Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_STM/TARGET_STM32L4/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 "mbed_error.h"
elessair 0:f269e3021894 38 #include "PeripheralPins.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)0x1000)
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 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
elessair 0:f269e3021894 49 {
elessair 0:f269e3021894 50 static int i2c1_inited = 0;
elessair 0:f269e3021894 51 #if defined(I2C2_BASE)
elessair 0:f269e3021894 52 static int i2c2_inited = 0;
elessair 0:f269e3021894 53 #endif
elessair 0:f269e3021894 54 #if defined(I2C3_BASE)
elessair 0:f269e3021894 55 static int i2c3_inited = 0;
elessair 0:f269e3021894 56 #endif
elessair 0:f269e3021894 57
elessair 0:f269e3021894 58 // Determine the I2C to use
elessair 0:f269e3021894 59 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 60 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 61
elessair 0:f269e3021894 62 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
elessair 0:f269e3021894 63 MBED_ASSERT(obj->i2c != (I2CName)NC);
elessair 0:f269e3021894 64
elessair 0:f269e3021894 65 // Enable I2C1 clock and pinout if not done
elessair 0:f269e3021894 66 if ((obj->i2c == I2C_1) && !i2c1_inited) {
elessair 0:f269e3021894 67 i2c1_inited = 1;
elessair 0:f269e3021894 68 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
elessair 0:f269e3021894 69 __HAL_RCC_I2C1_CLK_ENABLE();
elessair 0:f269e3021894 70 // Configure I2C pins
elessair 0:f269e3021894 71 pinmap_pinout(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 72 pinmap_pinout(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 73 pin_mode(sda, OpenDrain);
elessair 0:f269e3021894 74 pin_mode(scl, OpenDrain);
elessair 0:f269e3021894 75 }
elessair 0:f269e3021894 76
elessair 0:f269e3021894 77 #if defined(I2C2_BASE)
elessair 0:f269e3021894 78 // Enable I2C2 clock and pinout if not done
elessair 0:f269e3021894 79 if ((obj->i2c == I2C_2) && !i2c2_inited) {
elessair 0:f269e3021894 80 i2c2_inited = 1;
elessair 0:f269e3021894 81 __HAL_RCC_I2C2_CLK_ENABLE();
elessair 0:f269e3021894 82 // Configure I2C pins
elessair 0:f269e3021894 83 pinmap_pinout(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 84 pinmap_pinout(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 85 pin_mode(sda, OpenDrain);
elessair 0:f269e3021894 86 pin_mode(scl, OpenDrain);
elessair 0:f269e3021894 87 }
elessair 0:f269e3021894 88 #endif
elessair 0:f269e3021894 89
elessair 0:f269e3021894 90 #if defined(I2C3_BASE)
elessair 0:f269e3021894 91 // Enable I2C3 clock and pinout if not done
elessair 0:f269e3021894 92 if ((obj->i2c == I2C_3) && !i2c3_inited) {
elessair 0:f269e3021894 93 i2c3_inited = 1;
elessair 0:f269e3021894 94 __HAL_RCC_I2C3_CLK_ENABLE();
elessair 0:f269e3021894 95 // Configure I2C pins
elessair 0:f269e3021894 96 pinmap_pinout(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 97 pinmap_pinout(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 98 pin_mode(sda, OpenDrain);
elessair 0:f269e3021894 99 pin_mode(scl, OpenDrain);
elessair 0:f269e3021894 100 }
elessair 0:f269e3021894 101 #endif
elessair 0:f269e3021894 102
elessair 0:f269e3021894 103 // Reset to clear pending flags if any
elessair 0:f269e3021894 104 i2c_reset(obj);
elessair 0:f269e3021894 105
elessair 0:f269e3021894 106 // I2C configuration
elessair 0:f269e3021894 107 i2c_frequency(obj, 100000); // 100 kHz per default
elessair 0:f269e3021894 108 }
elessair 0:f269e3021894 109
elessair 0:f269e3021894 110 void i2c_frequency(i2c_t *obj, int hz)
elessair 0:f269e3021894 111 {
elessair 0:f269e3021894 112 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
elessair 0:f269e3021894 113 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 114 int timeout;
elessair 0:f269e3021894 115
elessair 0:f269e3021894 116 // wait before init
elessair 0:f269e3021894 117 timeout = LONG_TIMEOUT;
elessair 0:f269e3021894 118 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
elessair 0:f269e3021894 119
elessair 0:f269e3021894 120 // Update the SystemCoreClock variable.
