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targets/hal/TARGET_STM/TARGET_STM32F3/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)0x4000)
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 int i2c2_inited = 0;
bogdanm 0:9b334a45a8ff 49 int i2c3_inited = 0;
bogdanm 0:9b334a45a8ff 50
bogdanm 0:9b334a45a8ff 51 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
bogdanm 0:9b334a45a8ff 52 {
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 I2C 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 I2C1 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 if ((obj->i2c == I2C_2) && !i2c2_inited) {
bogdanm 0:9b334a45a8ff 74 i2c2_inited = 1;
bogdanm 0:9b334a45a8ff 75 __I2C2_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 76 // Configure I2C2 pins
bogdanm 0:9b334a45a8ff 77 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 78 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 79 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 80 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 81 }
bogdanm 0:9b334a45a8ff 82 #endif
bogdanm 0:9b334a45a8ff 83
bogdanm 0:9b334a45a8ff 84 #if defined(I2C3_BASE)
bogdanm 0:9b334a45a8ff 85 if ((obj->i2c == I2C_3) && !i2c3_inited) {
bogdanm 0:9b334a45a8ff 86 i2c3_inited = 1;
bogdanm 0:9b334a45a8ff 87 __I2C3_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 88 // Configure I2C3 pins
bogdanm 0:9b334a45a8ff 89 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 90 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 91 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 92 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 93 }
bogdanm 0:9b334a45a8ff 94 #endif
bogdanm 0:9b334a45a8ff 95
bogdanm 0:9b334a45a8ff 96 // Reset to clear pending flags if any
bogdanm 0:9b334a45a8ff 97 i2c_reset(obj);
bogdanm 0:9b334a45a8ff 98
bogdanm 0:9b334a45a8ff 99 // I2C configuration
bogdanm 0:9b334a45a8ff 100 i2c_frequency(obj, 100000); // 100 kHz per default
bogdanm 0:9b334a45a8ff 101 }
bogdanm 0:9b334a45a8ff 102
bogdanm 0:9b334a45a8ff 103 void i2c_frequency(i2c_t *obj, int hz)
bogdanm 0:9b334a45a8ff 104 {
bogdanm 0:9b334a45a8ff 105 uint32_t tim = 0;
bogdanm 0:9b334a45a8ff 106
bogdanm 0:9b334a45a8ff 107 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
bogdanm 0:9b334a45a8ff 108
bogdanm 0:9b334a45a8ff 109 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 110 int timeout;
bogdanm 0:9b334a45a8ff 111
bogdanm 0:9b334a45a8ff 112 // wait before init
bogdanm 0:9b334a45a8ff 113 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 114 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
bogdanm 0:9b334a45a8ff 115
bogdanm 0:9b334a45a8ff 116 // Update the SystemCoreClock variable.
bogdanm 0:9b334a45a8ff 117 SystemCoreClockUpdate();
bogdanm 0:9b334a45a8ff 118
bogdanm 0:9b334a45a8ff 119 /*
bogdanm 0:9b334a45a8ff 120 Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
bogdanm 0:9b334a45a8ff 121 * Standard mode (up to 100 kHz)
bogdanm 0:9b334a45a8ff 122 * Fast Mode (up to 400 kHz)
bogdanm 0:9b334a45a8ff 123 * Fast Mode Plus (up to 1 MHz)
bogdanm 0:9b334a45a8ff 124 Below values obtained with:
bogdanm 0:9b334a45a8ff 125 - I2C clock source = 64 MHz (System Clock w/ HSI) or 72 (System Clock w/ HSE)
bogdanm 0:9b334a45a8ff 126 - Analog filter delay = ON
bogdanm 0:9b334a45a8ff 127 - Digital filter coefficient = 0
bogdanm 0:9b334a45a8ff 128 */
bogdanm 0:9b334a45a8ff 129 if (SystemCoreClock == 64000000) {
bogdanm 0:9b334a45a8ff 130 switch (hz) {
bogdanm 0:9b334a45a8ff 131 case 100000:
bogdanm 0:9b334a45a8ff 132 tim = 0x10B17DB4; // Standard mode with Rise time = 120ns, Fall time = 120ns
bogdanm 0:9b334a45a8ff 133 break;
bogdanm 0:9b334a45a8ff 134 case 400000:
