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targets/hal/TARGET_STM/TARGET_STM32F0/i2c_api.c@636:b0d178e9fa10, 2016-07-07 (annotated)

Committer:
lzbpli
Date:
Thu Jul 07 06:48:59 2016 +0000
Revision:
636:b0d178e9fa10
Parent:
630:825f75ca301e 
l053

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 340:28d1f895c6fe 1 /* mbed Microcontroller Library
mbed_official 340:28d1f895c6fe 2 *******************************************************************************
mbed_official 340:28d1f895c6fe 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 340:28d1f895c6fe 4 * All rights reserved.
mbed_official 340:28d1f895c6fe 5 *
mbed_official 340:28d1f895c6fe 6 * Redistribution and use in source and binary forms, with or without
mbed_official 340:28d1f895c6fe 7 * modification, are permitted provided that the following conditions are met:
mbed_official 340:28d1f895c6fe 8 *
mbed_official 340:28d1f895c6fe 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 340:28d1f895c6fe 10 * this list of conditions and the following disclaimer.
mbed_official 340:28d1f895c6fe 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 340:28d1f895c6fe 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 340:28d1f895c6fe 13 * and/or other materials provided with the distribution.
mbed_official 340:28d1f895c6fe 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 340:28d1f895c6fe 15 * may be used to endorse or promote products derived from this software
mbed_official 340:28d1f895c6fe 16 * without specific prior written permission.
mbed_official 340:28d1f895c6fe 17 *
mbed_official 340:28d1f895c6fe 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 340:28d1f895c6fe 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 340:28d1f895c6fe 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 340:28d1f895c6fe 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 340:28d1f895c6fe 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 340:28d1f895c6fe 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 340:28d1f895c6fe 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 340:28d1f895c6fe 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 340:28d1f895c6fe 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 340:28d1f895c6fe 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 340:28d1f895c6fe 28 *******************************************************************************
mbed_official 340:28d1f895c6fe 29 */
mbed_official 340:28d1f895c6fe 30 #include "mbed_assert.h"
mbed_official 340:28d1f895c6fe 31 #include "i2c_api.h"
mbed_official 340:28d1f895c6fe 32
mbed_official 340:28d1f895c6fe 33 #if DEVICE_I2C
mbed_official 340:28d1f895c6fe 34
mbed_official 340:28d1f895c6fe 35 #include "cmsis.h"
mbed_official 340:28d1f895c6fe 36 #include "pinmap.h"
mbed_official 414:4ec4c5b614b0 37 #include "PeripheralPins.h"
mbed_official 340:28d1f895c6fe 38
mbed_official 340:28d1f895c6fe 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 340:28d1f895c6fe 40 not based on accurate values, they just guarantee that the application will
mbed_official 340:28d1f895c6fe 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 340:28d1f895c6fe 42 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 340:28d1f895c6fe 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 340:28d1f895c6fe 44
mbed_official 340:28d1f895c6fe 45 I2C_HandleTypeDef I2cHandle;
mbed_official 340:28d1f895c6fe 46
mbed_official 340:28d1f895c6fe 47 int i2c1_inited = 0;
mbed_official 630:825f75ca301e 48 #if defined(I2C2_BASE)
mbed_official 340:28d1f895c6fe 49 int i2c2_inited = 0;
mbed_official 630:825f75ca301e 50 #endif
mbed_official 340:28d1f895c6fe 51
mbed_official 630:825f75ca301e 52 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 340:28d1f895c6fe 53 // Determine the I2C to use
mbed_official 340:28d1f895c6fe 54 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 340:28d1f895c6fe 55 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 340:28d1f895c6fe 56
mbed_official 340:28d1f895c6fe 57 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 340:28d1f895c6fe 58 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 340:28d1f895c6fe 59
mbed_official 340:28d1f895c6fe 60 // Enable I2C1 clock and pinout if not done
mbed_official 340:28d1f895c6fe 61 if ((obj->i2c == I2C_1) && !i2c1_inited) {
