Jolyon Hill / mbed-dev

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targets/hal/TARGET_STM/TARGET_STM32L1/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:
144:ef7eb2e8f9f7
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 int i2c1_inited = 0;
bogdanm 0:9b334a45a8ff 48 int i2c2_inited = 0;
bogdanm 0:9b334a45a8ff 49
bogdanm 0:9b334a45a8ff 50 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
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 // Enable I2C1 clock and pinout if not done
bogdanm 0:9b334a45a8ff 60 if ((obj->i2c == I2C_1) && !i2c1_inited) {
bogdanm 0:9b334a45a8ff 61 i2c1_inited = 1;
bogdanm 0:9b334a45a8ff 62 __I2C1_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 63 // Configure I2C pins
bogdanm 0:9b334a45a8ff 64 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 65 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 66 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 67 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 68 }
bogdanm 0:9b334a45a8ff 69 // Enable I2C2 clock and pinout if not done
bogdanm 0:9b334a45a8ff 70 if ((obj->i2c == I2C_2) && !i2c2_inited) {
bogdanm 0:9b334a45a8ff 71 i2c2_inited = 1;
bogdanm 0:9b334a45a8ff 72 __I2C2_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 73 // Configure I2C pins
bogdanm 0:9b334a45a8ff 74 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 75 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 76 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 77 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 78 }
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.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
bogdanm 0:9b334a45a8ff 102 I2cHandle.Init.ClockSpeed = hz;
bogdanm 0:9b334a45a8ff 103 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
bogdanm 0:9b334a45a8ff 104 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
bogdanm 0:9b334a45a8ff 105 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
bogdanm 0:9b334a45a8ff 106 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
bogdanm 0:9b334a45a8ff 107 I2cHandle.Init.OwnAddress1 = 0;
bogdanm 0:9b334a45a8ff 108 I2cHandle.Init.OwnAddress2 = 0;
bogdanm 0:9b334a45a8ff 109 HAL_I2C_Init(&I2cHandle);
bogdanm 0:9b334a45a8ff 110 if (obj->slave) {
bogdanm 0:9b334a45a8ff 111 /* Enable Address Acknowledge */
bogdanm 0:9b334a45a8ff 112 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
bogdanm 0:9b334a45a8ff 113 }
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 i2c_start(obj);
bogdanm 0:9b334a45a8ff 169
bogdanm 0:9b334a45a8ff 170 // Wait until SB flag is set
bogdanm 0:9b334a45a8ff 171 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 172 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
bogdanm 0:9b334a45a8ff 173 timeout--;
bogdanm 0:9b334a45a8ff 174 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 175 return -1;
bogdanm 0:9b334a45a8ff 176 }
bogdanm 0:9b334a45a8ff 177 }
bogdanm 0:9b334a45a8ff 178
bogdanm 0:9b334a45a8ff 179 i2c->DR = I2C_7BIT_ADD_READ(address);
bogdanm 0:9b334a45a8ff 180
bogdanm 0:9b334a45a8ff 181
bogdanm 0:9b334a45a8ff 182 // Wait address is acknowledged
bogdanm 0:9b334a45a8ff 183 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 184 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
bogdanm 0:9b334a45a8ff 185 timeout--;
bogdanm 0:9b334a45a8ff 186 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 187 return -1;
bogdanm 0:9b334a45a8ff 188 }
bogdanm 0:9b334a45a8ff 189 }
bogdanm 0:9b334a45a8ff 190 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
bogdanm 0:9b334a45a8ff 191
bogdanm 0:9b334a45a8ff 192 // Read all bytes except last one
bogdanm 0:9b334a45a8ff 193 for (count = 0; count < (length - 1); count++) {
bogdanm 0:9b334a45a8ff 194 value = i2c_byte_read(obj, 0);
bogdanm 0:9b334a45a8ff 195 data[count] = (char)value;
bogdanm 0:9b334a45a8ff 196 }
bogdanm 0:9b334a45a8ff 197
bogdanm 0:9b334a45a8ff 198 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 199 // Warning: must be done BEFORE the data is read.
