Fawwaz Nadzmy / mbed-STM

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32F0/i2c_api.c@153:9398a535854b, 2016-12-22 (annotated)

Committer:
fwndz
Date:
Thu Dec 22 05:12:40 2016 +0000
Revision:
153:9398a535854b
Parent:
149:156823d33999 
device target maximize

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 *******************************************************************************
<> 144:ef7eb2e8f9f7 3 * Copyright (c) 2014, STMicroelectronics
<> 144:ef7eb2e8f9f7 4 * All rights reserved.
<> 144:ef7eb2e8f9f7 5 *
<> 144:ef7eb2e8f9f7 6 * Redistribution and use in source and binary forms, with or without
<> 144:ef7eb2e8f9f7 7 * modification, are permitted provided that the following conditions are met:
<> 144:ef7eb2e8f9f7 8 *
<> 144:ef7eb2e8f9f7 9 * 1. Redistributions of source code must retain the above copyright notice,
<> 144:ef7eb2e8f9f7 10 * this list of conditions and the following disclaimer.
<> 144:ef7eb2e8f9f7 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 144:ef7eb2e8f9f7 12 * this list of conditions and the following disclaimer in the documentation
<> 144:ef7eb2e8f9f7 13 * and/or other materials provided with the distribution.
<> 144:ef7eb2e8f9f7 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 144:ef7eb2e8f9f7 15 * may be used to endorse or promote products derived from this software
<> 144:ef7eb2e8f9f7 16 * without specific prior written permission.
<> 144:ef7eb2e8f9f7 17 *
<> 144:ef7eb2e8f9f7 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 144:ef7eb2e8f9f7 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 144:ef7eb2e8f9f7 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 144:ef7eb2e8f9f7 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 144:ef7eb2e8f9f7 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 144:ef7eb2e8f9f7 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 144:ef7eb2e8f9f7 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 144:ef7eb2e8f9f7 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 144:ef7eb2e8f9f7 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 144:ef7eb2e8f9f7 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 144:ef7eb2e8f9f7 28 *******************************************************************************
<> 144:ef7eb2e8f9f7 29 */
<> 144:ef7eb2e8f9f7 30 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 31 #include "i2c_api.h"
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 #if DEVICE_I2C
<> 144:ef7eb2e8f9f7 34
<> 144:ef7eb2e8f9f7 35 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 36 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 37 #include "PeripheralPins.h"
<> 144:ef7eb2e8f9f7 38
<> 144:ef7eb2e8f9f7 39 /* Timeout values for flags and events waiting loops. These timeouts are
<> 144:ef7eb2e8f9f7 40 not based on accurate values, they just guarantee that the application will
<> 144:ef7eb2e8f9f7 41 not remain stuck if the I2C communication is corrupted. */
<> 144:ef7eb2e8f9f7 42 #define FLAG_TIMEOUT ((int)0x1000)
<> 144:ef7eb2e8f9f7 43 #define LONG_TIMEOUT ((int)0x8000)
<> 144:ef7eb2e8f9f7 44
<> 144:ef7eb2e8f9f7 45 I2C_HandleTypeDef I2cHandle;
<> 144:ef7eb2e8f9f7 46
<> 144:ef7eb2e8f9f7 47 int i2c1_inited = 0;
<> 144:ef7eb2e8f9f7 48 #if defined(I2C2_BASE)
<> 144:ef7eb2e8f9f7 49 int i2c2_inited = 0;
<> 144:ef7eb2e8f9f7 50 #endif
<> 144:ef7eb2e8f9f7 51
<> 144:ef7eb2e8f9f7 52 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
<> 144:ef7eb2e8f9f7 53 // Determine the I2C to use
