PHung Tung / SRC_STM32F7

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targets/hal/TARGET_STM/TARGET_STM32F7/i2c_api.c@0:e87aa4c49e95, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 21:51:46 2019 +0000
Revision:
0:e87aa4c49e95
libray

Who changed what in which revision?

UserRevisionLine numberNew contents of line
phungductung 0:e87aa4c49e95 1 /* mbed Microcontroller Library
phungductung 0:e87aa4c49e95 2 *******************************************************************************
phungductung 0:e87aa4c49e95 3 * Copyright (c) 2015, STMicroelectronics
phungductung 0:e87aa4c49e95 4 * All rights reserved.
phungductung 0:e87aa4c49e95 5 *
phungductung 0:e87aa4c49e95 6 * Redistribution and use in source and binary forms, with or without
phungductung 0:e87aa4c49e95 7 * modification, are permitted provided that the following conditions are met:
phungductung 0:e87aa4c49e95 8 *
phungductung 0:e87aa4c49e95 9 * 1. Redistributions of source code must retain the above copyright notice,
phungductung 0:e87aa4c49e95 10 * this list of conditions and the following disclaimer.
phungductung 0:e87aa4c49e95 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
phungductung 0:e87aa4c49e95 12 * this list of conditions and the following disclaimer in the documentation
phungductung 0:e87aa4c49e95 13 * and/or other materials provided with the distribution.
phungductung 0:e87aa4c49e95 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
phungductung 0:e87aa4c49e95 15 * may be used to endorse or promote products derived from this software
phungductung 0:e87aa4c49e95 16 * without specific prior written permission.
phungductung 0:e87aa4c49e95 17 *
phungductung 0:e87aa4c49e95 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
phungductung 0:e87aa4c49e95 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
phungductung 0:e87aa4c49e95 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
phungductung 0:e87aa4c49e95 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
phungductung 0:e87aa4c49e95 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
phungductung 0:e87aa4c49e95 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
phungductung 0:e87aa4c49e95 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
phungductung 0:e87aa4c49e95 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
phungductung 0:e87aa4c49e95 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
phungductung 0:e87aa4c49e95 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
phungductung 0:e87aa4c49e95 28 *******************************************************************************
phungductung 0:e87aa4c49e95 29 */
phungductung 0:e87aa4c49e95 30 #include "mbed_assert.h"
phungductung 0:e87aa4c49e95 31 #include "i2c_api.h"
phungductung 0:e87aa4c49e95 32
phungductung 0:e87aa4c49e95 33 #if DEVICE_I2C
phungductung 0:e87aa4c49e95 34
phungductung 0:e87aa4c49e95 35 #include "cmsis.h"
phungductung 0:e87aa4c49e95 36 #include "pinmap.h"
phungductung 0:e87aa4c49e95 37 #include "PeripheralPins.h"
phungductung 0:e87aa4c49e95 38 #include "mbed_error.h"
phungductung 0:e87aa4c49e95 39
phungductung 0:e87aa4c49e95 40 /* Timeout values for flags and events waiting loops. These timeouts are
phungductung 0:e87aa4c49e95 41 not based on accurate values, they just guarantee that the application will
phungductung 0:e87aa4c49e95 42 not remain stuck if the I2C communication is corrupted. */
phungductung 0:e87aa4c49e95 43 #define FLAG_TIMEOUT ((int)0x4000)
phungductung 0:e87aa4c49e95 44 #define LONG_TIMEOUT ((int)0x8000)
phungductung 0:e87aa4c49e95 45
phungductung 0:e87aa4c49e95 46 I2C_HandleTypeDef I2cHandle;
phungductung 0:e87aa4c49e95 47
