gabriel della-monica / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_L053C8/i2c_api.c@439:c4382fcbbaed, 2014-12-15 (annotated)

Committer:
mbed_official
Date:
Mon Dec 15 09:30:07 2014 +0000
Revision:
439:c4382fcbbaed
Parent:
376:cb4d9db17537 
Synchronized with git revision 6172cbea1a558a9a2ebbd965e77f83a9ceeec670



Full URL: https://github.com/mbedmicro/mbed/commit/6172cbea1a558a9a2ebbd965e77f83a9ceeec670/



Targets: DISCO_L053C8 - update from nucleo latest changes

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 376:cb4d9db17537 1 /* mbed Microcontroller Library
mbed_official 376:cb4d9db17537 2 *******************************************************************************
mbed_official 376:cb4d9db17537 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 376:cb4d9db17537 4 * All rights reserved.
mbed_official 376:cb4d9db17537 5 *
mbed_official 376:cb4d9db17537 6 * Redistribution and use in source and binary forms, with or without
mbed_official 376:cb4d9db17537 7 * modification, are permitted provided that the following conditions are met:
mbed_official 376:cb4d9db17537 8 *
mbed_official 376:cb4d9db17537 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 376:cb4d9db17537 10 * this list of conditions and the following disclaimer.
mbed_official 376:cb4d9db17537 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 376:cb4d9db17537 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 376:cb4d9db17537 13 * and/or other materials provided with the distribution.
mbed_official 376:cb4d9db17537 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 376:cb4d9db17537 15 * may be used to endorse or promote products derived from this software
mbed_official 376:cb4d9db17537 16 * without specific prior written permission.
mbed_official 376:cb4d9db17537 17 *
mbed_official 376:cb4d9db17537 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 376:cb4d9db17537 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 376:cb4d9db17537 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 376:cb4d9db17537 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 376:cb4d9db17537 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 376:cb4d9db17537 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 376:cb4d9db17537 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 376:cb4d9db17537 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 376:cb4d9db17537 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 376:cb4d9db17537 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 376:cb4d9db17537 28 *******************************************************************************
mbed_official 376:cb4d9db17537 29 */
mbed_official 376:cb4d9db17537 30 #include "mbed_assert.h"
mbed_official 376:cb4d9db17537 31 #include "i2c_api.h"
mbed_official 376:cb4d9db17537 32
mbed_official 376:cb4d9db17537 33 #if DEVICE_I2C
mbed_official 376:cb4d9db17537 34
mbed_official 376:cb4d9db17537 35 #include "cmsis.h"
mbed_official 376:cb4d9db17537 36 #include "pinmap.h"
mbed_official 439:c4382fcbbaed 37 #include "PeripheralPins.h"
mbed_official 376:cb4d9db17537 38
mbed_official 376:cb4d9db17537 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 376:cb4d9db17537 40 not based on accurate values, they just guarantee that the application will
mbed_official 376:cb4d9db17537 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 376:cb4d9db17537 42 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 376:cb4d9db17537 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 376:cb4d9db17537 44
mbed_official 376:cb4d9db17537 45 I2C_HandleTypeDef I2cHandle;
mbed_official 376:cb4d9db17537 46
mbed_official 376:cb4d9db17537 47 int i2c1_inited = 0;
mbed_official 376:cb4d9db17537 48 int i2c2_inited = 0;
mbed_official 376:cb4d9db17537 49
mbed_official 439:c4382fcbbaed 50 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