mbed_official 340:28d1f895c6fe 62 i2c1_inited = 1;
mbed_official 340:28d1f895c6fe 63 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 340:28d1f895c6fe 64 __I2C1_CLK_ENABLE();
mbed_official 340:28d1f895c6fe 65 // Configure I2C pins
mbed_official 340:28d1f895c6fe 66 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 340:28d1f895c6fe 67 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 340:28d1f895c6fe 68 pin_mode(sda, OpenDrain);
mbed_official 340:28d1f895c6fe 69 pin_mode(scl, OpenDrain);
mbed_official 340:28d1f895c6fe 70 }
mbed_official 340:28d1f895c6fe 71
mbed_official 630:825f75ca301e 72 #if defined(I2C2_BASE)
mbed_official 340:28d1f895c6fe 73 // Enable I2C2 clock and pinout if not done
mbed_official 340:28d1f895c6fe 74 if ((obj->i2c == I2C_2) && !i2c2_inited) {
mbed_official 340:28d1f895c6fe 75 i2c2_inited = 1;
mbed_official 340:28d1f895c6fe 76 __I2C2_CLK_ENABLE();
mbed_official 340:28d1f895c6fe 77 // Configure I2C pins
mbed_official 340:28d1f895c6fe 78 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 340:28d1f895c6fe 79 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 340:28d1f895c6fe 80 pin_mode(sda, OpenDrain);
mbed_official 340:28d1f895c6fe 81 pin_mode(scl, OpenDrain);
mbed_official 340:28d1f895c6fe 82 }
mbed_official 630:825f75ca301e 83 #endif
mbed_official 340:28d1f895c6fe 84
mbed_official 340:28d1f895c6fe 85 // Reset to clear pending flags if any
mbed_official 340:28d1f895c6fe 86 i2c_reset(obj);
mbed_official 340:28d1f895c6fe 87
mbed_official 340:28d1f895c6fe 88 // I2C configuration
mbed_official 340:28d1f895c6fe 89 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 340:28d1f895c6fe 90 }
mbed_official 340:28d1f895c6fe 91
mbed_official 630:825f75ca301e 92 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 340:28d1f895c6fe 93 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 340:28d1f895c6fe 94 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 95 int timeout;
mbed_official 340:28d1f895c6fe 96
mbed_official 340:28d1f895c6fe 97 // wait before init
mbed_official 340:28d1f895c6fe 98 timeout = LONG_TIMEOUT;
mbed_official 340:28d1f895c6fe 99 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 340:28d1f895c6fe 100
mbed_official 340:28d1f895c6fe 101 // Common settings: I2C clock = 48 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 340:28d1f895c6fe 102 switch (hz) {
mbed_official 340:28d1f895c6fe 103 case 100000:
mbed_official 340:28d1f895c6fe 104 I2cHandle.Init.Timing = 0x10805E89; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 340:28d1f895c6fe 105 break;
mbed_official 340:28d1f895c6fe 106 case 400000:
mbed_official 340:28d1f895c6fe 107 I2cHandle.Init.Timing = 0x00901850; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 340:28d1f895c6fe 108 break;
mbed_official 340:28d1f895c6fe 109 case 1000000:
mbed_official 340:28d1f895c6fe 110 I2cHandle.Init.Timing = 0x00700818; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 340:28d1f895c6fe 111 break;
mbed_official 340:28d1f895c6fe 112 default:
mbed_official 340:28d1f895c6fe 113 break;
mbed_official 340:28d1f895c6fe 114 }
mbed_official 340:28d1f895c6fe 115
mbed_official 340:28d1f895c6fe 116 // I2C configuration
mbed_official 340:28d1f895c6fe 117 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 340:28d1f895c6fe 118 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 340:28d1f895c6fe 119 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 340:28d1f895c6fe 120 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 340:28d1f895c6fe 121 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 340:28d1f895c6fe 122 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 340:28d1f895c6fe 123 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 340:28d1f895c6fe 124 HAL_I2C_Init(&I2cHandle);
mbed_official 340:28d1f895c6fe 125 }
mbed_official 340:28d1f895c6fe 126
mbed_official 630:825f75ca301e 127 inline int i2c_start(i2c_t *obj) {
mbed_official 340:28d1f895c6fe 128 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 129 int timeout;
mbed_official 340:28d1f895c6fe 130
mbed_official 340:28d1f895c6fe 131 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 132
mbed_official 340:28d1f895c6fe 133 // Clear Acknowledge failure flag
mbed_official 340:28d1f895c6fe 134 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 340:28d1f895c6fe 135
