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targets/TARGET_STM/TARGET_STM32L1/i2c_api.c@149:156823d33999, 2016-10-28 (annotated)

Committer:
<>
Date:
Fri Oct 28 11:17:30 2016 +0100
Revision:
149:156823d33999
Parent:
targets/hal/TARGET_STM/TARGET_STM32L1/i2c_api.c@144:ef7eb2e8f9f7 
This updates the lib to the mbed lib v128



NOTE: This release includes a restructuring of the file and directory locations and thus some

include paths in your code may need updating accordingly.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 *******************************************************************************
<> 144:ef7eb2e8f9f7 3 * Copyright (c) 2014, STMicroelectronics
<> 144:ef7eb2e8f9f7 4 * All rights reserved.
<> 144:ef7eb2e8f9f7 5 *
<> 144:ef7eb2e8f9f7 6 * Redistribution and use in source and binary forms, with or without
<> 144:ef7eb2e8f9f7 7 * modification, are permitted provided that the following conditions are met:
<> 144:ef7eb2e8f9f7 8 *
<> 144:ef7eb2e8f9f7 9 * 1. Redistributions of source code must retain the above copyright notice,
<> 144:ef7eb2e8f9f7 10 * this list of conditions and the following disclaimer.
<> 144:ef7eb2e8f9f7 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 144:ef7eb2e8f9f7 12 * this list of conditions and the following disclaimer in the documentation
<> 144:ef7eb2e8f9f7 13 * and/or other materials provided with the distribution.
<> 144:ef7eb2e8f9f7 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 144:ef7eb2e8f9f7 15 * may be used to endorse or promote products derived from this software
<> 144:ef7eb2e8f9f7 16 * without specific prior written permission.
<> 144:ef7eb2e8f9f7 17 *
<> 144:ef7eb2e8f9f7 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 144:ef7eb2e8f9f7 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 144:ef7eb2e8f9f7 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 144:ef7eb2e8f9f7 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 144:ef7eb2e8f9f7 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 144:ef7eb2e8f9f7 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 144:ef7eb2e8f9f7 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 144:ef7eb2e8f9f7 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 144:ef7eb2e8f9f7 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 144:ef7eb2e8f9f7 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 144:ef7eb2e8f9f7 28 *******************************************************************************
<> 144:ef7eb2e8f9f7 29 */
<> 144:ef7eb2e8f9f7 30 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 31 #include "i2c_api.h"
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 #if DEVICE_I2C
<> 144:ef7eb2e8f9f7 34
<> 144:ef7eb2e8f9f7 35 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 36 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 37 #include "PeripheralPins.h"
<> 144:ef7eb2e8f9f7 38
<> 144:ef7eb2e8f9f7 39 /* Timeout values for flags and events waiting loops. These timeouts are
<> 144:ef7eb2e8f9f7 40 not based on accurate values, they just guarantee that the application will
<> 144:ef7eb2e8f9f7 41 not remain stuck if the I2C communication is corrupted. */
