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@376:cb4d9db17537, 2014-10-31 (annotated)

Committer:
mbed_official
Date:
Fri Oct 31 11:00:10 2014 +0000
Revision:
376:cb4d9db17537
Child:
439:c4382fcbbaed
Synchronized with git revision 07b49da75eac883fc8916d3d6b6962664b8db29e



Full URL: https://github.com/mbedmicro/mbed/commit/07b49da75eac883fc8916d3d6b6962664b8db29e/



Targets: DISCO_L053C8 - new platform - STM32L0 Discovery board

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 376:cb4d9db17537 37 #include "mbed_error.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 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 376:cb4d9db17537 46 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 376:cb4d9db17537 47 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 376:cb4d9db17537 48 {PB_11, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF6_I2C2)},
mbed_official 376:cb4d9db17537 49 {PB_14, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 376:cb4d9db17537 50 {NC, NC, 0}
mbed_official 376:cb4d9db17537 51 };
mbed_official 376:cb4d9db17537 52
mbed_official 376:cb4d9db17537 53 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 376:cb4d9db17537 54 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 376:cb4d9db17537 55 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 376:cb4d9db17537 56 {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF6_I2C2)},
mbed_official 376:cb4d9db17537 57 {PB_13, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 376:cb4d9db17537 58 {NC, NC, 0}
mbed_official 376:cb4d9db17537 59 };
mbed_official 376:cb4d9db17537 60
mbed_official 376:cb4d9db17537 61 I2C_HandleTypeDef I2cHandle;
mbed_official 376:cb4d9db17537 62
mbed_official 376:cb4d9db17537 63 int i2c1_inited = 0;
mbed_official 376:cb4d9db17537 64 int i2c2_inited = 0;
mbed_official 376:cb4d9db17537 65
mbed_official 376:cb4d9db17537 66 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 376:cb4d9db17537 67 // Determine the I2C to use
mbed_official 376:cb4d9db17537 68 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 376:cb4d9db17537 69 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 376:cb4d9db17537 70
mbed_official 376:cb4d9db17537 71 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 376:cb4d9db17537 72 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 376:cb4d9db17537 73
mbed_official 376:cb4d9db17537 74 // Enable I2C1 clock and pinout if not done
mbed_official 376:cb4d9db17537 75 if ((obj->i2c == I2C_1)&& !i2c1_inited) {
mbed_official 376:cb4d9db17537 76 i2c1_inited = 1;
mbed_official 376:cb4d9db17537 77 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 376:cb4d9db17537 78 __I2C1_CLK_ENABLE();
mbed_official 376:cb4d9db17537 79 // Configure I2C pins
mbed_official 376:cb4d9db17537 80 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 376:cb4d9db17537 81 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 376:cb4d9db17537 82 pin_mode(sda, OpenDrain);
mbed_official 376:cb4d9db17537 83 pin_mode(scl, OpenDrain);
mbed_official 376:cb4d9db17537 84 }
mbed_official 376:cb4d9db17537 85 // Enable I2C2 clock and pinout if not done
mbed_official 376:cb4d9db17537 86 if ((obj->i2c == I2C_2)&& !i2c2_inited) {
mbed_official 376:cb4d9db17537 87 i2c2_inited = 1;
mbed_official 376:cb4d9db17537 88 __I2C2_CLK_ENABLE();
mbed_official 376:cb4d9db17537 89 // Configure I2C pins
mbed_official 376:cb4d9db17537 90 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 376:cb4d9db17537 91 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 376:cb4d9db17537 92 pin_mode(sda, OpenDrain);
mbed_official 376:cb4d9db17537 93 pin_mode(scl, OpenDrain);
mbed_official 376:cb4d9db17537 94 }
mbed_official 376:cb4d9db17537 95
mbed_official 376:cb4d9db17537 96 // Reset to clear pending flags if any
mbed_official 376:cb4d9db17537 97 i2c_reset(obj);
mbed_official 376:cb4d9db17537 98
mbed_official 376:cb4d9db17537 99 // I2C configuration
mbed_official 376:cb4d9db17537 100 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 376:cb4d9db17537 101 }
mbed_official 376:cb4d9db17537 102
mbed_official 376:cb4d9db17537 103 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 376:cb4d9db17537 104 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 376:cb4d9db17537 105 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 106 int timeout;
mbed_official 376:cb4d9db17537 107
mbed_official 376:cb4d9db17537 108 // wait before init
mbed_official 376:cb4d9db17537 109 timeout = LONG_TIMEOUT;
mbed_official 376:cb4d9db17537 110 while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 376:cb4d9db17537 111
mbed_official 376:cb4d9db17537 112 // Common settings: I2C clock = 32 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 376:cb4d9db17537 113 switch (hz) {