mbed_official 340:28d1f895c6fe 136 // Generate the START condition
mbed_official 340:28d1f895c6fe 137 i2c->CR2 |= I2C_CR2_START;
mbed_official 340:28d1f895c6fe 138
mbed_official 340:28d1f895c6fe 139 // Wait the START condition has been correctly sent
mbed_official 340:28d1f895c6fe 140 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 141 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 340:28d1f895c6fe 142 if ((timeout--) == 0) {
mbed_official 340:28d1f895c6fe 143 return 1;
mbed_official 340:28d1f895c6fe 144 }
mbed_official 340:28d1f895c6fe 145 }
mbed_official 340:28d1f895c6fe 146
mbed_official 340:28d1f895c6fe 147 return 0;
mbed_official 340:28d1f895c6fe 148 }
mbed_official 340:28d1f895c6fe 149
mbed_official 630:825f75ca301e 150 inline int i2c_stop(i2c_t *obj) {
mbed_official 340:28d1f895c6fe 151 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 152
mbed_official 340:28d1f895c6fe 153 // Generate the STOP condition
mbed_official 340:28d1f895c6fe 154 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 340:28d1f895c6fe 155
mbed_official 340:28d1f895c6fe 156 return 0;
mbed_official 340:28d1f895c6fe 157 }
mbed_official 340:28d1f895c6fe 158
mbed_official 630:825f75ca301e 159 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 340:28d1f895c6fe 160 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 161 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 162 int timeout;
mbed_official 340:28d1f895c6fe 163 int count;
mbed_official 340:28d1f895c6fe 164 int value;
mbed_official 340:28d1f895c6fe 165
mbed_official 340:28d1f895c6fe 166 // Update CR2 register
mbed_official 340:28d1f895c6fe 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 340:28d1f895c6fe 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 340:28d1f895c6fe 169
mbed_official 340:28d1f895c6fe 170 // Read all bytes
mbed_official 340:28d1f895c6fe 171 for (count = 0; count < length; count++) {
mbed_official 340:28d1f895c6fe 172 value = i2c_byte_read(obj, 0);
mbed_official 340:28d1f895c6fe 173 data[count] = (char)value;
mbed_official 340:28d1f895c6fe 174 }
mbed_official 340:28d1f895c6fe 175
mbed_official 340:28d1f895c6fe 176 // Wait transfer complete
mbed_official 340:28d1f895c6fe 177 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 178 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 340:28d1f895c6fe 179 timeout--;
mbed_official 340:28d1f895c6fe 180 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 181 return -1;
mbed_official 340:28d1f895c6fe 182 }
mbed_official 340:28d1f895c6fe 183 }
mbed_official 340:28d1f895c6fe 184 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 340:28d1f895c6fe 185
mbed_official 340:28d1f895c6fe 186 // If not repeated start, send stop.
mbed_official 340:28d1f895c6fe 187 if (stop) {
mbed_official 340:28d1f895c6fe 188 i2c_stop(obj);
mbed_official 340:28d1f895c6fe 189 // Wait until STOPF flag is set
mbed_official 340:28d1f895c6fe 190 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 191 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 340:28d1f895c6fe 192 timeout--;
mbed_official 340:28d1f895c6fe 193 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 194 return -1;
mbed_official 340:28d1f895c6fe 195 }
mbed_official 340:28d1f895c6fe 196 }
mbed_official 340:28d1f895c6fe 197 // Clear STOP Flag
mbed_official 340:28d1f895c6fe 198 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 340:28d1f895c6fe 199 }
mbed_official 340:28d1f895c6fe 200
mbed_official 340:28d1f895c6fe 201 return length;
mbed_official 340:28d1f895c6fe 202 }
mbed_official 340:28d1f895c6fe 203
mbed_official 630:825f75ca301e 204 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 340:28d1f895c6fe 205 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 206 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 207 int timeout;
mbed_official 340:28d1f895c6fe 208 int count;
mbed_official 340:28d1f895c6fe 209
mbed_official 340:28d1f895c6fe 210 // Update CR2 register
mbed_official 340:28d1f895c6fe 211 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 340:28d1f895c6fe 212 | (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 340:28d1f895c6fe 213
mbed_official 340:28d1f895c6fe 214 for (count = 0; count < length; count++) {
mbed_official 340:28d1f895c6fe 215 i2c_byte_write(obj, data[count]);
mbed_official 340:28d1f895c6fe 216 }
mbed_official 340:28d1f895c6fe 217