<> 144:ef7eb2e8f9f7 42 #define FLAG_TIMEOUT ((int)0x1000)
<> 144:ef7eb2e8f9f7 43 #define LONG_TIMEOUT ((int)0x8000)
<> 144:ef7eb2e8f9f7 44
<> 144:ef7eb2e8f9f7 45 I2C_HandleTypeDef I2cHandle;
<> 144:ef7eb2e8f9f7 46
<> 144:ef7eb2e8f9f7 47 int i2c1_inited = 0;
<> 144:ef7eb2e8f9f7 48 int i2c2_inited = 0;
<> 144:ef7eb2e8f9f7 49
<> 144:ef7eb2e8f9f7 50 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
<> 144:ef7eb2e8f9f7 51 {
<> 144:ef7eb2e8f9f7 52 // Determine the I2C to use
<> 144:ef7eb2e8f9f7 53 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
<> 144:ef7eb2e8f9f7 54 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
<> 144:ef7eb2e8f9f7 55
<> 144:ef7eb2e8f9f7 56 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
<> 144:ef7eb2e8f9f7 57 MBED_ASSERT(obj->i2c != (I2CName)NC);
<> 144:ef7eb2e8f9f7 58
<> 144:ef7eb2e8f9f7 59 // Enable I2C1 clock and pinout if not done
<> 144:ef7eb2e8f9f7 60 if ((obj->i2c == I2C_1) && !i2c1_inited) {
<> 144:ef7eb2e8f9f7 61 i2c1_inited = 1;
<> 144:ef7eb2e8f9f7 62 __I2C1_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 63 // Configure I2C pins
<> 144:ef7eb2e8f9f7 64 pinmap_pinout(sda, PinMap_I2C_SDA);
<> 144:ef7eb2e8f9f7 65 pinmap_pinout(scl, PinMap_I2C_SCL);
<> 144:ef7eb2e8f9f7 66 pin_mode(sda, OpenDrain);
<> 144:ef7eb2e8f9f7 67 pin_mode(scl, OpenDrain);
<> 144:ef7eb2e8f9f7 68 }
<> 144:ef7eb2e8f9f7 69 // Enable I2C2 clock and pinout if not done
<> 144:ef7eb2e8f9f7 70 if ((obj->i2c == I2C_2) && !i2c2_inited) {
<> 144:ef7eb2e8f9f7 71 i2c2_inited = 1;
<> 144:ef7eb2e8f9f7 72 __I2C2_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 73 // Configure I2C pins
<> 144:ef7eb2e8f9f7 74 pinmap_pinout(sda, PinMap_I2C_SDA);
<> 144:ef7eb2e8f9f7 75 pinmap_pinout(scl, PinMap_I2C_SCL);
<> 144:ef7eb2e8f9f7 76 pin_mode(sda, OpenDrain);
<> 144:ef7eb2e8f9f7 77 pin_mode(scl, OpenDrain);
<> 144:ef7eb2e8f9f7 78 }
<> 144:ef7eb2e8f9f7 79
<> 144:ef7eb2e8f9f7 80 // Reset to clear pending flags if any
<> 144:ef7eb2e8f9f7 81 i2c_reset(obj);
<> 144:ef7eb2e8f9f7 82
<> 144:ef7eb2e8f9f7 83 // I2C configuration
<> 144:ef7eb2e8f9f7 84 i2c_frequency(obj, 100000); // 100 kHz per default
<> 144:ef7eb2e8f9f7 85
<> 144:ef7eb2e8f9f7 86 // I2C master by default
<> 144:ef7eb2e8f9f7 87 obj->slave = 0;
<> 144:ef7eb2e8f9f7 88 }
<> 144:ef7eb2e8f9f7 89
<> 144:ef7eb2e8f9f7 90 void i2c_frequency(i2c_t *obj, int hz)
<> 144:ef7eb2e8f9f7 91 {
<> 144:ef7eb2e8f9f7 92 MBED_ASSERT((hz != 0) && (hz <= 400000));
<> 144:ef7eb2e8f9f7 93 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 94 int timeout;
<> 144:ef7eb2e8f9f7 95
<> 144:ef7eb2e8f9f7 96 // wait before init
<> 144:ef7eb2e8f9f7 97 timeout = LONG_TIMEOUT;
<> 144:ef7eb2e8f9f7 98 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
<> 144:ef7eb2e8f9f7 99
<> 144:ef7eb2e8f9f7 100 // I2C configuration
<> 144:ef7eb2e8f9f7 101 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
<> 144:ef7eb2e8f9f7 102 I2cHandle.Init.ClockSpeed = hz;
<> 144:ef7eb2e8f9f7 103 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
<> 144:ef7eb2e8f9f7 104 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
<> 144:ef7eb2e8f9f7 105 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
