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targets/hal/TARGET_STM/TARGET_NUCLEO_L053R8/i2c_api.c@181:a4cbdfbbd2f4, 2014-05-07 (annotated)

Committer:
mbed_official
Date:
Wed May 07 13:15:08 2014 +0100
Revision:
181:a4cbdfbbd2f4
Child:
202:bd6461c07541
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 181:a4cbdfbbd2f4 1 /* mbed Microcontroller Library
mbed_official 181:a4cbdfbbd2f4 2 *******************************************************************************
mbed_official 181:a4cbdfbbd2f4 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 181:a4cbdfbbd2f4 4 * All rights reserved.
mbed_official 181:a4cbdfbbd2f4 5 *
mbed_official 181:a4cbdfbbd2f4 6 * Redistribution and use in source and binary forms, with or without
mbed_official 181:a4cbdfbbd2f4 7 * modification, are permitted provided that the following conditions are met:
mbed_official 181:a4cbdfbbd2f4 8 *
mbed_official 181:a4cbdfbbd2f4 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 181:a4cbdfbbd2f4 10 * this list of conditions and the following disclaimer.
mbed_official 181:a4cbdfbbd2f4 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 181:a4cbdfbbd2f4 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 181:a4cbdfbbd2f4 13 * and/or other materials provided with the distribution.
mbed_official 181:a4cbdfbbd2f4 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 181:a4cbdfbbd2f4 15 * may be used to endorse or promote products derived from this software
mbed_official 181:a4cbdfbbd2f4 16 * without specific prior written permission.
mbed_official 181:a4cbdfbbd2f4 17 *
mbed_official 181:a4cbdfbbd2f4 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 181:a4cbdfbbd2f4 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 181:a4cbdfbbd2f4 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 181:a4cbdfbbd2f4 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 181:a4cbdfbbd2f4 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 181:a4cbdfbbd2f4 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 181:a4cbdfbbd2f4 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 181:a4cbdfbbd2f4 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 181:a4cbdfbbd2f4 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 181:a4cbdfbbd2f4 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 181:a4cbdfbbd2f4 28 *******************************************************************************
mbed_official 181:a4cbdfbbd2f4 29 */
mbed_official 181:a4cbdfbbd2f4 30 #include "i2c_api.h"
mbed_official 181:a4cbdfbbd2f4 31
mbed_official 181:a4cbdfbbd2f4 32 #if DEVICE_I2C
mbed_official 181:a4cbdfbbd2f4 33
mbed_official 181:a4cbdfbbd2f4 34 #include "cmsis.h"
mbed_official 181:a4cbdfbbd2f4 35 #include "pinmap.h"
mbed_official 181:a4cbdfbbd2f4 36 #include "error.h"
mbed_official 181:a4cbdfbbd2f4 37
mbed_official 181:a4cbdfbbd2f4 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 181:a4cbdfbbd2f4 39 not based on accurate values, they just guarantee that the application will
mbed_official 181:a4cbdfbbd2f4 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 181:a4cbdfbbd2f4 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 181:a4cbdfbbd2f4 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 181:a4cbdfbbd2f4 43
mbed_official 181:a4cbdfbbd2f4 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 181:a4cbdfbbd2f4 45 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 181:a4cbdfbbd2f4 46 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 181:a4cbdfbbd2f4 47 {PB_11, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF6_I2C2)},
mbed_official 181:a4cbdfbbd2f4 48 {PB_14, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 181:a4cbdfbbd2f4 49 {NC, NC, 0}
mbed_official 181:a4cbdfbbd2f4 50 };
mbed_official 181:a4cbdfbbd2f4 51