bogdanm 0:9b334a45a8ff 135 tim = 0x00E22163; // Fast Mode with Rise time = 120ns, Fall time = 120ns
bogdanm 0:9b334a45a8ff 136 break;
bogdanm 0:9b334a45a8ff 137 case 1000000:
bogdanm 0:9b334a45a8ff 138 tim = 0x00A00D1E; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
bogdanm 0:9b334a45a8ff 139 break;
bogdanm 0:9b334a45a8ff 140 default:
bogdanm 0:9b334a45a8ff 141 break;
bogdanm 0:9b334a45a8ff 142 }
bogdanm 0:9b334a45a8ff 143 } else if (SystemCoreClock == 72000000) {
bogdanm 0:9b334a45a8ff 144 switch (hz) {
bogdanm 0:9b334a45a8ff 145 case 100000:
bogdanm 0:9b334a45a8ff 146 tim = 0x10D28DCB; // Standard mode with Rise time = 120ns, Fall time = 120ns
bogdanm 0:9b334a45a8ff 147 break;
bogdanm 0:9b334a45a8ff 148 case 400000:
bogdanm 0:9b334a45a8ff 149 tim = 0x00F32571; // Fast Mode with Rise time = 120ns, Fall time = 120ns
bogdanm 0:9b334a45a8ff 150 break;
bogdanm 0:9b334a45a8ff 151 case 1000000:
bogdanm 0:9b334a45a8ff 152 tim = 0x00C00D24; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
bogdanm 0:9b334a45a8ff 153 break;
bogdanm 0:9b334a45a8ff 154 default:
bogdanm 0:9b334a45a8ff 155 break;
bogdanm 0:9b334a45a8ff 156 }
bogdanm 0:9b334a45a8ff 157 }
bogdanm 0:9b334a45a8ff 158
bogdanm 0:9b334a45a8ff 159 // Enable the Fast Mode Plus capability
bogdanm 0:9b334a45a8ff 160 if (hz == 1000000) {
bogdanm 0:9b334a45a8ff 161 if (obj->i2c == I2C_1) {
bogdanm 0:9b334a45a8ff 162 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C1);
bogdanm 0:9b334a45a8ff 163 }
bogdanm 0:9b334a45a8ff 164 #if defined(I2C2_BASE)
bogdanm 0:9b334a45a8ff 165 if (obj->i2c == I2C_2) {
bogdanm 0:9b334a45a8ff 166 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C2);
bogdanm 0:9b334a45a8ff 167 }
bogdanm 0:9b334a45a8ff 168 #endif
bogdanm 0:9b334a45a8ff 169 #if defined(I2C3_BASE)
bogdanm 0:9b334a45a8ff 170 if (obj->i2c == I2C_3) {
bogdanm 0:9b334a45a8ff 171 __HAL_SYSCFG_FASTMODEPLUS_ENABLE(HAL_SYSCFG_FASTMODEPLUS_I2C3);
bogdanm 0:9b334a45a8ff 172 }
bogdanm 0:9b334a45a8ff 173 #endif
bogdanm 0:9b334a45a8ff 174 }
bogdanm 0:9b334a45a8ff 175
bogdanm 0:9b334a45a8ff 176 // I2C configuration
bogdanm 0:9b334a45a8ff 177 I2cHandle.Init.Timing = tim;
bogdanm 0:9b334a45a8ff 178 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
bogdanm 0:9b334a45a8ff 179 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
bogdanm 0:9b334a45a8ff 180 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
bogdanm 0:9b334a45a8ff 181 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
bogdanm 0:9b334a45a8ff 182 I2cHandle.Init.OwnAddress1 = 0;
bogdanm 0:9b334a45a8ff 183 I2cHandle.Init.OwnAddress2 = 0;
bogdanm 0:9b334a45a8ff 184 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
bogdanm 0:9b334a45a8ff 185 HAL_I2C_Init(&I2cHandle);
bogdanm 0:9b334a45a8ff 186 }
bogdanm 0:9b334a45a8ff 187
bogdanm 0:9b334a45a8ff 188 inline int i2c_start(i2c_t *obj)
bogdanm 0:9b334a45a8ff 189 {
bogdanm 0:9b334a45a8ff 190 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 191 int timeout;
bogdanm 0:9b334a45a8ff 192
bogdanm 0:9b334a45a8ff 193 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 194
bogdanm 0:9b334a45a8ff 195 // Clear Acknowledge failure flag
bogdanm 0:9b334a45a8ff 196 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
bogdanm 0:9b334a45a8ff 197
bogdanm 0:9b334a45a8ff 198 // Generate the START condition
bogdanm 0:9b334a45a8ff 199 i2c->CR2 |= I2C_CR2_START;
bogdanm 0:9b334a45a8ff 200
bogdanm 0:9b334a45a8ff 201 // Wait the START condition has been correctly sent
bogdanm 0:9b334a45a8ff 202 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 203 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
bogdanm 0:9b334a45a8ff 204 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 205 return 1;
bogdanm 0:9b334a45a8ff 206 }
bogdanm 0:9b334a45a8ff 207 }
