b luo / mbed-dev

mbed library sources. With a patch for the can_api

Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32F3/i2c_api.c@151:91825d030f9b, 2016-11-14 (annotated)

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

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 *******************************************************************************
<> 149:156823d33999 3 * Copyright (c) 2014, STMicroelectronics
<> 149:156823d33999 4 * All rights reserved.
<> 149:156823d33999 5 *
<> 149:156823d33999 6 * Redistribution and use in source and binary forms, with or without
<> 149:156823d33999 7 * modification, are permitted provided that the following conditions are met:
<> 149:156823d33999 8 *
<> 149:156823d33999 9 * 1. Redistributions of source code must retain the above copyright notice,
<> 149:156823d33999 10 * this list of conditions and the following disclaimer.
<> 149:156823d33999 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 149:156823d33999 12 * this list of conditions and the following disclaimer in the documentation
<> 149:156823d33999 13 * and/or other materials provided with the distribution.
<> 149:156823d33999 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 149:156823d33999 15 * may be used to endorse or promote products derived from this software
<> 149:156823d33999 16 * without specific prior written permission.
<> 149:156823d33999 17 *
<> 149:156823d33999 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 149:156823d33999 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 149:156823d33999 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 149:156823d33999 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 149:156823d33999 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 149:156823d33999 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 149:156823d33999 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 149:156823d33999 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 149:156823d33999 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 149:156823d33999 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 149:156823d33999 28 *******************************************************************************
<> 149:156823d33999 29 */
<> 149:156823d33999 30 #include "mbed_assert.h"
<> 149:156823d33999 31 #include "i2c_api.h"
<> 149:156823d33999 32
<> 149:156823d33999 33 #if DEVICE_I2C
<> 149:156823d33999 34
<> 149:156823d33999 35 #include "cmsis.h"
<> 149:156823d33999 36 #include "pinmap.h"
<> 149:156823d33999 37 #include "PeripheralPins.h"
<> 149:156823d33999 38
<> 149:156823d33999 39 /* Timeout values for flags and events waiting loops. These timeouts are
<> 149:156823d33999 40 not based on accurate values, they just guarantee that the application will
<> 149:156823d33999 41 not remain stuck if the I2C communication is corrupted. */
<> 149:156823d33999 42 #define FLAG_TIMEOUT ((int)0x4000)
<> 149:156823d33999 43 #define LONG_TIMEOUT ((int)0x8000)
<> 149:156823d33999 44
<> 149:156823d33999 45 I2C_HandleTypeDef I2cHandle;
<> 149:156823d33999 46
<> 149:156823d33999 47 int i2c1_inited = 0;
<> 149:156823d33999 48 int i2c2_inited = 0;
<> 149:156823d33999 49 int i2c3_inited = 0;
<> 149:156823d33999 50
<> 149:156823d33999 51 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
<> 149:156823d33999 52 {
<> 149:156823d33999 53 // Determine the I2C to use
<> 149:156823d33999 54 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
<> 149:156823d33999 55 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
<> 149:156823d33999 56
<> 149:156823d33999 57 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
<> 149:156823d33999 58 MBED_ASSERT(obj->i2c != (I2CName)NC);
<> 149:156823d33999 59