<> 144:ef7eb2e8f9f7 106 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
<> 144:ef7eb2e8f9f7 107 I2cHandle.Init.OwnAddress1 = 0;
<> 144:ef7eb2e8f9f7 108 I2cHandle.Init.OwnAddress2 = 0;
<> 144:ef7eb2e8f9f7 109 HAL_I2C_Init(&I2cHandle);
<> 144:ef7eb2e8f9f7 110 if (obj->slave) {
<> 144:ef7eb2e8f9f7 111 /* Enable Address Acknowledge */
<> 144:ef7eb2e8f9f7 112 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
<> 144:ef7eb2e8f9f7 113 }
<> 144:ef7eb2e8f9f7 114
<> 144:ef7eb2e8f9f7 115 }
<> 144:ef7eb2e8f9f7 116
<> 144:ef7eb2e8f9f7 117 inline int i2c_start(i2c_t *obj)
<> 144:ef7eb2e8f9f7 118 {
<> 144:ef7eb2e8f9f7 119 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 120 int timeout;
<> 144:ef7eb2e8f9f7 121
<> 144:ef7eb2e8f9f7 122 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 123
<> 144:ef7eb2e8f9f7 124 // Clear Acknowledge failure flag
<> 144:ef7eb2e8f9f7 125 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
<> 144:ef7eb2e8f9f7 126
<> 144:ef7eb2e8f9f7 127 // Wait the STOP condition has been previously correctly sent
<> 144:ef7eb2e8f9f7 128 // This timeout can be avoid in some specific cases by simply clearing the STOP bit
<> 144:ef7eb2e8f9f7 129 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 130 while ((i2c->CR1 & I2C_CR1_STOP) == I2C_CR1_STOP) {
<> 144:ef7eb2e8f9f7 131 if ((timeout--) == 0) {
<> 144:ef7eb2e8f9f7 132 return 1;
<> 144:ef7eb2e8f9f7 133 }
<> 144:ef7eb2e8f9f7 134 }
<> 144:ef7eb2e8f9f7 135
<> 144:ef7eb2e8f9f7 136 // Generate the START condition
<> 144:ef7eb2e8f9f7 137 i2c->CR1 |= I2C_CR1_START;
<> 144:ef7eb2e8f9f7 138
<> 144:ef7eb2e8f9f7 139 // Wait the START condition has been correctly sent
<> 144:ef7eb2e8f9f7 140 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 141 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
<> 144:ef7eb2e8f9f7 142 if ((timeout--) == 0) {
<> 144:ef7eb2e8f9f7 143 return 1;
<> 144:ef7eb2e8f9f7 144 }
<> 144:ef7eb2e8f9f7 145 }
<> 144:ef7eb2e8f9f7 146
<> 144:ef7eb2e8f9f7 147 return 0;
<> 144:ef7eb2e8f9f7 148 }
<> 144:ef7eb2e8f9f7 149
<> 144:ef7eb2e8f9f7 150 inline int i2c_stop(i2c_t *obj)
<> 144:ef7eb2e8f9f7 151 {
<> 144:ef7eb2e8f9f7 152 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 153
<> 144:ef7eb2e8f9f7 154 // Generate the STOP condition
<> 144:ef7eb2e8f9f7 155 i2c->CR1 |= I2C_CR1_STOP;
<> 144:ef7eb2e8f9f7 156
<> 144:ef7eb2e8f9f7 157 return 0;
<> 144:ef7eb2e8f9f7 158 }
<> 144:ef7eb2e8f9f7 159
<> 144:ef7eb2e8f9f7 160 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
<> 144:ef7eb2e8f9f7 161 {
<> 144:ef7eb2e8f9f7 162 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 163 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 164 int timeout;
<> 144:ef7eb2e8f9f7 165 int count;
<> 144:ef7eb2e8f9f7 166 int value;
<> 144:ef7eb2e8f9f7 167
<> 144:ef7eb2e8f9f7 168 i2c_start(obj);
<> 144:ef7eb2e8f9f7 169
<> 144:ef7eb2e8f9f7 170 // Wait until SB flag is set
<> 144:ef7eb2e8f9f7 171 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 172 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
<> 144:ef7eb2e8f9f7 173 timeout--;
<> 144:ef7eb2e8f9f7 174 if (timeout == 0) {
<> 144:ef7eb2e8f9f7 175 return -1;
