mbed official / mbed-src

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_NUCLEO_L053R8/i2c_api.c@440:8a0b45cd594f, 2014-12-16 (annotated)

Committer:
mbed_official
Date:
Tue Dec 16 08:15:08 2014 +0000
Revision:
440:8a0b45cd594f
Parent:
414:4ec4c5b614b0
Child:
489:119543c9f674
Synchronized with git revision 67fbbf0b635d0c0d93fbe433306c537c2ad206aa



Full URL: https://github.com/mbedmicro/mbed/commit/67fbbf0b635d0c0d93fbe433306c537c2ad206aa/



Targets: nrf51 - updating app_timer.c from Norid'c SDKv7.1.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 181:a4cbdfbbd2f4 1 /* mbed Microcontroller Library
mbed_official 181:a4cbdfbbd2f4 2 *******************************************************************************
mbed_official 181:a4cbdfbbd2f4 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 181:a4cbdfbbd2f4 4 * All rights reserved.
mbed_official 181:a4cbdfbbd2f4 5 *
mbed_official 181:a4cbdfbbd2f4 6 * Redistribution and use in source and binary forms, with or without
mbed_official 181:a4cbdfbbd2f4 7 * modification, are permitted provided that the following conditions are met:
mbed_official 181:a4cbdfbbd2f4 8 *
mbed_official 181:a4cbdfbbd2f4 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 181:a4cbdfbbd2f4 10 * this list of conditions and the following disclaimer.
mbed_official 181:a4cbdfbbd2f4 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 181:a4cbdfbbd2f4 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 181:a4cbdfbbd2f4 13 * and/or other materials provided with the distribution.
mbed_official 181:a4cbdfbbd2f4 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 181:a4cbdfbbd2f4 15 * may be used to endorse or promote products derived from this software
mbed_official 181:a4cbdfbbd2f4 16 * without specific prior written permission.
mbed_official 181:a4cbdfbbd2f4 17 *
mbed_official 181:a4cbdfbbd2f4 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 181:a4cbdfbbd2f4 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 181:a4cbdfbbd2f4 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 181:a4cbdfbbd2f4 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 181:a4cbdfbbd2f4 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 181:a4cbdfbbd2f4 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 181:a4cbdfbbd2f4 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 181:a4cbdfbbd2f4 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 181:a4cbdfbbd2f4 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 181:a4cbdfbbd2f4 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 181:a4cbdfbbd2f4 28 *******************************************************************************
mbed_official 181:a4cbdfbbd2f4 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 181:a4cbdfbbd2f4 31 #include "i2c_api.h"
mbed_official 181:a4cbdfbbd2f4 32
mbed_official 181:a4cbdfbbd2f4 33 #if DEVICE_I2C
mbed_official 181:a4cbdfbbd2f4 34
mbed_official 181:a4cbdfbbd2f4 35 #include "cmsis.h"
mbed_official 181:a4cbdfbbd2f4 36 #include "pinmap.h"
mbed_official 414:4ec4c5b614b0 37 #include "PeripheralPins.h"
mbed_official 181:a4cbdfbbd2f4 38
mbed_official 181:a4cbdfbbd2f4 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 181:a4cbdfbbd2f4 40 not based on accurate values, they just guarantee that the application will
mbed_official 181:a4cbdfbbd2f4 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 181:a4cbdfbbd2f4 42 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 181:a4cbdfbbd2f4 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 181:a4cbdfbbd2f4 44
mbed_official 181:a4cbdfbbd2f4 45 I2C_HandleTypeDef I2cHandle;
mbed_official 181:a4cbdfbbd2f4 46
mbed_official 305:1f0269907d8b 47 int i2c1_inited = 0;
mbed_official 305:1f0269907d8b 48 int i2c2_inited = 0;
mbed_official 305:1f0269907d8b 49
mbed_official 402:09075a3b15e3 50 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
mbed_official 402:09075a3b15e3 51 {
mbed_official 181:a4cbdfbbd2f4 52 // Determine the I2C to use
mbed_official 181:a4cbdfbbd2f4 53 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 181:a4cbdfbbd2f4 54 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 181:a4cbdfbbd2f4 55
mbed_official 181:a4cbdfbbd2f4 56 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 57 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 181:a4cbdfbbd2f4 58
mbed_official 305:1f0269907d8b 59 // Enable I2C1 clock and pinout if not done
mbed_official 402:09075a3b15e3 60 if ((obj->i2c == I2C_1) && !i2c1_inited) {
mbed_official 305:1f0269907d8b 61 i2c1_inited = 1;