phungductung 0:e87aa4c49e95 48 int i2c1_inited = 0;
phungductung 0:e87aa4c49e95 49 int i2c2_inited = 0;
phungductung 0:e87aa4c49e95 50 int i2c3_inited = 0;
phungductung 0:e87aa4c49e95 51 int i2c4_inited = 0;
phungductung 0:e87aa4c49e95 52
phungductung 0:e87aa4c49e95 53
phungductung 0:e87aa4c49e95 54 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
phungductung 0:e87aa4c49e95 55 {
phungductung 0:e87aa4c49e95 56 // Determine the I2C to use
phungductung 0:e87aa4c49e95 57 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
phungductung 0:e87aa4c49e95 58 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
phungductung 0:e87aa4c49e95 59
phungductung 0:e87aa4c49e95 60 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
phungductung 0:e87aa4c49e95 61 MBED_ASSERT(obj->i2c != (I2CName)NC);
phungductung 0:e87aa4c49e95 62
phungductung 0:e87aa4c49e95 63 // Enable I2C clock and pinout if not done
phungductung 0:e87aa4c49e95 64 if ((obj->i2c == I2C_1) && !i2c1_inited) {
phungductung 0:e87aa4c49e95 65 i2c1_inited = 1;
phungductung 0:e87aa4c49e95 66 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_PCLK1);
phungductung 0:e87aa4c49e95 67 __HAL_RCC_I2C1_CLK_ENABLE();
phungductung 0:e87aa4c49e95 68 // Configure I2C1 pins
phungductung 0:e87aa4c49e95 69 pinmap_pinout(sda, PinMap_I2C_SDA);
phungductung 0:e87aa4c49e95 70 pinmap_pinout(scl, PinMap_I2C_SCL);
phungductung 0:e87aa4c49e95 71 pin_mode(sda, OpenDrain);
phungductung 0:e87aa4c49e95 72 pin_mode(scl, OpenDrain);
phungductung 0:e87aa4c49e95 73 }
phungductung 0:e87aa4c49e95 74
phungductung 0:e87aa4c49e95 75 #if defined(I2C2_BASE)
phungductung 0:e87aa4c49e95 76 if ((obj->i2c == I2C_2) && !i2c2_inited) {
phungductung 0:e87aa4c49e95 77 i2c2_inited = 1;
phungductung 0:e87aa4c49e95 78 __HAL_RCC_I2C2_CONFIG(RCC_I2C2CLKSOURCE_PCLK1);
phungductung 0:e87aa4c49e95 79 __HAL_RCC_I2C2_CLK_ENABLE();
phungductung 0:e87aa4c49e95 80 // Configure I2C2 pins
phungductung 0:e87aa4c49e95 81 pinmap_pinout(sda, PinMap_I2C_SDA);
phungductung 0:e87aa4c49e95 82 pinmap_pinout(scl, PinMap_I2C_SCL);
phungductung 0:e87aa4c49e95 83 pin_mode(sda, OpenDrain);
phungductung 0:e87aa4c49e95 84 pin_mode(scl, OpenDrain);
phungductung 0:e87aa4c49e95 85 }
phungductung 0:e87aa4c49e95 86 #endif
phungductung 0:e87aa4c49e95 87
phungductung 0:e87aa4c49e95 88 #if defined(I2C3_BASE)
phungductung 0:e87aa4c49e95 89 if ((obj->i2c == I2C_3) && !i2c3_inited) {
phungductung 0:e87aa4c49e95 90 i2c3_inited = 1;
phungductung 0:e87aa4c49e95 91 __HAL_RCC_I2C3_CONFIG(RCC_I2C3CLKSOURCE_PCLK1);
phungductung 0:e87aa4c49e95 92 __HAL_RCC_I2C3_CLK_ENABLE();
phungductung 0:e87aa4c49e95 93 // Configure I2C3 pins
phungductung 0:e87aa4c49e95 94 pinmap_pinout(sda, PinMap_I2C_SDA);
phungductung 0:e87aa4c49e95 95 pinmap_pinout(scl, PinMap_I2C_SCL);
phungductung 0:e87aa4c49e95 96 pin_mode(sda, OpenDrain);
phungductung 0:e87aa4c49e95 97 pin_mode(scl, OpenDrain);
phungductung 0:e87aa4c49e95 98 }
phungductung 0:e87aa4c49e95 99 #endif
phungductung 0:e87aa4c49e95 100
phungductung 0:e87aa4c49e95 101 #if defined(I2C4_BASE)
phungductung 0:e87aa4c49e95 102 if ((obj->i2c == I2C_4) && !i2c4_inited) {
phungductung 0:e87aa4c49e95 103 i2c4_inited = 1;
phungductung 0:e87aa4c49e95 104 __HAL_RCC_I2C4_CONFIG(RCC_I2C4CLKSOURCE_PCLK1);
phungductung 0:e87aa4c49e95 105 __HAL_RCC_I2C4_CLK_ENABLE();
phungductung 0:e87aa4c49e95 106 // Configure I2C4 pins
phungductung 0:e87aa4c49e95 107 pinmap_pinout(sda, PinMap_I2C_SDA);
phungductung 0:e87aa4c49e95 108 pinmap_pinout(scl, PinMap_I2C_SCL);
phungductung 0:e87aa4c49e95 109 pin_mode(sda, OpenDrain);
phungductung 0:e87aa4c49e95 110 pin_mode(scl, OpenDrain);
