shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/i2c_api.c@181:a4cbdfbbd2f4, 2014-05-07 (annotated)

Committer:
mbed_official
Date:
Wed May 07 13:15:08 2014 +0100
Revision:
181:a4cbdfbbd2f4
Parent:
172:2f4f8c56b261
Child:
183:46ae3190e86c
Synchronized with git revision 7751e759576c6fd68deccb81ea82bac19ed41745



Full URL: https://github.com/mbedmicro/mbed/commit/7751e759576c6fd68deccb81ea82bac19ed41745/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 87:085cde657901 1 /* mbed Microcontroller Library
mbed_official 87:085cde657901 2 *******************************************************************************
mbed_official 87:085cde657901 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 87:085cde657901 4 * All rights reserved.
mbed_official 87:085cde657901 5 *
mbed_official 87:085cde657901 6 * Redistribution and use in source and binary forms, with or without
mbed_official 87:085cde657901 7 * modification, are permitted provided that the following conditions are met:
mbed_official 87:085cde657901 8 *
mbed_official 87:085cde657901 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 87:085cde657901 10 * this list of conditions and the following disclaimer.
mbed_official 87:085cde657901 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 87:085cde657901 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 87:085cde657901 13 * and/or other materials provided with the distribution.
mbed_official 87:085cde657901 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 87:085cde657901 15 * may be used to endorse or promote products derived from this software
mbed_official 87:085cde657901 16 * without specific prior written permission.
mbed_official 87:085cde657901 17 *
mbed_official 87:085cde657901 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 87:085cde657901 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 87:085cde657901 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 87:085cde657901 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 87:085cde657901 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 87:085cde657901 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 87:085cde657901 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 87:085cde657901 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 87:085cde657901 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 87:085cde657901 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 87:085cde657901 28 *******************************************************************************
mbed_official 87:085cde657901 29 */
mbed_official 87:085cde657901 30 #include "i2c_api.h"
mbed_official 87:085cde657901 31
mbed_official 87:085cde657901 32 #if DEVICE_I2C
mbed_official 87:085cde657901 33
mbed_official 87:085cde657901 34 #include "cmsis.h"
mbed_official 87:085cde657901 35 #include "pinmap.h"
mbed_official 87:085cde657901 36 #include "error.h"
mbed_official 87:085cde657901 37
mbed_official 87:085cde657901 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 172:2f4f8c56b261 39 not based on accurate values, they just guarantee that the application will
mbed_official 172:2f4f8c56b261 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 87:085cde657901 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 87:085cde657901 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 87:085cde657901 43
mbed_official 87:085cde657901 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 115:4f0cb9cdc478 45 {PB_3, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF9_I2C2)},
mbed_official 115:4f0cb9cdc478 46 {PB_4, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF9_I2C3)},
mbed_official 125:23cc3068a9e4 47 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 125:23cc3068a9e4 48 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 125:23cc3068a9e4 49 {PC_9, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
