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Dependents:   MX106-finaltest

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_STM32F1/i2c_api.c@508:4f5903e025e6, 2015-04-09 (annotated)

Committer:
mbed_official
Date:
Thu Apr 09 06:45:08 2015 +0100
Revision:
508:4f5903e025e6
Parent:
targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/i2c_api.c@489:119543c9f674 
Synchronized with git revision 643cd23443352254ef51f4be0974b6e526142078



Full URL: https://github.com/mbedmicro/mbed/commit/643cd23443352254ef51f4be0974b6e526142078/



STM32F3xx - hal reorganization

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 56:99eb381a3269 1 /* mbed Microcontroller Library
mbed_official 70:c1fbde68b492 2 *******************************************************************************
mbed_official 70:c1fbde68b492 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 70:c1fbde68b492 4 * All rights reserved.
mbed_official 56:99eb381a3269 5 *
mbed_official 70:c1fbde68b492 6 * Redistribution and use in source and binary forms, with or without
mbed_official 70:c1fbde68b492 7 * modification, are permitted provided that the following conditions are met:
mbed_official 56:99eb381a3269 8 *
mbed_official 70:c1fbde68b492 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 70:c1fbde68b492 10 * this list of conditions and the following disclaimer.
mbed_official 70:c1fbde68b492 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 70:c1fbde68b492 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 70:c1fbde68b492 13 * and/or other materials provided with the distribution.
mbed_official 70:c1fbde68b492 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 70:c1fbde68b492 15 * may be used to endorse or promote products derived from this software
mbed_official 70:c1fbde68b492 16 * without specific prior written permission.
mbed_official 56:99eb381a3269 17 *
mbed_official 70:c1fbde68b492 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 70:c1fbde68b492 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 70:c1fbde68b492 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 70:c1fbde68b492 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 70:c1fbde68b492 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 70:c1fbde68b492 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 70:c1fbde68b492 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 70:c1fbde68b492 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 70:c1fbde68b492 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 70:c1fbde68b492 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 70:c1fbde68b492 28 *******************************************************************************
mbed_official 56:99eb381a3269 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 56:99eb381a3269 31 #include "i2c_api.h"
mbed_official 56:99eb381a3269 32
mbed_official 56:99eb381a3269 33 #if DEVICE_I2C
mbed_official 56:99eb381a3269 34
mbed_official 56:99eb381a3269 35 #include "cmsis.h"
mbed_official 56:99eb381a3269 36 #include "pinmap.h"
mbed_official 414:4ec4c5b614b0 37 #include "PeripheralPins.h"
mbed_official 56:99eb381a3269 38
mbed_official 56:99eb381a3269 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 174:8bb9f3a33240 40 not based on accurate values, they just guarantee that the application will
mbed_official 174:8bb9f3a33240 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 56:99eb381a3269 42 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 56:99eb381a3269 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 56:99eb381a3269 44
mbed_official 489:119543c9f674 45 I2C_HandleTypeDef I2cHandle;
mbed_official 305:1f0269907d8b 46
mbed_official 402:09075a3b15e3 47 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
mbed_official 402:09075a3b15e3 48 {
mbed_official 489:119543c9f674 49 static int i2c1_inited = 0;
mbed_official 489:119543c9f674 50 static int i2c2_inited = 0;
mbed_official 489:119543c9f674 51
mbed_official 56:99eb381a3269 52 // Determine the I2C to use
mbed_official 56:99eb381a3269 53 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 56:99eb381a3269 54 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 56:99eb381a3269 55
mbed_official 56:99eb381a3269 56 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 57 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 56:99eb381a3269 58
mbed_official 489:119543c9f674 59 // Check if I2C peripherals are already configured