<> 149:156823d33999 60 // Enable I2C clock and pinout if not done
<> 149:156823d33999 61 if ((obj->i2c == I2C_1) && !i2c1_inited) {
<> 149:156823d33999 62 i2c1_inited = 1;
<> 149:156823d33999 63 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
<> 149:156823d33999 64 __I2C1_CLK_ENABLE();
<> 149:156823d33999 65 // Configure I2C1 pins
<> 149:156823d33999 66 pinmap_pinout(sda, PinMap_I2C_SDA);
<> 149:156823d33999 67 pinmap_pinout(scl, PinMap_I2C_SCL);
<> 149:156823d33999 68 pin_mode(sda, OpenDrain);
<> 149:156823d33999 69 pin_mode(scl, OpenDrain);
<> 149:156823d33999 70 }
<> 149:156823d33999 71
<> 149:156823d33999 72 #if defined(I2C2_BASE)
<> 149:156823d33999 73 if ((obj->i2c == I2C_2) && !i2c2_inited) {
<> 149:156823d33999 74 i2c2_inited = 1;
<> 149:156823d33999 75 __I2C2_CLK_ENABLE();
<> 149:156823d33999 76 // Configure I2C2 pins
<> 149:156823d33999 77 pinmap_pinout(sda, PinMap_I2C_SDA);
<> 149:156823d33999 78 pinmap_pinout(scl, PinMap_I2C_SCL);
<> 149:156823d33999 79 pin_mode(sda, OpenDrain);
<> 149:156823d33999 80 pin_mode(scl, OpenDrain);
<> 149:156823d33999 81 }
<> 149:156823d33999 82 #endif
<> 149:156823d33999 83
<> 149:156823d33999 84 #if defined(I2C3_BASE)
<> 149:156823d33999 85 if ((obj->i2c == I2C_3) && !i2c3_inited) {
<> 149:156823d33999 86 i2c3_inited = 1;
<> 149:156823d33999 87 __I2C3_CLK_ENABLE();
<> 149:156823d33999 88 // Configure I2C3 pins
<> 149:156823d33999 89 pinmap_pinout(sda, PinMap_I2C_SDA);
<> 149:156823d33999 90 pinmap_pinout(scl, PinMap_I2C_SCL);
<> 149:156823d33999 91 pin_mode(sda, OpenDrain);
<> 149:156823d33999 92 pin_mode(scl, OpenDrain);
<> 149:156823d33999 93 }
<> 149:156823d33999 94 #endif
<> 149:156823d33999 95
<> 149:156823d33999 96 // Reset to clear pending flags if any
<> 149:156823d33999 97 i2c_reset(obj);
<> 149:156823d33999 98
<> 149:156823d33999 99 // I2C configuration
<> 149:156823d33999 100 i2c_frequency(obj, 100000); // 100 kHz per default
<> 149:156823d33999 101 }
<> 149:156823d33999 102
<> 149:156823d33999 103 void i2c_frequency(i2c_t *obj, int hz)
<> 149:156823d33999 104 {
<> 149:156823d33999 105 uint32_t tim = 0;
<> 149:156823d33999 106
<> 149:156823d33999 107 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
<> 149:156823d33999 108
<> 149:156823d33999 109 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 149:156823d33999 110 int timeout;
<> 149:156823d33999 111
<> 149:156823d33999 112 // wait before init
<> 149:156823d33999 113 timeout = LONG_TIMEOUT;
<> 149:156823d33999 114 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
<> 149:156823d33999 115
<> 149:156823d33999 116 /*
<> 149:156823d33999 117 Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
<> 149:156823d33999 118 * Standard mode (up to 100 kHz)
<> 149:156823d33999 119 * Fast Mode (up to 400 kHz)
<> 149:156823d33999 120 * Fast Mode Plus (up to 1 MHz)
<> 149:156823d33999 121 Below values obtained with:
<> 149:156823d33999 122 - I2C clock source = 64 MHz (System Clock w/ HSI) or 72 (System Clock w/ HSE)
<> 149:156823d33999 123 - Analog filter delay = ON
<> 149:156823d33999 124 - Digital filter coefficient = 0
<> 149:156823d33999 125 */
<> 149:156823d33999 126 if (SystemCoreClock == 64000000) {
<> 149:156823d33999 127 switch (hz) {
<> 149:156823d33999 128 case 100000:
<> 149:156823d33999 129 tim = 0x10B17DB4; // Standard mode with Rise time = 120ns, Fall time = 120ns
<> 149:156823d33999 130 break;
<> 149:156823d33999 131 case 400000:
<> 149:156823d33999 132 tim = 0x00E22163; // Fast Mode with Rise time = 120ns, Fall time = 120ns
<> 149:156823d33999 133 break;
<> 149:156823d33999 134 case 1000000:
<> 149:156823d33999 135 tim = 0x00A00D1E; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
<> 149:156823d33999 136 break;
<> 149:156823d33999 137 default:
<> 149:156823d33999 138 break;
<> 149:156823d33999 139 }
<> 149:156823d33999 140 } else if (SystemCoreClock == 72000000) {
<> 149:156823d33999 141 switch (hz) {
<> 149:156823d33999 142 case 100000:
<> 149:156823d33999 143 tim = 0x10D28DCB; // Standard mode with Rise time = 120ns, Fall time = 120ns
<> 149:156823d33999 144 break;
<> 149:156823d33999 145 case 400000:
<> 149:156823d33999 146 tim = 0x00F32571; // Fast Mode with Rise time = 120ns, Fall time = 120ns
<> 149:156823d33999 147 break;
<> 149:156823d33999 148 case 1000000:
<> 149:156823d33999 149 tim = 0x00C00D24; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
<> 149:156823d33999 150 break;
<> 149:156823d33999 151 default:
<> 149:156823d33999 152 break;
<> 149:156823d33999 153 }
<> 149:156823d33999 154 }
<> 149:156823d33999 155
<> 149:156823d33999 156 // Enable the Fast Mode Plus capability
<> 149:156823d33999 157 if (hz == 1000000) {
<> 149:156823d33999 158 if (obj->i2c == I2C_1) {
<> 149:156823d33999 159 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C1);
<> 149:156823d33999 160 }
<> 149:156823d33999 161 #if defined(I2C2_BASE)
<> 149:156823d33999 162 if (obj->i2c == I2C_2) {
<> 149:156823d33999 163 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C2);
<> 149:156823d33999 164 }
<> 149:156823d33999 165 #endif
<> 149:156823d33999 166 #if defined(I2C3_BASE)
<> 149:156823d33999 167 if (obj->i2c == I2C_3) {
<> 149:156823d33999 168 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C3);
<> 149:156823d33999 169 }
<> 149:156823d33999 170 #endif
<> 149:156823d33999 171 }
<> 149:156823d33999 172
<> 149:156823d33999 173 // I2C configuration
<> 149:156823d33999 174 I2cHandle.Init.Timing = tim;
<> 149:156823d33999 175 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
<> 149:156823d33999 176 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
<> 149:156823d33999 177 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
<> 149:156823d33999 178 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
<> 149:156823d33999 179 I2cHandle.Init.OwnAddress1 = 0;
<> 149:156823d33999 180 I2cHandle.Init.OwnAddress2 = 0;
<> 149:156823d33999 181 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
<> 149:156823d33999 182 HAL_I2C_Init(&I2cHandle);
<> 149:156823d33999 183 }
<> 149:156823d33999 184
<> 149:156823d33999 185 inline int i2c_start(i2c_t *obj)
<> 149:156823d33999 186 {
<> 149:156823d33999 187 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 149:156823d33999 188 int timeout;
<> 149:156823d33999 189
<> 149:156823d33999 190 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 149:156823d33999 191
<> 149:156823d33999 192 // Clear Acknowledge failure flag
<> 149:156823d33999 193 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
<> 149:156823d33999 194
<> 149:156823d33999 195 // Wait the STOP condition has been previously correctly sent
<> 149:156823d33999 196 timeout = FLAG_TIMEOUT;
<> 149:156823d33999 197 while ((i2c->CR2 & I2C_CR2_STOP) == I2C_CR2_STOP){
<> 149:156823d33999 198 if ((timeout--) == 0) {
<> 149:156823d33999 199 return 1;
<> 149:156823d33999 200 }
<> 149:156823d33999 201 }
<> 149:156823d33999 202
<> 149:156823d33999 203 // Generate the START condition
<> 149:156823d33999 204 i2c->CR2 |= I2C_CR2_START;
<> 149:156823d33999 205
<> 149:156823d33999 206 // Wait the START condition has been correctly sent
<> 149:156823d33999 207 timeout = FLAG_TIMEOUT;
<> 149:156823d33999 208 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
<> 149:156823d33999 209 if ((timeout--) == 0) {
<> 149:156823d33999 210 return 1;
<> 149:156823d33999 211 }
<> 149:156823d33999 212 }
<> 149:156823d33999 213
<> 149:156823d33999 214 return 0;
<> 149:156823d33999 215 }
<> 149:156823d33999 216
<> 149:156823d33999 217 inline int i2c_stop(i2c_t *obj)
