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mbed library sources

Dependents:   Encrypted my_mbed lklk CyaSSL_DTLS_Cellular ... more

Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_STM/TARGET_STM32F0/i2c_api.c@469:fc4922e0c183, 2015-02-09 (annotated)

Committer:
mbed_official
Date:
Mon Feb 09 09:30:07 2015 +0000
Revision:
469:fc4922e0c183
Parent:
targets/hal/TARGET_STM/TARGET_NUCLEO_F091RC/i2c_api.c@414:4ec4c5b614b0
Child:
630:825f75ca301e
Synchronized with git revision 06e2b3c8802cb4f78e9958ba9923755bd458e8b7



Full URL: https://github.com/mbedmicro/mbed/commit/06e2b3c8802cb4f78e9958ba9923755bd458e8b7/

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 340:28d1f895c6fe 48 int i2c2_inited = 0;
mbed_official 340:28d1f895c6fe 49
mbed_official 340:28d1f895c6fe 50 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
mbed_official 340:28d1f895c6fe 51 {
mbed_official 340:28d1f895c6fe 52 // Determine the I2C to use
mbed_official 340:28d1f895c6fe 53 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 340:28d1f895c6fe 54 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 340:28d1f895c6fe 55
mbed_official 340:28d1f895c6fe 56 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 340:28d1f895c6fe 57 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 340:28d1f895c6fe 58
mbed_official 340:28d1f895c6fe 59 // Enable I2C1 clock and pinout if not done
mbed_official 340:28d1f895c6fe 60 if ((obj->i2c == I2C_1) && !i2c1_inited) {
mbed_official 340:28d1f895c6fe 61 i2c1_inited = 1;
mbed_official 340:28d1f895c6fe 62 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 340:28d1f895c6fe 63 __I2C1_CLK_ENABLE();
mbed_official 340:28d1f895c6fe 64 // Configure I2C pins
mbed_official 340:28d1f895c6fe 65 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 340:28d1f895c6fe 66 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 340:28d1f895c6fe 67 pin_mode(sda, OpenDrain);
mbed_official 340:28d1f895c6fe 68 pin_mode(scl, OpenDrain);
mbed_official 340:28d1f895c6fe 69 }
mbed_official 340:28d1f895c6fe 70
mbed_official 340:28d1f895c6fe 71 // Enable I2C2 clock and pinout if not done
mbed_official 340:28d1f895c6fe 72 if ((obj->i2c == I2C_2) && !i2c2_inited) {
mbed_official 340:28d1f895c6fe 73 i2c2_inited = 1;
mbed_official 340:28d1f895c6fe 74 __I2C2_CLK_ENABLE();
mbed_official 340:28d1f895c6fe 75 // Configure I2C pins
mbed_official 340:28d1f895c6fe 76 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 340:28d1f895c6fe 77 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 340:28d1f895c6fe 78 pin_mode(sda, OpenDrain);
mbed_official 340:28d1f895c6fe 79 pin_mode(scl, OpenDrain);
mbed_official 340:28d1f895c6fe 80 }
mbed_official 340:28d1f895c6fe 81
mbed_official 340:28d1f895c6fe 82 // Reset to clear pending flags if any
mbed_official 340:28d1f895c6fe 83 i2c_reset(obj);
mbed_official 340:28d1f895c6fe 84
mbed_official 340:28d1f895c6fe 85 // I2C configuration
mbed_official 340:28d1f895c6fe 86 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 340:28d1f895c6fe 87 }
mbed_official 340:28d1f895c6fe 88
mbed_official 340:28d1f895c6fe 89 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 340:28d1f895c6fe 90 {
mbed_official 340:28d1f895c6fe 91 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 340:28d1f895c6fe 92 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 93 int timeout;
mbed_official 340:28d1f895c6fe 94
mbed_official 340:28d1f895c6fe 95 // wait before init
mbed_official 340:28d1f895c6fe 96 timeout = LONG_TIMEOUT;
mbed_official 340:28d1f895c6fe 97 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 340:28d1f895c6fe 98
mbed_official 340:28d1f895c6fe 99 // Common settings: I2C clock = 48 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 340:28d1f895c6fe 100 switch (hz) {
mbed_official 340:28d1f895c6fe 101 case 100000:
mbed_official 340:28d1f895c6fe 102 I2cHandle.Init.Timing = 0x10805E89; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 340:28d1f895c6fe 103 break;
mbed_official 340:28d1f895c6fe 104 case 400000:
mbed_official 340:28d1f895c6fe 105 I2cHandle.Init.Timing = 0x00901850; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 340:28d1f895c6fe 106 break;
mbed_official 340:28d1f895c6fe 107 case 1000000:
mbed_official 340:28d1f895c6fe 108 I2cHandle.Init.Timing = 0x00700818; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 340:28d1f895c6fe 109 break;
mbed_official 340:28d1f895c6fe 110 default:
mbed_official 340:28d1f895c6fe 111 break;
mbed_official 340:28d1f895c6fe 112 }
mbed_official 340:28d1f895c6fe 113
mbed_official 340:28d1f895c6fe 114 // I2C configuration
mbed_official 340:28d1f895c6fe 115 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 340:28d1f895c6fe 116 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 340:28d1f895c6fe 117 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 340:28d1f895c6fe 118 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 340:28d1f895c6fe 119 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 340:28d1f895c6fe 120 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 340:28d1f895c6fe 121 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 340:28d1f895c6fe 122 HAL_I2C_Init(&I2cHandle);
mbed_official 340:28d1f895c6fe 123 }
mbed_official 340:28d1f895c6fe 124
mbed_official 340:28d1f895c6fe 125 inline int i2c_start(i2c_t *obj)
mbed_official 340:28d1f895c6fe 126 {
mbed_official 340:28d1f895c6fe 127 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 128 int timeout;
mbed_official 340:28d1f895c6fe 129
mbed_official 340:28d1f895c6fe 130 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 131
mbed_official 340:28d1f895c6fe 132 // Clear Acknowledge failure flag
mbed_official 340:28d1f895c6fe 133 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 340:28d1f895c6fe 134
mbed_official 340:28d1f895c6fe 135 // Generate the START condition
mbed_official 340:28d1f895c6fe 136 i2c->CR2 |= I2C_CR2_START;
mbed_official 340:28d1f895c6fe 137
mbed_official 340:28d1f895c6fe 138 // Wait the START condition has been correctly sent
mbed_official 340:28d1f895c6fe 139 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 140 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 340:28d1f895c6fe 141 if ((timeout--) == 0) {
mbed_official 340:28d1f895c6fe 142 return 1;
mbed_official 340:28d1f895c6fe 143 }
mbed_official 340:28d1f895c6fe 144 }
mbed_official 340:28d1f895c6fe 145
mbed_official 340:28d1f895c6fe 146 return 0;
mbed_official 340:28d1f895c6fe 147 }
mbed_official 340:28d1f895c6fe 148
mbed_official 340:28d1f895c6fe 149 inline int i2c_stop(i2c_t *obj)
mbed_official 340:28d1f895c6fe 150 {
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 340:28d1f895c6fe 159 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 340:28d1f895c6fe 160 {
mbed_official 340:28d1f895c6fe 161 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 162 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 163 int timeout;
mbed_official 340:28d1f895c6fe 164 int count;
mbed_official 340:28d1f895c6fe 165 int value;
mbed_official 340:28d1f895c6fe 166
mbed_official 340:28d1f895c6fe 167 // Update CR2 register
mbed_official 340:28d1f895c6fe 168 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 169 | (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 170
mbed_official 340:28d1f895c6fe 171 // Read all bytes
mbed_official 340:28d1f895c6fe 172 for (count = 0; count < length; count++) {
mbed_official 340:28d1f895c6fe 173 value = i2c_byte_read(obj, 0);
mbed_official 340:28d1f895c6fe 174 data[count] = (char)value;
mbed_official 340:28d1f895c6fe 175 }
mbed_official 340:28d1f895c6fe 176
mbed_official 340:28d1f895c6fe 177 // Wait transfer complete
mbed_official 340:28d1f895c6fe 178 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 179 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 340:28d1f895c6fe 180 timeout--;
mbed_official 340:28d1f895c6fe 181 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 182 return -1;
mbed_official 340:28d1f895c6fe 183 }
mbed_official 340:28d1f895c6fe 184 }
mbed_official 340:28d1f895c6fe 185 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 340:28d1f895c6fe 186
mbed_official 340:28d1f895c6fe 187 // If not repeated start, send stop.