bogdanm 0:9b334a45a8ff 200 if (stop) {
bogdanm 0:9b334a45a8ff 201 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 202 }
bogdanm 0:9b334a45a8ff 203
bogdanm 0:9b334a45a8ff 204 // Read the last byte
bogdanm 0:9b334a45a8ff 205 value = i2c_byte_read(obj, 1);
bogdanm 0:9b334a45a8ff 206 data[count] = (char)value;
bogdanm 0:9b334a45a8ff 207
bogdanm 0:9b334a45a8ff 208 return length;
bogdanm 0:9b334a45a8ff 209 }
bogdanm 0:9b334a45a8ff 210
bogdanm 0:9b334a45a8ff 211 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
bogdanm 0:9b334a45a8ff 212 {
bogdanm 0:9b334a45a8ff 213 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 214 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 215 int timeout;
bogdanm 0:9b334a45a8ff 216 int count;
bogdanm 0:9b334a45a8ff 217
bogdanm 0:9b334a45a8ff 218 i2c_start(obj);
bogdanm 0:9b334a45a8ff 219
bogdanm 0:9b334a45a8ff 220 // Wait until SB flag is set
bogdanm 0:9b334a45a8ff 221 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 222 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
bogdanm 0:9b334a45a8ff 223 timeout--;
bogdanm 0:9b334a45a8ff 224 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 225 return -1;
bogdanm 0:9b334a45a8ff 226 }
bogdanm 0:9b334a45a8ff 227 }
bogdanm 0:9b334a45a8ff 228
bogdanm 0:9b334a45a8ff 229 i2c->DR = I2C_7BIT_ADD_WRITE(address);
bogdanm 0:9b334a45a8ff 230
bogdanm 0:9b334a45a8ff 231
bogdanm 0:9b334a45a8ff 232 // Wait address is acknowledged
bogdanm 0:9b334a45a8ff 233 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 234 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
bogdanm 0:9b334a45a8ff 235 timeout--;
bogdanm 0:9b334a45a8ff 236 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 237 return -1;
bogdanm 0:9b334a45a8ff 238 }
bogdanm 0:9b334a45a8ff 239 }
bogdanm 0:9b334a45a8ff 240 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
bogdanm 0:9b334a45a8ff 241
bogdanm 0:9b334a45a8ff 242 for (count = 0; count < length; count++) {
bogdanm 0:9b334a45a8ff 243 if (i2c_byte_write(obj, data[count]) != 1) {
bogdanm 0:9b334a45a8ff 244 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 245 return -1;
bogdanm 0:9b334a45a8ff 246 }
bogdanm 0:9b334a45a8ff 247 }
bogdanm 0:9b334a45a8ff 248
bogdanm 0:9b334a45a8ff 249 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 250 if (stop) {
bogdanm 0:9b334a45a8ff 251 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 252 }
bogdanm 0:9b334a45a8ff 253
bogdanm 0:9b334a45a8ff 254 return count;
bogdanm 0:9b334a45a8ff 255 }
bogdanm 0:9b334a45a8ff 256
bogdanm 0:9b334a45a8ff 257 int i2c_byte_read(i2c_t *obj, int last)
bogdanm 0:9b334a45a8ff 258 {
bogdanm 0:9b334a45a8ff 259 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 260 int timeout;
bogdanm 0:9b334a45a8ff 261
bogdanm 0:9b334a45a8ff 262 if (last) {
bogdanm 0:9b334a45a8ff 263 // Don't acknowledge the last byte
bogdanm 0:9b334a45a8ff 264 i2c->CR1 &= ~I2C_CR1_ACK;
bogdanm 0:9b334a45a8ff 265 } else {
bogdanm 0:9b334a45a8ff 266 // Acknowledge the byte
bogdanm 0:9b334a45a8ff 267 i2c->CR1 |= I2C_CR1_ACK;
bogdanm 0:9b334a45a8ff 268 }
bogdanm 0:9b334a45a8ff 269
bogdanm 0:9b334a45a8ff 270 // Wait until the byte is received
bogdanm 0:9b334a45a8ff 271 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 272 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