mbed_official 489:119543c9f674 60 if ((obj->i2c == I2C_1) && i2c1_inited) return;
mbed_official 489:119543c9f674 61 if ((obj->i2c == I2C_2) && i2c2_inited) return;
mbed_official 489:119543c9f674 62
mbed_official 489:119543c9f674 63 // Set I2C clock
mbed_official 489:119543c9f674 64 if (obj->i2c == I2C_1) {
mbed_official 305:1f0269907d8b 65 i2c1_inited = 1;
mbed_official 489:119543c9f674 66 __I2C1_CLK_ENABLE();
mbed_official 56:99eb381a3269 67 }
mbed_official 489:119543c9f674 68
mbed_official 489:119543c9f674 69 if (obj->i2c == I2C_2) {
mbed_official 305:1f0269907d8b 70 i2c2_inited = 1;
mbed_official 489:119543c9f674 71 __I2C2_CLK_ENABLE();
mbed_official 383:0564d9840d0d 72 }
mbed_official 174:8bb9f3a33240 73
mbed_official 489:119543c9f674 74 // Configure I2C pins
mbed_official 489:119543c9f674 75 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 489:119543c9f674 76 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 489:119543c9f674 77 pin_mode(sda, OpenDrain);
mbed_official 489:119543c9f674 78 pin_mode(scl, OpenDrain);
mbed_official 489:119543c9f674 79
mbed_official 56:99eb381a3269 80 // Reset to clear pending flags if any
mbed_official 56:99eb381a3269 81 i2c_reset(obj);
mbed_official 174:8bb9f3a33240 82
mbed_official 56:99eb381a3269 83 // I2C configuration
mbed_official 174:8bb9f3a33240 84 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 489:119543c9f674 85
mbed_official 489:119543c9f674 86 // I2C master by default
mbed_official 489:119543c9f674 87 obj->slave = 0;
mbed_official 56:99eb381a3269 88 }
mbed_official 56:99eb381a3269 89
mbed_official 402:09075a3b15e3 90 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 402:09075a3b15e3 91 {
mbed_official 489:119543c9f674 92 MBED_ASSERT((hz != 0) && (hz <= 400000));
mbed_official 489:119543c9f674 93 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 383:0564d9840d0d 94 int timeout;
mbed_official 383:0564d9840d0d 95
mbed_official 489:119543c9f674 96 // wait before init
mbed_official 489:119543c9f674 97 timeout = LONG_TIMEOUT;
mbed_official 489:119543c9f674 98 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 174:8bb9f3a33240 99
mbed_official 489:119543c9f674 100 // I2C configuration
mbed_official 489:119543c9f674 101 I2cHandle.Init.ClockSpeed = hz;
mbed_official 489:119543c9f674 102 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
mbed_official 489:119543c9f674 103 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 489:119543c9f674 104 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 489:119543c9f674 105 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 489:119543c9f674 106 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 489:119543c9f674 107 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 489:119543c9f674 108 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 489:119543c9f674 109 HAL_I2C_Init(&I2cHandle);
mbed_official 174:8bb9f3a33240 110
mbed_official 489:119543c9f674 111 if (obj->slave) {
mbed_official 489:119543c9f674 112 // Enable Address Acknowledge
mbed_official 489:119543c9f674 113 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 56:99eb381a3269 114 }
mbed_official 56:99eb381a3269 115 }
mbed_official 56:99eb381a3269 116
mbed_official 402:09075a3b15e3 117 inline int i2c_start(i2c_t *obj)
mbed_official 402:09075a3b15e3 118 {
mbed_official 56:99eb381a3269 119 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 489:119543c9f674 120 int timeout;
mbed_official 174:8bb9f3a33240 121
mbed_official 489:119543c9f674 122 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 489:119543c9f674 123
mbed_official 489:119543c9f674 124 // Clear Acknowledge failure flag
mbed_official 489:119543c9f674 125 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 174:8bb9f3a33240 126
mbed_official 56:99eb381a3269 127 // Generate the START condition
mbed_official 489:119543c9f674 128 i2c->CR1 |= I2C_CR1_START;
mbed_official 174:8bb9f3a33240 129
mbed_official 56:99eb381a3269 130 // Wait the START condition has been correctly sent
mbed_official 56:99eb381a3269 131 timeout = FLAG_TIMEOUT;
mbed_official 489:119543c9f674 132 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 489:119543c9f674 133 if ((timeout--) == 0) {
mbed_official 80:66393a7b209d 134 return 1;
mbed_official 80:66393a7b209d 135 }
mbed_official 56:99eb381a3269 136 }
mbed_official 174:8bb9f3a33240 137
mbed_official 58:3b55b7a41411 138 return 0;
mbed_official 56:99eb381a3269 139 }
mbed_official 56:99eb381a3269 140
mbed_official 402:09075a3b15e3 141 inline int i2c_stop(i2c_t *obj)
