Renesas / mbed-src_GR-PEACH_rev_b

mbed library sources for GR-PEACH rev.B.

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_F100RB/i2c_api.c@497:d54623194236, 2015-03-26 (annotated)

Committer:
mbed_official
Date:
Thu Mar 26 13:45:12 2015 +0000
Revision:
497:d54623194236
Parent:
227:7bd0639b8911 
Synchronized with git revision 0251fefac99a5b59beb481e845c6fbf48736bac6



Full URL: https://github.com/mbedmicro/mbed/commit/0251fefac99a5b59beb481e845c6fbf48736bac6/



DISCO_F100RB -Support HAL driver

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 126:549ba18ddd81 1 /* mbed Microcontroller Library
mbed_official 126:549ba18ddd81 2 *******************************************************************************
mbed_official 126:549ba18ddd81 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 126:549ba18ddd81 4 * All rights reserved.
mbed_official 126:549ba18ddd81 5 *
mbed_official 126:549ba18ddd81 6 * Redistribution and use in source and binary forms, with or without
mbed_official 126:549ba18ddd81 7 * modification, are permitted provided that the following conditions are met:
mbed_official 126:549ba18ddd81 8 *
mbed_official 126:549ba18ddd81 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 126:549ba18ddd81 10 * this list of conditions and the following disclaimer.
mbed_official 126:549ba18ddd81 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 126:549ba18ddd81 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 126:549ba18ddd81 13 * and/or other materials provided with the distribution.
mbed_official 126:549ba18ddd81 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 126:549ba18ddd81 15 * may be used to endorse or promote products derived from this software
mbed_official 126:549ba18ddd81 16 * without specific prior written permission.
mbed_official 126:549ba18ddd81 17 *
mbed_official 126:549ba18ddd81 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 126:549ba18ddd81 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 126:549ba18ddd81 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 126:549ba18ddd81 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 126:549ba18ddd81 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 126:549ba18ddd81 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 126:549ba18ddd81 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 126:549ba18ddd81 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 126:549ba18ddd81 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 126:549ba18ddd81 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 126:549ba18ddd81 28 *******************************************************************************
mbed_official 126:549ba18ddd81 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 126:549ba18ddd81 31 #include "i2c_api.h"
mbed_official 126:549ba18ddd81 32
mbed_official 126:549ba18ddd81 33 #if DEVICE_I2C
mbed_official 126:549ba18ddd81 34
mbed_official 126:549ba18ddd81 35 #include "cmsis.h"
mbed_official 126:549ba18ddd81 36 #include "pinmap.h"
mbed_official 497:d54623194236 37 #include "PeripheralPins.h"
mbed_official 126:549ba18ddd81 38
mbed_official 126:549ba18ddd81 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 227:7bd0639b8911 40 not based on accurate values, they just guarantee that the application will
mbed_official 227:7bd0639b8911 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 126:549ba18ddd81 42 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 126:549ba18ddd81 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 126:549ba18ddd81 44
mbed_official 497:d54623194236 45 I2C_HandleTypeDef I2cHandle;
mbed_official 126:549ba18ddd81 46
mbed_official 497:d54623194236 47 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
mbed_official 497:d54623194236 48 {
mbed_official 497:d54623194236 49 static int i2c1_inited = 0;
mbed_official 497:d54623194236 50 static int i2c2_inited = 0;
mbed_official 126:549ba18ddd81 51
mbed_official 126:549ba18ddd81 52 // Determine the I2C to use
mbed_official 126:549ba18ddd81 53 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 126:549ba18ddd81 54 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 126:549ba18ddd81 55
mbed_official 126:549ba18ddd81 56 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 57 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 126:549ba18ddd81 58
mbed_official 497:d54623194236 59 // Check if I2C peripherals are already configured
