Marek Trojan / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32F1/i2c_api.c@151:02e0a0aed4ec, 2016-11-08 (annotated)

Committer:
<>
Date:
Tue Nov 08 17:45:16 2016 +0000
Revision:
151:02e0a0aed4ec
Parent:
149:156823d33999 
This updates the lib to the mbed lib v129

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) 2014, 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 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
<> 144:ef7eb2e8f9f7 48 {
<> 144:ef7eb2e8f9f7 49 static int i2c1_inited = 0;
<> 144:ef7eb2e8f9f7 50 static int i2c2_inited = 0;
<> 144:ef7eb2e8f9f7 51
<> 144:ef7eb2e8f9f7 52 // Determine the I2C to use
<> 144:ef7eb2e8f9f7 53 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
<> 144:ef7eb2e8f9f7 54 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
<> 144:ef7eb2e8f9f7 55
<> 144:ef7eb2e8f9f7 56 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
<> 144:ef7eb2e8f9f7 57 MBED_ASSERT(obj->i2c != (I2CName)NC);
<> 144:ef7eb2e8f9f7 58
<> 144:ef7eb2e8f9f7 59 // Check if I2C peripherals are already configured
<> 144:ef7eb2e8f9f7 60 if ((obj->i2c == I2C_1) && i2c1_inited) return;
<> 144:ef7eb2e8f9f7 61 if ((obj->i2c == I2C_2) && i2c2_inited) return;
<> 144:ef7eb2e8f9f7 62
<> 144:ef7eb2e8f9f7 63 // Set I2C clock
<> 144:ef7eb2e8f9f7 64 if (obj->i2c == I2C_1) {
<> 144:ef7eb2e8f9f7 65 i2c1_inited = 1;
<> 144:ef7eb2e8f9f7 66 __I2C1_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 67 }
<> 144:ef7eb2e8f9f7 68
<> 144:ef7eb2e8f9f7 69 if (obj->i2c == I2C_2) {
<> 144:ef7eb2e8f9f7 70 i2c2_inited = 1;
<> 144:ef7eb2e8f9f7 71 __I2C2_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 72 }
<> 144:ef7eb2e8f9f7 73
<> 144:ef7eb2e8f9f7 74 // Configure I2C pins
<> 144:ef7eb2e8f9f7 75 pinmap_pinout(sda, PinMap_I2C_SDA);
<> 144:ef7eb2e8f9f7 76 pinmap_pinout(scl, PinMap_I2C_SCL);
<> 144:ef7eb2e8f9f7 77 pin_mode(sda, OpenDrain);
<> 144:ef7eb2e8f9f7 78 pin_mode(scl, OpenDrain);
<> 144:ef7eb2e8f9f7 79
<> 144:ef7eb2e8f9f7 80 // Reset to clear pending flags if any
<> 144:ef7eb2e8f9f7 81 i2c_reset(obj);
<> 144:ef7eb2e8f9f7 82
<> 144:ef7eb2e8f9f7 83 // I2C configuration
<> 144:ef7eb2e8f9f7 84 i2c_frequency(obj, 100000); // 100 kHz per default
<> 144:ef7eb2e8f9f7 85
<> 144:ef7eb2e8f9f7 86 // I2C master by default
<> 144:ef7eb2e8f9f7 87 obj->slave = 0;
<> 144:ef7eb2e8f9f7 88 }
<> 144:ef7eb2e8f9f7 89
<> 144:ef7eb2e8f9f7 90 void i2c_frequency(i2c_t *obj, int hz)
<> 144:ef7eb2e8f9f7 91 {
<> 144:ef7eb2e8f9f7 92 MBED_ASSERT((hz != 0) && (hz <= 400000));
<> 144:ef7eb2e8f9f7 93 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 94 int timeout;
<> 144:ef7eb2e8f9f7 95
<> 144:ef7eb2e8f9f7 96 // wait before init
<> 144:ef7eb2e8f9f7 97 timeout = LONG_TIMEOUT;
<> 144:ef7eb2e8f9f7 98 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
<> 144:ef7eb2e8f9f7 99
<> 144:ef7eb2e8f9f7 100 // I2C configuration
<> 144:ef7eb2e8f9f7 101 I2cHandle.Init.ClockSpeed = hz;
<> 144:ef7eb2e8f9f7 102 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
<> 144:ef7eb2e8f9f7 103 I2cHandle.Init.OwnAddress1 = 0;
<> 144:ef7eb2e8f9f7 104 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
<> 144:ef7eb2e8f9f7 105 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
<> 144:ef7eb2e8f9f7 106 I2cHandle.Init.OwnAddress2 = 0;
<> 144:ef7eb2e8f9f7 107 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
<> 144:ef7eb2e8f9f7 108 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
<> 144:ef7eb2e8f9f7 109 HAL_I2C_Init(&I2cHandle);
<> 144:ef7eb2e8f9f7 110
<> 144:ef7eb2e8f9f7 111 if (obj->slave) {
