_official 573:ad23fe03a082 111 // I2C configuration
mbed_official 573:ad23fe03a082 112 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 573:ad23fe03a082 113 I2cHandle.Init.ClockSpeed = hz;
mbed_official 573:ad23fe03a082 114 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 573:ad23fe03a082 115 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
mbed_official 573:ad23fe03a082 116 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 573:ad23fe03a082 117 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 573:ad23fe03a082 118 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 573:ad23fe03a082 119 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 573:ad23fe03a082 120 HAL_I2C_Init(&I2cHandle);
mbed_official 573:ad23fe03a082 121 if (obj->slave) {
mbed_official 573:ad23fe03a082 122 /* Enable Address Acknowledge */
mbed_official 573:ad23fe03a082 123 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 573:ad23fe03a082 124 }
mbed_official 573:ad23fe03a082 125
mbed_official 573:ad23fe03a082 126 }
mbed_official 573:ad23fe03a082 127
mbed_official 573:ad23fe03a082 128 inline int i2c_start(i2c_t *obj)
mbed_official 573:ad23fe03a082 129 {
mbed_official 573:ad23fe03a082 130 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 131 int timeout;
mbed_official 573:ad23fe03a082 132
mbed_official 573:ad23fe03a082 133 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 134
mbed_official 573:ad23fe03a082 135 // Clear Acknowledge failure flag
mbed_official 573:ad23fe03a082 136 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 573:ad23fe03a082 137
mbed_official 573:ad23fe03a082 138 // Generate the START condition
mbed_official 573:ad23fe03a082 139 i2c->CR1 |= I2C_CR1_START;
mbed_official 573:ad23fe03a082 140
mbed_official 573:ad23fe03a082 141 // Wait the START condition has been correctly sent
mbed_official 573:ad23fe03a082 142 timeout = FLAG_TIMEOUT;
mbed_official 573:ad23fe03a082 143 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 573:ad23fe03a082 144 if ((timeout--) == 0) {
mbed_official 573:ad23fe03a082 145 return 1;
mbed_official 573:ad23fe03a082 146 }
mbed_official 573:ad23fe03a082 147 }
mbed_official 573:ad23fe03a082 148
mbed_official 573:ad23fe03a082 149 return 0;
mbed_official 573:ad23fe03a082 150 }
mbed_official 573:ad23fe03a082 151
mbed_official 573:ad23fe03a082 152 inline int i2c_stop(i2c_t *obj)
mbed_official 573:ad23fe03a082 153 {
mbed_official 573:ad23fe03a082 154 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 155
mbed_official 573:ad23fe03a082 156 // Generate the STOP condition
mbed_official 573:ad23fe03a082 157 i2c->CR1 |= I2C_CR1_STOP;
mbed_official 573:ad23fe03a082 158
mbed_official 573:ad23fe03a082 159 return 0;
mbed_official 573:ad23fe03a082 160 }
mbed_official 573:ad23fe03a082 161
mbed_official 573:ad23fe03a082 162 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 573:ad23fe03a082 163 {
mbed_official 573:ad23fe03a082 164 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 165 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 166 int timeout;
mbed_official 573:ad23fe03a082 167 int count;
mbed_official 573:ad23fe03a082 168 int value;
mbed_official 573:ad23fe03a082 169
mbed_official 573:ad23fe03a082 170 i2c_start(obj);
mbed_official 573:ad23fe03a082 171
mbed_official 573:ad23fe03a082 172 // Wait until SB flag is set
mbed_official 573:ad23fe03a082 173 timeout = FLAG_TIMEOUT;
mbed_official 573:ad23fe03a082 174 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 573:ad23fe03a082 175 timeout--;
mbed_official 573:ad23fe03a082 176 if (timeout == 0) {
mbed_official 573:ad23fe03a082 177 return -1;
mbed_official 573:ad23fe03a082 178 }
mbed_official 573:ad23fe03a082 179 }
mbed_official 573:ad23fe03a082 180
mbed_official 573:ad23fe03a082 181 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
mbed_official 573:ad23fe03a082 182
mbed_official 573:ad23fe03a082 183
mbed_official 573:ad23fe03a082 184 // Wait address is acknowledged
mbed_official 573:ad23fe03a082 185 timeout = FLAG_TIMEOUT;
mbed_official 573:ad23fe03a082 186 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 573:ad23fe03a082 187 timeout--;
mbed_official 573:ad23fe03a082 188 if (timeout == 0) {
mbed_official 573:ad23fe03a082 189 return -1;
mbed_official 573:ad23fe03a082 190 }
mbed_official 573:ad23fe03a082 191 }
mbed_official 573:ad23fe03a082 192 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 573:ad23fe03a082 193
mbed_official 573:ad23fe03a082 194 // Read all bytes except last one
mbed_official 573:ad23fe03a082 195 for (count = 0; count < (length - 1); count++) {
mbed_official 573:ad23fe03a082 196 value = i2c_byte_read(obj, 0);
mbed_official 573:ad23fe03a082 197 data[count] = (char)value;
mbed_official 573:ad23fe03a082 198 }
mbed_official 573:ad23fe03a082 199
mbed_official 573:ad23fe03a082 200 // If not repeated start, send stop.
