erkin yucel / mbed-os

mbed os with nrf51 internal bandgap enabled to read battery level

Dependents:   BLE_file_test BLE_Blink ExternalEncoder

targets/TARGET_STM/TARGET_STM32L0/i2c_api.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 *******************************************************************************
elessair 0:f269e3021894 3 * Copyright (c) 2015, STMicroelectronics
elessair 0:f269e3021894 4 * All rights reserved.
elessair 0:f269e3021894 5 *
elessair 0:f269e3021894 6 * Redistribution and use in source and binary forms, with or without
elessair 0:f269e3021894 7 * modification, are permitted provided that the following conditions are met:
elessair 0:f269e3021894 8 *
elessair 0:f269e3021894 9 * 1. Redistributions of source code must retain the above copyright notice,
elessair 0:f269e3021894 10 * this list of conditions and the following disclaimer.
elessair 0:f269e3021894 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
elessair 0:f269e3021894 12 * this list of conditions and the following disclaimer in the documentation
elessair 0:f269e3021894 13 * and/or other materials provided with the distribution.
elessair 0:f269e3021894 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
elessair 0:f269e3021894 15 * may be used to endorse or promote products derived from this software
elessair 0:f269e3021894 16 * without specific prior written permission.
elessair 0:f269e3021894 17 *
elessair 0:f269e3021894 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
elessair 0:f269e3021894 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
elessair 0:f269e3021894 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
elessair 0:f269e3021894 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
elessair 0:f269e3021894 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
elessair 0:f269e3021894 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
elessair 0:f269e3021894 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
elessair 0:f269e3021894 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
elessair 0:f269e3021894 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
elessair 0:f269e3021894 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
elessair 0:f269e3021894 28 *******************************************************************************
elessair 0:f269e3021894 29 */
elessair 0:f269e3021894 30 #include "mbed_assert.h"
elessair 0:f269e3021894 31 #include "i2c_api.h"
elessair 0:f269e3021894 32
elessair 0:f269e3021894 33 #if DEVICE_I2C
elessair 0:f269e3021894 34
elessair 0:f269e3021894 35 #include "cmsis.h"
elessair 0:f269e3021894 36 #include "pinmap.h"
elessair 0:f269e3021894 37 #include "mbed_error.h"
elessair 0:f269e3021894 38 #include "PeripheralPins.h"
elessair 0:f269e3021894 39
elessair 0:f269e3021894 40 /* Timeout values for flags and events waiting loops. These timeouts are
elessair 0:f269e3021894 41 not based on accurate values, they just guarantee that the application will
elessair 0:f269e3021894 42 not remain stuck if the I2C communication is corrupted. */
elessair 0:f269e3021894 43 #define FLAG_TIMEOUT ((int)0x1000)
elessair 0:f269e3021894 44 #define LONG_TIMEOUT ((int)0x8000)
elessair 0:f269e3021894 45
elessair 0:f269e3021894 46 I2C_HandleTypeDef I2cHandle;
elessair 0:f269e3021894 47
elessair 0:f269e3021894 48 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
elessair 0:f269e3021894 49 {
elessair 0:f269e3021894 50 static int i2c1_inited = 0;
elessair 0:f269e3021894 51 #if defined(I2C2_BASE)
elessair 0:f269e3021894 52 static int i2c2_inited = 0;
elessair 0:f269e3021894 53 #endif
elessair 0:f269e3021894 54 #if defined(I2C3_BASE)
elessair 0:f269e3021894 55 static int i2c3_inited = 0;
elessair 0:f269e3021894 56 #endif
elessair 0:f269e3021894 57
elessair 0:f269e3021894 58 // Determine the I2C to use
elessair 0:f269e3021894 59 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 60 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 61
elessair 0:f269e3021894 62 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