<> 144:ef7eb2e8f9f7 54 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
<> 144:ef7eb2e8f9f7 55 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
<> 144:ef7eb2e8f9f7 56
<> 144:ef7eb2e8f9f7 57 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
<> 144:ef7eb2e8f9f7 58 MBED_ASSERT(obj->i2c != (I2CName)NC);
<> 144:ef7eb2e8f9f7 59
<> 144:ef7eb2e8f9f7 60 // Enable I2C1 clock and pinout if not done
<> 144:ef7eb2e8f9f7 61 if ((obj->i2c == I2C_1) && !i2c1_inited) {
<> 144:ef7eb2e8f9f7 62 i2c1_inited = 1;
<> 144:ef7eb2e8f9f7 63 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
<> 144:ef7eb2e8f9f7 64 __I2C1_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 65 // Configure I2C pins
<> 144:ef7eb2e8f9f7 66 pinmap_pinout(sda, PinMap_I2C_SDA);
<> 144:ef7eb2e8f9f7 67 pinmap_pinout(scl, PinMap_I2C_SCL);
<> 144:ef7eb2e8f9f7 68 pin_mode(sda, OpenDrain);
<> 144:ef7eb2e8f9f7 69 pin_mode(scl, OpenDrain);
<> 144:ef7eb2e8f9f7 70 }
<> 144:ef7eb2e8f9f7 71
<> 144:ef7eb2e8f9f7 72 #if defined(I2C2_BASE)
<> 144:ef7eb2e8f9f7 73 // Enable I2C2 clock and pinout if not done
<> 144:ef7eb2e8f9f7 74 if ((obj->i2c == I2C_2) && !i2c2_inited) {
<> 144:ef7eb2e8f9f7 75 i2c2_inited = 1;
<> 144:ef7eb2e8f9f7 76 __I2C2_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 77 // Configure I2C pins
<> 144:ef7eb2e8f9f7 78 pinmap_pinout(sda, PinMap_I2C_SDA);
<> 144:ef7eb2e8f9f7 79 pinmap_pinout(scl, PinMap_I2C_SCL);
<> 144:ef7eb2e8f9f7 80 pin_mode(sda, OpenDrain);
<> 144:ef7eb2e8f9f7 81 pin_mode(scl, OpenDrain);
<> 144:ef7eb2e8f9f7 82 }
<> 144:ef7eb2e8f9f7 83 #endif
<> 144:ef7eb2e8f9f7 84
<> 144:ef7eb2e8f9f7 85 // Reset to clear pending flags if any
<> 144:ef7eb2e8f9f7 86 i2c_reset(obj);
<> 144:ef7eb2e8f9f7 87
<> 144:ef7eb2e8f9f7 88 // I2C configuration
<> 144:ef7eb2e8f9f7 89 i2c_frequency(obj, 100000); // 100 kHz per default
<> 144:ef7eb2e8f9f7 90 }
<> 144:ef7eb2e8f9f7 91
<> 144:ef7eb2e8f9f7 92 void i2c_frequency(i2c_t *obj, int hz) {
<> 144:ef7eb2e8f9f7 93 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
<> 144:ef7eb2e8f9f7 94 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 95 int timeout;
<> 144:ef7eb2e8f9f7 96
<> 144:ef7eb2e8f9f7 97 // wait before init
<> 144:ef7eb2e8f9f7 98 timeout = LONG_TIMEOUT;
<> 144:ef7eb2e8f9f7 99 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
<> 144:ef7eb2e8f9f7 100
<> 144:ef7eb2e8f9f7 101 // Common settings: I2C clock = 48 MHz, Analog filter = ON, Digital filter coefficient = 0
<> 144:ef7eb2e8f9f7 102 switch (hz) {
<> 144:ef7eb2e8f9f7 103 case 100000:
<> 144:ef7eb2e8f9f7 104 I2cHandle.Init.Timing = 0x10805E89; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
<> 144:ef7eb2e8f9f7 105 break;
<> 144:ef7eb2e8f9f7 106 case 400000:
<> 144:ef7eb2e8f9f7 107 I2cHandle.Init.Timing = 0x00901850; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
<> 144:ef7eb2e8f9f7 108 break;
<> 144:ef7eb2e8f9f7 109 case 1000000:
<> 144:ef7eb2e8f9f7 110 I2cHandle.Init.Timing = 0x00700818; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
<> 144:ef7eb2e8f9f7 111 break;
<> 144:ef7eb2e8f9f7 112 default:
<> 144:ef7eb2e8f9f7 113 break;
<> 144:ef7eb2e8f9f7 114 }
<> 144:ef7eb2e8f9f7 115
<> 144:ef7eb2e8f9f7 116 // I2C configuration
<> 144:ef7eb2e8f9f7 117 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
<> 144:ef7eb2e8f9f7 118 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
<> 144:ef7eb2e8f9f7 119 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