mbed_official 573:ad23fe03a082 201 // Warning: must be done BEFORE the data is read.
mbed_official 573:ad23fe03a082 202 if (stop) {
mbed_official 573:ad23fe03a082 203 i2c_stop(obj);
mbed_official 573:ad23fe03a082 204 }
mbed_official 573:ad23fe03a082 205
mbed_official 573:ad23fe03a082 206 // Read the last byte
mbed_official 573:ad23fe03a082 207 value = i2c_byte_read(obj, 1);
mbed_official 573:ad23fe03a082 208 data[count] = (char)value;
mbed_official 573:ad23fe03a082 209
mbed_official 573:ad23fe03a082 210 return length;
mbed_official 573:ad23fe03a082 211 }
mbed_official 573:ad23fe03a082 212
mbed_official 573:ad23fe03a082 213 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 573:ad23fe03a082 214 {
mbed_official 573:ad23fe03a082 215 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 216 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 217 int timeout;
mbed_official 573:ad23fe03a082 218 int count;
mbed_official 573:ad23fe03a082 219
mbed_official 573:ad23fe03a082 220 i2c_start(obj);
mbed_official 573:ad23fe03a082 221
mbed_official 573:ad23fe03a082 222 // Wait until SB flag is set
mbed_official 573:ad23fe03a082 223 timeout = FLAG_TIMEOUT;
mbed_official 573:ad23fe03a082 224 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 573:ad23fe03a082 225 timeout--;
mbed_official 573:ad23fe03a082 226 if (timeout == 0) {
mbed_official 573:ad23fe03a082 227 return -1;
mbed_official 573:ad23fe03a082 228 }
mbed_official 573:ad23fe03a082 229 }
mbed_official 573:ad23fe03a082 230
mbed_official 573:ad23fe03a082 231 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
mbed_official 573:ad23fe03a082 232
mbed_official 573:ad23fe03a082 233
mbed_official 573:ad23fe03a082 234 // Wait address is acknowledged
mbed_official 573:ad23fe03a082 235 timeout = FLAG_TIMEOUT;
mbed_official 573:ad23fe03a082 236 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 573:ad23fe03a082 237 timeout--;
mbed_official 573:ad23fe03a082 238 if (timeout == 0) {
mbed_official 573:ad23fe03a082 239 return -1;
mbed_official 573:ad23fe03a082 240 }
mbed_official 573:ad23fe03a082 241 }
mbed_official 573:ad23fe03a082 242 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 573:ad23fe03a082 243
mbed_official 573:ad23fe03a082 244 for (count = 0; count < length; count++) {
mbed_official 573:ad23fe03a082 245 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 573:ad23fe03a082 246 i2c_stop(obj);
mbed_official 573:ad23fe03a082 247 return -1;
mbed_official 573:ad23fe03a082 248 }
mbed_official 573:ad23fe03a082 249 }
mbed_official 573:ad23fe03a082 250
mbed_official 573:ad23fe03a082 251 // If not repeated start, send stop.
