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_DISCO_F407VG/i2c_api.c@133:d4dda5c437f0, 2014-03-24 (annotated)

Committer:
mbed_official
Date:
Mon Mar 24 17:45:07 2014 +0000
Revision:
133:d4dda5c437f0
Child:
227:7bd0639b8911
Synchronized with git revision 47b961246bed973fe4cb8932781ffc8025b78a61



Full URL: https://github.com/mbedmicro/mbed/commit/47b961246bed973fe4cb8932781ffc8025b78a61/



[STM32F4-Discovery (STM32F407VG)] initial port

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 133:d4dda5c437f0 1 /* mbed Microcontroller Library
mbed_official 133:d4dda5c437f0 2 *******************************************************************************
mbed_official 133:d4dda5c437f0 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 133:d4dda5c437f0 4 * All rights reserved.
mbed_official 133:d4dda5c437f0 5 *
mbed_official 133:d4dda5c437f0 6 * Redistribution and use in source and binary forms, with or without
mbed_official 133:d4dda5c437f0 7 * modification, are permitted provided that the following conditions are met:
mbed_official 133:d4dda5c437f0 8 *
mbed_official 133:d4dda5c437f0 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 133:d4dda5c437f0 10 * this list of conditions and the following disclaimer.
mbed_official 133:d4dda5c437f0 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 133:d4dda5c437f0 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 133:d4dda5c437f0 13 * and/or other materials provided with the distribution.
mbed_official 133:d4dda5c437f0 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 133:d4dda5c437f0 15 * may be used to endorse or promote products derived from this software
mbed_official 133:d4dda5c437f0 16 * without specific prior written permission.
mbed_official 133:d4dda5c437f0 17 *
mbed_official 133:d4dda5c437f0 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 133:d4dda5c437f0 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 133:d4dda5c437f0 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 133:d4dda5c437f0 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 133:d4dda5c437f0 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 133:d4dda5c437f0 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 133:d4dda5c437f0 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 133:d4dda5c437f0 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 133:d4dda5c437f0 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 133:d4dda5c437f0 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 133:d4dda5c437f0 28 *******************************************************************************
mbed_official 133:d4dda5c437f0 29 */
mbed_official 133:d4dda5c437f0 30 #include "i2c_api.h"
mbed_official 133:d4dda5c437f0 31
mbed_official 133:d4dda5c437f0 32 #if DEVICE_I2C
mbed_official 133:d4dda5c437f0 33
mbed_official 133:d4dda5c437f0 34 #include "cmsis.h"
mbed_official 133:d4dda5c437f0 35 #include "pinmap.h"
mbed_official 133:d4dda5c437f0 36 #include "error.h"
mbed_official 133:d4dda5c437f0 37 #include "stm32f4xx_hal.h"
mbed_official 133:d4dda5c437f0 38
mbed_official 133:d4dda5c437f0 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 133:d4dda5c437f0 40 not based on accurate values, they just guarantee that the application will
mbed_official 133:d4dda5c437f0 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 133:d4dda5c437f0 42 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 133:d4dda5c437f0 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 133:d4dda5c437f0 44
mbed_official 133:d4dda5c437f0 45 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 133:d4dda5c437f0 46 {PB_11, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 133:d4dda5c437f0 47 {PF_0 , I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 133:d4dda5c437f0 48 {PH_5 , I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 133:d4dda5c437f0 49 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 133:d4dda5c437f0 50 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 133:d4dda5c437f0 51 {PC_9, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
mbed_official 133:d4dda5c437f0 52 {PH_8, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
mbed_official 133:d4dda5c437f0 53 {NC, NC, 0}
mbed_official 133:d4dda5c437f0 54 };
mbed_official 133:d4dda5c437f0 55
mbed_official 133:d4dda5c437f0 56 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 133:d4dda5c437f0 57 {PA_8, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