<> 144:ef7eb2e8f9f7 176 }
<> 144:ef7eb2e8f9f7 177 }
<> 144:ef7eb2e8f9f7 178
<> 144:ef7eb2e8f9f7 179 i2c->DR = I2C_7BIT_ADD_READ(address);
<> 144:ef7eb2e8f9f7 180
<> 144:ef7eb2e8f9f7 181
<> 144:ef7eb2e8f9f7 182 // Wait address is acknowledged
<> 144:ef7eb2e8f9f7 183 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 184 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
<> 144:ef7eb2e8f9f7 185 timeout--;
<> 144:ef7eb2e8f9f7 186 if (timeout == 0) {
<> 144:ef7eb2e8f9f7 187 return -1;
<> 144:ef7eb2e8f9f7 188 }
<> 144:ef7eb2e8f9f7 189 }
<> 144:ef7eb2e8f9f7 190 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
<> 144:ef7eb2e8f9f7 191
<> 144:ef7eb2e8f9f7 192 // Read all bytes except last one
<> 144:ef7eb2e8f9f7 193 for (count = 0; count < (length - 1); count++) {
<> 144:ef7eb2e8f9f7 194 value = i2c_byte_read(obj, 0);
<> 144:ef7eb2e8f9f7 195 data[count] = (char)value;
<> 144:ef7eb2e8f9f7 196 }
<> 144:ef7eb2e8f9f7 197
<> 144:ef7eb2e8f9f7 198 // If not repeated start, send stop.
<> 144:ef7eb2e8f9f7 199 // Warning: must be done BEFORE the data is read.
<> 144:ef7eb2e8f9f7 200 if (stop) {
<> 144:ef7eb2e8f9f7 201 i2c_stop(obj);
<> 144:ef7eb2e8f9f7 202 }
<> 144:ef7eb2e8f9f7 203
<> 144:ef7eb2e8f9f7 204 // Read the last byte
<> 144:ef7eb2e8f9f7 205 value = i2c_byte_read(obj, 1);
<> 144:ef7eb2e8f9f7 206 data[count] = (char)value;
<> 144:ef7eb2e8f9f7 207
<> 144:ef7eb2e8f9f7 208 return length;
<> 144:ef7eb2e8f9f7 209 }
<> 144:ef7eb2e8f9f7 210
<> 144:ef7eb2e8f9f7 211 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
<> 144:ef7eb2e8f9f7 212 {
<> 144:ef7eb2e8f9f7 213 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 214 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 215 int timeout;
<> 144:ef7eb2e8f9f7 216 int count;
<> 144:ef7eb2e8f9f7 217
<> 144:ef7eb2e8f9f7 218 i2c_start(obj);
<> 144:ef7eb2e8f9f7 219
<> 144:ef7eb2e8f9f7 220 // Wait until SB flag is set
<> 144:ef7eb2e8f9f7 221 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 222 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
<> 144:ef7eb2e8f9f7 223 timeout--;
<> 144:ef7eb2e8f9f7 224 if (timeout == 0) {
<> 144:ef7eb2e8f9f7 225 return -1;
<> 144:ef7eb2e8f9f7 226 }
<> 144:ef7eb2e8f9f7 227 }
<> 144:ef7eb2e8f9f7 228
<> 144:ef7eb2e8f9f7 229 i2c->DR = I2C_7BIT_ADD_WRITE(address);
<> 144:ef7eb2e8f9f7 230
<> 144:ef7eb2e8f9f7 231
<> 144:ef7eb2e8f9f7 232 // Wait address is acknowledged
<> 144:ef7eb2e8f9f7 233 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 234 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
<> 144:ef7eb2e8f9f7 235 timeout--;
<> 144:ef7eb2e8f9f7 236 if (timeout == 0) {
<> 144:ef7eb2e8f9f7 237 return -1;
<> 144:ef7eb2e8f9f7 238 }
<> 144:ef7eb2e8f9f7 239 }
<> 144:ef7eb2e8f9f7 240 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
<> 144:ef7eb2e8f9f7 241
<> 144:ef7eb2e8f9f7 242 for (count = 0; count < length; count++) {
<> 144:ef7eb2e8f9f7 243 if (i2c_byte_write(obj, data[count]) != 1) {
<> 144:ef7eb2e8f9f7 244 i2c_stop(obj);
<> 144:ef7eb2e8f9f7 245 return -1;
<> 144:ef7eb2e8f9f7 246 }
<> 144:ef7eb2e8f9f7 247 }
<> 144:ef7eb2e8f9f7 248
<> 144:ef7eb2e8f9f7 249 // If not repeated start, send stop.