mbed_official 497:d54623194236 60 if ((obj->i2c == I2C_1) && i2c1_inited) return;
mbed_official 497:d54623194236 61 if ((obj->i2c == I2C_2) && i2c2_inited) return;
mbed_official 497:d54623194236 62
mbed_official 497:d54623194236 63 // Set I2C clock
mbed_official 227:7bd0639b8911 64 if (obj->i2c == I2C_1) {
mbed_official 497:d54623194236 65 i2c1_inited = 1;
mbed_official 497:d54623194236 66 __I2C1_CLK_ENABLE();
mbed_official 126:549ba18ddd81 67 }
mbed_official 126:549ba18ddd81 68 if (obj->i2c == I2C_2) {
mbed_official 497:d54623194236 69 i2c2_inited = 1;
mbed_official 497:d54623194236 70 __I2C2_CLK_ENABLE();
mbed_official 126:549ba18ddd81 71 }
mbed_official 126:549ba18ddd81 72
mbed_official 126:549ba18ddd81 73 // Configure I2C pins
mbed_official 497:d54623194236 74 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 126:549ba18ddd81 75 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 497:d54623194236 76 pin_mode(sda, OpenDrain);
mbed_official 126:549ba18ddd81 77 pin_mode(scl, OpenDrain);
mbed_official 126:549ba18ddd81 78
mbed_official 126:549ba18ddd81 79 // Reset to clear pending flags if any
mbed_official 126:549ba18ddd81 80 i2c_reset(obj);
mbed_official 126:549ba18ddd81 81
mbed_official 126:549ba18ddd81 82 // I2C configuration
mbed_official 227:7bd0639b8911 83 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 497:d54623194236 84
mbed_official 497:d54623194236 85 // I2C master by default
mbed_official 497:d54623194236 86 obj->slave = 0;
mbed_official 126:549ba18ddd81 87 }
mbed_official 126:549ba18ddd81 88
mbed_official 497:d54623194236 89 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 497:d54623194236 90 {
mbed_official 497:d54623194236 91 MBED_ASSERT((hz != 0) && (hz <= 400000));
mbed_official 497:d54623194236 92 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 497:d54623194236 93 int timeout;
mbed_official 126:549ba18ddd81 94
mbed_official 497:d54623194236 95 // wait before init
mbed_official 497:d54623194236 96 timeout = LONG_TIMEOUT;
mbed_official 497:d54623194236 97 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 126:549ba18ddd81 98
mbed_official 126:549ba18ddd81 99 // I2C configuration
mbed_official 497:d54623194236 100 I2cHandle.Init.ClockSpeed = hz;
mbed_official 497:d54623194236 101 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
mbed_official 497:d54623194236 102 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 497:d54623194236 103 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 497:d54623194236 104 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 497:d54623194236 105 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 497:d54623194236 106 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 497:d54623194236 107 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 497:d54623194236 108 HAL_I2C_Init(&I2cHandle);
mbed_official 497:d54623194236 109
mbed_official 497:d54623194236 110 if (obj->slave) {
mbed_official 497:d54623194236 111 // Enable Address Acknowledge
mbed_official 497:d54623194236 112 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 126:549ba18ddd81 113 }
mbed_official 126:549ba18ddd81 114 }
mbed_official 126:549ba18ddd81 115
mbed_official 497:d54623194236 116 inline int i2c_start(i2c_t *obj)
mbed_official 497:d54623194236 117 {
mbed_official 126:549ba18ddd81 118 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 119 int timeout;
mbed_official 126:549ba18ddd81 120
mbed_official 497:d54623194236 121 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 497:d54623194236 122
mbed_official 497:d54623194236 123 // Clear Acknowledge failure flag
mbed_official 497:d54623194236 124 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 126:549ba18ddd81 125
mbed_official 126:549ba18ddd81 126 // Generate the START condition
mbed_official 497:d54623194236 127 i2c->CR1 |= I2C_CR1_START;
mbed_official 126:549ba18ddd81 128
mbed_official 126:549ba18ddd81 129 // Wait the START condition has been correctly sent
mbed_official 126:549ba18ddd81 130 timeout = FLAG_TIMEOUT;
mbed_official 497:d54623194236 131 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 497:d54623194236 132 if ((timeout--) == 0) {
mbed_official 126:549ba18ddd81 133 return 1;
mbed_official 126:549ba18ddd81 134 }
mbed_official 126:549ba18ddd81 135 }
mbed_official 126:549ba18ddd81 136
mbed_official 126:549ba18ddd81 137 return 0;
mbed_official 126:549ba18ddd81 138 }
mbed_official 126:549ba18ddd81 139
mbed_official 497:d54623194236 140 inline int i2c_stop(i2c_t *obj)