mbed_official 439:c4382fcbbaed 51 {
mbed_official 376:cb4d9db17537 52 // Determine the I2C to use
mbed_official 376:cb4d9db17537 53 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 376:cb4d9db17537 54 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 376:cb4d9db17537 55
mbed_official 376:cb4d9db17537 56 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 376:cb4d9db17537 57 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 376:cb4d9db17537 58
mbed_official 376:cb4d9db17537 59 // Enable I2C1 clock and pinout if not done
mbed_official 439:c4382fcbbaed 60 if ((obj->i2c == I2C_1) && !i2c1_inited) {
mbed_official 376:cb4d9db17537 61 i2c1_inited = 1;
mbed_official 376:cb4d9db17537 62 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 376:cb4d9db17537 63 __I2C1_CLK_ENABLE();
mbed_official 376:cb4d9db17537 64 // Configure I2C pins
mbed_official 376:cb4d9db17537 65 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 376:cb4d9db17537 66 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 376:cb4d9db17537 67 pin_mode(sda, OpenDrain);
mbed_official 376:cb4d9db17537 68 pin_mode(scl, OpenDrain);
mbed_official 376:cb4d9db17537 69 }
mbed_official 376:cb4d9db17537 70 // Enable I2C2 clock and pinout if not done
mbed_official 439:c4382fcbbaed 71 if ((obj->i2c == I2C_2) && !i2c2_inited) {
mbed_official 376:cb4d9db17537 72 i2c2_inited = 1;
mbed_official 376:cb4d9db17537 73 __I2C2_CLK_ENABLE();
mbed_official 376:cb4d9db17537 74 // Configure I2C pins
mbed_official 376:cb4d9db17537 75 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 376:cb4d9db17537 76 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 376:cb4d9db17537 77 pin_mode(sda, OpenDrain);
mbed_official 376:cb4d9db17537 78 pin_mode(scl, OpenDrain);
mbed_official 376:cb4d9db17537 79 }
mbed_official 376:cb4d9db17537 80
mbed_official 376:cb4d9db17537 81 // Reset to clear pending flags if any
mbed_official 376:cb4d9db17537 82 i2c_reset(obj);
mbed_official 376:cb4d9db17537 83
mbed_official 376:cb4d9db17537 84 // I2C configuration
mbed_official 376:cb4d9db17537 85 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 376:cb4d9db17537 86 }
mbed_official 376:cb4d9db17537 87
mbed_official 439:c4382fcbbaed 88 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 439:c4382fcbbaed 89 {
mbed_official 376:cb4d9db17537 90 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 376:cb4d9db17537 91 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 92 int timeout;
mbed_official 376:cb4d9db17537 93
mbed_official 376:cb4d9db17537 94 // wait before init
mbed_official 376:cb4d9db17537 95 timeout = LONG_TIMEOUT;
mbed_official 439:c4382fcbbaed 96 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 376:cb4d9db17537 97
mbed_official 376:cb4d9db17537 98 // Common settings: I2C clock = 32 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 376:cb4d9db17537 99 switch (hz) {
mbed_official 376:cb4d9db17537 100 case 100000:
mbed_official 376:cb4d9db17537 101 I2cHandle.Init.Timing = 0x20602938; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 376:cb4d9db17537 102 break;
mbed_official 376:cb4d9db17537 103 case 400000:
mbed_official 376:cb4d9db17537 104 I2cHandle.Init.Timing = 0x00B0122A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 376:cb4d9db17537 105 break;
mbed_official 376:cb4d9db17537 106 case 1000000:
mbed_official 376:cb4d9db17537 107 I2cHandle.Init.Timing = 0x0030040E; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 376:cb4d9db17537 108 break;
mbed_official 376:cb4d9db17537 109 default:
mbed_official 376:cb4d9db17537 110 break;
mbed_official 376:cb4d9db17537 111 }
mbed_official 376:cb4d9db17537 112
mbed_official 376:cb4d9db17537 113 // I2C configuration