<> 144:ef7eb2e8f9f7 250 if (stop) {
<> 144:ef7eb2e8f9f7 251 i2c_stop(obj);
<> 144:ef7eb2e8f9f7 252 }
<> 144:ef7eb2e8f9f7 253
<> 144:ef7eb2e8f9f7 254 return count;
<> 144:ef7eb2e8f9f7 255 }
<> 144:ef7eb2e8f9f7 256
<> 144:ef7eb2e8f9f7 257 int i2c_byte_read(i2c_t *obj, int last)
<> 144:ef7eb2e8f9f7 258 {
<> 144:ef7eb2e8f9f7 259 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 260 int timeout;
<> 144:ef7eb2e8f9f7 261
<> 144:ef7eb2e8f9f7 262 if (last) {
<> 144:ef7eb2e8f9f7 263 // Don't acknowledge the last byte
<> 144:ef7eb2e8f9f7 264 i2c->CR1 &= ~I2C_CR1_ACK;
<> 144:ef7eb2e8f9f7 265 } else {
<> 144:ef7eb2e8f9f7 266 // Acknowledge the byte
<> 144:ef7eb2e8f9f7 267 i2c->CR1 |= I2C_CR1_ACK;
<> 144:ef7eb2e8f9f7 268 }
<> 144:ef7eb2e8f9f7 269
<> 144:ef7eb2e8f9f7 270 // Wait until the byte is received
<> 144:ef7eb2e8f9f7 271 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 272 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
<> 144:ef7eb2e8f9f7 273 if ((timeout--) == 0) {
<> 144:ef7eb2e8f9f7 274 return -1;
<> 144:ef7eb2e8f9f7 275 }
<> 144:ef7eb2e8f9f7 276 }
<> 144:ef7eb2e8f9f7 277
<> 144:ef7eb2e8f9f7 278 return (int)i2c->DR;
<> 144:ef7eb2e8f9f7 279 }
<> 144:ef7eb2e8f9f7 280
<> 144:ef7eb2e8f9f7 281 int i2c_byte_write(i2c_t *obj, int data)
<> 144:ef7eb2e8f9f7 282 {
<> 144:ef7eb2e8f9f7 283 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 284 int timeout;
<> 144:ef7eb2e8f9f7 285
<> 144:ef7eb2e8f9f7 286 i2c->DR = (uint8_t)data;
<> 144:ef7eb2e8f9f7 287
<> 144:ef7eb2e8f9f7 288 // Wait until the byte is transmitted
<> 144:ef7eb2e8f9f7 289 timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 290 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
<> 144:ef7eb2e8f9f7 291 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
<> 144:ef7eb2e8f9f7 292 if ((timeout--) == 0) {
<> 144:ef7eb2e8f9f7 293 return 0;
<> 144:ef7eb2e8f9f7 294 }
<> 144:ef7eb2e8f9f7 295 }
<> 144:ef7eb2e8f9f7 296
<> 144:ef7eb2e8f9f7 297 return 1;
<> 144:ef7eb2e8f9f7 298 }
<> 144:ef7eb2e8f9f7 299
<> 144:ef7eb2e8f9f7 300 void i2c_reset(i2c_t *obj)
<> 144:ef7eb2e8f9f7 301 {
<> 144:ef7eb2e8f9f7 302 int timeout;
<> 144:ef7eb2e8f9f7 303
<> 144:ef7eb2e8f9f7 304 // wait before reset
<> 144:ef7eb2e8f9f7 305 timeout = LONG_TIMEOUT;
<> 144:ef7eb2e8f9f7 306 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
<> 144:ef7eb2e8f9f7 307
<> 144:ef7eb2e8f9f7 308 if (obj->i2c == I2C_1) {
<> 144:ef7eb2e8f9f7 309 __I2C1_FORCE_RESET();
<> 144:ef7eb2e8f9f7 310 __I2C1_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 311 }
<> 144:ef7eb2e8f9f7 312 if (obj->i2c == I2C_2) {
