Krzysztof Sitko / mbed-dev-STM32F031K6

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targets/hal/TARGET_STM/TARGET_STM32F1/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 
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) 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 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
bogdanm 0:9b334a45a8ff 48 {
bogdanm 0:9b334a45a8ff 49 static int i2c1_inited = 0;
bogdanm 0:9b334a45a8ff 50 static int i2c2_inited = 0;
bogdanm 0:9b334a45a8ff 51
bogdanm 0:9b334a45a8ff 52 // Determine the I2C to use
bogdanm 0:9b334a45a8ff 53 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 54 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 55
bogdanm 0:9b334a45a8ff 56 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
bogdanm 0:9b334a45a8ff 57 MBED_ASSERT(obj->i2c != (I2CName)NC);
bogdanm 0:9b334a45a8ff 58
bogdanm 0:9b334a45a8ff 59 // Check if I2C peripherals are already configured
bogdanm 0:9b334a45a8ff 60 if ((obj->i2c == I2C_1) && i2c1_inited) return;
bogdanm 0:9b334a45a8ff 61 if ((obj->i2c == I2C_2) && i2c2_inited) return;
bogdanm 0:9b334a45a8ff 62
bogdanm 0:9b334a45a8ff 63 // Set I2C clock
bogdanm 0:9b334a45a8ff 64 if (obj->i2c == I2C_1) {
bogdanm 0:9b334a45a8ff 65 i2c1_inited = 1;
bogdanm 0:9b334a45a8ff 66 __I2C1_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 67 }
bogdanm 0:9b334a45a8ff 68
bogdanm 0:9b334a45a8ff 69 if (obj->i2c == I2C_2) {
bogdanm 0:9b334a45a8ff 70 i2c2_inited = 1;
bogdanm 0:9b334a45a8ff 71 __I2C2_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 72 }
bogdanm 0:9b334a45a8ff 73
bogdanm 0:9b334a45a8ff 74 // Configure I2C pins
bogdanm 0:9b334a45a8ff 75 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 76 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 77 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 78 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 79
bogdanm 0:9b334a45a8ff 80 // Reset to clear pending flags if any
bogdanm 0:9b334a45a8ff 81 i2c_reset(obj);
bogdanm 0:9b334a45a8ff 82
bogdanm 0:9b334a45a8ff 83 // I2C configuration
bogdanm 0:9b334a45a8ff 84 i2c_frequency(obj, 100000); // 100 kHz per default
bogdanm 0:9b334a45a8ff 85
bogdanm 0:9b334a45a8ff 86 // I2C master by default
bogdanm 0:9b334a45a8ff 87 obj->slave = 0;
bogdanm 0:9b334a45a8ff 88 }
bogdanm 0:9b334a45a8ff 89
bogdanm 0:9b334a45a8ff 90 void i2c_frequency(i2c_t *obj, int hz)
bogdanm 0:9b334a45a8ff 91 {
bogdanm 0:9b334a45a8ff 92 MBED_ASSERT((hz != 0) && (hz <= 400000));
bogdanm 0:9b334a45a8ff 93 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 94 int timeout;
bogdanm 0:9b334a45a8ff 95
bogdanm 0:9b334a45a8ff 96 // wait before init
bogdanm 0:9b334a45a8ff 97 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 98 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
bogdanm 0:9b334a45a8ff 99
bogdanm 0:9b334a45a8ff 100 // I2C configuration
bogdanm 0:9b334a45a8ff 101 I2cHandle.Init.ClockSpeed = hz;
bogdanm 0:9b334a45a8ff 102 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
bogdanm 0:9b334a45a8ff 103 I2cHandle.Init.OwnAddress1 = 0;
bogdanm 0:9b334a45a8ff 104 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
bogdanm 0:9b334a45a8ff 105 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
bogdanm 0:9b334a45a8ff 106 I2cHandle.Init.OwnAddress2 = 0;
bogdanm 0:9b334a45a8ff 107 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
bogdanm 0:9b334a45a8ff 108 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
bogdanm 0:9b334a45a8ff 109 HAL_I2C_Init(&I2cHandle);
