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mbed library sources

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_NUCLEO_F072RB/i2c_api.c@247:135e3186a638, 2014-07-01 (annotated)

Committer:
mbed_official
Date:
Tue Jul 01 15:00:09 2014 +0100
Revision:
247:135e3186a638
Parent:
239:8cadf13dff33
Child:
305:1f0269907d8b
Synchronized with git revision 4f86d397190b9d18f22b4a189573d65b970f3662



Full URL: https://github.com/mbedmicro/mbed/commit/4f86d397190b9d18f22b4a189573d65b970f3662/



[NUCLEOs] enhance I2C API to make it work with EEPROM

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 219:993c9b0acbcc 1 /* mbed Microcontroller Library
mbed_official 219:993c9b0acbcc 2 *******************************************************************************
mbed_official 219:993c9b0acbcc 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 219:993c9b0acbcc 4 * All rights reserved.
mbed_official 219:993c9b0acbcc 5 *
mbed_official 219:993c9b0acbcc 6 * Redistribution and use in source and binary forms, with or without
mbed_official 219:993c9b0acbcc 7 * modification, are permitted provided that the following conditions are met:
mbed_official 219:993c9b0acbcc 8 *
mbed_official 219:993c9b0acbcc 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 219:993c9b0acbcc 10 * this list of conditions and the following disclaimer.
mbed_official 219:993c9b0acbcc 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 219:993c9b0acbcc 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 219:993c9b0acbcc 13 * and/or other materials provided with the distribution.
mbed_official 219:993c9b0acbcc 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 219:993c9b0acbcc 15 * may be used to endorse or promote products derived from this software
mbed_official 219:993c9b0acbcc 16 * without specific prior written permission.
mbed_official 219:993c9b0acbcc 17 *
mbed_official 219:993c9b0acbcc 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 219:993c9b0acbcc 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 219:993c9b0acbcc 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 219:993c9b0acbcc 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 219:993c9b0acbcc 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 219:993c9b0acbcc 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 219:993c9b0acbcc 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 219:993c9b0acbcc 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 219:993c9b0acbcc 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 219:993c9b0acbcc 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 219:993c9b0acbcc 28 *******************************************************************************
mbed_official 219:993c9b0acbcc 29 */
mbed_official 239:8cadf13dff33 30 #include "mbed_assert.h"
mbed_official 219:993c9b0acbcc 31 #include "i2c_api.h"
mbed_official 219:993c9b0acbcc 32
mbed_official 219:993c9b0acbcc 33 #if DEVICE_I2C
mbed_official 219:993c9b0acbcc 34
mbed_official 219:993c9b0acbcc 35 #include "cmsis.h"
mbed_official 219:993c9b0acbcc 36 #include "pinmap.h"
mbed_official 219:993c9b0acbcc 37
mbed_official 219:993c9b0acbcc 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 219:993c9b0acbcc 39 not based on accurate values, they just guarantee that the application will
mbed_official 219:993c9b0acbcc 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 219:993c9b0acbcc 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 219:993c9b0acbcc 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 219:993c9b0acbcc 43
mbed_official 219:993c9b0acbcc 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 219:993c9b0acbcc 45 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 219:993c9b0acbcc 46 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 219:993c9b0acbcc 47 {PB_11, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C2)},
mbed_official 219:993c9b0acbcc 48 {PB_14, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 219:993c9b0acbcc 49 {NC, NC, 0}
mbed_official 219:993c9b0acbcc 50 };
mbed_official 219:993c9b0acbcc 51
mbed_official 219:993c9b0acbcc 52 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 219:993c9b0acbcc 53 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 219:993c9b0acbcc 54 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 219:993c9b0acbcc 55 {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C2)},
mbed_official 219:993c9b0acbcc 56 {PB_13, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 219:993c9b0acbcc 57 {NC, NC, 0}
mbed_official 219:993c9b0acbcc 58 };
mbed_official 219:993c9b0acbcc 59
