Fawwaz Nadzmy / mbed-STM

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targets/hal/TARGET_STM/TARGET_STM32F7/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) 2015, 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 #include "mbed_error.h"
bogdanm 0:9b334a45a8ff 39
bogdanm 0:9b334a45a8ff 40 /* Timeout values for flags and events waiting loops. These timeouts are
bogdanm 0:9b334a45a8ff 41 not based on accurate values, they just guarantee that the application will
bogdanm 0:9b334a45a8ff 42 not remain stuck if the I2C communication is corrupted. */
bogdanm 0:9b334a45a8ff 43 #define FLAG_TIMEOUT ((int)0x4000)
bogdanm 0:9b334a45a8ff 44 #define LONG_TIMEOUT ((int)0x8000)
bogdanm 0:9b334a45a8ff 45
bogdanm 0:9b334a45a8ff 46 I2C_HandleTypeDef I2cHandle;
bogdanm 0:9b334a45a8ff 47
bogdanm 0:9b334a45a8ff 48 int i2c1_inited = 0;
bogdanm 0:9b334a45a8ff 49 /* Ready for next F7 devices
bogdanm 0:9b334a45a8ff 50 int i2c2_inited = 0;
bogdanm 0:9b334a45a8ff 51 int i2c3_inited = 0;
bogdanm 0:9b334a45a8ff 52 int i2c4_inited = 0;
bogdanm 0:9b334a45a8ff 53 */
bogdanm 0:9b334a45a8ff 54
bogdanm 0:9b334a45a8ff 55 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
bogdanm 0:9b334a45a8ff 56 {
bogdanm 0:9b334a45a8ff 57 // Determine the I2C to use
bogdanm 0:9b334a45a8ff 58 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 59 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 60
bogdanm 0:9b334a45a8ff 61 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
bogdanm 0:9b334a45a8ff 62 MBED_ASSERT(obj->i2c != (I2CName)NC);
bogdanm 0:9b334a45a8ff 63
bogdanm 0:9b334a45a8ff 64 // Enable I2C clock and pinout if not done
bogdanm 0:9b334a45a8ff 65 if ((obj->i2c == I2C_1) && !i2c1_inited) {
bogdanm 0:9b334a45a8ff 66 i2c1_inited = 1;
bogdanm 0:9b334a45a8ff 67 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_PCLK1);
bogdanm 0:9b334a45a8ff 68 __HAL_RCC_I2C1_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 69 // Configure I2C1 pins
bogdanm 0:9b334a45a8ff 70 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 71 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 72 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 73 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 74 }
bogdanm 0:9b334a45a8ff 75
bogdanm 0:9b334a45a8ff 76 /* Ready for next F7 devices
bogdanm 0:9b334a45a8ff 77 #if defined(I2C2_BASE)
bogdanm 0:9b334a45a8ff 78 if ((obj->i2c == I2C_2) && !i2c2_inited) {
bogdanm 0:9b334a45a8ff 79 i2c2_inited = 1;
bogdanm 0:9b334a45a8ff 80 __HAL_RCC_I2C2_CONFIG(RCC_I2C2CLKSOURCE_PCLK1);
bogdanm 0:9b334a45a8ff 81 __HAL_RCC_I2C2_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 82 // Configure I2C2 pins
bogdanm 0:9b334a45a8ff 83 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 84 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 85 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 86 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 87 }
bogdanm 0:9b334a45a8ff 88 #endif
bogdanm 0:9b334a45a8ff 89
bogdanm 0:9b334a45a8ff 90 #if defined(I2C3_BASE)
bogdanm 0:9b334a45a8ff 91 if ((obj->i2c == I2C_3) && !i2c3_inited) {
bogdanm 0:9b334a45a8ff 92 i2c3_inited = 1;
bogdanm 0:9b334a45a8ff 93 __HAL_RCC_I2C3_CONFIG(RCC_I2C3CLKSOURCE_PCLK1);