bogdanm 0:9b334a45a8ff 110
bogdanm 0:9b334a45a8ff 111 if (obj->slave) {
bogdanm 0:9b334a45a8ff 112 // Enable Address Acknowledge
bogdanm 0:9b334a45a8ff 113 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
bogdanm 0:9b334a45a8ff 114 }
bogdanm 0:9b334a45a8ff 115 }
bogdanm 0:9b334a45a8ff 116
bogdanm 0:9b334a45a8ff 117 inline int i2c_start(i2c_t *obj)
bogdanm 0:9b334a45a8ff 118 {
bogdanm 0:9b334a45a8ff 119 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 120 int timeout;
bogdanm 0:9b334a45a8ff 121
bogdanm 0:9b334a45a8ff 122 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 123
bogdanm 0:9b334a45a8ff 124 // Clear Acknowledge failure flag
bogdanm 0:9b334a45a8ff 125 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
bogdanm 0:9b334a45a8ff 126
mbed_official 34:bb6061527455 127 // Wait the STOP condition has been previously correctly sent
mbed_official 34:bb6061527455 128 // This timeout can be avoid in some specific cases by simply clearing the STOP bit
mbed_official 34:bb6061527455 129 timeout = FLAG_TIMEOUT;
mbed_official 34:bb6061527455 130 while ((i2c->CR1 & I2C_CR1_STOP) == I2C_CR1_STOP) {
mbed_official 34:bb6061527455 131 if ((timeout--) == 0) {
mbed_official 34:bb6061527455 132 return 1;
mbed_official 34:bb6061527455 133 }
mbed_official 34:bb6061527455 134 }
mbed_official 34:bb6061527455 135
bogdanm 0:9b334a45a8ff 136 // Generate the START condition
bogdanm 0:9b334a45a8ff 137 i2c->CR1 |= I2C_CR1_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_SB) == 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 {
bogdanm 0:9b334a45a8ff 152 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 153
bogdanm 0:9b334a45a8ff 154 // Generate the STOP condition
bogdanm 0:9b334a45a8ff 155 i2c->CR1 |= I2C_CR1_STOP;
bogdanm 0:9b334a45a8ff 156
bogdanm 0:9b334a45a8ff 157 return 0;
bogdanm 0:9b334a45a8ff 158 }
bogdanm 0:9b334a45a8ff 159
bogdanm 0:9b334a45a8ff 160 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
bogdanm 0:9b334a45a8ff 161 {
bogdanm 0:9b334a45a8ff 162 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 163 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 164 int timeout;
bogdanm 0:9b334a45a8ff 165 int count;
bogdanm 0:9b334a45a8ff 166 int value;
bogdanm 0:9b334a45a8ff 167
bogdanm 0:9b334a45a8ff 168 // Generate start condition
bogdanm 0:9b334a45a8ff 169 i2c_start(obj);
bogdanm 0:9b334a45a8ff 170
bogdanm 0:9b334a45a8ff 171 // Send address for read
bogdanm 0:9b334a45a8ff 172 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
bogdanm 0:9b334a45a8ff 173
bogdanm 0:9b334a45a8ff 174 // Wait address is acknowledged
bogdanm 0:9b334a45a8ff 175 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 176 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
bogdanm 0:9b334a45a8ff 177 timeout--;
bogdanm 0:9b334a45a8ff 178 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 179 return -1;
bogdanm 0:9b334a45a8ff 180 }
bogdanm 0:9b334a45a8ff 181 }
bogdanm 0:9b334a45a8ff 182 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
bogdanm 0:9b334a45a8ff 183
bogdanm 0:9b334a45a8ff 184 // Read all bytes except last one
bogdanm 0:9b334a45a8ff 185 for (count = 0; count < (length - 1); count++) {
bogdanm 0:9b334a45a8ff 186 value = i2c_byte_read(obj, 0);
bogdanm 0:9b334a45a8ff 187 data[count] = (char)value;
bogdanm 0:9b334a45a8ff 188 }
bogdanm 0:9b334a45a8ff 189
bogdanm 0:9b334a45a8ff 190 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 191 // Warning: must be done BEFORE the data is read.