bogdanm 0:9b334a45a8ff 273 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 274 return -1;
bogdanm 0:9b334a45a8ff 275 }
bogdanm 0:9b334a45a8ff 276 }
bogdanm 0:9b334a45a8ff 277
bogdanm 0:9b334a45a8ff 278 return (int)i2c->DR;
bogdanm 0:9b334a45a8ff 279 }
bogdanm 0:9b334a45a8ff 280
bogdanm 0:9b334a45a8ff 281 int i2c_byte_write(i2c_t *obj, int data)
bogdanm 0:9b334a45a8ff 282 {
bogdanm 0:9b334a45a8ff 283 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 284 int timeout;
bogdanm 0:9b334a45a8ff 285
bogdanm 0:9b334a45a8ff 286 i2c->DR = (uint8_t)data;
bogdanm 0:9b334a45a8ff 287
bogdanm 0:9b334a45a8ff 288 // Wait until the byte is transmitted
bogdanm 0:9b334a45a8ff 289 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 290 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
bogdanm 0:9b334a45a8ff 291 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
bogdanm 0:9b334a45a8ff 292 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 293 return 0;
bogdanm 0:9b334a45a8ff 294 }
bogdanm 0:9b334a45a8ff 295 }
bogdanm 0:9b334a45a8ff 296
bogdanm 0:9b334a45a8ff 297 return 1;
bogdanm 0:9b334a45a8ff 298 }
bogdanm 0:9b334a45a8ff 299
bogdanm 0:9b334a45a8ff 300 void i2c_reset(i2c_t *obj)
bogdanm 0:9b334a45a8ff 301 {
bogdanm 0:9b334a45a8ff 302 int timeout;
bogdanm 0:9b334a45a8ff 303
bogdanm 0:9b334a45a8ff 304 // wait before reset
bogdanm 0:9b334a45a8ff 305 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 306 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
bogdanm 0:9b334a45a8ff 307
bogdanm 0:9b334a45a8ff 308 if (obj->i2c == I2C_1) {
bogdanm 0:9b334a45a8ff 309 __I2C1_FORCE_RESET();
bogdanm 0:9b334a45a8ff 310 __I2C1_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 311 }
bogdanm 0:9b334a45a8ff 312 if (obj->i2c == I2C_2) {
bogdanm 0:9b334a45a8ff 313 __I2C2_FORCE_RESET();
bogdanm 0:9b334a45a8ff 314 __I2C2_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 315 }
bogdanm 0:9b334a45a8ff 316 }
bogdanm 0:9b334a45a8ff 317
bogdanm 0:9b334a45a8ff 318 #if DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 319
bogdanm 0:9b334a45a8ff 320 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
bogdanm 0:9b334a45a8ff 321 {
bogdanm 0:9b334a45a8ff 322 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 323 uint16_t tmpreg = 0;
bogdanm 0:9b334a45a8ff 324
bogdanm 0:9b334a45a8ff 325 // Get the old register value
bogdanm 0:9b334a45a8ff 326 tmpreg = i2c->OAR1;
bogdanm 0:9b334a45a8ff 327 // Reset address bits
bogdanm 0:9b334a45a8ff 328 tmpreg &= 0xFC00;
bogdanm 0:9b334a45a8ff 329 // Set new address
bogdanm 0:9b334a45a8ff 330 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
bogdanm 0:9b334a45a8ff 331 // Store the new register value
bogdanm 0:9b334a45a8ff 332 i2c->OAR1 = tmpreg;
bogdanm 0:9b334a45a8ff 333 }
bogdanm 0:9b334a45a8ff 334
bogdanm 0:9b334a45a8ff 335 void i2c_slave_mode(i2c_t *obj, int enable_slave)
bogdanm 0:9b334a45a8ff 336 {
bogdanm 0:9b334a45a8ff 337 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 338 if (enable_slave) {
bogdanm 0:9b334a45a8ff 339 obj->slave = 1;
bogdanm 0:9b334a45a8ff 340 /* Enable Address Acknowledge */
bogdanm 0:9b334a45a8ff 341 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
bogdanm 0:9b334a45a8ff 342 }
bogdanm 0:9b334a45a8ff 343 }
bogdanm 0:9b334a45a8ff 344
bogdanm 0:9b334a45a8ff 345 // See I2CSlave.h