mbed_official 376:cb4d9db17537 114 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 376:cb4d9db17537 115 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 376:cb4d9db17537 116 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 376:cb4d9db17537 117 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 376:cb4d9db17537 118 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 376:cb4d9db17537 119 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 376:cb4d9db17537 120 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 376:cb4d9db17537 121 HAL_I2C_Init(&I2cHandle);
mbed_official 376:cb4d9db17537 122 }
mbed_official 376:cb4d9db17537 123
mbed_official 439:c4382fcbbaed 124 inline int i2c_start(i2c_t *obj)
mbed_official 439:c4382fcbbaed 125 {
mbed_official 376:cb4d9db17537 126 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 127 int timeout;
mbed_official 376:cb4d9db17537 128
mbed_official 376:cb4d9db17537 129 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 130
mbed_official 376:cb4d9db17537 131 // Clear Acknowledge failure flag
mbed_official 376:cb4d9db17537 132 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 376:cb4d9db17537 133
mbed_official 376:cb4d9db17537 134 // Generate the START condition
mbed_official 376:cb4d9db17537 135 i2c->CR2 |= I2C_CR2_START;
mbed_official 376:cb4d9db17537 136
mbed_official 376:cb4d9db17537 137 // Wait the START condition has been correctly sent
mbed_official 376:cb4d9db17537 138 timeout = FLAG_TIMEOUT;
mbed_official 376:cb4d9db17537 139 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 376:cb4d9db17537 140 if ((timeout--) == 0) {
mbed_official 376:cb4d9db17537 141 return 1;
mbed_official 376:cb4d9db17537 142 }
mbed_official 376:cb4d9db17537 143 }
mbed_official 376:cb4d9db17537 144
mbed_official 376:cb4d9db17537 145 return 0;
mbed_official 376:cb4d9db17537 146 }
mbed_official 376:cb4d9db17537 147
mbed_official 439:c4382fcbbaed 148 inline int i2c_stop(i2c_t *obj)
mbed_official 439:c4382fcbbaed 149 {
mbed_official 376:cb4d9db17537 150 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 151
mbed_official 376:cb4d9db17537 152 // Generate the STOP condition
mbed_official 376:cb4d9db17537 153 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 376:cb4d9db17537 154
mbed_official 376:cb4d9db17537 155 return 0;
mbed_official 376:cb4d9db17537 156 }
mbed_official 376:cb4d9db17537 157
mbed_official 439:c4382fcbbaed 158 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 439:c4382fcbbaed 159 {
mbed_official 376:cb4d9db17537 160 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 161 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 162 int timeout;
mbed_official 376:cb4d9db17537 163 int count;
mbed_official 376:cb4d9db17537 164 int value;
mbed_official 376:cb4d9db17537 165
mbed_official 376:cb4d9db17537 166 /* update CR2 register */
mbed_official 376:cb4d9db17537 167 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 376:cb4d9db17537 168 | (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 376:cb4d9db17537 169
mbed_official 376:cb4d9db17537 170 // Read all bytes
mbed_official 376:cb4d9db17537 171 for (count = 0; count < length; count++) {
mbed_official 376:cb4d9db17537 172 value = i2c_byte_read(obj, 0);
mbed_official 376:cb4d9db17537 173 data[count] = (char)value;
mbed_official 376:cb4d9db17537 174 }
mbed_official 376:cb4d9db17537 175
mbed_official 376:cb4d9db17537 176 // Wait transfer complete
mbed_official 376:cb4d9db17537 177 timeout = FLAG_TIMEOUT;
mbed_official 376:cb4d9db17537 178 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 376:cb4d9db17537 179 timeout--;
mbed_official 376:cb4d9db17537 180 if (timeout == 0) {
mbed_official 376:cb4d9db17537 181 return -1;
mbed_official 376:cb4d9db17537 182 }
mbed_official 376:cb4d9db17537 183 }
mbed_official 376:cb4d9db17537 184
mbed_official 376:cb4d9db17537 185 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 376:cb4d9db17537 186
mbed_official 376:cb4d9db17537 187 // If not repeated start, send stop.
