rik te winkel / mbed-dev

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Dependents:   Numitron_clock

Fork of mbed-dev by mbed official

targets/hal/TARGET_STM/TARGET_STM32L0/i2c_api.c@114:fe4fe5cfc3a3, 2016-04-26 (annotated)

Committer:
mbed_official
Date:
Tue Apr 26 17:15:11 2016 +0100
Revision:
114:fe4fe5cfc3a3
Parent:
34:bb6061527455
Child:
144:ef7eb2e8f9f7
Synchronized with git revision d25daf7fad8fea9180bfa5134105bc6439ed808a



Full URL: https://github.com/mbedmicro/mbed/commit/d25daf7fad8fea9180bfa5134105bc6439ed808a/



[NUCLEO_L031K6] Add target

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 *******************************************************************************
bogdanm 0:9b334a45a8ff 3 * Copyright (c) 2015, STMicroelectronics
bogdanm 0:9b334a45a8ff 4 * All rights reserved.
bogdanm 0:9b334a45a8ff 5 *
bogdanm 0:9b334a45a8ff 6 * Redistribution and use in source and binary forms, with or without
bogdanm 0:9b334a45a8ff 7 * modification, are permitted provided that the following conditions are met:
bogdanm 0:9b334a45a8ff 8 *
bogdanm 0:9b334a45a8ff 9 * 1. Redistributions of source code must retain the above copyright notice,
bogdanm 0:9b334a45a8ff 10 * this list of conditions and the following disclaimer.
bogdanm 0:9b334a45a8ff 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
bogdanm 0:9b334a45a8ff 12 * this list of conditions and the following disclaimer in the documentation
bogdanm 0:9b334a45a8ff 13 * and/or other materials provided with the distribution.
bogdanm 0:9b334a45a8ff 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
bogdanm 0:9b334a45a8ff 15 * may be used to endorse or promote products derived from this software
bogdanm 0:9b334a45a8ff 16 * without specific prior written permission.
bogdanm 0:9b334a45a8ff 17 *
bogdanm 0:9b334a45a8ff 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
bogdanm 0:9b334a45a8ff 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
bogdanm 0:9b334a45a8ff 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
bogdanm 0:9b334a45a8ff 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
bogdanm 0:9b334a45a8ff 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
bogdanm 0:9b334a45a8ff 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
bogdanm 0:9b334a45a8ff 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
bogdanm 0:9b334a45a8ff 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
bogdanm 0:9b334a45a8ff 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
bogdanm 0:9b334a45a8ff 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
bogdanm 0:9b334a45a8ff 28 *******************************************************************************
bogdanm 0:9b334a45a8ff 29 */
bogdanm 0:9b334a45a8ff 30 #include "mbed_assert.h"
bogdanm 0:9b334a45a8ff 31 #include "i2c_api.h"
bogdanm 0:9b334a45a8ff 32
bogdanm 0:9b334a45a8ff 33 #if DEVICE_I2C
bogdanm 0:9b334a45a8ff 34
bogdanm 0:9b334a45a8ff 35 #include "cmsis.h"
bogdanm 0:9b334a45a8ff 36 #include "pinmap.h"
bogdanm 0:9b334a45a8ff 37 #include "mbed_error.h"
bogdanm 0:9b334a45a8ff 38 #include "PeripheralPins.h"
bogdanm 0:9b334a45a8ff 39