bogdanm 0:9b334a45a8ff 346 #define NoData 0 // the slave has not been addressed
bogdanm 0:9b334a45a8ff 347 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
bogdanm 0:9b334a45a8ff 348 #define WriteGeneral 2 // the master is writing to all slave
bogdanm 0:9b334a45a8ff 349 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
bogdanm 0:9b334a45a8ff 350
bogdanm 0:9b334a45a8ff 351 int i2c_slave_receive(i2c_t *obj)
bogdanm 0:9b334a45a8ff 352 {
bogdanm 0:9b334a45a8ff 353 int retValue = NoData;
bogdanm 0:9b334a45a8ff 354
bogdanm 0:9b334a45a8ff 355 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
bogdanm 0:9b334a45a8ff 356 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
bogdanm 0:9b334a45a8ff 357 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1)
bogdanm 0:9b334a45a8ff 358 retValue = ReadAddressed;
bogdanm 0:9b334a45a8ff 359 else
bogdanm 0:9b334a45a8ff 360 retValue = WriteAddressed;
bogdanm 0:9b334a45a8ff 361
bogdanm 0:9b334a45a8ff 362 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
bogdanm 0:9b334a45a8ff 363 }
bogdanm 0:9b334a45a8ff 364 }
bogdanm 0:9b334a45a8ff 365
bogdanm 0:9b334a45a8ff 366 return (retValue);
bogdanm 0:9b334a45a8ff 367 }
bogdanm 0:9b334a45a8ff 368
bogdanm 0:9b334a45a8ff 369 int i2c_slave_read(i2c_t *obj, char *data, int length)
bogdanm 0:9b334a45a8ff 370 {
bogdanm 0:9b334a45a8ff 371 uint32_t Timeout;
bogdanm 0:9b334a45a8ff 372 int size = 0;
bogdanm 0:9b334a45a8ff 373
bogdanm 0:9b334a45a8ff 374 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 375
bogdanm 0:9b334a45a8ff 376 while (length > 0) {
bogdanm 0:9b334a45a8ff 377 /* Wait until RXNE flag is set */
bogdanm 0:9b334a45a8ff 378 // Wait until the byte is received
bogdanm 0:9b334a45a8ff 379 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 380 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
bogdanm 0:9b334a45a8ff 381 Timeout--;
bogdanm 0:9b334a45a8ff 382 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 383 return -1;
bogdanm 0:9b334a45a8ff 384 }
bogdanm 0:9b334a45a8ff 385 }
bogdanm 0:9b334a45a8ff 386
bogdanm 0:9b334a45a8ff 387 /* Read data from DR */
bogdanm 0:9b334a45a8ff 388 (*data++) = I2cHandle.Instance->DR;
bogdanm 0:9b334a45a8ff 389 length--;
bogdanm 0:9b334a45a8ff 390 size++;
bogdanm 0:9b334a45a8ff 391
bogdanm 0:9b334a45a8ff 392 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
bogdanm 0:9b334a45a8ff 393 /* Read data from DR */
bogdanm 0:9b334a45a8ff 394 (*data++) = I2cHandle.Instance->DR;
bogdanm 0:9b334a45a8ff 395 length--;
bogdanm 0:9b334a45a8ff 396 size++;
bogdanm 0:9b334a45a8ff 397 }
bogdanm 0:9b334a45a8ff 398 }
bogdanm 0:9b334a45a8ff 399
bogdanm 0:9b334a45a8ff 400 /* Wait until STOP flag is set */
bogdanm 0:9b334a45a8ff 401 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 402 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
bogdanm 0:9b334a45a8ff 403 Timeout--;
bogdanm 0:9b334a45a8ff 404 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 405 return -1;
bogdanm 0:9b334a45a8ff 406 }
bogdanm 0:9b334a45a8ff 407 }
bogdanm 0:9b334a45a8ff 408
bogdanm 0:9b334a45a8ff 409 /* Clear STOP flag */
bogdanm 0:9b334a45a8ff 410 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
bogdanm 0:9b334a45a8ff 411
bogdanm 0:9b334a45a8ff 412 /* Wait until BUSY flag is reset */
