b luo / mbed-dev

mbed library sources. With a patch for the can_api

Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32F2/i2c_api.c@151:91825d030f9b, 2016-11-14 (annotated)

Committer:
DangerousElectrician
Date:
Mon Nov 14 04:39:23 2016 +0000
Revision:
151:91825d030f9b
Parent:
149:156823d33999 
stuff changed?

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 *******************************************************************************
<> 144:ef7eb2e8f9f7 3 * Copyright (c) 2016, STMicroelectronics
<> 144:ef7eb2e8f9f7 4 * All rights reserved.
<> 144:ef7eb2e8f9f7 5 *
<> 144:ef7eb2e8f9f7 6 * Redistribution and use in source and binary forms, with or without
<> 144:ef7eb2e8f9f7 7 * modification, are permitted provided that the following conditions are met:
<> 144:ef7eb2e8f9f7 8 *
<> 144:ef7eb2e8f9f7 9 * 1. Redistributions of source code must retain the above copyright notice,
<> 144:ef7eb2e8f9f7 10 * this list of conditions and the following disclaimer.
<> 144:ef7eb2e8f9f7 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 144:ef7eb2e8f9f7 12 * this list of conditions and the following disclaimer in the documentation
<> 144:ef7eb2e8f9f7 13 * and/or other materials provided with the distribution.
<> 144:ef7eb2e8f9f7 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 144:ef7eb2e8f9f7 15 * may be used to endorse or promote products derived from this software
<> 144:ef7eb2e8f9f7 16 * without specific prior written permission.
<> 144:ef7eb2e8f9f7 17 *
<> 144:ef7eb2e8f9f7 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 144:ef7eb2e8f9f7 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 144:ef7eb2e8f9f7 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 144:ef7eb2e8f9f7 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 144:ef7eb2e8f9f7 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 144:ef7eb2e8f9f7 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 144:ef7eb2e8f9f7 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 144:ef7eb2e8f9f7 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 144:ef7eb2e8f9f7 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 144:ef7eb2e8f9f7 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 144:ef7eb2e8f9f7 28 *******************************************************************************
<> 144:ef7eb2e8f9f7 29 */
<> 144:ef7eb2e8f9f7 30 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 31 #include "i2c_api.h"
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 #if DEVICE_I2C
<> 144:ef7eb2e8f9f7 34
<> 144:ef7eb2e8f9f7 35 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 36 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 37 #include "PeripheralPins.h"
<> 144:ef7eb2e8f9f7 38
<> 144:ef7eb2e8f9f7 39 /* Timeout values for flags and events waiting loops. These timeouts are
<> 144:ef7eb2e8f9f7 40 not based on accurate values, they just guarantee that the application will
<> 144:ef7eb2e8f9f7 41 not remain stuck if the I2C communication is corrupted. */
<> 144:ef7eb2e8f9f7 42 #define FLAG_TIMEOUT ((int)0x1000)
<> 144:ef7eb2e8f9f7 43 #define LONG_TIMEOUT ((int)0x8000)