phungductung 0:e87aa4c49e95 111 }
phungductung 0:e87aa4c49e95 112 #endif
phungductung 0:e87aa4c49e95 113
phungductung 0:e87aa4c49e95 114 // Reset to clear pending flags if any
phungductung 0:e87aa4c49e95 115 i2c_reset(obj);
phungductung 0:e87aa4c49e95 116
phungductung 0:e87aa4c49e95 117 // I2C configuration
phungductung 0:e87aa4c49e95 118 i2c_frequency(obj, 100000); // 100 kHz per default
phungductung 0:e87aa4c49e95 119 }
phungductung 0:e87aa4c49e95 120
phungductung 0:e87aa4c49e95 121 void i2c_frequency(i2c_t *obj, int hz)
phungductung 0:e87aa4c49e95 122 {
phungductung 0:e87aa4c49e95 123 uint32_t tim = 0;
phungductung 0:e87aa4c49e95 124
phungductung 0:e87aa4c49e95 125 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
phungductung 0:e87aa4c49e95 126
phungductung 0:e87aa4c49e95 127 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
phungductung 0:e87aa4c49e95 128 int timeout;
phungductung 0:e87aa4c49e95 129
phungductung 0:e87aa4c49e95 130 // wait before init
phungductung 0:e87aa4c49e95 131 timeout = LONG_TIMEOUT;
phungductung 0:e87aa4c49e95 132 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0)) {}
phungductung 0:e87aa4c49e95 133
phungductung 0:e87aa4c49e95 134 /*
phungductung 0:e87aa4c49e95 135 Values calculated with I2C_Timing_Configuration tool (excel file)
phungductung 0:e87aa4c49e95 136 * Standard mode (up to 100 kHz)
phungductung 0:e87aa4c49e95 137 * Fast Mode (up to 400 kHz)
phungductung 0:e87aa4c49e95 138 * Fast Mode Plus (up to 1 MHz)
phungductung 0:e87aa4c49e95 139 Below values obtained with:
phungductung 0:e87aa4c49e95 140 - I2Cx clock source = APB1CLK = 54 MHz
phungductung 0:e87aa4c49e95 141 - Analog filter delay = ON
phungductung 0:e87aa4c49e95 142 - Digital filter coefficient = 0
phungductung 0:e87aa4c49e95 143 */
phungductung 0:e87aa4c49e95 144 switch (hz) {
phungductung 0:e87aa4c49e95 145 case 100000:
phungductung 0:e87aa4c49e95 146 tim = 0x10916998; // Standard mode with Rise time = 120ns, Fall time = 120ns
phungductung 0:e87aa4c49e95 147 break;
phungductung 0:e87aa4c49e95 148 case 400000:
phungductung 0:e87aa4c49e95 149 tim = 0x00B11B54; // Fast Mode with Rise time = 120ns, Fall time = 120ns
phungductung 0:e87aa4c49e95 150 break;
phungductung 0:e87aa4c49e95 151 case 1000000:
phungductung 0:e87aa4c49e95 152 tim = 0x0090091B; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
phungductung 0:e87aa4c49e95 153 break;
phungductung 0:e87aa4c49e95 154 default:
phungductung 0:e87aa4c49e95 155 break;
phungductung 0:e87aa4c49e95 156 }
phungductung 0:e87aa4c49e95 157
phungductung 0:e87aa4c49e95 158 // I2C configuration
phungductung 0:e87aa4c49e95 159 I2cHandle.Init.Timing = tim;
phungductung 0:e87aa4c49e95 160 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
phungductung 0:e87aa4c49e95 161 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
phungductung 0:e87aa4c49e95 162 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
phungductung 0:e87aa4c49e95 163 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
phungductung 0:e87aa4c49e95 164 I2cHandle.Init.OwnAddress1 = 0;
phungductung 0:e87aa4c49e95 165 I2cHandle.Init.OwnAddress2 = 0;
phungductung 0:e87aa4c49e95 166 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
phungductung 0:e87aa4c49e95 167
phungductung 0:e87aa4c49e95 168 if (HAL_I2C_Init(&I2cHandle) != HAL_OK) {
phungductung 0:e87aa4c49e95 169 error("Cannot initialize I2C");
phungductung 0:e87aa4c49e95 170 }
phungductung 0:e87aa4c49e95 171 }
phungductung 0:e87aa4c49e95 172
phungductung 0:e87aa4c49e95 173 inline int i2c_start(i2c_t *obj)
phungductung 0:e87aa4c49e95 174 {
phungductung 0:e87aa4c49e95 175 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
