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targets/hal/TARGET_STM/TARGET_STM32F0/i2c_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
34:bb6061527455
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 *******************************************************************************
bogdanm 0:9b334a45a8ff 3 * Copyright (c) 2014, STMicroelectronics
bogdanm 0:9b334a45a8ff 4 * All rights reserved.
bogdanm 0:9b334a45a8ff 5 *
bogdanm 0:9b334a45a8ff 6 * Redistribution and use in source and binary forms, with or without
bogdanm 0:9b334a45a8ff 7 * modification, are permitted provided that the following conditions are met:
bogdanm 0:9b334a45a8ff 8 *
bogdanm 0:9b334a45a8ff 9 * 1. Redistributions of source code must retain the above copyright notice,
bogdanm 0:9b334a45a8ff 10 * this list of conditions and the following disclaimer.
bogdanm 0:9b334a45a8ff 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
bogdanm 0:9b334a45a8ff 12 * this list of conditions and the following disclaimer in the documentation
bogdanm 0:9b334a45a8ff 13 * and/or other materials provided with the distribution.
bogdanm 0:9b334a45a8ff 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
bogdanm 0:9b334a45a8ff 15 * may be used to endorse or promote products derived from this software
bogdanm 0:9b334a45a8ff 16 * without specific prior written permission.
bogdanm 0:9b334a45a8ff 17 *
bogdanm 0:9b334a45a8ff 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
bogdanm 0:9b334a45a8ff 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
bogdanm 0:9b334a45a8ff 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
bogdanm 0:9b334a45a8ff 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
bogdanm 0:9b334a45a8ff 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
bogdanm 0:9b334a45a8ff 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
bogdanm 0:9b334a45a8ff 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
bogdanm 0:9b334a45a8ff 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
bogdanm 0:9b334a45a8ff 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
bogdanm 0:9b334a45a8ff 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
bogdanm 0:9b334a45a8ff 28 *******************************************************************************
bogdanm 0:9b334a45a8ff 29 */
bogdanm 0:9b334a45a8ff 30 #include "mbed_assert.h"
bogdanm 0:9b334a45a8ff 31 #include "i2c_api.h"
bogdanm 0:9b334a45a8ff 32
bogdanm 0:9b334a45a8ff 33 #if DEVICE_I2C
bogdanm 0:9b334a45a8ff 34
bogdanm 0:9b334a45a8ff 35 #include "cmsis.h"
bogdanm 0:9b334a45a8ff 36 #include "pinmap.h"
bogdanm 0:9b334a45a8ff 37 #include "PeripheralPins.h"
bogdanm 0:9b334a45a8ff 38
bogdanm 0:9b334a45a8ff 39 /* Timeout values for flags and events waiting loops. These timeouts are
bogdanm 0:9b334a45a8ff 40 not based on accurate values, they just guarantee that the application will
bogdanm 0:9b334a45a8ff 41 not remain stuck if the I2C communication is corrupted. */
bogdanm 0:9b334a45a8ff 42 #define FLAG_TIMEOUT ((int)0x1000)
bogdanm 0:9b334a45a8ff 43 #define LONG_TIMEOUT ((int)0x8000)
bogdanm 0:9b334a45a8ff 44
bogdanm 0:9b334a45a8ff 45 I2C_HandleTypeDef I2cHandle;
bogdanm 0:9b334a45a8ff 46
bogdanm 0:9b334a45a8ff 47 int i2c1_inited = 0;
bogdanm 0:9b334a45a8ff 48 #if defined(I2C2_BASE)
bogdanm 0:9b334a45a8ff 49 int i2c2_inited = 0;
bogdanm 0:9b334a45a8ff 50 #endif
bogdanm 0:9b334a45a8ff 51
bogdanm 0:9b334a45a8ff 52 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
bogdanm 0:9b334a45a8ff 53 // Determine the I2C to use
bogdanm 0:9b334a45a8ff 54 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 55 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 56
bogdanm 0:9b334a45a8ff 57 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
bogdanm 0:9b334a45a8ff 58 MBED_ASSERT(obj->i2c != (I2CName)NC);
bogdanm 0:9b334a45a8ff 59
bogdanm 0:9b334a45a8ff 60 // Enable I2C1 clock and pinout if not done
bogdanm 0:9b334a45a8ff 61 if ((obj->i2c == I2C_1) && !i2c1_inited) {