mbed_official 497:d54623194236 141 {
mbed_official 126:549ba18ddd81 142 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 143
mbed_official 497:d54623194236 144 // Generate the STOP condition
mbed_official 497:d54623194236 145 i2c->CR1 |= I2C_CR1_STOP;
mbed_official 126:549ba18ddd81 146
mbed_official 126:549ba18ddd81 147 return 0;
mbed_official 126:549ba18ddd81 148 }
mbed_official 126:549ba18ddd81 149
mbed_official 497:d54623194236 150 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 497:d54623194236 151 {
mbed_official 126:549ba18ddd81 152 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 497:d54623194236 153 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 154 int timeout;
mbed_official 126:549ba18ddd81 155 int count;
mbed_official 126:549ba18ddd81 156 int value;
mbed_official 126:549ba18ddd81 157
mbed_official 497:d54623194236 158 // Generate start condition
mbed_official 126:549ba18ddd81 159 i2c_start(obj);
mbed_official 126:549ba18ddd81 160
mbed_official 497:d54623194236 161 // Send address for read
mbed_official 497:d54623194236 162 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
mbed_official 126:549ba18ddd81 163
mbed_official 126:549ba18ddd81 164 // Wait address is acknowledged
mbed_official 126:549ba18ddd81 165 timeout = FLAG_TIMEOUT;
mbed_official 497:d54623194236 166 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 126:549ba18ddd81 167 timeout--;
mbed_official 126:549ba18ddd81 168 if (timeout == 0) {
mbed_official 497:d54623194236 169 return -1;
mbed_official 126:549ba18ddd81 170 }
mbed_official 126:549ba18ddd81 171 }
mbed_official 497:d54623194236 172 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 126:549ba18ddd81 173
mbed_official 126:549ba18ddd81 174 // Read all bytes except last one
mbed_official 126:549ba18ddd81 175 for (count = 0; count < (length - 1); count++) {
mbed_official 126:549ba18ddd81 176 value = i2c_byte_read(obj, 0);
mbed_official 126:549ba18ddd81 177 data[count] = (char)value;
mbed_official 126:549ba18ddd81 178 }
mbed_official 126:549ba18ddd81 179
mbed_official 126:549ba18ddd81 180 // If not repeated start, send stop.
mbed_official 126:549ba18ddd81 181 // Warning: must be done BEFORE the data is read.
mbed_official 126:549ba18ddd81 182 if (stop) {
mbed_official 126:549ba18ddd81 183 i2c_stop(obj);
mbed_official 126:549ba18ddd81 184 }
mbed_official 126:549ba18ddd81 185
mbed_official 126:549ba18ddd81 186 // Read the last byte
mbed_official 126:549ba18ddd81 187 value = i2c_byte_read(obj, 1);
mbed_official 126:549ba18ddd81 188 data[count] = (char)value;
mbed_official 126:549ba18ddd81 189
mbed_official 126:549ba18ddd81 190 return length;
mbed_official 126:549ba18ddd81 191 }
mbed_official 126:549ba18ddd81 192
mbed_official 497:d54623194236 193 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 497:d54623194236 194 {
mbed_official 126:549ba18ddd81 195 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 497:d54623194236 196 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 197 int timeout;
mbed_official 126:549ba18ddd81 198 int count;
mbed_official 126:549ba18ddd81 199
mbed_official 497:d54623194236 200 // Generate start condition
mbed_official 126:549ba18ddd81 201 i2c_start(obj);
mbed_official 126:549ba18ddd81 202
mbed_official 497:d54623194236 203 // Send address for write
mbed_official 497:d54623194236 204 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
mbed_official 126:549ba18ddd81 205
mbed_official 126:549ba18ddd81 206 // Wait address is acknowledged
mbed_official 126:549ba18ddd81 207 timeout = FLAG_TIMEOUT;
mbed_official 497:d54623194236 208 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 126:549ba18ddd81 209 timeout--;
mbed_official 126:549ba18ddd81 210 if (timeout == 0) {
mbed_official 497:d54623194236 211 return -1;
mbed_official 126:549ba18ddd81 212 }
mbed_official 126:549ba18ddd81 213 }
mbed_official 497:d54623194236 214 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 126:549ba18ddd81 215
mbed_official 497:d54623194236 216 // Write all bytes
mbed_official 126:549ba18ddd81 217 for (count = 0; count < length; count++) {
mbed_official 126:549ba18ddd81 218 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 126:549ba18ddd81 219 i2c_stop(obj);
mbed_official 497:d54623194236 220 return -1;
mbed_official 126:549ba18ddd81 221 }
mbed_official 126:549ba18ddd81 222 }
mbed_official 126:549ba18ddd81 223
mbed_official 126:549ba18ddd81 224 // If not repeated start, send stop.