mbed_official 402:09075a3b15e3 142 {
mbed_official 56:99eb381a3269 143 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 174:8bb9f3a33240 144
mbed_official 489:119543c9f674 145 // Generate the STOP condition
mbed_official 489:119543c9f674 146 i2c->CR1 |= I2C_CR1_STOP;
mbed_official 174:8bb9f3a33240 147
mbed_official 58:3b55b7a41411 148 return 0;
mbed_official 56:99eb381a3269 149 }
mbed_official 56:99eb381a3269 150
mbed_official 402:09075a3b15e3 151 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 402:09075a3b15e3 152 {
mbed_official 56:99eb381a3269 153 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 489:119543c9f674 154 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 489:119543c9f674 155 int timeout;
mbed_official 489:119543c9f674 156 int count;
mbed_official 489:119543c9f674 157 int value;
mbed_official 174:8bb9f3a33240 158
mbed_official 489:119543c9f674 159 // Generate start condition
mbed_official 56:99eb381a3269 160 i2c_start(obj);
mbed_official 56:99eb381a3269 161
mbed_official 489:119543c9f674 162 // Send address for read
mbed_official 489:119543c9f674 163 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
mbed_official 56:99eb381a3269 164
mbed_official 56:99eb381a3269 165 // Wait address is acknowledged
mbed_official 56:99eb381a3269 166 timeout = FLAG_TIMEOUT;
mbed_official 489:119543c9f674 167 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 80:66393a7b209d 168 timeout--;
mbed_official 80:66393a7b209d 169 if (timeout == 0) {
mbed_official 247:135e3186a638 170 return -1;
mbed_official 80:66393a7b209d 171 }
mbed_official 56:99eb381a3269 172 }
mbed_official 489:119543c9f674 173 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 174:8bb9f3a33240 174
mbed_official 56:99eb381a3269 175 // Read all bytes except last one
mbed_official 56:99eb381a3269 176 for (count = 0; count < (length - 1); count++) {
mbed_official 489:119543c9f674 177 value = i2c_byte_read(obj, 0);
mbed_official 56:99eb381a3269 178 data[count] = (char)value;
mbed_official 56:99eb381a3269 179 }
mbed_official 174:8bb9f3a33240 180
mbed_official 56:99eb381a3269 181 // If not repeated start, send stop.
mbed_official 56:99eb381a3269 182 // Warning: must be done BEFORE the data is read.
mbed_official 56:99eb381a3269 183 if (stop) {
mbed_official 56:99eb381a3269 184 i2c_stop(obj);
mbed_official 56:99eb381a3269 185 }
mbed_official 56:99eb381a3269 186
mbed_official 56:99eb381a3269 187 // Read the last byte
mbed_official 489:119543c9f674 188 value = i2c_byte_read(obj, 1);
mbed_official 56:99eb381a3269 189 data[count] = (char)value;
mbed_official 174:8bb9f3a33240 190
mbed_official 56:99eb381a3269 191 return length;
mbed_official 56:99eb381a3269 192 }
mbed_official 56:99eb381a3269 193
mbed_official 402:09075a3b15e3 194 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 402:09075a3b15e3 195 {
mbed_official 56:99eb381a3269 196 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 489:119543c9f674 197 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 489:119543c9f674 198 int timeout;
mbed_official 489:119543c9f674 199 int count;
mbed_official 208:4557f4bb2dd5 200
mbed_official 489:119543c9f674 201 // Generate start condition
mbed_official 56:99eb381a3269 202 i2c_start(obj);
mbed_official 56:99eb381a3269 203
mbed_official 489:119543c9f674 204 // Send address for write
mbed_official 489:119543c9f674 205 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
mbed_official 174:8bb9f3a33240 206
mbed_official 56:99eb381a3269 207 // Wait address is acknowledged
mbed_official 56:99eb381a3269 208 timeout = FLAG_TIMEOUT;
mbed_official 489:119543c9f674 209 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 80:66393a7b209d 210 timeout--;
mbed_official 80:66393a7b209d 211 if (timeout == 0) {
mbed_official 247:135e3186a638 212 return -1;
mbed_official 80:66393a7b209d 213 }
mbed_official 56:99eb381a3269 214 }
mbed_official 489:119543c9f674 215 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 56:99eb381a3269 216
mbed_official 489:119543c9f674 217 // Write all bytes
mbed_official 56:99eb381a3269 218 for (count = 0; count < length; count++) {
mbed_official 58:3b55b7a41411 219 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 58:3b55b7a41411 220 i2c_stop(obj);
mbed_official 489:119543c9f674 221 return -1;
mbed_official 56:99eb381a3269 222 }
mbed_official 56:99eb381a3269 223 }
mbed_official 56:99eb381a3269 224
mbed_official 56:99eb381a3269 225 // If not repeated start, send stop.