elessair 0:f269e3021894 121 SystemCoreClockUpdate();
elessair 0:f269e3021894 122
elessair 0:f269e3021894 123 if (SystemCoreClock == 80000000) {
elessair 0:f269e3021894 124 // Common settings: I2C clock = 80 MHz, Analog filter = ON, Digital filter coefficient = 0
elessair 0:f269e3021894 125 switch (hz) {
elessair 0:f269e3021894 126 case 100000:
elessair 0:f269e3021894 127 I2cHandle.Init.Timing = 0x30C14E6B; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
elessair 0:f269e3021894 128 break;
elessair 0:f269e3021894 129 case 400000:
elessair 0:f269e3021894 130 I2cHandle.Init.Timing = 0x10D1143A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
elessair 0:f269e3021894 131 break;
elessair 0:f269e3021894 132 case 1000000:
elessair 0:f269e3021894 133 I2cHandle.Init.Timing = 0x00810E27; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
elessair 0:f269e3021894 134 break;
elessair 0:f269e3021894 135 default:
elessair 0:f269e3021894 136 break;
elessair 0:f269e3021894 137 }
elessair 0:f269e3021894 138 } else if (SystemCoreClock == 48000000) {
elessair 0:f269e3021894 139 // Common settings: I2C clock = 48 MHz, Analog filter = ON, Digital filter coefficient = 0
elessair 0:f269e3021894 140 switch (hz) {
elessair 0:f269e3021894 141 case 100000:
elessair 0:f269e3021894 142 I2cHandle.Init.Timing = 0x20A03E55; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
elessair 0:f269e3021894 143 break;
elessair 0:f269e3021894 144 case 400000:
elessair 0:f269e3021894 145 I2cHandle.Init.Timing = 0x10800C21; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
elessair 0:f269e3021894 146 break;
elessair 0:f269e3021894 147 case 1000000:
elessair 0:f269e3021894 148 I2cHandle.Init.Timing = 0x00500816; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
elessair 0:f269e3021894 149 break;
elessair 0:f269e3021894 150 default:
elessair 0:f269e3021894 151 break;
elessair 0:f269e3021894 152 }
elessair 0:f269e3021894 153 }
elessair 0:f269e3021894 154
elessair 0:f269e3021894 155 // Enable the Fast Mode Plus capability
elessair 0:f269e3021894 156 if (hz == 1000000) {
elessair 0:f269e3021894 157 if (obj->i2c == I2C_1) {
elessair 0:f269e3021894 158 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C1);
elessair 0:f269e3021894 159 }
elessair 0:f269e3021894 160 #if defined(I2C2_BASE)
elessair 0:f269e3021894 161 if (obj->i2c == I2C_2) {
elessair 0:f269e3021894 162 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C2);
elessair 0:f269e3021894 163 }
elessair 0:f269e3021894 164 #endif
elessair 0:f269e3021894 165 #if defined(I2C3_BASE)
elessair 0:f269e3021894 166 if (obj->i2c == I2C_3) {
elessair 0:f269e3021894 167 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C3);
elessair 0:f269e3021894 168 }
elessair 0:f269e3021894 169 #endif
elessair 0:f269e3021894 170 }
elessair 0:f269e3021894 171
elessair 0:f269e3021894 172
elessair 0:f269e3021894 173 // I2C configuration
elessair 0:f269e3021894 174 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
elessair 0:f269e3021894 175 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
elessair 0:f269e3021894 176 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
elessair 0:f269e3021894 177 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
elessair 0:f269e3021894 178 I2cHandle.Init.OwnAddress1 = 0;
elessair 0:f269e3021894 179 I2cHandle.Init.OwnAddress2 = 0;
elessair 0:f269e3021894 180 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
elessair 0:f269e3021894 181
elessair 0:f269e3021894 182 if (HAL_I2C_Init(&I2cHandle) != HAL_OK) {
elessair 0:f269e3021894 183 error("Cannot initialize I2C\n");
elessair 0:f269e3021894 184 }
elessair 0:f269e3021894 185 }
elessair 0:f269e3021894 186
elessair 0:f269e3021894 187 inline int i2c_start(i2c_t *obj)
elessair 0:f269e3021894 188 {
elessair 0:f269e3021894 189 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 190 int timeout;
elessair 0:f269e3021894 191
elessair 0:f269e3021894 192 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 193
elessair 0:f269e3021894 194 // Clear Acknowledge failure flag
elessair 0:f269e3021894 195 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
elessair 0:f269e3021894 196
elessair 0:f269e3021894 197 // Wait the STOP condition has been previously correctly sent
elessair 0:f269e3021894 198 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 199 while ((i2c->CR2 & I2C_CR2_STOP) == I2C_CR2_STOP){
elessair 0:f269e3021894 200 if ((timeout--) == 0) {
