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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_F072RB/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 
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 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 414:4ec4c5b614b0 37 #include "PeripheralPins.h"
mbed_official 219:993c9b0acbcc 38
mbed_official 219:993c9b0acbcc 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 219:993c9b0acbcc 40 not based on accurate values, they just guarantee that the application will
mbed_official 219:993c9b0acbcc 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 219:993c9b0acbcc 42 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 219:993c9b0acbcc 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 219:993c9b0acbcc 44
mbed_official 219:993c9b0acbcc 45 I2C_HandleTypeDef I2cHandle;
mbed_official 219:993c9b0acbcc 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 219:993c9b0acbcc 52 // Determine the I2C to use
mbed_official 219:993c9b0acbcc 53 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 219:993c9b0acbcc 54 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 219:993c9b0acbcc 55
mbed_official 219:993c9b0acbcc 56 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 239:8cadf13dff33 57 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 219:993c9b0acbcc 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 219:993c9b0acbcc 62 __HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
mbed_official 219:993c9b0acbcc 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 219:993c9b0acbcc 69 }
mbed_official 404:cbc7dfcb0ce9 70
mbed_official 305:1f0269907d8b 71 // Enable I2C2 clock and pinout if not done
mbed_official 402:09075a3b15e3 72 if ((obj->i2c == I2C_2) && !i2c2_inited) {
mbed_official 305:1f0269907d8b 73 i2c2_inited = 1;
mbed_official 219:993c9b0acbcc 74 __I2C2_CLK_ENABLE();
mbed_official 402:09075a3b15e3 75 // Configure I2C pins
mbed_official 402:09075a3b15e3 76 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 402:09075a3b15e3 77 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 402:09075a3b15e3 78 pin_mode(sda, OpenDrain);
mbed_official 402:09075a3b15e3 79 pin_mode(scl, OpenDrain);
mbed_official 305:1f0269907d8b 80 }
mbed_official 219:993c9b0acbcc 81
mbed_official 219:993c9b0acbcc 82 // Reset to clear pending flags if any
mbed_official 219:993c9b0acbcc 83 i2c_reset(obj);
mbed_official 219:993c9b0acbcc 84
mbed_official 219:993c9b0acbcc 85 // I2C configuration
mbed_official 219:993c9b0acbcc 86 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 219:993c9b0acbcc 87 }
mbed_official 219:993c9b0acbcc 88
mbed_official 402:09075a3b15e3 89 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 402:09075a3b15e3 90 {
mbed_official 239:8cadf13dff33 91 MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
mbed_official 305:1f0269907d8b 92 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 305:1f0269907d8b 93 int timeout;
mbed_official 239:8cadf13dff33 94
mbed_official 305:1f0269907d8b 95 // wait before init
mbed_official 305:1f0269907d8b 96 timeout = LONG_TIMEOUT;
mbed_official 402:09075a3b15e3 97 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 219:993c9b0acbcc 98
mbed_official 219:993c9b0acbcc 99 // Common settings: I2C clock = 48 MHz, Analog filter = ON, Digital filter coefficient = 0
mbed_official 219:993c9b0acbcc 100 switch (hz) {
mbed_official 219:993c9b0acbcc 101 case 100000:
mbed_official 219:993c9b0acbcc 102 I2cHandle.Init.Timing = 0x10805E89; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
mbed_official 219:993c9b0acbcc 103 break;
mbed_official 219:993c9b0acbcc 104 case 400000:
mbed_official 219:993c9b0acbcc 105 I2cHandle.Init.Timing = 0x00901850; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
mbed_official 219:993c9b0acbcc 106 break;
mbed_official 219:993c9b0acbcc 107 case 1000000:
mbed_official 219:993c9b0acbcc 108 I2cHandle.Init.Timing = 0x00700818; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
mbed_official 219:993c9b0acbcc 109 break;
mbed_official 219:993c9b0acbcc 110 default:
mbed_official 219:993c9b0acbcc 111 break;
mbed_official 219:993c9b0acbcc 112 }
mbed_official 219:993c9b0acbcc 113
mbed_official 219:993c9b0acbcc 114 // I2C configuration