mbed_official 219:993c9b0acbcc 60 I2C_HandleTypeDef I2cHandle;
mbed_official 219:993c9b0acbcc 61
mbed_official 219:993c9b0acbcc 62 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 219:993c9b0acbcc 63 // Determine the I2C to use
mbed_official 219:993c9b0acbcc 64 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 219:993c9b0acbcc 65 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 219:993c9b0acbcc 66
mbed_official 219:993c9b0acbcc 67 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 239:8cadf13dff33 68 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 219:993c9b0acbcc 69
mbed_official 219:993c9b0acbcc 70 // Enable I2C clock
mbed_official 219:993c9b0acbcc 71 if (obj->i2c == I2C_1) {
mbed_official 219:993c9b0acbcc 72 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 219:993c9b0acbcc 73 __I2C1_CLK_ENABLE();
mbed_official 219:993c9b0acbcc 74 }
mbed_official 219:993c9b0acbcc 75 if (obj->i2c == I2C_2) {
mbed_official 219:993c9b0acbcc 76 __I2C2_CLK_ENABLE();
mbed_official 219:993c9b0acbcc 77 }
mbed_official 219:993c9b0acbcc 78
mbed_official 219:993c9b0acbcc 79 // Configure I2C pins
mbed_official 219:993c9b0acbcc 80 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 219:993c9b0acbcc 81 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 219:993c9b0acbcc 82 pin_mode(sda, OpenDrain);
mbed_official 219:993c9b0acbcc 83 pin_mode(scl, OpenDrain);
mbed_official 219:993c9b0acbcc 84
mbed_official 219:993c9b0acbcc 85 // Reset to clear pending flags if any
mbed_official 219:993c9b0acbcc 86 i2c_reset(obj);
mbed_official 219:993c9b0acbcc 87
mbed_official 219:993c9b0acbcc 88 // I2C configuration
mbed_official 219:993c9b0acbcc 89 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 219:993c9b0acbcc 90 }
mbed_official 219:993c9b0acbcc 91
mbed_official 219:993c9b0acbcc 92 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 239:8cadf13dff33 93 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 239:8cadf13dff33 94
mbed_official 219:993c9b0acbcc 95 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 96
mbed_official 219:993c9b0acbcc 97 // Common settings: I2C clock = 48 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 219:993c9b0acbcc 98 switch (hz) {
mbed_official 219:993c9b0acbcc 99 case 100000:
mbed_official 219:993c9b0acbcc 100 I2cHandle.Init.Timing = 0x10805E89; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 219:993c9b0acbcc 101 break;
mbed_official 219:993c9b0acbcc 102 case 400000:
mbed_official 219:993c9b0acbcc 103 I2cHandle.Init.Timing = 0x00901850; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 219:993c9b0acbcc 104 break;
mbed_official 219:993c9b0acbcc 105 case 1000000:
mbed_official 219:993c9b0acbcc 106 I2cHandle.Init.Timing = 0x00700818; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 219:993c9b0acbcc 107 break;
mbed_official 219:993c9b0acbcc 108 default:
mbed_official 219:993c9b0acbcc 109 break;
mbed_official 219:993c9b0acbcc 110 }
mbed_official 219:993c9b0acbcc 111
mbed_official 219:993c9b0acbcc 112 // I2C configuration
mbed_official 219:993c9b0acbcc 113 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 219:993c9b0acbcc 114 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 219:993c9b0acbcc 115 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 219:993c9b0acbcc 116 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 219:993c9b0acbcc 117 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 219:993c9b0acbcc 118 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 219:993c9b0acbcc 119 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 219:993c9b0acbcc 120 HAL_I2C_Init(&I2cHandle);
mbed_official 219:993c9b0acbcc 121 }
mbed_official 219:993c9b0acbcc 122
mbed_official 219:993c9b0acbcc 123 inline int i2c_start(i2c_t *obj) {
mbed_official 219:993c9b0acbcc 124 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 125 int timeout;
mbed_official 219:993c9b0acbcc 126
mbed_official 219:993c9b0acbcc 127 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 128
mbed_official 219:993c9b0acbcc 129 // Clear Acknowledge failure flag
mbed_official 219:993c9b0acbcc 130 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 219:993c9b0acbcc 131
mbed_official 219:993c9b0acbcc 132 // Generate the START condition
mbed_official 219:993c9b0acbcc 133 i2c->CR2 |= I2C_CR2_START;
mbed_official 219:993c9b0acbcc 134
mbed_official 219:993c9b0acbcc 135 // Wait the START condition has been correctly sent
mbed_official 219:993c9b0acbcc 136 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 137 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 219:993c9b0acbcc 138 if ((timeout--) == 0) {