mbed_official 376:cb4d9db17537 114 case 100000:
mbed_official 376:cb4d9db17537 115 I2cHandle.Init.Timing = 0x20602938; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 376:cb4d9db17537 116 break;
mbed_official 376:cb4d9db17537 117 case 400000:
mbed_official 376:cb4d9db17537 118 I2cHandle.Init.Timing = 0x00B0122A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 376:cb4d9db17537 119 break;
mbed_official 376:cb4d9db17537 120 case 1000000:
mbed_official 376:cb4d9db17537 121 I2cHandle.Init.Timing = 0x0030040E; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 376:cb4d9db17537 122 break;
mbed_official 376:cb4d9db17537 123 default:
mbed_official 376:cb4d9db17537 124 break;
mbed_official 376:cb4d9db17537 125 }
mbed_official 376:cb4d9db17537 126
mbed_official 376:cb4d9db17537 127 // I2C configuration
mbed_official 376:cb4d9db17537 128 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 376:cb4d9db17537 129 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 376:cb4d9db17537 130 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 376:cb4d9db17537 131 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 376:cb4d9db17537 132 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 376:cb4d9db17537 133 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 376:cb4d9db17537 134 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 376:cb4d9db17537 135 HAL_I2C_Init(&I2cHandle);
mbed_official 376:cb4d9db17537 136 }
mbed_official 376:cb4d9db17537 137
mbed_official 376:cb4d9db17537 138 inline int i2c_start(i2c_t *obj) {
mbed_official 376:cb4d9db17537 139 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 140 int timeout;
mbed_official 376:cb4d9db17537 141
mbed_official 376:cb4d9db17537 142 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 143
mbed_official 376:cb4d9db17537 144 // Clear Acknowledge failure flag
mbed_official 376:cb4d9db17537 145 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 376:cb4d9db17537 146
mbed_official 376:cb4d9db17537 147 // Generate the START condition
mbed_official 376:cb4d9db17537 148 i2c->CR2 |= I2C_CR2_START;
mbed_official 376:cb4d9db17537 149
mbed_official 376:cb4d9db17537 150 // Wait the START condition has been correctly sent
mbed_official 376:cb4d9db17537 151 timeout = FLAG_TIMEOUT;
mbed_official 376:cb4d9db17537 152 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 376:cb4d9db17537 153 if ((timeout--) == 0) {
mbed_official 376:cb4d9db17537 154 return 1;
mbed_official 376:cb4d9db17537 155 }
mbed_official 376:cb4d9db17537 156 }
mbed_official 376:cb4d9db17537 157
mbed_official 376:cb4d9db17537 158 return 0;
mbed_official 376:cb4d9db17537 159 }
mbed_official 376:cb4d9db17537 160
mbed_official 376:cb4d9db17537 161 inline int i2c_stop(i2c_t *obj) {
mbed_official 376:cb4d9db17537 162 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 163
mbed_official 376:cb4d9db17537 164 // Generate the STOP condition
mbed_official 376:cb4d9db17537 165 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 376:cb4d9db17537 166
mbed_official 376:cb4d9db17537 167 return 0;
mbed_official 376:cb4d9db17537 168 }
mbed_official 376:cb4d9db17537 169
mbed_official 376:cb4d9db17537 170 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 376:cb4d9db17537 171 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 172 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 173 int timeout;
mbed_official 376:cb4d9db17537 174 int count;
mbed_official 376:cb4d9db17537 175 int value;
mbed_official 376:cb4d9db17537 176
mbed_official 376:cb4d9db17537 177 /* update CR2 register */
mbed_official 376:cb4d9db17537 178 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 179 | (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 180
mbed_official 376:cb4d9db17537 181 // Read all bytes
mbed_official 376:cb4d9db17537 182 for (count = 0; count < length; count++) {
mbed_official 376:cb4d9db17537 183 value = i2c_byte_read(obj, 0);
mbed_official 376:cb4d9db17537 184 data[count] = (char)value;
mbed_official 376:cb4d9db17537 185 }
mbed_official 376:cb4d9db17537 186
mbed_official 376:cb4d9db17537 187 // Wait transfer complete
mbed_official 376:cb4d9db17537 188 timeout = FLAG_TIMEOUT;
mbed_official 376:cb4d9db17537 189 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 376:cb4d9db17537 190 timeout--;
mbed_official 376:cb4d9db17537 191 if (timeout == 0) {
mbed_official 376:cb4d9db17537 192 return -1;
mbed_official 376:cb4d9db17537 193 }
mbed_official 376:cb4d9db17537 194 }
mbed_official 376:cb4d9db17537 195
mbed_official 376:cb4d9db17537 196 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 376:cb4d9db17537 197
mbed_official 376:cb4d9db17537 198 // If not repeated start, send stop.