elessair 0:f269e3021894 201 return 1;
elessair 0:f269e3021894 202 }
elessair 0:f269e3021894 203 }
elessair 0:f269e3021894 204
elessair 0:f269e3021894 205 // Generate the START condition
elessair 0:f269e3021894 206 i2c->CR2 |= I2C_CR2_START;
elessair 0:f269e3021894 207
elessair 0:f269e3021894 208 // Wait the START condition has been correctly sent
elessair 0:f269e3021894 209 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 210 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
elessair 0:f269e3021894 211 if ((timeout--) == 0) {
elessair 0:f269e3021894 212 return 1;
elessair 0:f269e3021894 213 }
elessair 0:f269e3021894 214 }
elessair 0:f269e3021894 215
elessair 0:f269e3021894 216 return 0;
elessair 0:f269e3021894 217 }
elessair 0:f269e3021894 218
elessair 0:f269e3021894 219 inline int i2c_stop(i2c_t *obj)
elessair 0:f269e3021894 220 {
elessair 0:f269e3021894 221 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 222
elessair 0:f269e3021894 223 // Generate the STOP condition
elessair 0:f269e3021894 224 i2c->CR2 |= I2C_CR2_STOP;
elessair 0:f269e3021894 225
elessair 0:f269e3021894 226 return 0;
elessair 0:f269e3021894 227 }
elessair 0:f269e3021894 228
elessair 0:f269e3021894 229 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
elessair 0:f269e3021894 230 {
elessair 0:f269e3021894 231 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 232 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 233 int timeout;
elessair 0:f269e3021894 234 int count;
elessair 0:f269e3021894 235 int value;
elessair 0:f269e3021894 236
elessair 0:f269e3021894 237 /* update CR2 register */
elessair 0:f269e3021894 238 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 239 | (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 240
elessair 0:f269e3021894 241 // Read all bytes
elessair 0:f269e3021894 242 for (count = 0; count < length; count++) {
elessair 0:f269e3021894 243 value = i2c_byte_read(obj, 0);
elessair 0:f269e3021894 244 data[count] = (char)value;
elessair 0:f269e3021894 245 }
elessair 0:f269e3021894 246
elessair 0:f269e3021894 247 // Wait transfer complete
elessair 0:f269e3021894 248 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 249 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == 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
elessair 0:f269e3021894 256 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
elessair 0:f269e3021894 257
elessair 0:f269e3021894 258 // If not repeated start, send stop.
elessair 0:f269e3021894 259 if (stop) {
elessair 0:f269e3021894 260 i2c_stop(obj);
elessair 0:f269e3021894 261 /* Wait until STOPF flag is set */
elessair 0:f269e3021894 262 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 263 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
elessair 0:f269e3021894 264 timeout--;
elessair 0:f269e3021894 265 if (timeout == 0) {
elessair 0:f269e3021894 266 return -1;
elessair 0:f269e3021894 267 }
elessair 0:f269e3021894 268 }
elessair 0:f269e3021894 269 /* Clear STOP Flag */
elessair 0:f269e3021894 270 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
elessair 0:f269e3021894 271 }
elessair 0:f269e3021894 272
elessair 0:f269e3021894 273 return length;
elessair 0:f269e3021894 274 }
elessair 0:f269e3021894 275
elessair 0:f269e3021894 276 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
elessair 0:f269e3021894 277 {
elessair 0:f269e3021894 278 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 279 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 280 int timeout;
elessair 0:f269e3021894 281 int count;
elessair 0:f269e3021894 282
elessair 0:f269e3021894 283 /* update CR2 register */
elessair 0:f269e3021894 284 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 285 | (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 286
elessair 0:f269e3021894 287 for (count = 0; count < length; count++) {
elessair 0:f269e3021894 288 i2c_byte_write(obj, data[count]);
elessair 0:f269e3021894 289 }
elessair 0:f269e3021894 290
elessair 0:f269e3021894 291 // Wait transfer complete
elessair 0:f269e3021894 292 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 293 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == 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
elessair 0:f269e3021894 300 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
elessair 0:f269e3021894 301
elessair 0:f269e3021894 302 // If not repeated start, send stop.