elessair 0:f269e3021894 63 MBED_ASSERT(obj->i2c != (I2CName)NC);
elessair 0:f269e3021894 64
elessair 0:f269e3021894 65 // Enable I2C1 clock and pinout if not done
elessair 0:f269e3021894 66 if ((obj->i2c == I2C_1) && !i2c1_inited) {
elessair 0:f269e3021894 67 i2c1_inited = 1;
elessair 0:f269e3021894 68 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
elessair 0:f269e3021894 69 __I2C1_CLK_ENABLE();
elessair 0:f269e3021894 70 // Configure I2C pins
elessair 0:f269e3021894 71 pinmap_pinout(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 72 pinmap_pinout(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 73 pin_mode(sda, OpenDrain);
elessair 0:f269e3021894 74 pin_mode(scl, OpenDrain);
elessair 0:f269e3021894 75 }
elessair 0:f269e3021894 76
elessair 0:f269e3021894 77 #if defined(I2C2_BASE)
elessair 0:f269e3021894 78 // Enable I2C2 clock and pinout if not done
elessair 0:f269e3021894 79 if ((obj->i2c == I2C_2) && !i2c2_inited) {
elessair 0:f269e3021894 80 i2c2_inited = 1;
elessair 0:f269e3021894 81 __I2C2_CLK_ENABLE();
elessair 0:f269e3021894 82 // Configure I2C pins
elessair 0:f269e3021894 83 pinmap_pinout(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 84 pinmap_pinout(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 85 pin_mode(sda, OpenDrain);
elessair 0:f269e3021894 86 pin_mode(scl, OpenDrain);
elessair 0:f269e3021894 87 }
elessair 0:f269e3021894 88 #endif
elessair 0:f269e3021894 89
elessair 0:f269e3021894 90 #if defined(I2C3_BASE)
elessair 0:f269e3021894 91 // Enable I2C3 clock and pinout if not done
elessair 0:f269e3021894 92 if ((obj->i2c == I2C_3) && !i2c3_inited) {
elessair 0:f269e3021894 93 i2c3_inited = 1;
elessair 0:f269e3021894 94 __I2C3_CLK_ENABLE();
elessair 0:f269e3021894 95 // Configure I2C pins
elessair 0:f269e3021894 96 pinmap_pinout(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 97 pinmap_pinout(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 98 pin_mode(sda, OpenDrain);
elessair 0:f269e3021894 99 pin_mode(scl, OpenDrain);
elessair 0:f269e3021894 100 }
elessair 0:f269e3021894 101 #endif
elessair 0:f269e3021894 102
elessair 0:f269e3021894 103 // Reset to clear pending flags if any
elessair 0:f269e3021894 104 i2c_reset(obj);
elessair 0:f269e3021894 105
elessair 0:f269e3021894 106 // I2C configuration
elessair 0:f269e3021894 107 i2c_frequency(obj, 100000); // 100 kHz per default
elessair 0:f269e3021894 108 }
elessair 0:f269e3021894 109
elessair 0:f269e3021894 110 void i2c_frequency(i2c_t *obj, int hz)
elessair 0:f269e3021894 111 {
elessair 0:f269e3021894 112 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
elessair 0:f269e3021894 113 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 114 int timeout;
elessair 0:f269e3021894 115
elessair 0:f269e3021894 116 // wait before init
elessair 0:f269e3021894 117 timeout = LONG_TIMEOUT;
elessair 0:f269e3021894 118 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
elessair 0:f269e3021894 119
elessair 0:f269e3021894 120 // Common settings: I2C clock = 32 MHz, Analog filter = ON, Digital filter coefficient = 0
elessair 0:f269e3021894 121 switch (hz) {
elessair 0:f269e3021894 122 case 100000:
elessair 0:f269e3021894 123 I2cHandle.Init.Timing = 0x20602938; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
elessair 0:f269e3021894 124 break;
elessair 0:f269e3021894 125 case 400000:
elessair 0:f269e3021894 126 I2cHandle.Init.Timing = 0x00B0122A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
elessair 0:f269e3021894 127 break;
elessair 0:f269e3021894 128 case 1000000:
elessair 0:f269e3021894 129 I2cHandle.Init.Timing = 0x0030040E; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
elessair 0:f269e3021894 130 break;
elessair 0:f269e3021894 131 default:
elessair 0:f269e3021894 132 break;
elessair 0:f269e3021894 133 }
elessair 0:f269e3021894 134
elessair 0:f269e3021894 135 // I2C configuration
elessair 0:f269e3021894 136 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
elessair 0:f269e3021894 137 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