bogdanm 0:9b334a45a8ff 94 __HAL_RCC_I2C3_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 95 // Configure I2C3 pins
bogdanm 0:9b334a45a8ff 96 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 97 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 98 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 99 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 100 }
bogdanm 0:9b334a45a8ff 101 #endif
bogdanm 0:9b334a45a8ff 102
bogdanm 0:9b334a45a8ff 103 #if defined(I2C4_BASE)
bogdanm 0:9b334a45a8ff 104 if ((obj->i2c == I2C_4) && !i2c4_inited) {
bogdanm 0:9b334a45a8ff 105 i2c4_inited = 1;
bogdanm 0:9b334a45a8ff 106 __HAL_RCC_I2C4_CONFIG(RCC_I2C4CLKSOURCE_PCLK1);
bogdanm 0:9b334a45a8ff 107 __HAL_RCC_I2C4_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 108 // Configure I2C4 pins
bogdanm 0:9b334a45a8ff 109 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 110 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 111 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 112 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 113 }
bogdanm 0:9b334a45a8ff 114 #endif
bogdanm 0:9b334a45a8ff 115 */
bogdanm 0:9b334a45a8ff 116
bogdanm 0:9b334a45a8ff 117 // Reset to clear pending flags if any
bogdanm 0:9b334a45a8ff 118 i2c_reset(obj);
bogdanm 0:9b334a45a8ff 119
bogdanm 0:9b334a45a8ff 120 // I2C configuration
bogdanm 0:9b334a45a8ff 121 i2c_frequency(obj, 100000); // 100 kHz per default
bogdanm 0:9b334a45a8ff 122 }
bogdanm 0:9b334a45a8ff 123
bogdanm 0:9b334a45a8ff 124 void i2c_frequency(i2c_t *obj, int hz)
bogdanm 0:9b334a45a8ff 125 {
bogdanm 0:9b334a45a8ff 126 uint32_t tim = 0;
bogdanm 0:9b334a45a8ff 127
bogdanm 0:9b334a45a8ff 128 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
bogdanm 0:9b334a45a8ff 129
bogdanm 0:9b334a45a8ff 130 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 131 int timeout;
bogdanm 0:9b334a45a8ff 132
bogdanm 0:9b334a45a8ff 133 // wait before init
bogdanm 0:9b334a45a8ff 134 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 135 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0)) {}
bogdanm 0:9b334a45a8ff 136
bogdanm 0:9b334a45a8ff 137 /*
bogdanm 0:9b334a45a8ff 138 Values calculated with I2C_Timing_Configuration tool (excel file)
bogdanm 0:9b334a45a8ff 139 * Standard mode (up to 100 kHz)
bogdanm 0:9b334a45a8ff 140 * Fast Mode (up to 400 kHz)
bogdanm 0:9b334a45a8ff 141 * Fast Mode Plus (up to 1 MHz)
bogdanm 0:9b334a45a8ff 142 Below values obtained with:
bogdanm 0:9b334a45a8ff 143 - I2Cx clock source = APB1CLK = 54 MHz
bogdanm 0:9b334a45a8ff 144 - Analog filter delay = ON
bogdanm 0:9b334a45a8ff 145 - Digital filter coefficient = 0
bogdanm 0:9b334a45a8ff 146 */
bogdanm 0:9b334a45a8ff 147 switch (hz) {
bogdanm 0:9b334a45a8ff 148 case 100000:
bogdanm 0:9b334a45a8ff 149 tim = 0x10916998; // Standard mode with Rise time = 120ns, Fall time = 120ns
bogdanm 0:9b334a45a8ff 150 break;
bogdanm 0:9b334a45a8ff 151 case 400000:
bogdanm 0:9b334a45a8ff 152 tim = 0x00B11B54; // Fast Mode with Rise time = 120ns, Fall time = 120ns
bogdanm 0:9b334a45a8ff 153 break;
bogdanm 0:9b334a45a8ff 154 case 1000000:
bogdanm 0:9b334a45a8ff 155 tim = 0x0090091B; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
bogdanm 0:9b334a45a8ff 156 break;
bogdanm 0:9b334a45a8ff 157 default:
bogdanm 0:9b334a45a8ff 158 break;
bogdanm 0:9b334a45a8ff 159 }