mbed_official 573:ad23fe03a082 252 if (stop) {
mbed_official 573:ad23fe03a082 253 i2c_stop(obj);
mbed_official 573:ad23fe03a082 254 }
mbed_official 573:ad23fe03a082 255
mbed_official 573:ad23fe03a082 256 return count;
mbed_official 573:ad23fe03a082 257 }
mbed_official 573:ad23fe03a082 258
mbed_official 573:ad23fe03a082 259 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 573:ad23fe03a082 260 {
mbed_official 573:ad23fe03a082 261 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 262 int timeout;
mbed_official 573:ad23fe03a082 263
mbed_official 573:ad23fe03a082 264 if (last) {
mbed_official 573:ad23fe03a082 265 // Don't acknowledge the last byte
mbed_official 573:ad23fe03a082 266 i2c->CR1 &= ~I2C_CR1_ACK;
mbed_official 573:ad23fe03a082 267 } else {
mbed_official 573:ad23fe03a082 268 // Acknowledge the byte
mbed_official 573:ad23fe03a082 269 i2c->CR1 |= I2C_CR1_ACK;
mbed_official 573:ad23fe03a082 270 }
mbed_official 573:ad23fe03a082 271
mbed_official 573:ad23fe03a082 272 // Wait until the byte is received
mbed_official 573:ad23fe03a082 273 timeout = FLAG_TIMEOUT;
mbed_official 573:ad23fe03a082 274 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 573:ad23fe03a082 275 if ((timeout--) == 0) {
mbed_official 573:ad23fe03a082 276 return -1;
mbed_official 573:ad23fe03a082 277 }
mbed_official 573:ad23fe03a082 278 }
mbed_official 573:ad23fe03a082 279
mbed_official 573:ad23fe03a082 280 return (int)i2c->DR;
mbed_official 573:ad23fe03a082 281 }
mbed_official 573:ad23fe03a082 282
mbed_official 573:ad23fe03a082 283 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 573:ad23fe03a082 284 {
mbed_official 573:ad23fe03a082 285 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 286 int timeout;
mbed_official 573:ad23fe03a082 287
mbed_official 573:ad23fe03a082 288 i2c->DR = (uint8_t)data;
mbed_official 573:ad23fe03a082 289
mbed_official 573:ad23fe03a082 290 // Wait until the byte is transmitted
mbed_official 573:ad23fe03a082 291 timeout = FLAG_TIMEOUT;
mbed_official 573:ad23fe03a082 292 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
mbed_official 573:ad23fe03a082 293 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
mbed_official 573:ad23fe03a082 294 if ((timeout--) == 0) {
mbed_official 573:ad23fe03a082 295 return 0;
mbed_official 573:ad23fe03a082 296 }
mbed_official 573:ad23fe03a082 297 }
mbed_official 573:ad23fe03a082 298
mbed_official 573:ad23fe03a082 299 return 1;
mbed_official 573:ad23fe03a082 300 }
mbed_official 573:ad23fe03a082 301
mbed_official 573:ad23fe03a082 302 void i2c_reset(i2c_t *obj)
mbed_official 573:ad23fe03a082 303 {
mbed_official 573:ad23fe03a082 304 int timeout;
mbed_official 573:ad23fe03a082 305
mbed_official 573:ad23fe03a082 306 // wait before reset
mbed_official 573:ad23fe03a082 307 timeout = LONG_TIMEOUT;
mbed_official 573:ad23fe03a082 308 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 573:ad23fe03a082 309
mbed_official 573:ad23fe03a082 310 if (obj->i2c == I2C_1) {
mbed_official 573:ad23fe03a082 311 __I2C1_FORCE_RESET();
mbed_official 573:ad23fe03a082 312 __I2C1_RELEASE_RESET();
mbed_official 573:ad23fe03a082 313 }
mbed_official 573:ad23fe03a082 314 if (obj->i2c == I2C_2) {
mbed_official 573:ad23fe03a082 315 __I2C2_FORCE_RESET();
mbed_official 573:ad23fe03a082 316 __I2C2_RELEASE_RESET();
mbed_official 573:ad23fe03a082 317 }
mbed_official 573:ad23fe03a082 318 if (obj->i2c == I2C_3) {
mbed_official 573:ad23fe03a082 319 __I2C3_FORCE_RESET();
mbed_official 573:ad23fe03a082 320 __I2C3_RELEASE_RESET();
mbed_official 573:ad23fe03a082 321 }
mbed_official 573:ad23fe03a082 322 }
mbed_official 573:ad23fe03a082 323
mbed_official 573:ad23fe03a082 324 #if DEVICE_I2CSLAVE
mbed_official 573:ad23fe03a082 325
mbed_official 573:ad23fe03a082 326 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 573:ad23fe03a082 327 {
mbed_official 573:ad23fe03a082 328 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 329 uint16_t tmpreg = 0;
mbed_official 573:ad23fe03a082 330
mbed_official 573:ad23fe03a082 331 // Get the old register value
mbed_official 573:ad23fe03a082 332 tmpreg = i2c->OAR1;
mbed_official 573:ad23fe03a082 333 // Reset address bits
mbed_official 573:ad23fe03a082 334 tmpreg &= 0xFC00;
