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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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@393:17d2d502961d, 2014-11-07 (annotated)

Committer:
mbed_official
Date:
Fri Nov 07 12:00:11 2014 +0000
Revision:
393:17d2d502961d
Parent:
305:1f0269907d8b
Child:
402:09075a3b15e3
Synchronized with git revision 78a3d4f2301aad7367e924e8231b4411d11038ea



Full URL: https://github.com/mbedmicro/mbed/commit/78a3d4f2301aad7367e924e8231b4411d11038ea/



Toolchain: NUCLEO_F0 - Add missing files for IAR exporter

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 285:31249416b6f9 37 #include "mbed_error.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 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 181:a4cbdfbbd2f4 46 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 181:a4cbdfbbd2f4 47 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 181:a4cbdfbbd2f4 48 {PB_11, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF6_I2C2)},
mbed_official 181:a4cbdfbbd2f4 49 {PB_14, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 181:a4cbdfbbd2f4 50 {NC, NC, 0}
mbed_official 181:a4cbdfbbd2f4 51 };
mbed_official 181:a4cbdfbbd2f4 52
mbed_official 181:a4cbdfbbd2f4 53 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 181:a4cbdfbbd2f4 54 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF1_I2C1)},
mbed_official 181:a4cbdfbbd2f4 55 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 181:a4cbdfbbd2f4 56 {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF6_I2C2)},
mbed_official 181:a4cbdfbbd2f4 57 {PB_13, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF5_I2C2)},
mbed_official 181:a4cbdfbbd2f4 58 {NC, NC, 0}
mbed_official 181:a4cbdfbbd2f4 59 };
mbed_official 181:a4cbdfbbd2f4 60
mbed_official 181:a4cbdfbbd2f4 61 I2C_HandleTypeDef I2cHandle;
mbed_official 181:a4cbdfbbd2f4 62
mbed_official 305:1f0269907d8b 63 int i2c1_inited = 0;
mbed_official 305:1f0269907d8b 64 int i2c2_inited = 0;
mbed_official 305:1f0269907d8b 65
mbed_official 181:a4cbdfbbd2f4 66 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 181:a4cbdfbbd2f4 67 // Determine the I2C to use
mbed_official 181:a4cbdfbbd2f4 68 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 181:a4cbdfbbd2f4 69 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 181:a4cbdfbbd2f4 70
mbed_official 181:a4cbdfbbd2f4 71 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 72 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 181:a4cbdfbbd2f4 73
mbed_official 305:1f0269907d8b 74 // Enable I2C1 clock and pinout if not done
mbed_official 305:1f0269907d8b 75 if ((obj->i2c == I2C_1)&& !i2c1_inited) {
mbed_official 305:1f0269907d8b 76 i2c1_inited = 1;
mbed_official 210:45934c3d812a 77 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 181:a4cbdfbbd2f4 78 __I2C1_CLK_ENABLE();
mbed_official 305:1f0269907d8b 79 // Configure I2C pins
mbed_official 305:1f0269907d8b 80 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 81 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 82 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 83 pin_mode(scl, OpenDrain);
mbed_official 181:a4cbdfbbd2f4 84 }
mbed_official 305:1f0269907d8b 85 // Enable I2C2 clock and pinout if not done
mbed_official 305:1f0269907d8b 86 if ((obj->i2c == I2C_2)&& !i2c2_inited) {
mbed_official 305:1f0269907d8b 87 i2c2_inited = 1;
mbed_official 305:1f0269907d8b 88 __I2C2_CLK_ENABLE();
mbed_official 305:1f0269907d8b 89 // Configure I2C pins
mbed_official 305:1f0269907d8b 90 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 91 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 92 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 93 pin_mode(scl, OpenDrain);
mbed_official 305:1f0269907d8b 94 }
mbed_official 181:a4cbdfbbd2f4 95
mbed_official 181:a4cbdfbbd2f4 96 // Reset to clear pending flags if any
mbed_official 181:a4cbdfbbd2f4 97 i2c_reset(obj);