mbed_official 56:99eb381a3269 226 if (stop) {
mbed_official 56:99eb381a3269 227 i2c_stop(obj);
mbed_official 56:99eb381a3269 228 }
mbed_official 56:99eb381a3269 229
mbed_official 56:99eb381a3269 230 return count;
mbed_official 56:99eb381a3269 231 }
mbed_official 56:99eb381a3269 232
mbed_official 402:09075a3b15e3 233 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 402:09075a3b15e3 234 {
mbed_official 56:99eb381a3269 235 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 489:119543c9f674 236 int timeout;
mbed_official 174:8bb9f3a33240 237
mbed_official 56:99eb381a3269 238 if (last) {
mbed_official 56:99eb381a3269 239 // Don't acknowledge the last byte
mbed_official 489:119543c9f674 240 i2c->CR1 &= ~I2C_CR1_ACK;
mbed_official 56:99eb381a3269 241 } else {
mbed_official 56:99eb381a3269 242 // Acknowledge the byte
mbed_official 489:119543c9f674 243 i2c->CR1 |= I2C_CR1_ACK;
mbed_official 56:99eb381a3269 244 }
mbed_official 56:99eb381a3269 245
mbed_official 56:99eb381a3269 246 // Wait until the byte is received
mbed_official 56:99eb381a3269 247 timeout = FLAG_TIMEOUT;
mbed_official 489:119543c9f674 248 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 489:119543c9f674 249 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 250 return -1;
mbed_official 80:66393a7b209d 251 }
mbed_official 56:99eb381a3269 252 }
mbed_official 56:99eb381a3269 253
mbed_official 489:119543c9f674 254 return (int)i2c->DR;
mbed_official 56:99eb381a3269 255 }
mbed_official 56:99eb381a3269 256
mbed_official 402:09075a3b15e3 257 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 402:09075a3b15e3 258 {
mbed_official 56:99eb381a3269 259 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 489:119543c9f674 260 int timeout;
mbed_official 56:99eb381a3269 261
mbed_official 489:119543c9f674 262 i2c->DR = (uint8_t)data;
mbed_official 56:99eb381a3269 263
mbed_official 56:99eb381a3269 264 // Wait until the byte is transmitted
mbed_official 208:4557f4bb2dd5 265 timeout = FLAG_TIMEOUT;
mbed_official 489:119543c9f674 266 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
mbed_official 489:119543c9f674 267 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
mbed_official 489:119543c9f674 268 if ((timeout--) == 0) {
mbed_official 58:3b55b7a41411 269 return 0;
mbed_official 56:99eb381a3269 270 }
mbed_official 56:99eb381a3269 271 }
mbed_official 174:8bb9f3a33240 272
mbed_official 58:3b55b7a41411 273 return 1;
mbed_official 56:99eb381a3269 274 }
mbed_official 56:99eb381a3269 275
mbed_official 402:09075a3b15e3 276 void i2c_reset(i2c_t *obj)
mbed_official 402:09075a3b15e3 277 {
mbed_official 489:119543c9f674 278 int timeout;
mbed_official 383:0564d9840d0d 279
mbed_official 489:119543c9f674 280 // Wait before reset
mbed_official 305:1f0269907d8b 281 timeout = LONG_TIMEOUT;
mbed_official 489:119543c9f674 282 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 489:119543c9f674 283
mbed_official 489:119543c9f674 284 if (obj->i2c == I2C_1) {
mbed_official 489:119543c9f674 285 __I2C1_FORCE_RESET();
mbed_official 489:119543c9f674 286 __I2C1_RELEASE_RESET();
mbed_official 383:0564d9840d0d 287 }
mbed_official 383:0564d9840d0d 288
mbed_official 56:99eb381a3269 289 if (obj->i2c == I2C_2) {
mbed_official 489:119543c9f674 290 __I2C2_FORCE_RESET();
mbed_official 489:119543c9f674 291 __I2C2_RELEASE_RESET();
mbed_official 56:99eb381a3269 292 }
mbed_official 56:99eb381a3269 293 }
mbed_official 56:99eb381a3269 294
mbed_official 56:99eb381a3269 295 #if DEVICE_I2CSLAVE
mbed_official 56:99eb381a3269 296
mbed_official 402:09075a3b15e3 297 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 402:09075a3b15e3 298 {
mbed_official 56:99eb381a3269 299 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 489:119543c9f674 300 uint16_t tmpreg = 0;
mbed_official 174:8bb9f3a33240 301
mbed_official 56:99eb381a3269 302 // Get the old register value
mbed_official 56:99eb381a3269 303 tmpreg = i2c->OAR1;
mbed_official 56:99eb381a3269 304 // Reset address bits
mbed_official 56:99eb381a3269 305 tmpreg &= 0xFC00;