elessair 0:f269e3021894 303 if (stop) {
elessair 0:f269e3021894 304 i2c_stop(obj);
elessair 0:f269e3021894 305 /* Wait until STOPF flag is set */
elessair 0:f269e3021894 306 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 307 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
elessair 0:f269e3021894 308 timeout--;
elessair 0:f269e3021894 309 if (timeout == 0) {
elessair 0:f269e3021894 310 return -1;
elessair 0:f269e3021894 311 }
elessair 0:f269e3021894 312 }
elessair 0:f269e3021894 313 /* Clear STOP Flag */
elessair 0:f269e3021894 314 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
elessair 0:f269e3021894 315 }
elessair 0:f269e3021894 316
elessair 0:f269e3021894 317 return count;
elessair 0:f269e3021894 318 }
elessair 0:f269e3021894 319
elessair 0:f269e3021894 320 int i2c_byte_read(i2c_t *obj, int last)
elessair 0:f269e3021894 321 {
elessair 0:f269e3021894 322 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 323 int timeout;
elessair 0:f269e3021894 324
elessair 0:f269e3021894 325 // Wait until the byte is received
elessair 0:f269e3021894 326 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 327 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
elessair 0:f269e3021894 328 if ((timeout--) == 0) {
elessair 0:f269e3021894 329 return -1;
elessair 0:f269e3021894 330 }
elessair 0:f269e3021894 331 }
elessair 0:f269e3021894 332
elessair 0:f269e3021894 333 return (int)i2c->RXDR;
elessair 0:f269e3021894 334 }
elessair 0:f269e3021894 335
elessair 0:f269e3021894 336 int i2c_byte_write(i2c_t *obj, int data)
elessair 0:f269e3021894 337 {
elessair 0:f269e3021894 338 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 339 int timeout;
elessair 0:f269e3021894 340
elessair 0:f269e3021894 341 // Wait until the previous byte is transmitted
elessair 0:f269e3021894 342 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 343 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
elessair 0:f269e3021894 344 if ((timeout--) == 0) {
elessair 0:f269e3021894 345 return 0;
elessair 0:f269e3021894 346 }
elessair 0:f269e3021894 347 }
elessair 0:f269e3021894 348
elessair 0:f269e3021894 349 i2c->TXDR = (uint8_t)data;
elessair 0:f269e3021894 350
elessair 0:f269e3021894 351 return 1;
elessair 0:f269e3021894 352 }
elessair 0:f269e3021894 353
elessair 0:f269e3021894 354 void i2c_reset(i2c_t *obj)
elessair 0:f269e3021894 355 {
elessair 0:f269e3021894 356 int timeout;
elessair 0:f269e3021894 357
elessair 0:f269e3021894 358 // wait before reset
elessair 0:f269e3021894 359 timeout = LONG_TIMEOUT;
elessair 0:f269e3021894 360 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
elessair 0:f269e3021894 361
elessair 0:f269e3021894 362 if (obj->i2c == I2C_1) {
elessair 0:f269e3021894 363 __HAL_RCC_I2C1_FORCE_RESET();
elessair 0:f269e3021894 364 __HAL_RCC_I2C1_RELEASE_RESET();
elessair 0:f269e3021894 365 }
elessair 0:f269e3021894 366 #if defined(I2C2_BASE)
elessair 0:f269e3021894 367 if (obj->i2c == I2C_2) {
elessair 0:f269e3021894 368 __HAL_RCC_I2C2_FORCE_RESET();
elessair 0:f269e3021894 369 __HAL_RCC_I2C2_RELEASE_RESET();
elessair 0:f269e3021894 370 }
elessair 0:f269e3021894 371 #endif
elessair 0:f269e3021894 372 }
elessair 0:f269e3021894 373
elessair 0:f269e3021894 374 #if DEVICE_I2CSLAVE
elessair 0:f269e3021894 375
elessair 0:f269e3021894 376 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
elessair 0:f269e3021894 377 {
elessair 0:f269e3021894 378 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 379 uint16_t tmpreg;
elessair 0:f269e3021894 380
elessair 0:f269e3021894 381 // disable
elessair 0:f269e3021894 382 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
elessair 0:f269e3021894 383 // Get the old register value
elessair 0:f269e3021894 384 tmpreg = i2c->OAR1;
elessair 0:f269e3021894 385 // Reset address bits
