Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_STM/TARGET_STM32F3/i2c_api.c@1:3deb71413561, 2017-07-20 (annotated)

Committer:
xuaner
Date:
Thu Jul 20 14:26:57 2017 +0000
Revision:
1:3deb71413561
Parent:
0:f269e3021894 
mbed_os

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) 2014, 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
elessair 0:f269e3021894 39 /* Timeout values for flags and events waiting loops. These timeouts are
elessair 0:f269e3021894 40 not based on accurate values, they just guarantee that the application will
elessair 0:f269e3021894 41 not remain stuck if the I2C communication is corrupted. */
elessair 0:f269e3021894 42 #define FLAG_TIMEOUT ((int)0x4000)
elessair 0:f269e3021894 43 #define LONG_TIMEOUT ((int)0x8000)
elessair 0:f269e3021894 44
elessair 0:f269e3021894 45 I2C_HandleTypeDef I2cHandle;
elessair 0:f269e3021894 46
elessair 0:f269e3021894 47 int i2c1_inited = 0;
elessair 0:f269e3021894 48 int i2c2_inited = 0;
elessair 0:f269e3021894 49 int i2c3_inited = 0;
elessair 0:f269e3021894 50
elessair 0:f269e3021894 51 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
elessair 0:f269e3021894 52 {
elessair 0:f269e3021894 53 // Determine the I2C to use
elessair 0:f269e3021894 54 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 55 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 56
elessair 0:f269e3021894 57 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
elessair 0:f269e3021894 58 MBED_ASSERT(obj->i2c != (I2CName)NC);
elessair 0:f269e3021894 59
elessair 0:f269e3021894 60 // Enable I2C clock and pinout if not done
elessair 0:f269e3021894 61 if ((obj->i2c == I2C_1) && !i2c1_inited) {
elessair 0:f269e3021894 62 i2c1_inited = 1;
elessair 0:f269e3021894 63 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
elessair 0:f269e3021894 64 __I2C1_CLK_ENABLE();
elessair 0:f269e3021894 65 // Configure I2C1 pins
elessair 0:f269e3021894 66 pinmap_pinout(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 67 pinmap_pinout(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 68 pin_mode(sda, OpenDrain);
elessair 0:f269e3021894 69 pin_mode(scl, OpenDrain);
elessair 0:f269e3021894 70 }
elessair 0:f269e3021894 71
elessair 0:f269e3021894 72 #if defined(I2C2_BASE)
elessair 0:f269e3021894 73 if ((obj->i2c == I2C_2) && !i2c2_inited) {
elessair 0:f269e3021894 74 i2c2_inited = 1;
elessair 0:f269e3021894 75 __I2C2_CLK_ENABLE();
elessair 0:f269e3021894 76 // Configure I2C2 pins
elessair 0:f269e3021894 77 pinmap_pinout(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 78 pinmap_pinout(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 79 pin_mode(sda, OpenDrain);
elessair 0:f269e3021894 80 pin_mode(scl, OpenDrain);
elessair 0:f269e3021894 81 }
elessair 0:f269e3021894 82 #endif
elessair 0:f269e3021894 83
elessair 0:f269e3021894 84 #if defined(I2C3_BASE)
elessair 0:f269e3021894 85 if ((obj->i2c == I2C_3) && !i2c3_inited) {
elessair 0:f269e3021894 86 i2c3_inited = 1;
elessair 0:f269e3021894 87 __I2C3_CLK_ENABLE();
elessair 0:f269e3021894 88 // Configure I2C3 pins
elessair 0:f269e3021894 89 pinmap_pinout(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 90 pinmap_pinout(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 91 pin_mode(sda, OpenDrain);
elessair 0:f269e3021894 92 pin_mode(scl, OpenDrain);
elessair 0:f269e3021894 93 }
elessair 0:f269e3021894 94 #endif
elessair 0:f269e3021894 95
elessair 0:f269e3021894 96 // Reset to clear pending flags if any
elessair 0:f269e3021894 97 i2c_reset(obj);
elessair 0:f269e3021894 98
elessair 0:f269e3021894 99 // I2C configuration
elessair 0:f269e3021894 100 i2c_frequency(obj, 100000); // 100 kHz per default
elessair 0:f269e3021894 101 }
elessair 0:f269e3021894 102
elessair 0:f269e3021894 103 void i2c_frequency(i2c_t *obj, int hz)
elessair 0:f269e3021894 104 {
