Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_STM/TARGET_STM32F7/i2c_api.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 *******************************************************************************
elessair 0:f269e3021894 3 * Copyright (c) 2015, STMicroelectronics
elessair 0:f269e3021894 4 * All rights reserved.
elessair 0:f269e3021894 5 *
elessair 0:f269e3021894 6 * Redistribution and use in source and binary forms, with or without
elessair 0:f269e3021894 7 * modification, are permitted provided that the following conditions are met:
elessair 0:f269e3021894 8 *
elessair 0:f269e3021894 9 * 1. Redistributions of source code must retain the above copyright notice,
elessair 0:f269e3021894 10 * this list of conditions and the following disclaimer.
elessair 0:f269e3021894 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
elessair 0:f269e3021894 12 * this list of conditions and the following disclaimer in the documentation
elessair 0:f269e3021894 13 * and/or other materials provided with the distribution.
elessair 0:f269e3021894 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
elessair 0:f269e3021894 15 * may be used to endorse or promote products derived from this software
elessair 0:f269e3021894 16 * without specific prior written permission.
elessair 0:f269e3021894 17 *
elessair 0:f269e3021894 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
elessair 0:f269e3021894 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
elessair 0:f269e3021894 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
elessair 0:f269e3021894 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
elessair 0:f269e3021894 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
elessair 0:f269e3021894 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
elessair 0:f269e3021894 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
elessair 0:f269e3021894 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
elessair 0:f269e3021894 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
elessair 0:f269e3021894 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
elessair 0:f269e3021894 28 *******************************************************************************
elessair 0:f269e3021894 29 */
elessair 0:f269e3021894 30 #include "mbed_assert.h"
elessair 0:f269e3021894 31 #include "i2c_api.h"
elessair 0:f269e3021894 32
elessair 0:f269e3021894 33 #if DEVICE_I2C
elessair 0:f269e3021894 34
elessair 0:f269e3021894 35 #include "cmsis.h"
elessair 0:f269e3021894 36 #include "pinmap.h"
elessair 0:f269e3021894 37 #include "PeripheralPins.h"
elessair 0:f269e3021894 38 #include "mbed_error.h"
elessair 0:f269e3021894 39
elessair 0:f269e3021894 40 /* Timeout values for flags and events waiting loops. These timeouts are
elessair 0:f269e3021894 41 not based on accurate values, they just guarantee that the application will
elessair 0:f269e3021894 42 not remain stuck if the I2C communication is corrupted. */
elessair 0:f269e3021894 43 #define FLAG_TIMEOUT ((int)0x4000)
elessair 0:f269e3021894 44 #define LONG_TIMEOUT ((int)0x8000)
elessair 0:f269e3021894 45
elessair 0:f269e3021894 46 I2C_HandleTypeDef I2cHandle;
elessair 0:f269e3021894 47
elessair 0:f269e3021894 48 int i2c1_inited = 0;
elessair 0:f269e3021894 49 int i2c2_inited = 0;
elessair 0:f269e3021894 50 int i2c3_inited = 0;
elessair 0:f269e3021894 51 int i2c4_inited = 0;
elessair 0:f269e3021894 52
elessair 0:f269e3021894 53
elessair 0:f269e3021894 54 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
elessair 0:f269e3021894 55 {
elessair 0:f269e3021894 56 // Determine the I2C to use
elessair 0:f269e3021894 57 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 58 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 59
elessair 0:f269e3021894 60 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
elessair 0:f269e3021894 61 MBED_ASSERT(obj->i2c != (I2CName)NC);
elessair 0:f269e3021894 62