mbed_official 133:d4dda5c437f0 58 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 133:d4dda5c437f0 59 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 133:d4dda5c437f0 60 {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 133:d4dda5c437f0 61 {PF_1 , I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 133:d4dda5c437f0 62 {PH_4 , I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 133:d4dda5c437f0 63 {NC, NC, 0}
mbed_official 133:d4dda5c437f0 64 };
mbed_official 133:d4dda5c437f0 65
mbed_official 133:d4dda5c437f0 66 I2C_HandleTypeDef I2cHandle;
mbed_official 133:d4dda5c437f0 67
mbed_official 133:d4dda5c437f0 68 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 133:d4dda5c437f0 69 // Determine the I2C to use
mbed_official 133:d4dda5c437f0 70 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 133:d4dda5c437f0 71 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 133:d4dda5c437f0 72
mbed_official 133:d4dda5c437f0 73 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 133:d4dda5c437f0 74
mbed_official 133:d4dda5c437f0 75 if (obj->i2c == (I2CName)NC) {
mbed_official 133:d4dda5c437f0 76 error("I2C error: pinout mapping failed.");
mbed_official 133:d4dda5c437f0 77 }
mbed_official 133:d4dda5c437f0 78
mbed_official 133:d4dda5c437f0 79 // Enable I2C clock
mbed_official 133:d4dda5c437f0 80 if (obj->i2c == I2C_1) {
mbed_official 133:d4dda5c437f0 81 __I2C1_CLK_ENABLE();
mbed_official 133:d4dda5c437f0 82 }
mbed_official 133:d4dda5c437f0 83 if (obj->i2c == I2C_2) {
mbed_official 133:d4dda5c437f0 84 __I2C2_CLK_ENABLE();
mbed_official 133:d4dda5c437f0 85 }
mbed_official 133:d4dda5c437f0 86 if (obj->i2c == I2C_3) {
mbed_official 133:d4dda5c437f0 87 __I2C3_CLK_ENABLE();
mbed_official 133:d4dda5c437f0 88 }
mbed_official 133:d4dda5c437f0 89
mbed_official 133:d4dda5c437f0 90 // Configure I2C pins
mbed_official 133:d4dda5c437f0 91 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 133:d4dda5c437f0 92 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 133:d4dda5c437f0 93 pin_mode(sda, OpenDrain);
mbed_official 133:d4dda5c437f0 94 pin_mode(scl, OpenDrain);
mbed_official 133:d4dda5c437f0 95
mbed_official 133:d4dda5c437f0 96 // Reset to clear pending flags if any
mbed_official 133:d4dda5c437f0 97 i2c_reset(obj);
mbed_official 133:d4dda5c437f0 98
mbed_official 133:d4dda5c437f0 99 // I2C configuration
mbed_official 133:d4dda5c437f0 100 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 133:d4dda5c437f0 101 }
mbed_official 133:d4dda5c437f0 102
mbed_official 133:d4dda5c437f0 103 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 133:d4dda5c437f0 104 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 105
mbed_official 133:d4dda5c437f0 106 if ((hz != 0) && (hz <= 400000)) {
mbed_official 133:d4dda5c437f0 107 // I2C configuration
mbed_official 133:d4dda5c437f0 108 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 133:d4dda5c437f0 109 I2cHandle.Init.ClockSpeed = hz;
mbed_official 133:d4dda5c437f0 110 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 133:d4dda5c437f0 111 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
mbed_official 133:d4dda5c437f0 112 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 133:d4dda5c437f0 113 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 133:d4dda5c437f0 114 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 133:d4dda5c437f0 115 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 133:d4dda5c437f0 116 HAL_I2C_Init(&I2cHandle);
mbed_official 133:d4dda5c437f0 117 }
mbed_official 133:d4dda5c437f0 118 else {
mbed_official 133:d4dda5c437f0 119 error("I2C error: frequency setting failed (max 400kHz).");
mbed_official 133:d4dda5c437f0 120 }
mbed_official 133:d4dda5c437f0 121 }
mbed_official 133:d4dda5c437f0 122
mbed_official 133:d4dda5c437f0 123 inline int i2c_start(i2c_t *obj) {
mbed_official 133:d4dda5c437f0 124 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 125 int timeout;
mbed_official 133:d4dda5c437f0 126
mbed_official 133:d4dda5c437f0 127 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 128
mbed_official 133:d4dda5c437f0 129 // Clear Acknowledge failure flag
mbed_official 133:d4dda5c437f0 130 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 133:d4dda5c437f0 131
mbed_official 133:d4dda5c437f0 132 // Generate the START condition