elessair 0:f269e3021894 105 uint32_t tim = 0;
elessair 0:f269e3021894 106
elessair 0:f269e3021894 107 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
elessair 0:f269e3021894 108
elessair 0:f269e3021894 109 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 110 int timeout;
elessair 0:f269e3021894 111
elessair 0:f269e3021894 112 // wait before init
elessair 0:f269e3021894 113 timeout = LONG_TIMEOUT;
elessair 0:f269e3021894 114 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
elessair 0:f269e3021894 115
elessair 0:f269e3021894 116 /*
elessair 0:f269e3021894 117 Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
elessair 0:f269e3021894 118 * Standard mode (up to 100 kHz)
elessair 0:f269e3021894 119 * Fast Mode (up to 400 kHz)
elessair 0:f269e3021894 120 * Fast Mode Plus (up to 1 MHz)
elessair 0:f269e3021894 121 Below values obtained with:
elessair 0:f269e3021894 122 - I2C clock source = 64 MHz (System Clock w/ HSI) or 72 (System Clock w/ HSE)
elessair 0:f269e3021894 123 - Analog filter delay = ON
elessair 0:f269e3021894 124 - Digital filter coefficient = 0
elessair 0:f269e3021894 125 */
elessair 0:f269e3021894 126 if (SystemCoreClock == 64000000) {
elessair 0:f269e3021894 127 switch (hz) {
elessair 0:f269e3021894 128 case 100000:
elessair 0:f269e3021894 129 tim = 0x10B17DB4; // Standard mode with Rise time = 120ns, Fall time = 120ns
elessair 0:f269e3021894 130 break;
elessair 0:f269e3021894 131 case 400000:
elessair 0:f269e3021894 132 tim = 0x00E22163; // Fast Mode with Rise time = 120ns, Fall time = 120ns
elessair 0:f269e3021894 133 break;
elessair 0:f269e3021894 134 case 1000000:
elessair 0:f269e3021894 135 tim = 0x00A00D1E; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
elessair 0:f269e3021894 136 break;
elessair 0:f269e3021894 137 default:
elessair 0:f269e3021894 138 break;
elessair 0:f269e3021894 139 }
elessair 0:f269e3021894 140 } else if (SystemCoreClock == 72000000) {
elessair 0:f269e3021894 141 switch (hz) {
elessair 0:f269e3021894 142 case 100000:
elessair 0:f269e3021894 143 tim = 0x10D28DCB; // Standard mode with Rise time = 120ns, Fall time = 120ns
elessair 0:f269e3021894 144 break;
elessair 0:f269e3021894 145 case 400000:
elessair 0:f269e3021894 146 tim = 0x00F32571; // Fast Mode with Rise time = 120ns, Fall time = 120ns
elessair 0:f269e3021894 147 break;
elessair 0:f269e3021894 148 case 1000000:
elessair 0:f269e3021894 149 tim = 0x00C00D24; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
elessair 0:f269e3021894 150 break;
elessair 0:f269e3021894 151 default:
elessair 0:f269e3021894 152 break;
elessair 0:f269e3021894 153 }
elessair 0:f269e3021894 154 }
elessair 0:f269e3021894 155
elessair 0:f269e3021894 156 // Enable the Fast Mode Plus capability
elessair 0:f269e3021894 157 if (hz == 1000000) {
elessair 0:f269e3021894 158 if (obj->i2c == I2C_1) {
elessair 0:f269e3021894 159 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C1);
elessair 0:f269e3021894 160 }
elessair 0:f269e3021894 161 #if defined(I2C2_BASE)
elessair 0:f269e3021894 162 if (obj->i2c == I2C_2) {
elessair 0:f269e3021894 163 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C2);
elessair 0:f269e3021894 164 }
elessair 0:f269e3021894 165 #endif
elessair 0:f269e3021894 166 #if defined(I2C3_BASE)
elessair 0:f269e3021894 167 if (obj->i2c == I2C_3) {
elessair 0:f269e3021894 168 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C3);
elessair 0:f269e3021894 169 }
elessair 0:f269e3021894 170 #endif
elessair 0:f269e3021894 171 }
elessair 0:f269e3021894 172
elessair 0:f269e3021894 173 // I2C configuration
elessair 0:f269e3021894 174 I2cHandle.Init.Timing = tim;
elessair 0:f269e3021894 175 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
elessair 0:f269e3021894 176 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