mbed_official 126:549ba18ddd81 225 if (stop) {
mbed_official 126:549ba18ddd81 226 i2c_stop(obj);
mbed_official 126:549ba18ddd81 227 }
mbed_official 126:549ba18ddd81 228
mbed_official 126:549ba18ddd81 229 return count;
mbed_official 126:549ba18ddd81 230 }
mbed_official 126:549ba18ddd81 231
mbed_official 497:d54623194236 232 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 497:d54623194236 233 {
mbed_official 126:549ba18ddd81 234 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 235 int timeout;
mbed_official 126:549ba18ddd81 236
mbed_official 126:549ba18ddd81 237 if (last) {
mbed_official 126:549ba18ddd81 238 // Don't acknowledge the last byte
mbed_official 497:d54623194236 239 i2c->CR1 &= ~I2C_CR1_ACK;
mbed_official 126:549ba18ddd81 240 } else {
mbed_official 126:549ba18ddd81 241 // Acknowledge the byte
mbed_official 497:d54623194236 242 i2c->CR1 |= I2C_CR1_ACK;
mbed_official 126:549ba18ddd81 243 }
mbed_official 126:549ba18ddd81 244
mbed_official 126:549ba18ddd81 245 // Wait until the byte is received
mbed_official 126:549ba18ddd81 246 timeout = FLAG_TIMEOUT;
mbed_official 497:d54623194236 247 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 497:d54623194236 248 if ((timeout--) == 0) {
mbed_official 497:d54623194236 249 return -1;
mbed_official 126:549ba18ddd81 250 }
mbed_official 126:549ba18ddd81 251 }
mbed_official 126:549ba18ddd81 252
mbed_official 497:d54623194236 253 return (int)i2c->DR;
mbed_official 126:549ba18ddd81 254 }
mbed_official 126:549ba18ddd81 255
mbed_official 497:d54623194236 256 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 497:d54623194236 257 {
mbed_official 126:549ba18ddd81 258 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 126:549ba18ddd81 259 int timeout;
mbed_official 126:549ba18ddd81 260
mbed_official 497:d54623194236 261 i2c->DR = (uint8_t)data;
mbed_official 126:549ba18ddd81 262
mbed_official 126:549ba18ddd81 263 // Wait until the byte is transmitted
mbed_official 227:7bd0639b8911 264 timeout = FLAG_TIMEOUT;
mbed_official 497:d54623194236 265 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
mbed_official 497:d54623194236 266 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
mbed_official 497:d54623194236 267 if ((timeout--) == 0) {
mbed_official 126:549ba18ddd81 268 return 0;
mbed_official 126:549ba18ddd81 269 }
mbed_official 126:549ba18ddd81 270 }
mbed_official 126:549ba18ddd81 271
mbed_official 126:549ba18ddd81 272 return 1;
mbed_official 126:549ba18ddd81 273 }
mbed_official 126:549ba18ddd81 274
mbed_official 497:d54623194236 275 void i2c_reset(i2c_t *obj)
mbed_official 497:d54623194236 276 {
mbed_official 497:d54623194236 277 int timeout;
mbed_official 497:d54623194236 278
mbed_official 497:d54623194236 279 // Wait before reset
mbed_official 497:d54623194236 280 timeout = LONG_TIMEOUT;
mbed_official 497:d54623194236 281 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 497:d54623194236 282
mbed_official 227:7bd0639b8911 283 if (obj->i2c == I2C_1) {
mbed_official 497:d54623194236 284 __I2C1_FORCE_RESET();
mbed_official 497:d54623194236 285 __I2C1_RELEASE_RESET();
mbed_official 126:549ba18ddd81 286 }
mbed_official 126:549ba18ddd81 287 if (obj->i2c == I2C_2) {
mbed_official 497:d54623194236 288 __I2C2_FORCE_RESET();
mbed_official 497:d54623194236 289 __I2C2_RELEASE_RESET();
mbed_official 126:549ba18ddd81 290 }
mbed_official 126:549ba18ddd81 291 }
mbed_official 126:549ba18ddd81 292
mbed_official 126:549ba18ddd81 293 #if DEVICE_I2CSLAVE
mbed_official 126:549ba18ddd81 294
mbed_official 497:d54623194236 295 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 497:d54623194236 296 {
mbed_official 126:549ba18ddd81 297 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 497:d54623194236 298 uint16_t tmpreg = 0;
mbed_official 126:549ba18ddd81 299
mbed_official 126:549ba18ddd81 300 // Get the old register value
mbed_official 126:549ba18ddd81 301 tmpreg = i2c->OAR1;
mbed_official 126:549ba18ddd81 302 // Reset address bits
mbed_official 126:549ba18ddd81 303 tmpreg &= 0xFC00;