bogdanm 0:9b334a45a8ff 208
bogdanm 0:9b334a45a8ff 209 return 0;
bogdanm 0:9b334a45a8ff 210 }
bogdanm 0:9b334a45a8ff 211
bogdanm 0:9b334a45a8ff 212 inline int i2c_stop(i2c_t *obj)
bogdanm 0:9b334a45a8ff 213 {
bogdanm 0:9b334a45a8ff 214 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 215
bogdanm 0:9b334a45a8ff 216 // Generate the STOP condition
bogdanm 0:9b334a45a8ff 217 i2c->CR2 |= I2C_CR2_STOP;
bogdanm 0:9b334a45a8ff 218
bogdanm 0:9b334a45a8ff 219 return 0;
bogdanm 0:9b334a45a8ff 220 }
bogdanm 0:9b334a45a8ff 221
bogdanm 0:9b334a45a8ff 222 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
bogdanm 0:9b334a45a8ff 223 {
bogdanm 0:9b334a45a8ff 224 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 225 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 226 int timeout;
bogdanm 0:9b334a45a8ff 227 int count;
bogdanm 0:9b334a45a8ff 228 int value;
bogdanm 0:9b334a45a8ff 229
bogdanm 0:9b334a45a8ff 230 /* update CR2 register */
bogdanm 0:9b334a45a8ff 231 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 232 | (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 233
bogdanm 0:9b334a45a8ff 234 // Read all bytes
bogdanm 0:9b334a45a8ff 235 for (count = 0; count < length; count++) {
bogdanm 0:9b334a45a8ff 236 value = i2c_byte_read(obj, 0);
bogdanm 0:9b334a45a8ff 237 data[count] = (char)value;
bogdanm 0:9b334a45a8ff 238 }
bogdanm 0:9b334a45a8ff 239
bogdanm 0:9b334a45a8ff 240 // Wait transfer complete
bogdanm 0:9b334a45a8ff 241 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 242 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
bogdanm 0:9b334a45a8ff 243 timeout--;
bogdanm 0:9b334a45a8ff 244 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 245 return -1;
bogdanm 0:9b334a45a8ff 246 }
bogdanm 0:9b334a45a8ff 247 }
bogdanm 0:9b334a45a8ff 248
bogdanm 0:9b334a45a8ff 249 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
bogdanm 0:9b334a45a8ff 250
bogdanm 0:9b334a45a8ff 251 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 252 if (stop) {
bogdanm 0:9b334a45a8ff 253 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 254 /* Wait until STOPF flag is set */
bogdanm 0:9b334a45a8ff 255 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 256 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
bogdanm 0:9b334a45a8ff 257 timeout--;
bogdanm 0:9b334a45a8ff 258 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 259 return -1;
bogdanm 0:9b334a45a8ff 260 }
bogdanm 0:9b334a45a8ff 261 }
bogdanm 0:9b334a45a8ff 262 /* Clear STOP Flag */
bogdanm 0:9b334a45a8ff 263 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
bogdanm 0:9b334a45a8ff 264 }
bogdanm 0:9b334a45a8ff 265
bogdanm 0:9b334a45a8ff 266 return length;
bogdanm 0:9b334a45a8ff 267 }
bogdanm 0:9b334a45a8ff 268
bogdanm 0:9b334a45a8ff 269 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
bogdanm 0:9b334a45a8ff 270 {
bogdanm 0:9b334a45a8ff 271 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 272 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 273 int timeout;
bogdanm 0:9b334a45a8ff 274 int count;
bogdanm 0:9b334a45a8ff 275
bogdanm 0:9b334a45a8ff 276 /* update CR2 register */
bogdanm 0:9b334a45a8ff 277 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 278 | (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 279
bogdanm 0:9b334a45a8ff 280 for (count = 0; count < length; count++) {
bogdanm 0:9b334a45a8ff 281 i2c_byte_write(obj, data[count]);
bogdanm 0:9b334a45a8ff 282 }
bogdanm 0:9b334a45a8ff 283
bogdanm 0:9b334a45a8ff 284 // Wait transfer complete
bogdanm 0:9b334a45a8ff 285 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 286 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
bogdanm 0:9b334a45a8ff 287 timeout--;
