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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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_NUCLEO_L053R8/i2c_api.c@402:09075a3b15e3, 2014-11-14 (annotated)

Committer:
mbed_official
Date:
Fri Nov 14 09:00:07 2014 +0000
Revision:
402:09075a3b15e3
Parent:
305:1f0269907d8b
Child:
414:4ec4c5b614b0
Synchronized with git revision dffeedc96e731e30785ca4a7842fb9769412bea1



Full URL: https://github.com/mbedmicro/mbed/commit/dffeedc96e731e30785ca4a7842fb9769412bea1/



Targets: add USBTX and USBRX pin definitions for targets that don't provide them

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 402:09075a3b15e3 66 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
mbed_official 402:09075a3b15e3 67 {
mbed_official 181:a4cbdfbbd2f4 68 // Determine the I2C to use
mbed_official 181:a4cbdfbbd2f4 69 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 181:a4cbdfbbd2f4 70 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 181:a4cbdfbbd2f4 71
mbed_official 181:a4cbdfbbd2f4 72 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 73 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 181:a4cbdfbbd2f4 74
mbed_official 305:1f0269907d8b 75 // Enable I2C1 clock and pinout if not done
mbed_official 402:09075a3b15e3 76 if ((obj->i2c == I2C_1) && !i2c1_inited) {
mbed_official 305:1f0269907d8b 77 i2c1_inited = 1;
mbed_official 210:45934c3d812a 78 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 181:a4cbdfbbd2f4 79 __I2C1_CLK_ENABLE();
mbed_official 305:1f0269907d8b 80 // Configure I2C pins
mbed_official 305:1f0269907d8b 81 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 82 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 83 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 84 pin_mode(scl, OpenDrain);
mbed_official 181:a4cbdfbbd2f4 85 }
mbed_official 305:1f0269907d8b 86 // Enable I2C2 clock and pinout if not done
mbed_official 402:09075a3b15e3 87 if ((obj->i2c == I2C_2) && !i2c2_inited) {
mbed_official 305:1f0269907d8b 88 i2c2_inited = 1;
mbed_official 305:1f0269907d8b 89 __I2C2_CLK_ENABLE();
mbed_official 305:1f0269907d8b 90 // Configure I2C pins
mbed_official 305:1f0269907d8b 91 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 92 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 93 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 94 pin_mode(scl, OpenDrain);
mbed_official 305:1f0269907d8b 95 }
mbed_official 181:a4cbdfbbd2f4 96
mbed_official 181:a4cbdfbbd2f4 97 // Reset to clear pending flags if any
mbed_official 181:a4cbdfbbd2f4 98 i2c_reset(obj);
mbed_official 181:a4cbdfbbd2f4 99
mbed_official 181:a4cbdfbbd2f4 100 // I2C configuration
mbed_official 181:a4cbdfbbd2f4 101 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 181:a4cbdfbbd2f4 102 }
mbed_official 181:a4cbdfbbd2f4 103
mbed_official 402:09075a3b15e3 104 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 402:09075a3b15e3 105 {
mbed_official 227:7bd0639b8911 106 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 181:a4cbdfbbd2f4 107 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 305:1f0269907d8b 108 int timeout;
mbed_official 305:1f0269907d8b 109
mbed_official 305:1f0269907d8b 110 // wait before init
mbed_official 305:1f0269907d8b 111 timeout = LONG_TIMEOUT;
mbed_official 402:09075a3b15e3 112 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 181:a4cbdfbbd2f4 113
mbed_official 181:a4cbdfbbd2f4 114 // Common settings: I2C clock = 32 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 181:a4cbdfbbd2f4 115 switch (hz) {
mbed_official 181:a4cbdfbbd2f4 116 case 100000:
mbed_official 181:a4cbdfbbd2f4 117 I2cHandle.Init.Timing = 0x20602938; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 118 break;
mbed_official 181:a4cbdfbbd2f4 119 case 400000:
mbed_official 181:a4cbdfbbd2f4 120 I2cHandle.Init.Timing = 0x00B0122A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 121 break;
mbed_official 181:a4cbdfbbd2f4 122 case 1000000:
mbed_official 181:a4cbdfbbd2f4 123 I2cHandle.Init.Timing = 0x0030040E; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 181:a4cbdfbbd2f4 124 break;
mbed_official 181:a4cbdfbbd2f4 125 default:
mbed_official 181:a4cbdfbbd2f4 126 break;
mbed_official 181:a4cbdfbbd2f4 127 }
mbed_official 181:a4cbdfbbd2f4 128
mbed_official 181:a4cbdfbbd2f4 129 // I2C configuration
mbed_official 181:a4cbdfbbd2f4 130 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 181:a4cbdfbbd2f4 131 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 181:a4cbdfbbd2f4 132 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 181:a4cbdfbbd2f4 133 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 181:a4cbdfbbd2f4 134 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 181:a4cbdfbbd2f4 135 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 181:a4cbdfbbd2f4 136 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 181:a4cbdfbbd2f4 137 HAL_I2C_Init(&I2cHandle);
mbed_official 181:a4cbdfbbd2f4 138 }
mbed_official 181:a4cbdfbbd2f4 139
mbed_official 402:09075a3b15e3 140 inline int i2c_start(i2c_t *obj)
mbed_official 402:09075a3b15e3 141 {
mbed_official 181:a4cbdfbbd2f4 142 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 143 int timeout;
mbed_official 181:a4cbdfbbd2f4 144
mbed_official 181:a4cbdfbbd2f4 145 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 146
mbed_official 181:a4cbdfbbd2f4 147 // Clear Acknowledge failure flag
mbed_official 181:a4cbdfbbd2f4 148 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 181:a4cbdfbbd2f4 149
mbed_official 181:a4cbdfbbd2f4 150 // Generate the START condition
mbed_official 181:a4cbdfbbd2f4 151 i2c->CR2 |= I2C_CR2_START;
mbed_official 181:a4cbdfbbd2f4 152
mbed_official 181:a4cbdfbbd2f4 153 // Wait the START condition has been correctly sent
mbed_official 181:a4cbdfbbd2f4 154 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 155 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 181:a4cbdfbbd2f4 156 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 157 return 1;
mbed_official 181:a4cbdfbbd2f4 158 }
mbed_official 181:a4cbdfbbd2f4 159 }
mbed_official 181:a4cbdfbbd2f4 160
mbed_official 181:a4cbdfbbd2f4 161 return 0;
mbed_official 181:a4cbdfbbd2f4 162 }
mbed_official 181:a4cbdfbbd2f4 163
mbed_official 402:09075a3b15e3 164 inline int i2c_stop(i2c_t *obj)
mbed_official 402:09075a3b15e3 165 {
mbed_official 181:a4cbdfbbd2f4 166 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 167
mbed_official 181:a4cbdfbbd2f4 168 // Generate the STOP condition
mbed_official 181:a4cbdfbbd2f4 169 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 181:a4cbdfbbd2f4 170
mbed_official 181:a4cbdfbbd2f4 171 return 0;
mbed_official 181:a4cbdfbbd2f4 172 }
mbed_official 181:a4cbdfbbd2f4 173
mbed_official 402:09075a3b15e3 174 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 402:09075a3b15e3 175 {
mbed_official 202:bd6461c07541 176 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 177 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 178 int timeout;
mbed_official 202:bd6461c07541 179 int count;
mbed_official 202:bd6461c07541 180 int value;
mbed_official 202:bd6461c07541 181
mbed_official 202:bd6461c07541 182 /* update CR2 register */
mbed_official 202:bd6461c07541 183 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 184 | (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 185
mbed_official 202:bd6461c07541 186 // Read all bytes
mbed_official 202:bd6461c07541 187 for (count = 0; count < length; count++) {
mbed_official 202:bd6461c07541 188 value = i2c_byte_read(obj, 0);
mbed_official 202:bd6461c07541 189 data[count] = (char)value;
mbed_official 202:bd6461c07541 190 }
mbed_official 181:a4cbdfbbd2f4 191
mbed_official 202:bd6461c07541 192 // Wait transfer complete
mbed_official 202:bd6461c07541 193 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 194 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 202:bd6461c07541 195 timeout--;
mbed_official 202:bd6461c07541 196 if (timeout == 0) {
mbed_official 247:135e3186a638 197 return -1;
mbed_official 202:bd6461c07541 198 }
mbed_official 202:bd6461c07541 199 }
mbed_official 211:fb8edfff6ae1 200
mbed_official 211:fb8edfff6ae1 201 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 202:bd6461c07541 202
mbed_official 202:bd6461c07541 203 // If not repeated start, send stop.