<> 144:ef7eb2e8f9f7 112 // Enable Address Acknowledge
<> 144:ef7eb2e8f9f7 113 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
<> 144:ef7eb2e8f9f7 114 }
<> 144:ef7eb2e8f9f7 115 }
<> 144:ef7eb2e8f9f7 116
<> 144:ef7eb2e8f9f7 117 inline int i2c_start(i2c_t *obj)
<> 144:ef7eb2e8f9f7 118 {
<> 144:ef7eb2e8f9f7 119 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 120 int timeout;
<> 144:ef7eb2e8f9f7 121
<> 144:ef7eb2e8f9f7 122 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 123
<> 144:ef7eb2e8f9f7 124 // Clear Acknowledge failure flag
<> 144:ef7eb2e8f9f7 125 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
<> 144:ef7eb2e8f9f7 126
<> 144:ef7eb2e8f9f7 127 // Wait the STOP condition has been previously correctly sent
<> 144:ef7eb2e8f9f7 128 // This timeout can be avoid in some specific cases by simply clearing the STOP bit
<> 144:ef7eb2e8f9f7 129 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 130 while ((i2c->CR1 & I2C_CR1_STOP) == I2C_CR1_STOP) {
<> 144:ef7eb2e8f9f7 131 if ((timeout--) == 0) {
<> 144:ef7eb2e8f9f7 132 return 1;
<> 144:ef7eb2e8f9f7 133 }
<> 144:ef7eb2e8f9f7 134 }
<> 144:ef7eb2e8f9f7 135
<> 144:ef7eb2e8f9f7 136 // Generate the START condition
<> 144:ef7eb2e8f9f7 137 i2c->CR1 |= I2C_CR1_START;
<> 144:ef7eb2e8f9f7 138
<> 144:ef7eb2e8f9f7 139 // Wait the START condition has been correctly sent
<> 144:ef7eb2e8f9f7 140 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 141 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
<> 144:ef7eb2e8f9f7 142 if ((timeout--) == 0) {
<> 144:ef7eb2e8f9f7 143 return 1;
<> 144:ef7eb2e8f9f7 144 }
<> 144:ef7eb2e8f9f7 145 }
<> 144:ef7eb2e8f9f7 146
<> 144:ef7eb2e8f9f7 147 return 0;
<> 144:ef7eb2e8f9f7 148 }
<> 144:ef7eb2e8f9f7 149
<> 144:ef7eb2e8f9f7 150 inline int i2c_stop(i2c_t *obj)
<> 144:ef7eb2e8f9f7 151 {
<> 144:ef7eb2e8f9f7 152 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 153
<> 144:ef7eb2e8f9f7 154 // Generate the STOP condition
<> 144:ef7eb2e8f9f7 155 i2c->CR1 |= I2C_CR1_STOP;
<> 144:ef7eb2e8f9f7 156
<> 144:ef7eb2e8f9f7 157 return 0;
<> 144:ef7eb2e8f9f7 158 }
<> 144:ef7eb2e8f9f7 159
<> 144:ef7eb2e8f9f7 160 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
<> 144:ef7eb2e8f9f7 161 {
<> 144:ef7eb2e8f9f7 162 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 163 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 164 int timeout;
<> 144:ef7eb2e8f9f7 165 int count;
<> 144:ef7eb2e8f9f7 166 int value;
<> 144:ef7eb2e8f9f7 167
<> 144:ef7eb2e8f9f7 168 // Generate start condition
<> 144:ef7eb2e8f9f7 169 i2c_start(obj);
<> 144:ef7eb2e8f9f7 170
<> 144:ef7eb2e8f9f7 171 // Send address for read
<> 144:ef7eb2e8f9f7 172 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
<> 144:ef7eb2e8f9f7 173
<> 144:ef7eb2e8f9f7 174 // Wait address is acknowledged
<> 144:ef7eb2e8f9f7 175 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 176 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
<> 144:ef7eb2e8f9f7 177 timeout--;
<> 144:ef7eb2e8f9f7 178 if (timeout == 0) {
<> 144:ef7eb2e8f9f7 179 return -1;
<> 144:ef7eb2e8f9f7 180 }
<> 144:ef7eb2e8f9f7 181 }
<> 144:ef7eb2e8f9f7 182 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
<> 144:ef7eb2e8f9f7 183
<> 144:ef7eb2e8f9f7 184 // Read all bytes except last one
<> 144:ef7eb2e8f9f7 185 for (count = 0; count < (length - 1); count++) {
<> 144:ef7eb2e8f9f7 186 value = i2c_byte_read(obj, 0);
<> 144:ef7eb2e8f9f7 187 data[count] = (char)value;
<> 144:ef7eb2e8f9f7 188 }
<> 144:ef7eb2e8f9f7 189
<> 144:ef7eb2e8f9f7 190 // If not repeated start, send stop.