bogdanm 0:9b334a45a8ff 160
bogdanm 0:9b334a45a8ff 161 // I2C configuration
bogdanm 0:9b334a45a8ff 162 I2cHandle.Init.Timing = tim;
bogdanm 0:9b334a45a8ff 163 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
bogdanm 0:9b334a45a8ff 164 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
bogdanm 0:9b334a45a8ff 165 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
bogdanm 0:9b334a45a8ff 166 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
bogdanm 0:9b334a45a8ff 167 I2cHandle.Init.OwnAddress1 = 0;
bogdanm 0:9b334a45a8ff 168 I2cHandle.Init.OwnAddress2 = 0;
bogdanm 0:9b334a45a8ff 169 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
bogdanm 0:9b334a45a8ff 170
bogdanm 0:9b334a45a8ff 171 if (HAL_I2C_Init(&I2cHandle) != HAL_OK) {
bogdanm 0:9b334a45a8ff 172 error("Cannot initialize I2C");
bogdanm 0:9b334a45a8ff 173 }
bogdanm 0:9b334a45a8ff 174 }
bogdanm 0:9b334a45a8ff 175
bogdanm 0:9b334a45a8ff 176 inline int i2c_start(i2c_t *obj)
bogdanm 0:9b334a45a8ff 177 {
bogdanm 0:9b334a45a8ff 178 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 179 int timeout;
bogdanm 0:9b334a45a8ff 180
bogdanm 0:9b334a45a8ff 181 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 182
bogdanm 0:9b334a45a8ff 183 // Clear Acknowledge failure flag
bogdanm 0:9b334a45a8ff 184 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
bogdanm 0:9b334a45a8ff 185
bogdanm 0:9b334a45a8ff 186 // Generate the START condition
bogdanm 0:9b334a45a8ff 187 i2c->CR2 |= I2C_CR2_START;
bogdanm 0:9b334a45a8ff 188
bogdanm 0:9b334a45a8ff 189 // Wait the START condition has been correctly sent
bogdanm 0:9b334a45a8ff 190 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 191 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
bogdanm 0:9b334a45a8ff 192 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 193 return 1;
bogdanm 0:9b334a45a8ff 194 }
bogdanm 0:9b334a45a8ff 195 }
bogdanm 0:9b334a45a8ff 196
bogdanm 0:9b334a45a8ff 197 return 0;
bogdanm 0:9b334a45a8ff 198 }
bogdanm 0:9b334a45a8ff 199
bogdanm 0:9b334a45a8ff 200 inline int i2c_stop(i2c_t *obj)
bogdanm 0:9b334a45a8ff 201 {
bogdanm 0:9b334a45a8ff 202 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 203
bogdanm 0:9b334a45a8ff 204 // Generate the STOP condition
bogdanm 0:9b334a45a8ff 205 i2c->CR2 |= I2C_CR2_STOP;
bogdanm 0:9b334a45a8ff 206
bogdanm 0:9b334a45a8ff 207 return 0;
bogdanm 0:9b334a45a8ff 208 }
bogdanm 0:9b334a45a8ff 209
bogdanm 0:9b334a45a8ff 210 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
bogdanm 0:9b334a45a8ff 211 {
bogdanm 0:9b334a45a8ff 212 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 213 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 214 int timeout;
bogdanm 0:9b334a45a8ff 215 int count;
bogdanm 0:9b334a45a8ff 216 int value;
bogdanm 0:9b334a45a8ff 217
bogdanm 0:9b334a45a8ff 218 /* update CR2 register */
bogdanm 0:9b334a45a8ff 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)))
bogdanm 0:9b334a45a8ff 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_READ);
bogdanm 0:9b334a45a8ff 221
bogdanm 0:9b334a45a8ff 222 // Read all bytes
bogdanm 0:9b334a45a8ff 223 for (count = 0; count < length; count++) {
bogdanm 0:9b334a45a8ff 224 value = i2c_byte_read(obj, 0);
bogdanm 0:9b334a45a8ff 225 data[count] = (char)value;
bogdanm 0:9b334a45a8ff 226 }