<> 144:ef7eb2e8f9f7 44
<> 144:ef7eb2e8f9f7 45 I2C_HandleTypeDef I2cHandle;
<> 144:ef7eb2e8f9f7 46
<> 144:ef7eb2e8f9f7 47 int i2c1_inited = 0;
<> 144:ef7eb2e8f9f7 48 int i2c2_inited = 0;
<> 144:ef7eb2e8f9f7 49 int i2c3_inited = 0;
<> 144:ef7eb2e8f9f7 50 int fmpi2c1_inited = 0;
<> 144:ef7eb2e8f9f7 51
<> 144:ef7eb2e8f9f7 52 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
<> 144:ef7eb2e8f9f7 53 {
<> 144:ef7eb2e8f9f7 54 // Determine the I2C to use
<> 144:ef7eb2e8f9f7 55 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
<> 144:ef7eb2e8f9f7 56 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
<> 144:ef7eb2e8f9f7 57
<> 144:ef7eb2e8f9f7 58 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
<> 144:ef7eb2e8f9f7 59 MBED_ASSERT(obj->i2c != (I2CName)NC);
<> 144:ef7eb2e8f9f7 60
<> 144:ef7eb2e8f9f7 61 // Enable I2C1 clock and pinout if not done
<> 144:ef7eb2e8f9f7 62 if ((obj->i2c == I2C_1) && !i2c1_inited) {
<> 144:ef7eb2e8f9f7 63 i2c1_inited = 1;
<> 144:ef7eb2e8f9f7 64 __I2C1_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 65 // Configure I2C pins
<> 144:ef7eb2e8f9f7 66 pinmap_pinout(sda, PinMap_I2C_SDA);
<> 144:ef7eb2e8f9f7 67 pinmap_pinout(scl, PinMap_I2C_SCL);
<> 144:ef7eb2e8f9f7 68 pin_mode(sda, OpenDrain);
<> 144:ef7eb2e8f9f7 69 pin_mode(scl, OpenDrain);
<> 144:ef7eb2e8f9f7 70 }
<> 144:ef7eb2e8f9f7 71 // Enable I2C2 clock and pinout if not done
<> 144:ef7eb2e8f9f7 72 if ((obj->i2c == I2C_2) && !i2c2_inited) {
<> 144:ef7eb2e8f9f7 73 i2c2_inited = 1;
<> 144:ef7eb2e8f9f7 74 __I2C2_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 75 // Configure I2C pins
<> 144:ef7eb2e8f9f7 76 pinmap_pinout(sda, PinMap_I2C_SDA);
<> 144:ef7eb2e8f9f7 77 pinmap_pinout(scl, PinMap_I2C_SCL);
<> 144:ef7eb2e8f9f7 78 pin_mode(sda, OpenDrain);
<> 144:ef7eb2e8f9f7 79 pin_mode(scl, OpenDrain);
<> 144:ef7eb2e8f9f7 80 }
<> 144:ef7eb2e8f9f7 81 #if defined I2C3_BASE
<> 144:ef7eb2e8f9f7 82 // Enable I2C3 clock and pinout if not done
<> 144:ef7eb2e8f9f7 83 if ((obj->i2c == I2C_3) && !i2c3_inited) {
<> 144:ef7eb2e8f9f7 84 i2c3_inited = 1;
<> 144:ef7eb2e8f9f7 85 __I2C3_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 86 // Configure I2C pins
<> 144:ef7eb2e8f9f7 87 pinmap_pinout(sda, PinMap_I2C_SDA);
<> 144:ef7eb2e8f9f7 88 pinmap_pinout(scl, PinMap_I2C_SCL);
<> 144:ef7eb2e8f9f7 89 pin_mode(sda, OpenDrain);
<> 144:ef7eb2e8f9f7 90 pin_mode(scl, OpenDrain);
<> 144:ef7eb2e8f9f7 91 }
<> 144:ef7eb2e8f9f7 92 #endif
<> 144:ef7eb2e8f9f7 93
<> 144:ef7eb2e8f9f7 94 #if defined FMPI2C1_BASE
<> 144:ef7eb2e8f9f7 95 // Enable I2C3 clock and pinout if not done
<> 144:ef7eb2e8f9f7 96 if ((obj->i2c == FMPI2C_1) && !fmpi2c1_inited) {
<> 144:ef7eb2e8f9f7 97 fmpi2c1_inited = 1;
<> 144:ef7eb2e8f9f7 98 __HAL_RCC_FMPI2C1_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 99 // Configure I2C pins
<> 144:ef7eb2e8f9f7 100 pinmap_pinout(sda, PinMap_I2C_SDA);
<> 144:ef7eb2e8f9f7 101 pinmap_pinout(scl, PinMap_I2C_SCL);
<> 144:ef7eb2e8f9f7 102 pin_mode(sda, OpenDrain);
<> 144:ef7eb2e8f9f7 103 pin_mode(scl, OpenDrain);
<> 144:ef7eb2e8f9f7 104 }