mbed_official 340:28d1f895c6fe 188 if (stop) {
mbed_official 340:28d1f895c6fe 189 i2c_stop(obj);
mbed_official 340:28d1f895c6fe 190 // Wait until STOPF flag is set
mbed_official 340:28d1f895c6fe 191 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 192 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 340:28d1f895c6fe 193 timeout--;
mbed_official 340:28d1f895c6fe 194 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 195 return -1;
mbed_official 340:28d1f895c6fe 196 }
mbed_official 340:28d1f895c6fe 197 }
mbed_official 340:28d1f895c6fe 198 // Clear STOP Flag
mbed_official 340:28d1f895c6fe 199 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 340:28d1f895c6fe 200 }
mbed_official 340:28d1f895c6fe 201
mbed_official 340:28d1f895c6fe 202 return length;
mbed_official 340:28d1f895c6fe 203 }
mbed_official 340:28d1f895c6fe 204
mbed_official 340:28d1f895c6fe 205 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 340:28d1f895c6fe 206 {
mbed_official 340:28d1f895c6fe 207 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 208 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 209 int timeout;
mbed_official 340:28d1f895c6fe 210 int count;
mbed_official 340:28d1f895c6fe 211
mbed_official 340:28d1f895c6fe 212 // Update CR2 register
mbed_official 340:28d1f895c6fe 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 340:28d1f895c6fe 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 340:28d1f895c6fe 215
mbed_official 340:28d1f895c6fe 216 for (count = 0; count < length; count++) {
mbed_official 340:28d1f895c6fe 217 i2c_byte_write(obj, data[count]);
mbed_official 340:28d1f895c6fe 218 }
mbed_official 340:28d1f895c6fe 219
mbed_official 340:28d1f895c6fe 220 // Wait transfer complete
mbed_official 340:28d1f895c6fe 221 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 222 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 340:28d1f895c6fe 223 timeout--;
mbed_official 340:28d1f895c6fe 224 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 225 return -1;
mbed_official 340:28d1f895c6fe 226 }
mbed_official 340:28d1f895c6fe 227 }
mbed_official 340:28d1f895c6fe 228 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 340:28d1f895c6fe 229
mbed_official 340:28d1f895c6fe 230 // If not repeated start, send stop
mbed_official 340:28d1f895c6fe 231 if (stop) {
mbed_official 340:28d1f895c6fe 232 i2c_stop(obj);
mbed_official 340:28d1f895c6fe 233 // Wait until STOPF flag is set
mbed_official 340:28d1f895c6fe 234 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 235 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 340:28d1f895c6fe 236 timeout--;
mbed_official 340:28d1f895c6fe 237 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 238 return -1;
mbed_official 340:28d1f895c6fe 239 }
mbed_official 340:28d1f895c6fe 240 }
mbed_official 340:28d1f895c6fe 241 // Clear STOP Flag
mbed_official 340:28d1f895c6fe 242 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 340:28d1f895c6fe 243 }
mbed_official 340:28d1f895c6fe 244
mbed_official 340:28d1f895c6fe 245 return count;
mbed_official 340:28d1f895c6fe 246 }
mbed_official 340:28d1f895c6fe 247
mbed_official 340:28d1f895c6fe 248 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 340:28d1f895c6fe 249 {
mbed_official 340:28d1f895c6fe 250 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 251 int timeout;
mbed_official 340:28d1f895c6fe 252
mbed_official 340:28d1f895c6fe 253 // Wait until the byte is received