elessair 0:f269e3021894 138 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
elessair 0:f269e3021894 139 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
elessair 0:f269e3021894 140 I2cHandle.Init.OwnAddress1 = 0;
elessair 0:f269e3021894 141 I2cHandle.Init.OwnAddress2 = 0;
elessair 0:f269e3021894 142 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
elessair 0:f269e3021894 143
elessair 0:f269e3021894 144 if (HAL_I2C_Init(&I2cHandle) != HAL_OK) {
elessair 0:f269e3021894 145 error("Cannot initialize I2C");
elessair 0:f269e3021894 146 }
elessair 0:f269e3021894 147 }
elessair 0:f269e3021894 148
elessair 0:f269e3021894 149 inline int i2c_start(i2c_t *obj)
elessair 0:f269e3021894 150 {
elessair 0:f269e3021894 151 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 152 int timeout;
elessair 0:f269e3021894 153
elessair 0:f269e3021894 154 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 155
elessair 0:f269e3021894 156 // Clear Acknowledge failure flag
elessair 0:f269e3021894 157 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
elessair 0:f269e3021894 158
elessair 0:f269e3021894 159 // Wait the STOP condition has been previously correctly sent
elessair 0:f269e3021894 160 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 161 while ((i2c->CR2 & I2C_CR2_STOP) == I2C_CR2_STOP){
elessair 0:f269e3021894 162 if ((timeout--) == 0) {
elessair 0:f269e3021894 163 return 1;
elessair 0:f269e3021894 164 }
elessair 0:f269e3021894 165 }
elessair 0:f269e3021894 166
elessair 0:f269e3021894 167 // Generate the START condition
elessair 0:f269e3021894 168 i2c->CR2 |= I2C_CR2_START;
elessair 0:f269e3021894 169
elessair 0:f269e3021894 170 // Wait the START condition has been correctly sent
elessair 0:f269e3021894 171 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 172 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
elessair 0:f269e3021894 173 if ((timeout--) == 0) {
elessair 0:f269e3021894 174 return 1;
elessair 0:f269e3021894 175 }
elessair 0:f269e3021894 176 }
elessair 0:f269e3021894 177
elessair 0:f269e3021894 178 return 0;
elessair 0:f269e3021894 179 }
elessair 0:f269e3021894 180
elessair 0:f269e3021894 181 inline int i2c_stop(i2c_t *obj)
elessair 0:f269e3021894 182 {
elessair 0:f269e3021894 183 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 184
elessair 0:f269e3021894 185 // Generate the STOP condition
elessair 0:f269e3021894 186 i2c->CR2 |= I2C_CR2_STOP;
elessair 0:f269e3021894 187
elessair 0:f269e3021894 188 return 0;
elessair 0:f269e3021894 189 }
elessair 0:f269e3021894 190
elessair 0:f269e3021894 191 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
elessair 0:f269e3021894 192 {
elessair 0:f269e3021894 193 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 194 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 195 int timeout;
elessair 0:f269e3021894 196 int count;
elessair 0:f269e3021894 197 int value;
elessair 0:f269e3021894 198
elessair 0:f269e3021894 199 /* update CR2 register */
elessair 0:f269e3021894 200 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)))
elessair 0:f269e3021894 201 | (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);
elessair 0:f269e3021894 202
elessair 0:f269e3021894 203 // Read all bytes
elessair 0:f269e3021894 204 for (count = 0; count < length; count++) {
elessair 0:f269e3021894 205 value = i2c_byte_read(obj, 0);
elessair 0:f269e3021894 206 data[count] = (char)value;
elessair 0:f269e3021894 207 }
elessair 0:f269e3021894 208
elessair 0:f269e3021894 209 // Wait transfer complete
elessair 0:f269e3021894 210 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 211 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
elessair 0:f269e3021894 212 timeout--;
elessair 0:f269e3021894 213 if (timeout == 0) {
elessair 0:f269e3021894 214 return -1;
elessair 0:f269e3021894 215 }
elessair 0:f269e3021894 216 }
elessair 0:f269e3021894 217
elessair 0:f269e3021894 218 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
elessair 0:f269e3021894 219
elessair 0:f269e3021894 220 // If not repeated start, send stop.