mbed_official 126:549ba18ddd81 304 // Set new address
mbed_official 126:549ba18ddd81 305 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 126:549ba18ddd81 306 // Store the new register value
mbed_official 126:549ba18ddd81 307 i2c->OAR1 = tmpreg;
mbed_official 126:549ba18ddd81 308 }
mbed_official 126:549ba18ddd81 309
mbed_official 497:d54623194236 310 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 497:d54623194236 311 {
mbed_official 497:d54623194236 312 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 497:d54623194236 313 if (enable_slave) {
mbed_official 497:d54623194236 314 obj->slave = 1;
mbed_official 497:d54623194236 315 /* Enable Address Acknowledge */
mbed_official 497:d54623194236 316 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 497:d54623194236 317 }
mbed_official 126:549ba18ddd81 318 }
mbed_official 126:549ba18ddd81 319
mbed_official 126:549ba18ddd81 320 // See I2CSlave.h
mbed_official 126:549ba18ddd81 321 #define NoData 0 // the slave has not been addressed
mbed_official 126:549ba18ddd81 322 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 126:549ba18ddd81 323 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 126:549ba18ddd81 324 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 126:549ba18ddd81 325
mbed_official 497:d54623194236 326 int i2c_slave_receive(i2c_t *obj)
mbed_official 497:d54623194236 327 {
mbed_official 497:d54623194236 328 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 497:d54623194236 329 int retValue = NoData;
mbed_official 497:d54623194236 330
mbed_official 497:d54623194236 331 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 497:d54623194236 332 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 497:d54623194236 333 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1) {
mbed_official 497:d54623194236 334 retValue = ReadAddressed;
mbed_official 497:d54623194236 335 } else {
mbed_official 497:d54623194236 336 retValue = WriteAddressed;
mbed_official 497:d54623194236 337 }
mbed_official 497:d54623194236 338 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 497:d54623194236 339 }
mbed_official 126:549ba18ddd81 340 }
mbed_official 126:549ba18ddd81 341
mbed_official 497:d54623194236 342 return (retValue);
mbed_official 497:d54623194236 343 }
mbed_official 126:549ba18ddd81 344
mbed_official 497:d54623194236 345 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 497:d54623194236 346 {
mbed_official 497:d54623194236 347 uint32_t Timeout;
mbed_official 497:d54623194236 348 int size = 0;
mbed_official 497:d54623194236 349
mbed_official 497:d54623194236 350 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 497:d54623194236 351
mbed_official 497:d54623194236 352 while (length > 0) {
mbed_official 497:d54623194236 353 // Wait until RXNE flag is set
mbed_official 497:d54623194236 354 // Wait until the byte is received
mbed_official 497:d54623194236 355 Timeout = FLAG_TIMEOUT;
mbed_official 497:d54623194236 356 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 497:d54623194236 357 Timeout--;
mbed_official 497:d54623194236 358 if (Timeout == 0) {
mbed_official 497:d54623194236 359 return -1;
mbed_official 497:d54623194236 360 }
mbed_official 126:549ba18ddd81 361 }
mbed_official 126:549ba18ddd81 362
mbed_official 497:d54623194236 363 // Read data
mbed_official 497:d54623194236 364 (*data++) = I2cHandle.Instance->DR;
mbed_official 497:d54623194236 365 length--;
mbed_official 497:d54623194236 366 size++;
mbed_official 497:d54623194236 367
mbed_official 497:d54623194236 368 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 497:d54623194236 369 // Read data
mbed_official 497:d54623194236 370 (*data++) = I2cHandle.Instance->DR;
mbed_official 497:d54623194236 371 length--;
mbed_official 497:d54623194236 372 size++;
mbed_official 497:d54623194236 373 }
mbed_official 497:d54623194236 374 }
mbed_official 497:d54623194236 375
mbed_official 497:d54623194236 376 // Wait until STOP flag is set
mbed_official 497:d54623194236 377 Timeout = FLAG_TIMEOUT;