bogdanm 0:9b334a45a8ff 227
bogdanm 0:9b334a45a8ff 228 // Wait transfer complete
bogdanm 0:9b334a45a8ff 229 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 230 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
bogdanm 0:9b334a45a8ff 231 timeout--;
bogdanm 0:9b334a45a8ff 232 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 233 return -1;
bogdanm 0:9b334a45a8ff 234 }
bogdanm 0:9b334a45a8ff 235 }
bogdanm 0:9b334a45a8ff 236
bogdanm 0:9b334a45a8ff 237 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
bogdanm 0:9b334a45a8ff 238
bogdanm 0:9b334a45a8ff 239 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 240 if (stop) {
bogdanm 0:9b334a45a8ff 241 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 242 /* Wait until STOPF flag is set */
bogdanm 0:9b334a45a8ff 243 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 244 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
bogdanm 0:9b334a45a8ff 245 timeout--;
bogdanm 0:9b334a45a8ff 246 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 247 return -1;
bogdanm 0:9b334a45a8ff 248 }
bogdanm 0:9b334a45a8ff 249 }
bogdanm 0:9b334a45a8ff 250 /* Clear STOP Flag */
bogdanm 0:9b334a45a8ff 251 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
bogdanm 0:9b334a45a8ff 252 }
bogdanm 0:9b334a45a8ff 253
bogdanm 0:9b334a45a8ff 254 return length;
bogdanm 0:9b334a45a8ff 255 }
bogdanm 0:9b334a45a8ff 256
bogdanm 0:9b334a45a8ff 257 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
bogdanm 0:9b334a45a8ff 258 {
bogdanm 0:9b334a45a8ff 259 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 260 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 261 int timeout;
bogdanm 0:9b334a45a8ff 262 int count;
bogdanm 0:9b334a45a8ff 263
bogdanm 0:9b334a45a8ff 264 /* update CR2 register */
bogdanm 0:9b334a45a8ff 265 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 266 | (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 267
bogdanm 0:9b334a45a8ff 268 for (count = 0; count < length; count++) {
bogdanm 0:9b334a45a8ff 269 i2c_byte_write(obj, data[count]);
bogdanm 0:9b334a45a8ff 270 }
bogdanm 0:9b334a45a8ff 271
bogdanm 0:9b334a45a8ff 272 // Wait transfer complete
bogdanm 0:9b334a45a8ff 273 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 274 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
bogdanm 0:9b334a45a8ff 275 timeout--;
bogdanm 0:9b334a45a8ff 276 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 277 return -1;
bogdanm 0:9b334a45a8ff 278 }
bogdanm 0:9b334a45a8ff 279 }
bogdanm 0:9b334a45a8ff 280
bogdanm 0:9b334a45a8ff 281 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
bogdanm 0:9b334a45a8ff 282
bogdanm 0:9b334a45a8ff 283 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 284 if (stop) {
bogdanm 0:9b334a45a8ff 285 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 286 /* Wait until STOPF flag is set */
bogdanm 0:9b334a45a8ff 287 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 288 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
bogdanm 0:9b334a45a8ff 289 timeout--;
bogdanm 0:9b334a45a8ff 290 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 291 return -1;
bogdanm 0:9b334a45a8ff 292 }
bogdanm 0:9b334a45a8ff 293 }
bogdanm 0:9b334a45a8ff 294 /* Clear STOP Flag */
bogdanm 0:9b334a45a8ff 295 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