mbed_official 87:085cde657901 50 {NC, NC, 0}
mbed_official 87:085cde657901 51 };
mbed_official 87:085cde657901 52
mbed_official 87:085cde657901 53 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 125:23cc3068a9e4 54 {PA_8, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
mbed_official 125:23cc3068a9e4 55 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 88:81f18c97d490 56 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 115:4f0cb9cdc478 57 {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 87:085cde657901 58 {NC, NC, 0}
mbed_official 87:085cde657901 59 };
mbed_official 87:085cde657901 60
mbed_official 87:085cde657901 61 I2C_HandleTypeDef I2cHandle;
mbed_official 87:085cde657901 62
mbed_official 172:2f4f8c56b261 63 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 87:085cde657901 64 // Determine the I2C to use
mbed_official 87:085cde657901 65 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 87:085cde657901 66 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 87:085cde657901 67
mbed_official 87:085cde657901 68 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 172:2f4f8c56b261 69
mbed_official 87:085cde657901 70 if (obj->i2c == (I2CName)NC) {
mbed_official 87:085cde657901 71 error("I2C error: pinout mapping failed.");
mbed_official 87:085cde657901 72 }
mbed_official 87:085cde657901 73
mbed_official 87:085cde657901 74 // Enable I2C clock
mbed_official 172:2f4f8c56b261 75 if (obj->i2c == I2C_1) {
mbed_official 87:085cde657901 76 __I2C1_CLK_ENABLE();
mbed_official 87:085cde657901 77 }
mbed_official 115:4f0cb9cdc478 78 if (obj->i2c == I2C_2) {
mbed_official 115:4f0cb9cdc478 79 __I2C2_CLK_ENABLE();
mbed_official 115:4f0cb9cdc478 80 }
mbed_official 115:4f0cb9cdc478 81 if (obj->i2c == I2C_3) {
mbed_official 115:4f0cb9cdc478 82 __I2C3_CLK_ENABLE();
mbed_official 115:4f0cb9cdc478 83 }
mbed_official 87:085cde657901 84
mbed_official 87:085cde657901 85 // Configure I2C pins
mbed_official 87:085cde657901 86 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 87:085cde657901 87 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 87:085cde657901 88 pin_mode(sda, OpenDrain);
mbed_official 87:085cde657901 89 pin_mode(scl, OpenDrain);
mbed_official 172:2f4f8c56b261 90
mbed_official 87:085cde657901 91 // Reset to clear pending flags if any
mbed_official 87:085cde657901 92 i2c_reset(obj);
mbed_official 172:2f4f8c56b261 93
mbed_official 87:085cde657901 94 // I2C configuration
mbed_official 172:2f4f8c56b261 95 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 181:a4cbdfbbd2f4 96
mbed_official 181:a4cbdfbbd2f4 97 // I2C master by default
mbed_official 181:a4cbdfbbd2f4 98 obj->slave = 0;
mbed_official 87:085cde657901 99 }
mbed_official 87:085cde657901 100
mbed_official 87:085cde657901 101 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 87:085cde657901 102 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 172:2f4f8c56b261 103
mbed_official 87:085cde657901 104 if ((hz != 0) && (hz <= 400000)) {
mbed_official 87:085cde657901 105 // I2C configuration
mbed_official 87:085cde657901 106 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 87:085cde657901 107 I2cHandle.Init.ClockSpeed = hz;
mbed_official 87:085cde657901 108 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 87:085cde657901 109 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
mbed_official 87:085cde657901 110 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 87:085cde657901 111 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 87:085cde657901 112 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 87:085cde657901 113 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 87:085cde657901 114 HAL_I2C_Init(&I2cHandle);
mbed_official 181:a4cbdfbbd2f4 115 if(obj->slave) {
mbed_official 181:a4cbdfbbd2f4 116 /* Enable Address Acknowledge */
