Sigve Sebastian Farstad / mbed-src

mbed w/ spi bug fig

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Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_L053R8/i2c_api.c@202:bd6461c07541, 2014-05-21 (annotated)

Committer:
mbed_official
Date:
Wed May 21 15:00:07 2014 +0100
Revision:
202:bd6461c07541
Parent:
181:a4cbdfbbd2f4
Child:
210:45934c3d812a
Synchronized with git revision b94c8a221b8b7db227cfd749fb637c0ee27e986b



Full URL: https://github.com/mbedmicro/mbed/commit/b94c8a221b8b7db227cfd749fb637c0ee27e986b/



[NUCLEO_L053R8] enhance I2C master (stop) and add I2C slave

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 202:bd6461c07541 157 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 158 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 159 int timeout;
mbed_official 202:bd6461c07541 160 int count;
mbed_official 202:bd6461c07541 161 int value;
mbed_official 202:bd6461c07541 162
mbed_official 181:a4cbdfbbd2f4 163 if (length == 0) return 0;
mbed_official 181:a4cbdfbbd2f4 164
mbed_official 202:bd6461c07541 165 /* update CR2 register */
mbed_official 202:bd6461c07541 166 i2c->CR2 = (i2c->CR2 & (uint32_t)~((uint32_t)(I2C_CR2_SADD | I2C_CR2_NBYTES | I2C_CR2_RELOAD | I2C_CR2_AUTOEND | I2C_CR2_RD_WRN | I2C_CR2_START | I2C_CR2_STOP)))
mbed_official 202:bd6461c07541 167 | (uint32_t)(((uint32_t)address & I2C_CR2_SADD) | (((uint32_t)length << 16 ) & I2C_CR2_NBYTES) | (uint32_t)I2C_SOFTEND_MODE | (uint32_t)I2C_GENERATE_START_READ);
mbed_official 202:bd6461c07541 168
mbed_official 202:bd6461c07541 169 // Read all bytes
mbed_official 202:bd6461c07541 170 for (count = 0; count < length; count++) {
mbed_official 202:bd6461c07541 171 value = i2c_byte_read(obj, 0);
mbed_official 202:bd6461c07541 172 data[count] = (char)value;
mbed_official 202:bd6461c07541 173 }
mbed_official 181:a4cbdfbbd2f4 174
mbed_official 202:bd6461c07541 175 // Wait transfer complete
mbed_official 202:bd6461c07541 176 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 177 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 202:bd6461c07541 178 timeout--;
mbed_official 202:bd6461c07541 179 if (timeout == 0) {
mbed_official 202:bd6461c07541 180 return 0;
mbed_official 202:bd6461c07541 181 }
mbed_official 202:bd6461c07541 182 }
mbed_official 202:bd6461c07541 183 __HAL_I2C_CLEAR_FLAG(&I2cHandle,I2C_FLAG_TC);
mbed_official 202:bd6461c07541 184
mbed_official 202:bd6461c07541 185 // If not repeated start, send stop.
mbed_official 202:bd6461c07541 186 if (stop) {
mbed_official 202:bd6461c07541 187 i2c_stop(obj);
mbed_official 202:bd6461c07541 188 /* Wait until STOPF flag is set */
mbed_official 202:bd6461c07541 189 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 190 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 202:bd6461c07541 191 timeout--;
mbed_official 202:bd6461c07541 192 if (timeout == 0) {
mbed_official 202:bd6461c07541 193 return 0;
mbed_official 202:bd6461c07541 194 }
mbed_official 202:bd6461c07541 195 }
mbed_official 202:bd6461c07541 196 /* Clear STOP Flag */
mbed_official 202:bd6461c07541 197 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 181:a4cbdfbbd2f4 198 }
mbed_official 181:a4cbdfbbd2f4 199
mbed_official 181:a4cbdfbbd2f4 200 return length;
mbed_official 181:a4cbdfbbd2f4 201 }
mbed_official 181:a4cbdfbbd2f4 202
mbed_official 181:a4cbdfbbd2f4 203 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 202:bd6461c07541 204 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 205 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 206 int timeout;
mbed_official 202:bd6461c07541 207 int count;
mbed_official 202:bd6461c07541 208
mbed_official 181:a4cbdfbbd2f4 209 if (length == 0) return 0;
mbed_official 181:a4cbdfbbd2f4 210
mbed_official 202:bd6461c07541 211 /* update CR2 register */
mbed_official 202:bd6461c07541 212 i2c->CR2 = (i2c->CR2 & (uint32_t)~((uint32_t)(I2C_CR2_SADD | I2C_CR2_NBYTES | I2C_CR2_RELOAD | I2C_CR2_AUTOEND | I2C_CR2_RD_WRN | I2C_CR2_START | I2C_CR2_STOP)))
mbed_official 202:bd6461c07541 213 | (uint32_t)(((uint32_t)address & I2C_CR2_SADD) | (((uint32_t)length << 16 ) & I2C_CR2_NBYTES) | (uint32_t)I2C_SOFTEND_MODE | (uint32_t)I2C_GENERATE_START_WRITE);
mbed_official 202:bd6461c07541 214
mbed_official 181:a4cbdfbbd2f4 215
mbed_official 202:bd6461c07541 216