<> 144:ef7eb2e8f9f7 313 __I2C2_FORCE_RESET();
<> 144:ef7eb2e8f9f7 314 __I2C2_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 315 }
<> 144:ef7eb2e8f9f7 316 }
<> 144:ef7eb2e8f9f7 317
<> 144:ef7eb2e8f9f7 318 #if DEVICE_I2CSLAVE
<> 144:ef7eb2e8f9f7 319
<> 144:ef7eb2e8f9f7 320 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
<> 144:ef7eb2e8f9f7 321 {
<> 144:ef7eb2e8f9f7 322 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 323 uint16_t tmpreg = 0;
<> 144:ef7eb2e8f9f7 324
<> 144:ef7eb2e8f9f7 325 // Get the old register value
<> 144:ef7eb2e8f9f7 326 tmpreg = i2c->OAR1;
<> 144:ef7eb2e8f9f7 327 // Reset address bits
<> 144:ef7eb2e8f9f7 328 tmpreg &= 0xFC00;
<> 144:ef7eb2e8f9f7 329 // Set new address
<> 144:ef7eb2e8f9f7 330 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
<> 144:ef7eb2e8f9f7 331 // Store the new register value
<> 144:ef7eb2e8f9f7 332 i2c->OAR1 = tmpreg;
<> 144:ef7eb2e8f9f7 333 }
<> 144:ef7eb2e8f9f7 334
<> 144:ef7eb2e8f9f7 335 void i2c_slave_mode(i2c_t *obj, int enable_slave)
<> 144:ef7eb2e8f9f7 336 {
<> 144:ef7eb2e8f9f7 337 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 338 if (enable_slave) {
<> 144:ef7eb2e8f9f7 339 obj->slave = 1;
<> 144:ef7eb2e8f9f7 340 /* Enable Address Acknowledge */
<> 144:ef7eb2e8f9f7 341 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
<> 144:ef7eb2e8f9f7 342 }
<> 144:ef7eb2e8f9f7 343 }
<> 144:ef7eb2e8f9f7 344
<> 144:ef7eb2e8f9f7 345 // See I2CSlave.h
<> 144:ef7eb2e8f9f7 346 #define NoData 0 // the slave has not been addressed
<> 144:ef7eb2e8f9f7 347 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
<> 144:ef7eb2e8f9f7 348 #define WriteGeneral 2 // the master is writing to all slave
<> 144:ef7eb2e8f9f7 349 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
<> 144:ef7eb2e8f9f7 350
<> 144:ef7eb2e8f9f7 351 int i2c_slave_receive(i2c_t *obj)
<> 144:ef7eb2e8f9f7 352 {
<> 144:ef7eb2e8f9f7 353 int retValue = NoData;
<> 144:ef7eb2e8f9f7 354
<> 144:ef7eb2e8f9f7 355 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
<> 144:ef7eb2e8f9f7 356 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
<> 144:ef7eb2e8f9f7 357 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1)
<> 144:ef7eb2e8f9f7 358 retValue = ReadAddressed;
<> 144:ef7eb2e8f9f7 359 else
<> 144:ef7eb2e8f9f7 360 retValue = WriteAddressed;
<> 144:ef7eb2e8f9f7 361
<> 144:ef7eb2e8f9f7 362 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
<> 144:ef7eb2e8f9f7 363 }
<> 144:ef7eb2e8f9f7 364 }
<> 144:ef7eb2e8f9f7 365
<> 144:ef7eb2e8f9f7 366 return (retValue);