<> 144:ef7eb2e8f9f7 191 // Warning: must be done BEFORE the data is read.
<> 144:ef7eb2e8f9f7 192 if (stop) {
<> 144:ef7eb2e8f9f7 193 i2c_stop(obj);
<> 144:ef7eb2e8f9f7 194 }
<> 144:ef7eb2e8f9f7 195
<> 144:ef7eb2e8f9f7 196 // Read the last byte
<> 144:ef7eb2e8f9f7 197 value = i2c_byte_read(obj, 1);
<> 144:ef7eb2e8f9f7 198 data[count] = (char)value;
<> 144:ef7eb2e8f9f7 199
<> 144:ef7eb2e8f9f7 200 return length;
<> 144:ef7eb2e8f9f7 201 }
<> 144:ef7eb2e8f9f7 202
<> 144:ef7eb2e8f9f7 203 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
<> 144:ef7eb2e8f9f7 204 {
<> 144:ef7eb2e8f9f7 205 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 206 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 207 int timeout;
<> 144:ef7eb2e8f9f7 208 int count;
<> 144:ef7eb2e8f9f7 209
<> 144:ef7eb2e8f9f7 210 // Generate start condition
<> 144:ef7eb2e8f9f7 211 i2c_start(obj);
<> 144:ef7eb2e8f9f7 212
<> 144:ef7eb2e8f9f7 213 // Send address for write
<> 144:ef7eb2e8f9f7 214 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
<> 144:ef7eb2e8f9f7 215
<> 144:ef7eb2e8f9f7 216 // Wait address is acknowledged
<> 144:ef7eb2e8f9f7 217 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 218 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
<> 144:ef7eb2e8f9f7 219 timeout--;
<> 144:ef7eb2e8f9f7 220 if (timeout == 0) {
<> 144:ef7eb2e8f9f7 221 return -1;
<> 144:ef7eb2e8f9f7 222 }
<> 144:ef7eb2e8f9f7 223 }
<> 144:ef7eb2e8f9f7 224 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
<> 144:ef7eb2e8f9f7 225
<> 144:ef7eb2e8f9f7 226 // Write all bytes
<> 144:ef7eb2e8f9f7 227 for (count = 0; count < length; count++) {
<> 144:ef7eb2e8f9f7 228 if (i2c_byte_write(obj, data[count]) != 1) {
<> 144:ef7eb2e8f9f7 229 i2c_stop(obj);
<> 144:ef7eb2e8f9f7 230 return -1;
<> 144:ef7eb2e8f9f7 231 }
<> 144:ef7eb2e8f9f7 232 }
<> 144:ef7eb2e8f9f7 233
<> 144:ef7eb2e8f9f7 234 // If not repeated start, send stop.
