Fawwaz Nadzmy / mbed-src

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targets/hal/TARGET_STM/TARGET_STM32L0/i2c_api.c@636:de8f3520e5c1, 2016-12-21 (annotated)

Committer:
fwndz
Date:
Wed Dec 21 12:47:52 2016 +0000
Revision:
636:de8f3520e5c1
Parent:
531:47d2b67c511f 
init

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 531:47d2b67c511f 3 * Copyright (c) 2015, 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 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 181:a4cbdfbbd2f4 31 #include "i2c_api.h"
mbed_official 181:a4cbdfbbd2f4 32
mbed_official 181:a4cbdfbbd2f4 33 #if DEVICE_I2C
mbed_official 181:a4cbdfbbd2f4 34
mbed_official 181:a4cbdfbbd2f4 35 #include "cmsis.h"
mbed_official 181:a4cbdfbbd2f4 36 #include "pinmap.h"
mbed_official 531:47d2b67c511f 37 #include "mbed_error.h"
mbed_official 414:4ec4c5b614b0 38 #include "PeripheralPins.h"
mbed_official 181:a4cbdfbbd2f4 39
mbed_official 181:a4cbdfbbd2f4 40 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 181:a4cbdfbbd2f4 41 not based on accurate values, they just guarantee that the application will
mbed_official 181:a4cbdfbbd2f4 42 not remain stuck if the I2C communication is corrupted. */
mbed_official 181:a4cbdfbbd2f4 43 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 181:a4cbdfbbd2f4 44 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 181:a4cbdfbbd2f4 45
mbed_official 181:a4cbdfbbd2f4 46 I2C_HandleTypeDef I2cHandle;
mbed_official 181:a4cbdfbbd2f4 47
mbed_official 402:09075a3b15e3 48 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
mbed_official 402:09075a3b15e3 49 {
mbed_official 489:119543c9f674 50 static int i2c1_inited = 0;
mbed_official 489:119543c9f674 51 static int i2c2_inited = 0;
mbed_official 489:119543c9f674 52 #if defined(I2C3_BASE)
mbed_official 489:119543c9f674 53 static int i2c3_inited = 0;
mbed_official 489:119543c9f674 54 #endif
mbed_official 489:119543c9f674 55
mbed_official 181:a4cbdfbbd2f4 56 // Determine the I2C to use
mbed_official 181:a4cbdfbbd2f4 57 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 181:a4cbdfbbd2f4 58 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 181:a4cbdfbbd2f4 59
mbed_official 181:a4cbdfbbd2f4 60 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 61 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 181:a4cbdfbbd2f4 62
mbed_official 305:1f0269907d8b 63 // Enable I2C1 clock and pinout if not done
mbed_official 402:09075a3b15e3 64 if ((obj->i2c == I2C_1) && !i2c1_inited) {
mbed_official 305:1f0269907d8b 65 i2c1_inited = 1;
mbed_official 210:45934c3d812a 66 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 181:a4cbdfbbd2f4 67 __I2C1_CLK_ENABLE();
mbed_official 305:1f0269907d8b 68 // Configure I2C pins
mbed_official 305:1f0269907d8b 69 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 70 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 71 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 72 pin_mode(scl, OpenDrain);
mbed_official 181:a4cbdfbbd2f4 73 }
mbed_official 489:119543c9f674 74
mbed_official 305:1f0269907d8b 75 // Enable I2C2 clock and pinout if not done
mbed_official 402:09075a3b15e3 76 if ((obj->i2c == I2C_2) && !i2c2_inited) {
mbed_official 305:1f0269907d8b 77 i2c2_inited = 1;
mbed_official 305:1f0269907d8b 78 __I2C2_CLK_ENABLE();
mbed_official 305:1f0269907d8b 79 // Configure I2C pins
mbed_official 305:1f0269907d8b 80 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 81 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 82 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 83 pin_mode(scl, OpenDrain);
mbed_official 305:1f0269907d8b 84 }
mbed_official 181:a4cbdfbbd2f4 85
mbed_official 489:119543c9f674 86 #if defined(I2C3_BASE)
mbed_official 489:119543c9f674 87 // Enable I2C3 clock and pinout if not done
mbed_official 489:119543c9f674 88 if ((obj->i2c == I2C_3) && !i2c3_inited) {
mbed_official 489:119543c9f674 89 i2c3_inited = 1;
mbed_official 489:119543c9f674 90 __I2C3_CLK_ENABLE();
mbed_official 489:119543c9f674 91 // Configure I2C pins
mbed_official 489:119543c9f674 92 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 489:119543c9f674 93 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 489:119543c9f674 94 pin_mode(sda, OpenDrain);