bogdanm 0:9b334a45a8ff 40 /* Timeout values for flags and events waiting loops. These timeouts are
bogdanm 0:9b334a45a8ff 41 not based on accurate values, they just guarantee that the application will
bogdanm 0:9b334a45a8ff 42 not remain stuck if the I2C communication is corrupted. */
bogdanm 0:9b334a45a8ff 43 #define FLAG_TIMEOUT ((int)0x1000)
bogdanm 0:9b334a45a8ff 44 #define LONG_TIMEOUT ((int)0x8000)
bogdanm 0:9b334a45a8ff 45
bogdanm 0:9b334a45a8ff 46 I2C_HandleTypeDef I2cHandle;
bogdanm 0:9b334a45a8ff 47
bogdanm 0:9b334a45a8ff 48 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
bogdanm 0:9b334a45a8ff 49 {
bogdanm 0:9b334a45a8ff 50 static int i2c1_inited = 0;
mbed_official 114:fe4fe5cfc3a3 51 #if defined(I2C2_BASE)
bogdanm 0:9b334a45a8ff 52 static int i2c2_inited = 0;
mbed_official 114:fe4fe5cfc3a3 53 #endif
bogdanm 0:9b334a45a8ff 54 #if defined(I2C3_BASE)
bogdanm 0:9b334a45a8ff 55 static int i2c3_inited = 0;
bogdanm 0:9b334a45a8ff 56 #endif
bogdanm 0:9b334a45a8ff 57
bogdanm 0:9b334a45a8ff 58 // Determine the I2C to use
bogdanm 0:9b334a45a8ff 59 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 60 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 61
bogdanm 0:9b334a45a8ff 62 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
bogdanm 0:9b334a45a8ff 63 MBED_ASSERT(obj->i2c != (I2CName)NC);
bogdanm 0:9b334a45a8ff 64
bogdanm 0:9b334a45a8ff 65 // Enable I2C1 clock and pinout if not done
bogdanm 0:9b334a45a8ff 66 if ((obj->i2c == I2C_1) && !i2c1_inited) {
bogdanm 0:9b334a45a8ff 67 i2c1_inited = 1;
bogdanm 0:9b334a45a8ff 68 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
bogdanm 0:9b334a45a8ff 69 __I2C1_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 70 // Configure I2C pins
bogdanm 0:9b334a45a8ff 71 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 72 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 73 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 74 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 75 }
bogdanm 0:9b334a45a8ff 76
mbed_official 114:fe4fe5cfc3a3 77 #if defined(I2C2_BASE)
bogdanm 0:9b334a45a8ff 78 // Enable I2C2 clock and pinout if not done
bogdanm 0:9b334a45a8ff 79 if ((obj->i2c == I2C_2) && !i2c2_inited) {
bogdanm 0:9b334a45a8ff 80 i2c2_inited = 1;
bogdanm 0:9b334a45a8ff 81 __I2C2_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 82 // Configure I2C pins
bogdanm 0:9b334a45a8ff 83 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 84 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 85 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 86 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 87 }
mbed_official 114:fe4fe5cfc3a3 88 #endif
bogdanm 0:9b334a45a8ff 89
bogdanm 0:9b334a45a8ff 90 #if defined(I2C3_BASE)
bogdanm 0:9b334a45a8ff 91 // Enable I2C3 clock and pinout if not done
bogdanm 0:9b334a45a8ff 92 if ((obj->i2c == I2C_3) && !i2c3_inited) {
bogdanm 0:9b334a45a8ff 93 i2c3_inited = 1;
bogdanm 0:9b334a45a8ff 94 __I2C3_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 95 // Configure I2C pins
bogdanm 0:9b334a45a8ff 96 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 0:9b334a45a8ff 97 pinmap_pinout(scl, PinMap_I2C_SCL);
