siva surendar / mbed-dev

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of mbed-dev by mbed official

targets/hal/TARGET_STM/TARGET_STM32L0/i2c_api.c@34:bb6061527455, 2015-12-07 (annotated)

Committer:
mbed_official
Date:
Mon Dec 07 08:00:11 2015 +0000
Revision:
34:bb6061527455
Parent:
0:9b334a45a8ff
Child:
114:fe4fe5cfc3a3
Synchronized with git revision a41d1d6c02719cd8c7829637b5ae1832821b578f



Full URL: https://github.com/mbedmicro/mbed/commit/a41d1d6c02719cd8c7829637b5ae1832821b578f/



I2C fixes, timeout for startup ~100/200

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 "mbed_error.h"
bogdanm 0:9b334a45a8ff 38 #include "PeripheralPins.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)0x1000)
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 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
bogdanm 0:9b334a45a8ff 49 {
bogdanm 0:9b334a45a8ff 50 static int i2c1_inited = 0;
bogdanm 0:9b334a45a8ff 51 static int i2c2_inited = 0;
bogdanm 0:9b334a45a8ff 52 #if defined(I2C3_BASE)
bogdanm 0:9b334a45a8ff 53 static int i2c3_inited = 0;
bogdanm 0:9b334a45a8ff 54 #endif
bogdanm 0:9b334a45a8ff 55
bogdanm 0:9b334a45a8ff 56 // Determine the I2C to use
bogdanm 0:9b334a45a8ff 57 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 58 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 59
bogdanm 0:9b334a45a8ff 60 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
bogdanm 0:9b334a45a8ff 61 MBED_ASSERT(obj->i2c != (I2CName)NC);
bogdanm 0:9b334a45a8ff 62
bogdanm 0:9b334a45a8ff 63 // Enable I2C1 clock and pinout if not done
bogdanm 0:9b334a45a8ff 64 if ((obj->i2c == I2C_1) && !i2c1_inited) {
bogdanm 0:9b334a45a8ff 65 i2c1_inited = 1;
bogdanm 0:9b334a45a8ff 66 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
bogdanm 0:9b334a45a8ff 67 __I2C1_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 68 // Configure I2C pins
bogdanm 0:9b334a45a8ff 69 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 70 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 71 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 72 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 73 }
bogdanm 0:9b334a45a8ff 74
bogdanm 0:9b334a45a8ff 75 // Enable I2C2 clock and pinout if not done
bogdanm 0:9b334a45a8ff 76 if ((obj->i2c == I2C_2) && !i2c2_inited) {
bogdanm 0:9b334a45a8ff 77 i2c2_inited = 1;
bogdanm 0:9b334a45a8ff 78 __I2C2_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 79 // Configure I2C pins
bogdanm 0:9b334a45a8ff 80 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 81 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 82 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 83 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 84 }
bogdanm 0:9b334a45a8ff 85
bogdanm 0:9b334a45a8ff 86 #if defined(I2C3_BASE)
bogdanm 0:9b334a45a8ff 87 // Enable I2C3 clock and pinout if not done
bogdanm 0:9b334a45a8ff 88 if ((obj->i2c == I2C_3) && !i2c3_inited) {
bogdanm 0:9b334a45a8ff 89 i2c3_inited = 1;
bogdanm 0:9b334a45a8ff 90 __I2C3_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 91 // Configure I2C pins
bogdanm 0:9b334a45a8ff 92 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 93 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 94 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 95 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 96 }
bogdanm 0:9b334a45a8ff 97 #endif
bogdanm 0:9b334a45a8ff 98
bogdanm 0:9b334a45a8ff 99 // Reset to clear pending flags if any
bogdanm 0:9b334a45a8ff 100 i2c_reset(obj);
bogdanm 0:9b334a45a8ff 101
bogdanm 0:9b334a45a8ff 102 // I2C configuration
bogdanm 0:9b334a45a8ff 103 i2c_frequency(obj, 100000); // 100 kHz per default