<> 144:ef7eb2e8f9f7 105 #endif
<> 144:ef7eb2e8f9f7 106
<> 144:ef7eb2e8f9f7 107 // Reset to clear pending flags if any
<> 144:ef7eb2e8f9f7 108 i2c_reset(obj);
<> 144:ef7eb2e8f9f7 109
<> 144:ef7eb2e8f9f7 110 // I2C configuration
<> 144:ef7eb2e8f9f7 111 i2c_frequency(obj, 100000); // 100 kHz per default
<> 144:ef7eb2e8f9f7 112
<> 144:ef7eb2e8f9f7 113 // I2C master by default
<> 144:ef7eb2e8f9f7 114 obj->slave = 0;
<> 144:ef7eb2e8f9f7 115 }
<> 144:ef7eb2e8f9f7 116
<> 144:ef7eb2e8f9f7 117 void i2c_frequency(i2c_t *obj, int hz)
<> 144:ef7eb2e8f9f7 118 {
<> 144:ef7eb2e8f9f7 119 MBED_ASSERT((hz > 0) && (hz <= 400000));
<> 144:ef7eb2e8f9f7 120 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 121 int timeout;
<> 144:ef7eb2e8f9f7 122
<> 144:ef7eb2e8f9f7 123 // wait before init
<> 144:ef7eb2e8f9f7 124 timeout = LONG_TIMEOUT;
<> 144:ef7eb2e8f9f7 125 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
<> 144:ef7eb2e8f9f7 126
<> 144:ef7eb2e8f9f7 127 // I2C configuration
<> 144:ef7eb2e8f9f7 128 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
<> 144:ef7eb2e8f9f7 129 I2cHandle.Init.ClockSpeed = hz;
<> 144:ef7eb2e8f9f7 130 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
<> 144:ef7eb2e8f9f7 131 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
<> 144:ef7eb2e8f9f7 132 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
<> 144:ef7eb2e8f9f7 133 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
<> 144:ef7eb2e8f9f7 134 I2cHandle.Init.OwnAddress1 = 0;
<> 144:ef7eb2e8f9f7 135 I2cHandle.Init.OwnAddress2 = 0;
<> 144:ef7eb2e8f9f7 136 HAL_I2C_Init(&I2cHandle);
<> 144:ef7eb2e8f9f7 137 if (obj->slave) {
<> 144:ef7eb2e8f9f7 138 /* Enable Address Acknowledge */
<> 144:ef7eb2e8f9f7 139 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
<> 144:ef7eb2e8f9f7 140 }
<> 144:ef7eb2e8f9f7 141
<> 144:ef7eb2e8f9f7 142 }
<> 144:ef7eb2e8f9f7 143
<> 144:ef7eb2e8f9f7 144 inline int i2c_start(i2c_t *obj)
<> 144:ef7eb2e8f9f7 145 {
<> 144:ef7eb2e8f9f7 146 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 147 int timeout;
<> 144:ef7eb2e8f9f7 148
<> 144:ef7eb2e8f9f7 149 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 150
<> 144:ef7eb2e8f9f7 151 // Clear Acknowledge failure flag
<> 144:ef7eb2e8f9f7 152 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
<> 144:ef7eb2e8f9f7 153
<> 144:ef7eb2e8f9f7 154 // Wait the STOP condition has been previously correctly sent
<> 144:ef7eb2e8f9f7 155 // This timeout can be avoid in some specific cases by simply clearing the STOP bit
<> 144:ef7eb2e8f9f7 156 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 157 while ((i2c->CR1 & I2C_CR1_STOP) == I2C_CR1_STOP) {
<> 144:ef7eb2e8f9f7 158 if ((timeout--) == 0) {
<> 144:ef7eb2e8f9f7 159 return 1;
<> 144:ef7eb2e8f9f7 160 }
<> 144:ef7eb2e8f9f7 161 }
<> 144:ef7eb2e8f9f7 162
<> 144:ef7eb2e8f9f7 163 // Generate the START condition
<> 144:ef7eb2e8f9f7 164 i2c->CR1 |= I2C_CR1_START;
<> 144:ef7eb2e8f9f7 165
<> 144:ef7eb2e8f9f7 166 // Wait the START condition has been correctly sent