<> 144:ef7eb2e8f9f7 235 if (stop) {
<> 144:ef7eb2e8f9f7 236 i2c_stop(obj);
<> 144:ef7eb2e8f9f7 237 }
<> 144:ef7eb2e8f9f7 238
<> 144:ef7eb2e8f9f7 239 return count;
<> 144:ef7eb2e8f9f7 240 }
<> 144:ef7eb2e8f9f7 241
<> 144:ef7eb2e8f9f7 242 int i2c_byte_read(i2c_t *obj, int last)
<> 144:ef7eb2e8f9f7 243 {
<> 144:ef7eb2e8f9f7 244 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 245 int timeout;
<> 144:ef7eb2e8f9f7 246
<> 144:ef7eb2e8f9f7 247 if (last) {
<> 144:ef7eb2e8f9f7 248 // Don't acknowledge the last byte
<> 144:ef7eb2e8f9f7 249 i2c->CR1 &= ~I2C_CR1_ACK;
<> 144:ef7eb2e8f9f7 250 } else {
<> 144:ef7eb2e8f9f7 251 // Acknowledge the byte
<> 144:ef7eb2e8f9f7 252 i2c->CR1 |= I2C_CR1_ACK;
<> 144:ef7eb2e8f9f7 253 }
<> 144:ef7eb2e8f9f7 254
<> 144:ef7eb2e8f9f7 255 // Wait until the byte is received
<> 144:ef7eb2e8f9f7 256 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 257 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
<> 144:ef7eb2e8f9f7 258 if ((timeout--) == 0) {
<> 144:ef7eb2e8f9f7 259 return -1;
<> 144:ef7eb2e8f9f7 260 }
<> 144:ef7eb2e8f9f7 261 }
<> 144:ef7eb2e8f9f7 262
<> 144:ef7eb2e8f9f7 263 return (int)i2c->DR;
<> 144:ef7eb2e8f9f7 264 }
<> 144:ef7eb2e8f9f7 265
<> 144:ef7eb2e8f9f7 266 int i2c_byte_write(i2c_t *obj, int data)
<> 144:ef7eb2e8f9f7 267 {
<> 144:ef7eb2e8f9f7 268 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 269 int timeout;
<> 144:ef7eb2e8f9f7 270
<> 144:ef7eb2e8f9f7 271 i2c->DR = (uint8_t)data;
<> 144:ef7eb2e8f9f7 272
<> 144:ef7eb2e8f9f7 273 // Wait until the byte is transmitted
<> 144:ef7eb2e8f9f7 274 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 275 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
<> 144:ef7eb2e8f9f7 276 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
<> 144:ef7eb2e8f9f7 277 if ((timeout--) == 0) {
<> 144:ef7eb2e8f9f7 278 return 0;
<> 144:ef7eb2e8f9f7 279 }
<> 144:ef7eb2e8f9f7 280 }
<> 144:ef7eb2e8f9f7 281
<> 144:ef7eb2e8f9f7 282 return 1;
<> 144:ef7eb2e8f9f7 283 }
<> 144:ef7eb2e8f9f7 284
<> 144:ef7eb2e8f9f7 285 void i2c_reset(i2c_t *obj)
<> 144:ef7eb2e8f9f7 286 {
<> 144:ef7eb2e8f9f7 287 int timeout;
<> 144:ef7eb2e8f9f7 288
<> 144:ef7eb2e8f9f7 289 // Wait before reset
<> 144:ef7eb2e8f9f7 290 timeout = LONG_TIMEOUT;
<> 144:ef7eb2e8f9f7 291 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
<> 144:ef7eb2e8f9f7 292
<> 144:ef7eb2e8f9f7 293 if (obj->i2c == I2C_1) {
<> 144:ef7eb2e8f9f7 294 __I2C1_FORCE_RESET();
<> 144:ef7eb2e8f9f7 295 __I2C1_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 296 }
<> 144:ef7eb2e8f9f7 297
<> 144:ef7eb2e8f9f7 298 if (obj->i2c == I2C_2) {
<> 144:ef7eb2e8f9f7 299 __I2C2_FORCE_RESET();
<> 144:ef7eb2e8f9f7 300 __I2C2_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 301 }
<> 144:ef7eb2e8f9f7 302 }
<> 144:ef7eb2e8f9f7 303
<> 144:ef7eb2e8f9f7 304 #if DEVICE_I2CSLAVE
<> 144:ef7eb2e8f9f7 305
<> 144:ef7eb2e8f9f7 306 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
<> 144:ef7eb2e8f9f7 307 {
<> 144:ef7eb2e8f9f7 308 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 309 uint16_t tmpreg = 0;
<> 144:ef7eb2e8f9f7 310
<> 144:ef7eb2e8f9f7 311 // Get the old register value
<> 144:ef7eb2e8f9f7 312 tmpreg = i2c->OAR1;
<> 144:ef7eb2e8f9f7 313 // Reset address bits
<> 144:ef7eb2e8f9f7 314 tmpreg &= 0xFC00;
<> 144:ef7eb2e8f9f7 315 // Set new address