mbed_official 340:28d1f895c6fe 254 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 255 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 340:28d1f895c6fe 256 if ((timeout--) == 0) {
mbed_official 340:28d1f895c6fe 257 return -1;
mbed_official 340:28d1f895c6fe 258 }
mbed_official 340:28d1f895c6fe 259 }
mbed_official 340:28d1f895c6fe 260
mbed_official 340:28d1f895c6fe 261 return (int)i2c->RXDR;
mbed_official 340:28d1f895c6fe 262 }
mbed_official 340:28d1f895c6fe 263
mbed_official 340:28d1f895c6fe 264 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 340:28d1f895c6fe 265 {
mbed_official 340:28d1f895c6fe 266 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 267 int timeout;
mbed_official 340:28d1f895c6fe 268
mbed_official 340:28d1f895c6fe 269 // Wait until the previous byte is transmitted
mbed_official 340:28d1f895c6fe 270 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 271 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 340:28d1f895c6fe 272 if ((timeout--) == 0) {
mbed_official 340:28d1f895c6fe 273 return 0;
mbed_official 340:28d1f895c6fe 274 }
mbed_official 340:28d1f895c6fe 275 }
mbed_official 340:28d1f895c6fe 276
mbed_official 340:28d1f895c6fe 277 i2c->TXDR = (uint8_t)data;
mbed_official 340:28d1f895c6fe 278
mbed_official 340:28d1f895c6fe 279 return 1;
mbed_official 340:28d1f895c6fe 280 }
mbed_official 340:28d1f895c6fe 281
mbed_official 340:28d1f895c6fe 282 void i2c_reset(i2c_t *obj)
mbed_official 340:28d1f895c6fe 283 {
mbed_official 340:28d1f895c6fe 284 int timeout;
mbed_official 340:28d1f895c6fe 285
mbed_official 340:28d1f895c6fe 286 // Wait before reset
mbed_official 340:28d1f895c6fe 287 timeout = LONG_TIMEOUT;
mbed_official 340:28d1f895c6fe 288 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 340:28d1f895c6fe 289
mbed_official 340:28d1f895c6fe 290 if (obj->i2c == I2C_1) {
mbed_official 340:28d1f895c6fe 291 __I2C1_FORCE_RESET();
mbed_official 340:28d1f895c6fe 292 __I2C1_RELEASE_RESET();
mbed_official 340:28d1f895c6fe 293 }
mbed_official 340:28d1f895c6fe 294 if (obj->i2c == I2C_2) {
mbed_official 340:28d1f895c6fe 295 __I2C2_FORCE_RESET();
mbed_official 340:28d1f895c6fe 296 __I2C2_RELEASE_RESET();
mbed_official 340:28d1f895c6fe 297 }
mbed_official 340:28d1f895c6fe 298 }
mbed_official 340:28d1f895c6fe 299
mbed_official 340:28d1f895c6fe 300 #if DEVICE_I2CSLAVE
mbed_official 340:28d1f895c6fe 301
mbed_official 340:28d1f895c6fe 302 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 340:28d1f895c6fe 303 {
mbed_official 340:28d1f895c6fe 304 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 305 uint16_t tmpreg = 0;
mbed_official 340:28d1f895c6fe 306
mbed_official 340:28d1f895c6fe 307 // disable
mbed_official 340:28d1f895c6fe 308 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 340:28d1f895c6fe 309 // Get the old register value
mbed_official 340:28d1f895c6fe 310 tmpreg = i2c->OAR1;
mbed_official 340:28d1f895c6fe 311 // Reset address bits
mbed_official 340:28d1f895c6fe 312 tmpreg &= 0xFC00;
mbed_official 340:28d1f895c6fe 313 // Set new address
mbed_official 340:28d1f895c6fe 314 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 340:28d1f895c6fe 315 // Store the new register value
mbed_official 340:28d1f895c6fe 316 i2c->OAR1 = tmpreg;
mbed_official 340:28d1f895c6fe 317 // enable
mbed_official 340:28d1f895c6fe 318 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 340:28d1f895c6fe 319 }
mbed_official 340:28d1f895c6fe 320
mbed_official 340:28d1f895c6fe 321 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 340:28d1f895c6fe 322 {