bogdanm 0:9b334a45a8ff 192 if (stop) {
bogdanm 0:9b334a45a8ff 193 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 194 }
bogdanm 0:9b334a45a8ff 195
bogdanm 0:9b334a45a8ff 196 // Read the last byte
bogdanm 0:9b334a45a8ff 197 value = i2c_byte_read(obj, 1);
bogdanm 0:9b334a45a8ff 198 data[count] = (char)value;
bogdanm 0:9b334a45a8ff 199
bogdanm 0:9b334a45a8ff 200 return length;
bogdanm 0:9b334a45a8ff 201 }
bogdanm 0:9b334a45a8ff 202
bogdanm 0:9b334a45a8ff 203 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
bogdanm 0:9b334a45a8ff 204 {
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 // Generate start condition
bogdanm 0:9b334a45a8ff 211 i2c_start(obj);
bogdanm 0:9b334a45a8ff 212
bogdanm 0:9b334a45a8ff 213 // Send address for write
bogdanm 0:9b334a45a8ff 214 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
bogdanm 0:9b334a45a8ff 215
bogdanm 0:9b334a45a8ff 216 // Wait address is acknowledged
bogdanm 0:9b334a45a8ff 217 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 218 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
bogdanm 0:9b334a45a8ff 219 timeout--;
bogdanm 0:9b334a45a8ff 220 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 221 return -1;
bogdanm 0:9b334a45a8ff 222 }
bogdanm 0:9b334a45a8ff 223 }
bogdanm 0:9b334a45a8ff 224 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
bogdanm 0:9b334a45a8ff 225
bogdanm 0:9b334a45a8ff 226 // Write all bytes
bogdanm 0:9b334a45a8ff 227 for (count = 0; count < length; count++) {
bogdanm 0:9b334a45a8ff 228 if (i2c_byte_write(obj, data[count]) != 1) {
bogdanm 0:9b334a45a8ff 229 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 230 return -1;
bogdanm 0:9b334a45a8ff 231 }
bogdanm 0:9b334a45a8ff 232 }
bogdanm 0:9b334a45a8ff 233
bogdanm 0:9b334a45a8ff 234 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 235 if (stop) {
bogdanm 0:9b334a45a8ff 236 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 237 }
bogdanm 0:9b334a45a8ff 238
bogdanm 0:9b334a45a8ff 239 return count;
bogdanm 0:9b334a45a8ff 240 }
bogdanm 0:9b334a45a8ff 241
bogdanm 0:9b334a45a8ff 242 int i2c_byte_read(i2c_t *obj, int last)
bogdanm 0:9b334a45a8ff 243 {
bogdanm 0:9b334a45a8ff 244 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 245 int timeout;
bogdanm 0:9b334a45a8ff 246
bogdanm 0:9b334a45a8ff 247 if (last) {
bogdanm 0:9b334a45a8ff 248 // Don't acknowledge the last byte
bogdanm 0:9b334a45a8ff 249 i2c->CR1 &= ~I2C_CR1_ACK;
bogdanm 0:9b334a45a8ff 250 } else {
bogdanm 0:9b334a45a8ff 251 // Acknowledge the byte
bogdanm 0:9b334a45a8ff 252 i2c->CR1 |= I2C_CR1_ACK;
bogdanm 0:9b334a45a8ff 253 }
bogdanm 0:9b334a45a8ff 254
bogdanm 0:9b334a45a8ff 255 // Wait until the byte is received
bogdanm 0:9b334a45a8ff 256 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 257 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
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
bogdanm 0:9b334a45a8ff 263 return (int)i2c->DR;
bogdanm 0:9b334a45a8ff 264 }
bogdanm 0:9b334a45a8ff 265
bogdanm 0:9b334a45a8ff 266 int i2c_byte_write(i2c_t *obj, int data)
bogdanm 0:9b334a45a8ff 267 {