<> 144:ef7eb2e8f9f7 120 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
<> 144:ef7eb2e8f9f7 121 I2cHandle.Init.OwnAddress1 = 0;
<> 144:ef7eb2e8f9f7 122 I2cHandle.Init.OwnAddress2 = 0;
<> 144:ef7eb2e8f9f7 123 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
<> 144:ef7eb2e8f9f7 124 HAL_I2C_Init(&I2cHandle);
<> 144:ef7eb2e8f9f7 125 }
<> 144:ef7eb2e8f9f7 126
<> 144:ef7eb2e8f9f7 127 inline int i2c_start(i2c_t *obj) {
<> 144:ef7eb2e8f9f7 128 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 129 int timeout;
<> 144:ef7eb2e8f9f7 130
<> 144:ef7eb2e8f9f7 131 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 132
<> 144:ef7eb2e8f9f7 133 // Clear Acknowledge failure flag
<> 144:ef7eb2e8f9f7 134 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
<> 144:ef7eb2e8f9f7 135
<> 144:ef7eb2e8f9f7 136 // Wait the STOP condition has been previously correctly sent
<> 144:ef7eb2e8f9f7 137 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 138 while ((i2c->CR2 & I2C_CR2_STOP) == I2C_CR2_STOP){
<> 144:ef7eb2e8f9f7 139 if ((timeout--) == 0) {
<> 144:ef7eb2e8f9f7 140 return 1;
<> 144:ef7eb2e8f9f7 141 }
<> 144:ef7eb2e8f9f7 142 }
<> 144:ef7eb2e8f9f7 143
<> 144:ef7eb2e8f9f7 144 // Generate the START condition
<> 144:ef7eb2e8f9f7 145 i2c->CR2 |= I2C_CR2_START;
<> 144:ef7eb2e8f9f7 146
<> 144:ef7eb2e8f9f7 147 // Wait the START condition has been correctly sent
<> 144:ef7eb2e8f9f7 148 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 149 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
<> 144:ef7eb2e8f9f7 150 if ((timeout--) == 0) {
<> 144:ef7eb2e8f9f7 151 return 1;
<> 144:ef7eb2e8f9f7 152 }
<> 144:ef7eb2e8f9f7 153 }
<> 144:ef7eb2e8f9f7 154
<> 144:ef7eb2e8f9f7 155 return 0;
<> 144:ef7eb2e8f9f7 156 }
<> 144:ef7eb2e8f9f7 157
<> 144:ef7eb2e8f9f7 158 inline int i2c_stop(i2c_t *obj) {
<> 144:ef7eb2e8f9f7 159 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 160
<> 144:ef7eb2e8f9f7 161 // Generate the STOP condition
<> 144:ef7eb2e8f9f7 162 i2c->CR2 |= I2C_CR2_STOP;
<> 144:ef7eb2e8f9f7 163
<> 144:ef7eb2e8f9f7 164 return 0;
<> 144:ef7eb2e8f9f7 165 }
<> 144:ef7eb2e8f9f7 166
<> 144:ef7eb2e8f9f7 167 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
<> 144:ef7eb2e8f9f7 168 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 169 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 170 int timeout;
<> 144:ef7eb2e8f9f7 171 int count;
<> 144:ef7eb2e8f9f7 172 int value;
<> 144:ef7eb2e8f9f7 173
<> 144:ef7eb2e8f9f7 174 // Update CR2 register
<> 144:ef7eb2e8f9f7 175 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)))
<> 144:ef7eb2e8f9f7 176 | (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);
<> 144:ef7eb2e8f9f7 177
<> 144:ef7eb2e8f9f7 178 // Read all bytes
<> 144:ef7eb2e8f9f7 179 for (count = 0; count < length; count++) {
<> 144:ef7eb2e8f9f7 180 value = i2c_byte_read(obj, 0);
<> 144:ef7eb2e8f9f7 181 data[count] = (char)value;
<> 144:ef7eb2e8f9f7 182 }
<> 144:ef7eb2e8f9f7 183
<> 144:ef7eb2e8f9f7 184 // Wait transfer complete
<> 144:ef7eb2e8f9f7 185 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 186 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
<> 144:ef7eb2e8f9f7 187 timeout--;
<> 144:ef7eb2e8f9f7 188 if (timeout == 0) {
<> 144:ef7eb2e8f9f7 189 return -1;
<> 144:ef7eb2e8f9f7 190 }
<> 144:ef7eb2e8f9f7 191 }
<> 144:ef7eb2e8f9f7 192 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
<> 144:ef7eb2e8f9f7 193
<> 144:ef7eb2e8f9f7 194 // If not repeated start, send stop.