mbed_official 210:45934c3d812a 62 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 181:a4cbdfbbd2f4 63 __I2C1_CLK_ENABLE();
mbed_official 305:1f0269907d8b 64 // Configure I2C pins
mbed_official 305:1f0269907d8b 65 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 66 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 67 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 68 pin_mode(scl, OpenDrain);
mbed_official 181:a4cbdfbbd2f4 69 }
mbed_official 305:1f0269907d8b 70 // Enable I2C2 clock and pinout if not done
mbed_official 402:09075a3b15e3 71 if ((obj->i2c == I2C_2) && !i2c2_inited) {
mbed_official 305:1f0269907d8b 72 i2c2_inited = 1;
mbed_official 305:1f0269907d8b 73 __I2C2_CLK_ENABLE();
mbed_official 305:1f0269907d8b 74 // Configure I2C pins
mbed_official 305:1f0269907d8b 75 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 76 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 77 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 78 pin_mode(scl, OpenDrain);
mbed_official 305:1f0269907d8b 79 }
mbed_official 181:a4cbdfbbd2f4 80
mbed_official 181:a4cbdfbbd2f4 81 // Reset to clear pending flags if any
mbed_official 181:a4cbdfbbd2f4 82 i2c_reset(obj);
mbed_official 181:a4cbdfbbd2f4 83
mbed_official 181:a4cbdfbbd2f4 84 // I2C configuration
mbed_official 181:a4cbdfbbd2f4 85 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 181:a4cbdfbbd2f4 86 }
mbed_official 181:a4cbdfbbd2f4 87
mbed_official 402:09075a3b15e3 88 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 402:09075a3b15e3 89 {
mbed_official 227:7bd0639b8911 90 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 181:a4cbdfbbd2f4 91 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 305:1f0269907d8b 92 int timeout;
mbed_official 305:1f0269907d8b 93
mbed_official 305:1f0269907d8b 94 // wait before init
mbed_official 305:1f0269907d8b 95 timeout = LONG_TIMEOUT;
mbed_official 402:09075a3b15e3 96 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 181:a4cbdfbbd2f4 97
mbed_official 181:a4cbdfbbd2f4 98 // Common settings: I2C clock = 32 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 181:a4cbdfbbd2f4 99 switch (hz) {
mbed_official 181:a4cbdfbbd2f4 100 case 100000:
mbed_official 181:a4cbdfbbd2f4 101 I2cHandle.Init.Timing = 0x20602938; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 102 break;
mbed_official 181:a4cbdfbbd2f4 103 case 400000:
mbed_official 181:a4cbdfbbd2f4 104 I2cHandle.Init.Timing = 0x00B0122A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 105 break;
mbed_official 181:a4cbdfbbd2f4 106 case 1000000:
mbed_official 181:a4cbdfbbd2f4 107 I2cHandle.Init.Timing = 0x0030040E; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 108 break;
mbed_official 181:a4cbdfbbd2f4 109 default:
mbed_official 181:a4cbdfbbd2f4 110 break;
mbed_official 181:a4cbdfbbd2f4 111 }
mbed_official 181:a4cbdfbbd2f4 112
mbed_official 181:a4cbdfbbd2f4 113 // I2C configuration
mbed_official 181:a4cbdfbbd2f4 114 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 181:a4cbdfbbd2f4 115 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 181:a4cbdfbbd2f4 116 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 181:a4cbdfbbd2f4 117 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 181:a4cbdfbbd2f4 118 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 181:a4cbdfbbd2f4 119 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 181:a4cbdfbbd2f4 120 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 181:a4cbdfbbd2f4 121 HAL_I2C_Init(&I2cHandle);
mbed_official 181:a4cbdfbbd2f4 122 }
mbed_official 181:a4cbdfbbd2f4 123
mbed_official 402:09075a3b15e3 124 inline int i2c_start(i2c_t *obj)
mbed_official 402:09075a3b15e3 125 {
mbed_official 181:a4cbdfbbd2f4 126 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 127 int timeout;
mbed_official 181:a4cbdfbbd2f4 128
mbed_official 181:a4cbdfbbd2f4 129 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 130
mbed_official 181:a4cbdfbbd2f4 131 // Clear Acknowledge failure flag
mbed_official 181:a4cbdfbbd2f4 132 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 181:a4cbdfbbd2f4 133
mbed_official 181:a4cbdfbbd2f4 134 // Generate the START condition
mbed_official 181:a4cbdfbbd2f4 135 i2c->CR2 |= I2C_CR2_START;
mbed_official 181:a4cbdfbbd2f4 136
mbed_official 181:a4cbdfbbd2f4 137 // Wait the START condition has been correctly sent
mbed_official 181:a4cbdfbbd2f4 138 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 139 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 181:a4cbdfbbd2f4 140 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 141 return 1;
mbed_official 181:a4cbdfbbd2f4 142 }