phungductung 0:e87aa4c49e95 176 int timeout;
phungductung 0:e87aa4c49e95 177
phungductung 0:e87aa4c49e95 178 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
phungductung 0:e87aa4c49e95 179
phungductung 0:e87aa4c49e95 180 // Clear Acknowledge failure flag
phungductung 0:e87aa4c49e95 181 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
phungductung 0:e87aa4c49e95 182
phungductung 0:e87aa4c49e95 183 // Wait the STOP condition has been previously correctly sent
phungductung 0:e87aa4c49e95 184 timeout = FLAG_TIMEOUT;
phungductung 0:e87aa4c49e95 185 while ((i2c->CR2 & I2C_CR2_STOP) == I2C_CR2_STOP){
phungductung 0:e87aa4c49e95 186 if ((timeout--) == 0) {
phungductung 0:e87aa4c49e95 187 return 1;
phungductung 0:e87aa4c49e95 188 }
phungductung 0:e87aa4c49e95 189 }
phungductung 0:e87aa4c49e95 190
phungductung 0:e87aa4c49e95 191 // Generate the START condition
phungductung 0:e87aa4c49e95 192 i2c->CR2 |= I2C_CR2_START;
phungductung 0:e87aa4c49e95 193
phungductung 0:e87aa4c49e95 194 // Wait the START condition has been correctly sent
phungductung 0:e87aa4c49e95 195 timeout = FLAG_TIMEOUT;
phungductung 0:e87aa4c49e95 196 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
phungductung 0:e87aa4c49e95 197 if ((timeout--) == 0) {
phungductung 0:e87aa4c49e95 198 return 1;
phungductung 0:e87aa4c49e95 199 }
phungductung 0:e87aa4c49e95 200 }
phungductung 0:e87aa4c49e95 201
phungductung 0:e87aa4c49e95 202 return 0;
phungductung 0:e87aa4c49e95 203 }
phungductung 0:e87aa4c49e95 204
phungductung 0:e87aa4c49e95 205 inline int i2c_stop(i2c_t *obj)
phungductung 0:e87aa4c49e95 206 {
phungductung 0:e87aa4c49e95 207 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
phungductung 0:e87aa4c49e95 208
phungductung 0:e87aa4c49e95 209 // Generate the STOP condition
phungductung 0:e87aa4c49e95 210 i2c->CR2 |= I2C_CR2_STOP;
phungductung 0:e87aa4c49e95 211
phungductung 0:e87aa4c49e95 212 return 0;
phungductung 0:e87aa4c49e95 213 }
phungductung 0:e87aa4c49e95 214
phungductung 0:e87aa4c49e95 215 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
phungductung 0:e87aa4c49e95 216 {
phungductung 0:e87aa4c49e95 217 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
phungductung 0:e87aa4c49e95 218 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
phungductung 0:e87aa4c49e95 219 int timeout;
phungductung 0:e87aa4c49e95 220 int count;
phungductung 0:e87aa4c49e95 221 int value;
phungductung 0:e87aa4c49e95 222
phungductung 0:e87aa4c49e95 223 /* update CR2 register */
phungductung 0:e87aa4c49e95 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)))
phungductung 0:e87aa4c49e95 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);
phungductung 0:e87aa4c49e95 226
phungductung 0:e87aa4c49e95 227 // Read all bytes
phungductung 0:e87aa4c49e95 228 for (count = 0; count < length; count++) {
phungductung 0:e87aa4c49e95 229 value = i2c_byte_read(obj, 0);
phungductung 0:e87aa4c49e95 230 data[count] = (char)value;
phungductung 0:e87aa4c49e95 231 }
phungductung 0:e87aa4c49e95 232
phungductung 0:e87aa4c49e95 233 // Wait transfer complete
phungductung 0:e87aa4c49e95 234 timeout = LONG_TIMEOUT;
phungductung 0:e87aa4c49e95 235 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
phungductung 0:e87aa4c49e95 236 timeout--;
phungductung 0:e87aa4c49e95 237 if (timeout == 0) {
phungductung 0:e87aa4c49e95 238 return -1;
phungductung 0:e87aa4c49e95 239 }
phungductung 0:e87aa4c49e95 240 }
phungductung 0:e87aa4c49e95 241
phungductung 0:e87aa4c49e95 242 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
phungductung 0:e87aa4c49e95 243
phungductung 0:e87aa4c49e95 244 // If not repeated start, send stop.