<> 144:ef7eb2e8f9f7 167 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 168 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
<> 144:ef7eb2e8f9f7 169 if ((timeout--) == 0) {
<> 144:ef7eb2e8f9f7 170 return 1;
<> 144:ef7eb2e8f9f7 171 }
<> 144:ef7eb2e8f9f7 172 }
<> 144:ef7eb2e8f9f7 173
<> 144:ef7eb2e8f9f7 174 return 0;
<> 144:ef7eb2e8f9f7 175 }
<> 144:ef7eb2e8f9f7 176
<> 144:ef7eb2e8f9f7 177 inline int i2c_stop(i2c_t *obj)
<> 144:ef7eb2e8f9f7 178 {
<> 144:ef7eb2e8f9f7 179 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 180
<> 144:ef7eb2e8f9f7 181 // Generate the STOP condition
<> 144:ef7eb2e8f9f7 182 i2c->CR1 |= I2C_CR1_STOP;
<> 144:ef7eb2e8f9f7 183
<> 144:ef7eb2e8f9f7 184 return 0;
<> 144:ef7eb2e8f9f7 185 }
<> 144:ef7eb2e8f9f7 186
<> 144:ef7eb2e8f9f7 187 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
<> 144:ef7eb2e8f9f7 188 {
<> 144:ef7eb2e8f9f7 189 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 190 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 191 int timeout;
<> 144:ef7eb2e8f9f7 192 int count;
<> 144:ef7eb2e8f9f7 193 int value;
<> 144:ef7eb2e8f9f7 194
<> 144:ef7eb2e8f9f7 195 i2c_start(obj);
<> 144:ef7eb2e8f9f7 196
<> 144:ef7eb2e8f9f7 197 // Wait until SB flag is set
<> 144:ef7eb2e8f9f7 198 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 199 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
<> 144:ef7eb2e8f9f7 200 timeout--;
<> 144:ef7eb2e8f9f7 201 if (timeout == 0) {
<> 144:ef7eb2e8f9f7 202 return -1;
<> 144:ef7eb2e8f9f7 203 }
<> 144:ef7eb2e8f9f7 204 }
<> 144:ef7eb2e8f9f7 205
<> 144:ef7eb2e8f9f7 206 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
<> 144:ef7eb2e8f9f7 207
<> 144:ef7eb2e8f9f7 208
<> 144:ef7eb2e8f9f7 209 // Wait address is acknowledged
<> 144:ef7eb2e8f9f7 210 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 211 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
<> 144:ef7eb2e8f9f7 212 timeout--;
<> 144:ef7eb2e8f9f7 213 if (timeout == 0) {
<> 144:ef7eb2e8f9f7 214 return -1;
<> 144:ef7eb2e8f9f7 215 }
<> 144:ef7eb2e8f9f7 216 }
<> 144:ef7eb2e8f9f7 217 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
<> 144:ef7eb2e8f9f7 218
<> 144:ef7eb2e8f9f7 219 // Read all bytes except last one
<> 144:ef7eb2e8f9f7 220 for (count = 0; count < (length - 1); count++) {
<> 144:ef7eb2e8f9f7 221 value = i2c_byte_read(obj, 0);
<> 144:ef7eb2e8f9f7 222 data[count] = (char)value;
<> 144:ef7eb2e8f9f7 223 }
<> 144:ef7eb2e8f9f7 224
<> 144:ef7eb2e8f9f7 225 // If not repeated start, send stop.
<> 144:ef7eb2e8f9f7 226 // Warning: must be done BEFORE the data is read.
<> 144:ef7eb2e8f9f7 227 if (stop) {
<> 144:ef7eb2e8f9f7 228 i2c_stop(obj);
<> 144:ef7eb2e8f9f7 229 }
<> 144:ef7eb2e8f9f7 230
<> 144:ef7eb2e8f9f7 231 // Read the last byte
<> 144:ef7eb2e8f9f7 232 value = i2c_byte_read(obj, 1);
<> 144:ef7eb2e8f9f7 233 data[count] = (char)value;
<> 144:ef7eb2e8f9f7 234
<> 144:ef7eb2e8f9f7 235 return length;
<> 144:ef7eb2e8f9f7 236 }
<> 144:ef7eb2e8f9f7 237
<> 144:ef7eb2e8f9f7 238 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
<> 144:ef7eb2e8f9f7 239 {
<> 144:ef7eb2e8f9f7 240 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 241 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 242 int timeout;