mbed_official 181:a4cbdfbbd2f4 143 }
mbed_official 181:a4cbdfbbd2f4 144
mbed_official 181:a4cbdfbbd2f4 145 return 0;
mbed_official 181:a4cbdfbbd2f4 146 }
mbed_official 181:a4cbdfbbd2f4 147
mbed_official 402:09075a3b15e3 148 inline int i2c_stop(i2c_t *obj)
mbed_official 402:09075a3b15e3 149 {
mbed_official 181:a4cbdfbbd2f4 150 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 151
mbed_official 181:a4cbdfbbd2f4 152 // Generate the STOP condition
mbed_official 181:a4cbdfbbd2f4 153 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 181:a4cbdfbbd2f4 154
mbed_official 181:a4cbdfbbd2f4 155 return 0;
mbed_official 181:a4cbdfbbd2f4 156 }
mbed_official 181:a4cbdfbbd2f4 157
mbed_official 402:09075a3b15e3 158 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 402:09075a3b15e3 159 {
mbed_official 202:bd6461c07541 160 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 161 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 162 int timeout;
mbed_official 202:bd6461c07541 163 int count;
mbed_official 202:bd6461c07541 164 int value;
mbed_official 202:bd6461c07541 165
mbed_official 202:bd6461c07541 166 /* update CR2 register */
mbed_official 202:bd6461c07541 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 211:fb8edfff6ae1 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 211:fb8edfff6ae1 169
mbed_official 202:bd6461c07541 170 // Read all bytes
mbed_official 202:bd6461c07541 171 for (count = 0; count < length; count++) {
mbed_official 202:bd6461c07541 172 value = i2c_byte_read(obj, 0);
mbed_official 202:bd6461c07541 173 data[count] = (char)value;
mbed_official 202:bd6461c07541 174 }
mbed_official 181:a4cbdfbbd2f4 175
mbed_official 202:bd6461c07541 176 // Wait transfer complete
mbed_official 202:bd6461c07541 177 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 178 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 202:bd6461c07541 179 timeout--;
mbed_official 202:bd6461c07541 180 if (timeout == 0) {
mbed_official 247:135e3186a638 181 return -1;
mbed_official 202:bd6461c07541 182 }
mbed_official 202:bd6461c07541 183 }
mbed_official 211:fb8edfff6ae1 184
mbed_official 211:fb8edfff6ae1 185 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 202:bd6461c07541 186
mbed_official 202:bd6461c07541 187 // If not repeated start, send stop.
mbed_official 202:bd6461c07541 188 if (stop) {
mbed_official 202:bd6461c07541 189 i2c_stop(obj);
mbed_official 202:bd6461c07541 190 /* Wait until STOPF flag is set */
mbed_official 202:bd6461c07541 191 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 192 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 202:bd6461c07541 193 timeout--;
mbed_official 202:bd6461c07541 194 if (timeout == 0) {
mbed_official 247:135e3186a638 195 return -1;
mbed_official 202:bd6461c07541 196 }
mbed_official 202:bd6461c07541 197 }
mbed_official 202:bd6461c07541 198 /* Clear STOP Flag */
mbed_official 202:bd6461c07541 199 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 181:a4cbdfbbd2f4 200 }
mbed_official 181:a4cbdfbbd2f4 201
mbed_official 181:a4cbdfbbd2f4 202 return length;
mbed_official 181:a4cbdfbbd2f4 203 }
mbed_official 181:a4cbdfbbd2f4 204
mbed_official 402:09075a3b15e3 205 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 402:09075a3b15e3 206 {
mbed_official 202:bd6461c07541 207 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 208 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 209 int timeout;
mbed_official 202:bd6461c07541 210 int count;
mbed_official 202:bd6461c07541 211
mbed_official 202:bd6461c07541 212 /* update CR2 register */
mbed_official 202:bd6461c07541 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 211:fb8edfff6ae1 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 181:a4cbdfbbd2f4 215
mbed_official 202:bd6461c07541 216 for (count = 0; count < length; count++) {
mbed_official 202:bd6461c07541 217 i2c_byte_write(obj, data[count]);
mbed_official 181:a4cbdfbbd2f4 218 }
mbed_official 181:a4cbdfbbd2f4 219
mbed_official 202:bd6461c07541 220 // Wait transfer complete
mbed_official 202:bd6461c07541 221 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 222 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 202:bd6461c07541 223 timeout--;
mbed_official 202:bd6461c07541 224 if (timeout == 0) {
mbed_official 247:135e3186a638 225 return -1;
mbed_official 211:fb8edfff6ae1 226 }
mbed_official 202:bd6461c07541 227 }
mbed_official 211:fb8edfff6ae1 228
mbed_official 211:fb8edfff6ae1 229 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 202:bd6461c07541 230
mbed_official 202:bd6461c07541 231 // If not repeated start, send stop.