<> 144:ef7eb2e8f9f7 195 if (stop) {
<> 144:ef7eb2e8f9f7 196 i2c_stop(obj);
<> 144:ef7eb2e8f9f7 197 // Wait until STOPF flag is set
<> 144:ef7eb2e8f9f7 198 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 199 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
<> 144:ef7eb2e8f9f7 200 timeout--;
<> 144:ef7eb2e8f9f7 201 if (timeout == 0) {
<> 144:ef7eb2e8f9f7 202 return -1;
<> 144:ef7eb2e8f9f7 203 }
<> 144:ef7eb2e8f9f7 204 }
<> 144:ef7eb2e8f9f7 205 // Clear STOP Flag
<> 144:ef7eb2e8f9f7 206 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
<> 144:ef7eb2e8f9f7 207 }
<> 144:ef7eb2e8f9f7 208
<> 144:ef7eb2e8f9f7 209 return length;
<> 144:ef7eb2e8f9f7 210 }
<> 144:ef7eb2e8f9f7 211
<> 144:ef7eb2e8f9f7 212 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
<> 144:ef7eb2e8f9f7 213 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 214 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 215 int timeout;
<> 144:ef7eb2e8f9f7 216 int count;
<> 144:ef7eb2e8f9f7 217
<> 144:ef7eb2e8f9f7 218 // Update CR2 register
<> 144:ef7eb2e8f9f7 219 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)))
<> 144:ef7eb2e8f9f7 220 | (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);
<> 144:ef7eb2e8f9f7 221
<> 144:ef7eb2e8f9f7 222 for (count = 0; count < length; count++) {
<> 144:ef7eb2e8f9f7 223 i2c_byte_write(obj, data[count]);
<> 144:ef7eb2e8f9f7 224 }
<> 144:ef7eb2e8f9f7 225
<> 144:ef7eb2e8f9f7 226 // Wait transfer complete
<> 144:ef7eb2e8f9f7 227 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 228 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
<> 144:ef7eb2e8f9f7 229 timeout--;
<> 144:ef7eb2e8f9f7 230 if (timeout == 0) {
<> 144:ef7eb2e8f9f7 231 return -1;
<> 144:ef7eb2e8f9f7 232 }
<> 144:ef7eb2e8f9f7 233 }
<> 144:ef7eb2e8f9f7 234 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
<> 144:ef7eb2e8f9f7 235
<> 144:ef7eb2e8f9f7 236 // If not repeated start, send stop
<> 144:ef7eb2e8f9f7 237 if (stop) {
<> 144:ef7eb2e8f9f7 238 i2c_stop(obj);
<> 144:ef7eb2e8f9f7 239 // Wait until STOPF flag is set
<> 144:ef7eb2e8f9f7 240 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 241 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
<> 144:ef7eb2e8f9f7 242 timeout--;
<> 144:ef7eb2e8f9f7 243 if (timeout == 0) {
<> 144:ef7eb2e8f9f7 244 return -1;
<> 144:ef7eb2e8f9f7 245 }
<> 144:ef7eb2e8f9f7 246 }
<> 144:ef7eb2e8f9f7 247 // Clear STOP Flag
<> 144:ef7eb2e8f9f7 248 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
<> 144:ef7eb2e8f9f7 249 }
<> 144:ef7eb2e8f9f7 250
<> 144:ef7eb2e8f9f7 251 return count;
<> 144:ef7eb2e8f9f7 252 }
<> 144:ef7eb2e8f9f7 253
<> 144:ef7eb2e8f9f7 254 int i2c_byte_read(i2c_t *obj, int last) {
<> 144:ef7eb2e8f9f7 255 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 256 int timeout;
<> 144:ef7eb2e8f9f7 257
<> 144:ef7eb2e8f9f7 258 // Wait until the byte is received