bogdanm 0:9b334a45a8ff 268 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 269 int timeout;
bogdanm 0:9b334a45a8ff 270
bogdanm 0:9b334a45a8ff 271 i2c->DR = (uint8_t)data;
bogdanm 0:9b334a45a8ff 272
bogdanm 0:9b334a45a8ff 273 // Wait until the byte is transmitted
bogdanm 0:9b334a45a8ff 274 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 275 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
bogdanm 0:9b334a45a8ff 276 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
bogdanm 0:9b334a45a8ff 277 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 278 return 0;
bogdanm 0:9b334a45a8ff 279 }
bogdanm 0:9b334a45a8ff 280 }
bogdanm 0:9b334a45a8ff 281
bogdanm 0:9b334a45a8ff 282 return 1;
bogdanm 0:9b334a45a8ff 283 }
bogdanm 0:9b334a45a8ff 284
bogdanm 0:9b334a45a8ff 285 void i2c_reset(i2c_t *obj)
bogdanm 0:9b334a45a8ff 286 {
bogdanm 0:9b334a45a8ff 287 int timeout;
bogdanm 0:9b334a45a8ff 288
bogdanm 0:9b334a45a8ff 289 // Wait before reset
bogdanm 0:9b334a45a8ff 290 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 291 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
bogdanm 0:9b334a45a8ff 292
bogdanm 0:9b334a45a8ff 293 if (obj->i2c == I2C_1) {
bogdanm 0:9b334a45a8ff 294 __I2C1_FORCE_RESET();
bogdanm 0:9b334a45a8ff 295 __I2C1_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 296 }
bogdanm 0:9b334a45a8ff 297
bogdanm 0:9b334a45a8ff 298 if (obj->i2c == I2C_2) {
bogdanm 0:9b334a45a8ff 299 __I2C2_FORCE_RESET();
bogdanm 0:9b334a45a8ff 300 __I2C2_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 301 }
bogdanm 0:9b334a45a8ff 302 }
bogdanm 0:9b334a45a8ff 303
bogdanm 0:9b334a45a8ff 304 #if DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 305
bogdanm 0:9b334a45a8ff 306 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
bogdanm 0:9b334a45a8ff 307 {
bogdanm 0:9b334a45a8ff 308 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 309 uint16_t tmpreg = 0;
bogdanm 0:9b334a45a8ff 310
bogdanm 0:9b334a45a8ff 311 // Get the old register value
bogdanm 0:9b334a45a8ff 312 tmpreg = i2c->OAR1;
bogdanm 0:9b334a45a8ff 313 // Reset address bits
bogdanm 0:9b334a45a8ff 314 tmpreg &= 0xFC00;
bogdanm 0:9b334a45a8ff 315 // Set new address
bogdanm 0:9b334a45a8ff 316 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
bogdanm 0:9b334a45a8ff 317 // Store the new register value
bogdanm 0:9b334a45a8ff 318 i2c->OAR1 = tmpreg;
bogdanm 0:9b334a45a8ff 319 }
bogdanm 0:9b334a45a8ff 320
bogdanm 0:9b334a45a8ff 321 void i2c_slave_mode(i2c_t *obj, int enable_slave)
bogdanm 0:9b334a45a8ff 322 {
bogdanm 0:9b334a45a8ff 323 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 324 if (enable_slave) {
bogdanm 0:9b334a45a8ff 325 obj->slave = 1;
bogdanm 0:9b334a45a8ff 326 /* Enable Address Acknowledge */
bogdanm 0:9b334a45a8ff 327 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
bogdanm 0:9b334a45a8ff 328 }
bogdanm 0:9b334a45a8ff 329 }
bogdanm 0:9b334a45a8ff 330
bogdanm 0:9b334a45a8ff 331 // See I2CSlave.h
bogdanm 0:9b334a45a8ff 332 #define NoData 0 // the slave has not been addressed
bogdanm 0:9b334a45a8ff 333 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