<> 144:ef7eb2e8f9f7 367 }
<> 144:ef7eb2e8f9f7 368
<> 144:ef7eb2e8f9f7 369 int i2c_slave_read(i2c_t *obj, char *data, int length)
<> 144:ef7eb2e8f9f7 370 {
<> 144:ef7eb2e8f9f7 371 uint32_t Timeout;
<> 144:ef7eb2e8f9f7 372 int size = 0;
<> 144:ef7eb2e8f9f7 373
<> 144:ef7eb2e8f9f7 374 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 375
<> 144:ef7eb2e8f9f7 376 while (length > 0) {
<> 144:ef7eb2e8f9f7 377 /* Wait until RXNE flag is set */
<> 144:ef7eb2e8f9f7 378 // Wait until the byte is received
<> 144:ef7eb2e8f9f7 379 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 380 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
<> 144:ef7eb2e8f9f7 381 Timeout--;
<> 144:ef7eb2e8f9f7 382 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 383 return -1;
<> 144:ef7eb2e8f9f7 384 }
<> 144:ef7eb2e8f9f7 385 }
<> 144:ef7eb2e8f9f7 386
<> 144:ef7eb2e8f9f7 387 /* Read data from DR */
<> 144:ef7eb2e8f9f7 388 (*data++) = I2cHandle.Instance->DR;
<> 144:ef7eb2e8f9f7 389 length--;
<> 144:ef7eb2e8f9f7 390 size++;
<> 144:ef7eb2e8f9f7 391
<> 144:ef7eb2e8f9f7 392 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
<> 144:ef7eb2e8f9f7 393 /* Read data from DR */
<> 144:ef7eb2e8f9f7 394 (*data++) = I2cHandle.Instance->DR;
<> 144:ef7eb2e8f9f7 395 length--;
<> 144:ef7eb2e8f9f7 396 size++;
<> 144:ef7eb2e8f9f7 397 }
<> 144:ef7eb2e8f9f7 398 }
<> 144:ef7eb2e8f9f7 399
<> 144:ef7eb2e8f9f7 400 /* Wait until STOP flag is set */
<> 144:ef7eb2e8f9f7 401 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 402 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
<> 144:ef7eb2e8f9f7 403 Timeout--;
<> 144:ef7eb2e8f9f7 404 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 405 return -1;
<> 144:ef7eb2e8f9f7 406 }
<> 144:ef7eb2e8f9f7 407 }
<> 144:ef7eb2e8f9f7 408
<> 144:ef7eb2e8f9f7 409 /* Clear STOP flag */
<> 144:ef7eb2e8f9f7 410 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
<> 144:ef7eb2e8f9f7 411
<> 144:ef7eb2e8f9f7 412 /* Wait until BUSY flag is reset */
<> 144:ef7eb2e8f9f7 413 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 414 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
<> 144:ef7eb2e8f9f7 415 Timeout--;
<> 144:ef7eb2e8f9f7 416 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 417 return -1;
<> 144:ef7eb2e8f9f7 418 }
<> 144:ef7eb2e8f9f7 419 }
<> 144:ef7eb2e8f9f7 420
<> 144:ef7eb2e8f9f7 421 return size;
<> 144:ef7eb2e8f9f7 422 }
<> 144:ef7eb2e8f9f7 423
<> 144:ef7eb2e8f9f7 424 int i2c_slave_write(i2c_t *obj, const char *data, int length)
<> 144:ef7eb2e8f9f7 425 {
<> 144:ef7eb2e8f9f7 426 uint32_t Timeout;