elessair 0:f269e3021894 63 // Enable I2C clock and pinout if not done
elessair 0:f269e3021894 64 if ((obj->i2c == I2C_1) && !i2c1_inited) {
elessair 0:f269e3021894 65 i2c1_inited = 1;
elessair 0:f269e3021894 66 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_PCLK1);
elessair 0:f269e3021894 67 __HAL_RCC_I2C1_CLK_ENABLE();
elessair 0:f269e3021894 68 // Configure I2C1 pins
elessair 0:f269e3021894 69 pinmap_pinout(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 70 pinmap_pinout(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 71 pin_mode(sda, OpenDrain);
elessair 0:f269e3021894 72 pin_mode(scl, OpenDrain);
elessair 0:f269e3021894 73 }
elessair 0:f269e3021894 74
elessair 0:f269e3021894 75 #if defined(I2C2_BASE)
elessair 0:f269e3021894 76 if ((obj->i2c == I2C_2) && !i2c2_inited) {
elessair 0:f269e3021894 77 i2c2_inited = 1;
elessair 0:f269e3021894 78 __HAL_RCC_I2C2_CONFIG(RCC_I2C2CLKSOURCE_PCLK1);
elessair 0:f269e3021894 79 __HAL_RCC_I2C2_CLK_ENABLE();
elessair 0:f269e3021894 80 // Configure I2C2 pins
elessair 0:f269e3021894 81 pinmap_pinout(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 82 pinmap_pinout(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 83 pin_mode(sda, OpenDrain);
elessair 0:f269e3021894 84 pin_mode(scl, OpenDrain);
elessair 0:f269e3021894 85 }
elessair 0:f269e3021894 86 #endif
elessair 0:f269e3021894 87
elessair 0:f269e3021894 88 #if defined(I2C3_BASE)
elessair 0:f269e3021894 89 if ((obj->i2c == I2C_3) && !i2c3_inited) {
elessair 0:f269e3021894 90 i2c3_inited = 1;
elessair 0:f269e3021894 91 __HAL_RCC_I2C3_CONFIG(RCC_I2C3CLKSOURCE_PCLK1);
elessair 0:f269e3021894 92 __HAL_RCC_I2C3_CLK_ENABLE();
elessair 0:f269e3021894 93 // Configure I2C3 pins
elessair 0:f269e3021894 94 pinmap_pinout(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 95 pinmap_pinout(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 96 pin_mode(sda, OpenDrain);
elessair 0:f269e3021894 97 pin_mode(scl, OpenDrain);
elessair 0:f269e3021894 98 }
elessair 0:f269e3021894 99 #endif
elessair 0:f269e3021894 100
elessair 0:f269e3021894 101 #if defined(I2C4_BASE)
elessair 0:f269e3021894 102 if ((obj->i2c == I2C_4) && !i2c4_inited) {
elessair 0:f269e3021894 103 i2c4_inited = 1;
elessair 0:f269e3021894 104 __HAL_RCC_I2C4_CONFIG(RCC_I2C4CLKSOURCE_PCLK1);
elessair 0:f269e3021894 105 __HAL_RCC_I2C4_CLK_ENABLE();
elessair 0:f269e3021894 106 // Configure I2C4 pins
elessair 0:f269e3021894 107 pinmap_pinout(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 108 pinmap_pinout(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 109 pin_mode(sda, OpenDrain);
elessair 0:f269e3021894 110 pin_mode(scl, OpenDrain);
elessair 0:f269e3021894 111 }
elessair 0:f269e3021894 112 #endif
elessair 0:f269e3021894 113
elessair 0:f269e3021894 114 // Reset to clear pending flags if any
elessair 0:f269e3021894 115 i2c_reset(obj);
elessair 0:f269e3021894 116
elessair 0:f269e3021894 117 // I2C configuration
elessair 0:f269e3021894 118 i2c_frequency(obj, 100000); // 100 kHz per default
elessair 0:f269e3021894 119 }
elessair 0:f269e3021894 120
elessair 0:f269e3021894 121 void i2c_frequency(i2c_t *obj, int hz)
elessair 0:f269e3021894 122 {
elessair 0:f269e3021894 123 uint32_t tim = 0;
elessair 0:f269e3021894 124
elessair 0:f269e3021894 125 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
elessair 0:f269e3021894 126
elessair 0:f269e3021894 127 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 128 int timeout;
elessair 0:f269e3021894 129
elessair 0:f269e3021894 130 // wait before init
elessair 0:f269e3021894 131 timeout = LONG_TIMEOUT;
elessair 0:f269e3021894 132 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0)) {}
elessair 0:f269e3021894 133
elessair 0:f269e3021894 134 /*
elessair 0:f269e3021894 135 Values calculated with I2C_Timing_Configuration tool (excel file)
elessair 0:f269e3021894 136 * Standard mode (up to 100 kHz)
elessair 0:f269e3021894 137 * Fast Mode (up to 400 kHz)