mbed_official 340:28d1f895c6fe 218 // Wait transfer complete
mbed_official 340:28d1f895c6fe 219 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 220 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 340:28d1f895c6fe 221 timeout--;
mbed_official 340:28d1f895c6fe 222 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 223 return -1;
mbed_official 340:28d1f895c6fe 224 }
mbed_official 340:28d1f895c6fe 225 }
mbed_official 340:28d1f895c6fe 226 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 340:28d1f895c6fe 227
mbed_official 340:28d1f895c6fe 228 // If not repeated start, send stop
mbed_official 340:28d1f895c6fe 229 if (stop) {
mbed_official 340:28d1f895c6fe 230 i2c_stop(obj);
mbed_official 340:28d1f895c6fe 231 // Wait until STOPF flag is set
mbed_official 340:28d1f895c6fe 232 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 233 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 340:28d1f895c6fe 234 timeout--;
mbed_official 340:28d1f895c6fe 235 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 236 return -1;
mbed_official 340:28d1f895c6fe 237 }
mbed_official 340:28d1f895c6fe 238 }
mbed_official 340:28d1f895c6fe 239 // Clear STOP Flag
mbed_official 340:28d1f895c6fe 240 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 340:28d1f895c6fe 241 }
mbed_official 340:28d1f895c6fe 242
mbed_official 340:28d1f895c6fe 243 return count;
mbed_official 340:28d1f895c6fe 244 }
mbed_official 340:28d1f895c6fe 245
mbed_official 630:825f75ca301e 246 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 340:28d1f895c6fe 247 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 248 int timeout;
mbed_official 340:28d1f895c6fe 249
mbed_official 340:28d1f895c6fe 250 // Wait until the byte is received
mbed_official 340:28d1f895c6fe 251 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 252 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 340:28d1f895c6fe 253 if ((timeout--) == 0) {
mbed_official 340:28d1f895c6fe 254 return -1;
mbed_official 340:28d1f895c6fe 255 }
mbed_official 340:28d1f895c6fe 256 }
mbed_official 340:28d1f895c6fe 257
mbed_official 340:28d1f895c6fe 258 return (int)i2c->RXDR;
mbed_official 340:28d1f895c6fe 259 }
mbed_official 340:28d1f895c6fe 260
mbed_official 630:825f75ca301e 261 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 340:28d1f895c6fe 262 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 263 int timeout;
mbed_official 340:28d1f895c6fe 264
mbed_official 340:28d1f895c6fe 265 // Wait until the previous byte is transmitted
mbed_official 340:28d1f895c6fe 266 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 267 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 340:28d1f895c6fe 268 if ((timeout--) == 0) {
mbed_official 340:28d1f895c6fe 269 return 0;
mbed_official 340:28d1f895c6fe 270 }
mbed_official 340:28d1f895c6fe 271 }
mbed_official 340:28d1f895c6fe 272
mbed_official 340:28d1f895c6fe 273 i2c->TXDR = (uint8_t)data;
mbed_official 340:28d1f895c6fe 274
mbed_official 340:28d1f895c6fe 275 return 1;
mbed_official 340:28d1f895c6fe 276 }
mbed_official 340:28d1f895c6fe 277
mbed_official 630:825f75ca301e 278 void i2c_reset(i2c_t *obj) {
mbed_official 340:28d1f895c6fe 279 int timeout;
mbed_official 340:28d1f895c6fe 280
mbed_official 340:28d1f895c6fe 281 // Wait before reset
mbed_official 340:28d1f895c6fe 282 timeout = LONG_TIMEOUT;
mbed_official 340:28d1f895c6fe 283 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 340:28d1f895c6fe 284
mbed_official 340:28d1f895c6fe 285 if (obj->i2c == I2C_1) {
mbed_official 340:28d1f895c6fe 286 __I2C1_FORCE_RESET();
mbed_official 340:28d1f895c6fe 287 __I2C1_RELEASE_RESET();
mbed_official 340:28d1f895c6fe 288 }
mbed_official 630:825f75ca301e 289 #if defined(I2C2_BASE)
mbed_official 340:28d1f895c6fe 290 if (obj->i2c == I2C_2) {
mbed_official 340:28d1f895c6fe 291 __I2C2_FORCE_RESET();
mbed_official 340:28d1f895c6fe 292 __I2C2_RELEASE_RESET();
mbed_official 340:28d1f895c6fe 293 }
mbed_official 630:825f75ca301e 294 #endif
mbed_official 340:28d1f895c6fe 295 }
mbed_official 340:28d1f895c6fe 296
mbed_official 340:28d1f895c6fe 297 #if DEVICE_I2CSLAVE
mbed_official 340:28d1f895c6fe 298
mbed_official 630:825f75ca301e 299 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 340:28d1f895c6fe 300 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 301 uint16_t tmpreg = 0;