mbed_official 133:d4dda5c437f0 133 i2c->CR1 |= I2C_CR1_START;
mbed_official 133:d4dda5c437f0 134
mbed_official 133:d4dda5c437f0 135 // Wait the START condition has been correctly sent
mbed_official 133:d4dda5c437f0 136 timeout = FLAG_TIMEOUT;
mbed_official 133:d4dda5c437f0 137 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 133:d4dda5c437f0 138 if ((timeout--) == 0) {
mbed_official 133:d4dda5c437f0 139 return 1;
mbed_official 133:d4dda5c437f0 140 }
mbed_official 133:d4dda5c437f0 141 }
mbed_official 133:d4dda5c437f0 142
mbed_official 133:d4dda5c437f0 143 return 0;
mbed_official 133:d4dda5c437f0 144 }
mbed_official 133:d4dda5c437f0 145
mbed_official 133:d4dda5c437f0 146 inline int i2c_stop(i2c_t *obj) {
mbed_official 133:d4dda5c437f0 147 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 148
mbed_official 133:d4dda5c437f0 149 // Generate the STOP condition
mbed_official 133:d4dda5c437f0 150 i2c->CR1 |= I2C_CR1_STOP;
mbed_official 133:d4dda5c437f0 151
mbed_official 133:d4dda5c437f0 152 return 0;
mbed_official 133:d4dda5c437f0 153 }
mbed_official 133:d4dda5c437f0 154
mbed_official 133:d4dda5c437f0 155 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 133:d4dda5c437f0 156 if (length == 0) return 0;
mbed_official 133:d4dda5c437f0 157
mbed_official 133:d4dda5c437f0 158 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 159
mbed_official 133:d4dda5c437f0 160 // Reception process with 5 seconds timeout
mbed_official 133:d4dda5c437f0 161 if (HAL_I2C_Master_Receive(&I2cHandle, (uint16_t)address, (uint8_t *)data, length, 5000) != HAL_OK) {
mbed_official 133:d4dda5c437f0 162 return 0; // Error
mbed_official 133:d4dda5c437f0 163 }
mbed_official 133:d4dda5c437f0 164
mbed_official 133:d4dda5c437f0 165 return length;
mbed_official 133:d4dda5c437f0 166 }
mbed_official 133:d4dda5c437f0 167
mbed_official 133:d4dda5c437f0 168 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 133:d4dda5c437f0 169 if (length == 0) return 0;
mbed_official 133:d4dda5c437f0 170
mbed_official 133:d4dda5c437f0 171 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 172
mbed_official 133:d4dda5c437f0 173 // Transmission process with 5 seconds timeout
mbed_official 133:d4dda5c437f0 174 if (HAL_I2C_Master_Transmit(&I2cHandle, (uint16_t)address, (uint8_t *)data, length, 5000) != HAL_OK) {
mbed_official 133:d4dda5c437f0 175 return 0; // Error
mbed_official 133:d4dda5c437f0 176 }
mbed_official 133:d4dda5c437f0 177
mbed_official 133:d4dda5c437f0 178 return length;
mbed_official 133:d4dda5c437f0 179 }
mbed_official 133:d4dda5c437f0 180
mbed_official 133:d4dda5c437f0 181 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 133:d4dda5c437f0 182 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 183 int timeout;
mbed_official 133:d4dda5c437f0 184
mbed_official 133:d4dda5c437f0 185 if (last) {
mbed_official 133:d4dda5c437f0 186 // Don't acknowledge the last byte
mbed_official 133:d4dda5c437f0 187 i2c->CR1 &= ~I2C_CR1_ACK;
mbed_official 133:d4dda5c437f0 188 } else {
mbed_official 133:d4dda5c437f0 189 // Acknowledge the byte
mbed_official 133:d4dda5c437f0 190 i2c->CR1 |= I2C_CR1_ACK;
mbed_official 133:d4dda5c437f0 191 }
mbed_official 133:d4dda5c437f0 192
mbed_official 133:d4dda5c437f0 193 // Wait until the byte is received
mbed_official 133:d4dda5c437f0 194 timeout = FLAG_TIMEOUT;
mbed_official 133:d4dda5c437f0 195 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 133:d4dda5c437f0 196 if ((timeout--) == 0) {
mbed_official 133:d4dda5c437f0 197 return 0;
mbed_official 133:d4dda5c437f0 198 }
mbed_official 133:d4dda5c437f0 199 }
mbed_official 133:d4dda5c437f0 200
mbed_official 133:d4dda5c437f0 201 return (int)i2c->DR;
mbed_official 133:d4dda5c437f0 202 }
mbed_official 133:d4dda5c437f0 203
mbed_official 133:d4dda5c437f0 204 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 133:d4dda5c437f0 205 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 206 int timeout;
mbed_official 133:d4dda5c437f0 207
mbed_official 133:d4dda5c437f0 208 i2c->DR = (uint8_t)data;
mbed_official 133:d4dda5c437f0 209
mbed_official 133:d4dda5c437f0 210 // Wait until the byte is transmitted
mbed_official 133:d4dda5c437f0 211 timeout = FLAG_TIMEOUT;
mbed_official 133:d4dda5c437f0 212 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
mbed_official 133:d4dda5c437f0 213 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
mbed_official 133:d4dda5c437f0 214 if ((timeout--) == 0) {