bogdanm 0:9b334a45a8ff 334 #define WriteGeneral 2 // the master is writing to all slave
bogdanm 0:9b334a45a8ff 335 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
bogdanm 0:9b334a45a8ff 336
bogdanm 0:9b334a45a8ff 337 int i2c_slave_receive(i2c_t *obj)
bogdanm 0:9b334a45a8ff 338 {
bogdanm 0:9b334a45a8ff 339 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 340 int retValue = NoData;
bogdanm 0:9b334a45a8ff 341
bogdanm 0:9b334a45a8ff 342 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
bogdanm 0:9b334a45a8ff 343 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
bogdanm 0:9b334a45a8ff 344 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1) {
bogdanm 0:9b334a45a8ff 345 retValue = ReadAddressed;
bogdanm 0:9b334a45a8ff 346 } else {
bogdanm 0:9b334a45a8ff 347 retValue = WriteAddressed;
bogdanm 0:9b334a45a8ff 348 }
bogdanm 0:9b334a45a8ff 349 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
bogdanm 0:9b334a45a8ff 350 }
bogdanm 0:9b334a45a8ff 351 }
bogdanm 0:9b334a45a8ff 352
bogdanm 0:9b334a45a8ff 353 return (retValue);
bogdanm 0:9b334a45a8ff 354 }
bogdanm 0:9b334a45a8ff 355
bogdanm 0:9b334a45a8ff 356 int i2c_slave_read(i2c_t *obj, char *data, int length)
bogdanm 0:9b334a45a8ff 357 {
bogdanm 0:9b334a45a8ff 358 uint32_t Timeout;
bogdanm 0:9b334a45a8ff 359 int size = 0;
bogdanm 0:9b334a45a8ff 360
bogdanm 0:9b334a45a8ff 361 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 362
bogdanm 0:9b334a45a8ff 363 while (length > 0) {
bogdanm 0:9b334a45a8ff 364 // Wait until RXNE flag is set
bogdanm 0:9b334a45a8ff 365 // Wait until the byte is received
bogdanm 0:9b334a45a8ff 366 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 367 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
bogdanm 0:9b334a45a8ff 368 Timeout--;
bogdanm 0:9b334a45a8ff 369 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 370 return -1;
bogdanm 0:9b334a45a8ff 371 }
bogdanm 0:9b334a45a8ff 372 }
bogdanm 0:9b334a45a8ff 373
bogdanm 0:9b334a45a8ff 374 // Read data
bogdanm 0:9b334a45a8ff 375 (*data++) = I2cHandle.Instance->DR;
bogdanm 0:9b334a45a8ff 376 length--;
bogdanm 0:9b334a45a8ff 377 size++;
bogdanm 0:9b334a45a8ff 378
bogdanm 0:9b334a45a8ff 379 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
bogdanm 0:9b334a45a8ff 380 // Read data
bogdanm 0:9b334a45a8ff 381 (*data++) = I2cHandle.Instance->DR;
bogdanm 0:9b334a45a8ff 382 length--;
bogdanm 0:9b334a45a8ff 383 size++;
bogdanm 0:9b334a45a8ff 384 }
bogdanm 0:9b334a45a8ff 385 }
bogdanm 0:9b334a45a8ff 386
bogdanm 0:9b334a45a8ff 387 // Wait until STOP flag is set
bogdanm 0:9b334a45a8ff 388 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 389 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
bogdanm 0:9b334a45a8ff 390 Timeout--;
bogdanm 0:9b334a45a8ff 391 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 392 return -1;
bogdanm 0:9b334a45a8ff 393 }
bogdanm 0:9b334a45a8ff 394 }
bogdanm 0:9b334a45a8ff 395
bogdanm 0:9b334a45a8ff 396 // Clear STOP flag
bogdanm 0:9b334a45a8ff 397 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
bogdanm 0:9b334a45a8ff 398