mbed_official 202:bd6461c07541 232 if (stop) {
mbed_official 202:bd6461c07541 233 i2c_stop(obj);
mbed_official 202:bd6461c07541 234 /* Wait until STOPF flag is set */
mbed_official 202:bd6461c07541 235 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 236 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 202:bd6461c07541 237 timeout--;
mbed_official 202:bd6461c07541 238 if (timeout == 0) {
mbed_official 247:135e3186a638 239 return -1;
mbed_official 202:bd6461c07541 240 }
mbed_official 202:bd6461c07541 241 }
mbed_official 202:bd6461c07541 242 /* Clear STOP Flag */
mbed_official 202:bd6461c07541 243 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 202:bd6461c07541 244 }
mbed_official 202:bd6461c07541 245
mbed_official 202:bd6461c07541 246 return count;
mbed_official 181:a4cbdfbbd2f4 247 }
mbed_official 181:a4cbdfbbd2f4 248
mbed_official 402:09075a3b15e3 249 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 402:09075a3b15e3 250 {
mbed_official 181:a4cbdfbbd2f4 251 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 252 int timeout;
mbed_official 181:a4cbdfbbd2f4 253
mbed_official 181:a4cbdfbbd2f4 254 // Wait until the byte is received
mbed_official 181:a4cbdfbbd2f4 255 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 256 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 257 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 258 return -1;
mbed_official 181:a4cbdfbbd2f4 259 }
mbed_official 181:a4cbdfbbd2f4 260 }
mbed_official 181:a4cbdfbbd2f4 261
mbed_official 181:a4cbdfbbd2f4 262 return (int)i2c->RXDR;
mbed_official 181:a4cbdfbbd2f4 263 }
mbed_official 181:a4cbdfbbd2f4 264
mbed_official 402:09075a3b15e3 265 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 402:09075a3b15e3 266 {
mbed_official 181:a4cbdfbbd2f4 267 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 268 int timeout;
mbed_official 181:a4cbdfbbd2f4 269
mbed_official 202:bd6461c07541 270 // Wait until the previous byte is transmitted
mbed_official 181:a4cbdfbbd2f4 271 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 272 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 181:a4cbdfbbd2f4 273 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 274 return 0;
mbed_official 181:a4cbdfbbd2f4 275 }
mbed_official 181:a4cbdfbbd2f4 276 }
mbed_official 181:a4cbdfbbd2f4 277
mbed_official 202:bd6461c07541 278 i2c->TXDR = (uint8_t)data;
mbed_official 211:fb8edfff6ae1 279
mbed_official 181:a4cbdfbbd2f4 280 return 1;
mbed_official 181:a4cbdfbbd2f4 281 }
mbed_official 181:a4cbdfbbd2f4 282
mbed_official 402:09075a3b15e3 283 void i2c_reset(i2c_t *obj)
mbed_official 402:09075a3b15e3 284 {
mbed_official 305:1f0269907d8b 285 int timeout;
mbed_official 402:09075a3b15e3 286
mbed_official 305:1f0269907d8b 287 // wait before reset
mbed_official 305:1f0269907d8b 288 timeout = LONG_TIMEOUT;
mbed_official 402:09075a3b15e3 289 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 305:1f0269907d8b 290
mbed_official 181:a4cbdfbbd2f4 291 if (obj->i2c == I2C_1) {
mbed_official 181:a4cbdfbbd2f4 292 __I2C1_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 293 __I2C1_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 294 }
mbed_official 181:a4cbdfbbd2f4 295 if (obj->i2c == I2C_2) {
mbed_official 181:a4cbdfbbd2f4 296 __I2C2_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 297 __I2C2_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 298 }
mbed_official 181:a4cbdfbbd2f4 299 }
mbed_official 181:a4cbdfbbd2f4 300
mbed_official 181:a4cbdfbbd2f4 301 #if DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 302
mbed_official 402:09075a3b15e3 303 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 402:09075a3b15e3 304 {
mbed_official 181:a4cbdfbbd2f4 305 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 306 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 307
mbed_official 181:a4cbdfbbd2f4 308 // disable
mbed_official 202:bd6461c07541 309 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 310 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 311 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 312 // Reset address bits