mbed_official 181:a4cbdfbbd2f4 98
mbed_official 181:a4cbdfbbd2f4 99 // I2C configuration
mbed_official 181:a4cbdfbbd2f4 100 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 181:a4cbdfbbd2f4 101 }
mbed_official 181:a4cbdfbbd2f4 102
mbed_official 181:a4cbdfbbd2f4 103 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 227:7bd0639b8911 104 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 181:a4cbdfbbd2f4 105 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 305:1f0269907d8b 106 int timeout;
mbed_official 305:1f0269907d8b 107
mbed_official 305:1f0269907d8b 108 // wait before init
mbed_official 305:1f0269907d8b 109 timeout = LONG_TIMEOUT;
mbed_official 305:1f0269907d8b 110 while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 181:a4cbdfbbd2f4 111
mbed_official 181:a4cbdfbbd2f4 112 // Common settings: I2C clock = 32 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 181:a4cbdfbbd2f4 113 switch (hz) {
mbed_official 181:a4cbdfbbd2f4 114 case 100000:
mbed_official 181:a4cbdfbbd2f4 115 I2cHandle.Init.Timing = 0x20602938; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 116 break;
mbed_official 181:a4cbdfbbd2f4 117 case 400000:
mbed_official 181:a4cbdfbbd2f4 118 I2cHandle.Init.Timing = 0x00B0122A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 119 break;
mbed_official 181:a4cbdfbbd2f4 120 case 1000000:
mbed_official 181:a4cbdfbbd2f4 121 I2cHandle.Init.Timing = 0x0030040E; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 122 break;
mbed_official 181:a4cbdfbbd2f4 123 default:
mbed_official 181:a4cbdfbbd2f4 124 break;
mbed_official 181:a4cbdfbbd2f4 125 }
mbed_official 181:a4cbdfbbd2f4 126
mbed_official 181:a4cbdfbbd2f4 127 // I2C configuration
mbed_official 181:a4cbdfbbd2f4 128 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 181:a4cbdfbbd2f4 129 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 181:a4cbdfbbd2f4 130 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 181:a4cbdfbbd2f4 131 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 181:a4cbdfbbd2f4 132 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 181:a4cbdfbbd2f4 133 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 181:a4cbdfbbd2f4 134 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 181:a4cbdfbbd2f4 135 HAL_I2C_Init(&I2cHandle);
mbed_official 181:a4cbdfbbd2f4 136 }
mbed_official 181:a4cbdfbbd2f4 137
mbed_official 181:a4cbdfbbd2f4 138 inline int i2c_start(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 139 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 140 int timeout;
mbed_official 181:a4cbdfbbd2f4 141
mbed_official 181:a4cbdfbbd2f4 142 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 143
mbed_official 181:a4cbdfbbd2f4 144 // Clear Acknowledge failure flag
mbed_official 181:a4cbdfbbd2f4 145 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 181:a4cbdfbbd2f4 146
mbed_official 181:a4cbdfbbd2f4 147 // Generate the START condition
mbed_official 181:a4cbdfbbd2f4 148 i2c->CR2 |= I2C_CR2_START;
mbed_official 181:a4cbdfbbd2f4 149
mbed_official 181:a4cbdfbbd2f4 150 // Wait the START condition has been correctly sent
mbed_official 181:a4cbdfbbd2f4 151 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 152 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 181:a4cbdfbbd2f4 153 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 154 return 1;
mbed_official 181:a4cbdfbbd2f4 155 }
mbed_official 181:a4cbdfbbd2f4 156 }
mbed_official 181:a4cbdfbbd2f4 157
mbed_official 181:a4cbdfbbd2f4 158 return 0;
mbed_official 181:a4cbdfbbd2f4 159 }
mbed_official 181:a4cbdfbbd2f4 160
mbed_official 181:a4cbdfbbd2f4 161 inline int i2c_stop(i2c_t *obj) {
mbed_official 181:a4cbdfbbd2f4 162 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 163
mbed_official 181:a4cbdfbbd2f4 164 // Generate the STOP condition
mbed_official 181:a4cbdfbbd2f4 165 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 181:a4cbdfbbd2f4 166