mbed_official 181:a4cbdfbbd2f4 52 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 181:a4cbdfbbd2f4 53 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 181:a4cbdfbbd2f4 54 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 181:a4cbdfbbd2f4 55 {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF6_I2C2)},
mbed_official 181:a4cbdfbbd2f4 56 {PB_13, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 181:a4cbdfbbd2f4 57 {NC, NC, 0}
mbed_official 181:a4cbdfbbd2f4 58 };
mbed_official 181:a4cbdfbbd2f4 59
mbed_official 181:a4cbdfbbd2f4 60 I2C_HandleTypeDef I2cHandle;
mbed_official 181:a4cbdfbbd2f4 61
mbed_official 181:a4cbdfbbd2f4 62 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 181:a4cbdfbbd2f4 63 // Determine the I2C to use
mbed_official 181:a4cbdfbbd2f4 64 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 181:a4cbdfbbd2f4 65 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 181:a4cbdfbbd2f4 66
mbed_official 181:a4cbdfbbd2f4 67 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 181:a4cbdfbbd2f4 68
mbed_official 181:a4cbdfbbd2f4 69 if (obj->i2c == (I2CName)NC) {
mbed_official 181:a4cbdfbbd2f4 70 error("I2C error: pinout mapping failed.");
mbed_official 181:a4cbdfbbd2f4 71 }
mbed_official 181:a4cbdfbbd2f4 72
mbed_official 181:a4cbdfbbd2f4 73 // Enable I2C clock
mbed_official 181:a4cbdfbbd2f4 74 if (obj->i2c == I2C_1) {
mbed_official 181:a4cbdfbbd2f4 75 __I2C1_CLK_ENABLE();
mbed_official 181:a4cbdfbbd2f4 76 }
mbed_official 181:a4cbdfbbd2f4 77 if (obj->i2c == I2C_2) {
mbed_official 181:a4cbdfbbd2f4 78 __I2C2_CLK_ENABLE();
mbed_official 181:a4cbdfbbd2f4 79 }
mbed_official 181:a4cbdfbbd2f4 80
mbed_official 181:a4cbdfbbd2f4 81 // Configure I2C pins
mbed_official 181:a4cbdfbbd2f4 82 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 181:a4cbdfbbd2f4 83 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 181:a4cbdfbbd2f4 84 pin_mode(sda, OpenDrain);
mbed_official 181:a4cbdfbbd2f4 85 pin_mode(scl, OpenDrain);
mbed_official 181:a4cbdfbbd2f4 86
mbed_official 181:a4cbdfbbd2f4 87 // Reset to clear pending flags if any
mbed_official 181:a4cbdfbbd2f4 88 i2c_reset(obj);
mbed_official 181:a4cbdfbbd2f4 89
mbed_official 181:a4cbdfbbd2f4 90 // I2C configuration
mbed_official 181:a4cbdfbbd2f4 91 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 181:a4cbdfbbd2f4 92 }
mbed_official 181:a4cbdfbbd2f4 93
mbed_official 181:a4cbdfbbd2f4 94 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 181:a4cbdfbbd2f4 95 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 96
mbed_official 181:a4cbdfbbd2f4 97 // Common settings: I2C clock = 32 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 181:a4cbdfbbd2f4 98 switch (hz) {
mbed_official 181:a4cbdfbbd2f4 99 case 100000:
mbed_official 181:a4cbdfbbd2f4 100 I2cHandle.Init.Timing = 0x20602938; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 101 break;
mbed_official 181:a4cbdfbbd2f4 102 case 400000:
mbed_official 181:a4cbdfbbd2f4 103 I2cHandle.Init.Timing = 0x00B0122A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 104 break;
mbed_official 181:a4cbdfbbd2f4 105 case 1000000:
mbed_official 181:a4cbdfbbd2f4 106 I2cHandle.Init.Timing = 0x0030040E; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 107 break;
mbed_official 181:a4cbdfbbd2f4 108 default:
mbed_official 181:a4cbdfbbd2f4 109 error("Only 100kHz, 400kHz and 1MHz I2C frequencies are supported.");
mbed_official 181:a4cbdfbbd2f4 110 break;
mbed_official 181:a4cbdfbbd2f4 111 }
mbed_official 181:a4cbdfbbd2f4 112
mbed_official 181:a4cbdfbbd2f4 113 // I2C configuration
