Zakaria ElQotbi / mbed-src

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targets/hal/TARGET_STM/TARGET_NUCLEO_L053R8/i2c_api.c@414:4ec4c5b614b0, 2014-11-25 (annotated)

Committer:
mbed_official
Date:
Tue Nov 25 07:15:09 2014 +0000
Revision:
414:4ec4c5b614b0
Parent:
402:09075a3b15e3
Child:
489:119543c9f674
Synchronized with git revision fbc74e874ac089c6cb05add312fb5422be628886



Full URL: https://github.com/mbedmicro/mbed/commit/fbc74e874ac089c6cb05add312fb5422be628886/



Targets: NUCLEOs - Add PeripheralPins files for all nucleo targets

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