mbed_official 219:993c9b0acbcc 115 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 219:993c9b0acbcc 116 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 219:993c9b0acbcc 117 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 219:993c9b0acbcc 118 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 219:993c9b0acbcc 119 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 219:993c9b0acbcc 120 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 219:993c9b0acbcc 121 I2cHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
mbed_official 219:993c9b0acbcc 122 HAL_I2C_Init(&I2cHandle);
mbed_official 219:993c9b0acbcc 123 }
mbed_official 219:993c9b0acbcc 124
mbed_official 402:09075a3b15e3 125 inline int i2c_start(i2c_t *obj)
mbed_official 402:09075a3b15e3 126 {
mbed_official 219:993c9b0acbcc 127 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 128 int timeout;
mbed_official 219:993c9b0acbcc 129
mbed_official 219:993c9b0acbcc 130 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 131
mbed_official 219:993c9b0acbcc 132 // Clear Acknowledge failure flag
mbed_official 219:993c9b0acbcc 133 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 219:993c9b0acbcc 134
mbed_official 219:993c9b0acbcc 135 // Generate the START condition
mbed_official 219:993c9b0acbcc 136 i2c->CR2 |= I2C_CR2_START;
mbed_official 219:993c9b0acbcc 137
mbed_official 219:993c9b0acbcc 138 // Wait the START condition has been correctly sent
mbed_official 219:993c9b0acbcc 139 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 140 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == RESET) {
mbed_official 219:993c9b0acbcc 141 if ((timeout--) == 0) {
mbed_official 219:993c9b0acbcc 142 return 1;
mbed_official 219:993c9b0acbcc 143 }
mbed_official 219:993c9b0acbcc 144 }
mbed_official 219:993c9b0acbcc 145
mbed_official 219:993c9b0acbcc 146 return 0;
mbed_official 219:993c9b0acbcc 147 }
mbed_official 219:993c9b0acbcc 148
mbed_official 402:09075a3b15e3 149 inline int i2c_stop(i2c_t *obj)
mbed_official 402:09075a3b15e3 150 {
mbed_official 219:993c9b0acbcc 151 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 152
mbed_official 219:993c9b0acbcc 153 // Generate the STOP condition
mbed_official 219:993c9b0acbcc 154 i2c->CR2 |= I2C_CR2_STOP;
mbed_official 219:993c9b0acbcc 155
mbed_official 219:993c9b0acbcc 156 return 0;
mbed_official 219:993c9b0acbcc 157 }
mbed_official 219:993c9b0acbcc 158
mbed_official 402:09075a3b15e3 159 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 402:09075a3b15e3 160 {
mbed_official 219:993c9b0acbcc 161 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 162 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 163 int timeout;
mbed_official 219:993c9b0acbcc 164 int count;
mbed_official 219:993c9b0acbcc 165 int value;
mbed_official 219:993c9b0acbcc 166
mbed_official 404:cbc7dfcb0ce9 167 // Update CR2 register
mbed_official 219:993c9b0acbcc 168 i2c->CR2 = (i2c->CR2 & (uint32_t)~((uint32_t)(I2C_CR2_SADD | I2C_CR2_NBYTES | I2C_CR2_RELOAD | I2C_CR2_AUTOEND | I2C_CR2_RD_WRN | I2C_CR2_START | I2C_CR2_STOP)))
mbed_official 219:993c9b0acbcc 169 | (uint32_t)(((uint32_t)address & I2C_CR2_SADD) | (((uint32_t)length << 16) & I2C_CR2_NBYTES) | (uint32_t)I2C_SOFTEND_MODE | (uint32_t)I2C_GENERATE_START_READ);
mbed_official 219:993c9b0acbcc 170
mbed_official 219:993c9b0acbcc 171 // Read all bytes
mbed_official 219:993c9b0acbcc 172 for (count = 0; count < length; count++) {
mbed_official 219:993c9b0acbcc 173 value = i2c_byte_read(obj, 0);
mbed_official 219:993c9b0acbcc 174 data[count] = (char)value;
mbed_official 219:993c9b0acbcc 175 }
mbed_official 219:993c9b0acbcc 176
mbed_official 219:993c9b0acbcc 177 // Wait transfer complete
mbed_official 219:993c9b0acbcc 178 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 179 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 219:993c9b0acbcc 180 timeout--;
mbed_official 219:993c9b0acbcc 181 if (timeout == 0) {
mbed_official 247:135e3186a638 182 return -1;
mbed_official 219:993c9b0acbcc 183 }
mbed_official 219:993c9b0acbcc 184 }
mbed_official 219:993c9b0acbcc 185 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 219:993c9b0acbcc 186
mbed_official 219:993c9b0acbcc 187 // If not repeated start, send stop.