mbed_official 181:a4cbdfbbd2f4 117 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 181:a4cbdfbbd2f4 118 }
mbed_official 87:085cde657901 119 }
mbed_official 87:085cde657901 120 else {
mbed_official 87:085cde657901 121 error("I2C error: frequency setting failed (max 400kHz).");
mbed_official 87:085cde657901 122 }
mbed_official 87:085cde657901 123 }
mbed_official 87:085cde657901 124
mbed_official 87:085cde657901 125 inline int i2c_start(i2c_t *obj) {
mbed_official 87:085cde657901 126 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 127 int timeout;
mbed_official 172:2f4f8c56b261 128
mbed_official 87:085cde657901 129 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 172:2f4f8c56b261 130
mbed_official 87:085cde657901 131 // Clear Acknowledge failure flag
mbed_official 87:085cde657901 132 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 172:2f4f8c56b261 133
mbed_official 87:085cde657901 134 // Generate the START condition
mbed_official 87:085cde657901 135 i2c->CR1 |= I2C_CR1_START;
mbed_official 172:2f4f8c56b261 136
mbed_official 87:085cde657901 137 // Wait the START condition has been correctly sent
mbed_official 87:085cde657901 138 timeout = FLAG_TIMEOUT;
mbed_official 87:085cde657901 139 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 172:2f4f8c56b261 140 if ((timeout--) == 0) {
mbed_official 172:2f4f8c56b261 141 return 1;
mbed_official 172:2f4f8c56b261 142 }
mbed_official 87:085cde657901 143 }
mbed_official 172:2f4f8c56b261 144
mbed_official 87:085cde657901 145 return 0;
mbed_official 87:085cde657901 146 }
mbed_official 87:085cde657901 147
mbed_official 87:085cde657901 148 inline int i2c_stop(i2c_t *obj) {
mbed_official 87:085cde657901 149 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 172:2f4f8c56b261 150
mbed_official 87:085cde657901 151 // Generate the STOP condition
mbed_official 87:085cde657901 152 i2c->CR1 |= I2C_CR1_STOP;
mbed_official 87:085cde657901 153
mbed_official 87:085cde657901 154 return 0;
mbed_official 87:085cde657901 155 }
mbed_official 87:085cde657901 156
mbed_official 172:2f4f8c56b261 157 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 87:085cde657901 158 if (length == 0) return 0;
mbed_official 172:2f4f8c56b261 159
mbed_official 87:085cde657901 160 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 161
mbed_official 87:085cde657901 162 // Reception process with 5 seconds timeout
mbed_official 87:085cde657901 163 if (HAL_I2C_Master_Receive(&I2cHandle, (uint16_t)address, (uint8_t *)data, length, 5000) != HAL_OK) {
mbed_official 87:085cde657901 164 return 0; // Error
mbed_official 87:085cde657901 165 }
mbed_official 87:085cde657901 166
mbed_official 87:085cde657901 167 return length;
mbed_official 87:085cde657901 168 }
mbed_official 87:085cde657901 169
mbed_official 87:085cde657901 170 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 87:085cde657901 171 if (length == 0) return 0;
mbed_official 172:2f4f8c56b261 172
mbed_official 87:085cde657901 173 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 174
mbed_official 87:085cde657901 175 // Transmission process with 5 seconds timeout
mbed_official 87:085cde657901 176 if (HAL_I2C_Master_Transmit(&I2cHandle, (uint16_t)address, (uint8_t *)data, length, 5000) != HAL_OK) {
mbed_official 87:085cde657901 177 return 0; // Error
mbed_official 87:085cde657901 178 }
mbed_official 172:2f4f8c56b261 179
mbed_official 87:085cde657901 180 return length;
mbed_official 87:085cde657901 181 }
mbed_official 87:085cde657901 182
mbed_official 87:085cde657901 183 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 87:085cde657901 184 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 185 int timeout;
mbed_official 172:2f4f8c56b261 186
mbed_official 87:085cde657901 187 if (last) {
mbed_official 87:085cde657901 188 // Don't acknowledge the last byte