elessair 0:f269e3021894 177 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
elessair 0:f269e3021894 178 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
elessair 0:f269e3021894 179 I2cHandle.Init.OwnAddress1 = 0;
elessair 0:f269e3021894 180 I2cHandle.Init.OwnAddress2 = 0;
elessair 0:f269e3021894 181 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
elessair 0:f269e3021894 182 HAL_I2C_Init(&I2cHandle);
elessair 0:f269e3021894 183 }
elessair 0:f269e3021894 184
elessair 0:f269e3021894 185 inline int i2c_start(i2c_t *obj)
elessair 0:f269e3021894 186 {
elessair 0:f269e3021894 187 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 188 int timeout;
elessair 0:f269e3021894 189
elessair 0:f269e3021894 190 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 191
elessair 0:f269e3021894 192 // Clear Acknowledge failure flag
elessair 0:f269e3021894 193 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
elessair 0:f269e3021894 194
elessair 0:f269e3021894 195 // Wait the STOP condition has been previously correctly sent
elessair 0:f269e3021894 196 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 197 while ((i2c->CR2 & I2C_CR2_STOP) == I2C_CR2_STOP){
elessair 0:f269e3021894 198 if ((timeout--) == 0) {
elessair 0:f269e3021894 199 return 1;
elessair 0:f269e3021894 200 }
elessair 0:f269e3021894 201 }
elessair 0:f269e3021894 202
elessair 0:f269e3021894 203 // Generate the START condition
elessair 0:f269e3021894 204 i2c->CR2 |= I2C_CR2_START;
elessair 0:f269e3021894 205
elessair 0:f269e3021894 206 // Wait the START condition has been correctly sent
elessair 0:f269e3021894 207 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 208 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
elessair 0:f269e3021894 209 if ((timeout--) == 0) {
elessair 0:f269e3021894 210 return 1;
elessair 0:f269e3021894 211 }
elessair 0:f269e3021894 212 }
elessair 0:f269e3021894 213
elessair 0:f269e3021894 214 return 0;
elessair 0:f269e3021894 215 }
elessair 0:f269e3021894 216
elessair 0:f269e3021894 217 inline int i2c_stop(i2c_t *obj)
elessair 0:f269e3021894 218 {
elessair 0:f269e3021894 219 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 220
elessair 0:f269e3021894 221 // Generate the STOP condition
elessair 0:f269e3021894 222 i2c->CR2 |= I2C_CR2_STOP;
elessair 0:f269e3021894 223
elessair 0:f269e3021894 224 return 0;
elessair 0:f269e3021894 225 }
elessair 0:f269e3021894 226
elessair 0:f269e3021894 227 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
elessair 0:f269e3021894 228 {
elessair 0:f269e3021894 229 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 230 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 231 int timeout;
elessair 0:f269e3021894 232 int count;
elessair 0:f269e3021894 233 int value;
elessair 0:f269e3021894 234
elessair 0:f269e3021894 235 /* update CR2 register */
elessair 0:f269e3021894 236 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 237 | (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 238
elessair 0:f269e3021894 239 // Read all bytes
elessair 0:f269e3021894 240 for (count = 0; count < length; count++) {
elessair 0:f269e3021894 241 value = i2c_byte_read(obj, 0);
elessair 0:f269e3021894 242 data[count] = (char)value;
elessair 0:f269e3021894 243 }
elessair 0:f269e3021894 244
elessair 0:f269e3021894 245 // Wait transfer complete
elessair 0:f269e3021894 246 timeout = LONG_TIMEOUT;
elessair 0:f269e3021894 247 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
elessair 0:f269e3021894 248 timeout--;
elessair 0:f269e3021894 249 if (timeout == 0) {
elessair 0:f269e3021894 250 return -1;
elessair 0:f269e3021894 251 }
elessair 0:f269e3021894 252 }
elessair 0:f269e3021894 253
elessair 0:f269e3021894 254 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
elessair 0:f269e3021894 255
elessair 0:f269e3021894 256 // If not repeated start, send stop.