bogdanm 0:9b334a45a8ff 399 // Wait until BUSY flag is reset
bogdanm 0:9b334a45a8ff 400 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 401 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
bogdanm 0:9b334a45a8ff 402 Timeout--;
bogdanm 0:9b334a45a8ff 403 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 404 return -1;
bogdanm 0:9b334a45a8ff 405 }
bogdanm 0:9b334a45a8ff 406 }
bogdanm 0:9b334a45a8ff 407
bogdanm 0:9b334a45a8ff 408 return size;
bogdanm 0:9b334a45a8ff 409 }
bogdanm 0:9b334a45a8ff 410
bogdanm 0:9b334a45a8ff 411 int i2c_slave_write(i2c_t *obj, const char *data, int length)
bogdanm 0:9b334a45a8ff 412 {
bogdanm 0:9b334a45a8ff 413 uint32_t Timeout;
bogdanm 0:9b334a45a8ff 414 int size = 0;
bogdanm 0:9b334a45a8ff 415
bogdanm 0:9b334a45a8ff 416 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 417
bogdanm 0:9b334a45a8ff 418 while (length > 0) {
bogdanm 0:9b334a45a8ff 419 // Wait until TXE flag is set
bogdanm 0:9b334a45a8ff 420 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 421 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
bogdanm 0:9b334a45a8ff 422 Timeout--;
bogdanm 0:9b334a45a8ff 423 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 424 return -1;
bogdanm 0:9b334a45a8ff 425 }
bogdanm 0:9b334a45a8ff 426 }
bogdanm 0:9b334a45a8ff 427
bogdanm 0:9b334a45a8ff 428 // Write data
bogdanm 0:9b334a45a8ff 429 I2cHandle.Instance->DR = (*data++);
bogdanm 0:9b334a45a8ff 430 length--;
bogdanm 0:9b334a45a8ff 431 size++;
bogdanm 0:9b334a45a8ff 432
bogdanm 0:9b334a45a8ff 433 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
bogdanm 0:9b334a45a8ff 434 // Write data to DR
bogdanm 0:9b334a45a8ff 435 I2cHandle.Instance->DR = (*data++);
bogdanm 0:9b334a45a8ff 436 length--;
bogdanm 0:9b334a45a8ff 437 size++;
bogdanm 0:9b334a45a8ff 438 }
bogdanm 0:9b334a45a8ff 439 }
bogdanm 0:9b334a45a8ff 440
bogdanm 0:9b334a45a8ff 441 // Wait until AF flag is set
bogdanm 0:9b334a45a8ff 442 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 443 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
bogdanm 0:9b334a45a8ff 444 Timeout--;
bogdanm 0:9b334a45a8ff 445 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 446 return -1;
bogdanm 0:9b334a45a8ff 447 }
bogdanm 0:9b334a45a8ff 448 }
bogdanm 0:9b334a45a8ff 449
bogdanm 0:9b334a45a8ff 450 // Clear AF flag
bogdanm 0:9b334a45a8ff 451 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
bogdanm 0:9b334a45a8ff 452
bogdanm 0:9b334a45a8ff 453 // Wait until BUSY flag is reset
bogdanm 0:9b334a45a8ff 454 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 455 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
bogdanm 0:9b334a45a8ff 456 Timeout--;
bogdanm 0:9b334a45a8ff 457 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 458 return -1;
bogdanm 0:9b334a45a8ff 459 }
bogdanm 0:9b334a45a8ff 460 }
bogdanm 0:9b334a45a8ff 461
bogdanm 0:9b334a45a8ff 462 return size;
bogdanm 0:9b334a45a8ff 463 }
bogdanm 0:9b334a45a8ff 464
bogdanm 0:9b334a45a8ff 465
bogdanm 0:9b334a45a8ff 466 #endif // DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 467
bogdanm 0:9b334a45a8ff 468 #endif // DEVICE_I2C