mbed_official 489:119543c9f674 95 pin_mode(scl, OpenDrain);
mbed_official 489:119543c9f674 96 }
mbed_official 489:119543c9f674 97 #endif
mbed_official 489:119543c9f674 98
mbed_official 181:a4cbdfbbd2f4 99 // Reset to clear pending flags if any
mbed_official 181:a4cbdfbbd2f4 100 i2c_reset(obj);
mbed_official 181:a4cbdfbbd2f4 101
mbed_official 181:a4cbdfbbd2f4 102 // I2C configuration
mbed_official 181:a4cbdfbbd2f4 103 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 181:a4cbdfbbd2f4 104 }
mbed_official 181:a4cbdfbbd2f4 105
mbed_official 402:09075a3b15e3 106 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 402:09075a3b15e3 107 {
mbed_official 227:7bd0639b8911 108 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 181:a4cbdfbbd2f4 109 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 305:1f0269907d8b 110 int timeout;
mbed_official 305:1f0269907d8b 111
mbed_official 305:1f0269907d8b 112 // wait before init
mbed_official 305:1f0269907d8b 113 timeout = LONG_TIMEOUT;
mbed_official 402:09075a3b15e3 114 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 181:a4cbdfbbd2f4 115
mbed_official 181:a4cbdfbbd2f4 116 // Common settings: I2C clock = 32 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 181:a4cbdfbbd2f4 117 switch (hz) {
mbed_official 181:a4cbdfbbd2f4 118 case 100000:
mbed_official 181:a4cbdfbbd2f4 119 I2cHandle.Init.Timing = 0x20602938; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 120 break;
mbed_official 181:a4cbdfbbd2f4 121 case 400000:
mbed_official 181:a4cbdfbbd2f4 122 I2cHandle.Init.Timing = 0x00B0122A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 123 break;
mbed_official 181:a4cbdfbbd2f4 124 case 1000000:
mbed_official 181:a4cbdfbbd2f4 125 I2cHandle.Init.Timing = 0x0030040E; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 126 break;
mbed_official 181:a4cbdfbbd2f4 127 default:
mbed_official 181:a4cbdfbbd2f4 128 break;
mbed_official 181:a4cbdfbbd2f4 129 }
mbed_official 181:a4cbdfbbd2f4 130
mbed_official 181:a4cbdfbbd2f4 131 // I2C configuration
mbed_official 181:a4cbdfbbd2f4 132 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 181:a4cbdfbbd2f4 133 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 181:a4cbdfbbd2f4 134 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 181:a4cbdfbbd2f4 135 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 181:a4cbdfbbd2f4 136 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 181:a4cbdfbbd2f4 137 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 181:a4cbdfbbd2f4 138 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 531:47d2b67c511f 139
mbed_official 531:47d2b67c511f 140 if (HAL_I2C_Init(&I2cHandle) != HAL_OK) {
mbed_official 531:47d2b67c511f 141 error("Cannot initialize I2C");
mbed_official 531:47d2b67c511f 142 }
mbed_official 181:a4cbdfbbd2f4 143 }
mbed_official 181:a4cbdfbbd2f4 144
mbed_official 402:09075a3b15e3 145 inline int i2c_start(i2c_t *obj)
mbed_official 402:09075a3b15e3 146 {
mbed_official 181:a4cbdfbbd2f4 147 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 148 int timeout;
mbed_official 181:a4cbdfbbd2f4 149
mbed_official 181:a4cbdfbbd2f4 150 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 151
mbed_official 181:a4cbdfbbd2f4 152 // Clear Acknowledge failure flag
mbed_official 181:a4cbdfbbd2f4 153 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 181:a4cbdfbbd2f4 154
mbed_official 181:a4cbdfbbd2f4 155 // Generate the START condition
mbed_official 181:a4cbdfbbd2f4 156 i2c->CR2 |= I2C_CR2_START;
mbed_official 181:a4cbdfbbd2f4 157
mbed_official 181:a4cbdfbbd2f4 158 // Wait the START condition has been correctly sent
mbed_official 181:a4cbdfbbd2f4 159 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 160 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 181:a4cbdfbbd2f4 161 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 162 return 1;
mbed_official 181:a4cbdfbbd2f4 163 }
mbed_official 181:a4cbdfbbd2f4 164 }
mbed_official 181:a4cbdfbbd2f4 165
mbed_official 181:a4cbdfbbd2f4 166 return 0;
mbed_official 181:a4cbdfbbd2f4 167 }
mbed_official 181:a4cbdfbbd2f4 168
mbed_official 402:09075a3b15e3 169 inline int i2c_stop(i2c_t *obj)
mbed_official 402:09075a3b15e3 170 {
mbed_official 181:a4cbdfbbd2f4 171 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 172