mbed_official 181:a4cbdfbbd2f4 167 return 0;
mbed_official 181:a4cbdfbbd2f4 168 }
mbed_official 181:a4cbdfbbd2f4 169
mbed_official 181:a4cbdfbbd2f4 170 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 202:bd6461c07541 171 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 172 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 173 int timeout;
mbed_official 202:bd6461c07541 174 int count;
mbed_official 202:bd6461c07541 175 int value;
mbed_official 202:bd6461c07541 176
mbed_official 202:bd6461c07541 177 /* update CR2 register */
mbed_official 202:bd6461c07541 178 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 179 | (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 180
mbed_official 202:bd6461c07541 181 // Read all bytes
mbed_official 202:bd6461c07541 182 for (count = 0; count < length; count++) {
mbed_official 202:bd6461c07541 183 value = i2c_byte_read(obj, 0);
mbed_official 202:bd6461c07541 184 data[count] = (char)value;
mbed_official 202:bd6461c07541 185 }
mbed_official 181:a4cbdfbbd2f4 186
mbed_official 202:bd6461c07541 187 // Wait transfer complete
mbed_official 202:bd6461c07541 188 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 189 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 202:bd6461c07541 190 timeout--;
mbed_official 202:bd6461c07541 191 if (timeout == 0) {
mbed_official 247:135e3186a638 192 return -1;
mbed_official 202:bd6461c07541 193 }
mbed_official 202:bd6461c07541 194 }
mbed_official 211:fb8edfff6ae1 195
mbed_official 211:fb8edfff6ae1 196 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 202:bd6461c07541 197
mbed_official 202:bd6461c07541 198 // If not repeated start, send stop.
mbed_official 202:bd6461c07541 199 if (stop) {
mbed_official 202:bd6461c07541 200 i2c_stop(obj);
mbed_official 202:bd6461c07541 201 /* Wait until STOPF flag is set */
mbed_official 202:bd6461c07541 202 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 203 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 202:bd6461c07541 204 timeout--;
mbed_official 202:bd6461c07541 205 if (timeout == 0) {
mbed_official 247:135e3186a638 206 return -1;
mbed_official 202:bd6461c07541 207 }
mbed_official 202:bd6461c07541 208 }
mbed_official 202:bd6461c07541 209 /* Clear STOP Flag */
mbed_official 202:bd6461c07541 210 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 181:a4cbdfbbd2f4 211 }
mbed_official 181:a4cbdfbbd2f4 212
mbed_official 181:a4cbdfbbd2f4 213 return length;
mbed_official 181:a4cbdfbbd2f4 214 }
mbed_official 181:a4cbdfbbd2f4 215
mbed_official 181:a4cbdfbbd2f4 216 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 202:bd6461c07541 217 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 218 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 219 int timeout;
mbed_official 202:bd6461c07541 220 int count;
mbed_official 202:bd6461c07541 221
mbed_official 202:bd6461c07541 222 /* update CR2 register */
mbed_official 202:bd6461c07541 223 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 224 | (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 225
mbed_official 202:bd6461c07541 226 for (count = 0; count < length; count++) {
mbed_official 202:bd6461c07541 227 i2c_byte_write(obj, data[count]);
mbed_official 181:a4cbdfbbd2f4 228 }
mbed_official 181:a4cbdfbbd2f4 229
mbed_official 202:bd6461c07541 230 // Wait transfer complete
mbed_official 202:bd6461c07541 231 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 232 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 202:bd6461c07541 233 timeout--;
mbed_official 202:bd6461c07541 234 if (timeout == 0) {
mbed_official 247:135e3186a638 235 return -1;
mbed_official 211:fb8edfff6ae1 236 }
mbed_official 202:bd6461c07541 237 }
mbed_official 211:fb8edfff6ae1 238
mbed_official 211:fb8edfff6ae1 239 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 202:bd6461c07541 240
mbed_official 202:bd6461c07541 241 // If not repeated start, send stop.