bogdanm 0:9b334a45a8ff 98 pin_mode(sda, OpenDrain);
bogdanm 0:9b334a45a8ff 99 pin_mode(scl, OpenDrain);
bogdanm 0:9b334a45a8ff 100 }
bogdanm 0:9b334a45a8ff 101 #endif
bogdanm 0:9b334a45a8ff 102
bogdanm 0:9b334a45a8ff 103 // Reset to clear pending flags if any
bogdanm 0:9b334a45a8ff 104 i2c_reset(obj);
bogdanm 0:9b334a45a8ff 105
bogdanm 0:9b334a45a8ff 106 // I2C configuration
bogdanm 0:9b334a45a8ff 107 i2c_frequency(obj, 100000); // 100 kHz per default
bogdanm 0:9b334a45a8ff 108 }
bogdanm 0:9b334a45a8ff 109
bogdanm 0:9b334a45a8ff 110 void i2c_frequency(i2c_t *obj, int hz)
bogdanm 0:9b334a45a8ff 111 {
bogdanm 0:9b334a45a8ff 112 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
bogdanm 0:9b334a45a8ff 113 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 114 int timeout;
bogdanm 0:9b334a45a8ff 115
bogdanm 0:9b334a45a8ff 116 // wait before init
bogdanm 0:9b334a45a8ff 117 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 118 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
bogdanm 0:9b334a45a8ff 119
bogdanm 0:9b334a45a8ff 120 // Common settings: I2C clock = 32 MHz, Analog filter = ON, Digital filter coefficient = 0
bogdanm 0:9b334a45a8ff 121 switch (hz) {
bogdanm 0:9b334a45a8ff 122 case 100000:
bogdanm 0:9b334a45a8ff 123 I2cHandle.Init.Timing = 0x20602938; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
bogdanm 0:9b334a45a8ff 124 break;
bogdanm 0:9b334a45a8ff 125 case 400000:
bogdanm 0:9b334a45a8ff 126 I2cHandle.Init.Timing = 0x00B0122A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
bogdanm 0:9b334a45a8ff 127 break;
bogdanm 0:9b334a45a8ff 128 case 1000000:
bogdanm 0:9b334a45a8ff 129 I2cHandle.Init.Timing = 0x0030040E; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
bogdanm 0:9b334a45a8ff 130 break;
bogdanm 0:9b334a45a8ff 131 default:
bogdanm 0:9b334a45a8ff 132 break;
bogdanm 0:9b334a45a8ff 133 }
bogdanm 0:9b334a45a8ff 134
bogdanm 0:9b334a45a8ff 135 // I2C configuration
bogdanm 0:9b334a45a8ff 136 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
bogdanm 0:9b334a45a8ff 137 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
bogdanm 0:9b334a45a8ff 138 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
bogdanm 0:9b334a45a8ff 139 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
bogdanm 0:9b334a45a8ff 140 I2cHandle.Init.OwnAddress1 = 0;
bogdanm 0:9b334a45a8ff 141 I2cHandle.Init.OwnAddress2 = 0;
bogdanm 0:9b334a45a8ff 142 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
bogdanm 0:9b334a45a8ff 143
bogdanm 0:9b334a45a8ff 144 if (HAL_I2C_Init(&I2cHandle) != HAL_OK) {
bogdanm 0:9b334a45a8ff 145 error("Cannot initialize I2C");
bogdanm 0:9b334a45a8ff 146 }
bogdanm 0:9b334a45a8ff 147 }
bogdanm 0:9b334a45a8ff 148
bogdanm 0:9b334a45a8ff 149 inline int i2c_start(i2c_t *obj)
bogdanm 0:9b334a45a8ff 150 {
bogdanm 0:9b334a45a8ff 151 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 152 int timeout;
bogdanm 0:9b334a45a8ff 153
bogdanm 0:9b334a45a8ff 154 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 155
bogdanm 0:9b334a45a8ff 156 // Clear Acknowledge failure flag
bogdanm 0:9b334a45a8ff 157 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