bogdanm 0:9b334a45a8ff 296 }
bogdanm 0:9b334a45a8ff 297
bogdanm 0:9b334a45a8ff 298 return count;
bogdanm 0:9b334a45a8ff 299 }
bogdanm 0:9b334a45a8ff 300
bogdanm 0:9b334a45a8ff 301 int i2c_byte_read(i2c_t *obj, int last)
bogdanm 0:9b334a45a8ff 302 {
bogdanm 0:9b334a45a8ff 303 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 304 int timeout;
bogdanm 0:9b334a45a8ff 305
bogdanm 0:9b334a45a8ff 306 // Wait until the byte is received
bogdanm 0:9b334a45a8ff 307 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 308 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
bogdanm 0:9b334a45a8ff 309 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 310 return -1;
bogdanm 0:9b334a45a8ff 311 }
bogdanm 0:9b334a45a8ff 312 }
bogdanm 0:9b334a45a8ff 313
bogdanm 0:9b334a45a8ff 314 return (int)i2c->RXDR;
bogdanm 0:9b334a45a8ff 315 }
bogdanm 0:9b334a45a8ff 316
bogdanm 0:9b334a45a8ff 317 int i2c_byte_write(i2c_t *obj, int data)
bogdanm 0:9b334a45a8ff 318 {
bogdanm 0:9b334a45a8ff 319 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 320 int timeout;
bogdanm 0:9b334a45a8ff 321
bogdanm 0:9b334a45a8ff 322 // Wait until the previous byte is transmitted
bogdanm 0:9b334a45a8ff 323 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 324 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
bogdanm 0:9b334a45a8ff 325 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 326 return 0;
bogdanm 0:9b334a45a8ff 327 }
bogdanm 0:9b334a45a8ff 328 }
bogdanm 0:9b334a45a8ff 329
bogdanm 0:9b334a45a8ff 330 i2c->TXDR = (uint8_t)data;
bogdanm 0:9b334a45a8ff 331
bogdanm 0:9b334a45a8ff 332 return 1;
bogdanm 0:9b334a45a8ff 333 }
bogdanm 0:9b334a45a8ff 334
bogdanm 0:9b334a45a8ff 335 void i2c_reset(i2c_t *obj)
bogdanm 0:9b334a45a8ff 336 {
bogdanm 0:9b334a45a8ff 337 int timeout;
bogdanm 0:9b334a45a8ff 338
bogdanm 0:9b334a45a8ff 339 // wait before reset
bogdanm 0:9b334a45a8ff 340 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 341 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
bogdanm 0:9b334a45a8ff 342
bogdanm 0:9b334a45a8ff 343 __I2C1_FORCE_RESET();
bogdanm 0:9b334a45a8ff 344 __I2C1_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 345 }
bogdanm 0:9b334a45a8ff 346
bogdanm 0:9b334a45a8ff 347 #if DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 348
bogdanm 0:9b334a45a8ff 349 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
bogdanm 0:9b334a45a8ff 350 {
bogdanm 0:9b334a45a8ff 351 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 352 uint16_t tmpreg;
bogdanm 0:9b334a45a8ff 353
bogdanm 0:9b334a45a8ff 354 // disable
bogdanm 0:9b334a45a8ff 355 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
bogdanm 0:9b334a45a8ff 356 // Get the old register value
bogdanm 0:9b334a45a8ff 357 tmpreg = i2c->OAR1;
bogdanm 0:9b334a45a8ff 358 // Reset address bits
bogdanm 0:9b334a45a8ff 359 tmpreg &= 0xFC00;
bogdanm 0:9b334a45a8ff 360 // Set new address
bogdanm 0:9b334a45a8ff 361 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
bogdanm 0:9b334a45a8ff 362 // Store the new register value
bogdanm 0:9b334a45a8ff 363 i2c->OAR1 = tmpreg;
bogdanm 0:9b334a45a8ff 364 // enable
bogdanm 0:9b334a45a8ff 365 i2c->OAR1 |= I2C_OAR1_OA1EN;
bogdanm 0:9b334a45a8ff 366 }
bogdanm 0:9b334a45a8ff 367