bogdanm 0:9b334a45a8ff 413 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 414 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
bogdanm 0:9b334a45a8ff 415 Timeout--;
bogdanm 0:9b334a45a8ff 416 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 417 return -1;
bogdanm 0:9b334a45a8ff 418 }
bogdanm 0:9b334a45a8ff 419 }
bogdanm 0:9b334a45a8ff 420
bogdanm 0:9b334a45a8ff 421 return size;
bogdanm 0:9b334a45a8ff 422 }
bogdanm 0:9b334a45a8ff 423
bogdanm 0:9b334a45a8ff 424 int i2c_slave_write(i2c_t *obj, const char *data, int length)
bogdanm 0:9b334a45a8ff 425 {
bogdanm 0:9b334a45a8ff 426 uint32_t Timeout;
bogdanm 0:9b334a45a8ff 427 int size = 0;
bogdanm 0:9b334a45a8ff 428
bogdanm 0:9b334a45a8ff 429 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 430
bogdanm 0:9b334a45a8ff 431 while (length > 0) {
bogdanm 0:9b334a45a8ff 432 /* Wait until TXE flag is set */
bogdanm 0:9b334a45a8ff 433 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 434 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
bogdanm 0:9b334a45a8ff 435 Timeout--;
bogdanm 0:9b334a45a8ff 436 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 437 return -1;
bogdanm 0:9b334a45a8ff 438 }
bogdanm 0:9b334a45a8ff 439 }
bogdanm 0:9b334a45a8ff 440
bogdanm 0:9b334a45a8ff 441
bogdanm 0:9b334a45a8ff 442 /* Write data to DR */
bogdanm 0:9b334a45a8ff 443 I2cHandle.Instance->DR = (*data++);
bogdanm 0:9b334a45a8ff 444 length--;
bogdanm 0:9b334a45a8ff 445 size++;
bogdanm 0:9b334a45a8ff 446
bogdanm 0:9b334a45a8ff 447 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
bogdanm 0:9b334a45a8ff 448 /* Write data to DR */
bogdanm 0:9b334a45a8ff 449 I2cHandle.Instance->DR = (*data++);
bogdanm 0:9b334a45a8ff 450 length--;
bogdanm 0:9b334a45a8ff 451 size++;
bogdanm 0:9b334a45a8ff 452 }
bogdanm 0:9b334a45a8ff 453 }
bogdanm 0:9b334a45a8ff 454
bogdanm 0:9b334a45a8ff 455 /* Wait until AF flag is set */
bogdanm 0:9b334a45a8ff 456 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 457 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
bogdanm 0:9b334a45a8ff 458 Timeout--;
bogdanm 0:9b334a45a8ff 459 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 460 return -1;
bogdanm 0:9b334a45a8ff 461 }
bogdanm 0:9b334a45a8ff 462 }
bogdanm 0:9b334a45a8ff 463
bogdanm 0:9b334a45a8ff 464
bogdanm 0:9b334a45a8ff 465 /* Clear AF flag */
bogdanm 0:9b334a45a8ff 466 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
bogdanm 0:9b334a45a8ff 467
bogdanm 0:9b334a45a8ff 468
bogdanm 0:9b334a45a8ff 469 /* Wait until BUSY flag is reset */
bogdanm 0:9b334a45a8ff 470 Timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 471 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
bogdanm 0:9b334a45a8ff 472 Timeout--;
bogdanm 0:9b334a45a8ff 473 if (Timeout == 0) {
bogdanm 0:9b334a45a8ff 474 return -1;
bogdanm 0:9b334a45a8ff 475 }
bogdanm 0:9b334a45a8ff 476 }
bogdanm 0:9b334a45a8ff 477
bogdanm 0:9b334a45a8ff 478 I2cHandle.State = HAL_I2C_STATE_READY;
bogdanm 0:9b334a45a8ff 479
bogdanm 0:9b334a45a8ff 480 /* Process Unlocked */
bogdanm 0:9b334a45a8ff 481 __HAL_UNLOCK(&I2cHandle);
bogdanm 0:9b334a45a8ff 482
bogdanm 0:9b334a45a8ff 483 return size;
bogdanm 0:9b334a45a8ff 484 }
bogdanm 0:9b334a45a8ff 485
bogdanm 0:9b334a45a8ff 486
bogdanm 0:9b334a45a8ff 487 #endif // DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 488
bogdanm 0:9b334a45a8ff 489 #endif // DEVICE_I2C