mbed_official 202:bd6461c07541 204 if (stop) {
mbed_official 202:bd6461c07541 205 i2c_stop(obj);
mbed_official 202:bd6461c07541 206 /* Wait until STOPF flag is set */
mbed_official 202:bd6461c07541 207 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 208 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 202:bd6461c07541 209 timeout--;
mbed_official 202:bd6461c07541 210 if (timeout == 0) {
mbed_official 247:135e3186a638 211 return -1;
mbed_official 202:bd6461c07541 212 }
mbed_official 202:bd6461c07541 213 }
mbed_official 202:bd6461c07541 214 /* Clear STOP Flag */
mbed_official 202:bd6461c07541 215 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 181:a4cbdfbbd2f4 216 }
mbed_official 181:a4cbdfbbd2f4 217
mbed_official 181:a4cbdfbbd2f4 218 return length;
mbed_official 181:a4cbdfbbd2f4 219 }
mbed_official 181:a4cbdfbbd2f4 220
mbed_official 402:09075a3b15e3 221 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 402:09075a3b15e3 222 {
mbed_official 202:bd6461c07541 223 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 224 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 202:bd6461c07541 225 int timeout;
mbed_official 202:bd6461c07541 226 int count;
mbed_official 202:bd6461c07541 227
mbed_official 202:bd6461c07541 228 /* update CR2 register */
mbed_official 202:bd6461c07541 229 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 230 | (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 231
mbed_official 202:bd6461c07541 232 for (count = 0; count < length; count++) {
mbed_official 202:bd6461c07541 233 i2c_byte_write(obj, data[count]);
mbed_official 181:a4cbdfbbd2f4 234 }
mbed_official 181:a4cbdfbbd2f4 235
mbed_official 202:bd6461c07541 236 // Wait transfer complete
mbed_official 202:bd6461c07541 237 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 238 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 202:bd6461c07541 239 timeout--;
mbed_official 202:bd6461c07541 240 if (timeout == 0) {
mbed_official 247:135e3186a638 241 return -1;
mbed_official 211:fb8edfff6ae1 242 }
mbed_official 202:bd6461c07541 243 }
mbed_official 211:fb8edfff6ae1 244
mbed_official 211:fb8edfff6ae1 245 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 202:bd6461c07541 246
mbed_official 202:bd6461c07541 247 // If not repeated start, send stop.
mbed_official 202:bd6461c07541 248 if (stop) {
mbed_official 202:bd6461c07541 249 i2c_stop(obj);
mbed_official 202:bd6461c07541 250 /* Wait until STOPF flag is set */
mbed_official 202:bd6461c07541 251 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 252 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 202:bd6461c07541 253 timeout--;
mbed_official 202:bd6461c07541 254 if (timeout == 0) {
mbed_official 247:135e3186a638 255 return -1;
mbed_official 202:bd6461c07541 256 }
mbed_official 202:bd6461c07541 257 }
mbed_official 202:bd6461c07541 258 /* Clear STOP Flag */
mbed_official 202:bd6461c07541 259 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 202:bd6461c07541 260 }
mbed_official 202:bd6461c07541 261
mbed_official 202:bd6461c07541 262 return count;
mbed_official 181:a4cbdfbbd2f4 263 }
mbed_official 181:a4cbdfbbd2f4 264
mbed_official 402:09075a3b15e3 265 int i2c_byte_read(i2c_t *obj, int last)
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 181:a4cbdfbbd2f4 270 // Wait until the byte is received
mbed_official 181:a4cbdfbbd2f4 271 timeout = FLAG_TIMEOUT;