mbed_official 202:bd6461c07541 242 if (stop) {
mbed_official 202:bd6461c07541 243 i2c_stop(obj);
mbed_official 202:bd6461c07541 244 /* Wait until STOPF flag is set */
mbed_official 202:bd6461c07541 245 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 246 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 202:bd6461c07541 247 timeout--;
mbed_official 202:bd6461c07541 248 if (timeout == 0) {
mbed_official 247:135e3186a638 249 return -1;
mbed_official 202:bd6461c07541 250 }
mbed_official 202:bd6461c07541 251 }
mbed_official 202:bd6461c07541 252 /* Clear STOP Flag */
mbed_official 202:bd6461c07541 253 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 202:bd6461c07541 254 }
mbed_official 202:bd6461c07541 255
mbed_official 202:bd6461c07541 256 return count;
mbed_official 181:a4cbdfbbd2f4 257 }
mbed_official 181:a4cbdfbbd2f4 258
mbed_official 181:a4cbdfbbd2f4 259 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 181:a4cbdfbbd2f4 260 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 261 int timeout;
mbed_official 181:a4cbdfbbd2f4 262
mbed_official 181:a4cbdfbbd2f4 263 // Wait until the byte is received
mbed_official 181:a4cbdfbbd2f4 264 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 265 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 266 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 267 return -1;
mbed_official 181:a4cbdfbbd2f4 268 }
mbed_official 181:a4cbdfbbd2f4 269 }
mbed_official 181:a4cbdfbbd2f4 270
mbed_official 181:a4cbdfbbd2f4 271 return (int)i2c->RXDR;
mbed_official 181:a4cbdfbbd2f4 272 }
mbed_official 181:a4cbdfbbd2f4 273
mbed_official 181:a4cbdfbbd2f4 274 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 181:a4cbdfbbd2f4 275 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 276 int timeout;
mbed_official 181:a4cbdfbbd2f4 277
mbed_official 202:bd6461c07541 278 // Wait until the previous byte is transmitted
mbed_official 181:a4cbdfbbd2f4 279 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 280 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 181:a4cbdfbbd2f4 281 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 282 return 0;
mbed_official 181:a4cbdfbbd2f4 283 }
mbed_official 181:a4cbdfbbd2f4 284 }
mbed_official 181:a4cbdfbbd2f4 285
mbed_official 202:bd6461c07541 286 i2c->TXDR = (uint8_t)data;
mbed_official 211:fb8edfff6ae1 287
mbed_official 181:a4cbdfbbd2f4 288 return 1;
mbed_official 181:a4cbdfbbd2f4 289 }
mbed_official 181:a4cbdfbbd2f4 290
mbed_official 181:a4cbdfbbd2f4 291 void i2c_reset(i2c_t *obj) {
mbed_official 305:1f0269907d8b 292 int timeout;
mbed_official 305:1f0269907d8b 293
mbed_official 305:1f0269907d8b 294 // wait before reset
mbed_official 305:1f0269907d8b 295 timeout = LONG_TIMEOUT;
mbed_official 305:1f0269907d8b 296 while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 305:1f0269907d8b 297
mbed_official 181:a4cbdfbbd2f4 298 if (obj->i2c == I2C_1) {
mbed_official 181:a4cbdfbbd2f4 299 __I2C1_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 300 __I2C1_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 301 }
mbed_official 181:a4cbdfbbd2f4 302 if (obj->i2c == I2C_2) {
mbed_official 181:a4cbdfbbd2f4 303 __I2C2_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 304 __I2C2_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 305 }
mbed_official 181:a4cbdfbbd2f4 306 }
mbed_official 181:a4cbdfbbd2f4 307
mbed_official 181:a4cbdfbbd2f4 308 #if DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 309
mbed_official 181:a4cbdfbbd2f4 310 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 181:a4cbdfbbd2f4 311 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 312 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 313
mbed_official 181:a4cbdfbbd2f4 314 // disable
mbed_official 202:bd6461c07541 315 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 316 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 317 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 318 // Reset address bits