mbed_official 56:99eb381a3269 306 // Set new address
mbed_official 56:99eb381a3269 307 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 56:99eb381a3269 308 // Store the new register value
mbed_official 56:99eb381a3269 309 i2c->OAR1 = tmpreg;
mbed_official 56:99eb381a3269 310 }
mbed_official 56:99eb381a3269 311
mbed_official 402:09075a3b15e3 312 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 402:09075a3b15e3 313 {
mbed_official 489:119543c9f674 314 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 489:119543c9f674 315 if (enable_slave) {
mbed_official 489:119543c9f674 316 obj->slave = 1;
mbed_official 489:119543c9f674 317 /* Enable Address Acknowledge */
mbed_official 489:119543c9f674 318 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 489:119543c9f674 319 }
mbed_official 56:99eb381a3269 320 }
mbed_official 56:99eb381a3269 321
mbed_official 58:3b55b7a41411 322 // See I2CSlave.h
mbed_official 58:3b55b7a41411 323 #define NoData 0 // the slave has not been addressed
mbed_official 58:3b55b7a41411 324 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 58:3b55b7a41411 325 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 58:3b55b7a41411 326 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 56:99eb381a3269 327
mbed_official 402:09075a3b15e3 328 int i2c_slave_receive(i2c_t *obj)
mbed_official 402:09075a3b15e3 329 {
mbed_official 489:119543c9f674 330 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 489:119543c9f674 331 int retValue = NoData;
mbed_official 181:a4cbdfbbd2f4 332
mbed_official 489:119543c9f674 333 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 489:119543c9f674 334 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 489:119543c9f674 335 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1) {
mbed_official 181:a4cbdfbbd2f4 336 retValue = ReadAddressed;
mbed_official 489:119543c9f674 337 } else {
mbed_official 489:119543c9f674 338 retValue = WriteAddressed;
mbed_official 489:119543c9f674 339 }
mbed_official 489:119543c9f674 340 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 208:4557f4bb2dd5 341 }
mbed_official 181:a4cbdfbbd2f4 342 }
mbed_official 489:119543c9f674 343
mbed_official 208:4557f4bb2dd5 344 return (retValue);
mbed_official 56:99eb381a3269 345 }
mbed_official 56:99eb381a3269 346
mbed_official 402:09075a3b15e3 347 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 402:09075a3b15e3 348 {
mbed_official 489:119543c9f674 349 uint32_t Timeout;
mbed_official 489:119543c9f674 350 int size = 0;
mbed_official 489:119543c9f674 351
mbed_official 489:119543c9f674 352 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 174:8bb9f3a33240 353
mbed_official 489:119543c9f674 354 while (length > 0) {
mbed_official 489:119543c9f674 355 // Wait until RXNE flag is set
mbed_official 489:119543c9f674 356 // Wait until the byte is received
mbed_official 489:119543c9f674 357 Timeout = FLAG_TIMEOUT;
mbed_official 489:119543c9f674 358 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 489:119543c9f674 359 Timeout--;
mbed_official 489:119543c9f674 360 if (Timeout == 0) {
mbed_official 489:119543c9f674 361 return -1;
mbed_official 489:119543c9f674 362 }
mbed_official 489:119543c9f674 363 }
mbed_official 489:119543c9f674 364
mbed_official 489:119543c9f674 365 // Read data
mbed_official 489:119543c9f674 366 (*data++) = I2cHandle.Instance->DR;
mbed_official 489:119543c9f674 367 length--;
mbed_official 489:119543c9f674 368 size++;
mbed_official 489:119543c9f674 369
mbed_official 489:119543c9f674 370 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 489:119543c9f674 371 // Read data
mbed_official 489:119543c9f674 372 (*data++) = I2cHandle.Instance->DR;
mbed_official 489:119543c9f674 373 length--;
mbed_official 489:119543c9f674 374 size++;
mbed_official 489:119543c9f674 375 }
mbed_official 58:3b55b7a41411 376 }
mbed_official 174:8bb9f3a33240 377
mbed_official 489:119543c9f674 378 // Wait until STOP flag is set
mbed_official 489:119543c9f674 379 Timeout = FLAG_TIMEOUT;