bogdanm 0:9b334a45a8ff 104 }
bogdanm 0:9b334a45a8ff 105
bogdanm 0:9b334a45a8ff 106 void i2c_frequency(i2c_t *obj, int hz)
bogdanm 0:9b334a45a8ff 107 {
bogdanm 0:9b334a45a8ff 108 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
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 // Common settings: I2C clock = 32 MHz, Analog filter = ON, Digital filter coefficient = 0
bogdanm 0:9b334a45a8ff 117 switch (hz) {
bogdanm 0:9b334a45a8ff 118 case 100000:
bogdanm 0:9b334a45a8ff 119 I2cHandle.Init.Timing = 0x20602938; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
bogdanm 0:9b334a45a8ff 120 break;
bogdanm 0:9b334a45a8ff 121 case 400000:
bogdanm 0:9b334a45a8ff 122 I2cHandle.Init.Timing = 0x00B0122A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
bogdanm 0:9b334a45a8ff 123 break;
bogdanm 0:9b334a45a8ff 124 case 1000000:
bogdanm 0:9b334a45a8ff 125 I2cHandle.Init.Timing = 0x0030040E; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
bogdanm 0:9b334a45a8ff 126 break;
bogdanm 0:9b334a45a8ff 127 default:
bogdanm 0:9b334a45a8ff 128 break;
bogdanm 0:9b334a45a8ff 129 }
bogdanm 0:9b334a45a8ff 130
bogdanm 0:9b334a45a8ff 131 // I2C configuration
bogdanm 0:9b334a45a8ff 132 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
bogdanm 0:9b334a45a8ff 133 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
bogdanm 0:9b334a45a8ff 134 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
bogdanm 0:9b334a45a8ff 135 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
bogdanm 0:9b334a45a8ff 136 I2cHandle.Init.OwnAddress1 = 0;
bogdanm 0:9b334a45a8ff 137 I2cHandle.Init.OwnAddress2 = 0;
bogdanm 0:9b334a45a8ff 138 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
bogdanm 0:9b334a45a8ff 139
bogdanm 0:9b334a45a8ff 140 if (HAL_I2C_Init(&I2cHandle) != HAL_OK) {
bogdanm 0:9b334a45a8ff 141 error("Cannot initialize I2C");
bogdanm 0:9b334a45a8ff 142 }
bogdanm 0:9b334a45a8ff 143 }
bogdanm 0:9b334a45a8ff 144
bogdanm 0:9b334a45a8ff 145 inline int i2c_start(i2c_t *obj)
bogdanm 0:9b334a45a8ff 146 {
bogdanm 0:9b334a45a8ff 147 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 148 int timeout;
bogdanm 0:9b334a45a8ff 149
bogdanm 0:9b334a45a8ff 150 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 151
bogdanm 0:9b334a45a8ff 152 // Clear Acknowledge failure flag
bogdanm 0:9b334a45a8ff 153 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
bogdanm 0:9b334a45a8ff 154
mbed_official 34:bb6061527455 155 // Wait the STOP condition has been previously correctly sent
mbed_official 34:bb6061527455 156 timeout = FLAG_TIMEOUT;
mbed_official 34:bb6061527455 157 while ((i2c->CR2 & I2C_CR2_STOP) == I2C_CR2_STOP){
mbed_official 34:bb6061527455 158 if ((timeout--) == 0) {
mbed_official 34:bb6061527455 159 return 1;
mbed_official 34:bb6061527455 160 }
mbed_official 34:bb6061527455 161 }
mbed_official 34:bb6061527455 162
bogdanm 0:9b334a45a8ff 163 // Generate the START condition
bogdanm 0:9b334a45a8ff 164 i2c->CR2 |= I2C_CR2_START;
bogdanm 0:9b334a45a8ff 165
bogdanm 0:9b334a45a8ff 166 // Wait the START condition has been correctly sent
bogdanm 0:9b334a45a8ff 167 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 168 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
bogdanm 0:9b334a45a8ff 169 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 170 return 1;
bogdanm 0:9b334a45a8ff 171 }
bogdanm 0:9b334a45a8ff 172 }
bogdanm 0:9b334a45a8ff 173
bogdanm 0:9b334a45a8ff 174 return 0;
bogdanm 0:9b334a45a8ff 175 }
bogdanm 0:9b334a45a8ff 176
bogdanm 0:9b334a45a8ff 177 inline int i2c_stop(i2c_t *obj)
bogdanm 0:9b334a45a8ff 178 {
bogdanm 0:9b334a45a8ff 179 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 180