mbed_official 181:a4cbdfbbd2f4 173 // Generate the STOP condition
mbed_official 181:a4cbdfbbd2f4 174 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 181:a4cbdfbbd2f4 175
mbed_official 181:a4cbdfbbd2f4 176 return 0;
mbed_official 181:a4cbdfbbd2f4 177 }
mbed_official 181:a4cbdfbbd2f4 178
mbed_official 402:09075a3b15e3 179 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 402:09075a3b15e3 180 {
mbed_official 202:bd6461c07541 181 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 182 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 183 int timeout;
mbed_official 202:bd6461c07541 184 int count;
mbed_official 202:bd6461c07541 185 int value;
mbed_official 202:bd6461c07541 186
mbed_official 202:bd6461c07541 187 /* update CR2 register */
mbed_official 202:bd6461c07541 188 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 211:fb8edfff6ae1 189 | (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 211:fb8edfff6ae1 190
mbed_official 202:bd6461c07541 191 // Read all bytes
mbed_official 202:bd6461c07541 192 for (count = 0; count < length; count++) {
mbed_official 202:bd6461c07541 193 value = i2c_byte_read(obj, 0);
mbed_official 202:bd6461c07541 194 data[count] = (char)value;
mbed_official 202:bd6461c07541 195 }
mbed_official 181:a4cbdfbbd2f4 196
mbed_official 202:bd6461c07541 197 // Wait transfer complete
mbed_official 202:bd6461c07541 198 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 199 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 202:bd6461c07541 200 timeout--;
mbed_official 202:bd6461c07541 201 if (timeout == 0) {
mbed_official 247:135e3186a638 202 return -1;
mbed_official 202:bd6461c07541 203 }
mbed_official 202:bd6461c07541 204 }
mbed_official 211:fb8edfff6ae1 205
mbed_official 211:fb8edfff6ae1 206 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 202:bd6461c07541 207
mbed_official 202:bd6461c07541 208 // If not repeated start, send stop.
mbed_official 202:bd6461c07541 209 if (stop) {
mbed_official 202:bd6461c07541 210 i2c_stop(obj);
mbed_official 202:bd6461c07541 211 /* Wait until STOPF flag is set */
mbed_official 202:bd6461c07541 212 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 213 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 202:bd6461c07541 214 timeout--;
mbed_official 202:bd6461c07541 215 if (timeout == 0) {
mbed_official 247:135e3186a638 216 return -1;
mbed_official 202:bd6461c07541 217 }
mbed_official 202:bd6461c07541 218 }
mbed_official 202:bd6461c07541 219 /* Clear STOP Flag */
mbed_official 202:bd6461c07541 220 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 181:a4cbdfbbd2f4 221 }
mbed_official 181:a4cbdfbbd2f4 222
mbed_official 181:a4cbdfbbd2f4 223 return length;
mbed_official 181:a4cbdfbbd2f4 224 }
mbed_official 181:a4cbdfbbd2f4 225
mbed_official 402:09075a3b15e3 226 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 402:09075a3b15e3 227 {
mbed_official 202:bd6461c07541 228 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 229 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 230 int timeout;
mbed_official 202:bd6461c07541 231 int count;
mbed_official 202:bd6461c07541 232
mbed_official 202:bd6461c07541 233 /* update CR2 register */
mbed_official 202:bd6461c07541 234 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 211:fb8edfff6ae1 235 | (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 181:a4cbdfbbd2f4 236
mbed_official 202:bd6461c07541 237 for (count = 0; count < length; count++) {
mbed_official 202:bd6461c07541 238 i2c_byte_write(obj, data[count]);
mbed_official 181:a4cbdfbbd2f4 239 }
mbed_official 181:a4cbdfbbd2f4 240
mbed_official 202:bd6461c07541 241 // Wait transfer complete
mbed_official 202:bd6461c07541 242 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 243 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 202:bd6461c07541 244 timeout--;
mbed_official 202:bd6461c07541 245 if (timeout == 0) {
mbed_official 247:135e3186a638 246 return -1;
mbed_official 211:fb8edfff6ae1 247 }
mbed_official 202:bd6461c07541 248 }
mbed_official 211:fb8edfff6ae1 249
mbed_official 211:fb8edfff6ae1 250 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 202:bd6461c07541 251
mbed_official 202:bd6461c07541 252 // If not repeated start, send stop.