<> 149:156823d33999 218 {
<> 149:156823d33999 219 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 149:156823d33999 220
<> 149:156823d33999 221 // Generate the STOP condition
<> 149:156823d33999 222 i2c->CR2 |= I2C_CR2_STOP;
<> 149:156823d33999 223
<> 149:156823d33999 224 return 0;
<> 149:156823d33999 225 }
<> 149:156823d33999 226
<> 149:156823d33999 227 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
<> 149:156823d33999 228 {
<> 149:156823d33999 229 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 149:156823d33999 230 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 149:156823d33999 231 int timeout;
<> 149:156823d33999 232 int count;
<> 149:156823d33999 233 int value;
<> 149:156823d33999 234
<> 149:156823d33999 235 /* update CR2 register */
<> 149:156823d33999 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)))
<> 149:156823d33999 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);
<> 149:156823d33999 238
<> 149:156823d33999 239 // Read all bytes
<> 149:156823d33999 240 for (count = 0; count < length; count++) {
<> 149:156823d33999 241 value = i2c_byte_read(obj, 0);
<> 149:156823d33999 242 data[count] = (char)value;
<> 149:156823d33999 243 }
<> 149:156823d33999 244
<> 149:156823d33999 245 // Wait transfer complete
<> 149:156823d33999 246 timeout = LONG_TIMEOUT;
<> 149:156823d33999 247 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
<> 149:156823d33999 248 timeout--;
<> 149:156823d33999 249 if (timeout == 0) {
<> 149:156823d33999 250 return -1;
<> 149:156823d33999 251 }
<> 149:156823d33999 252 }
<> 149:156823d33999 253
<> 149:156823d33999 254 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
<> 149:156823d33999 255
<> 149:156823d33999 256 // If not repeated start, send stop.
<> 149:156823d33999 257 if (stop) {
<> 149:156823d33999 258 i2c_stop(obj);
<> 149:156823d33999 259 /* Wait until STOPF flag is set */
<> 149:156823d33999 260 timeout = FLAG_TIMEOUT;
<> 149:156823d33999 261 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
<> 149:156823d33999 262 timeout--;
<> 149:156823d33999 263 if (timeout == 0) {
<> 149:156823d33999 264 return -1;
<> 149:156823d33999 265 }
<> 149:156823d33999 266 }
<> 149:156823d33999 267 /* Clear STOP Flag */
<> 149:156823d33999 268 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
<> 149:156823d33999 269 }
<> 149:156823d33999 270
<> 149:156823d33999 271 return length;
<> 149:156823d33999 272 }
<> 149:156823d33999 273
<> 149:156823d33999 274 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
<> 149:156823d33999 275 {
<> 149:156823d33999 276 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 149:156823d33999 277 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 149:156823d33999 278 int timeout;
<> 149:156823d33999 279 int count;
<> 149:156823d33999 280
<> 149:156823d33999 281 /* update CR2 register */
<> 149:156823d33999 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)))
<> 149:156823d33999 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);
<> 149:156823d33999 284
<> 149:156823d33999 285 for (count = 0; count < length; count++) {
<> 149:156823d33999 286 i2c_byte_write(obj, data[count]);
<> 149:156823d33999 287 }
<> 149:156823d33999 288
<> 149:156823d33999 289 // Wait transfer complete
<> 149:156823d33999 290 timeout = FLAG_TIMEOUT;
<> 149:156823d33999 291 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
<> 149:156823d33999 292 timeout--;
<> 149:156823d33999 293 if (timeout == 0) {
<> 149:156823d33999 294 return -1;
<> 149:156823d33999 295 }
<> 149:156823d33999 296 }
<> 149:156823d33999 297
<> 149:156823d33999 298 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
<> 149:156823d33999 299
<> 149:156823d33999 300 // If not repeated start, send stop.