phungductung 0:e87aa4c49e95 245 if (stop) {
phungductung 0:e87aa4c49e95 246 i2c_stop(obj);
phungductung 0:e87aa4c49e95 247 /* Wait until STOPF flag is set */
phungductung 0:e87aa4c49e95 248 timeout = FLAG_TIMEOUT;
phungductung 0:e87aa4c49e95 249 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
phungductung 0:e87aa4c49e95 250 timeout--;
phungductung 0:e87aa4c49e95 251 if (timeout == 0) {
phungductung 0:e87aa4c49e95 252 return -1;
phungductung 0:e87aa4c49e95 253 }
phungductung 0:e87aa4c49e95 254 }
phungductung 0:e87aa4c49e95 255 /* Clear STOP Flag */
phungductung 0:e87aa4c49e95 256 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
phungductung 0:e87aa4c49e95 257 }
phungductung 0:e87aa4c49e95 258
phungductung 0:e87aa4c49e95 259 return length;
phungductung 0:e87aa4c49e95 260 }
phungductung 0:e87aa4c49e95 261
phungductung 0:e87aa4c49e95 262 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
phungductung 0:e87aa4c49e95 263 {
phungductung 0:e87aa4c49e95 264 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
phungductung 0:e87aa4c49e95 265 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
phungductung 0:e87aa4c49e95 266 int timeout;
phungductung 0:e87aa4c49e95 267 int count;
phungductung 0:e87aa4c49e95 268
phungductung 0:e87aa4c49e95 269 /* update CR2 register */
phungductung 0:e87aa4c49e95 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)))
phungductung 0:e87aa4c49e95 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);
phungductung 0:e87aa4c49e95 272
phungductung 0:e87aa4c49e95 273 for (count = 0; count < length; count++) {
phungductung 0:e87aa4c49e95 274 i2c_byte_write(obj, data[count]);
phungductung 0:e87aa4c49e95 275 }
phungductung 0:e87aa4c49e95 276
phungductung 0:e87aa4c49e95 277 // Wait transfer complete
phungductung 0:e87aa4c49e95 278 timeout = FLAG_TIMEOUT;
phungductung 0:e87aa4c49e95 279 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
phungductung 0:e87aa4c49e95 280 timeout--;
phungductung 0:e87aa4c49e95 281 if (timeout == 0) {
phungductung 0:e87aa4c49e95 282 return -1;
phungductung 0:e87aa4c49e95 283 }
phungductung 0:e87aa4c49e95 284 }
phungductung 0:e87aa4c49e95 285
phungductung 0:e87aa4c49e95 286 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
phungductung 0:e87aa4c49e95 287
phungductung 0:e87aa4c49e95 288 // If not repeated start, send stop.
