Johannes Stratmann / mbed-dev

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targets/hal/TARGET_STM/TARGET_STM32F0/i2c_api.c@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

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