mbed_official 202:bd6461c07541 217 for (count = 0; count < length; count++) {
mbed_official 202:bd6461c07541 218 i2c_byte_write(obj, data[count]);
mbed_official 181:a4cbdfbbd2f4 219 }
mbed_official 181:a4cbdfbbd2f4 220
mbed_official 202:bd6461c07541 221 // Wait transfer complete
mbed_official 202:bd6461c07541 222 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 223 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 202:bd6461c07541 224 timeout--;
mbed_official 202:bd6461c07541 225 if (timeout == 0) {
mbed_official 202:bd6461c07541 226 return 0;
mbed_official 202:bd6461c07541 227 }
mbed_official 202:bd6461c07541 228 }
mbed_official 202:bd6461c07541 229 __HAL_I2C_CLEAR_FLAG(&I2cHandle,I2C_FLAG_TC);
mbed_official 202:bd6461c07541 230
mbed_official 202:bd6461c07541 231 // If not repeated start, send stop.
mbed_official 202:bd6461c07541 232 if (stop) {
mbed_official 202:bd6461c07541 233 i2c_stop(obj);
mbed_official 202:bd6461c07541 234 /* Wait until STOPF flag is set */
mbed_official 202:bd6461c07541 235 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 236 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 202:bd6461c07541 237 timeout--;
mbed_official 202:bd6461c07541 238 if (timeout == 0) {
mbed_official 202:bd6461c07541 239 return 0;
mbed_official 202:bd6461c07541 240 }
mbed_official 202:bd6461c07541 241 }
mbed_official 202:bd6461c07541 242 /* Clear STOP Flag */
mbed_official 202:bd6461c07541 243 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 202:bd6461c07541 244 }
mbed_official 202:bd6461c07541 245
mbed_official 202:bd6461c07541 246 return count;
mbed_official 181:a4cbdfbbd2f4 247 }
mbed_official 181:a4cbdfbbd2f4 248
mbed_official 181:a4cbdfbbd2f4 249 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 181:a4cbdfbbd2f4 250 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 251 int timeout;
mbed_official 181:a4cbdfbbd2f4 252
mbed_official 181:a4cbdfbbd2f4 253 // Wait until the byte is received
mbed_official 181:a4cbdfbbd2f4 254 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 255 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 256 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 257 return 0;
mbed_official 181:a4cbdfbbd2f4 258 }
mbed_official 181:a4cbdfbbd2f4 259 }
mbed_official 181:a4cbdfbbd2f4 260
mbed_official 181:a4cbdfbbd2f4 261 return (int)i2c->RXDR;
mbed_official 181:a4cbdfbbd2f4 262 }
mbed_official 181:a4cbdfbbd2f4 263
mbed_official 181:a4cbdfbbd2f4 264 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 181:a4cbdfbbd2f4 265 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 266 int timeout;
mbed_official 181:a4cbdfbbd2f4 267
mbed_official 202:bd6461c07541 268 // Wait until the previous byte is transmitted
mbed_official 181:a4cbdfbbd2f4 269 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 270 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 181:a4cbdfbbd2f4 271 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 272 return 0;
mbed_official 181:a4cbdfbbd2f4 273 }
mbed_official 181:a4cbdfbbd2f4 274 }
mbed_official 181:a4cbdfbbd2f4 275
mbed_official 202:bd6461c07541 276 i2c->TXDR = (uint8_t)data;
mbed_official 202:bd6461c07541 277
mbed_official 181:a4cbdfbbd2f4 278 return 1;
mbed_official 181:a4cbdfbbd2f4 279 }
mbed_official 181:a4cbdfbbd2f4 280
mbed_official 181:a4cbdfbbd2f4 281 void i2c_reset(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 282 if (obj->i2c == I2C_1) {
mbed_official 181:a4cbdfbbd2f4 283 __I2C1_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 284 __I2C1_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 285 }
mbed_official 181:a4cbdfbbd2f4 286 if (obj->i2c == I2C_2) {
mbed_official 181:a4cbdfbbd2f4 287 __I2C2_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 288 __I2C2_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 289 }
mbed_official 181:a4cbdfbbd2f4 290 }
mbed_official 181:a4cbdfbbd2f4 291
mbed_official 181:a4cbdfbbd2f4 292 #if DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 293
mbed_official 181:a4cbdfbbd2f4 294 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 181:a4cbdfbbd2f4 295 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 296 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 297
mbed_official 181:a4cbdfbbd2f4 298 // disable