<> 144:ef7eb2e8f9f7 243 int count;
<> 144:ef7eb2e8f9f7 244
<> 144:ef7eb2e8f9f7 245 i2c_start(obj);
<> 144:ef7eb2e8f9f7 246
<> 144:ef7eb2e8f9f7 247 // Wait until SB flag is set
<> 144:ef7eb2e8f9f7 248 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 249 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
<> 144:ef7eb2e8f9f7 250 timeout--;
<> 144:ef7eb2e8f9f7 251 if (timeout == 0) {
<> 144:ef7eb2e8f9f7 252 return -1;
<> 144:ef7eb2e8f9f7 253 }
<> 144:ef7eb2e8f9f7 254 }
<> 144:ef7eb2e8f9f7 255
<> 144:ef7eb2e8f9f7 256 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
<> 144:ef7eb2e8f9f7 257
<> 144:ef7eb2e8f9f7 258
<> 144:ef7eb2e8f9f7 259 // Wait address is acknowledged
<> 144:ef7eb2e8f9f7 260 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 261 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
<> 144:ef7eb2e8f9f7 262 timeout--;
<> 144:ef7eb2e8f9f7 263 if (timeout == 0) {
<> 144:ef7eb2e8f9f7 264 return -1;
<> 144:ef7eb2e8f9f7 265 }
<> 144:ef7eb2e8f9f7 266 }
<> 144:ef7eb2e8f9f7 267 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
<> 144:ef7eb2e8f9f7 268
<> 144:ef7eb2e8f9f7 269 for (count = 0; count < length; count++) {
<> 144:ef7eb2e8f9f7 270 if (i2c_byte_write(obj, data[count]) != 1) {
<> 144:ef7eb2e8f9f7 271 i2c_stop(obj);
<> 144:ef7eb2e8f9f7 272 return -1;
<> 144:ef7eb2e8f9f7 273 }
<> 144:ef7eb2e8f9f7 274 }
<> 144:ef7eb2e8f9f7 275
<> 144:ef7eb2e8f9f7 276 // If not repeated start, send stop.
<> 144:ef7eb2e8f9f7 277 if (stop) {
<> 144:ef7eb2e8f9f7 278 i2c_stop(obj);
<> 144:ef7eb2e8f9f7 279 }
<> 144:ef7eb2e8f9f7 280
<> 144:ef7eb2e8f9f7 281 return count;
<> 144:ef7eb2e8f9f7 282 }
<> 144:ef7eb2e8f9f7 283
<> 144:ef7eb2e8f9f7 284 int i2c_byte_read(i2c_t *obj, int last)
<> 144:ef7eb2e8f9f7 285 {
<> 144:ef7eb2e8f9f7 286 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 287 int timeout;
<> 144:ef7eb2e8f9f7 288
<> 144:ef7eb2e8f9f7 289 if (last) {
<> 144:ef7eb2e8f9f7 290 // Don't acknowledge the last byte
<> 144:ef7eb2e8f9f7 291 i2c->CR1 &= ~I2C_CR1_ACK;
<> 144:ef7eb2e8f9f7 292 } else {
<> 144:ef7eb2e8f9f7 293 // Acknowledge the byte
<> 144:ef7eb2e8f9f7 294 i2c->CR1 |= I2C_CR1_ACK;
<> 144:ef7eb2e8f9f7 295 }
<> 144:ef7eb2e8f9f7 296
<> 144:ef7eb2e8f9f7 297 // Wait until the byte is received
<> 144:ef7eb2e8f9f7 298 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 299 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
<> 144:ef7eb2e8f9f7 300 if ((timeout--) == 0) {
<> 144:ef7eb2e8f9f7 301 return -1;
<> 144:ef7eb2e8f9f7 302 }
<> 144:ef7eb2e8f9f7 303 }
<> 144:ef7eb2e8f9f7 304
<> 144:ef7eb2e8f9f7 305 return (int)i2c->DR;
<> 144:ef7eb2e8f9f7 306 }
<> 144:ef7eb2e8f9f7 307
<> 144:ef7eb2e8f9f7 308 int i2c_byte_write(i2c_t *obj, int data)
<> 144:ef7eb2e8f9f7 309 {
<> 144:ef7eb2e8f9f7 310 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 311 int timeout;
<> 144:ef7eb2e8f9f7 312
<> 144:ef7eb2e8f9f7 313 i2c->DR = (uint8_t)data;
<> 144:ef7eb2e8f9f7 314
<> 144:ef7eb2e8f9f7 315 // Wait until the byte is transmitted