bogdanm 0:9b334a45a8ff 158
mbed_official 34:bb6061527455 159 // Wait the STOP condition has been previously correctly sent
mbed_official 34:bb6061527455 160 timeout = FLAG_TIMEOUT;
mbed_official 34:bb6061527455 161 while ((i2c->CR2 & I2C_CR2_STOP) == I2C_CR2_STOP){
mbed_official 34:bb6061527455 162 if ((timeout--) == 0) {
mbed_official 34:bb6061527455 163 return 1;
mbed_official 34:bb6061527455 164 }
mbed_official 34:bb6061527455 165 }
mbed_official 34:bb6061527455 166
bogdanm 0:9b334a45a8ff 167 // Generate the START condition
bogdanm 0:9b334a45a8ff 168 i2c->CR2 |= I2C_CR2_START;
bogdanm 0:9b334a45a8ff 169
bogdanm 0:9b334a45a8ff 170 // Wait the START condition has been correctly sent
bogdanm 0:9b334a45a8ff 171 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 172 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
bogdanm 0:9b334a45a8ff 173 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 174 return 1;
bogdanm 0:9b334a45a8ff 175 }
bogdanm 0:9b334a45a8ff 176 }
bogdanm 0:9b334a45a8ff 177
bogdanm 0:9b334a45a8ff 178 return 0;
bogdanm 0:9b334a45a8ff 179 }
bogdanm 0:9b334a45a8ff 180
bogdanm 0:9b334a45a8ff 181 inline int i2c_stop(i2c_t *obj)
bogdanm 0:9b334a45a8ff 182 {
bogdanm 0:9b334a45a8ff 183 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 184
bogdanm 0:9b334a45a8ff 185 // Generate the STOP condition
bogdanm 0:9b334a45a8ff 186 i2c->CR2 |= I2C_CR2_STOP;
bogdanm 0:9b334a45a8ff 187
bogdanm 0:9b334a45a8ff 188 return 0;
bogdanm 0:9b334a45a8ff 189 }
bogdanm 0:9b334a45a8ff 190
bogdanm 0:9b334a45a8ff 191 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
bogdanm 0:9b334a45a8ff 192 {
bogdanm 0:9b334a45a8ff 193 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 194 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 195 int timeout;
bogdanm 0:9b334a45a8ff 196 int count;
bogdanm 0:9b334a45a8ff 197 int value;
bogdanm 0:9b334a45a8ff 198
bogdanm 0:9b334a45a8ff 199 /* update CR2 register */
bogdanm 0:9b334a45a8ff 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)))
bogdanm 0:9b334a45a8ff 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);
bogdanm 0:9b334a45a8ff 202
bogdanm 0:9b334a45a8ff 203 // Read all bytes
bogdanm 0:9b334a45a8ff 204 for (count = 0; count < length; count++) {
bogdanm 0:9b334a45a8ff 205 value = i2c_byte_read(obj, 0);
bogdanm 0:9b334a45a8ff 206 data[count] = (char)value;
bogdanm 0:9b334a45a8ff 207 }
bogdanm 0:9b334a45a8ff 208
bogdanm 0:9b334a45a8ff 209 // Wait transfer complete
bogdanm 0:9b334a45a8ff 210 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 211 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
bogdanm 0:9b334a45a8ff 212 timeout--;
bogdanm 0:9b334a45a8ff 213 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 214 return -1;
bogdanm 0:9b334a45a8ff 215 }
bogdanm 0:9b334a45a8ff 216 }
bogdanm 0:9b334a45a8ff 217
bogdanm 0:9b334a45a8ff 218 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
bogdanm 0:9b334a45a8ff 219
bogdanm 0:9b334a45a8ff 220 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 221 if (stop) {
bogdanm 0:9b334a45a8ff 222 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 223 /* Wait until STOPF flag is set */