bogdanm 0:9b334a45a8ff 288 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 289 return -1;
bogdanm 0:9b334a45a8ff 290 }
bogdanm 0:9b334a45a8ff 291 }
bogdanm 0:9b334a45a8ff 292
bogdanm 0:9b334a45a8ff 293 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
bogdanm 0:9b334a45a8ff 294
bogdanm 0:9b334a45a8ff 295 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 296 if (stop) {
bogdanm 0:9b334a45a8ff 297 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 298 /* Wait until STOPF flag is set */
bogdanm 0:9b334a45a8ff 299 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 300 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
bogdanm 0:9b334a45a8ff 301 timeout--;
bogdanm 0:9b334a45a8ff 302 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 303 return -1;
bogdanm 0:9b334a45a8ff 304 }
bogdanm 0:9b334a45a8ff 305 }
bogdanm 0:9b334a45a8ff 306 /* Clear STOP Flag */
bogdanm 0:9b334a45a8ff 307 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
bogdanm 0:9b334a45a8ff 308 }
bogdanm 0:9b334a45a8ff 309
bogdanm 0:9b334a45a8ff 310 return count;
bogdanm 0:9b334a45a8ff 311 }
bogdanm 0:9b334a45a8ff 312
bogdanm 0:9b334a45a8ff 313 int i2c_byte_read(i2c_t *obj, int last)
bogdanm 0:9b334a45a8ff 314 {
bogdanm 0:9b334a45a8ff 315 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 316 int timeout;
bogdanm 0:9b334a45a8ff 317
bogdanm 0:9b334a45a8ff 318 // Wait until the byte is received
bogdanm 0:9b334a45a8ff 319 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 320 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
bogdanm 0:9b334a45a8ff 321 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 322 return -1;
bogdanm 0:9b334a45a8ff 323 }
bogdanm 0:9b334a45a8ff 324 }
bogdanm 0:9b334a45a8ff 325
bogdanm 0:9b334a45a8ff 326 return (int)i2c->RXDR;
bogdanm 0:9b334a45a8ff 327 }
bogdanm 0:9b334a45a8ff 328
bogdanm 0:9b334a45a8ff 329 int i2c_byte_write(i2c_t *obj, int data)
bogdanm 0:9b334a45a8ff 330 {
bogdanm 0:9b334a45a8ff 331 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 332 int timeout;
bogdanm 0:9b334a45a8ff 333
bogdanm 0:9b334a45a8ff 334 // Wait until the previous byte is transmitted
bogdanm 0:9b334a45a8ff 335 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 336 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
bogdanm 0:9b334a45a8ff 337 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 338 return 0;
bogdanm 0:9b334a45a8ff 339 }
bogdanm 0:9b334a45a8ff 340 }
bogdanm 0:9b334a45a8ff 341
bogdanm 0:9b334a45a8ff 342 i2c->TXDR = (uint8_t)data;
bogdanm 0:9b334a45a8ff 343
bogdanm 0:9b334a45a8ff 344 return 1;
bogdanm 0:9b334a45a8ff 345 }
bogdanm 0:9b334a45a8ff 346
bogdanm 0:9b334a45a8ff 347 void i2c_reset(i2c_t *obj)
bogdanm 0:9b334a45a8ff 348 {
bogdanm 0:9b334a45a8ff 349 int timeout;
bogdanm 0:9b334a45a8ff 350
bogdanm 0:9b334a45a8ff 351 // wait before reset
bogdanm 0:9b334a45a8ff 352 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 353 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
bogdanm 0:9b334a45a8ff 354
bogdanm 0:9b334a45a8ff 355 __I2C1_FORCE_RESET();
bogdanm 0:9b334a45a8ff 356 __I2C1_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 357 }
bogdanm 0:9b334a45a8ff 358
bogdanm 0:9b334a45a8ff 359 #if DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 360
bogdanm 0:9b334a45a8ff 361 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
bogdanm 0:9b334a45a8ff 362 {
bogdanm 0:9b334a45a8ff 363 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 364 uint16_t tmpreg;
bogdanm 0:9b334a45a8ff 365
bogdanm 0:9b334a45a8ff 366 // disable
bogdanm 0:9b334a45a8ff 367 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
bogdanm 0:9b334a45a8ff 368 // Get the old register value
bogdanm 0:9b334a45a8ff 369 tmpreg = i2c->OAR1;
bogdanm 0:9b334a45a8ff 370 // Reset address bits