bogdanm 0:9b334a45a8ff 62 i2c1_inited = 1;
bogdanm 0:9b334a45a8ff 63 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
bogdanm 0:9b334a45a8ff 64 __I2C1_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 65 // Configure I2C pins
bogdanm 0:9b334a45a8ff 66 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 67 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 68 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 69 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 70 }
bogdanm 0:9b334a45a8ff 71
bogdanm 0:9b334a45a8ff 72 #if defined(I2C2_BASE)
bogdanm 0:9b334a45a8ff 73 // Enable I2C2 clock and pinout if not done
bogdanm 0:9b334a45a8ff 74 if ((obj->i2c == I2C_2) && !i2c2_inited) {
bogdanm 0:9b334a45a8ff 75 i2c2_inited = 1;
bogdanm 0:9b334a45a8ff 76 __I2C2_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 77 // Configure I2C pins
bogdanm 0:9b334a45a8ff 78 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 79 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 80 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 81 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 82 }
bogdanm 0:9b334a45a8ff 83 #endif
bogdanm 0:9b334a45a8ff 84
bogdanm 0:9b334a45a8ff 85 // Reset to clear pending flags if any
bogdanm 0:9b334a45a8ff 86 i2c_reset(obj);
bogdanm 0:9b334a45a8ff 87
bogdanm 0:9b334a45a8ff 88 // I2C configuration
bogdanm 0:9b334a45a8ff 89 i2c_frequency(obj, 100000); // 100 kHz per default
bogdanm 0:9b334a45a8ff 90 }
bogdanm 0:9b334a45a8ff 91
bogdanm 0:9b334a45a8ff 92 void i2c_frequency(i2c_t *obj, int hz) {
bogdanm 0:9b334a45a8ff 93 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
bogdanm 0:9b334a45a8ff 94 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 95 int timeout;
bogdanm 0:9b334a45a8ff 96
bogdanm 0:9b334a45a8ff 97 // wait before init
bogdanm 0:9b334a45a8ff 98 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 99 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
bogdanm 0:9b334a45a8ff 100
bogdanm 0:9b334a45a8ff 101 // Common settings: I2C clock = 48 MHz, Analog filter = ON, Digital filter coefficient = 0
bogdanm 0:9b334a45a8ff 102 switch (hz) {
bogdanm 0:9b334a45a8ff 103 case 100000:
bogdanm 0:9b334a45a8ff 104 I2cHandle.Init.Timing = 0x10805E89; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
bogdanm 0:9b334a45a8ff 105 break;
bogdanm 0:9b334a45a8ff 106 case 400000:
bogdanm 0:9b334a45a8ff 107 I2cHandle.Init.Timing = 0x00901850; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
bogdanm 0:9b334a45a8ff 108 break;
bogdanm 0:9b334a45a8ff 109 case 1000000:
bogdanm 0:9b334a45a8ff 110 I2cHandle.Init.Timing = 0x00700818; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
bogdanm 0:9b334a45a8ff 111 break;
bogdanm 0:9b334a45a8ff 112 default:
bogdanm 0:9b334a45a8ff 113 break;
bogdanm 0:9b334a45a8ff 114 }
bogdanm 0:9b334a45a8ff 115
bogdanm 0:9b334a45a8ff 116 // I2C configuration
bogdanm 0:9b334a45a8ff 117 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
bogdanm 0:9b334a45a8ff 118 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
bogdanm 0:9b334a45a8ff 119 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
bogdanm 0:9b334a45a8ff 120 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
bogdanm 0:9b334a45a8ff 121 I2cHandle.Init.OwnAddress1 = 0;
bogdanm 0:9b334a45a8ff 122 I2cHandle.Init.OwnAddress2 = 0;
bogdanm 0:9b334a45a8ff 123 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
bogdanm 0:9b334a45a8ff 124 HAL_I2C_Init(&I2cHandle);
bogdanm 0:9b334a45a8ff 125 }
bogdanm 0:9b334a45a8ff 126
bogdanm 0:9b334a45a8ff 127 inline int i2c_start(i2c_t *obj) {
bogdanm 0:9b334a45a8ff 128 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 129 int timeout;
bogdanm 0:9b334a45a8ff 130
bogdanm 0:9b334a45a8ff 131 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 132
bogdanm 0:9b334a45a8ff 133 // Clear Acknowledge failure flag
bogdanm 0:9b334a45a8ff 134 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