mbed_official 376:cb4d9db17537 199 if (stop) {
mbed_official 376:cb4d9db17537 200 i2c_stop(obj);
mbed_official 376:cb4d9db17537 201 /* Wait until STOPF flag is set */
mbed_official 376:cb4d9db17537 202 timeout = FLAG_TIMEOUT;
mbed_official 376:cb4d9db17537 203 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 376:cb4d9db17537 204 timeout--;
mbed_official 376:cb4d9db17537 205 if (timeout == 0) {
mbed_official 376:cb4d9db17537 206 return -1;
mbed_official 376:cb4d9db17537 207 }
mbed_official 376:cb4d9db17537 208 }
mbed_official 376:cb4d9db17537 209 /* Clear STOP Flag */
mbed_official 376:cb4d9db17537 210 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 376:cb4d9db17537 211 }
mbed_official 376:cb4d9db17537 212
mbed_official 376:cb4d9db17537 213 return length;
mbed_official 376:cb4d9db17537 214 }
mbed_official 376:cb4d9db17537 215
mbed_official 376:cb4d9db17537 216 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 376:cb4d9db17537 217 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 218 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 219 int timeout;
mbed_official 376:cb4d9db17537 220 int count;
mbed_official 376:cb4d9db17537 221
mbed_official 376:cb4d9db17537 222 /* update CR2 register */
mbed_official 376:cb4d9db17537 223 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 224 | (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 225
mbed_official 376:cb4d9db17537 226 for (count = 0; count < length; count++) {
mbed_official 376:cb4d9db17537 227 i2c_byte_write(obj, data[count]);
mbed_official 376:cb4d9db17537 228 }
mbed_official 376:cb4d9db17537 229
mbed_official 376:cb4d9db17537 230 // Wait transfer complete
mbed_official 376:cb4d9db17537 231 timeout = FLAG_TIMEOUT;
mbed_official 376:cb4d9db17537 232 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 376:cb4d9db17537 233 timeout--;
mbed_official 376:cb4d9db17537 234 if (timeout == 0) {
mbed_official 376:cb4d9db17537 235 return -1;
mbed_official 376:cb4d9db17537 236 }
mbed_official 376:cb4d9db17537 237 }
mbed_official 376:cb4d9db17537 238
mbed_official 376:cb4d9db17537 239 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 376:cb4d9db17537 240
mbed_official 376:cb4d9db17537 241 // If not repeated start, send stop.