mbed_official 340:28d1f895c6fe 302
mbed_official 340:28d1f895c6fe 303 // disable
mbed_official 340:28d1f895c6fe 304 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 340:28d1f895c6fe 305 // Get the old register value
mbed_official 340:28d1f895c6fe 306 tmpreg = i2c->OAR1;
mbed_official 340:28d1f895c6fe 307 // Reset address bits
mbed_official 340:28d1f895c6fe 308 tmpreg &= 0xFC00;
mbed_official 340:28d1f895c6fe 309 // Set new address
mbed_official 340:28d1f895c6fe 310 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 340:28d1f895c6fe 311 // Store the new register value
mbed_official 340:28d1f895c6fe 312 i2c->OAR1 = tmpreg;
mbed_official 340:28d1f895c6fe 313 // enable
mbed_official 340:28d1f895c6fe 314 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 340:28d1f895c6fe 315 }
mbed_official 340:28d1f895c6fe 316
mbed_official 630:825f75ca301e 317 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 340:28d1f895c6fe 318 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 319 uint16_t tmpreg;
mbed_official 340:28d1f895c6fe 320
mbed_official 340:28d1f895c6fe 321 // Get the old register value
mbed_official 340:28d1f895c6fe 322 tmpreg = i2c->OAR1;
mbed_official 340:28d1f895c6fe 323
mbed_official 340:28d1f895c6fe 324 // Enable / disable slave
mbed_official 340:28d1f895c6fe 325 if (enable_slave == 1) {
mbed_official 340:28d1f895c6fe 326 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 340:28d1f895c6fe 327 } else {
mbed_official 340:28d1f895c6fe 328 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 340:28d1f895c6fe 329 }
mbed_official 340:28d1f895c6fe 330
mbed_official 340:28d1f895c6fe 331 // Set new mode
mbed_official 340:28d1f895c6fe 332 i2c->OAR1 = tmpreg;
mbed_official 340:28d1f895c6fe 333 }
mbed_official 340:28d1f895c6fe 334
mbed_official 340:28d1f895c6fe 335 // See I2CSlave.h
mbed_official 340:28d1f895c6fe 336 #define NoData 0 // the slave has not been addressed
mbed_official 340:28d1f895c6fe 337 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 340:28d1f895c6fe 338 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 340:28d1f895c6fe 339 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 340:28d1f895c6fe 340
mbed_official 630:825f75ca301e 341 int i2c_slave_receive(i2c_t *obj) {
mbed_official 340:28d1f895c6fe 342 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 343 int retValue = NoData;
mbed_official 340:28d1f895c6fe 344
mbed_official 340:28d1f895c6fe 345 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 340:28d1f895c6fe 346 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 340:28d1f895c6fe 347 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 340:28d1f895c6fe 348 retValue = ReadAddressed;
mbed_official 340:28d1f895c6fe 349 else
mbed_official 340:28d1f895c6fe 350 retValue = WriteAddressed;
mbed_official 340:28d1f895c6fe 351
mbed_official 340:28d1f895c6fe 352 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 340:28d1f895c6fe 353 }
mbed_official 340:28d1f895c6fe 354 }
mbed_official 340:28d1f895c6fe 355
mbed_official 340:28d1f895c6fe 356 return (retValue);
mbed_official 340:28d1f895c6fe 357 }
mbed_official 340:28d1f895c6fe 358
mbed_official 630:825f75ca301e 359 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 340:28d1f895c6fe 360 char size = 0;
mbed_official 340:28d1f895c6fe 361
mbed_official 340:28d1f895c6fe 362 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 340:28d1f895c6fe 363
mbed_official 340:28d1f895c6fe 364 return size;
mbed_official 340:28d1f895c6fe 365 }
mbed_official 340:28d1f895c6fe 366
mbed_official 630:825f75ca301e 367 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 340:28d1f895c6fe 368 char size = 0;
mbed_official 340:28d1f895c6fe 369 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 370
mbed_official 340:28d1f895c6fe 371 do {
mbed_official 340:28d1f895c6fe 372 i2c_byte_write(obj, data[size]);
mbed_official 340:28d1f895c6fe 373 size++;
mbed_official 340:28d1f895c6fe 374 } while (size < length);
mbed_official 340:28d1f895c6fe 375
mbed_official 340:28d1f895c6fe 376 return size;
mbed_official 340:28d1f895c6fe 377 }
mbed_official 340:28d1f895c6fe 378
mbed_official 340:28d1f895c6fe 379
mbed_official 340:28d1f895c6fe 380 #endif // DEVICE_I2CSLAVE
mbed_official 340:28d1f895c6fe 381
mbed_official 340:28d1f895c6fe 382 #endif // DEVICE_I2C