bogdanm 0:9b334a45a8ff 181 // Generate the STOP condition
bogdanm 0:9b334a45a8ff 182 i2c->CR2 |= I2C_CR2_STOP;
bogdanm 0:9b334a45a8ff 183
bogdanm 0:9b334a45a8ff 184 return 0;
bogdanm 0:9b334a45a8ff 185 }
bogdanm 0:9b334a45a8ff 186
bogdanm 0:9b334a45a8ff 187 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
bogdanm 0:9b334a45a8ff 188 {
bogdanm 0:9b334a45a8ff 189 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 190 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 191 int timeout;
bogdanm 0:9b334a45a8ff 192 int count;
bogdanm 0:9b334a45a8ff 193 int value;
bogdanm 0:9b334a45a8ff 194
bogdanm 0:9b334a45a8ff 195 /* update CR2 register */
bogdanm 0:9b334a45a8ff 196 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 197 | (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 198
bogdanm 0:9b334a45a8ff 199 // Read all bytes
bogdanm 0:9b334a45a8ff 200 for (count = 0; count < length; count++) {
bogdanm 0:9b334a45a8ff 201 value = i2c_byte_read(obj, 0);
bogdanm 0:9b334a45a8ff 202 data[count] = (char)value;
bogdanm 0:9b334a45a8ff 203 }
bogdanm 0:9b334a45a8ff 204
bogdanm 0:9b334a45a8ff 205 // Wait transfer complete
bogdanm 0:9b334a45a8ff 206 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 207 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
bogdanm 0:9b334a45a8ff 208 timeout--;
bogdanm 0:9b334a45a8ff 209 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 210 return -1;
bogdanm 0:9b334a45a8ff 211 }
bogdanm 0:9b334a45a8ff 212 }
bogdanm 0:9b334a45a8ff 213
bogdanm 0:9b334a45a8ff 214 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
bogdanm 0:9b334a45a8ff 215
bogdanm 0:9b334a45a8ff 216 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 217 if (stop) {
bogdanm 0:9b334a45a8ff 218 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 219 /* Wait until STOPF flag is set */
bogdanm 0:9b334a45a8ff 220 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 221 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
bogdanm 0:9b334a45a8ff 222 timeout--;
bogdanm 0:9b334a45a8ff 223 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 224 return -1;
bogdanm 0:9b334a45a8ff 225 }
bogdanm 0:9b334a45a8ff 226 }
bogdanm 0:9b334a45a8ff 227 /* Clear STOP Flag */
bogdanm 0:9b334a45a8ff 228 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
bogdanm 0:9b334a45a8ff 229 }
bogdanm 0:9b334a45a8ff 230
bogdanm 0:9b334a45a8ff 231 return length;
bogdanm 0:9b334a45a8ff 232 }
bogdanm 0:9b334a45a8ff 233
bogdanm 0:9b334a45a8ff 234 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
bogdanm 0:9b334a45a8ff 235 {
bogdanm 0:9b334a45a8ff 236 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 237 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 238 int timeout;
bogdanm 0:9b334a45a8ff 239 int count;
bogdanm 0:9b334a45a8ff 240
bogdanm 0:9b334a45a8ff 241 /* update CR2 register */
bogdanm 0:9b334a45a8ff 242 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 243 | (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 244
bogdanm 0:9b334a45a8ff 245 for (count = 0; count < length; count++) {
bogdanm 0:9b334a45a8ff 246 i2c_byte_write(obj, data[count]);
bogdanm 0:9b334a45a8ff 247 }
bogdanm 0:9b334a45a8ff 248
bogdanm 0:9b334a45a8ff 249 // Wait transfer complete
bogdanm 0:9b334a45a8ff 250 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 251 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
bogdanm 0:9b334a45a8ff 252 timeout--;
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 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
bogdanm 0:9b334a45a8ff 259
bogdanm 0:9b334a45a8ff 260 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 261 if (stop) {