mbed_official 376:cb4d9db17537 188 if (stop) {
mbed_official 376:cb4d9db17537 189 i2c_stop(obj);
mbed_official 376:cb4d9db17537 190 /* Wait until STOPF flag is set */
mbed_official 376:cb4d9db17537 191 timeout = FLAG_TIMEOUT;
mbed_official 376:cb4d9db17537 192 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 376:cb4d9db17537 193 timeout--;
mbed_official 376:cb4d9db17537 194 if (timeout == 0) {
mbed_official 376:cb4d9db17537 195 return -1;
mbed_official 376:cb4d9db17537 196 }
mbed_official 376:cb4d9db17537 197 }
mbed_official 376:cb4d9db17537 198 /* Clear STOP Flag */
mbed_official 376:cb4d9db17537 199 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 376:cb4d9db17537 200 }
mbed_official 376:cb4d9db17537 201
mbed_official 376:cb4d9db17537 202 return length;
mbed_official 376:cb4d9db17537 203 }
mbed_official 376:cb4d9db17537 204
mbed_official 439:c4382fcbbaed 205 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 439:c4382fcbbaed 206 {
mbed_official 376:cb4d9db17537 207 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 208 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 209 int timeout;
mbed_official 376:cb4d9db17537 210 int count;
mbed_official 376:cb4d9db17537 211
mbed_official 376:cb4d9db17537 212 /* update CR2 register */
mbed_official 376:cb4d9db17537 213 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 376:cb4d9db17537 214 | (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 376:cb4d9db17537 215
mbed_official 376:cb4d9db17537 216 for (count = 0; count < length; count++) {
mbed_official 376:cb4d9db17537 217 i2c_byte_write(obj, data[count]);
mbed_official 376:cb4d9db17537 218 }
mbed_official 376:cb4d9db17537 219
mbed_official 376:cb4d9db17537 220 // Wait transfer complete
mbed_official 376:cb4d9db17537 221 timeout = FLAG_TIMEOUT;
mbed_official 376:cb4d9db17537 222 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 376:cb4d9db17537 223 timeout--;
mbed_official 376:cb4d9db17537 224 if (timeout == 0) {
mbed_official 376:cb4d9db17537 225 return -1;
mbed_official 376:cb4d9db17537 226 }
mbed_official 376:cb4d9db17537 227 }
mbed_official 376:cb4d9db17537 228
mbed_official 376:cb4d9db17537 229 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 376:cb4d9db17537 230
mbed_official 376:cb4d9db17537 231 // If not repeated start, send stop.
mbed_official 376:cb4d9db17537 232 if (stop) {
mbed_official 376:cb4d9db17537 233 i2c_stop(obj);
mbed_official 376:cb4d9db17537 234 /* Wait until STOPF flag is set */
mbed_official 376:cb4d9db17537 235 timeout = FLAG_TIMEOUT;
mbed_official 376:cb4d9db17537 236 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 376:cb4d9db17537 237 timeout--;
mbed_official 376:cb4d9db17537 238 if (timeout == 0) {
mbed_official 376:cb4d9db17537 239 return -1;
mbed_official 376:cb4d9db17537 240 }
mbed_official 376:cb4d9db17537 241 }
mbed_official 376:cb4d9db17537 242 /* Clear STOP Flag */
mbed_official 376:cb4d9db17537 243 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 376:cb4d9db17537 244 }
mbed_official 376:cb4d9db17537 245
mbed_official 376:cb4d9db17537 246 return count;
mbed_official 376:cb4d9db17537 247 }
mbed_official 376:cb4d9db17537 248
mbed_official 439:c4382fcbbaed 249 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 439:c4382fcbbaed 250 {
mbed_official 376:cb4d9db17537 251 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 252 int timeout;
mbed_official 376:cb4d9db17537 253
mbed_official 376:cb4d9db17537 254 // Wait until the byte is received
mbed_official 376:cb4d9db17537 255 timeout = FLAG_TIMEOUT;