mbed_official 87:085cde657901 189 i2c->CR1 &= ~I2C_CR1_ACK;
mbed_official 87:085cde657901 190 } else {
mbed_official 87:085cde657901 191 // Acknowledge the byte
mbed_official 87:085cde657901 192 i2c->CR1 |= I2C_CR1_ACK;
mbed_official 87:085cde657901 193 }
mbed_official 87:085cde657901 194
mbed_official 87:085cde657901 195 // Wait until the byte is received
mbed_official 87:085cde657901 196 timeout = FLAG_TIMEOUT;
mbed_official 87:085cde657901 197 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 172:2f4f8c56b261 198 if ((timeout--) == 0) {
mbed_official 172:2f4f8c56b261 199 return 0;
mbed_official 172:2f4f8c56b261 200 }
mbed_official 87:085cde657901 201 }
mbed_official 172:2f4f8c56b261 202
mbed_official 87:085cde657901 203 return (int)i2c->DR;
mbed_official 87:085cde657901 204 }
mbed_official 87:085cde657901 205
mbed_official 87:085cde657901 206 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 87:085cde657901 207 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 208 int timeout;
mbed_official 87:085cde657901 209
mbed_official 87:085cde657901 210 i2c->DR = (uint8_t)data;
mbed_official 87:085cde657901 211
mbed_official 87:085cde657901 212 // Wait until the byte is transmitted
mbed_official 172:2f4f8c56b261 213 timeout = FLAG_TIMEOUT;
mbed_official 87:085cde657901 214 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
mbed_official 87:085cde657901 215 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
mbed_official 87:085cde657901 216 if ((timeout--) == 0) {
mbed_official 87:085cde657901 217 return 0;
mbed_official 87:085cde657901 218 }
mbed_official 87:085cde657901 219 }
mbed_official 172:2f4f8c56b261 220
mbed_official 87:085cde657901 221 return 1;
mbed_official 87:085cde657901 222 }
mbed_official 87:085cde657901 223
mbed_official 87:085cde657901 224 void i2c_reset(i2c_t *obj) {
mbed_official 172:2f4f8c56b261 225 if (obj->i2c == I2C_1) {
mbed_official 87:085cde657901 226 __I2C1_FORCE_RESET();
mbed_official 87:085cde657901 227 __I2C1_RELEASE_RESET();
mbed_official 87:085cde657901 228 }
mbed_official 115:4f0cb9cdc478 229 if (obj->i2c == I2C_2) {
mbed_official 115:4f0cb9cdc478 230 __I2C2_FORCE_RESET();
mbed_official 115:4f0cb9cdc478 231 __I2C2_RELEASE_RESET();
mbed_official 115:4f0cb9cdc478 232 }
mbed_official 115:4f0cb9cdc478 233 if (obj->i2c == I2C_3) {
mbed_official 115:4f0cb9cdc478 234 __I2C3_FORCE_RESET();
mbed_official 115:4f0cb9cdc478 235 __I2C3_RELEASE_RESET();
mbed_official 115:4f0cb9cdc478 236 }
mbed_official 87:085cde657901 237 }
mbed_official 87:085cde657901 238
mbed_official 87:085cde657901 239 #if DEVICE_I2CSLAVE
mbed_official 87:085cde657901 240
mbed_official 87:085cde657901 241 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 87:085cde657901 242 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 243 uint16_t tmpreg = 0;
mbed_official 87:085cde657901 244
mbed_official 87:085cde657901 245 // Get the old register value
mbed_official 87:085cde657901 246 tmpreg = i2c->OAR1;
mbed_official 87:085cde657901 247 // Reset address bits
mbed_official 87:085cde657901 248 tmpreg &= 0xFC00;
mbed_official 87:085cde657901 249 // Set new address
mbed_official 87:085cde657901 250 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 87:085cde657901 251 // Store the new register value
mbed_official 87:085cde657901 252 i2c->OAR1 = tmpreg;
mbed_official 87:085cde657901 253 }
mbed_official 87:085cde657901 254
mbed_official 87:085cde657901 255 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 181:a4cbdfbbd2f4 256 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 257 if(enable_slave) {
mbed_official 181:a4cbdfbbd2f4 258 obj->slave = 1;
mbed_official 181:a4cbdfbbd2f4 259 /* Enable Address Acknowledge */
mbed_official 181:a4cbdfbbd2f4 260 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 181:a4cbdfbbd2f4 261 }