mbed_official 573:ad23fe03a082 335 // Set new address
mbed_official 573:ad23fe03a082 336 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 573:ad23fe03a082 337 // Store the new register value
mbed_official 573:ad23fe03a082 338 i2c->OAR1 = tmpreg;
mbed_official 573:ad23fe03a082 339 }
mbed_official 573:ad23fe03a082 340
mbed_official 573:ad23fe03a082 341 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 573:ad23fe03a082 342 {
mbed_official 573:ad23fe03a082 343 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 344 if (enable_slave) {
mbed_official 573:ad23fe03a082 345 obj->slave = 1;
mbed_official 573:ad23fe03a082 346 /* Enable Address Acknowledge */
mbed_official 573:ad23fe03a082 347 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 573:ad23fe03a082 348 }
mbed_official 573:ad23fe03a082 349 }
mbed_official 573:ad23fe03a082 350
mbed_official 573:ad23fe03a082 351 // See I2CSlave.h
mbed_official 573:ad23fe03a082 352 #define NoData 0 // the slave has not been addressed
mbed_official 573:ad23fe03a082 353 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 573:ad23fe03a082 354 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 573:ad23fe03a082 355 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 573:ad23fe03a082 356
mbed_official 573:ad23fe03a082 357 int i2c_slave_receive(i2c_t *obj)
mbed_official 573:ad23fe03a082 358 {
mbed_official 573:ad23fe03a082 359 int retValue = NoData;
mbed_official 573:ad23fe03a082 360
mbed_official 573:ad23fe03a082 361 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 573:ad23fe03a082 362 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 573:ad23fe03a082 363 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1)
mbed_official 573:ad23fe03a082 364 retValue = ReadAddressed;
mbed_official 573:ad23fe03a082 365 else
mbed_official 573:ad23fe03a082 366 retValue = WriteAddressed;
mbed_official 573:ad23fe03a082 367
mbed_official 573:ad23fe03a082 368 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 573:ad23fe03a082 369 }
mbed_official 573:ad23fe03a082 370 }
mbed_official 573:ad23fe03a082 371
mbed_official 573:ad23fe03a082 372 return (retValue);
mbed_official 573:ad23fe03a082 373 }
mbed_official 573:ad23fe03a082 374
mbed_official 573:ad23fe03a082 375 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 573:ad23fe03a082 376 {
mbed_official 573:ad23fe03a082 377 uint32_t Timeout;
mbed_official 573:ad23fe03a082 378 int size = 0;
mbed_official 573:ad23fe03a082 379
mbed_official 573:ad23fe03a082 380 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 381
mbed_official 573:ad23fe03a082 382 while (length > 0) {
mbed_official 573:ad23fe03a082 383 /* Wait until RXNE flag is set */
mbed_official 573:ad23fe03a082 384 // Wait until the byte is received
mbed_official 573:ad23fe03a082 385 Timeout = FLAG_TIMEOUT;
mbed_official 573:ad23fe03a082 386 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 573:ad23fe03a082 387 Timeout--;
mbed_official 573:ad23fe03a082 388 if (Timeout == 0) {
mbed_official 573:ad23fe03a082 389 return -1;
mbed_official 573:ad23fe03a082 390 }
mbed_official 573:ad23fe03a082 391 }
mbed_official 573:ad23fe03a082 392
mbed_official 573:ad23fe03a082 393 /* Read data from DR */
mbed_official 573:ad23fe03a082 394 (*data++) = I2cHandle.Instance->DR;
mbed_official 573:ad23fe03a082 395 length--;
mbed_official 573:ad23fe03a082 396 size++;
mbed_official 573:ad23fe03a082 397
mbed_official 573:ad23fe03a082 398 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 573:ad23fe03a082 399 /* Read data from DR */
mbed_official 573:ad23fe03a082 400 (*data++) = I2cHandle.Instance->DR;
mbed_official 573:ad23fe03a082 401 length--;
mbed_official 573:ad23fe03a082 402 size++;
mbed_official 573:ad23fe03a082 403 }
mbed_official 573:ad23fe03a082 404 }
mbed_official 573:ad23fe03a082 405
mbed_official 573:ad23fe03a082 406 /* Wait until STOP flag is set */
mbed_official 573:ad23fe03a082 407 Timeout = FLAG_TIMEOUT;
mbed_official 573:ad23fe03a082 408 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 573:ad23fe03a082 409 Timeout--;
mbed_official 573:ad23fe03a082 410 if (Timeout == 0) {
mbed_official 573:ad23fe03a082 411 return -1;