mbed_official 181:a4cbdfbbd2f4 114 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 181:a4cbdfbbd2f4 115 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 181:a4cbdfbbd2f4 116 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 181:a4cbdfbbd2f4 117 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 181:a4cbdfbbd2f4 118 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 181:a4cbdfbbd2f4 119 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 181:a4cbdfbbd2f4 120 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 181:a4cbdfbbd2f4 121 HAL_I2C_Init(&I2cHandle);
mbed_official 181:a4cbdfbbd2f4 122 }
mbed_official 181:a4cbdfbbd2f4 123
mbed_official 181:a4cbdfbbd2f4 124 inline int i2c_start(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 125 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 126 int timeout;
mbed_official 181:a4cbdfbbd2f4 127
mbed_official 181:a4cbdfbbd2f4 128 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 129
mbed_official 181:a4cbdfbbd2f4 130 // Clear Acknowledge failure flag
mbed_official 181:a4cbdfbbd2f4 131 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 181:a4cbdfbbd2f4 132
mbed_official 181:a4cbdfbbd2f4 133 // Generate the START condition
mbed_official 181:a4cbdfbbd2f4 134 i2c->CR2 |= I2C_CR2_START;
mbed_official 181:a4cbdfbbd2f4 135
mbed_official 181:a4cbdfbbd2f4 136 // Wait the START condition has been correctly sent
mbed_official 181:a4cbdfbbd2f4 137 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 138 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 181:a4cbdfbbd2f4 139 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 140 return 1;
mbed_official 181:a4cbdfbbd2f4 141 }
mbed_official 181:a4cbdfbbd2f4 142 }
mbed_official 181:a4cbdfbbd2f4 143
mbed_official 181:a4cbdfbbd2f4 144 return 0;
mbed_official 181:a4cbdfbbd2f4 145 }
mbed_official 181:a4cbdfbbd2f4 146
mbed_official 181:a4cbdfbbd2f4 147 inline int i2c_stop(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 148 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 149
mbed_official 181:a4cbdfbbd2f4 150 // Generate the STOP condition
mbed_official 181:a4cbdfbbd2f4 151 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 181:a4cbdfbbd2f4 152
mbed_official 181:a4cbdfbbd2f4 153 return 0;
mbed_official 181:a4cbdfbbd2f4 154 }
mbed_official 181:a4cbdfbbd2f4 155
mbed_official 181:a4cbdfbbd2f4 156 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 181:a4cbdfbbd2f4 157 if (length == 0) return 0;
mbed_official 181:a4cbdfbbd2f4 158
mbed_official 181:a4cbdfbbd2f4 159 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 160
mbed_official 181:a4cbdfbbd2f4 161 // Reception process with 5 seconds timeout
mbed_official 181:a4cbdfbbd2f4 162 if (HAL_I2C_Master_Receive(&I2cHandle, (uint16_t)address, (uint8_t *)data, length, 5000) != HAL_OK) {
mbed_official 181:a4cbdfbbd2f4 163 return 0; // Error
mbed_official 181:a4cbdfbbd2f4 164 }
mbed_official 181:a4cbdfbbd2f4 165
mbed_official 181:a4cbdfbbd2f4 166 return length;
mbed_official 181:a4cbdfbbd2f4 167 }
mbed_official 181:a4cbdfbbd2f4 168
mbed_official 181:a4cbdfbbd2f4 169 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 181:a4cbdfbbd2f4 170 if (length == 0) return 0;
mbed_official 181:a4cbdfbbd2f4 171
mbed_official 181:a4cbdfbbd2f4 172 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 173
mbed_official 181:a4cbdfbbd2f4 174 // Transmission process with 5 seconds timeout
mbed_official 181:a4cbdfbbd2f4 175 if (HAL_I2C_Master_Transmit(&I2cHandle, (uint16_t)address, (uint8_t *)data, length, 5000) != HAL_OK) {
mbed_official 181:a4cbdfbbd2f4 176 return 0; // Error
mbed_official 181:a4cbdfbbd2f4 177 }
mbed_official 181:a4cbdfbbd2f4 178
mbed_official 181:a4cbdfbbd2f4 179 return length;
mbed_official 181:a4cbdfbbd2f4 180 }
mbed_official 181:a4cbdfbbd2f4 181
mbed_official 181:a4cbdfbbd2f4 182 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 181:a4cbdfbbd2f4 183 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 184 int timeout;