mbed_official 87:085cde657901 262 }
mbed_official 87:085cde657901 263
mbed_official 87:085cde657901 264 // See I2CSlave.h
mbed_official 87:085cde657901 265 #define NoData 0 // the slave has not been addressed
mbed_official 87:085cde657901 266 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 87:085cde657901 267 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 87:085cde657901 268 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 87:085cde657901 269
mbed_official 87:085cde657901 270 int i2c_slave_receive(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 271 int retValue = NoData;
mbed_official 181:a4cbdfbbd2f4 272
mbed_official 181:a4cbdfbbd2f4 273 if(__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 181:a4cbdfbbd2f4 274 if(__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 181:a4cbdfbbd2f4 275 if(__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1)
mbed_official 181:a4cbdfbbd2f4 276 retValue = ReadAddressed;
mbed_official 181:a4cbdfbbd2f4 277 else
mbed_official 181:a4cbdfbbd2f4 278 retValue = WriteAddressed;
mbed_official 181:a4cbdfbbd2f4 279
mbed_official 181:a4cbdfbbd2f4 280 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 181:a4cbdfbbd2f4 281 }
mbed_official 181:a4cbdfbbd2f4 282 }
mbed_official 181:a4cbdfbbd2f4 283
mbed_official 181:a4cbdfbbd2f4 284 return(retValue);
mbed_official 87:085cde657901 285 }
mbed_official 87:085cde657901 286
mbed_official 87:085cde657901 287 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 181:a4cbdfbbd2f4 288 uint32_t Timeout;
mbed_official 181:a4cbdfbbd2f4 289 int size = 0;
mbed_official 87:085cde657901 290 if (length == 0) return 0;
mbed_official 172:2f4f8c56b261 291
mbed_official 87:085cde657901 292 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 293
mbed_official 181:a4cbdfbbd2f4 294 while(length > 0)
mbed_official 181:a4cbdfbbd2f4 295 {
mbed_official 181:a4cbdfbbd2f4 296 /* Wait until RXNE flag is set */
mbed_official 181:a4cbdfbbd2f4 297 // Wait until the byte is received
mbed_official 181:a4cbdfbbd2f4 298 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 299 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 300 Timeout--;
mbed_official 181:a4cbdfbbd2f4 301 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 302 return 0;
mbed_official 181:a4cbdfbbd2f4 303 }
mbed_official 181:a4cbdfbbd2f4 304 }
mbed_official 181:a4cbdfbbd2f4 305
mbed_official 181:a4cbdfbbd2f4 306 /* Read data from DR */
mbed_official 181:a4cbdfbbd2f4 307 (*data++) = I2cHandle.Instance->DR;
mbed_official 181:a4cbdfbbd2f4 308 length--;
mbed_official 181:a4cbdfbbd2f4 309 size++;
mbed_official 181:a4cbdfbbd2f4 310
mbed_official 181:a4cbdfbbd2f4 311 if((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)){
mbed_official 181:a4cbdfbbd2f4 312 /* Read data from DR */
mbed_official 181:a4cbdfbbd2f4 313 (*data++) = I2cHandle.Instance->DR;
mbed_official 181:a4cbdfbbd2f4 314 length--;
mbed_official 181:a4cbdfbbd2f4 315 size++;
mbed_official 181:a4cbdfbbd2f4 316 }
mbed_official 87:085cde657901 317 }
mbed_official 87:085cde657901 318
mbed_official 181:a4cbdfbbd2f4 319 /* Wait until STOP flag is set */
mbed_official 181:a4cbdfbbd2f4 320 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 321 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 181:a4cbdfbbd2f4 322 Timeout--;
mbed_official 181:a4cbdfbbd2f4 323 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 324 return 0;
mbed_official 181:a4cbdfbbd2f4 325 }
mbed_official 181:a4cbdfbbd2f4 326 }
mbed_official 181:a4cbdfbbd2f4 327
mbed_official 181:a4cbdfbbd2f4 328 /* Clear STOP flag */
mbed_official 181:a4cbdfbbd2f4 329 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
mbed_official 181:a4cbdfbbd2f4 330
mbed_official 181:a4cbdfbbd2f4 331 /* Wait until BUSY flag is reset */