elessair 0:f269e3021894 386 tmpreg &= 0xFC00;
elessair 0:f269e3021894 387 // Set new address
elessair 0:f269e3021894 388 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
elessair 0:f269e3021894 389 // Store the new register value
elessair 0:f269e3021894 390 i2c->OAR1 = tmpreg;
elessair 0:f269e3021894 391 // enable
elessair 0:f269e3021894 392 i2c->OAR1 |= I2C_OAR1_OA1EN;
elessair 0:f269e3021894 393 }
elessair 0:f269e3021894 394
elessair 0:f269e3021894 395 void i2c_slave_mode(i2c_t *obj, int enable_slave)
elessair 0:f269e3021894 396 {
elessair 0:f269e3021894 397
elessair 0:f269e3021894 398 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 399 uint16_t tmpreg;
elessair 0:f269e3021894 400
elessair 0:f269e3021894 401 // Get the old register value
elessair 0:f269e3021894 402 tmpreg = i2c->OAR1;
elessair 0:f269e3021894 403
elessair 0:f269e3021894 404 // Enable / disable slave
elessair 0:f269e3021894 405 if (enable_slave == 1) {
elessair 0:f269e3021894 406 tmpreg |= I2C_OAR1_OA1EN;
elessair 0:f269e3021894 407 } else {
elessair 0:f269e3021894 408 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
elessair 0:f269e3021894 409 }
elessair 0:f269e3021894 410
elessair 0:f269e3021894 411 // Set new mode
elessair 0:f269e3021894 412 i2c->OAR1 = tmpreg;
elessair 0:f269e3021894 413
elessair 0:f269e3021894 414 }
elessair 0:f269e3021894 415
elessair 0:f269e3021894 416 // See I2CSlave.h
elessair 0:f269e3021894 417 #define NoData 0 // the slave has not been addressed
elessair 0:f269e3021894 418 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
elessair 0:f269e3021894 419 #define WriteGeneral 2 // the master is writing to all slave
elessair 0:f269e3021894 420 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
elessair 0:f269e3021894 421
elessair 0:f269e3021894 422 int i2c_slave_receive(i2c_t *obj)
elessair 0:f269e3021894 423 {
elessair 0:f269e3021894 424 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 425 int retValue = NoData;
elessair 0:f269e3021894 426
elessair 0:f269e3021894 427 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
elessair 0:f269e3021894 428 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
elessair 0:f269e3021894 429 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
elessair 0:f269e3021894 430 retValue = ReadAddressed;
elessair 0:f269e3021894 431 else
elessair 0:f269e3021894 432 retValue = WriteAddressed;
elessair 0:f269e3021894 433 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
elessair 0:f269e3021894 434 }
elessair 0:f269e3021894 435 }
elessair 0:f269e3021894 436
elessair 0:f269e3021894 437 return (retValue);
elessair 0:f269e3021894 438 }
elessair 0:f269e3021894 439
elessair 0:f269e3021894 440 int i2c_slave_read(i2c_t *obj, char *data, int length)
elessair 0:f269e3021894 441 {
elessair 0:f269e3021894 442 char size = 0;
elessair 0:f269e3021894 443
elessair 0:f269e3021894 444 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
elessair 0:f269e3021894 445
elessair 0:f269e3021894 446 return size;
elessair 0:f269e3021894 447 }
elessair 0:f269e3021894 448
elessair 0:f269e3021894 449 int i2c_slave_write(i2c_t *obj, const char *data, int length)
elessair 0:f269e3021894 450 {
elessair 0:f269e3021894 451 char size = 0;
elessair 0:f269e3021894 452 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 453
elessair 0:f269e3021894 454 do {
elessair 0:f269e3021894 455 i2c_byte_write(obj, data[size]);
elessair 0:f269e3021894 456 size++;
elessair 0:f269e3021894 457 } while (size < length);
elessair 0:f269e3021894 458
elessair 0:f269e3021894 459 return size;
elessair 0:f269e3021894 460 }
elessair 0:f269e3021894 461
elessair 0:f269e3021894 462
elessair 0:f269e3021894 463 #endif // DEVICE_I2CSLAVE
elessair 0:f269e3021894 464
elessair 0:f269e3021894 465 #endif // DEVICE_I2C