phungductung 0:e87aa4c49e95 289 if (stop) {
phungductung 0:e87aa4c49e95 290 i2c_stop(obj);
phungductung 0:e87aa4c49e95 291 /* Wait until STOPF flag is set */
phungductung 0:e87aa4c49e95 292 timeout = FLAG_TIMEOUT;
phungductung 0:e87aa4c49e95 293 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
phungductung 0:e87aa4c49e95 294 timeout--;
phungductung 0:e87aa4c49e95 295 if (timeout == 0) {
phungductung 0:e87aa4c49e95 296 return -1;
phungductung 0:e87aa4c49e95 297 }
phungductung 0:e87aa4c49e95 298 }
phungductung 0:e87aa4c49e95 299 /* Clear STOP Flag */
phungductung 0:e87aa4c49e95 300 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
phungductung 0:e87aa4c49e95 301 }
phungductung 0:e87aa4c49e95 302
phungductung 0:e87aa4c49e95 303 return count;
phungductung 0:e87aa4c49e95 304 }
phungductung 0:e87aa4c49e95 305
phungductung 0:e87aa4c49e95 306 int i2c_byte_read(i2c_t *obj, int last)
phungductung 0:e87aa4c49e95 307 {
phungductung 0:e87aa4c49e95 308 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
phungductung 0:e87aa4c49e95 309 int timeout;
phungductung 0:e87aa4c49e95 310
phungductung 0:e87aa4c49e95 311 // Wait until the byte is received
phungductung 0:e87aa4c49e95 312 timeout = FLAG_TIMEOUT;
phungductung 0:e87aa4c49e95 313 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
phungductung 0:e87aa4c49e95 314 if ((timeout--) == 0) {
phungductung 0:e87aa4c49e95 315 return -1;
phungductung 0:e87aa4c49e95 316 }
phungductung 0:e87aa4c49e95 317 }
phungductung 0:e87aa4c49e95 318
phungductung 0:e87aa4c49e95 319 return (int)i2c->RXDR;
phungductung 0:e87aa4c49e95 320 }
phungductung 0:e87aa4c49e95 321
phungductung 0:e87aa4c49e95 322 int i2c_byte_write(i2c_t *obj, int data)
phungductung 0:e87aa4c49e95 323 {
phungductung 0:e87aa4c49e95 324 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
phungductung 0:e87aa4c49e95 325 int timeout;
phungductung 0:e87aa4c49e95 326
phungductung 0:e87aa4c49e95 327 // Wait until the previous byte is transmitted
phungductung 0:e87aa4c49e95 328 timeout = FLAG_TIMEOUT;
phungductung 0:e87aa4c49e95 329 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
phungductung 0:e87aa4c49e95 330 if ((timeout--) == 0) {
phungductung 0:e87aa4c49e95 331 return 0;
phungductung 0:e87aa4c49e95 332 }
phungductung 0:e87aa4c49e95 333 }
phungductung 0:e87aa4c49e95 334
phungductung 0:e87aa4c49e95 335 i2c->TXDR = (uint8_t)data;
phungductung 0:e87aa4c49e95 336
phungductung 0:e87aa4c49e95 337 return 1;
phungductung 0:e87aa4c49e95 338 }
phungductung 0:e87aa4c49e95 339
phungductung 0:e87aa4c49e95 340 void i2c_reset(i2c_t *obj)
phungductung 0:e87aa4c49e95 341 {
phungductung 0:e87aa4c49e95 342 int timeout;
phungductung 0:e87aa4c49e95 343
phungductung 0:e87aa4c49e95 344 // wait before reset
phungductung 0:e87aa4c49e95 345 timeout = LONG_TIMEOUT;
phungductung 0:e87aa4c49e95 346 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
phungductung 0:e87aa4c49e95 347
phungductung 0:e87aa4c49e95 348 __I2C1_FORCE_RESET();
phungductung 0:e87aa4c49e95 349 __I2C1_RELEASE_RESET();
phungductung 0:e87aa4c49e95 350 }
phungductung 0:e87aa4c49e95 351
phungductung 0:e87aa4c49e95 352 #if DEVICE_I2CSLAVE
phungductung 0:e87aa4c49e95 353
phungductung 0:e87aa4c49e95 354 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
phungductung 0:e87aa4c49e95 355 {
phungductung 0:e87aa4c49e95 356 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
phungductung 0:e87aa4c49e95 357 uint16_t tmpreg;
phungductung 0:e87aa4c49e95 358
phungductung 0:e87aa4c49e95 359 // disable
phungductung 0:e87aa4c49e95 360 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
phungductung 0:e87aa4c49e95 361 // Get the old register value
phungductung 0:e87aa4c49e95 362 tmpreg = i2c->OAR1;
phungductung 0:e87aa4c49e95 363 // Reset address bits
phungductung 0:e87aa4c49e95 364 tmpreg &= 0xFC00;
phungductung 0:e87aa4c49e95 365 // Set new address
phungductung 0:e87aa4c49e95 366 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