bogdanm 0:9b334a45a8ff 224 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 225 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
bogdanm 0:9b334a45a8ff 226 timeout--;
bogdanm 0:9b334a45a8ff 227 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 228 return -1;
bogdanm 0:9b334a45a8ff 229 }
bogdanm 0:9b334a45a8ff 230 }
bogdanm 0:9b334a45a8ff 231 /* Clear STOP Flag */
bogdanm 0:9b334a45a8ff 232 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
bogdanm 0:9b334a45a8ff 233 }
bogdanm 0:9b334a45a8ff 234
bogdanm 0:9b334a45a8ff 235 return length;
bogdanm 0:9b334a45a8ff 236 }
bogdanm 0:9b334a45a8ff 237
bogdanm 0:9b334a45a8ff 238 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
bogdanm 0:9b334a45a8ff 239 {
bogdanm 0:9b334a45a8ff 240 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 241 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 242 int timeout;
bogdanm 0:9b334a45a8ff 243 int count;
bogdanm 0:9b334a45a8ff 244
bogdanm 0:9b334a45a8ff 245 /* update CR2 register */
bogdanm 0:9b334a45a8ff 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)))
bogdanm 0:9b334a45a8ff 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);
bogdanm 0:9b334a45a8ff 248
bogdanm 0:9b334a45a8ff 249 for (count = 0; count < length; count++) {
bogdanm 0:9b334a45a8ff 250 i2c_byte_write(obj, data[count]);
bogdanm 0:9b334a45a8ff 251 }
bogdanm 0:9b334a45a8ff 252
bogdanm 0:9b334a45a8ff 253 // Wait transfer complete
bogdanm 0:9b334a45a8ff 254 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 255 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
bogdanm 0:9b334a45a8ff 256 timeout--;
bogdanm 0:9b334a45a8ff 257 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 258 return -1;
bogdanm 0:9b334a45a8ff 259 }
bogdanm 0:9b334a45a8ff 260 }
bogdanm 0:9b334a45a8ff 261
bogdanm 0:9b334a45a8ff 262 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
bogdanm 0:9b334a45a8ff 263
bogdanm 0:9b334a45a8ff 264 // If not repeated start, send stop.
bogdanm 0:9b334a45a8ff 265 if (stop) {
bogdanm 0:9b334a45a8ff 266 i2c_stop(obj);
bogdanm 0:9b334a45a8ff 267 /* Wait until STOPF flag is set */
bogdanm 0:9b334a45a8ff 268 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 269 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
bogdanm 0:9b334a45a8ff 270 timeout--;
bogdanm 0:9b334a45a8ff 271 if (timeout == 0) {
bogdanm 0:9b334a45a8ff 272 return -1;
bogdanm 0:9b334a45a8ff 273 }
bogdanm 0:9b334a45a8ff 274 }
bogdanm 0:9b334a45a8ff 275 /* Clear STOP Flag */
bogdanm 0:9b334a45a8ff 276 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
bogdanm 0:9b334a45a8ff 277 }
bogdanm 0:9b334a45a8ff 278
bogdanm 0:9b334a45a8ff 279 return count;
bogdanm 0:9b334a45a8ff 280 }
bogdanm 0:9b334a45a8ff 281
bogdanm 0:9b334a45a8ff 282 int i2c_byte_read(i2c_t *obj, int last)
bogdanm 0:9b334a45a8ff 283 {
bogdanm 0:9b334a45a8ff 284 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 285 int timeout;
bogdanm 0:9b334a45a8ff 286
bogdanm 0:9b334a45a8ff 287 // Wait until the byte is received
bogdanm 0:9b334a45a8ff 288 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 289 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