mbed_official 489:119543c9f674 380 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 489:119543c9f674 381 Timeout--;
mbed_official 489:119543c9f674 382 if (Timeout == 0) {
mbed_official 489:119543c9f674 383 return -1;
mbed_official 489:119543c9f674 384 }
mbed_official 489:119543c9f674 385 }
mbed_official 489:119543c9f674 386
mbed_official 489:119543c9f674 387 // Clear STOP flag
mbed_official 489:119543c9f674 388 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
mbed_official 489:119543c9f674 389
mbed_official 489:119543c9f674 390 // Wait until BUSY flag is reset
mbed_official 489:119543c9f674 391 Timeout = FLAG_TIMEOUT;
mbed_official 489:119543c9f674 392 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 489:119543c9f674 393 Timeout--;
mbed_official 489:119543c9f674 394 if (Timeout == 0) {
mbed_official 489:119543c9f674 395 return -1;
mbed_official 489:119543c9f674 396 }
mbed_official 489:119543c9f674 397 }
mbed_official 489:119543c9f674 398
mbed_official 489:119543c9f674 399 return size;
mbed_official 56:99eb381a3269 400 }
mbed_official 56:99eb381a3269 401
mbed_official 402:09075a3b15e3 402 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 402:09075a3b15e3 403 {
mbed_official 489:119543c9f674 404 uint32_t Timeout;
mbed_official 489:119543c9f674 405 int size = 0;
mbed_official 489:119543c9f674 406
mbed_official 489:119543c9f674 407 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 174:8bb9f3a33240 408
mbed_official 489:119543c9f674 409 while (length > 0) {
mbed_official 489:119543c9f674 410 // Wait until TXE flag is set
mbed_official 489:119543c9f674 411 Timeout = FLAG_TIMEOUT;
mbed_official 489:119543c9f674 412 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
mbed_official 489:119543c9f674 413 Timeout--;
mbed_official 489:119543c9f674 414 if (Timeout == 0) {
mbed_official 489:119543c9f674 415 return -1;
mbed_official 489:119543c9f674 416 }
mbed_official 489:119543c9f674 417 }
mbed_official 489:119543c9f674 418
mbed_official 489:119543c9f674 419 // Write data
mbed_official 489:119543c9f674 420 I2cHandle.Instance->DR = (*data++);
mbed_official 489:119543c9f674 421 length--;
mbed_official 489:119543c9f674 422 size++;
mbed_official 489:119543c9f674 423
mbed_official 489:119543c9f674 424 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 489:119543c9f674 425 // Write data to DR
mbed_official 489:119543c9f674 426 I2cHandle.Instance->DR = (*data++);
mbed_official 489:119543c9f674 427 length--;
mbed_official 489:119543c9f674 428 size++;
mbed_official 489:119543c9f674 429 }
mbed_official 58:3b55b7a41411 430 }
mbed_official 174:8bb9f3a33240 431
mbed_official 489:119543c9f674 432 // Wait until AF flag is set
mbed_official 489:119543c9f674 433 Timeout = FLAG_TIMEOUT;
mbed_official 489:119543c9f674 434 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
mbed_official 489:119543c9f674 435 Timeout--;
mbed_official 489:119543c9f674 436 if (Timeout == 0) {
mbed_official 489:119543c9f674 437 return -1;
mbed_official 489:119543c9f674 438 }
mbed_official 489:119543c9f674 439 }
mbed_official 489:119543c9f674 440
mbed_official 489:119543c9f674 441 // Clear AF flag
mbed_official 489:119543c9f674 442 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 489:119543c9f674 443
mbed_official 489:119543c9f674 444 // Wait until BUSY flag is reset
mbed_official 489:119543c9f674 445 Timeout = FLAG_TIMEOUT;
mbed_official 489:119543c9f674 446 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 489:119543c9f674 447 Timeout--;
mbed_official 489:119543c9f674 448 if (Timeout == 0) {
mbed_official 489:119543c9f674 449 return -1;
mbed_official 489:119543c9f674 450 }
mbed_official 489:119543c9f674 451 }
mbed_official 489:119543c9f674 452
mbed_official 489:119543c9f674 453 return size;
mbed_official 56:99eb381a3269 454 }
mbed_official 56:99eb381a3269 455
mbed_official 489:119543c9f674 456
mbed_official 56:99eb381a3269 457 #endif // DEVICE_I2CSLAVE
mbed_official 56:99eb381a3269 458
mbed_official 56:99eb381a3269 459 #endif // DEVICE_I2C