<> 144:ef7eb2e8f9f7 316 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 317 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
<> 144:ef7eb2e8f9f7 318 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
<> 144:ef7eb2e8f9f7 319 if ((timeout--) == 0) {
<> 144:ef7eb2e8f9f7 320 return 0;
<> 144:ef7eb2e8f9f7 321 }
<> 144:ef7eb2e8f9f7 322 }
<> 144:ef7eb2e8f9f7 323
<> 144:ef7eb2e8f9f7 324 return 1;
<> 144:ef7eb2e8f9f7 325 }
<> 144:ef7eb2e8f9f7 326
<> 144:ef7eb2e8f9f7 327 void i2c_reset(i2c_t *obj)
<> 144:ef7eb2e8f9f7 328 {
<> 144:ef7eb2e8f9f7 329 int timeout;
<> 144:ef7eb2e8f9f7 330
<> 144:ef7eb2e8f9f7 331 // wait before reset
<> 144:ef7eb2e8f9f7 332 timeout = LONG_TIMEOUT;
<> 144:ef7eb2e8f9f7 333 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
<> 144:ef7eb2e8f9f7 334
<> 144:ef7eb2e8f9f7 335 if (obj->i2c == I2C_1) {
<> 144:ef7eb2e8f9f7 336 __I2C1_FORCE_RESET();
<> 144:ef7eb2e8f9f7 337 __I2C1_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 338 }
<> 144:ef7eb2e8f9f7 339 if (obj->i2c == I2C_2) {
<> 144:ef7eb2e8f9f7 340 __I2C2_FORCE_RESET();
<> 144:ef7eb2e8f9f7 341 __I2C2_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 342 }
<> 144:ef7eb2e8f9f7 343 #if defined I2C3_BASE
<> 144:ef7eb2e8f9f7 344 if (obj->i2c == I2C_3) {
<> 144:ef7eb2e8f9f7 345 __I2C3_FORCE_RESET();
<> 144:ef7eb2e8f9f7 346 __I2C3_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 347 }
<> 144:ef7eb2e8f9f7 348 #endif
<> 144:ef7eb2e8f9f7 349
<> 144:ef7eb2e8f9f7 350 #if defined FMPI2C1_BASE
<> 144:ef7eb2e8f9f7 351 if (obj->i2c == FMPI2C_1) {
<> 144:ef7eb2e8f9f7 352 __HAL_RCC_FMPI2C1_FORCE_RESET();
<> 144:ef7eb2e8f9f7 353 __HAL_RCC_FMPI2C1_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 354 }
<> 144:ef7eb2e8f9f7 355 #endif
<> 144:ef7eb2e8f9f7 356 }
<> 144:ef7eb2e8f9f7 357
<> 144:ef7eb2e8f9f7 358 #if DEVICE_I2CSLAVE
<> 144:ef7eb2e8f9f7 359
<> 144:ef7eb2e8f9f7 360 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
<> 144:ef7eb2e8f9f7 361 {
<> 144:ef7eb2e8f9f7 362 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 363 uint16_t tmpreg = 0;
<> 144:ef7eb2e8f9f7 364
<> 144:ef7eb2e8f9f7 365 // Get the old register value
<> 144:ef7eb2e8f9f7 366 tmpreg = i2c->OAR1;
<> 144:ef7eb2e8f9f7 367 // Reset address bits
<> 144:ef7eb2e8f9f7 368 tmpreg &= 0xFC00;
<> 144:ef7eb2e8f9f7 369 // Set new address
<> 144:ef7eb2e8f9f7 370 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
<> 144:ef7eb2e8f9f7 371 // Store the new register value
<> 144:ef7eb2e8f9f7 372 i2c->OAR1 = tmpreg;
<> 144:ef7eb2e8f9f7 373 }
<> 144:ef7eb2e8f9f7 374
<> 144:ef7eb2e8f9f7 375 void i2c_slave_mode(i2c_t *obj, int enable_slave)
<> 144:ef7eb2e8f9f7 376 {
<> 144:ef7eb2e8f9f7 377 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 378 if (enable_slave) {
<> 144:ef7eb2e8f9f7 379 obj->slave = 1;
<> 144:ef7eb2e8f9f7 380 /* Enable Address Acknowledge */
<> 144:ef7eb2e8f9f7 381 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
<> 144:ef7eb2e8f9f7 382 }
<> 144:ef7eb2e8f9f7 383 }
<> 144:ef7eb2e8f9f7 384
<> 144:ef7eb2e8f9f7 385 // See I2CSlave.h
<> 144:ef7eb2e8f9f7 386 #define NoData 0 // the slave has not been addressed