elessair 0:f269e3021894 257 if (stop) {
elessair 0:f269e3021894 258 i2c_stop(obj);
elessair 0:f269e3021894 259 /* Wait until STOPF flag is set */
elessair 0:f269e3021894 260 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 261 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
elessair 0:f269e3021894 262 timeout--;
elessair 0:f269e3021894 263 if (timeout == 0) {
elessair 0:f269e3021894 264 return -1;
elessair 0:f269e3021894 265 }
elessair 0:f269e3021894 266 }
elessair 0:f269e3021894 267 /* Clear STOP Flag */
elessair 0:f269e3021894 268 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
elessair 0:f269e3021894 269 }
elessair 0:f269e3021894 270
elessair 0:f269e3021894 271 return length;
elessair 0:f269e3021894 272 }
elessair 0:f269e3021894 273
elessair 0:f269e3021894 274 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
elessair 0:f269e3021894 275 {
elessair 0:f269e3021894 276 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 277 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 278 int timeout;
elessair 0:f269e3021894 279 int count;
elessair 0:f269e3021894 280
elessair 0:f269e3021894 281 /* update CR2 register */
elessair 0:f269e3021894 282 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 283 | (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 284
elessair 0:f269e3021894 285 for (count = 0; count < length; count++) {
elessair 0:f269e3021894 286 i2c_byte_write(obj, data[count]);
elessair 0:f269e3021894 287 }
elessair 0:f269e3021894 288
elessair 0:f269e3021894 289 // Wait transfer complete
elessair 0:f269e3021894 290 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 291 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
elessair 0:f269e3021894 292 timeout--;
elessair 0:f269e3021894 293 if (timeout == 0) {
elessair 0:f269e3021894 294 return -1;
elessair 0:f269e3021894 295 }
elessair 0:f269e3021894 296 }
elessair 0:f269e3021894 297
elessair 0:f269e3021894 298 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
elessair 0:f269e3021894 299
elessair 0:f269e3021894 300 // If not repeated start, send stop.
elessair 0:f269e3021894 301 if (stop) {
elessair 0:f269e3021894 302 i2c_stop(obj);
elessair 0:f269e3021894 303 /* Wait until STOPF flag is set */
elessair 0:f269e3021894 304 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 305 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
elessair 0:f269e3021894 306 timeout--;
elessair 0:f269e3021894 307 if (timeout == 0) {
elessair 0:f269e3021894 308 return -1;
elessair 0:f269e3021894 309 }
elessair 0:f269e3021894 310 }
elessair 0:f269e3021894 311 /* Clear STOP Flag */
elessair 0:f269e3021894 312 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
elessair 0:f269e3021894 313 }
elessair 0:f269e3021894 314
elessair 0:f269e3021894 315 return count;
elessair 0:f269e3021894 316 }
elessair 0:f269e3021894 317
elessair 0:f269e3021894 318 int i2c_byte_read(i2c_t *obj, int last)
elessair 0:f269e3021894 319 {
elessair 0:f269e3021894 320 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 321 int timeout;
elessair 0:f269e3021894 322
elessair 0:f269e3021894 323 // Wait until the byte is received
elessair 0:f269e3021894 324 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 325 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
elessair 0:f269e3021894 326 if ((timeout--) == 0) {
elessair 0:f269e3021894 327 return -1;
elessair 0:f269e3021894 328 }
elessair 0:f269e3021894 329 }
elessair 0:f269e3021894 330
elessair 0:f269e3021894 331 return (int)i2c->RXDR;
elessair 0:f269e3021894 332 }
elessair 0:f269e3021894 333
elessair 0:f269e3021894 334 int i2c_byte_write(i2c_t *obj, int data)
elessair 0:f269e3021894 335 {
elessair 0:f269e3021894 336 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 337 int timeout;
elessair 0:f269e3021894 338
elessair 0:f269e3021894 339 // Wait until the previous byte is transmitted
elessair 0:f269e3021894 340 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 341 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
elessair 0:f269e3021894 342 if ((timeout--) == 0) {
elessair 0:f269e3021894 343 return 0;
elessair 0:f269e3021894 344 }
elessair 0:f269e3021894 345 }
elessair 0:f269e3021894 346
elessair 0:f269e3021894 347 i2c->TXDR = (uint8_t)data;
elessair 0:f269e3021894 348
elessair 0:f269e3021894 349 return 1;
elessair 0:f269e3021894 350 }
elessair 0:f269e3021894 351
elessair 0:f269e3021894 352 void i2c_reset(i2c_t *obj)
elessair 0:f269e3021894 353 {
elessair 0:f269e3021894 354 int timeout;
elessair 0:f269e3021894 355
elessair 0:f269e3021894 356 // wait before reset
elessair 0:f269e3021894 357 timeout = LONG_TIMEOUT;