<> 144:ef7eb2e8f9f7 316 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
<> 144:ef7eb2e8f9f7 317 // Store the new register value
<> 144:ef7eb2e8f9f7 318 i2c->OAR1 = tmpreg;
<> 144:ef7eb2e8f9f7 319 }
<> 144:ef7eb2e8f9f7 320
<> 144:ef7eb2e8f9f7 321 void i2c_slave_mode(i2c_t *obj, int enable_slave)
<> 144:ef7eb2e8f9f7 322 {
<> 144:ef7eb2e8f9f7 323 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 324 if (enable_slave) {
<> 144:ef7eb2e8f9f7 325 obj->slave = 1;
<> 144:ef7eb2e8f9f7 326 /* Enable Address Acknowledge */
<> 144:ef7eb2e8f9f7 327 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
<> 144:ef7eb2e8f9f7 328 }
<> 144:ef7eb2e8f9f7 329 }
<> 144:ef7eb2e8f9f7 330
<> 144:ef7eb2e8f9f7 331 // See I2CSlave.h
<> 144:ef7eb2e8f9f7 332 #define NoData 0 // the slave has not been addressed
<> 144:ef7eb2e8f9f7 333 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
<> 144:ef7eb2e8f9f7 334 #define WriteGeneral 2 // the master is writing to all slave
<> 144:ef7eb2e8f9f7 335 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
<> 144:ef7eb2e8f9f7 336
<> 144:ef7eb2e8f9f7 337 int i2c_slave_receive(i2c_t *obj)
<> 144:ef7eb2e8f9f7 338 {
<> 144:ef7eb2e8f9f7 339 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 340 int retValue = NoData;
<> 144:ef7eb2e8f9f7 341
<> 144:ef7eb2e8f9f7 342 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
<> 144:ef7eb2e8f9f7 343 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
<> 144:ef7eb2e8f9f7 344 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1) {
<> 144:ef7eb2e8f9f7 345 retValue = ReadAddressed;
<> 144:ef7eb2e8f9f7 346 } else {
<> 144:ef7eb2e8f9f7 347 retValue = WriteAddressed;
<> 144:ef7eb2e8f9f7 348 }
<> 144:ef7eb2e8f9f7 349 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
<> 144:ef7eb2e8f9f7 350 }
<> 144:ef7eb2e8f9f7 351 }
<> 144:ef7eb2e8f9f7 352
<> 144:ef7eb2e8f9f7 353 return (retValue);
<> 144:ef7eb2e8f9f7 354 }
<> 144:ef7eb2e8f9f7 355
<> 144:ef7eb2e8f9f7 356 int i2c_slave_read(i2c_t *obj, char *data, int length)
<> 144:ef7eb2e8f9f7 357 {
<> 144:ef7eb2e8f9f7 358 uint32_t Timeout;
<> 144:ef7eb2e8f9f7 359 int size = 0;
<> 144:ef7eb2e8f9f7 360
<> 144:ef7eb2e8f9f7 361 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 362
<> 144:ef7eb2e8f9f7 363 while (length > 0) {
<> 144:ef7eb2e8f9f7 364 // Wait until RXNE flag is set
<> 144:ef7eb2e8f9f7 365 // Wait until the byte is received
<> 144:ef7eb2e8f9f7 366 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 367 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
<> 144:ef7eb2e8f9f7 368 Timeout--;
<> 144:ef7eb2e8f9f7 369 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 370 return -1;
<> 144:ef7eb2e8f9f7 371 }
<> 144:ef7eb2e8f9f7 372 }
<> 144:ef7eb2e8f9f7 373
<> 144:ef7eb2e8f9f7 374 // Read data
<> 144:ef7eb2e8f9f7 375 (*data++) = I2cHandle.Instance->DR;
<> 144:ef7eb2e8f9f7 376 length--;
<> 144:ef7eb2e8f9f7 377 size++;
<> 144:ef7eb2e8f9f7 378
<> 144:ef7eb2e8f9f7 379 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
<> 144:ef7eb2e8f9f7 380 // Read data
<> 144:ef7eb2e8f9f7 381 (*data++) = I2cHandle.Instance->DR;
<> 144:ef7eb2e8f9f7 382 length--;
<> 144:ef7eb2e8f9f7 383 size++;
<> 144:ef7eb2e8f9f7 384 }
<> 144:ef7eb2e8f9f7 385 }
<> 144:ef7eb2e8f9f7 386
<> 144:ef7eb2e8f9f7 387 // Wait until STOP flag is set