bogdanm 0:9b334a45a8ff 368 void i2c_slave_mode(i2c_t *obj, int enable_slave)
bogdanm 0:9b334a45a8ff 369 {
bogdanm 0:9b334a45a8ff 370
bogdanm 0:9b334a45a8ff 371 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 372 uint16_t tmpreg;
bogdanm 0:9b334a45a8ff 373
bogdanm 0:9b334a45a8ff 374 // Get the old register value
bogdanm 0:9b334a45a8ff 375 tmpreg = i2c->OAR1;
bogdanm 0:9b334a45a8ff 376
bogdanm 0:9b334a45a8ff 377 // Enable / disable slave
bogdanm 0:9b334a45a8ff 378 if (enable_slave == 1) {
bogdanm 0:9b334a45a8ff 379 tmpreg |= I2C_OAR1_OA1EN;
bogdanm 0:9b334a45a8ff 380 } else {
bogdanm 0:9b334a45a8ff 381 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
bogdanm 0:9b334a45a8ff 382 }
bogdanm 0:9b334a45a8ff 383
bogdanm 0:9b334a45a8ff 384 // Set new mode
bogdanm 0:9b334a45a8ff 385 i2c->OAR1 = tmpreg;
bogdanm 0:9b334a45a8ff 386
bogdanm 0:9b334a45a8ff 387 }
bogdanm 0:9b334a45a8ff 388
bogdanm 0:9b334a45a8ff 389 // See I2CSlave.h
bogdanm 0:9b334a45a8ff 390 #define NoData 0 // the slave has not been addressed
bogdanm 0:9b334a45a8ff 391 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
bogdanm 0:9b334a45a8ff 392 #define WriteGeneral 2 // the master is writing to all slave
bogdanm 0:9b334a45a8ff 393 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
bogdanm 0:9b334a45a8ff 394
bogdanm 0:9b334a45a8ff 395 int i2c_slave_receive(i2c_t *obj)
bogdanm 0:9b334a45a8ff 396 {
bogdanm 0:9b334a45a8ff 397 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 398 int retValue = NoData;
bogdanm 0:9b334a45a8ff 399
bogdanm 0:9b334a45a8ff 400 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
bogdanm 0:9b334a45a8ff 401 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
bogdanm 0:9b334a45a8ff 402 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
bogdanm 0:9b334a45a8ff 403 retValue = ReadAddressed;
bogdanm 0:9b334a45a8ff 404 else
bogdanm 0:9b334a45a8ff 405 retValue = WriteAddressed;
bogdanm 0:9b334a45a8ff 406 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
bogdanm 0:9b334a45a8ff 407 }
bogdanm 0:9b334a45a8ff 408 }
bogdanm 0:9b334a45a8ff 409
bogdanm 0:9b334a45a8ff 410 return (retValue);
bogdanm 0:9b334a45a8ff 411 }
bogdanm 0:9b334a45a8ff 412
bogdanm 0:9b334a45a8ff 413 int i2c_slave_read(i2c_t *obj, char *data, int length)
bogdanm 0:9b334a45a8ff 414 {
bogdanm 0:9b334a45a8ff 415 char size = 0;
bogdanm 0:9b334a45a8ff 416
bogdanm 0:9b334a45a8ff 417 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
bogdanm 0:9b334a45a8ff 418
bogdanm 0:9b334a45a8ff 419 return size;
bogdanm 0:9b334a45a8ff 420 }
bogdanm 0:9b334a45a8ff 421
bogdanm 0:9b334a45a8ff 422 int i2c_slave_write(i2c_t *obj, const char *data, int length)
bogdanm 0:9b334a45a8ff 423 {
bogdanm 0:9b334a45a8ff 424 char size = 0;
bogdanm 0:9b334a45a8ff 425 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 426
bogdanm 0:9b334a45a8ff 427 do {
bogdanm 0:9b334a45a8ff 428 i2c_byte_write(obj, data[size]);
bogdanm 0:9b334a45a8ff 429 size++;
bogdanm 0:9b334a45a8ff 430 } while (size < length);
bogdanm 0:9b334a45a8ff 431
bogdanm 0:9b334a45a8ff 432 return size;
bogdanm 0:9b334a45a8ff 433 }
bogdanm 0:9b334a45a8ff 434
bogdanm 0:9b334a45a8ff 435
bogdanm 0:9b334a45a8ff 436 #endif // DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 437
bogdanm 0:9b334a45a8ff 438 #endif // DEVICE_I2C