mbed_official 219:993c9b0acbcc 139 return 1;
mbed_official 219:993c9b0acbcc 140 }
mbed_official 219:993c9b0acbcc 141 }
mbed_official 219:993c9b0acbcc 142
mbed_official 219:993c9b0acbcc 143 return 0;
mbed_official 219:993c9b0acbcc 144 }
mbed_official 219:993c9b0acbcc 145
mbed_official 219:993c9b0acbcc 146 inline int i2c_stop(i2c_t *obj) {
mbed_official 219:993c9b0acbcc 147 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 148
mbed_official 219:993c9b0acbcc 149 // Generate the STOP condition
mbed_official 219:993c9b0acbcc 150 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 219:993c9b0acbcc 151
mbed_official 219:993c9b0acbcc 152 return 0;
mbed_official 219:993c9b0acbcc 153 }
mbed_official 219:993c9b0acbcc 154
mbed_official 219:993c9b0acbcc 155 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 219:993c9b0acbcc 156 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 157 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 158 int timeout;
mbed_official 219:993c9b0acbcc 159 int count;
mbed_official 219:993c9b0acbcc 160 int value;
mbed_official 219:993c9b0acbcc 161
mbed_official 219:993c9b0acbcc 162 /* update CR2 register */
mbed_official 219:993c9b0acbcc 163 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 219:993c9b0acbcc 164 | (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 219:993c9b0acbcc 165
mbed_official 219:993c9b0acbcc 166 // Read all bytes
mbed_official 219:993c9b0acbcc 167 for (count = 0; count < length; count++) {
mbed_official 219:993c9b0acbcc 168 value = i2c_byte_read(obj, 0);
mbed_official 219:993c9b0acbcc 169 data[count] = (char)value;
mbed_official 219:993c9b0acbcc 170 }
mbed_official 219:993c9b0acbcc 171
mbed_official 219:993c9b0acbcc 172 // Wait transfer complete
mbed_official 219:993c9b0acbcc 173 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 174 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 219:993c9b0acbcc 175 timeout--;
mbed_official 219:993c9b0acbcc 176 if (timeout == 0) {
mbed_official 247:135e3186a638 177 return -1;
mbed_official 219:993c9b0acbcc 178 }
mbed_official 219:993c9b0acbcc 179 }
mbed_official 219:993c9b0acbcc 180 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 219:993c9b0acbcc 181
mbed_official 219:993c9b0acbcc 182 // If not repeated start, send stop.
mbed_official 219:993c9b0acbcc 183 if (stop) {
mbed_official 219:993c9b0acbcc 184 i2c_stop(obj);
mbed_official 219:993c9b0acbcc 185 /* Wait until STOPF flag is set */
mbed_official 219:993c9b0acbcc 186 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 187 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 219:993c9b0acbcc 188 timeout--;
mbed_official 219:993c9b0acbcc 189 if (timeout == 0) {
mbed_official 247:135e3186a638 190 return -1;
mbed_official 219:993c9b0acbcc 191 }
mbed_official 219:993c9b0acbcc 192 }
mbed_official 219:993c9b0acbcc 193 /* Clear STOP Flag */
mbed_official 219:993c9b0acbcc 194 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 219:993c9b0acbcc 195 }
mbed_official 219:993c9b0acbcc 196
mbed_official 219:993c9b0acbcc 197 return length;
mbed_official 219:993c9b0acbcc 198 }
mbed_official 219:993c9b0acbcc 199
mbed_official 219:993c9b0acbcc 200 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 219:993c9b0acbcc 201 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 202 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 203 int timeout;
mbed_official 219:993c9b0acbcc 204 int count;
mbed_official 219:993c9b0acbcc 205
mbed_official 219:993c9b0acbcc 206 /* update CR2 register */
mbed_official 219:993c9b0acbcc 207 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 219:993c9b0acbcc 208 | (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 219:993c9b0acbcc 209
mbed_official 219:993c9b0acbcc 210
mbed_official 219:993c9b0acbcc 211
mbed_official 219:993c9b0acbcc 212 for (count = 0; count < length; count++) {
mbed_official 219:993c9b0acbcc 213 i2c_byte_write(obj, data[count]);
mbed_official 219:993c9b0acbcc 214 }
mbed_official 219:993c9b0acbcc 215
mbed_official 219:993c9b0acbcc 216 // Wait transfer complete
mbed_official 219:993c9b0acbcc 217 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 218 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 219:993c9b0acbcc 219 timeout--;
mbed_official 219:993c9b0acbcc 220 if (timeout == 0) {
mbed_official 247:135e3186a638 221 return -1;
mbed_official 219:993c9b0acbcc 222 }
mbed_official 219:993c9b0acbcc 223 }
mbed_official 219:993c9b0acbcc 224 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 219:993c9b0acbcc 225
mbed_official 219:993c9b0acbcc 226 // If not repeated start, send stop.