mbed_official 497:d54623194236 378 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 497:d54623194236 379 Timeout--;
mbed_official 497:d54623194236 380 if (Timeout == 0) {
mbed_official 497:d54623194236 381 return -1;
mbed_official 497:d54623194236 382 }
mbed_official 497:d54623194236 383 }
mbed_official 497:d54623194236 384
mbed_official 497:d54623194236 385 // Clear STOP flag
mbed_official 497:d54623194236 386 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
mbed_official 497:d54623194236 387
mbed_official 497:d54623194236 388 // Wait until BUSY flag is reset
mbed_official 497:d54623194236 389 Timeout = FLAG_TIMEOUT;
mbed_official 497:d54623194236 390 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 497:d54623194236 391 Timeout--;
mbed_official 497:d54623194236 392 if (Timeout == 0) {
mbed_official 497:d54623194236 393 return -1;
mbed_official 497:d54623194236 394 }
mbed_official 497:d54623194236 395 }
mbed_official 497:d54623194236 396
mbed_official 497:d54623194236 397 return size;
mbed_official 126:549ba18ddd81 398 }
mbed_official 126:549ba18ddd81 399
mbed_official 497:d54623194236 400 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 497:d54623194236 401 {
mbed_official 497:d54623194236 402 uint32_t Timeout;
mbed_official 497:d54623194236 403 int size = 0;
mbed_official 497:d54623194236 404
mbed_official 497:d54623194236 405 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 497:d54623194236 406
mbed_official 497:d54623194236 407 while (length > 0) {
mbed_official 497:d54623194236 408 // Wait until TXE flag is set
mbed_official 497:d54623194236 409 Timeout = FLAG_TIMEOUT;
mbed_official 497:d54623194236 410 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
mbed_official 497:d54623194236 411 Timeout--;
mbed_official 497:d54623194236 412 if (Timeout == 0) {
mbed_official 497:d54623194236 413 return -1;
mbed_official 497:d54623194236 414 }
mbed_official 497:d54623194236 415 }
mbed_official 497:d54623194236 416
mbed_official 497:d54623194236 417 // Write data
mbed_official 497:d54623194236 418 I2cHandle.Instance->DR = (*data++);
mbed_official 497:d54623194236 419 length--;
mbed_official 497:d54623194236 420 size++;
mbed_official 497:d54623194236 421
mbed_official 497:d54623194236 422 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 497:d54623194236 423 // Write data to DR
mbed_official 497:d54623194236 424 I2cHandle.Instance->DR = (*data++);
mbed_official 497:d54623194236 425 length--;
mbed_official 497:d54623194236 426 size++;
mbed_official 497:d54623194236 427 }
mbed_official 126:549ba18ddd81 428 }
mbed_official 497:d54623194236 429
mbed_official 497:d54623194236 430 // Wait until AF flag is set
mbed_official 497:d54623194236 431 Timeout = FLAG_TIMEOUT;
mbed_official 497:d54623194236 432 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
mbed_official 497:d54623194236 433 Timeout--;
mbed_official 497:d54623194236 434 if (Timeout == 0) {
mbed_official 497:d54623194236 435 return -1;
mbed_official 497:d54623194236 436 }
mbed_official 497:d54623194236 437 }
mbed_official 497:d54623194236 438
mbed_official 497:d54623194236 439 // Clear AF flag
mbed_official 497:d54623194236 440 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 497:d54623194236 441
mbed_official 497:d54623194236 442 // Wait until BUSY flag is reset
mbed_official 497:d54623194236 443 Timeout = FLAG_TIMEOUT;
mbed_official 497:d54623194236 444 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 497:d54623194236 445 Timeout--;
mbed_official 497:d54623194236 446 if (Timeout == 0) {
mbed_official 497:d54623194236 447 return -1;
mbed_official 497:d54623194236 448 }
mbed_official 497:d54623194236 449 }
mbed_official 497:d54623194236 450
mbed_official 497:d54623194236 451 return size;
mbed_official 126:549ba18ddd81 452 }
mbed_official 126:549ba18ddd81 453
mbed_official 126:549ba18ddd81 454
mbed_official 126:549ba18ddd81 455 #endif // DEVICE_I2CSLAVE
mbed_official 126:549ba18ddd81 456
mbed_official 126:549ba18ddd81 457 #endif // DEVICE_I2C