mbed_official 376:cb4d9db17537 256 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 376:cb4d9db17537 257 if ((timeout--) == 0) {
mbed_official 376:cb4d9db17537 258 return -1;
mbed_official 376:cb4d9db17537 259 }
mbed_official 376:cb4d9db17537 260 }
mbed_official 376:cb4d9db17537 261
mbed_official 376:cb4d9db17537 262 return (int)i2c->RXDR;
mbed_official 376:cb4d9db17537 263 }
mbed_official 376:cb4d9db17537 264
mbed_official 439:c4382fcbbaed 265 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 439:c4382fcbbaed 266 {
mbed_official 376:cb4d9db17537 267 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 268 int timeout;
mbed_official 376:cb4d9db17537 269
mbed_official 376:cb4d9db17537 270 // Wait until the previous byte is transmitted
mbed_official 376:cb4d9db17537 271 timeout = FLAG_TIMEOUT;
mbed_official 376:cb4d9db17537 272 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 376:cb4d9db17537 273 if ((timeout--) == 0) {
mbed_official 376:cb4d9db17537 274 return 0;
mbed_official 376:cb4d9db17537 275 }
mbed_official 376:cb4d9db17537 276 }
mbed_official 376:cb4d9db17537 277
mbed_official 376:cb4d9db17537 278 i2c->TXDR = (uint8_t)data;
mbed_official 376:cb4d9db17537 279
mbed_official 376:cb4d9db17537 280 return 1;
mbed_official 376:cb4d9db17537 281 }
mbed_official 376:cb4d9db17537 282
mbed_official 439:c4382fcbbaed 283 void i2c_reset(i2c_t *obj)
mbed_official 439:c4382fcbbaed 284 {
mbed_official 376:cb4d9db17537 285 int timeout;
mbed_official 439:c4382fcbbaed 286
mbed_official 376:cb4d9db17537 287 // wait before reset
mbed_official 376:cb4d9db17537 288 timeout = LONG_TIMEOUT;
mbed_official 439:c4382fcbbaed 289 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 376:cb4d9db17537 290
mbed_official 376:cb4d9db17537 291 if (obj->i2c == I2C_1) {
mbed_official 376:cb4d9db17537 292 __I2C1_FORCE_RESET();
mbed_official 376:cb4d9db17537 293 __I2C1_RELEASE_RESET();
mbed_official 376:cb4d9db17537 294 }
mbed_official 376:cb4d9db17537 295 if (obj->i2c == I2C_2) {
mbed_official 376:cb4d9db17537 296 __I2C2_FORCE_RESET();
mbed_official 376:cb4d9db17537 297 __I2C2_RELEASE_RESET();
mbed_official 376:cb4d9db17537 298 }
mbed_official 376:cb4d9db17537 299 }
mbed_official 376:cb4d9db17537 300
mbed_official 376:cb4d9db17537 301 #if DEVICE_I2CSLAVE
mbed_official 376:cb4d9db17537 302
mbed_official 439:c4382fcbbaed 303 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 439:c4382fcbbaed 304 {
mbed_official 376:cb4d9db17537 305 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 306 uint16_t tmpreg;
mbed_official 376:cb4d9db17537 307
mbed_official 376:cb4d9db17537 308 // disable
mbed_official 376:cb4d9db17537 309 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 376:cb4d9db17537 310 // Get the old register value
mbed_official 376:cb4d9db17537 311 tmpreg = i2c->OAR1;
mbed_official 376:cb4d9db17537 312 // Reset address bits
mbed_official 376:cb4d9db17537 313 tmpreg &= 0xFC00;
mbed_official 376:cb4d9db17537 314 // Set new address
mbed_official 376:cb4d9db17537 315 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 376:cb4d9db17537 316 // Store the new register value
mbed_official 376:cb4d9db17537 317 i2c->OAR1 = tmpreg;
mbed_official 376:cb4d9db17537 318 // enable
mbed_official 376:cb4d9db17537 319 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 376:cb4d9db17537 320 }
mbed_official 376:cb4d9db17537 321
mbed_official 439:c4382fcbbaed 322 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 439:c4382fcbbaed 323 {