mbed_official 219:993c9b0acbcc 227 if (stop) {
mbed_official 219:993c9b0acbcc 228 i2c_stop(obj);
mbed_official 219:993c9b0acbcc 229 /* Wait until STOPF flag is set */
mbed_official 219:993c9b0acbcc 230 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 231 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 219:993c9b0acbcc 232 timeout--;
mbed_official 219:993c9b0acbcc 233 if (timeout == 0) {
mbed_official 247:135e3186a638 234 return -1;
mbed_official 219:993c9b0acbcc 235 }
mbed_official 219:993c9b0acbcc 236 }
mbed_official 219:993c9b0acbcc 237 /* Clear STOP Flag */
mbed_official 219:993c9b0acbcc 238 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 219:993c9b0acbcc 239 }
mbed_official 219:993c9b0acbcc 240
mbed_official 219:993c9b0acbcc 241 return count;
mbed_official 219:993c9b0acbcc 242 }
mbed_official 219:993c9b0acbcc 243
mbed_official 219:993c9b0acbcc 244 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 219:993c9b0acbcc 245 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 246 int timeout;
mbed_official 219:993c9b0acbcc 247
mbed_official 219:993c9b0acbcc 248 // Wait until the byte is received
mbed_official 219:993c9b0acbcc 249 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 250 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 219:993c9b0acbcc 251 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 252 return -1;
mbed_official 219:993c9b0acbcc 253 }
mbed_official 219:993c9b0acbcc 254 }
mbed_official 219:993c9b0acbcc 255
mbed_official 219:993c9b0acbcc 256 return (int)i2c->RXDR;
mbed_official 219:993c9b0acbcc 257 }
mbed_official 219:993c9b0acbcc 258
mbed_official 219:993c9b0acbcc 259 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 219:993c9b0acbcc 260 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 261 int timeout;
mbed_official 219:993c9b0acbcc 262
mbed_official 219:993c9b0acbcc 263 // Wait until the previous byte is transmitted
mbed_official 219:993c9b0acbcc 264 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 265 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 219:993c9b0acbcc 266 if ((timeout--) == 0) {
mbed_official 219:993c9b0acbcc 267 return 0;
mbed_official 219:993c9b0acbcc 268 }
mbed_official 219:993c9b0acbcc 269 }
mbed_official 219:993c9b0acbcc 270
mbed_official 219:993c9b0acbcc 271 i2c->TXDR = (uint8_t)data;
mbed_official 219:993c9b0acbcc 272
mbed_official 219:993c9b0acbcc 273 return 1;
mbed_official 219:993c9b0acbcc 274 }
mbed_official 219:993c9b0acbcc 275
mbed_official 219:993c9b0acbcc 276 void i2c_reset(i2c_t *obj) {
mbed_official 219:993c9b0acbcc 277 if (obj->i2c == I2C_1) {
mbed_official 219:993c9b0acbcc 278 __I2C1_FORCE_RESET();
mbed_official 219:993c9b0acbcc 279 __I2C1_RELEASE_RESET();
mbed_official 219:993c9b0acbcc 280 }
mbed_official 219:993c9b0acbcc 281 if (obj->i2c == I2C_2) {
mbed_official 219:993c9b0acbcc 282 __I2C2_FORCE_RESET();
mbed_official 219:993c9b0acbcc 283 __I2C2_RELEASE_RESET();
mbed_official 219:993c9b0acbcc 284 }
mbed_official 219:993c9b0acbcc 285 }
mbed_official 219:993c9b0acbcc 286
mbed_official 219:993c9b0acbcc 287 #if DEVICE_I2CSLAVE
mbed_official 219:993c9b0acbcc 288
mbed_official 219:993c9b0acbcc 289 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 219:993c9b0acbcc 290 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 291 uint16_t tmpreg = 0;
mbed_official 219:993c9b0acbcc 292
mbed_official 219:993c9b0acbcc 293 // disable
mbed_official 219:993c9b0acbcc 294 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 219:993c9b0acbcc 295 // Get the old register value
mbed_official 219:993c9b0acbcc 296 tmpreg = i2c->OAR1;
mbed_official 219:993c9b0acbcc 297 // Reset address bits
mbed_official 219:993c9b0acbcc 298 tmpreg &= 0xFC00;
mbed_official 219:993c9b0acbcc 299 // Set new address
mbed_official 219:993c9b0acbcc 300 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 219:993c9b0acbcc 301 // Store the new register value