mbed_official 181:a4cbdfbbd2f4 319 tmpreg &= 0xFC00;
mbed_official 181:a4cbdfbbd2f4 320 // Set new address
mbed_official 181:a4cbdfbbd2f4 321 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 181:a4cbdfbbd2f4 322 // Store the new register value
mbed_official 181:a4cbdfbbd2f4 323 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 324 // enable
mbed_official 181:a4cbdfbbd2f4 325 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 326 }
mbed_official 181:a4cbdfbbd2f4 327
mbed_official 181:a4cbdfbbd2f4 328 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 181:a4cbdfbbd2f4 329
mbed_official 181:a4cbdfbbd2f4 330 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 331 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 332
mbed_official 181:a4cbdfbbd2f4 333 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 334 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 335
mbed_official 181:a4cbdfbbd2f4 336 // Enable / disable slave
mbed_official 181:a4cbdfbbd2f4 337 if (enable_slave == 1) {
mbed_official 181:a4cbdfbbd2f4 338 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 339 } else {
mbed_official 202:bd6461c07541 340 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 341 }
mbed_official 181:a4cbdfbbd2f4 342
mbed_official 181:a4cbdfbbd2f4 343 // Set new mode
mbed_official 181:a4cbdfbbd2f4 344 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 345
mbed_official 181:a4cbdfbbd2f4 346 }
mbed_official 181:a4cbdfbbd2f4 347
mbed_official 181:a4cbdfbbd2f4 348 // See I2CSlave.h
mbed_official 181:a4cbdfbbd2f4 349 #define NoData 0 // the slave has not been addressed
mbed_official 181:a4cbdfbbd2f4 350 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 181:a4cbdfbbd2f4 351 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 181:a4cbdfbbd2f4 352 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 181:a4cbdfbbd2f4 353
mbed_official 181:a4cbdfbbd2f4 354 int i2c_slave_receive(i2c_t *obj) {
mbed_official 202:bd6461c07541 355 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 356 int retValue = NoData;
mbed_official 181:a4cbdfbbd2f4 357
mbed_official 181:a4cbdfbbd2f4 358 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 181:a4cbdfbbd2f4 359 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 181:a4cbdfbbd2f4 360 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 181:a4cbdfbbd2f4 361 retValue = ReadAddressed;
mbed_official 181:a4cbdfbbd2f4 362 else
mbed_official 181:a4cbdfbbd2f4 363 retValue = WriteAddressed;
mbed_official 181:a4cbdfbbd2f4 364 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 181:a4cbdfbbd2f4 365 }
mbed_official 181:a4cbdfbbd2f4 366 }
mbed_official 181:a4cbdfbbd2f4 367
mbed_official 181:a4cbdfbbd2f4 368 return (retValue);
mbed_official 181:a4cbdfbbd2f4 369 }
mbed_official 181:a4cbdfbbd2f4 370
mbed_official 181:a4cbdfbbd2f4 371 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 202:bd6461c07541 372 char size = 0;
mbed_official 211:fb8edfff6ae1 373
mbed_official 202:bd6461c07541 374 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 181:a4cbdfbbd2f4 375
mbed_official 202:bd6461c07541 376 return size;
mbed_official 181:a4cbdfbbd2f4 377 }
mbed_official 181:a4cbdfbbd2f4 378
mbed_official 181:a4cbdfbbd2f4 379 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 181:a4cbdfbbd2f4 380 char size = 0;
mbed_official 202:bd6461c07541 381 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 382
mbed_official 181:a4cbdfbbd2f4 383 do {
mbed_official 181:a4cbdfbbd2f4 384 i2c_byte_write(obj, data[size]);
mbed_official 181:a4cbdfbbd2f4 385 size++;
mbed_official 181:a4cbdfbbd2f4 386 } while (size < length);
mbed_official 181:a4cbdfbbd2f4 387
mbed_official 181:a4cbdfbbd2f4 388 return size;
mbed_official 181:a4cbdfbbd2f4 389 }
mbed_official 181:a4cbdfbbd2f4 390
mbed_official 181:a4cbdfbbd2f4 391
mbed_official 181:a4cbdfbbd2f4 392 #endif // DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 393
mbed_official 181:a4cbdfbbd2f4 394 #endif // DEVICE_I2C