mbed_official 181:a4cbdfbbd2f4 185
mbed_official 181:a4cbdfbbd2f4 186 if (last) {
mbed_official 181:a4cbdfbbd2f4 187 // Don't acknowledge the last byte
mbed_official 181:a4cbdfbbd2f4 188 i2c->CR2 &= ~I2C_CR2_NACK;
mbed_official 181:a4cbdfbbd2f4 189 } else {
mbed_official 181:a4cbdfbbd2f4 190 // Acknowledge the byte
mbed_official 181:a4cbdfbbd2f4 191 i2c->CR2 |= I2C_CR2_NACK;
mbed_official 181:a4cbdfbbd2f4 192 }
mbed_official 181:a4cbdfbbd2f4 193
mbed_official 181:a4cbdfbbd2f4 194 // Wait until the byte is received
mbed_official 181:a4cbdfbbd2f4 195 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 196 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 197 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 198 return 0;
mbed_official 181:a4cbdfbbd2f4 199 }
mbed_official 181:a4cbdfbbd2f4 200 }
mbed_official 181:a4cbdfbbd2f4 201
mbed_official 181:a4cbdfbbd2f4 202 return (int)i2c->RXDR;
mbed_official 181:a4cbdfbbd2f4 203 }
mbed_official 181:a4cbdfbbd2f4 204
mbed_official 181:a4cbdfbbd2f4 205 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 181:a4cbdfbbd2f4 206 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 207 int timeout;
mbed_official 181:a4cbdfbbd2f4 208
mbed_official 181:a4cbdfbbd2f4 209 i2c->TXDR = (uint8_t)data;
mbed_official 181:a4cbdfbbd2f4 210
mbed_official 181:a4cbdfbbd2f4 211 // Wait until the byte is transmitted
mbed_official 181:a4cbdfbbd2f4 212 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 213 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 214 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 215 return 0;
mbed_official 181:a4cbdfbbd2f4 216 }
mbed_official 181:a4cbdfbbd2f4 217 }
mbed_official 181:a4cbdfbbd2f4 218
mbed_official 181:a4cbdfbbd2f4 219 return 1;
mbed_official 181:a4cbdfbbd2f4 220 }
mbed_official 181:a4cbdfbbd2f4 221
mbed_official 181:a4cbdfbbd2f4 222 void i2c_reset(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 223 if (obj->i2c == I2C_1) {
mbed_official 181:a4cbdfbbd2f4 224 __I2C1_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 225 __I2C1_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 226 }
mbed_official 181:a4cbdfbbd2f4 227 if (obj->i2c == I2C_2) {
mbed_official 181:a4cbdfbbd2f4 228 __I2C2_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 229 __I2C2_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 230 }
mbed_official 181:a4cbdfbbd2f4 231 }
mbed_official 181:a4cbdfbbd2f4 232
mbed_official 181:a4cbdfbbd2f4 233 #if DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 234
mbed_official 181:a4cbdfbbd2f4 235 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 181:a4cbdfbbd2f4 236 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 237 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 238
mbed_official 181:a4cbdfbbd2f4 239 // disable
mbed_official 181:a4cbdfbbd2f4 240 i2c->OAR1 &= (uin32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 241 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 242 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 243 // Reset address bits
mbed_official 181:a4cbdfbbd2f4 244 tmpreg &= 0xFC00;
mbed_official 181:a4cbdfbbd2f4 245 // Set new address
mbed_official 181:a4cbdfbbd2f4 246 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 181:a4cbdfbbd2f4 247 // Store the new register value
mbed_official 181:a4cbdfbbd2f4 248 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 249 // enable
mbed_official 181:a4cbdfbbd2f4 250 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 251 }
mbed_official 181:a4cbdfbbd2f4 252
mbed_official 181:a4cbdfbbd2f4 253 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 181:a4cbdfbbd2f4 254
mbed_official 181:a4cbdfbbd2f4 255 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 256 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 257