elessair 0:f269e3021894 138 * Fast Mode Plus (up to 1 MHz)
elessair 0:f269e3021894 139 Below values obtained with:
elessair 0:f269e3021894 140 - I2Cx clock source = APB1CLK = 54 MHz
elessair 0:f269e3021894 141 - Analog filter delay = ON
elessair 0:f269e3021894 142 - Digital filter coefficient = 0
elessair 0:f269e3021894 143 */
elessair 0:f269e3021894 144 switch (hz) {
elessair 0:f269e3021894 145 case 100000:
elessair 0:f269e3021894 146 tim = 0x10916998; // Standard mode with Rise time = 120ns, Fall time = 120ns
elessair 0:f269e3021894 147 break;
elessair 0:f269e3021894 148 case 400000:
elessair 0:f269e3021894 149 tim = 0x00B11B54; // Fast Mode with Rise time = 120ns, Fall time = 120ns
elessair 0:f269e3021894 150 break;
elessair 0:f269e3021894 151 case 1000000:
elessair 0:f269e3021894 152 tim = 0x0090091B; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
elessair 0:f269e3021894 153 break;
elessair 0:f269e3021894 154 default:
elessair 0:f269e3021894 155 break;
elessair 0:f269e3021894 156 }
elessair 0:f269e3021894 157
elessair 0:f269e3021894 158 // I2C configuration
elessair 0:f269e3021894 159 I2cHandle.Init.Timing = tim;
elessair 0:f269e3021894 160 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
elessair 0:f269e3021894 161 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
elessair 0:f269e3021894 162 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
elessair 0:f269e3021894 163 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
elessair 0:f269e3021894 164 I2cHandle.Init.OwnAddress1 = 0;
elessair 0:f269e3021894 165 I2cHandle.Init.OwnAddress2 = 0;
elessair 0:f269e3021894 166 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
elessair 0:f269e3021894 167
elessair 0:f269e3021894 168 if (HAL_I2C_Init(&I2cHandle) != HAL_OK) {
elessair 0:f269e3021894 169 error("Cannot initialize I2C");
elessair 0:f269e3021894 170 }
elessair 0:f269e3021894 171 }
elessair 0:f269e3021894 172
elessair 0:f269e3021894 173 inline int i2c_start(i2c_t *obj)
elessair 0:f269e3021894 174 {
elessair 0:f269e3021894 175 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 176 int timeout;
elessair 0:f269e3021894 177
elessair 0:f269e3021894 178 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 179
elessair 0:f269e3021894 180 // Clear Acknowledge failure flag
elessair 0:f269e3021894 181 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
elessair 0:f269e3021894 182
elessair 0:f269e3021894 183 // Wait the STOP condition has been previously correctly sent
elessair 0:f269e3021894 184 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 185 while ((i2c->CR2 & I2C_CR2_STOP) == I2C_CR2_STOP){
elessair 0:f269e3021894 186 if ((timeout--) == 0) {
elessair 0:f269e3021894 187 return 1;
elessair 0:f269e3021894 188 }
elessair 0:f269e3021894 189 }
elessair 0:f269e3021894 190
elessair 0:f269e3021894 191 // Generate the START condition
elessair 0:f269e3021894 192 i2c->CR2 |= I2C_CR2_START;
elessair 0:f269e3021894 193
elessair 0:f269e3021894 194 // Wait the START condition has been correctly sent
elessair 0:f269e3021894 195 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 196 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
elessair 0:f269e3021894 197 if ((timeout--) == 0) {
elessair 0:f269e3021894 198 return 1;
elessair 0:f269e3021894 199 }
elessair 0:f269e3021894 200 }
elessair 0:f269e3021894 201
elessair 0:f269e3021894 202 return 0;
elessair 0:f269e3021894 203 }
elessair 0:f269e3021894 204
elessair 0:f269e3021894 205 inline int i2c_stop(i2c_t *obj)
elessair 0:f269e3021894 206 {
elessair 0:f269e3021894 207 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 208
elessair 0:f269e3021894 209 // Generate the STOP condition
elessair 0:f269e3021894 210 i2c->CR2 |= I2C_CR2_STOP;
elessair 0:f269e3021894 211
elessair 0:f269e3021894 212 return 0;
elessair 0:f269e3021894 213 }
elessair 0:f269e3021894 214
elessair 0:f269e3021894 215 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
elessair 0:f269e3021894 216 {