<> 144:ef7eb2e8f9f7 427 int size = 0;
<> 144:ef7eb2e8f9f7 428
<> 144:ef7eb2e8f9f7 429 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
<> 144:ef7eb2e8f9f7 430
<> 144:ef7eb2e8f9f7 431 while (length > 0) {
<> 144:ef7eb2e8f9f7 432 /* Wait until TXE flag is set */
<> 144:ef7eb2e8f9f7 433 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 434 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
<> 144:ef7eb2e8f9f7 435 Timeout--;
<> 144:ef7eb2e8f9f7 436 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 437 return -1;
<> 144:ef7eb2e8f9f7 438 }
<> 144:ef7eb2e8f9f7 439 }
<> 144:ef7eb2e8f9f7 440
<> 144:ef7eb2e8f9f7 441
<> 144:ef7eb2e8f9f7 442 /* Write data to DR */
<> 144:ef7eb2e8f9f7 443 I2cHandle.Instance->DR = (*data++);
<> 144:ef7eb2e8f9f7 444 length--;
<> 144:ef7eb2e8f9f7 445 size++;
<> 144:ef7eb2e8f9f7 446
<> 144:ef7eb2e8f9f7 447 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
<> 144:ef7eb2e8f9f7 448 /* Write data to DR */
<> 144:ef7eb2e8f9f7 449 I2cHandle.Instance->DR = (*data++);
<> 144:ef7eb2e8f9f7 450 length--;
<> 144:ef7eb2e8f9f7 451 size++;
<> 144:ef7eb2e8f9f7 452 }
<> 144:ef7eb2e8f9f7 453 }
<> 144:ef7eb2e8f9f7 454
<> 144:ef7eb2e8f9f7 455 /* Wait until AF flag is set */
<> 144:ef7eb2e8f9f7 456 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 457 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
<> 144:ef7eb2e8f9f7 458 Timeout--;
<> 144:ef7eb2e8f9f7 459 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 460 return -1;
<> 144:ef7eb2e8f9f7 461 }
<> 144:ef7eb2e8f9f7 462 }
<> 144:ef7eb2e8f9f7 463
<> 144:ef7eb2e8f9f7 464
<> 144:ef7eb2e8f9f7 465 /* Clear AF flag */
<> 144:ef7eb2e8f9f7 466 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
<> 144:ef7eb2e8f9f7 467
<> 144:ef7eb2e8f9f7 468
<> 144:ef7eb2e8f9f7 469 /* Wait until BUSY flag is reset */
<> 144:ef7eb2e8f9f7 470 Timeout = FLAG_TIMEOUT;
<> 144:ef7eb2e8f9f7 471 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
<> 144:ef7eb2e8f9f7 472 Timeout--;
<> 144:ef7eb2e8f9f7 473 if (Timeout == 0) {
<> 144:ef7eb2e8f9f7 474 return -1;
<> 144:ef7eb2e8f9f7 475 }
<> 144:ef7eb2e8f9f7 476 }
<> 144:ef7eb2e8f9f7 477
<> 144:ef7eb2e8f9f7 478 I2cHandle.State = HAL_I2C_STATE_READY;
<> 144:ef7eb2e8f9f7 479
<> 144:ef7eb2e8f9f7 480 /* Process Unlocked */
<> 144:ef7eb2e8f9f7 481 __HAL_UNLOCK(&I2cHandle);
<> 144:ef7eb2e8f9f7 482
<> 144:ef7eb2e8f9f7 483 return size;
<> 144:ef7eb2e8f9f7 484 }
<> 144:ef7eb2e8f9f7 485
<> 144:ef7eb2e8f9f7 486
<> 144:ef7eb2e8f9f7 487 #endif // DEVICE_I2CSLAVE
<> 144:ef7eb2e8f9f7 488
<> 144:ef7eb2e8f9f7 489 #endif // DEVICE_I2C