mbed_official 376:cb4d9db17537 324
mbed_official 376:cb4d9db17537 325 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 326 uint16_t tmpreg;
mbed_official 376:cb4d9db17537 327
mbed_official 376:cb4d9db17537 328 // Get the old register value
mbed_official 376:cb4d9db17537 329 tmpreg = i2c->OAR1;
mbed_official 376:cb4d9db17537 330
mbed_official 376:cb4d9db17537 331 // Enable / disable slave
mbed_official 376:cb4d9db17537 332 if (enable_slave == 1) {
mbed_official 376:cb4d9db17537 333 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 376:cb4d9db17537 334 } else {
mbed_official 376:cb4d9db17537 335 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 376:cb4d9db17537 336 }
mbed_official 376:cb4d9db17537 337
mbed_official 376:cb4d9db17537 338 // Set new mode
mbed_official 376:cb4d9db17537 339 i2c->OAR1 = tmpreg;
mbed_official 376:cb4d9db17537 340
mbed_official 376:cb4d9db17537 341 }
mbed_official 376:cb4d9db17537 342
mbed_official 376:cb4d9db17537 343 // See I2CSlave.h
mbed_official 376:cb4d9db17537 344 #define NoData 0 // the slave has not been addressed
mbed_official 376:cb4d9db17537 345 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 376:cb4d9db17537 346 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 376:cb4d9db17537 347 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 376:cb4d9db17537 348
mbed_official 439:c4382fcbbaed 349 int i2c_slave_receive(i2c_t *obj)
mbed_official 439:c4382fcbbaed 350 {
mbed_official 376:cb4d9db17537 351 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 352 int retValue = NoData;
mbed_official 376:cb4d9db17537 353
mbed_official 376:cb4d9db17537 354 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 376:cb4d9db17537 355 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 376:cb4d9db17537 356 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 376:cb4d9db17537 357 retValue = ReadAddressed;
mbed_official 376:cb4d9db17537 358 else
mbed_official 376:cb4d9db17537 359 retValue = WriteAddressed;
mbed_official 376:cb4d9db17537 360 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 376:cb4d9db17537 361 }
mbed_official 376:cb4d9db17537 362 }
mbed_official 376:cb4d9db17537 363
mbed_official 376:cb4d9db17537 364 return (retValue);
mbed_official 376:cb4d9db17537 365 }
mbed_official 376:cb4d9db17537 366
mbed_official 439:c4382fcbbaed 367 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 439:c4382fcbbaed 368 {
mbed_official 376:cb4d9db17537 369 char size = 0;
mbed_official 376:cb4d9db17537 370
mbed_official 376:cb4d9db17537 371 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 376:cb4d9db17537 372
mbed_official 376:cb4d9db17537 373 return size;
mbed_official 376:cb4d9db17537 374 }
mbed_official 376:cb4d9db17537 375
mbed_official 439:c4382fcbbaed 376 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 439:c4382fcbbaed 377 {
mbed_official 376:cb4d9db17537 378 char size = 0;
mbed_official 376:cb4d9db17537 379 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 380
mbed_official 376:cb4d9db17537 381 do {
mbed_official 376:cb4d9db17537 382 i2c_byte_write(obj, data[size]);
mbed_official 376:cb4d9db17537 383 size++;
mbed_official 376:cb4d9db17537 384 } while (size < length);
mbed_official 376:cb4d9db17537 385
mbed_official 376:cb4d9db17537 386 return size;
mbed_official 376:cb4d9db17537 387 }
mbed_official 376:cb4d9db17537 388
mbed_official 376:cb4d9db17537 389
mbed_official 376:cb4d9db17537 390 #endif // DEVICE_I2CSLAVE
mbed_official 376:cb4d9db17537 391
mbed_official 376:cb4d9db17537 392 #endif // DEVICE_I2C