elessair 0:f269e3021894 221 if (stop) {
elessair 0:f269e3021894 222 i2c_stop(obj);
elessair 0:f269e3021894 223 /* Wait until STOPF flag is set */
elessair 0:f269e3021894 224 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 225 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
elessair 0:f269e3021894 226 timeout--;
elessair 0:f269e3021894 227 if (timeout == 0) {
elessair 0:f269e3021894 228 return -1;
elessair 0:f269e3021894 229 }
elessair 0:f269e3021894 230 }
elessair 0:f269e3021894 231 /* Clear STOP Flag */
elessair 0:f269e3021894 232 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
elessair 0:f269e3021894 233 }
elessair 0:f269e3021894 234
elessair 0:f269e3021894 235 return length;
elessair 0:f269e3021894 236 }
elessair 0:f269e3021894 237
elessair 0:f269e3021894 238 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
elessair 0:f269e3021894 239 {
elessair 0:f269e3021894 240 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 241 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 242 int timeout;
elessair 0:f269e3021894 243 int count;
elessair 0:f269e3021894 244
elessair 0:f269e3021894 245 /* update CR2 register */
elessair 0:f269e3021894 246 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)))
elessair 0:f269e3021894 247 | (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);
elessair 0:f269e3021894 248
elessair 0:f269e3021894 249 for (count = 0; count < length; count++) {
elessair 0:f269e3021894 250 i2c_byte_write(obj, data[count]);
elessair 0:f269e3021894 251 }
elessair 0:f269e3021894 252
elessair 0:f269e3021894 253 // Wait transfer complete
elessair 0:f269e3021894 254 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 255 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
elessair 0:f269e3021894 256 timeout--;
elessair 0:f269e3021894 257 if (timeout == 0) {
elessair 0:f269e3021894 258 return -1;
elessair 0:f269e3021894 259 }
elessair 0:f269e3021894 260 }
elessair 0:f269e3021894 261
elessair 0:f269e3021894 262 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
elessair 0:f269e3021894 263
elessair 0:f269e3021894 264 // If not repeated start, send stop.