bogdanm 0:9b334a45a8ff 290 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 291 return -1;
bogdanm 0:9b334a45a8ff 292 }
bogdanm 0:9b334a45a8ff 293 }
bogdanm 0:9b334a45a8ff 294
bogdanm 0:9b334a45a8ff 295 return (int)i2c->RXDR;
bogdanm 0:9b334a45a8ff 296 }
bogdanm 0:9b334a45a8ff 297
bogdanm 0:9b334a45a8ff 298 int i2c_byte_write(i2c_t *obj, int data)
bogdanm 0:9b334a45a8ff 299 {
bogdanm 0:9b334a45a8ff 300 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 301 int timeout;
bogdanm 0:9b334a45a8ff 302
bogdanm 0:9b334a45a8ff 303 // Wait until the previous byte is transmitted
bogdanm 0:9b334a45a8ff 304 timeout = FLAG_TIMEOUT;
bogdanm 0:9b334a45a8ff 305 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
bogdanm 0:9b334a45a8ff 306 if ((timeout--) == 0) {
bogdanm 0:9b334a45a8ff 307 return 0;
bogdanm 0:9b334a45a8ff 308 }
bogdanm 0:9b334a45a8ff 309 }
bogdanm 0:9b334a45a8ff 310
bogdanm 0:9b334a45a8ff 311 i2c->TXDR = (uint8_t)data;
bogdanm 0:9b334a45a8ff 312
bogdanm 0:9b334a45a8ff 313 return 1;
bogdanm 0:9b334a45a8ff 314 }
bogdanm 0:9b334a45a8ff 315
bogdanm 0:9b334a45a8ff 316 void i2c_reset(i2c_t *obj)
bogdanm 0:9b334a45a8ff 317 {
bogdanm 0:9b334a45a8ff 318 int timeout;
bogdanm 0:9b334a45a8ff 319
bogdanm 0:9b334a45a8ff 320 // wait before reset
bogdanm 0:9b334a45a8ff 321 timeout = LONG_TIMEOUT;
bogdanm 0:9b334a45a8ff 322 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
bogdanm 0:9b334a45a8ff 323
bogdanm 0:9b334a45a8ff 324 if (obj->i2c == I2C_1) {
bogdanm 0:9b334a45a8ff 325 __I2C1_FORCE_RESET();
bogdanm 0:9b334a45a8ff 326 __I2C1_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 327 }
mbed_official 114:fe4fe5cfc3a3 328 #if defined(I2C2_BASE)
bogdanm 0:9b334a45a8ff 329 if (obj->i2c == I2C_2) {
bogdanm 0:9b334a45a8ff 330 __I2C2_FORCE_RESET();
bogdanm 0:9b334a45a8ff 331 __I2C2_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 332 }
mbed_official 114:fe4fe5cfc3a3 333 #endif
bogdanm 0:9b334a45a8ff 334 }
bogdanm 0:9b334a45a8ff 335
bogdanm 0:9b334a45a8ff 336 #if DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 337
bogdanm 0:9b334a45a8ff 338 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
bogdanm 0:9b334a45a8ff 339 {
bogdanm 0:9b334a45a8ff 340 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 341 uint16_t tmpreg;
bogdanm 0:9b334a45a8ff 342
bogdanm 0:9b334a45a8ff 343 // disable
bogdanm 0:9b334a45a8ff 344 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
bogdanm 0:9b334a45a8ff 345 // Get the old register value
bogdanm 0:9b334a45a8ff 346 tmpreg = i2c->OAR1;
bogdanm 0:9b334a45a8ff 347 // Reset address bits
bogdanm 0:9b334a45a8ff 348 tmpreg &= 0xFC00;
bogdanm 0:9b334a45a8ff 349 // Set new address
bogdanm 0:9b334a45a8ff 350 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
bogdanm 0:9b334a45a8ff 351 // Store the new register value
bogdanm 0:9b334a45a8ff 352 i2c->OAR1 = tmpreg;
bogdanm 0:9b334a45a8ff 353 // enable
bogdanm 0:9b334a45a8ff 354 i2c->OAR1 |= I2C_OAR1_OA1EN;
bogdanm 0:9b334a45a8ff 355 }
bogdanm 0:9b334a45a8ff 356
bogdanm 0:9b334a45a8ff 357 void i2c_slave_mode(i2c_t *obj, int enable_slave)
bogdanm 0:9b334a45a8ff 358 {
bogdanm 0:9b334a45a8ff 359