bogdanm 0:9b334a45a8ff 135
bogdanm 0:9b334a45a8ff 136 // Generate the START condition
bogdanm 0:9b334a45a8ff 137 i2c->CR2 |= I2C_CR2_START;
bogdanm 0:9b334a45a8ff 138
bogdanm 0:9b334a45a8ff 139 // Wait the START condition has been correctly sent
bogdanm 0:9b334a45a8ff 140 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 141 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
bogdanm 0:9b334a45a8ff 142 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 143 return 1;
bogdanm 0:9b334a45a8ff 144 }
bogdanm 0:9b334a45a8ff 145 }
bogdanm 0:9b334a45a8ff 146
bogdanm 0:9b334a45a8ff 147 return 0;
bogdanm 0:9b334a45a8ff 148 }
bogdanm 0:9b334a45a8ff 149
bogdanm 0:9b334a45a8ff 150 inline int i2c_stop(i2c_t *obj) {
bogdanm 0:9b334a45a8ff 151 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 152
bogdanm 0:9b334a45a8ff 153 // Generate the STOP condition
bogdanm 0:9b334a45a8ff 154 i2c->CR2 |= I2C_CR2_STOP;
bogdanm 0:9b334a45a8ff 155
bogdanm 0:9b334a45a8ff 156 return 0;
bogdanm 0:9b334a45a8ff 157 }
bogdanm 0:9b334a45a8ff 158
bogdanm 0:9b334a45a8ff 159 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
bogdanm 0:9b334a45a8ff 160 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 161 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 162 int timeout;
bogdanm 0:9b334a45a8ff 163 int count;
bogdanm 0:9b334a45a8ff 164 int value;
bogdanm 0:9b334a45a8ff 165
bogdanm 0:9b334a45a8ff 166 // Update CR2 register
bogdanm 0:9b334a45a8ff 167 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)))
bogdanm 0:9b334a45a8ff 168 | (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);
bogdanm 0:9b334a45a8ff 169
bogdanm 0:9b334a45a8ff 170 // Read all bytes
bogdanm 0:9b334a45a8ff 171 for (count = 0; count < length; count++) {
bogdanm 0:9b334a45a8ff 172 value = i2c_byte_read(obj, 0);
bogdanm 0:9b334a45a8ff 173 data[count] = (char)value;
bogdanm 0:9b334a45a8ff 174 }
bogdanm 0:9b334a45a8ff 175
bogdanm 0:9b334a45a8ff 176 // Wait transfer complete
bogdanm 0:9b334a45a8ff 177 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 178 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
bogdanm 0:9b334a45a8ff 179 timeout--;
bogdanm 0:9b334a45a8ff 180 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 181 return -1;
bogdanm 0:9b334a45a8ff 182 }
bogdanm 0:9b334a45a8ff 183 }
bogdanm 0:9b334a45a8ff 184 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
bogdanm 0:9b334a45a8ff 185
bogdanm 0:9b334a45a8ff 186 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 187 if (stop) {
bogdanm 0:9b334a45a8ff 188 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 189 // Wait until STOPF flag is set
bogdanm 0:9b334a45a8ff 190 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 191 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
bogdanm 0:9b334a45a8ff 192 timeout--;
bogdanm 0:9b334a45a8ff 193 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 194 return -1;
bogdanm 0:9b334a45a8ff 195 }
bogdanm 0:9b334a45a8ff 196 }
bogdanm 0:9b334a45a8ff 197 // Clear STOP Flag
bogdanm 0:9b334a45a8ff 198 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
bogdanm 0:9b334a45a8ff 199 }
bogdanm 0:9b334a45a8ff 200
bogdanm 0:9b334a45a8ff 201 return length;
bogdanm 0:9b334a45a8ff 202 }
bogdanm 0:9b334a45a8ff 203
bogdanm 0:9b334a45a8ff 204 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
bogdanm 0:9b334a45a8ff 205 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 206 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 207 int timeout;
bogdanm 0:9b334a45a8ff 208 int count;
bogdanm 0:9b334a45a8ff 209
bogdanm 0:9b334a45a8ff 210 // Update CR2 register
bogdanm 0:9b334a45a8ff 211 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)))
bogdanm 0:9b334a45a8ff 212 | (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);
bogdanm 0:9b334a45a8ff 213
bogdanm 0:9b334a45a8ff 214 for (count = 0; count < length; count++) {
bogdanm 0:9b334a45a8ff 215 i2c_byte_write(obj, data[count]);