mbed_official 181:a4cbdfbbd2f4 272 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 181:a4cbdfbbd2f4 273 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 274 return -1;
mbed_official 181:a4cbdfbbd2f4 275 }
mbed_official 181:a4cbdfbbd2f4 276 }
mbed_official 181:a4cbdfbbd2f4 277
mbed_official 181:a4cbdfbbd2f4 278 return (int)i2c->RXDR;
mbed_official 181:a4cbdfbbd2f4 279 }
mbed_official 181:a4cbdfbbd2f4 280
mbed_official 402:09075a3b15e3 281 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 402:09075a3b15e3 282 {
mbed_official 181:a4cbdfbbd2f4 283 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 284 int timeout;
mbed_official 181:a4cbdfbbd2f4 285
mbed_official 202:bd6461c07541 286 // Wait until the previous byte is transmitted
mbed_official 181:a4cbdfbbd2f4 287 timeout = FLAG_TIMEOUT;
mbed_official 202:bd6461c07541 288 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 181:a4cbdfbbd2f4 289 if ((timeout--) == 0) {
mbed_official 181:a4cbdfbbd2f4 290 return 0;
mbed_official 181:a4cbdfbbd2f4 291 }
mbed_official 181:a4cbdfbbd2f4 292 }
mbed_official 181:a4cbdfbbd2f4 293
mbed_official 202:bd6461c07541 294 i2c->TXDR = (uint8_t)data;
mbed_official 211:fb8edfff6ae1 295
mbed_official 181:a4cbdfbbd2f4 296 return 1;
mbed_official 181:a4cbdfbbd2f4 297 }
mbed_official 181:a4cbdfbbd2f4 298
mbed_official 402:09075a3b15e3 299 void i2c_reset(i2c_t *obj)
mbed_official 402:09075a3b15e3 300 {
mbed_official 305:1f0269907d8b 301 int timeout;
mbed_official 402:09075a3b15e3 302
mbed_official 305:1f0269907d8b 303 // wait before reset
mbed_official 305:1f0269907d8b 304 timeout = LONG_TIMEOUT;
mbed_official 402:09075a3b15e3 305 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 305:1f0269907d8b 306
mbed_official 181:a4cbdfbbd2f4 307 if (obj->i2c == I2C_1) {
mbed_official 181:a4cbdfbbd2f4 308 __I2C1_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 309 __I2C1_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 310 }
mbed_official 181:a4cbdfbbd2f4 311 if (obj->i2c == I2C_2) {
mbed_official 181:a4cbdfbbd2f4 312 __I2C2_FORCE_RESET();
mbed_official 181:a4cbdfbbd2f4 313 __I2C2_RELEASE_RESET();
mbed_official 181:a4cbdfbbd2f4 314 }
mbed_official 181:a4cbdfbbd2f4 315 }
mbed_official 181:a4cbdfbbd2f4 316
mbed_official 181:a4cbdfbbd2f4 317 #if DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 318
mbed_official 402:09075a3b15e3 319 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 402:09075a3b15e3 320 {
mbed_official 181:a4cbdfbbd2f4 321 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 322 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 323
mbed_official 181:a4cbdfbbd2f4 324 // disable
mbed_official 202:bd6461c07541 325 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 326 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 327 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 328 // Reset address bits
mbed_official 181:a4cbdfbbd2f4 329 tmpreg &= 0xFC00;
mbed_official 181:a4cbdfbbd2f4 330 // Set new address
mbed_official 181:a4cbdfbbd2f4 331 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 181:a4cbdfbbd2f4 332 // Store the new register value
mbed_official 181:a4cbdfbbd2f4 333 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 334 // enable
mbed_official 181:a4cbdfbbd2f4 335 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 336 }
mbed_official 181:a4cbdfbbd2f4 337
mbed_official 402:09075a3b15e3 338 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 402:09075a3b15e3 339 {
mbed_official 181:a4cbdfbbd2f4 340