bogdanm 0:9b334a45a8ff 360 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 361 uint16_t tmpreg;
bogdanm 0:9b334a45a8ff 362
bogdanm 0:9b334a45a8ff 363 // Get the old register value
bogdanm 0:9b334a45a8ff 364 tmpreg = i2c->OAR1;
bogdanm 0:9b334a45a8ff 365
bogdanm 0:9b334a45a8ff 366 // Enable / disable slave
bogdanm 0:9b334a45a8ff 367 if (enable_slave == 1) {
bogdanm 0:9b334a45a8ff 368 tmpreg |= I2C_OAR1_OA1EN;
bogdanm 0:9b334a45a8ff 369 } else {
bogdanm 0:9b334a45a8ff 370 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
bogdanm 0:9b334a45a8ff 371 }
bogdanm 0:9b334a45a8ff 372
bogdanm 0:9b334a45a8ff 373 // Set new mode
bogdanm 0:9b334a45a8ff 374 i2c->OAR1 = tmpreg;
bogdanm 0:9b334a45a8ff 375
bogdanm 0:9b334a45a8ff 376 }
bogdanm 0:9b334a45a8ff 377
bogdanm 0:9b334a45a8ff 378 // See I2CSlave.h
bogdanm 0:9b334a45a8ff 379 #define NoData 0 // the slave has not been addressed
bogdanm 0:9b334a45a8ff 380 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
bogdanm 0:9b334a45a8ff 381 #define WriteGeneral 2 // the master is writing to all slave
bogdanm 0:9b334a45a8ff 382 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
bogdanm 0:9b334a45a8ff 383
bogdanm 0:9b334a45a8ff 384 int i2c_slave_receive(i2c_t *obj)
bogdanm 0:9b334a45a8ff 385 {
bogdanm 0:9b334a45a8ff 386 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 387 int retValue = NoData;
bogdanm 0:9b334a45a8ff 388
bogdanm 0:9b334a45a8ff 389 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
bogdanm 0:9b334a45a8ff 390 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
bogdanm 0:9b334a45a8ff 391 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
bogdanm 0:9b334a45a8ff 392 retValue = ReadAddressed;
bogdanm 0:9b334a45a8ff 393 else
bogdanm 0:9b334a45a8ff 394 retValue = WriteAddressed;
bogdanm 0:9b334a45a8ff 395 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
bogdanm 0:9b334a45a8ff 396 }
bogdanm 0:9b334a45a8ff 397 }
bogdanm 0:9b334a45a8ff 398
bogdanm 0:9b334a45a8ff 399 return (retValue);
bogdanm 0:9b334a45a8ff 400 }
bogdanm 0:9b334a45a8ff 401
bogdanm 0:9b334a45a8ff 402 int i2c_slave_read(i2c_t *obj, char *data, int length)
bogdanm 0:9b334a45a8ff 403 {
bogdanm 0:9b334a45a8ff 404 char size = 0;
bogdanm 0:9b334a45a8ff 405
bogdanm 0:9b334a45a8ff 406 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
bogdanm 0:9b334a45a8ff 407
bogdanm 0:9b334a45a8ff 408 return size;
bogdanm 0:9b334a45a8ff 409 }
bogdanm 0:9b334a45a8ff 410
bogdanm 0:9b334a45a8ff 411 int i2c_slave_write(i2c_t *obj, const char *data, int length)
bogdanm 0:9b334a45a8ff 412 {
bogdanm 0:9b334a45a8ff 413 char size = 0;
bogdanm 0:9b334a45a8ff 414 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
bogdanm 0:9b334a45a8ff 415
bogdanm 0:9b334a45a8ff 416 do {
bogdanm 0:9b334a45a8ff 417 i2c_byte_write(obj, data[size]);
bogdanm 0:9b334a45a8ff 418 size++;
bogdanm 0:9b334a45a8ff 419 } while (size < length);
bogdanm 0:9b334a45a8ff 420
bogdanm 0:9b334a45a8ff 421 return size;
bogdanm 0:9b334a45a8ff 422 }
bogdanm 0:9b334a45a8ff 423
bogdanm 0:9b334a45a8ff 424
bogdanm 0:9b334a45a8ff 425 #endif // DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 426
bogdanm 0:9b334a45a8ff 427 #endif // DEVICE_I2C