<> 144:ef7eb2e8f9f7 387 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
<> 144:ef7eb2e8f9f7 388 #define WriteGeneral 2 // the master is writing to all slave
<> 144:ef7eb2e8f9f7 389 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
<> 144:ef7eb2e8f9f7 390
<> 144:ef7eb2e8f9f7 391 int i2c_slave_receive(i2c_t *obj)
<> 144:ef7eb2e8f9f7 392 {
<> 144:ef7eb2e8f9f7 393 int retValue = NoData;
<> 144:ef7eb2e8f9f7 394
<> 144:ef7eb2e8f9f7 395 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
<> 144:ef7eb2e8f9f7 396 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
<> 144:ef7eb2e8f9f7 397 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1)
<> 144:ef7eb2e8f9f7 398 retValue = ReadAddressed;
<> 144:ef7eb2e8f9f7 399 else
<> 144:ef7eb2e8f9f7 400 retValue = WriteAddressed;
<> 144:ef7eb2e8f9f7 401
<> 144:ef7eb2e8f9f7 402 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
<> 144:ef7eb2e8f9f7 403 }
<> 144:ef7eb2e8f9f7 404 }
<> 144:ef7eb2e8f9f7 405
<> 144:ef7eb2e8f9f7 406 return (retValue);
<> 144:ef7eb2e8f9f7 407 }
<> 144:ef7eb2e8f9f7 408
<> 144:ef7eb2e8f9f7 409 int i2c_slave_read(i2c_t *obj, char *data, int length)
<> 144:ef7eb2e8f9f7 410 {
<> 144:ef7eb2e8f9f7 411 uint32_t Timeout;
<> 144:ef7eb2e8f9f7 412 int size = 0;
<> 144:ef7eb2e8f9f7 413
<> 144:ef7eb2e8f9f7 414 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 415
<> 144:ef7eb2e8f9f7 416 while (length > 0) {
<> 144:ef7eb2e8f9f7 417 /* Wait until RXNE flag is set */
<> 144:ef7eb2e8f9f7 418 // Wait until the byte is received
<> 144:ef7eb2e8f9f7 419 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 420 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
<> 144:ef7eb2e8f9f7 421 Timeout--;
<> 144:ef7eb2e8f9f7 422 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 423 return -1;
<> 144:ef7eb2e8f9f7 424 }
<> 144:ef7eb2e8f9f7 425 }
<> 144:ef7eb2e8f9f7 426
<> 144:ef7eb2e8f9f7 427 /* Read data from DR */
<> 144:ef7eb2e8f9f7 428 (*data++) = I2cHandle.Instance->DR;
<> 144:ef7eb2e8f9f7 429 length--;
<> 144:ef7eb2e8f9f7 430 size++;
<> 144:ef7eb2e8f9f7 431
<> 144:ef7eb2e8f9f7 432 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
<> 144:ef7eb2e8f9f7 433 /* Read data from DR */
<> 144:ef7eb2e8f9f7 434 (*data++) = I2cHandle.Instance->DR;
<> 144:ef7eb2e8f9f7 435 length--;
<> 144:ef7eb2e8f9f7 436 size++;
<> 144:ef7eb2e8f9f7 437 }
<> 144:ef7eb2e8f9f7 438 }
<> 144:ef7eb2e8f9f7 439
<> 144:ef7eb2e8f9f7 440 /* Wait until STOP flag is set */
<> 144:ef7eb2e8f9f7 441 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 442 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
<> 144:ef7eb2e8f9f7 443 Timeout--;
<> 144:ef7eb2e8f9f7 444 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 445 return -1;
<> 144:ef7eb2e8f9f7 446 }
<> 144:ef7eb2e8f9f7 447 }
<> 144:ef7eb2e8f9f7 448
<> 144:ef7eb2e8f9f7 449 /* Clear STOP flag */
<> 144:ef7eb2e8f9f7 450 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
<> 144:ef7eb2e8f9f7 451
<> 144:ef7eb2e8f9f7 452 /* Wait until BUSY flag is reset */
<> 144:ef7eb2e8f9f7 453 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 454 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