bogdanm 0:9b334a45a8ff 216 }
bogdanm 0:9b334a45a8ff 217
bogdanm 0:9b334a45a8ff 218 // Wait transfer complete
bogdanm 0:9b334a45a8ff 219 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 220 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
bogdanm 0:9b334a45a8ff 221 timeout--;
bogdanm 0:9b334a45a8ff 222 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 223 return -1;
bogdanm 0:9b334a45a8ff 224 }
bogdanm 0:9b334a45a8ff 225 }
bogdanm 0:9b334a45a8ff 226 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
bogdanm 0:9b334a45a8ff 227
bogdanm 0:9b334a45a8ff 228 // If not repeated start, send stop
bogdanm 0:9b334a45a8ff 229 if (stop) {
bogdanm 0:9b334a45a8ff 230 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 231 // Wait until STOPF flag is set
bogdanm 0:9b334a45a8ff 232 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 233 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
bogdanm 0:9b334a45a8ff 234 timeout--;
bogdanm 0:9b334a45a8ff 235 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 236 return -1;
bogdanm 0:9b334a45a8ff 237 }
bogdanm 0:9b334a45a8ff 238 }
bogdanm 0:9b334a45a8ff 239 // Clear STOP Flag
bogdanm 0:9b334a45a8ff 240 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
bogdanm 0:9b334a45a8ff 241 }
bogdanm 0:9b334a45a8ff 242
bogdanm 0:9b334a45a8ff 243 return count;
bogdanm 0:9b334a45a8ff 244 }
bogdanm 0:9b334a45a8ff 245
bogdanm 0:9b334a45a8ff 246 int i2c_byte_read(i2c_t *obj, int last) {
bogdanm 0:9b334a45a8ff 247 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 248 int timeout;
bogdanm 0:9b334a45a8ff 249
bogdanm 0:9b334a45a8ff 250 // Wait until the byte is received
bogdanm 0:9b334a45a8ff 251 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 252 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
bogdanm 0:9b334a45a8ff 253 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 254 return -1;
bogdanm 0:9b334a45a8ff 255 }
bogdanm 0:9b334a45a8ff 256 }
bogdanm 0:9b334a45a8ff 257
bogdanm 0:9b334a45a8ff 258 return (int)i2c->RXDR;
bogdanm 0:9b334a45a8ff 259 }
bogdanm 0:9b334a45a8ff 260
bogdanm 0:9b334a45a8ff 261 int i2c_byte_write(i2c_t *obj, int data) {
bogdanm 0:9b334a45a8ff 262 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 263 int timeout;
bogdanm 0:9b334a45a8ff 264
bogdanm 0:9b334a45a8ff 265 // Wait until the previous byte is transmitted
bogdanm 0:9b334a45a8ff 266 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 267 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
bogdanm 0:9b334a45a8ff 268 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 269 return 0;
bogdanm 0:9b334a45a8ff 270 }
bogdanm 0:9b334a45a8ff 271 }
bogdanm 0:9b334a45a8ff 272
bogdanm 0:9b334a45a8ff 273 i2c->TXDR = (uint8_t)data;
bogdanm 0:9b334a45a8ff 274
bogdanm 0:9b334a45a8ff 275 return 1;
bogdanm 0:9b334a45a8ff 276 }
bogdanm 0:9b334a45a8ff 277
bogdanm 0:9b334a45a8ff 278 void i2c_reset(i2c_t *obj) {
bogdanm 0:9b334a45a8ff 279 int timeout;
bogdanm 0:9b334a45a8ff 280
bogdanm 0:9b334a45a8ff 281 // Wait before reset
bogdanm 0:9b334a45a8ff 282 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 283 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
bogdanm 0:9b334a45a8ff 284
bogdanm 0:9b334a45a8ff 285 if (obj->i2c == I2C_1) {
bogdanm 0:9b334a45a8ff 286 __I2C1_FORCE_RESET();
bogdanm 0:9b334a45a8ff 287 __I2C1_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 288 }
bogdanm 0:9b334a45a8ff 289 #if defined(I2C2_BASE)
bogdanm 0:9b334a45a8ff 290 if (obj->i2c == I2C_2) {
bogdanm 0:9b334a45a8ff 291 __I2C2_FORCE_RESET();
bogdanm 0:9b334a45a8ff 292 __I2C2_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 293 }
bogdanm 0:9b334a45a8ff 294 #endif
bogdanm 0:9b334a45a8ff 295 }
bogdanm 0:9b334a45a8ff 296
bogdanm 0:9b334a45a8ff 297 #if DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 298
bogdanm 0:9b334a45a8ff 299 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