mbed_official 181:a4cbdfbbd2f4 313 tmpreg &= 0xFC00;
mbed_official 181:a4cbdfbbd2f4 314 // Set new address
mbed_official 181:a4cbdfbbd2f4 315 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 181:a4cbdfbbd2f4 316 // Store the new register value
mbed_official 181:a4cbdfbbd2f4 317 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 318 // enable
mbed_official 181:a4cbdfbbd2f4 319 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 320 }
mbed_official 181:a4cbdfbbd2f4 321
mbed_official 402:09075a3b15e3 322 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 402:09075a3b15e3 323 {
mbed_official 181:a4cbdfbbd2f4 324
mbed_official 181:a4cbdfbbd2f4 325 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 326 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 327
mbed_official 181:a4cbdfbbd2f4 328 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 329 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 330
mbed_official 181:a4cbdfbbd2f4 331 // Enable / disable slave
mbed_official 181:a4cbdfbbd2f4 332 if (enable_slave == 1) {
mbed_official 181:a4cbdfbbd2f4 333 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 334 } else {
mbed_official 202:bd6461c07541 335 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 336 }
mbed_official 181:a4cbdfbbd2f4 337
mbed_official 181:a4cbdfbbd2f4 338 // Set new mode
mbed_official 181:a4cbdfbbd2f4 339 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 340
mbed_official 181:a4cbdfbbd2f4 341 }
mbed_official 181:a4cbdfbbd2f4 342
mbed_official 181:a4cbdfbbd2f4 343 // See I2CSlave.h
mbed_official 181:a4cbdfbbd2f4 344 #define NoData 0 // the slave has not been addressed
mbed_official 181:a4cbdfbbd2f4 345 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 181:a4cbdfbbd2f4 346 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 181:a4cbdfbbd2f4 347 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 181:a4cbdfbbd2f4 348
mbed_official 402:09075a3b15e3 349 int i2c_slave_receive(i2c_t *obj)
mbed_official 402:09075a3b15e3 350 {
mbed_official 202:bd6461c07541 351 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 352 int retValue = NoData;
mbed_official 181:a4cbdfbbd2f4 353
mbed_official 181:a4cbdfbbd2f4 354 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 181:a4cbdfbbd2f4 355 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 181:a4cbdfbbd2f4 356 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 181:a4cbdfbbd2f4 357 retValue = ReadAddressed;
mbed_official 181:a4cbdfbbd2f4 358 else
mbed_official 181:a4cbdfbbd2f4 359 retValue = WriteAddressed;
mbed_official 181:a4cbdfbbd2f4 360 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 181:a4cbdfbbd2f4 361 }
mbed_official 181:a4cbdfbbd2f4 362 }
mbed_official 181:a4cbdfbbd2f4 363
mbed_official 181:a4cbdfbbd2f4 364 return (retValue);
mbed_official 181:a4cbdfbbd2f4 365 }
mbed_official 181:a4cbdfbbd2f4 366
mbed_official 402:09075a3b15e3 367 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 402:09075a3b15e3 368 {
mbed_official 202:bd6461c07541 369 char size = 0;
mbed_official 211:fb8edfff6ae1 370
mbed_official 202:bd6461c07541 371 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 181:a4cbdfbbd2f4 372
mbed_official 202:bd6461c07541 373 return size;
mbed_official 181:a4cbdfbbd2f4 374 }
mbed_official 181:a4cbdfbbd2f4 375
mbed_official 402:09075a3b15e3 376 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 402:09075a3b15e3 377 {
mbed_official 181:a4cbdfbbd2f4 378 char size = 0;
mbed_official 202:bd6461c07541 379 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 380
mbed_official 181:a4cbdfbbd2f4 381 do {
mbed_official 181:a4cbdfbbd2f4 382 i2c_byte_write(obj, data[size]);
mbed_official 181:a4cbdfbbd2f4 383 size++;
mbed_official 181:a4cbdfbbd2f4 384 } while (size < length);
mbed_official 181:a4cbdfbbd2f4 385
mbed_official 181:a4cbdfbbd2f4 386 return size;
mbed_official 181:a4cbdfbbd2f4 387 }
mbed_official 181:a4cbdfbbd2f4 388
mbed_official 181:a4cbdfbbd2f4 389
mbed_official 181:a4cbdfbbd2f4 390 #endif // DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 391
mbed_official 181:a4cbdfbbd2f4 392 #endif // DEVICE_I2C