<> 144:ef7eb2e8f9f7 388 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 389 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
<> 144:ef7eb2e8f9f7 390 Timeout--;
<> 144:ef7eb2e8f9f7 391 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 392 return -1;
<> 144:ef7eb2e8f9f7 393 }
<> 144:ef7eb2e8f9f7 394 }
<> 144:ef7eb2e8f9f7 395
<> 144:ef7eb2e8f9f7 396 // Clear STOP flag
<> 144:ef7eb2e8f9f7 397 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
<> 144:ef7eb2e8f9f7 398
<> 144:ef7eb2e8f9f7 399 // Wait until BUSY flag is reset
<> 144:ef7eb2e8f9f7 400 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 401 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
<> 144:ef7eb2e8f9f7 402 Timeout--;
<> 144:ef7eb2e8f9f7 403 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 404 return -1;
<> 144:ef7eb2e8f9f7 405 }
<> 144:ef7eb2e8f9f7 406 }
<> 144:ef7eb2e8f9f7 407
<> 144:ef7eb2e8f9f7 408 return size;
<> 144:ef7eb2e8f9f7 409 }
<> 144:ef7eb2e8f9f7 410
<> 144:ef7eb2e8f9f7 411 int i2c_slave_write(i2c_t *obj, const char *data, int length)
<> 144:ef7eb2e8f9f7 412 {
<> 144:ef7eb2e8f9f7 413 uint32_t Timeout;
<> 144:ef7eb2e8f9f7 414 int size = 0;
<> 144:ef7eb2e8f9f7 415
<> 144:ef7eb2e8f9f7 416 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 417
<> 144:ef7eb2e8f9f7 418 while (length > 0) {
<> 144:ef7eb2e8f9f7 419 // Wait until TXE flag is set
<> 144:ef7eb2e8f9f7 420 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 421 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
<> 144:ef7eb2e8f9f7 422 Timeout--;
<> 144:ef7eb2e8f9f7 423 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 424 return -1;
<> 144:ef7eb2e8f9f7 425 }
<> 144:ef7eb2e8f9f7 426 }
<> 144:ef7eb2e8f9f7 427
<> 144:ef7eb2e8f9f7 428 // Write data
<> 144:ef7eb2e8f9f7 429 I2cHandle.Instance->DR = (*data++);
<> 144:ef7eb2e8f9f7 430 length--;
<> 144:ef7eb2e8f9f7 431 size++;
<> 144:ef7eb2e8f9f7 432
<> 144:ef7eb2e8f9f7 433 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
<> 144:ef7eb2e8f9f7 434 // Write data to DR
<> 144:ef7eb2e8f9f7 435 I2cHandle.Instance->DR = (*data++);
<> 144:ef7eb2e8f9f7 436 length--;
<> 144:ef7eb2e8f9f7 437 size++;
<> 144:ef7eb2e8f9f7 438 }
<> 144:ef7eb2e8f9f7 439 }
<> 144:ef7eb2e8f9f7 440
<> 144:ef7eb2e8f9f7 441 // Wait until AF flag is set
<> 144:ef7eb2e8f9f7 442 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 443 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
<> 144:ef7eb2e8f9f7 444 Timeout--;
<> 144:ef7eb2e8f9f7 445 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 446 return -1;
<> 144:ef7eb2e8f9f7 447 }
<> 144:ef7eb2e8f9f7 448 }
<> 144:ef7eb2e8f9f7 449
<> 144:ef7eb2e8f9f7 450 // Clear AF flag
<> 144:ef7eb2e8f9f7 451 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
<> 144:ef7eb2e8f9f7 452
<> 144:ef7eb2e8f9f7 453 // Wait until BUSY flag is reset
<> 144:ef7eb2e8f9f7 454 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 455 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
<> 144:ef7eb2e8f9f7 456 Timeout--;
<> 144:ef7eb2e8f9f7 457 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 458 return -1;
<> 144:ef7eb2e8f9f7 459 }
<> 144:ef7eb2e8f9f7 460 }
<> 144:ef7eb2e8f9f7 461
<> 144:ef7eb2e8f9f7 462 return size;
<> 144:ef7eb2e8f9f7 463 }
<> 144:ef7eb2e8f9f7 464
<> 144:ef7eb2e8f9f7 465
<> 144:ef7eb2e8f9f7 466 #endif // DEVICE_I2CSLAVE
<> 144:ef7eb2e8f9f7 467
<> 144:ef7eb2e8f9f7 468 #endif // DEVICE_I2C