mbed_official 219:993c9b0acbcc 302 i2c->OAR1 = tmpreg;
mbed_official 219:993c9b0acbcc 303 // enable
mbed_official 219:993c9b0acbcc 304 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 219:993c9b0acbcc 305 }
mbed_official 219:993c9b0acbcc 306
mbed_official 219:993c9b0acbcc 307 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 219:993c9b0acbcc 308
mbed_official 219:993c9b0acbcc 309 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 310 uint16_t tmpreg;
mbed_official 219:993c9b0acbcc 311
mbed_official 219:993c9b0acbcc 312 // Get the old register value
mbed_official 219:993c9b0acbcc 313 tmpreg = i2c->OAR1;
mbed_official 219:993c9b0acbcc 314
mbed_official 219:993c9b0acbcc 315 // Enable / disable slave
mbed_official 219:993c9b0acbcc 316 if (enable_slave == 1) {
mbed_official 219:993c9b0acbcc 317 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 219:993c9b0acbcc 318 } else {
mbed_official 219:993c9b0acbcc 319 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 219:993c9b0acbcc 320 }
mbed_official 219:993c9b0acbcc 321
mbed_official 219:993c9b0acbcc 322 // Set new mode
mbed_official 219:993c9b0acbcc 323 i2c->OAR1 = tmpreg;
mbed_official 219:993c9b0acbcc 324
mbed_official 219:993c9b0acbcc 325 }
mbed_official 219:993c9b0acbcc 326
mbed_official 219:993c9b0acbcc 327 // See I2CSlave.h
mbed_official 219:993c9b0acbcc 328 #define NoData 0 // the slave has not been addressed
mbed_official 219:993c9b0acbcc 329 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 219:993c9b0acbcc 330 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 219:993c9b0acbcc 331 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 219:993c9b0acbcc 332
mbed_official 219:993c9b0acbcc 333 int i2c_slave_receive(i2c_t *obj) {
mbed_official 219:993c9b0acbcc 334 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 335 int retValue = NoData;
mbed_official 219:993c9b0acbcc 336
mbed_official 219:993c9b0acbcc 337 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 219:993c9b0acbcc 338 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 219:993c9b0acbcc 339 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 219:993c9b0acbcc 340 retValue = ReadAddressed;
mbed_official 219:993c9b0acbcc 341 else
mbed_official 219:993c9b0acbcc 342 retValue = WriteAddressed;
mbed_official 219:993c9b0acbcc 343
mbed_official 219:993c9b0acbcc 344 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 219:993c9b0acbcc 345 }
mbed_official 219:993c9b0acbcc 346 }
mbed_official 219:993c9b0acbcc 347
mbed_official 219:993c9b0acbcc 348 return (retValue);
mbed_official 219:993c9b0acbcc 349 }
mbed_official 219:993c9b0acbcc 350
mbed_official 219:993c9b0acbcc 351 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 219:993c9b0acbcc 352 char size = 0;
mbed_official 219:993c9b0acbcc 353
mbed_official 219:993c9b0acbcc 354 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 219:993c9b0acbcc 355
mbed_official 219:993c9b0acbcc 356 return size;
mbed_official 219:993c9b0acbcc 357 }
mbed_official 219:993c9b0acbcc 358
mbed_official 219:993c9b0acbcc 359 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 219:993c9b0acbcc 360 char size = 0;
mbed_official 219:993c9b0acbcc 361 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 362
mbed_official 219:993c9b0acbcc 363 do {
mbed_official 219:993c9b0acbcc 364 i2c_byte_write(obj, data[size]);
mbed_official 219:993c9b0acbcc 365 size++;
mbed_official 219:993c9b0acbcc 366 } while (size < length);
mbed_official 219:993c9b0acbcc 367
mbed_official 219:993c9b0acbcc 368 return size;
mbed_official 219:993c9b0acbcc 369 }
mbed_official 219:993c9b0acbcc 370
mbed_official 219:993c9b0acbcc 371
mbed_official 219:993c9b0acbcc 372 #endif // DEVICE_I2CSLAVE
mbed_official 219:993c9b0acbcc 373
mbed_official 219:993c9b0acbcc 374 #endif // DEVICE_I2C