bogdanm 0:9b334a45a8ff 262 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 263 /* Wait until STOPF flag is set */
bogdanm 0:9b334a45a8ff 264 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 265 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
bogdanm 0:9b334a45a8ff 266 timeout--;
bogdanm 0:9b334a45a8ff 267 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 268 return -1;
bogdanm 0:9b334a45a8ff 269 }
bogdanm 0:9b334a45a8ff 270 }
bogdanm 0:9b334a45a8ff 271 /* Clear STOP Flag */
bogdanm 0:9b334a45a8ff 272 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
bogdanm 0:9b334a45a8ff 273 }
bogdanm 0:9b334a45a8ff 274
bogdanm 0:9b334a45a8ff 275 return count;
bogdanm 0:9b334a45a8ff 276 }
bogdanm 0:9b334a45a8ff 277
bogdanm 0:9b334a45a8ff 278 int i2c_byte_read(i2c_t *obj, int last)
bogdanm 0:9b334a45a8ff 279 {
bogdanm 0:9b334a45a8ff 280 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 281 int timeout;
bogdanm 0:9b334a45a8ff 282
bogdanm 0:9b334a45a8ff 283 // Wait until the byte is received
bogdanm 0:9b334a45a8ff 284 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 285 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
bogdanm 0:9b334a45a8ff 286 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 287 return -1;
bogdanm 0:9b334a45a8ff 288 }
bogdanm 0:9b334a45a8ff 289 }
bogdanm 0:9b334a45a8ff 290
bogdanm 0:9b334a45a8ff 291 return (int)i2c->RXDR;
bogdanm 0:9b334a45a8ff 292 }
bogdanm 0:9b334a45a8ff 293
bogdanm 0:9b334a45a8ff 294 int i2c_byte_write(i2c_t *obj, int data)
bogdanm 0:9b334a45a8ff 295 {
bogdanm 0:9b334a45a8ff 296 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 297 int timeout;
bogdanm 0:9b334a45a8ff 298
bogdanm 0:9b334a45a8ff 299 // Wait until the previous byte is transmitted
bogdanm 0:9b334a45a8ff 300 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 301 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
bogdanm 0:9b334a45a8ff 302 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 303 return 0;
bogdanm 0:9b334a45a8ff 304 }
bogdanm 0:9b334a45a8ff 305 }
bogdanm 0:9b334a45a8ff 306
bogdanm 0:9b334a45a8ff 307 i2c->TXDR = (uint8_t)data;
bogdanm 0:9b334a45a8ff 308
bogdanm 0:9b334a45a8ff 309 return 1;
bogdanm 0:9b334a45a8ff 310 }
bogdanm 0:9b334a45a8ff 311
bogdanm 0:9b334a45a8ff 312 void i2c_reset(i2c_t *obj)
bogdanm 0:9b334a45a8ff 313 {
bogdanm 0:9b334a45a8ff 314 int timeout;
bogdanm 0:9b334a45a8ff 315
bogdanm 0:9b334a45a8ff 316 // wait before reset
bogdanm 0:9b334a45a8ff 317 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 318 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
bogdanm 0:9b334a45a8ff 319
bogdanm 0:9b334a45a8ff 320 if (obj->i2c == I2C_1) {
bogdanm 0:9b334a45a8ff 321 __I2C1_FORCE_RESET();
bogdanm 0:9b334a45a8ff 322 __I2C1_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 323 }
bogdanm 0:9b334a45a8ff 324 if (obj->i2c == I2C_2) {
bogdanm 0:9b334a45a8ff 325 __I2C2_FORCE_RESET();
bogdanm 0:9b334a45a8ff 326 __I2C2_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 327 }
bogdanm 0:9b334a45a8ff 328 }
bogdanm 0:9b334a45a8ff 329
bogdanm 0:9b334a45a8ff 330 #if DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 331
bogdanm 0:9b334a45a8ff 332 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
bogdanm 0:9b334a45a8ff 333 {
bogdanm 0:9b334a45a8ff 334 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 335 uint16_t tmpreg;
bogdanm 0:9b334a45a8ff 336
bogdanm 0:9b334a45a8ff 337 // disable
bogdanm 0:9b334a45a8ff 338 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
bogdanm 0:9b334a45a8ff 339 // Get the old register value
bogdanm 0:9b334a45a8ff 340 tmpreg = i2c->OAR1;
bogdanm 0:9b334a45a8ff 341 // Reset address bits
bogdanm 0:9b334a45a8ff 342 tmpreg &= 0xFC00;