elessair 0:f269e3021894 265 if (stop) {
elessair 0:f269e3021894 266 i2c_stop(obj);
elessair 0:f269e3021894 267 /* Wait until STOPF flag is set */
elessair 0:f269e3021894 268 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 269 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
elessair 0:f269e3021894 270 timeout--;
elessair 0:f269e3021894 271 if (timeout == 0) {
elessair 0:f269e3021894 272 return -1;
elessair 0:f269e3021894 273 }
elessair 0:f269e3021894 274 }
elessair 0:f269e3021894 275 /* Clear STOP Flag */
elessair 0:f269e3021894 276 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
elessair 0:f269e3021894 277 }
elessair 0:f269e3021894 278
elessair 0:f269e3021894 279 return count;
elessair 0:f269e3021894 280 }
elessair 0:f269e3021894 281
elessair 0:f269e3021894 282 int i2c_byte_read(i2c_t *obj, int last)
elessair 0:f269e3021894 283 {
elessair 0:f269e3021894 284 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 285 int timeout;
elessair 0:f269e3021894 286
elessair 0:f269e3021894 287 // Wait until the byte is received
elessair 0:f269e3021894 288 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 289 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
elessair 0:f269e3021894 290 if ((timeout--) == 0) {
elessair 0:f269e3021894 291 return -1;
elessair 0:f269e3021894 292 }
elessair 0:f269e3021894 293 }
elessair 0:f269e3021894 294
elessair 0:f269e3021894 295 return (int)i2c->RXDR;
elessair 0:f269e3021894 296 }
elessair 0:f269e3021894 297
elessair 0:f269e3021894 298 int i2c_byte_write(i2c_t *obj, int data)
elessair 0:f269e3021894 299 {
elessair 0:f269e3021894 300 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 301 int timeout;
elessair 0:f269e3021894 302
elessair 0:f269e3021894 303 // Wait until the previous byte is transmitted
elessair 0:f269e3021894 304 timeout = FLAG_TIMEOUT;
elessair 0:f269e3021894 305 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
elessair 0:f269e3021894 306 if ((timeout--) == 0) {
elessair 0:f269e3021894 307 return 0;
elessair 0:f269e3021894 308 }
elessair 0:f269e3021894 309 }
elessair 0:f269e3021894 310
elessair 0:f269e3021894 311 i2c->TXDR = (uint8_t)data;
elessair 0:f269e3021894 312
elessair 0:f269e3021894 313 return 1;
elessair 0:f269e3021894 314 }
elessair 0:f269e3021894 315
elessair 0:f269e3021894 316 void i2c_reset(i2c_t *obj)
elessair 0:f269e3021894 317 {
elessair 0:f269e3021894 318 int timeout;
elessair 0:f269e3021894 319
elessair 0:f269e3021894 320 // wait before reset
elessair 0:f269e3021894 321 timeout = LONG_TIMEOUT;
elessair 0:f269e3021894 322 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
elessair 0:f269e3021894 323
elessair 0:f269e3021894 324 if (obj->i2c == I2C_1) {
elessair 0:f269e3021894 325 __I2C1_FORCE_RESET();
elessair 0:f269e3021894 326 __I2C1_RELEASE_RESET();
elessair 0:f269e3021894 327 }
elessair 0:f269e3021894 328 #if defined(I2C2_BASE)
elessair 0:f269e3021894 329 if (obj->i2c == I2C_2) {
elessair 0:f269e3021894 330 __I2C2_FORCE_RESET();
elessair 0:f269e3021894 331 __I2C2_RELEASE_RESET();
elessair 0:f269e3021894 332 }
elessair 0:f269e3021894 333 #endif
elessair 0:f269e3021894 334 }
elessair 0:f269e3021894 335
elessair 0:f269e3021894 336 #if DEVICE_I2CSLAVE
elessair 0:f269e3021894 337
elessair 0:f269e3021894 338 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
elessair 0:f269e3021894 339 {
elessair 0:f269e3021894 340 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 341 uint16_t tmpreg;
elessair 0:f269e3021894 342
elessair 0:f269e3021894 343 // disable
elessair 0:f269e3021894 344 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
elessair 0:f269e3021894 345 // Get the old register value
elessair 0:f269e3021894 346 tmpreg = i2c->OAR1;
elessair 0:f269e3021894 347 // Reset address bits