elessair 0:f269e3021894 358 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
elessair 0:f269e3021894 359
elessair 0:f269e3021894 360 __I2C1_FORCE_RESET();
elessair 0:f269e3021894 361 __I2C1_RELEASE_RESET();
elessair 0:f269e3021894 362 }
elessair 0:f269e3021894 363
elessair 0:f269e3021894 364 #if DEVICE_I2CSLAVE
elessair 0:f269e3021894 365
elessair 0:f269e3021894 366 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
elessair 0:f269e3021894 367 {
elessair 0:f269e3021894 368 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 369 uint16_t tmpreg;
elessair 0:f269e3021894 370
elessair 0:f269e3021894 371 // disable
elessair 0:f269e3021894 372 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
elessair 0:f269e3021894 373 // Get the old register value
elessair 0:f269e3021894 374 tmpreg = i2c->OAR1;
elessair 0:f269e3021894 375 // Reset address bits
elessair 0:f269e3021894 376 tmpreg &= 0xFC00;
elessair 0:f269e3021894 377 // Set new address
elessair 0:f269e3021894 378 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
elessair 0:f269e3021894 379 // Store the new register value
elessair 0:f269e3021894 380 i2c->OAR1 = tmpreg;
elessair 0:f269e3021894 381 // enable
elessair 0:f269e3021894 382 i2c->OAR1 |= I2C_OAR1_OA1EN;
elessair 0:f269e3021894 383 }
elessair 0:f269e3021894 384
elessair 0:f269e3021894 385 void i2c_slave_mode(i2c_t *obj, int enable_slave)
elessair 0:f269e3021894 386 {
elessair 0:f269e3021894 387
elessair 0:f269e3021894 388 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 389 uint16_t tmpreg;
elessair 0:f269e3021894 390
elessair 0:f269e3021894 391 // Get the old register value
elessair 0:f269e3021894 392 tmpreg = i2c->OAR1;
elessair 0:f269e3021894 393
elessair 0:f269e3021894 394 // Enable / disable slave
elessair 0:f269e3021894 395 if (enable_slave == 1) {
elessair 0:f269e3021894 396 tmpreg |= I2C_OAR1_OA1EN;
elessair 0:f269e3021894 397 } else {
elessair 0:f269e3021894 398 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
elessair 0:f269e3021894 399 }
elessair 0:f269e3021894 400
elessair 0:f269e3021894 401 // Set new mode
elessair 0:f269e3021894 402 i2c->OAR1 = tmpreg;
elessair 0:f269e3021894 403
elessair 0:f269e3021894 404 }
elessair 0:f269e3021894 405
elessair 0:f269e3021894 406 // See I2CSlave.h
elessair 0:f269e3021894 407 #define NoData 0 // the slave has not been addressed
elessair 0:f269e3021894 408 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
elessair 0:f269e3021894 409 #define WriteGeneral 2 // the master is writing to all slave
elessair 0:f269e3021894 410 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
elessair 0:f269e3021894 411
elessair 0:f269e3021894 412 int i2c_slave_receive(i2c_t *obj)
elessair 0:f269e3021894 413 {
elessair 0:f269e3021894 414 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 415 int retValue = NoData;
elessair 0:f269e3021894 416
elessair 0:f269e3021894 417 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
elessair 0:f269e3021894 418 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
elessair 0:f269e3021894 419 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
elessair 0:f269e3021894 420 retValue = ReadAddressed;
elessair 0:f269e3021894 421 else
elessair 0:f269e3021894 422 retValue = WriteAddressed;
elessair 0:f269e3021894 423 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
elessair 0:f269e3021894 424 }
elessair 0:f269e3021894 425 }
elessair 0:f269e3021894 426
elessair 0:f269e3021894 427 return (retValue);
elessair 0:f269e3021894 428 }
elessair 0:f269e3021894 429
elessair 0:f269e3021894 430 int i2c_slave_read(i2c_t *obj, char *data, int length)
elessair 0:f269e3021894 431 {
elessair 0:f269e3021894 432 char size = 0;
elessair 0:f269e3021894 433
elessair 0:f269e3021894 434 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
elessair 0:f269e3021894 435
elessair 0:f269e3021894 436 return size;
elessair 0:f269e3021894 437 }
elessair 0:f269e3021894 438
elessair 0:f269e3021894 439 int i2c_slave_write(i2c_t *obj, const char *data, int length)
elessair 0:f269e3021894 440 {
elessair 0:f269e3021894 441 char size = 0;
elessair 0:f269e3021894 442 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 443
elessair 0:f269e3021894 444 do {
elessair 0:f269e3021894 445 i2c_byte_write(obj, data[size]);
elessair 0:f269e3021894 446 size++;
elessair 0:f269e3021894 447 } while (size < length);
elessair 0:f269e3021894 448
elessair 0:f269e3021894 449 return size;
elessair 0:f269e3021894 450 }
elessair 0:f269e3021894 451
elessair 0:f269e3021894 452
elessair 0:f269e3021894 453 #endif // DEVICE_I2CSLAVE
elessair 0:f269e3021894 454
elessair 0:f269e3021894 455 #endif // DEVICE_I2C