bogdanm 0:9b334a45a8ff 343 // Set new address
bogdanm 0:9b334a45a8ff 344 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
bogdanm 0:9b334a45a8ff 345 // Store the new register value
bogdanm 0:9b334a45a8ff 346 i2c->OAR1 = tmpreg;
bogdanm 0:9b334a45a8ff 347 // enable
bogdanm 0:9b334a45a8ff 348 i2c->OAR1 |= I2C_OAR1_OA1EN;
bogdanm 0:9b334a45a8ff 349 }
bogdanm 0:9b334a45a8ff 350
bogdanm 0:9b334a45a8ff 351 void i2c_slave_mode(i2c_t *obj, int enable_slave)
bogdanm 0:9b334a45a8ff 352 {
bogdanm 0:9b334a45a8ff 353
bogdanm 0:9b334a45a8ff 354 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 355 uint16_t tmpreg;
bogdanm 0:9b334a45a8ff 356
bogdanm 0:9b334a45a8ff 357 // Get the old register value
bogdanm 0:9b334a45a8ff 358 tmpreg = i2c->OAR1;
bogdanm 0:9b334a45a8ff 359
bogdanm 0:9b334a45a8ff 360 // Enable / disable slave
bogdanm 0:9b334a45a8ff 361 if (enable_slave == 1) {
bogdanm 0:9b334a45a8ff 362 tmpreg |= I2C_OAR1_OA1EN;
bogdanm 0:9b334a45a8ff 363 } else {
bogdanm 0:9b334a45a8ff 364 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
bogdanm 0:9b334a45a8ff 365 }
bogdanm 0:9b334a45a8ff 366
bogdanm 0:9b334a45a8ff 367 // Set new mode
bogdanm 0:9b334a45a8ff 368 i2c->OAR1 = tmpreg;
bogdanm 0:9b334a45a8ff 369
bogdanm 0:9b334a45a8ff 370 }
bogdanm 0:9b334a45a8ff 371
bogdanm 0:9b334a45a8ff 372 // See I2CSlave.h
bogdanm 0:9b334a45a8ff 373 #define NoData 0 // the slave has not been addressed
bogdanm 0:9b334a45a8ff 374 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
bogdanm 0:9b334a45a8ff 375 #define WriteGeneral 2 // the master is writing to all slave
bogdanm 0:9b334a45a8ff 376 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
bogdanm 0:9b334a45a8ff 377
bogdanm 0:9b334a45a8ff 378 int i2c_slave_receive(i2c_t *obj)
bogdanm 0:9b334a45a8ff 379 {
bogdanm 0:9b334a45a8ff 380 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 381 int retValue = NoData;
bogdanm 0:9b334a45a8ff 382
bogdanm 0:9b334a45a8ff 383 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
bogdanm 0:9b334a45a8ff 384 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
bogdanm 0:9b334a45a8ff 385 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
bogdanm 0:9b334a45a8ff 386 retValue = ReadAddressed;
bogdanm 0:9b334a45a8ff 387 else
bogdanm 0:9b334a45a8ff 388 retValue = WriteAddressed;
bogdanm 0:9b334a45a8ff 389 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
bogdanm 0:9b334a45a8ff 390 }
bogdanm 0:9b334a45a8ff 391 }
bogdanm 0:9b334a45a8ff 392
bogdanm 0:9b334a45a8ff 393 return (retValue);
bogdanm 0:9b334a45a8ff 394 }
bogdanm 0:9b334a45a8ff 395
bogdanm 0:9b334a45a8ff 396 int i2c_slave_read(i2c_t *obj, char *data, int length)
bogdanm 0:9b334a45a8ff 397 {
bogdanm 0:9b334a45a8ff 398 char size = 0;
bogdanm 0:9b334a45a8ff 399
bogdanm 0:9b334a45a8ff 400 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
bogdanm 0:9b334a45a8ff 401
bogdanm 0:9b334a45a8ff 402 return size;
bogdanm 0:9b334a45a8ff 403 }
bogdanm 0:9b334a45a8ff 404
bogdanm 0:9b334a45a8ff 405 int i2c_slave_write(i2c_t *obj, const char *data, int length)
bogdanm 0:9b334a45a8ff 406 {
bogdanm 0:9b334a45a8ff 407 char size = 0;
bogdanm 0:9b334a45a8ff 408 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 409
bogdanm 0:9b334a45a8ff 410 do {
bogdanm 0:9b334a45a8ff 411 i2c_byte_write(obj, data[size]);
bogdanm 0:9b334a45a8ff 412 size++;
bogdanm 0:9b334a45a8ff 413 } while (size < length);
bogdanm 0:9b334a45a8ff 414
bogdanm 0:9b334a45a8ff 415 return size;
bogdanm 0:9b334a45a8ff 416 }
bogdanm 0:9b334a45a8ff 417
bogdanm 0:9b334a45a8ff 418
bogdanm 0:9b334a45a8ff 419 #endif // DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 420
bogdanm 0:9b334a45a8ff 421 #endif // DEVICE_I2C