<> 144:ef7eb2e8f9f7 259 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 260 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
<> 144:ef7eb2e8f9f7 261 if ((timeout--) == 0) {
<> 144:ef7eb2e8f9f7 262 return -1;
<> 144:ef7eb2e8f9f7 263 }
<> 144:ef7eb2e8f9f7 264 }
<> 144:ef7eb2e8f9f7 265
<> 144:ef7eb2e8f9f7 266 return (int)i2c->RXDR;
<> 144:ef7eb2e8f9f7 267 }
<> 144:ef7eb2e8f9f7 268
<> 144:ef7eb2e8f9f7 269 int i2c_byte_write(i2c_t *obj, int data) {
<> 144:ef7eb2e8f9f7 270 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 271 int timeout;
<> 144:ef7eb2e8f9f7 272
<> 144:ef7eb2e8f9f7 273 // Wait until the previous byte is transmitted
<> 144:ef7eb2e8f9f7 274 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 275 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
<> 144:ef7eb2e8f9f7 276 if ((timeout--) == 0) {
<> 144:ef7eb2e8f9f7 277 return 0;
<> 144:ef7eb2e8f9f7 278 }
<> 144:ef7eb2e8f9f7 279 }
<> 144:ef7eb2e8f9f7 280
<> 144:ef7eb2e8f9f7 281 i2c->TXDR = (uint8_t)data;
<> 144:ef7eb2e8f9f7 282
<> 144:ef7eb2e8f9f7 283 return 1;
<> 144:ef7eb2e8f9f7 284 }
<> 144:ef7eb2e8f9f7 285
<> 144:ef7eb2e8f9f7 286 void i2c_reset(i2c_t *obj) {
<> 144:ef7eb2e8f9f7 287 int timeout;
<> 144:ef7eb2e8f9f7 288
<> 144:ef7eb2e8f9f7 289 // Wait before reset
<> 144:ef7eb2e8f9f7 290 timeout = LONG_TIMEOUT;
<> 144:ef7eb2e8f9f7 291 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
<> 144:ef7eb2e8f9f7 292
<> 144:ef7eb2e8f9f7 293 if (obj->i2c == I2C_1) {
<> 144:ef7eb2e8f9f7 294 __I2C1_FORCE_RESET();
<> 144:ef7eb2e8f9f7 295 __I2C1_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 296 }
<> 144:ef7eb2e8f9f7 297 #if defined(I2C2_BASE)
<> 144:ef7eb2e8f9f7 298 if (obj->i2c == I2C_2) {
<> 144:ef7eb2e8f9f7 299 __I2C2_FORCE_RESET();
<> 144:ef7eb2e8f9f7 300 __I2C2_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 301 }
<> 144:ef7eb2e8f9f7 302 #endif
<> 144:ef7eb2e8f9f7 303 }
<> 144:ef7eb2e8f9f7 304
<> 144:ef7eb2e8f9f7 305 #if DEVICE_I2CSLAVE
<> 144:ef7eb2e8f9f7 306
<> 144:ef7eb2e8f9f7 307 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
<> 144:ef7eb2e8f9f7 308 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 309 uint16_t tmpreg = 0;
<> 144:ef7eb2e8f9f7 310
<> 144:ef7eb2e8f9f7 311 // disable
<> 144:ef7eb2e8f9f7 312 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
<> 144:ef7eb2e8f9f7 313 // Get the old register value
<> 144:ef7eb2e8f9f7 314 tmpreg = i2c->OAR1;
<> 144:ef7eb2e8f9f7 315 // Reset address bits
<> 144:ef7eb2e8f9f7 316 tmpreg &= 0xFC00;
<> 144:ef7eb2e8f9f7 317 // Set new address
<> 144:ef7eb2e8f9f7 318 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
<> 144:ef7eb2e8f9f7 319 // Store the new register value
<> 144:ef7eb2e8f9f7 320 i2c->OAR1 = tmpreg;
<> 144:ef7eb2e8f9f7 321 // enable
<> 144:ef7eb2e8f9f7 322 i2c->OAR1 |= I2C_OAR1_OA1EN;
<> 144:ef7eb2e8f9f7 323 }
<> 144:ef7eb2e8f9f7 324
<> 144:ef7eb2e8f9f7 325 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