mbed_official 376:cb4d9db17537 242 if (stop) {
mbed_official 376:cb4d9db17537 243 i2c_stop(obj);
mbed_official 376:cb4d9db17537 244 /* Wait until STOPF flag is set */
mbed_official 376:cb4d9db17537 245 timeout = FLAG_TIMEOUT;
mbed_official 376:cb4d9db17537 246 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 376:cb4d9db17537 247 timeout--;
mbed_official 376:cb4d9db17537 248 if (timeout == 0) {
mbed_official 376:cb4d9db17537 249 return -1;
mbed_official 376:cb4d9db17537 250 }
mbed_official 376:cb4d9db17537 251 }
mbed_official 376:cb4d9db17537 252 /* Clear STOP Flag */
mbed_official 376:cb4d9db17537 253 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 376:cb4d9db17537 254 }
mbed_official 376:cb4d9db17537 255
mbed_official 376:cb4d9db17537 256 return count;
mbed_official 376:cb4d9db17537 257 }
mbed_official 376:cb4d9db17537 258
mbed_official 376:cb4d9db17537 259 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 376:cb4d9db17537 260 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 261 int timeout;
mbed_official 376:cb4d9db17537 262
mbed_official 376:cb4d9db17537 263 // Wait until the byte is received
mbed_official 376:cb4d9db17537 264 timeout = FLAG_TIMEOUT;
mbed_official 376:cb4d9db17537 265 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 376:cb4d9db17537 266 if ((timeout--) == 0) {
mbed_official 376:cb4d9db17537 267 return -1;
mbed_official 376:cb4d9db17537 268 }
mbed_official 376:cb4d9db17537 269 }
mbed_official 376:cb4d9db17537 270
mbed_official 376:cb4d9db17537 271 return (int)i2c->RXDR;
mbed_official 376:cb4d9db17537 272 }
mbed_official 376:cb4d9db17537 273
mbed_official 376:cb4d9db17537 274 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 376:cb4d9db17537 275 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 276 int timeout;
mbed_official 376:cb4d9db17537 277
mbed_official 376:cb4d9db17537 278 // Wait until the previous byte is transmitted
mbed_official 376:cb4d9db17537 279 timeout = FLAG_TIMEOUT;
mbed_official 376:cb4d9db17537 280 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 376:cb4d9db17537 281 if ((timeout--) == 0) {
mbed_official 376:cb4d9db17537 282 return 0;
mbed_official 376:cb4d9db17537 283 }
mbed_official 376:cb4d9db17537 284 }
mbed_official 376:cb4d9db17537 285
mbed_official 376:cb4d9db17537 286 i2c->TXDR = (uint8_t)data;
mbed_official 376:cb4d9db17537 287
mbed_official 376:cb4d9db17537 288 return 1;
mbed_official 376:cb4d9db17537 289 }
mbed_official 376:cb4d9db17537 290
mbed_official 376:cb4d9db17537 291 void i2c_reset(i2c_t *obj) {
mbed_official 376:cb4d9db17537 292 int timeout;
mbed_official 376:cb4d9db17537 293
mbed_official 376:cb4d9db17537 294 // wait before reset
mbed_official 376:cb4d9db17537 295 timeout = LONG_TIMEOUT;
mbed_official 376:cb4d9db17537 296 while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 376:cb4d9db17537 297
mbed_official 376:cb4d9db17537 298 if (obj->i2c == I2C_1) {
mbed_official 376:cb4d9db17537 299 __I2C1_FORCE_RESET();
mbed_official 376:cb4d9db17537 300 __I2C1_RELEASE_RESET();
mbed_official 376:cb4d9db17537 301 }
mbed_official 376:cb4d9db17537 302 if (obj->i2c == I2C_2) {
mbed_official 376:cb4d9db17537 303 __I2C2_FORCE_RESET();
mbed_official 376:cb4d9db17537 304 __I2C2_RELEASE_RESET();
mbed_official 376:cb4d9db17537 305 }
mbed_official 376:cb4d9db17537 306 }
mbed_official 376:cb4d9db17537 307
mbed_official 376:cb4d9db17537 308 #if DEVICE_I2CSLAVE
mbed_official 376:cb4d9db17537 309
mbed_official 376:cb4d9db17537 310 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 376:cb4d9db17537 311 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 312 uint16_t tmpreg;
mbed_official 376:cb4d9db17537 313
mbed_official 376:cb4d9db17537 314 // disable
mbed_official 376:cb4d9db17537 315 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 376:cb4d9db17537 316 // Get the old register value
mbed_official 376:cb4d9db17537 317 tmpreg = i2c->OAR1;
mbed_official 376:cb4d9db17537 318 // Reset address bits