bogdanm 0:9b334a45a8ff 300 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 301 uint16_t tmpreg = 0;
bogdanm 0:9b334a45a8ff 302
bogdanm 0:9b334a45a8ff 303 // disable
bogdanm 0:9b334a45a8ff 304 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
bogdanm 0:9b334a45a8ff 305 // Get the old register value
bogdanm 0:9b334a45a8ff 306 tmpreg = i2c->OAR1;
bogdanm 0:9b334a45a8ff 307 // Reset address bits
bogdanm 0:9b334a45a8ff 308 tmpreg &= 0xFC00;
bogdanm 0:9b334a45a8ff 309 // Set new address
bogdanm 0:9b334a45a8ff 310 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
bogdanm 0:9b334a45a8ff 311 // Store the new register value
bogdanm 0:9b334a45a8ff 312 i2c->OAR1 = tmpreg;
bogdanm 0:9b334a45a8ff 313 // enable
bogdanm 0:9b334a45a8ff 314 i2c->OAR1 |= I2C_OAR1_OA1EN;
bogdanm 0:9b334a45a8ff 315 }
bogdanm 0:9b334a45a8ff 316
bogdanm 0:9b334a45a8ff 317 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
bogdanm 0:9b334a45a8ff 318 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 319 uint16_t tmpreg;
bogdanm 0:9b334a45a8ff 320
bogdanm 0:9b334a45a8ff 321 // Get the old register value
bogdanm 0:9b334a45a8ff 322 tmpreg = i2c->OAR1;
bogdanm 0:9b334a45a8ff 323
bogdanm 0:9b334a45a8ff 324 // Enable / disable slave
bogdanm 0:9b334a45a8ff 325 if (enable_slave == 1) {
bogdanm 0:9b334a45a8ff 326 tmpreg |= I2C_OAR1_OA1EN;
bogdanm 0:9b334a45a8ff 327 } else {
bogdanm 0:9b334a45a8ff 328 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
bogdanm 0:9b334a45a8ff 329 }
bogdanm 0:9b334a45a8ff 330
bogdanm 0:9b334a45a8ff 331 // Set new mode
bogdanm 0:9b334a45a8ff 332 i2c->OAR1 = tmpreg;
bogdanm 0:9b334a45a8ff 333 }
bogdanm 0:9b334a45a8ff 334
bogdanm 0:9b334a45a8ff 335 // See I2CSlave.h
bogdanm 0:9b334a45a8ff 336 #define NoData 0 // the slave has not been addressed
bogdanm 0:9b334a45a8ff 337 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
bogdanm 0:9b334a45a8ff 338 #define WriteGeneral 2 // the master is writing to all slave
bogdanm 0:9b334a45a8ff 339 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
bogdanm 0:9b334a45a8ff 340
bogdanm 0:9b334a45a8ff 341 int i2c_slave_receive(i2c_t *obj) {
bogdanm 0:9b334a45a8ff 342 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 343 int retValue = NoData;
bogdanm 0:9b334a45a8ff 344
bogdanm 0:9b334a45a8ff 345 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
bogdanm 0:9b334a45a8ff 346 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
bogdanm 0:9b334a45a8ff 347 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
bogdanm 0:9b334a45a8ff 348 retValue = ReadAddressed;
bogdanm 0:9b334a45a8ff 349 else
bogdanm 0:9b334a45a8ff 350 retValue = WriteAddressed;
bogdanm 0:9b334a45a8ff 351
bogdanm 0:9b334a45a8ff 352 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
bogdanm 0:9b334a45a8ff 353 }
bogdanm 0:9b334a45a8ff 354 }
bogdanm 0:9b334a45a8ff 355
bogdanm 0:9b334a45a8ff 356 return (retValue);
bogdanm 0:9b334a45a8ff 357 }
bogdanm 0:9b334a45a8ff 358
bogdanm 0:9b334a45a8ff 359 int i2c_slave_read(i2c_t *obj, char *data, int length) {
bogdanm 0:9b334a45a8ff 360 char size = 0;
bogdanm 0:9b334a45a8ff 361
bogdanm 0:9b334a45a8ff 362 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
bogdanm 0:9b334a45a8ff 363
bogdanm 0:9b334a45a8ff 364 return size;
bogdanm 0:9b334a45a8ff 365 }
bogdanm 0:9b334a45a8ff 366
bogdanm 0:9b334a45a8ff 367 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
bogdanm 0:9b334a45a8ff 368 char size = 0;
bogdanm 0:9b334a45a8ff 369 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 370
bogdanm 0:9b334a45a8ff 371 do {
bogdanm 0:9b334a45a8ff 372 i2c_byte_write(obj, data[size]);
bogdanm 0:9b334a45a8ff 373 size++;
bogdanm 0:9b334a45a8ff 374 } while (size < length);
bogdanm 0:9b334a45a8ff 375
bogdanm 0:9b334a45a8ff 376 return size;
bogdanm 0:9b334a45a8ff 377 }
bogdanm 0:9b334a45a8ff 378
bogdanm 0:9b334a45a8ff 379
bogdanm 0:9b334a45a8ff 380 #endif // DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 381
bogdanm 0:9b334a45a8ff 382 #endif // DEVICE_I2C