<> 144:ef7eb2e8f9f7 455 Timeout--;
<> 144:ef7eb2e8f9f7 456 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 457 return -1;
<> 144:ef7eb2e8f9f7 458 }
<> 144:ef7eb2e8f9f7 459 }
<> 144:ef7eb2e8f9f7 460
<> 144:ef7eb2e8f9f7 461 return size;
<> 144:ef7eb2e8f9f7 462 }
<> 144:ef7eb2e8f9f7 463
<> 144:ef7eb2e8f9f7 464 int i2c_slave_write(i2c_t *obj, const char *data, int length)
<> 144:ef7eb2e8f9f7 465 {
<> 144:ef7eb2e8f9f7 466 uint32_t Timeout;
<> 144:ef7eb2e8f9f7 467 int size = 0;
<> 144:ef7eb2e8f9f7 468
<> 144:ef7eb2e8f9f7 469 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 470
<> 144:ef7eb2e8f9f7 471 while (length > 0) {
<> 144:ef7eb2e8f9f7 472 /* Wait until TXE flag is set */
<> 144:ef7eb2e8f9f7 473 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 474 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
<> 144:ef7eb2e8f9f7 475 Timeout--;
<> 144:ef7eb2e8f9f7 476 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 477 return -1;
<> 144:ef7eb2e8f9f7 478 }
<> 144:ef7eb2e8f9f7 479 }
<> 144:ef7eb2e8f9f7 480
<> 144:ef7eb2e8f9f7 481
<> 144:ef7eb2e8f9f7 482 /* Write data to DR */
<> 144:ef7eb2e8f9f7 483 I2cHandle.Instance->DR = (*data++);
<> 144:ef7eb2e8f9f7 484 length--;
<> 144:ef7eb2e8f9f7 485 size++;
<> 144:ef7eb2e8f9f7 486
<> 144:ef7eb2e8f9f7 487 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
<> 144:ef7eb2e8f9f7 488 /* Write data to DR */
<> 144:ef7eb2e8f9f7 489 I2cHandle.Instance->DR = (*data++);
<> 144:ef7eb2e8f9f7 490 length--;
<> 144:ef7eb2e8f9f7 491 size++;
<> 144:ef7eb2e8f9f7 492 }
<> 144:ef7eb2e8f9f7 493 }
<> 144:ef7eb2e8f9f7 494
<> 144:ef7eb2e8f9f7 495 /* Wait until AF flag is set */
<> 144:ef7eb2e8f9f7 496 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 497 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
<> 144:ef7eb2e8f9f7 498 Timeout--;
<> 144:ef7eb2e8f9f7 499 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 500 return -1;
<> 144:ef7eb2e8f9f7 501 }
<> 144:ef7eb2e8f9f7 502 }
<> 144:ef7eb2e8f9f7 503
<> 144:ef7eb2e8f9f7 504
<> 144:ef7eb2e8f9f7 505 /* Clear AF flag */
<> 144:ef7eb2e8f9f7 506 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
<> 144:ef7eb2e8f9f7 507
<> 144:ef7eb2e8f9f7 508
<> 144:ef7eb2e8f9f7 509 /* Wait until BUSY flag is reset */
<> 144:ef7eb2e8f9f7 510 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 511 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
<> 144:ef7eb2e8f9f7 512 Timeout--;
<> 144:ef7eb2e8f9f7 513 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 514 return -1;
<> 144:ef7eb2e8f9f7 515 }
<> 144:ef7eb2e8f9f7 516 }
<> 144:ef7eb2e8f9f7 517
<> 144:ef7eb2e8f9f7 518 I2cHandle.State = HAL_I2C_STATE_READY;
<> 144:ef7eb2e8f9f7 519
<> 144:ef7eb2e8f9f7 520 /* Process Unlocked */
<> 144:ef7eb2e8f9f7 521 __HAL_UNLOCK(&I2cHandle);
<> 144:ef7eb2e8f9f7 522
<> 144:ef7eb2e8f9f7 523 return size;
<> 144:ef7eb2e8f9f7 524 }
<> 144:ef7eb2e8f9f7 525
<> 144:ef7eb2e8f9f7 526
<> 144:ef7eb2e8f9f7 527 #endif // DEVICE_I2CSLAVE
<> 144:ef7eb2e8f9f7 528
<> 144:ef7eb2e8f9f7 529 #endif // DEVICE_I2C