mbed_official 202:bd6461c07541 253 if (stop) {
mbed_official 202:bd6461c07541 254 i2c_stop(obj);
mbed_official 202:bd6461c07541 255 /* Wait until STOPF flag is set */
mbed_official 202:bd6461c07541 256 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 257 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 202:bd6461c07541 258 timeout--;
mbed_official 202:bd6461c07541 259 if (timeout == 0) {
mbed_official 247:135e3186a638 260 return -1;
mbed_official 202:bd6461c07541 261 }
mbed_official 202:bd6461c07541 262 }
mbed_official 202:bd6461c07541 263 /* Clear STOP Flag */
mbed_official 202:bd6461c07541 264 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 202:bd6461c07541 265 }
mbed_official 202:bd6461c07541 266
mbed_official 202:bd6461c07541 267 return count;
mbed_official 181:a4cbdfbbd2f4 268 }
mbed_official 181:a4cbdfbbd2f4 269
mbed_official 402:09075a3b15e3 270 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 402:09075a3b15e3 271 {
mbed_official 181:a4cbdfbbd2f4 272 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 273 int timeout;
mbed_official 181:a4cbdfbbd2f4 274
mbed_official 181:a4cbdfbbd2f4 275 // Wait until the byte is received
mbed_official 181:a4cbdfbbd2f4 276 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 277 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 278 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 279 return -1;
mbed_official 181:a4cbdfbbd2f4 280 }
mbed_official 181:a4cbdfbbd2f4 281 }
mbed_official 181:a4cbdfbbd2f4 282
mbed_official 181:a4cbdfbbd2f4 283 return (int)i2c->RXDR;
mbed_official 181:a4cbdfbbd2f4 284 }
mbed_official 181:a4cbdfbbd2f4 285
mbed_official 402:09075a3b15e3 286 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 402:09075a3b15e3 287 {
mbed_official 181:a4cbdfbbd2f4 288 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 289 int timeout;
mbed_official 181:a4cbdfbbd2f4 290
mbed_official 202:bd6461c07541 291 // Wait until the previous byte is transmitted
mbed_official 181:a4cbdfbbd2f4 292 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 293 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 181:a4cbdfbbd2f4 294 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 295 return 0;
mbed_official 181:a4cbdfbbd2f4 296 }
mbed_official 181:a4cbdfbbd2f4 297 }
mbed_official 181:a4cbdfbbd2f4 298
mbed_official 202:bd6461c07541 299 i2c->TXDR = (uint8_t)data;
mbed_official 211:fb8edfff6ae1 300
mbed_official 181:a4cbdfbbd2f4 301 return 1;
mbed_official 181:a4cbdfbbd2f4 302 }
mbed_official 181:a4cbdfbbd2f4 303
mbed_official 402:09075a3b15e3 304 void i2c_reset(i2c_t *obj)
mbed_official 402:09075a3b15e3 305 {
mbed_official 305:1f0269907d8b 306 int timeout;
mbed_official 402:09075a3b15e3 307
mbed_official 305:1f0269907d8b 308 // wait before reset
mbed_official 305:1f0269907d8b 309 timeout = LONG_TIMEOUT;
mbed_official 402:09075a3b15e3 310 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 305:1f0269907d8b 311
mbed_official 181:a4cbdfbbd2f4 312 if (obj->i2c == I2C_1) {
mbed_official 181:a4cbdfbbd2f4 313 __I2C1_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 314 __I2C1_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 315 }
mbed_official 181:a4cbdfbbd2f4 316 if (obj->i2c == I2C_2) {
mbed_official 181:a4cbdfbbd2f4 317 __I2C2_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 318 __I2C2_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 319 }
mbed_official 181:a4cbdfbbd2f4 320 }
mbed_official 181:a4cbdfbbd2f4 321
mbed_official 181:a4cbdfbbd2f4 322 #if DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 323
mbed_official 402:09075a3b15e3 324 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 402:09075a3b15e3 325 {
mbed_official 181:a4cbdfbbd2f4 326 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 327 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 328
mbed_official 181:a4cbdfbbd2f4 329 // disable
mbed_official 202:bd6461c07541 330 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 331 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 332 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 333 // Reset address bits