elessair 0:f269e3021894 217 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 218 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 219 int timeout;
elessair 0:f269e3021894 220 int count;
elessair 0:f269e3021894 221 int value;
elessair 0:f269e3021894 222
elessair 0:f269e3021894 223 /* update CR2 register */
elessair 0:f269e3021894 224 i2c->CR2 = (i2c->CR2 & (uint32_t)~((uint32_t)(I2C_CR2_SADD | I2C_CR2_NBYTES | I2C_CR2_RELOAD | I2C_CR2_AUTOEND | I2C_CR2_RD_WRN | I2C_CR2_START | I2C_CR2_STOP)))
elessair 0:f269e3021894 225 | (uint32_t)(((uint32_t)address & I2C_CR2_SADD) | (((uint32_t)length << 16) & I2C_CR2_NBYTES) | (uint32_t)I2C_SOFTEND_MODE | (uint32_t)I2C_GENERATE_START_READ);
elessair 0:f269e3021894 226
elessair 0:f269e3021894 227 // Read all bytes
elessair 0:f269e3021894 228 for (count = 0; count < length; count++) {
elessair 0:f269e3021894 229 value = i2c_byte_read(obj, 0);
elessair 0:f269e3021894 230 data[count] = (char)value;
elessair 0:f269e3021894 231 }
elessair 0:f269e3021894 232
elessair 0:f269e3021894 233 // Wait transfer complete
elessair 0:f269e3021894 234 timeout = LONG_TIMEOUT;
elessair 0:f269e3021894 235 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
elessair 0:f269e3021894 236 timeout--;
elessair 0:f269e3021894 237 if (timeout == 0) {
elessair 0:f269e3021894 238 return -1;
elessair 0:f269e3021894 239 }
elessair 0:f269e3021894 240 }
elessair 0:f269e3021894 241
elessair 0:f269e3021894 242 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
elessair 0:f269e3021894 243
elessair 0:f269e3021894 244 // If not repeated start, send stop.
elessair 0:f269e3021894 245 if (stop) {
elessair 0:f269e3021894 246 i2c_stop(obj);
elessair 0:f269e3021894 247 /* Wait until STOPF flag is set */
elessair 0:f269e3021894 248 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 249 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
elessair 0:f269e3021894 250 timeout--;
elessair 0:f269e3021894 251 if (timeout == 0) {
elessair 0:f269e3021894 252 return -1;
elessair 0:f269e3021894 253 }
elessair 0:f269e3021894 254 }
elessair 0:f269e3021894 255 /* Clear STOP Flag */
elessair 0:f269e3021894 256 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
elessair 0:f269e3021894 257 }
elessair 0:f269e3021894 258
elessair 0:f269e3021894 259 return length;
elessair 0:f269e3021894 260 }
elessair 0:f269e3021894 261
elessair 0:f269e3021894 262 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
elessair 0:f269e3021894 263 {
elessair 0:f269e3021894 264 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 265 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 266 int timeout;
elessair 0:f269e3021894 267 int count;
elessair 0:f269e3021894 268
elessair 0:f269e3021894 269 /* update CR2 register */
elessair 0:f269e3021894 270 i2c->CR2 = (i2c->CR2 & (uint32_t)~((uint32_t)(I2C_CR2_SADD | I2C_CR2_NBYTES | I2C_CR2_RELOAD | I2C_CR2_AUTOEND | I2C_CR2_RD_WRN | I2C_CR2_START | I2C_CR2_STOP)))
elessair 0:f269e3021894 271 | (uint32_t)(((uint32_t)address & I2C_CR2_SADD) | (((uint32_t)length << 16) & I2C_CR2_NBYTES) | (uint32_t)I2C_SOFTEND_MODE | (uint32_t)I2C_GENERATE_START_WRITE);
elessair 0:f269e3021894 272
elessair 0:f269e3021894 273 for (count = 0; count < length; count++) {
elessair 0:f269e3021894 274 i2c_byte_write(obj, data[count]);
elessair 0:f269e3021894 275 }
elessair 0:f269e3021894 276
elessair 0:f269e3021894 277 // Wait transfer complete
elessair 0:f269e3021894 278 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 279 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
elessair 0:f269e3021894 280 timeout--;
elessair 0:f269e3021894 281 if (timeout == 0) {
elessair 0:f269e3021894 282 return -1;
elessair 0:f269e3021894 283 }
elessair 0:f269e3021894 284 }
elessair 0:f269e3021894 285
elessair 0:f269e3021894 286 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
elessair 0:f269e3021894 287
elessair 0:f269e3021894 288 // If not repeated start, send stop.