mbed_official 573:ad23fe03a082 412 }
mbed_official 573:ad23fe03a082 413 }
mbed_official 573:ad23fe03a082 414
mbed_official 573:ad23fe03a082 415 /* Clear STOP flag */
mbed_official 573:ad23fe03a082 416 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
mbed_official 573:ad23fe03a082 417
mbed_official 573:ad23fe03a082 418 /* Wait until BUSY flag is reset */
mbed_official 573:ad23fe03a082 419 Timeout = FLAG_TIMEOUT;
mbed_official 573:ad23fe03a082 420 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 573:ad23fe03a082 421 Timeout--;
mbed_official 573:ad23fe03a082 422 if (Timeout == 0) {
mbed_official 573:ad23fe03a082 423 return -1;
mbed_official 573:ad23fe03a082 424 }
mbed_official 573:ad23fe03a082 425 }
mbed_official 573:ad23fe03a082 426
mbed_official 573:ad23fe03a082 427 return size;
mbed_official 573:ad23fe03a082 428 }
mbed_official 573:ad23fe03a082 429
mbed_official 573:ad23fe03a082 430 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 573:ad23fe03a082 431 {
mbed_official 573:ad23fe03a082 432 uint32_t Timeout;
mbed_official 573:ad23fe03a082 433 int size = 0;
mbed_official 573:ad23fe03a082 434
mbed_official 573:ad23fe03a082 435 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 573:ad23fe03a082 436
mbed_official 573:ad23fe03a082 437 while (length > 0) {
mbed_official 573:ad23fe03a082 438 /* Wait until TXE flag is set */
mbed_official 573:ad23fe03a082 439 Timeout = FLAG_TIMEOUT;
mbed_official 573:ad23fe03a082 440 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
mbed_official 573:ad23fe03a082 441 Timeout--;
mbed_official 573:ad23fe03a082 442 if (Timeout == 0) {
mbed_official 573:ad23fe03a082 443 return -1;
mbed_official 573:ad23fe03a082 444 }
mbed_official 573:ad23fe03a082 445 }
mbed_official 573:ad23fe03a082 446
mbed_official 573:ad23fe03a082 447
mbed_official 573:ad23fe03a082 448 /* Write data to DR */
mbed_official 573:ad23fe03a082 449 I2cHandle.Instance->DR = (*data++);
mbed_official 573:ad23fe03a082 450 length--;
mbed_official 573:ad23fe03a082 451 size++;
mbed_official 573:ad23fe03a082 452
mbed_official 573:ad23fe03a082 453 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 573:ad23fe03a082 454 /* Write data to DR */
mbed_official 573:ad23fe03a082 455 I2cHandle.Instance->DR = (*data++);
mbed_official 573:ad23fe03a082 456 length--;
mbed_official 573:ad23fe03a082 457 size++;
mbed_official 573:ad23fe03a082 458 }
mbed_official 573:ad23fe03a082 459 }
mbed_official 573:ad23fe03a082 460
mbed_official 573:ad23fe03a082 461 /* Wait until AF flag is set */
mbed_official 573:ad23fe03a082 462 Timeout = FLAG_TIMEOUT;
mbed_official 573:ad23fe03a082 463 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
mbed_official 573:ad23fe03a082 464 Timeout--;
mbed_official 573:ad23fe03a082 465 if (Timeout == 0) {
mbed_official 573:ad23fe03a082 466 return -1;
mbed_official 573:ad23fe03a082 467 }
mbed_official 573:ad23fe03a082 468 }
mbed_official 573:ad23fe03a082 469
mbed_official 573:ad23fe03a082 470
mbed_official 573:ad23fe03a082 471 /* Clear AF flag */
mbed_official 573:ad23fe03a082 472 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 573:ad23fe03a082 473
mbed_official 573:ad23fe03a082 474
mbed_official 573:ad23fe03a082 475 /* Wait until BUSY flag is reset */
mbed_official 573:ad23fe03a082 476 Timeout = FLAG_TIMEOUT;
mbed_official 573:ad23fe03a082 477 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 573:ad23fe03a082 478 Timeout--;
mbed_official 573:ad23fe03a082 479 if (Timeout == 0) {
mbed_official 573:ad23fe03a082 480 return -1;
mbed_official 573:ad23fe03a082 481 }
mbed_official 573:ad23fe03a082 482 }
mbed_official 573:ad23fe03a082 483
mbed_official 573:ad23fe03a082 484 I2cHandle.State = HAL_I2C_STATE_READY;
mbed_official 573:ad23fe03a082 485
mbed_official 573:ad23fe03a082 486 /* Process Unlocked */
mbed_official 573:ad23fe03a082 487 __HAL_UNLOCK(&I2cHandle);
mbed_official 573:ad23fe03a082 488
mbed_official 573:ad23fe03a082 489 return size;
mbed_official 573:ad23fe03a082 490 }
mbed_official 573:ad23fe03a082 491
mbed_official 573:ad23fe03a082 492
mbed_official 573:ad23fe03a082 493 #endif // DEVICE_I2CSLAVE
mbed_official 573:ad23fe03a082 494
mbed_official 573:ad23fe03a082 495 #endif // DEVICE_I2C