<> 144:ef7eb2e8f9f7 326 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 327 uint16_t tmpreg;
<> 144:ef7eb2e8f9f7 328
<> 144:ef7eb2e8f9f7 329 // Get the old register value
<> 144:ef7eb2e8f9f7 330 tmpreg = i2c->OAR1;
<> 144:ef7eb2e8f9f7 331
<> 144:ef7eb2e8f9f7 332 // Enable / disable slave
<> 144:ef7eb2e8f9f7 333 if (enable_slave == 1) {
<> 144:ef7eb2e8f9f7 334 tmpreg |= I2C_OAR1_OA1EN;
<> 144:ef7eb2e8f9f7 335 } else {
<> 144:ef7eb2e8f9f7 336 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
<> 144:ef7eb2e8f9f7 337 }
<> 144:ef7eb2e8f9f7 338
<> 144:ef7eb2e8f9f7 339 // Set new mode
<> 144:ef7eb2e8f9f7 340 i2c->OAR1 = tmpreg;
<> 144:ef7eb2e8f9f7 341 }
<> 144:ef7eb2e8f9f7 342
<> 144:ef7eb2e8f9f7 343 // See I2CSlave.h
<> 144:ef7eb2e8f9f7 344 #define NoData 0 // the slave has not been addressed
<> 144:ef7eb2e8f9f7 345 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
<> 144:ef7eb2e8f9f7 346 #define WriteGeneral 2 // the master is writing to all slave
<> 144:ef7eb2e8f9f7 347 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
<> 144:ef7eb2e8f9f7 348
<> 144:ef7eb2e8f9f7 349 int i2c_slave_receive(i2c_t *obj) {
<> 144:ef7eb2e8f9f7 350 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 351 int retValue = NoData;
<> 144:ef7eb2e8f9f7 352
<> 144:ef7eb2e8f9f7 353 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
<> 144:ef7eb2e8f9f7 354 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
<> 144:ef7eb2e8f9f7 355 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
<> 144:ef7eb2e8f9f7 356 retValue = ReadAddressed;
<> 144:ef7eb2e8f9f7 357 else
<> 144:ef7eb2e8f9f7 358 retValue = WriteAddressed;
<> 144:ef7eb2e8f9f7 359
<> 144:ef7eb2e8f9f7 360 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
<> 144:ef7eb2e8f9f7 361 }
<> 144:ef7eb2e8f9f7 362 }
<> 144:ef7eb2e8f9f7 363
<> 144:ef7eb2e8f9f7 364 return (retValue);
<> 144:ef7eb2e8f9f7 365 }
<> 144:ef7eb2e8f9f7 366
<> 144:ef7eb2e8f9f7 367 int i2c_slave_read(i2c_t *obj, char *data, int length) {
<> 144:ef7eb2e8f9f7 368 char size = 0;
<> 144:ef7eb2e8f9f7 369
<> 144:ef7eb2e8f9f7 370 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
<> 144:ef7eb2e8f9f7 371
<> 144:ef7eb2e8f9f7 372 return size;
<> 144:ef7eb2e8f9f7 373 }
<> 144:ef7eb2e8f9f7 374
<> 144:ef7eb2e8f9f7 375 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
<> 144:ef7eb2e8f9f7 376 char size = 0;
<> 144:ef7eb2e8f9f7 377 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 378
<> 144:ef7eb2e8f9f7 379 do {
<> 144:ef7eb2e8f9f7 380 i2c_byte_write(obj, data[size]);
<> 144:ef7eb2e8f9f7 381 size++;
<> 144:ef7eb2e8f9f7 382 } while (size < length);
<> 144:ef7eb2e8f9f7 383
<> 144:ef7eb2e8f9f7 384 return size;
<> 144:ef7eb2e8f9f7 385 }
<> 144:ef7eb2e8f9f7 386
<> 144:ef7eb2e8f9f7 387
<> 144:ef7eb2e8f9f7 388 #endif // DEVICE_I2CSLAVE
<> 144:ef7eb2e8f9f7 389
<> 144:ef7eb2e8f9f7 390 #endif // DEVICE_I2C