mbed_official 181:a4cbdfbbd2f4 332 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 333 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 181:a4cbdfbbd2f4 334 Timeout--;
mbed_official 181:a4cbdfbbd2f4 335 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 336 return 0;
mbed_official 181:a4cbdfbbd2f4 337 }
mbed_official 181:a4cbdfbbd2f4 338 }
mbed_official 181:a4cbdfbbd2f4 339
mbed_official 181:a4cbdfbbd2f4 340 return size;
mbed_official 87:085cde657901 341 }
mbed_official 87:085cde657901 342
mbed_official 87:085cde657901 343 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 181:a4cbdfbbd2f4 344 uint32_t Timeout;
mbed_official 181:a4cbdfbbd2f4 345 int size = 0;
mbed_official 87:085cde657901 346 if (length == 0) return 0;
mbed_official 172:2f4f8c56b261 347
mbed_official 87:085cde657901 348 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 87:085cde657901 349
mbed_official 181:a4cbdfbbd2f4 350 while(length > 0)
mbed_official 181:a4cbdfbbd2f4 351 {
mbed_official 181:a4cbdfbbd2f4 352 /* Wait until TXE flag is set */
mbed_official 181:a4cbdfbbd2f4 353 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 354 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 355 Timeout--;
mbed_official 181:a4cbdfbbd2f4 356 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 357 return 0;
mbed_official 181:a4cbdfbbd2f4 358 }
mbed_official 181:a4cbdfbbd2f4 359 }
mbed_official 181:a4cbdfbbd2f4 360
mbed_official 181:a4cbdfbbd2f4 361
mbed_official 181:a4cbdfbbd2f4 362 /* Write data to DR */
mbed_official 181:a4cbdfbbd2f4 363 I2cHandle.Instance->DR = (*data++);
mbed_official 181:a4cbdfbbd2f4 364 length--;
mbed_official 181:a4cbdfbbd2f4 365 size++;
mbed_official 181:a4cbdfbbd2f4 366
mbed_official 181:a4cbdfbbd2f4 367 if((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0))
mbed_official 181:a4cbdfbbd2f4 368 {
mbed_official 181:a4cbdfbbd2f4 369 /* Write data to DR */
mbed_official 181:a4cbdfbbd2f4 370 I2cHandle.Instance->DR = (*data++);
mbed_official 181:a4cbdfbbd2f4 371 length--;
mbed_official 181:a4cbdfbbd2f4 372 size++;
mbed_official 181:a4cbdfbbd2f4 373 }
mbed_official 181:a4cbdfbbd2f4 374 }
mbed_official 181:a4cbdfbbd2f4 375
mbed_official 181:a4cbdfbbd2f4 376 /* Wait until AF flag is set */
mbed_official 181:a4cbdfbbd2f4 377 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 378 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
mbed_official 181:a4cbdfbbd2f4 379 Timeout--;
mbed_official 181:a4cbdfbbd2f4 380 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 381 return 0;
mbed_official 181:a4cbdfbbd2f4 382 }
mbed_official 181:a4cbdfbbd2f4 383 }
mbed_official 181:a4cbdfbbd2f4 384
mbed_official 181:a4cbdfbbd2f4 385
mbed_official 181:a4cbdfbbd2f4 386 /* Clear AF flag */
mbed_official 181:a4cbdfbbd2f4 387 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 181:a4cbdfbbd2f4 388
mbed_official 181:a4cbdfbbd2f4 389
mbed_official 181:a4cbdfbbd2f4 390 /* Wait until BUSY flag is reset */
mbed_official 181:a4cbdfbbd2f4 391 Timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 392 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 181:a4cbdfbbd2f4 393 Timeout--;
mbed_official 181:a4cbdfbbd2f4 394 if (Timeout == 0) {
mbed_official 181:a4cbdfbbd2f4 395 return 0;
mbed_official 181:a4cbdfbbd2f4 396 }
mbed_official 87:085cde657901 397 }
mbed_official 87:085cde657901 398
mbed_official 181:a4cbdfbbd2f4 399 I2cHandle.State = HAL_I2C_STATE_READY;
mbed_official 181:a4cbdfbbd2f4 400
mbed_official 181:a4cbdfbbd2f4 401 /* Process Unlocked */
mbed_official 181:a4cbdfbbd2f4 402 __HAL_UNLOCK(&I2cHandle);
mbed_official 181:a4cbdfbbd2f4 403
mbed_official 181:a4cbdfbbd2f4 404 return size;
mbed_official 87:085cde657901 405 }
mbed_official 87:085cde657901 406
mbed_official 87:085cde657901 407
mbed_official 87:085cde657901 408 #endif // DEVICE_I2CSLAVE
mbed_official 87:085cde657901 409
mbed_official 87:085cde657901 410 #endif // DEVICE_I2C