mbed_official 181:a4cbdfbbd2f4 334 tmpreg &= 0xFC00;
mbed_official 181:a4cbdfbbd2f4 335 // Set new address
mbed_official 181:a4cbdfbbd2f4 336 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 181:a4cbdfbbd2f4 337 // Store the new register value
mbed_official 181:a4cbdfbbd2f4 338 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 339 // enable
mbed_official 181:a4cbdfbbd2f4 340 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 341 }
mbed_official 181:a4cbdfbbd2f4 342
mbed_official 402:09075a3b15e3 343 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 402:09075a3b15e3 344 {
mbed_official 181:a4cbdfbbd2f4 345
mbed_official 181:a4cbdfbbd2f4 346 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 347 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 348
mbed_official 181:a4cbdfbbd2f4 349 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 350 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 351
mbed_official 181:a4cbdfbbd2f4 352 // Enable / disable slave
mbed_official 181:a4cbdfbbd2f4 353 if (enable_slave == 1) {
mbed_official 181:a4cbdfbbd2f4 354 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 355 } else {
mbed_official 202:bd6461c07541 356 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 357 }
mbed_official 181:a4cbdfbbd2f4 358
mbed_official 181:a4cbdfbbd2f4 359 // Set new mode
mbed_official 181:a4cbdfbbd2f4 360 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 361
mbed_official 181:a4cbdfbbd2f4 362 }
mbed_official 181:a4cbdfbbd2f4 363
mbed_official 181:a4cbdfbbd2f4 364 // See I2CSlave.h
mbed_official 181:a4cbdfbbd2f4 365 #define NoData 0 // the slave has not been addressed
mbed_official 181:a4cbdfbbd2f4 366 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 181:a4cbdfbbd2f4 367 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 181:a4cbdfbbd2f4 368 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 181:a4cbdfbbd2f4 369
mbed_official 402:09075a3b15e3 370 int i2c_slave_receive(i2c_t *obj)
mbed_official 402:09075a3b15e3 371 {
mbed_official 202:bd6461c07541 372 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 373 int retValue = NoData;
mbed_official 181:a4cbdfbbd2f4 374
mbed_official 181:a4cbdfbbd2f4 375 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 181:a4cbdfbbd2f4 376 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 181:a4cbdfbbd2f4 377 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 181:a4cbdfbbd2f4 378 retValue = ReadAddressed;
mbed_official 181:a4cbdfbbd2f4 379 else
mbed_official 181:a4cbdfbbd2f4 380 retValue = WriteAddressed;
mbed_official 181:a4cbdfbbd2f4 381 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 181:a4cbdfbbd2f4 382 }
mbed_official 181:a4cbdfbbd2f4 383 }
mbed_official 181:a4cbdfbbd2f4 384
mbed_official 181:a4cbdfbbd2f4 385 return (retValue);
mbed_official 181:a4cbdfbbd2f4 386 }
mbed_official 181:a4cbdfbbd2f4 387
mbed_official 402:09075a3b15e3 388 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 402:09075a3b15e3 389 {
mbed_official 202:bd6461c07541 390 char size = 0;
mbed_official 211:fb8edfff6ae1 391
mbed_official 202:bd6461c07541 392 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 181:a4cbdfbbd2f4 393
mbed_official 202:bd6461c07541 394 return size;
mbed_official 181:a4cbdfbbd2f4 395 }
mbed_official 181:a4cbdfbbd2f4 396
mbed_official 402:09075a3b15e3 397 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 402:09075a3b15e3 398 {
mbed_official 181:a4cbdfbbd2f4 399 char size = 0;
mbed_official 202:bd6461c07541 400 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 401
mbed_official 181:a4cbdfbbd2f4 402 do {
mbed_official 181:a4cbdfbbd2f4 403 i2c_byte_write(obj, data[size]);
mbed_official 181:a4cbdfbbd2f4 404 size++;
mbed_official 181:a4cbdfbbd2f4 405 } while (size < length);
mbed_official 181:a4cbdfbbd2f4 406
mbed_official 181:a4cbdfbbd2f4 407 return size;
mbed_official 181:a4cbdfbbd2f4 408 }
mbed_official 181:a4cbdfbbd2f4 409
mbed_official 181:a4cbdfbbd2f4 410
mbed_official 181:a4cbdfbbd2f4 411 #endif // DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 412
mbed_official 181:a4cbdfbbd2f4 413 #endif // DEVICE_I2C