phungductung 0:e87aa4c49e95 367 // Store the new register value
phungductung 0:e87aa4c49e95 368 i2c->OAR1 = tmpreg;
phungductung 0:e87aa4c49e95 369 // enable
phungductung 0:e87aa4c49e95 370 i2c->OAR1 |= I2C_OAR1_OA1EN;
phungductung 0:e87aa4c49e95 371 }
phungductung 0:e87aa4c49e95 372
phungductung 0:e87aa4c49e95 373 void i2c_slave_mode(i2c_t *obj, int enable_slave)
phungductung 0:e87aa4c49e95 374 {
phungductung 0:e87aa4c49e95 375
phungductung 0:e87aa4c49e95 376 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
phungductung 0:e87aa4c49e95 377 uint16_t tmpreg;
phungductung 0:e87aa4c49e95 378
phungductung 0:e87aa4c49e95 379 // Get the old register value
phungductung 0:e87aa4c49e95 380 tmpreg = i2c->OAR1;
phungductung 0:e87aa4c49e95 381
phungductung 0:e87aa4c49e95 382 // Enable / disable slave
phungductung 0:e87aa4c49e95 383 if (enable_slave == 1) {
phungductung 0:e87aa4c49e95 384 tmpreg |= I2C_OAR1_OA1EN;
phungductung 0:e87aa4c49e95 385 } else {
phungductung 0:e87aa4c49e95 386 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
phungductung 0:e87aa4c49e95 387 }
phungductung 0:e87aa4c49e95 388
phungductung 0:e87aa4c49e95 389 // Set new mode
phungductung 0:e87aa4c49e95 390 i2c->OAR1 = tmpreg;
phungductung 0:e87aa4c49e95 391
phungductung 0:e87aa4c49e95 392 }
phungductung 0:e87aa4c49e95 393
phungductung 0:e87aa4c49e95 394 // See I2CSlave.h
phungductung 0:e87aa4c49e95 395 #define NoData 0 // the slave has not been addressed
phungductung 0:e87aa4c49e95 396 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
phungductung 0:e87aa4c49e95 397 #define WriteGeneral 2 // the master is writing to all slave
phungductung 0:e87aa4c49e95 398 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
phungductung 0:e87aa4c49e95 399
phungductung 0:e87aa4c49e95 400 int i2c_slave_receive(i2c_t *obj)
phungductung 0:e87aa4c49e95 401 {
phungductung 0:e87aa4c49e95 402 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
phungductung 0:e87aa4c49e95 403 int retValue = NoData;
phungductung 0:e87aa4c49e95 404
phungductung 0:e87aa4c49e95 405 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
phungductung 0:e87aa4c49e95 406 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
phungductung 0:e87aa4c49e95 407 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
phungductung 0:e87aa4c49e95 408 retValue = ReadAddressed;
phungductung 0:e87aa4c49e95 409 else
phungductung 0:e87aa4c49e95 410 retValue = WriteAddressed;
phungductung 0:e87aa4c49e95 411 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
phungductung 0:e87aa4c49e95 412 }
phungductung 0:e87aa4c49e95 413 }
phungductung 0:e87aa4c49e95 414
phungductung 0:e87aa4c49e95 415 return (retValue);
phungductung 0:e87aa4c49e95 416 }
phungductung 0:e87aa4c49e95 417
phungductung 0:e87aa4c49e95 418 int i2c_slave_read(i2c_t *obj, char *data, int length)
phungductung 0:e87aa4c49e95 419 {
phungductung 0:e87aa4c49e95 420 char size = 0;
phungductung 0:e87aa4c49e95 421
phungductung 0:e87aa4c49e95 422 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
phungductung 0:e87aa4c49e95 423
phungductung 0:e87aa4c49e95 424 return size;
phungductung 0:e87aa4c49e95 425 }
phungductung 0:e87aa4c49e95 426
phungductung 0:e87aa4c49e95 427 int i2c_slave_write(i2c_t *obj, const char *data, int length)
phungductung 0:e87aa4c49e95 428 {
phungductung 0:e87aa4c49e95 429 char size = 0;
phungductung 0:e87aa4c49e95 430 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
phungductung 0:e87aa4c49e95 431
phungductung 0:e87aa4c49e95 432 do {
phungductung 0:e87aa4c49e95 433 i2c_byte_write(obj, data[size]);
phungductung 0:e87aa4c49e95 434 size++;
phungductung 0:e87aa4c49e95 435 } while (size < length);
phungductung 0:e87aa4c49e95 436
phungductung 0:e87aa4c49e95 437 return size;
phungductung 0:e87aa4c49e95 438 }
phungductung 0:e87aa4c49e95 439
phungductung 0:e87aa4c49e95 440
phungductung 0:e87aa4c49e95 441 #endif // DEVICE_I2CSLAVE
phungductung 0:e87aa4c49e95 442
phungductung 0:e87aa4c49e95 443 #endif // DEVICE_I2C