elessair 0:f269e3021894 289 if (stop) {
elessair 0:f269e3021894 290 i2c_stop(obj);
elessair 0:f269e3021894 291 /* Wait until STOPF flag is set */
elessair 0:f269e3021894 292 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 293 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
elessair 0:f269e3021894 294 timeout--;
elessair 0:f269e3021894 295 if (timeout == 0) {
elessair 0:f269e3021894 296 return -1;
elessair 0:f269e3021894 297 }
elessair 0:f269e3021894 298 }
elessair 0:f269e3021894 299 /* Clear STOP Flag */
elessair 0:f269e3021894 300 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
elessair 0:f269e3021894 301 }
elessair 0:f269e3021894 302
elessair 0:f269e3021894 303 return count;
elessair 0:f269e3021894 304 }
elessair 0:f269e3021894 305
elessair 0:f269e3021894 306 int i2c_byte_read(i2c_t *obj, int last)
elessair 0:f269e3021894 307 {
elessair 0:f269e3021894 308 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 309 int timeout;
elessair 0:f269e3021894 310
elessair 0:f269e3021894 311 // Wait until the byte is received
elessair 0:f269e3021894 312 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 313 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
elessair 0:f269e3021894 314 if ((timeout--) == 0) {
elessair 0:f269e3021894 315 return -1;
elessair 0:f269e3021894 316 }
elessair 0:f269e3021894 317 }
elessair 0:f269e3021894 318
elessair 0:f269e3021894 319 return (int)i2c->RXDR;
elessair 0:f269e3021894 320 }
elessair 0:f269e3021894 321
elessair 0:f269e3021894 322 int i2c_byte_write(i2c_t *obj, int data)
elessair 0:f269e3021894 323 {
elessair 0:f269e3021894 324 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 325 int timeout;
elessair 0:f269e3021894 326
elessair 0:f269e3021894 327 // Wait until the previous byte is transmitted
elessair 0:f269e3021894 328 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 329 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
elessair 0:f269e3021894 330 if ((timeout--) == 0) {
elessair 0:f269e3021894 331 return 0;
elessair 0:f269e3021894 332 }
elessair 0:f269e3021894 333 }
elessair 0:f269e3021894 334
elessair 0:f269e3021894 335 i2c->TXDR = (uint8_t)data;
elessair 0:f269e3021894 336
elessair 0:f269e3021894 337 return 1;
elessair 0:f269e3021894 338 }
elessair 0:f269e3021894 339
elessair 0:f269e3021894 340 void i2c_reset(i2c_t *obj)
elessair 0:f269e3021894 341 {
elessair 0:f269e3021894 342 int timeout;
elessair 0:f269e3021894 343
elessair 0:f269e3021894 344 // wait before reset
elessair 0:f269e3021894 345 timeout = LONG_TIMEOUT;
elessair 0:f269e3021894 346 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
elessair 0:f269e3021894 347
elessair 0:f269e3021894 348 __I2C1_FORCE_RESET();
elessair 0:f269e3021894 349 __I2C1_RELEASE_RESET();
elessair 0:f269e3021894 350 }
elessair 0:f269e3021894 351
elessair 0:f269e3021894 352 #if DEVICE_I2CSLAVE
elessair 0:f269e3021894 353
elessair 0:f269e3021894 354 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
elessair 0:f269e3021894 355 {
elessair 0:f269e3021894 356 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 357 uint16_t tmpreg;
elessair 0:f269e3021894 358
elessair 0:f269e3021894 359 // disable
elessair 0:f269e3021894 360 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
elessair 0:f269e3021894 361 // Get the old register value
elessair 0:f269e3021894 362 tmpreg = i2c->OAR1;
elessair 0:f269e3021894 363 // Reset address bits
elessair 0:f269e3021894 364 tmpreg &= 0xFC00;
elessair 0:f269e3021894 365 // Set new address
elessair 0:f269e3021894 366 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