bogdanm 0:9b334a45a8ff 371 tmpreg &= 0xFC00;
bogdanm 0:9b334a45a8ff 372 // Set new address
bogdanm 0:9b334a45a8ff 373 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
bogdanm 0:9b334a45a8ff 374 // Store the new register value
bogdanm 0:9b334a45a8ff 375 i2c->OAR1 = tmpreg;
bogdanm 0:9b334a45a8ff 376 // enable
bogdanm 0:9b334a45a8ff 377 i2c->OAR1 |= I2C_OAR1_OA1EN;
bogdanm 0:9b334a45a8ff 378 }
bogdanm 0:9b334a45a8ff 379
bogdanm 0:9b334a45a8ff 380 void i2c_slave_mode(i2c_t *obj, int enable_slave)
bogdanm 0:9b334a45a8ff 381 {
bogdanm 0:9b334a45a8ff 382
bogdanm 0:9b334a45a8ff 383 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 384 uint16_t tmpreg;
bogdanm 0:9b334a45a8ff 385
bogdanm 0:9b334a45a8ff 386 // Get the old register value
bogdanm 0:9b334a45a8ff 387 tmpreg = i2c->OAR1;
bogdanm 0:9b334a45a8ff 388
bogdanm 0:9b334a45a8ff 389 // Enable / disable slave
bogdanm 0:9b334a45a8ff 390 if (enable_slave == 1) {
bogdanm 0:9b334a45a8ff 391 tmpreg |= I2C_OAR1_OA1EN;
bogdanm 0:9b334a45a8ff 392 } else {
bogdanm 0:9b334a45a8ff 393 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
bogdanm 0:9b334a45a8ff 394 }
bogdanm 0:9b334a45a8ff 395
bogdanm 0:9b334a45a8ff 396 // Set new mode
bogdanm 0:9b334a45a8ff 397 i2c->OAR1 = tmpreg;
bogdanm 0:9b334a45a8ff 398
bogdanm 0:9b334a45a8ff 399 }
bogdanm 0:9b334a45a8ff 400
bogdanm 0:9b334a45a8ff 401 // See I2CSlave.h
bogdanm 0:9b334a45a8ff 402 #define NoData 0 // the slave has not been addressed
bogdanm 0:9b334a45a8ff 403 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
bogdanm 0:9b334a45a8ff 404 #define WriteGeneral 2 // the master is writing to all slave
bogdanm 0:9b334a45a8ff 405 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
bogdanm 0:9b334a45a8ff 406
bogdanm 0:9b334a45a8ff 407 int i2c_slave_receive(i2c_t *obj)
bogdanm 0:9b334a45a8ff 408 {
bogdanm 0:9b334a45a8ff 409 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 410 int retValue = NoData;
bogdanm 0:9b334a45a8ff 411
bogdanm 0:9b334a45a8ff 412 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
bogdanm 0:9b334a45a8ff 413 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
bogdanm 0:9b334a45a8ff 414 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
bogdanm 0:9b334a45a8ff 415 retValue = ReadAddressed;
bogdanm 0:9b334a45a8ff 416 else
bogdanm 0:9b334a45a8ff 417 retValue = WriteAddressed;
bogdanm 0:9b334a45a8ff 418 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
bogdanm 0:9b334a45a8ff 419 }
bogdanm 0:9b334a45a8ff 420 }
bogdanm 0:9b334a45a8ff 421
bogdanm 0:9b334a45a8ff 422 return (retValue);
bogdanm 0:9b334a45a8ff 423 }
bogdanm 0:9b334a45a8ff 424
bogdanm 0:9b334a45a8ff 425 int i2c_slave_read(i2c_t *obj, char *data, int length)
bogdanm 0:9b334a45a8ff 426 {
bogdanm 0:9b334a45a8ff 427 char size = 0;
bogdanm 0:9b334a45a8ff 428
bogdanm 0:9b334a45a8ff 429 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
bogdanm 0:9b334a45a8ff 430
bogdanm 0:9b334a45a8ff 431 return size;
bogdanm 0:9b334a45a8ff 432 }
bogdanm 0:9b334a45a8ff 433
bogdanm 0:9b334a45a8ff 434 int i2c_slave_write(i2c_t *obj, const char *data, int length)
bogdanm 0:9b334a45a8ff 435 {
bogdanm 0:9b334a45a8ff 436 char size = 0;
bogdanm 0:9b334a45a8ff 437 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 438
bogdanm 0:9b334a45a8ff 439 do {
bogdanm 0:9b334a45a8ff 440 i2c_byte_write(obj, data[size]);
bogdanm 0:9b334a45a8ff 441 size++;
bogdanm 0:9b334a45a8ff 442 } while (size < length);
bogdanm 0:9b334a45a8ff 443
bogdanm 0:9b334a45a8ff 444 return size;
bogdanm 0:9b334a45a8ff 445 }
bogdanm 0:9b334a45a8ff 446
bogdanm 0:9b334a45a8ff 447
bogdanm 0:9b334a45a8ff 448 #endif // DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 449
bogdanm 0:9b334a45a8ff 450 #endif // DEVICE_I2C