mbed_official 376:cb4d9db17537 319 tmpreg &= 0xFC00;
mbed_official 376:cb4d9db17537 320 // Set new address
mbed_official 376:cb4d9db17537 321 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 376:cb4d9db17537 322 // Store the new register value
mbed_official 376:cb4d9db17537 323 i2c->OAR1 = tmpreg;
mbed_official 376:cb4d9db17537 324 // enable
mbed_official 376:cb4d9db17537 325 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 376:cb4d9db17537 326 }
mbed_official 376:cb4d9db17537 327
mbed_official 376:cb4d9db17537 328 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 376:cb4d9db17537 329
mbed_official 376:cb4d9db17537 330 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 331 uint16_t tmpreg;
mbed_official 376:cb4d9db17537 332
mbed_official 376:cb4d9db17537 333 // Get the old register value
mbed_official 376:cb4d9db17537 334 tmpreg = i2c->OAR1;
mbed_official 376:cb4d9db17537 335
mbed_official 376:cb4d9db17537 336 // Enable / disable slave
mbed_official 376:cb4d9db17537 337 if (enable_slave == 1) {
mbed_official 376:cb4d9db17537 338 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 376:cb4d9db17537 339 } else {
mbed_official 376:cb4d9db17537 340 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 376:cb4d9db17537 341 }
mbed_official 376:cb4d9db17537 342
mbed_official 376:cb4d9db17537 343 // Set new mode
mbed_official 376:cb4d9db17537 344 i2c->OAR1 = tmpreg;
mbed_official 376:cb4d9db17537 345
mbed_official 376:cb4d9db17537 346 }
mbed_official 376:cb4d9db17537 347
mbed_official 376:cb4d9db17537 348 // See I2CSlave.h
mbed_official 376:cb4d9db17537 349 #define NoData 0 // the slave has not been addressed
mbed_official 376:cb4d9db17537 350 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 376:cb4d9db17537 351 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 376:cb4d9db17537 352 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 376:cb4d9db17537 353
mbed_official 376:cb4d9db17537 354 int i2c_slave_receive(i2c_t *obj) {
mbed_official 376:cb4d9db17537 355 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 356 int retValue = NoData;
mbed_official 376:cb4d9db17537 357
mbed_official 376:cb4d9db17537 358 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 376:cb4d9db17537 359 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 376:cb4d9db17537 360 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 376:cb4d9db17537 361 retValue = ReadAddressed;
mbed_official 376:cb4d9db17537 362 else
mbed_official 376:cb4d9db17537 363 retValue = WriteAddressed;
mbed_official 376:cb4d9db17537 364 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 376:cb4d9db17537 365 }
mbed_official 376:cb4d9db17537 366 }
mbed_official 376:cb4d9db17537 367
mbed_official 376:cb4d9db17537 368 return (retValue);
mbed_official 376:cb4d9db17537 369 }
mbed_official 376:cb4d9db17537 370
mbed_official 376:cb4d9db17537 371 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 376:cb4d9db17537 372 char size = 0;
mbed_official 376:cb4d9db17537 373
mbed_official 376:cb4d9db17537 374 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 376:cb4d9db17537 375
mbed_official 376:cb4d9db17537 376 return size;
mbed_official 376:cb4d9db17537 377 }
mbed_official 376:cb4d9db17537 378
mbed_official 376:cb4d9db17537 379 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 376:cb4d9db17537 380 char size = 0;
mbed_official 376:cb4d9db17537 381 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 376:cb4d9db17537 382
mbed_official 376:cb4d9db17537 383 do {
mbed_official 376:cb4d9db17537 384 i2c_byte_write(obj, data[size]);
mbed_official 376:cb4d9db17537 385 size++;
mbed_official 376:cb4d9db17537 386 } while (size < length);
mbed_official 376:cb4d9db17537 387
mbed_official 376:cb4d9db17537 388 return size;
mbed_official 376:cb4d9db17537 389 }
mbed_official 376:cb4d9db17537 390
mbed_official 376:cb4d9db17537 391
mbed_official 376:cb4d9db17537 392 #endif // DEVICE_I2CSLAVE
mbed_official 376:cb4d9db17537 393
mbed_official 376:cb4d9db17537 394 #endif // DEVICE_I2C