<> 149:156823d33999 301 if (stop) {
<> 149:156823d33999 302 i2c_stop(obj);
<> 149:156823d33999 303 /* Wait until STOPF flag is set */
<> 149:156823d33999 304 timeout = FLAG_TIMEOUT;
<> 149:156823d33999 305 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
<> 149:156823d33999 306 timeout--;
<> 149:156823d33999 307 if (timeout == 0) {
<> 149:156823d33999 308 return -1;
<> 149:156823d33999 309 }
<> 149:156823d33999 310 }
<> 149:156823d33999 311 /* Clear STOP Flag */
<> 149:156823d33999 312 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
<> 149:156823d33999 313 }
<> 149:156823d33999 314
<> 149:156823d33999 315 return count;
<> 149:156823d33999 316 }
<> 149:156823d33999 317
<> 149:156823d33999 318 int i2c_byte_read(i2c_t *obj, int last)
<> 149:156823d33999 319 {
<> 149:156823d33999 320 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 149:156823d33999 321 int timeout;
<> 149:156823d33999 322
<> 149:156823d33999 323 // Wait until the byte is received
<> 149:156823d33999 324 timeout = FLAG_TIMEOUT;
<> 149:156823d33999 325 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
<> 149:156823d33999 326 if ((timeout--) == 0) {
<> 149:156823d33999 327 return -1;
<> 149:156823d33999 328 }
<> 149:156823d33999 329 }
<> 149:156823d33999 330
<> 149:156823d33999 331 return (int)i2c->RXDR;
<> 149:156823d33999 332 }
<> 149:156823d33999 333
<> 149:156823d33999 334 int i2c_byte_write(i2c_t *obj, int data)
<> 149:156823d33999 335 {
<> 149:156823d33999 336 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 149:156823d33999 337 int timeout;
<> 149:156823d33999 338
<> 149:156823d33999 339 // Wait until the previous byte is transmitted
<> 149:156823d33999 340 timeout = FLAG_TIMEOUT;
<> 149:156823d33999 341 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
<> 149:156823d33999 342 if ((timeout--) == 0) {
<> 149:156823d33999 343 return 0;
<> 149:156823d33999 344 }
<> 149:156823d33999 345 }
<> 149:156823d33999 346
<> 149:156823d33999 347 i2c->TXDR = (uint8_t)data;
<> 149:156823d33999 348
<> 149:156823d33999 349 return 1;
<> 149:156823d33999 350 }
<> 149:156823d33999 351
<> 149:156823d33999 352 void i2c_reset(i2c_t *obj)
<> 149:156823d33999 353 {
<> 149:156823d33999 354 int timeout;
<> 149:156823d33999 355
<> 149:156823d33999 356 // wait before reset
<> 149:156823d33999 357 timeout = LONG_TIMEOUT;
<> 149:156823d33999 358 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
<> 149:156823d33999 359
<> 149:156823d33999 360 __I2C1_FORCE_RESET();
<> 149:156823d33999 361 __I2C1_RELEASE_RESET();
<> 149:156823d33999 362 }
<> 149:156823d33999 363
<> 149:156823d33999 364 #if DEVICE_I2CSLAVE
<> 149:156823d33999 365
<> 149:156823d33999 366 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
<> 149:156823d33999 367 {
<> 149:156823d33999 368 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 149:156823d33999 369 uint16_t tmpreg;
<> 149:156823d33999 370
<> 149:156823d33999 371 // disable
<> 149:156823d33999 372 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
<> 149:156823d33999 373 // Get the old register value
<> 149:156823d33999 374 tmpreg = i2c->OAR1;
<> 149:156823d33999 375 // Reset address bits
<> 149:156823d33999 376 tmpreg &= 0xFC00;
<> 149:156823d33999 377 // Set new address
<> 149:156823d33999 378 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