mbed_official 340:28d1f895c6fe 323 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 324 uint16_t tmpreg;
mbed_official 340:28d1f895c6fe 325
mbed_official 340:28d1f895c6fe 326 // Get the old register value
mbed_official 340:28d1f895c6fe 327 tmpreg = i2c->OAR1;
mbed_official 340:28d1f895c6fe 328
mbed_official 340:28d1f895c6fe 329 // Enable / disable slave
mbed_official 340:28d1f895c6fe 330 if (enable_slave == 1) {
mbed_official 340:28d1f895c6fe 331 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 340:28d1f895c6fe 332 } else {
mbed_official 340:28d1f895c6fe 333 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 340:28d1f895c6fe 334 }
mbed_official 340:28d1f895c6fe 335
mbed_official 340:28d1f895c6fe 336 // Set new mode
mbed_official 340:28d1f895c6fe 337 i2c->OAR1 = tmpreg;
mbed_official 340:28d1f895c6fe 338 }
mbed_official 340:28d1f895c6fe 339
mbed_official 340:28d1f895c6fe 340 // See I2CSlave.h
mbed_official 340:28d1f895c6fe 341 #define NoData 0 // the slave has not been addressed
mbed_official 340:28d1f895c6fe 342 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 340:28d1f895c6fe 343 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 340:28d1f895c6fe 344 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 340:28d1f895c6fe 345
mbed_official 340:28d1f895c6fe 346 int i2c_slave_receive(i2c_t *obj)
mbed_official 340:28d1f895c6fe 347 {
mbed_official 340:28d1f895c6fe 348 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 349 int retValue = NoData;
mbed_official 340:28d1f895c6fe 350
mbed_official 340:28d1f895c6fe 351 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 340:28d1f895c6fe 352 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 340:28d1f895c6fe 353 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 340:28d1f895c6fe 354 retValue = ReadAddressed;
mbed_official 340:28d1f895c6fe 355 else
mbed_official 340:28d1f895c6fe 356 retValue = WriteAddressed;
mbed_official 340:28d1f895c6fe 357
mbed_official 340:28d1f895c6fe 358 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 340:28d1f895c6fe 359 }
mbed_official 340:28d1f895c6fe 360 }
mbed_official 340:28d1f895c6fe 361
mbed_official 340:28d1f895c6fe 362 return (retValue);
mbed_official 340:28d1f895c6fe 363 }
mbed_official 340:28d1f895c6fe 364
mbed_official 340:28d1f895c6fe 365 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 340:28d1f895c6fe 366 {
mbed_official 340:28d1f895c6fe 367 char size = 0;
mbed_official 340:28d1f895c6fe 368
mbed_official 340:28d1f895c6fe 369 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 340:28d1f895c6fe 370
mbed_official 340:28d1f895c6fe 371 return size;
mbed_official 340:28d1f895c6fe 372 }
mbed_official 340:28d1f895c6fe 373
mbed_official 340:28d1f895c6fe 374 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 340:28d1f895c6fe 375 {
mbed_official 340:28d1f895c6fe 376 char size = 0;
mbed_official 340:28d1f895c6fe 377 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 378
mbed_official 340:28d1f895c6fe 379 do {
mbed_official 340:28d1f895c6fe 380 i2c_byte_write(obj, data[size]);
mbed_official 340:28d1f895c6fe 381 size++;
mbed_official 340:28d1f895c6fe 382 } while (size < length);
mbed_official 340:28d1f895c6fe 383
mbed_official 340:28d1f895c6fe 384 return size;
mbed_official 340:28d1f895c6fe 385 }
mbed_official 340:28d1f895c6fe 386
mbed_official 340:28d1f895c6fe 387
mbed_official 340:28d1f895c6fe 388 #endif // DEVICE_I2CSLAVE
mbed_official 340:28d1f895c6fe 389
mbed_official 340:28d1f895c6fe 390 #endif // DEVICE_I2C