mbed_official 181:a4cbdfbbd2f4 341 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 342 uint16_t tmpreg;
mbed_official 181:a4cbdfbbd2f4 343
mbed_official 181:a4cbdfbbd2f4 344 // Get the old register value
mbed_official 181:a4cbdfbbd2f4 345 tmpreg = i2c->OAR1;
mbed_official 181:a4cbdfbbd2f4 346
mbed_official 181:a4cbdfbbd2f4 347 // Enable / disable slave
mbed_official 181:a4cbdfbbd2f4 348 if (enable_slave == 1) {
mbed_official 181:a4cbdfbbd2f4 349 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 181:a4cbdfbbd2f4 350 } else {
mbed_official 202:bd6461c07541 351 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 181:a4cbdfbbd2f4 352 }
mbed_official 181:a4cbdfbbd2f4 353
mbed_official 181:a4cbdfbbd2f4 354 // Set new mode
mbed_official 181:a4cbdfbbd2f4 355 i2c->OAR1 = tmpreg;
mbed_official 181:a4cbdfbbd2f4 356
mbed_official 181:a4cbdfbbd2f4 357 }
mbed_official 181:a4cbdfbbd2f4 358
mbed_official 181:a4cbdfbbd2f4 359 // See I2CSlave.h
mbed_official 181:a4cbdfbbd2f4 360 #define NoData 0 // the slave has not been addressed
mbed_official 181:a4cbdfbbd2f4 361 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 181:a4cbdfbbd2f4 362 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 181:a4cbdfbbd2f4 363 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 181:a4cbdfbbd2f4 364
mbed_official 402:09075a3b15e3 365 int i2c_slave_receive(i2c_t *obj)
mbed_official 402:09075a3b15e3 366 {
mbed_official 202:bd6461c07541 367 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 368 int retValue = NoData;
mbed_official 181:a4cbdfbbd2f4 369
mbed_official 181:a4cbdfbbd2f4 370 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 181:a4cbdfbbd2f4 371 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 181:a4cbdfbbd2f4 372 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 181:a4cbdfbbd2f4 373 retValue = ReadAddressed;
mbed_official 181:a4cbdfbbd2f4 374 else
mbed_official 181:a4cbdfbbd2f4 375 retValue = WriteAddressed;
mbed_official 181:a4cbdfbbd2f4 376 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 181:a4cbdfbbd2f4 377 }
mbed_official 181:a4cbdfbbd2f4 378 }
mbed_official 181:a4cbdfbbd2f4 379
mbed_official 181:a4cbdfbbd2f4 380 return (retValue);
mbed_official 181:a4cbdfbbd2f4 381 }
mbed_official 181:a4cbdfbbd2f4 382
mbed_official 402:09075a3b15e3 383 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 402:09075a3b15e3 384 {
mbed_official 202:bd6461c07541 385 char size = 0;
mbed_official 211:fb8edfff6ae1 386
mbed_official 202:bd6461c07541 387 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 181:a4cbdfbbd2f4 388
mbed_official 202:bd6461c07541 389 return size;
mbed_official 181:a4cbdfbbd2f4 390 }
mbed_official 181:a4cbdfbbd2f4 391
mbed_official 402:09075a3b15e3 392 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 402:09075a3b15e3 393 {
mbed_official 181:a4cbdfbbd2f4 394 char size = 0;
mbed_official 202:bd6461c07541 395 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 181:a4cbdfbbd2f4 396
mbed_official 181:a4cbdfbbd2f4 397 do {
mbed_official 181:a4cbdfbbd2f4 398 i2c_byte_write(obj, data[size]);
mbed_official 181:a4cbdfbbd2f4 399 size++;
mbed_official 181:a4cbdfbbd2f4 400 } while (size < length);
mbed_official 181:a4cbdfbbd2f4 401
mbed_official 181:a4cbdfbbd2f4 402 return size;
mbed_official 181:a4cbdfbbd2f4 403 }
mbed_official 181:a4cbdfbbd2f4 404
mbed_official 181:a4cbdfbbd2f4 405
mbed_official 181:a4cbdfbbd2f4 406 #endif // DEVICE_I2CSLAVE
mbed_official 181:a4cbdfbbd2f4 407
mbed_official 181:a4cbdfbbd2f4 408 #endif // DEVICE_I2C