mbed_official 181:a4cbdfbbd2f4 258 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 259 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 260
mbed_official 181:a4cbdfbbd2f4 261 // Enable / disable slave
mbed_official 181:a4cbdfbbd2f4 262 if (enable_slave == 1) {
mbed_official 181:a4cbdfbbd2f4 263 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 264 } else {
mbed_official 181:a4cbdfbbd2f4 265 tmpreg &= (uin32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 266 }
mbed_official 181:a4cbdfbbd2f4 267
mbed_official 181:a4cbdfbbd2f4 268 // Set new mode
mbed_official 181:a4cbdfbbd2f4 269 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 270
mbed_official 181:a4cbdfbbd2f4 271 }
mbed_official 181:a4cbdfbbd2f4 272
mbed_official 181:a4cbdfbbd2f4 273 // See I2CSlave.h
mbed_official 181:a4cbdfbbd2f4 274 #define NoData 0 // the slave has not been addressed
mbed_official 181:a4cbdfbbd2f4 275 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 181:a4cbdfbbd2f4 276 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 181:a4cbdfbbd2f4 277 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 181:a4cbdfbbd2f4 278
mbed_official 181:a4cbdfbbd2f4 279 int i2c_slave_receive(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 280 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 281 char address;
mbed_official 181:a4cbdfbbd2f4 282 int retValue = NoData;
mbed_official 181:a4cbdfbbd2f4 283
mbed_official 181:a4cbdfbbd2f4 284 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 181:a4cbdfbbd2f4 285 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 181:a4cbdfbbd2f4 286 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 181:a4cbdfbbd2f4 287 retValue = ReadAddressed;
mbed_official 181:a4cbdfbbd2f4 288 else
mbed_official 181:a4cbdfbbd2f4 289 retValue = WriteAddressed;
mbed_official 181:a4cbdfbbd2f4 290 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 181:a4cbdfbbd2f4 291 }
mbed_official 181:a4cbdfbbd2f4 292 }
mbed_official 181:a4cbdfbbd2f4 293
mbed_official 181:a4cbdfbbd2f4 294 return (retValue);
mbed_official 181:a4cbdfbbd2f4 295 }
mbed_official 181:a4cbdfbbd2f4 296
mbed_official 181:a4cbdfbbd2f4 297 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 181:a4cbdfbbd2f4 298 if (length == 0) return 0;
mbed_official 181:a4cbdfbbd2f4 299
mbed_official 181:a4cbdfbbd2f4 300 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 301
mbed_official 181:a4cbdfbbd2f4 302 // Reception process with 5 seconds timeout
mbed_official 181:a4cbdfbbd2f4 303 if (HAL_I2C_Slave_Receive(&I2cHandle, (uint8_t *)data, length, 5000) != HAL_OK) {
mbed_official 181:a4cbdfbbd2f4 304 return 0; // Error
mbed_official 181:a4cbdfbbd2f4 305 }
mbed_official 181:a4cbdfbbd2f4 306
mbed_official 181:a4cbdfbbd2f4 307 return length;
mbed_official 181:a4cbdfbbd2f4 308 }
mbed_official 181:a4cbdfbbd2f4 309
mbed_official 181:a4cbdfbbd2f4 310 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 181:a4cbdfbbd2f4 311 char size = 0;
mbed_official 181:a4cbdfbbd2f4 312
mbed_official 181:a4cbdfbbd2f4 313 if (length == 0) return 0;
mbed_official 181:a4cbdfbbd2f4 314
mbed_official 181:a4cbdfbbd2f4 315 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 316
mbed_official 181:a4cbdfbbd2f4 317 do {
mbed_official 181:a4cbdfbbd2f4 318 i2c_byte_write(obj, data[size]);
mbed_official 181:a4cbdfbbd2f4 319 size++;
mbed_official 181:a4cbdfbbd2f4 320 } while (size < length);
mbed_official 181:a4cbdfbbd2f4 321
mbed_official 181:a4cbdfbbd2f4 322 return size;
mbed_official 181:a4cbdfbbd2f4 323 }
mbed_official 181:a4cbdfbbd2f4 324
mbed_official 181:a4cbdfbbd2f4 325
mbed_official 181:a4cbdfbbd2f4 326 #endif // DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 327
mbed_official 181:a4cbdfbbd2f4 328 #endif // DEVICE_I2C