<> 149:156823d33999 379 // Store the new register value
<> 149:156823d33999 380 i2c->OAR1 = tmpreg;
<> 149:156823d33999 381 // enable
<> 149:156823d33999 382 i2c->OAR1 |= I2C_OAR1_OA1EN;
<> 149:156823d33999 383 }
<> 149:156823d33999 384
<> 149:156823d33999 385 void i2c_slave_mode(i2c_t *obj, int enable_slave)
<> 149:156823d33999 386 {
<> 149:156823d33999 387
<> 149:156823d33999 388 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 149:156823d33999 389 uint16_t tmpreg;
<> 149:156823d33999 390
<> 149:156823d33999 391 // Get the old register value
<> 149:156823d33999 392 tmpreg = i2c->OAR1;
<> 149:156823d33999 393
<> 149:156823d33999 394 // Enable / disable slave
<> 149:156823d33999 395 if (enable_slave == 1) {
<> 149:156823d33999 396 tmpreg |= I2C_OAR1_OA1EN;
<> 149:156823d33999 397 } else {
<> 149:156823d33999 398 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
<> 149:156823d33999 399 }
<> 149:156823d33999 400
<> 149:156823d33999 401 // Set new mode
<> 149:156823d33999 402 i2c->OAR1 = tmpreg;
<> 149:156823d33999 403
<> 149:156823d33999 404 }
<> 149:156823d33999 405
<> 149:156823d33999 406 // See I2CSlave.h
<> 149:156823d33999 407 #define NoData 0 // the slave has not been addressed
<> 149:156823d33999 408 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
<> 149:156823d33999 409 #define WriteGeneral 2 // the master is writing to all slave
<> 149:156823d33999 410 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
<> 149:156823d33999 411
<> 149:156823d33999 412 int i2c_slave_receive(i2c_t *obj)
<> 149:156823d33999 413 {
<> 149:156823d33999 414 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 149:156823d33999 415 int retValue = NoData;
<> 149:156823d33999 416
<> 149:156823d33999 417 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
<> 149:156823d33999 418 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
<> 149:156823d33999 419 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
<> 149:156823d33999 420 retValue = ReadAddressed;
<> 149:156823d33999 421 else
<> 149:156823d33999 422 retValue = WriteAddressed;
<> 149:156823d33999 423 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
<> 149:156823d33999 424 }
<> 149:156823d33999 425 }
<> 149:156823d33999 426
<> 149:156823d33999 427 return (retValue);
<> 149:156823d33999 428 }
<> 149:156823d33999 429
<> 149:156823d33999 430 int i2c_slave_read(i2c_t *obj, char *data, int length)
<> 149:156823d33999 431 {
<> 149:156823d33999 432 char size = 0;
<> 149:156823d33999 433
<> 149:156823d33999 434 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
<> 149:156823d33999 435
<> 149:156823d33999 436 return size;
<> 149:156823d33999 437 }
<> 149:156823d33999 438
<> 149:156823d33999 439 int i2c_slave_write(i2c_t *obj, const char *data, int length)
<> 149:156823d33999 440 {
<> 149:156823d33999 441 char size = 0;
<> 149:156823d33999 442 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 149:156823d33999 443
<> 149:156823d33999 444 do {
<> 149:156823d33999 445 i2c_byte_write(obj, data[size]);
<> 149:156823d33999 446 size++;
<> 149:156823d33999 447 } while (size < length);
<> 149:156823d33999 448
<> 149:156823d33999 449 return size;
<> 149:156823d33999 450 }
<> 149:156823d33999 451
<> 149:156823d33999 452
<> 149:156823d33999 453 #endif // DEVICE_I2CSLAVE
<> 149:156823d33999 454
<> 149:156823d33999 455 #endif // DEVICE_I2C