mbed_official 202:bd6461c07541 299 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 300 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 301 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 302 // Reset address bits
mbed_official 181:a4cbdfbbd2f4 303 tmpreg &= 0xFC00;
mbed_official 181:a4cbdfbbd2f4 304 // Set new address
mbed_official 181:a4cbdfbbd2f4 305 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 181:a4cbdfbbd2f4 306 // Store the new register value
mbed_official 181:a4cbdfbbd2f4 307 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 308 // enable
mbed_official 181:a4cbdfbbd2f4 309 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 310 }
mbed_official 181:a4cbdfbbd2f4 311
mbed_official 181:a4cbdfbbd2f4 312 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 181:a4cbdfbbd2f4 313
mbed_official 181:a4cbdfbbd2f4 314 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 315 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 316
mbed_official 181:a4cbdfbbd2f4 317 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 318 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 319
mbed_official 181:a4cbdfbbd2f4 320 // Enable / disable slave
mbed_official 181:a4cbdfbbd2f4 321 if (enable_slave == 1) {
mbed_official 181:a4cbdfbbd2f4 322 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 323 } else {
mbed_official 202:bd6461c07541 324 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 325 }
mbed_official 181:a4cbdfbbd2f4 326
mbed_official 181:a4cbdfbbd2f4 327 // Set new mode
mbed_official 181:a4cbdfbbd2f4 328 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 329
mbed_official 181:a4cbdfbbd2f4 330 }
mbed_official 181:a4cbdfbbd2f4 331
mbed_official 181:a4cbdfbbd2f4 332 // See I2CSlave.h
mbed_official 181:a4cbdfbbd2f4 333 #define NoData 0 // the slave has not been addressed
mbed_official 181:a4cbdfbbd2f4 334 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 181:a4cbdfbbd2f4 335 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 181:a4cbdfbbd2f4 336 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 181:a4cbdfbbd2f4 337
mbed_official 181:a4cbdfbbd2f4 338 int i2c_slave_receive(i2c_t *obj) {
mbed_official 202:bd6461c07541 339 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 340 int retValue = NoData;
mbed_official 181:a4cbdfbbd2f4 341
mbed_official 181:a4cbdfbbd2f4 342 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 181:a4cbdfbbd2f4 343 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 181:a4cbdfbbd2f4 344 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 181:a4cbdfbbd2f4 345 retValue = ReadAddressed;
mbed_official 181:a4cbdfbbd2f4 346 else
mbed_official 181:a4cbdfbbd2f4 347 retValue = WriteAddressed;
mbed_official 181:a4cbdfbbd2f4 348 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 181:a4cbdfbbd2f4 349 }
mbed_official 181:a4cbdfbbd2f4 350 }
mbed_official 181:a4cbdfbbd2f4 351
mbed_official 181:a4cbdfbbd2f4 352 return (retValue);
mbed_official 181:a4cbdfbbd2f4 353 }
mbed_official 181:a4cbdfbbd2f4 354
mbed_official 181:a4cbdfbbd2f4 355 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 202:bd6461c07541 356 char size = 0;
mbed_official 202:bd6461c07541 357
mbed_official 181:a4cbdfbbd2f4 358 if (length == 0) return 0;
mbed_official 181:a4cbdfbbd2f4 359
mbed_official 202:bd6461c07541 360 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 181:a4cbdfbbd2f4 361
mbed_official 202:bd6461c07541 362 return size;
mbed_official 181:a4cbdfbbd2f4 363 }
mbed_official 181:a4cbdfbbd2f4 364
mbed_official 181:a4cbdfbbd2f4 365 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 181:a4cbdfbbd2f4 366 char size = 0;
mbed_official 202:bd6461c07541 367 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 368
mbed_official 181:a4cbdfbbd2f4 369 if (length == 0) return 0;
mbed_official 181:a4cbdfbbd2f4 370
mbed_official 181:a4cbdfbbd2f4 371 do {
mbed_official 181:a4cbdfbbd2f4 372 i2c_byte_write(obj, data[size]);
mbed_official 181:a4cbdfbbd2f4 373 size++;
mbed_official 181:a4cbdfbbd2f4 374 } while (size < length);
mbed_official 181:a4cbdfbbd2f4 375
mbed_official 181:a4cbdfbbd2f4 376 return size;
mbed_official 181:a4cbdfbbd2f4 377 }
mbed_official 181:a4cbdfbbd2f4 378
mbed_official 181:a4cbdfbbd2f4 379
mbed_official 181:a4cbdfbbd2f4 380 #endif // DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 381
mbed_official 181:a4cbdfbbd2f4 382 #endif // DEVICE_I2C