elessair 0:f269e3021894 348 tmpreg &= 0xFC00;
elessair 0:f269e3021894 349 // Set new address
elessair 0:f269e3021894 350 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
elessair 0:f269e3021894 351 // Store the new register value
elessair 0:f269e3021894 352 i2c->OAR1 = tmpreg;
elessair 0:f269e3021894 353 // enable
elessair 0:f269e3021894 354 i2c->OAR1 |= I2C_OAR1_OA1EN;
elessair 0:f269e3021894 355 }
elessair 0:f269e3021894 356
elessair 0:f269e3021894 357 void i2c_slave_mode(i2c_t *obj, int enable_slave)
elessair 0:f269e3021894 358 {
elessair 0:f269e3021894 359
elessair 0:f269e3021894 360 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 361 uint16_t tmpreg;
elessair 0:f269e3021894 362
elessair 0:f269e3021894 363 // Get the old register value
elessair 0:f269e3021894 364 tmpreg = i2c->OAR1;
elessair 0:f269e3021894 365
elessair 0:f269e3021894 366 // Enable / disable slave
elessair 0:f269e3021894 367 if (enable_slave == 1) {
elessair 0:f269e3021894 368 tmpreg |= I2C_OAR1_OA1EN;
elessair 0:f269e3021894 369 } else {
elessair 0:f269e3021894 370 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
elessair 0:f269e3021894 371 }
elessair 0:f269e3021894 372
elessair 0:f269e3021894 373 // Set new mode
elessair 0:f269e3021894 374 i2c->OAR1 = tmpreg;
elessair 0:f269e3021894 375
elessair 0:f269e3021894 376 }
elessair 0:f269e3021894 377
elessair 0:f269e3021894 378 // See I2CSlave.h
elessair 0:f269e3021894 379 #define NoData 0 // the slave has not been addressed
elessair 0:f269e3021894 380 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
elessair 0:f269e3021894 381 #define WriteGeneral 2 // the master is writing to all slave
elessair 0:f269e3021894 382 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
elessair 0:f269e3021894 383
elessair 0:f269e3021894 384 int i2c_slave_receive(i2c_t *obj)
elessair 0:f269e3021894 385 {
elessair 0:f269e3021894 386 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 387 int retValue = NoData;
elessair 0:f269e3021894 388
elessair 0:f269e3021894 389 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
elessair 0:f269e3021894 390 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
elessair 0:f269e3021894 391 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
elessair 0:f269e3021894 392 retValue = ReadAddressed;
elessair 0:f269e3021894 393 else
elessair 0:f269e3021894 394 retValue = WriteAddressed;
elessair 0:f269e3021894 395 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
elessair 0:f269e3021894 396 }
elessair 0:f269e3021894 397 }
elessair 0:f269e3021894 398
elessair 0:f269e3021894 399 return (retValue);
elessair 0:f269e3021894 400 }
elessair 0:f269e3021894 401
elessair 0:f269e3021894 402 int i2c_slave_read(i2c_t *obj, char *data, int length)
elessair 0:f269e3021894 403 {
elessair 0:f269e3021894 404 char size = 0;
elessair 0:f269e3021894 405
elessair 0:f269e3021894 406 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
elessair 0:f269e3021894 407
elessair 0:f269e3021894 408 return size;
elessair 0:f269e3021894 409 }
elessair 0:f269e3021894 410
elessair 0:f269e3021894 411 int i2c_slave_write(i2c_t *obj, const char *data, int length)
elessair 0:f269e3021894 412 {
elessair 0:f269e3021894 413 char size = 0;
elessair 0:f269e3021894 414 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
elessair 0:f269e3021894 415
elessair 0:f269e3021894 416 do {
elessair 0:f269e3021894 417 i2c_byte_write(obj, data[size]);
elessair 0:f269e3021894 418 size++;
elessair 0:f269e3021894 419 } while (size < length);
elessair 0:f269e3021894 420
elessair 0:f269e3021894 421 return size;
elessair 0:f269e3021894 422 }
elessair 0:f269e3021894 423
elessair 0:f269e3021894 424
elessair 0:f269e3021894 425 #endif // DEVICE_I2CSLAVE
elessair 0:f269e3021894 426
elessair 0:f269e3021894 427 #endif // DEVICE_I2C