mbed_official 133:d4dda5c437f0 215 return 0;
mbed_official 133:d4dda5c437f0 216 }
mbed_official 133:d4dda5c437f0 217 }
mbed_official 133:d4dda5c437f0 218
mbed_official 133:d4dda5c437f0 219 return 1;
mbed_official 133:d4dda5c437f0 220 }
mbed_official 133:d4dda5c437f0 221
mbed_official 133:d4dda5c437f0 222 void i2c_reset(i2c_t *obj) {
mbed_official 133:d4dda5c437f0 223 if (obj->i2c == I2C_1) {
mbed_official 133:d4dda5c437f0 224 __I2C1_FORCE_RESET();
mbed_official 133:d4dda5c437f0 225 __I2C1_RELEASE_RESET();
mbed_official 133:d4dda5c437f0 226 }
mbed_official 133:d4dda5c437f0 227 if (obj->i2c == I2C_2) {
mbed_official 133:d4dda5c437f0 228 __I2C2_FORCE_RESET();
mbed_official 133:d4dda5c437f0 229 __I2C2_RELEASE_RESET();
mbed_official 133:d4dda5c437f0 230 }
mbed_official 133:d4dda5c437f0 231 if (obj->i2c == I2C_3) {
mbed_official 133:d4dda5c437f0 232 __I2C3_FORCE_RESET();
mbed_official 133:d4dda5c437f0 233 __I2C3_RELEASE_RESET();
mbed_official 133:d4dda5c437f0 234 }
mbed_official 133:d4dda5c437f0 235 }
mbed_official 133:d4dda5c437f0 236
mbed_official 133:d4dda5c437f0 237 #if DEVICE_I2CSLAVE
mbed_official 133:d4dda5c437f0 238
mbed_official 133:d4dda5c437f0 239 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 133:d4dda5c437f0 240 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 241 uint16_t tmpreg;
mbed_official 133:d4dda5c437f0 242
mbed_official 133:d4dda5c437f0 243 // Get the old register value
mbed_official 133:d4dda5c437f0 244 tmpreg = i2c->OAR1;
mbed_official 133:d4dda5c437f0 245 // Reset address bits
mbed_official 133:d4dda5c437f0 246 tmpreg &= 0xFC00;
mbed_official 133:d4dda5c437f0 247 // Set new address
mbed_official 133:d4dda5c437f0 248 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 133:d4dda5c437f0 249 // Store the new register value
mbed_official 133:d4dda5c437f0 250 i2c->OAR1 = tmpreg;
mbed_official 133:d4dda5c437f0 251 }
mbed_official 133:d4dda5c437f0 252
mbed_official 133:d4dda5c437f0 253 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 133:d4dda5c437f0 254 // Nothing to do
mbed_official 133:d4dda5c437f0 255 }
mbed_official 133:d4dda5c437f0 256
mbed_official 133:d4dda5c437f0 257 // See I2CSlave.h
mbed_official 133:d4dda5c437f0 258 #define NoData 0 // the slave has not been addressed
mbed_official 133:d4dda5c437f0 259 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 133:d4dda5c437f0 260 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 133:d4dda5c437f0 261 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 133:d4dda5c437f0 262
mbed_official 133:d4dda5c437f0 263 int i2c_slave_receive(i2c_t *obj) {
mbed_official 133:d4dda5c437f0 264 // TO BE DONE
mbed_official 133:d4dda5c437f0 265 return(0);
mbed_official 133:d4dda5c437f0 266 }
mbed_official 133:d4dda5c437f0 267
mbed_official 133:d4dda5c437f0 268 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 133:d4dda5c437f0 269 if (length == 0) return 0;
mbed_official 133:d4dda5c437f0 270
mbed_official 133:d4dda5c437f0 271 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 272
mbed_official 133:d4dda5c437f0 273 // Reception process with 5 seconds timeout
mbed_official 133:d4dda5c437f0 274 if (HAL_I2C_Slave_Receive(&I2cHandle, (uint8_t *)data, length, 5000) != HAL_OK) {
mbed_official 133:d4dda5c437f0 275 return 0; // Error
mbed_official 133:d4dda5c437f0 276 }
mbed_official 133:d4dda5c437f0 277
mbed_official 133:d4dda5c437f0 278 return length;
mbed_official 133:d4dda5c437f0 279 }
mbed_official 133:d4dda5c437f0 280
mbed_official 133:d4dda5c437f0 281 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 133:d4dda5c437f0 282 if (length == 0) return 0;
mbed_official 133:d4dda5c437f0 283
mbed_official 133:d4dda5c437f0 284 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 285
mbed_official 133:d4dda5c437f0 286 // Transmission process with 5 seconds timeout
mbed_official 133:d4dda5c437f0 287 if (HAL_I2C_Slave_Transmit(&I2cHandle, (uint8_t *)data, length, 5000) != HAL_OK) {
mbed_official 133:d4dda5c437f0 288 return 0; // Error
mbed_official 133:d4dda5c437f0 289 }
mbed_official 133:d4dda5c437f0 290
mbed_official 133:d4dda5c437f0 291 return length;
mbed_official 133:d4dda5c437f0 292 }
mbed_official 133:d4dda5c437f0 293
mbed_official 133:d4dda5c437f0 294
mbed_official 133:d4dda5c437f0 295 #endif // DEVICE_I2CSLAVE
mbed_official 133:d4dda5c437f0 296
mbed_official 133:d4dda5c437f0 297 #endif // DEVICE_I2C