elessair 0:f269e3021894 367 // Store the new register value
elessair 0:f269e3021894 368 i2c->OAR1 = tmpreg;
elessair 0:f269e3021894 369 // enable
elessair 0:f269e3021894 370 i2c->OAR1 |= I2C_OAR1_OA1EN;
elessair 0:f269e3021894 371 }
elessair 0:f269e3021894 372
elessair 0:f269e3021894 373 void i2c_slave_mode(i2c_t *obj, int enable_slave)
elessair 0:f269e3021894 374 {
elessair 0:f269e3021894 375
elessair 0:f269e3021894 376 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 377 uint16_t tmpreg;
elessair 0:f269e3021894 378
elessair 0:f269e3021894 379 // Get the old register value
elessair 0:f269e3021894 380 tmpreg = i2c->OAR1;
elessair 0:f269e3021894 381
elessair 0:f269e3021894 382 // Enable / disable slave
elessair 0:f269e3021894 383 if (enable_slave == 1) {
elessair 0:f269e3021894 384 tmpreg |= I2C_OAR1_OA1EN;
elessair 0:f269e3021894 385 } else {
elessair 0:f269e3021894 386 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
elessair 0:f269e3021894 387 }
elessair 0:f269e3021894 388
elessair 0:f269e3021894 389 // Set new mode
elessair 0:f269e3021894 390 i2c->OAR1 = tmpreg;
elessair 0:f269e3021894 391
elessair 0:f269e3021894 392 }
elessair 0:f269e3021894 393
elessair 0:f269e3021894 394 // See I2CSlave.h
elessair 0:f269e3021894 395 #define NoData 0 // the slave has not been addressed
elessair 0:f269e3021894 396 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
elessair 0:f269e3021894 397 #define WriteGeneral 2 // the master is writing to all slave
elessair 0:f269e3021894 398 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
elessair 0:f269e3021894 399
elessair 0:f269e3021894 400 int i2c_slave_receive(i2c_t *obj)
elessair 0:f269e3021894 401 {
elessair 0:f269e3021894 402 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 403 int retValue = NoData;
elessair 0:f269e3021894 404
elessair 0:f269e3021894 405 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
elessair 0:f269e3021894 406 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
elessair 0:f269e3021894 407 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
elessair 0:f269e3021894 408 retValue = ReadAddressed;
elessair 0:f269e3021894 409 else
elessair 0:f269e3021894 410 retValue = WriteAddressed;
elessair 0:f269e3021894 411 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
elessair 0:f269e3021894 412 }
elessair 0:f269e3021894 413 }
elessair 0:f269e3021894 414
elessair 0:f269e3021894 415 return (retValue);
elessair 0:f269e3021894 416 }
elessair 0:f269e3021894 417
elessair 0:f269e3021894 418 int i2c_slave_read(i2c_t *obj, char *data, int length)
elessair 0:f269e3021894 419 {
elessair 0:f269e3021894 420 char size = 0;
elessair 0:f269e3021894 421
elessair 0:f269e3021894 422 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
elessair 0:f269e3021894 423
elessair 0:f269e3021894 424 return size;
elessair 0:f269e3021894 425 }
elessair 0:f269e3021894 426
elessair 0:f269e3021894 427 int i2c_slave_write(i2c_t *obj, const char *data, int length)
elessair 0:f269e3021894 428 {
elessair 0:f269e3021894 429 char size = 0;
elessair 0:f269e3021894 430 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 431
elessair 0:f269e3021894 432 do {
elessair 0:f269e3021894 433 i2c_byte_write(obj, data[size]);
elessair 0:f269e3021894 434 size++;
elessair 0:f269e3021894 435 } while (size < length);
elessair 0:f269e3021894 436
elessair 0:f269e3021894 437 return size;
elessair 0:f269e3021894 438 }
elessair 0:f269e3021894 439
elessair 0:f269e3021894 440
elessair 0:f269e3021894 441 #endif // DEVICE_I2CSLAVE
elessair 0:f269e3021894 442
elessair 0:f269e3021894 443 #endif // DEVICE_I2C