mbed_official 219:993c9b0acbcc 188 if (stop) {
mbed_official 219:993c9b0acbcc 189 i2c_stop(obj);
mbed_official 404:cbc7dfcb0ce9 190 // Wait until STOPF flag is set
mbed_official 219:993c9b0acbcc 191 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 192 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 219:993c9b0acbcc 193 timeout--;
mbed_official 219:993c9b0acbcc 194 if (timeout == 0) {
mbed_official 247:135e3186a638 195 return -1;
mbed_official 219:993c9b0acbcc 196 }
mbed_official 219:993c9b0acbcc 197 }
mbed_official 404:cbc7dfcb0ce9 198 // Clear STOP Flag
mbed_official 219:993c9b0acbcc 199 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 219:993c9b0acbcc 200 }
mbed_official 219:993c9b0acbcc 201
mbed_official 219:993c9b0acbcc 202 return length;
mbed_official 219:993c9b0acbcc 203 }
mbed_official 219:993c9b0acbcc 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 219:993c9b0acbcc 207 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 208 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 209 int timeout;
mbed_official 219:993c9b0acbcc 210 int count;
mbed_official 219:993c9b0acbcc 211
mbed_official 404:cbc7dfcb0ce9 212 // Update CR2 register
mbed_official 219:993c9b0acbcc 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 219:993c9b0acbcc 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 219:993c9b0acbcc 215
mbed_official 219:993c9b0acbcc 216 for (count = 0; count < length; count++) {
mbed_official 219:993c9b0acbcc 217 i2c_byte_write(obj, data[count]);
mbed_official 219:993c9b0acbcc 218 }
mbed_official 219:993c9b0acbcc 219
mbed_official 219:993c9b0acbcc 220 // Wait transfer complete
mbed_official 219:993c9b0acbcc 221 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 222 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TC) == RESET) {
mbed_official 219:993c9b0acbcc 223 timeout--;
mbed_official 219:993c9b0acbcc 224 if (timeout == 0) {
mbed_official 247:135e3186a638 225 return -1;
mbed_official 219:993c9b0acbcc 226 }
mbed_official 219:993c9b0acbcc 227 }
mbed_official 219:993c9b0acbcc 228 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_TC);
mbed_official 219:993c9b0acbcc 229
mbed_official 404:cbc7dfcb0ce9 230 // If not repeated start, send stop
mbed_official 219:993c9b0acbcc 231 if (stop) {
mbed_official 219:993c9b0acbcc 232 i2c_stop(obj);
mbed_official 404:cbc7dfcb0ce9 233 // Wait until STOPF flag is set
mbed_official 219:993c9b0acbcc 234 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 235 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 219:993c9b0acbcc 236 timeout--;
mbed_official 219:993c9b0acbcc 237 if (timeout == 0) {
mbed_official 247:135e3186a638 238 return -1;
mbed_official 219:993c9b0acbcc 239 }
mbed_official 219:993c9b0acbcc 240 }
mbed_official 404:cbc7dfcb0ce9 241 // Clear STOP Flag
mbed_official 219:993c9b0acbcc 242 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_STOPF);
mbed_official 219:993c9b0acbcc 243 }
mbed_official 219:993c9b0acbcc 244
mbed_official 219:993c9b0acbcc 245 return count;
mbed_official 219:993c9b0acbcc 246 }
mbed_official 219:993c9b0acbcc 247
mbed_official 402:09075a3b15e3 248 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 402:09075a3b15e3 249 {
mbed_official 219:993c9b0acbcc 250 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 251 int timeout;
mbed_official 219:993c9b0acbcc 252
mbed_official 219:993c9b0acbcc 253 // Wait until the byte is received
mbed_official 219:993c9b0acbcc 254 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 255 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 219:993c9b0acbcc 256 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 257 return -1;
mbed_official 219:993c9b0acbcc 258 }
mbed_official 219:993c9b0acbcc 259 }
mbed_official 219:993c9b0acbcc 260
mbed_official 219:993c9b0acbcc 261 return (int)i2c->RXDR;
mbed_official 219:993c9b0acbcc 262 }
mbed_official 219:993c9b0acbcc 263
mbed_official 402:09075a3b15e3 264 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 402:09075a3b15e3 265 {
mbed_official 219:993c9b0acbcc 266 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 267 int timeout;
mbed_official 219:993c9b0acbcc 268
mbed_official 219:993c9b0acbcc 269 // Wait until the previous byte is transmitted
mbed_official 219:993c9b0acbcc 270 timeout = FLAG_TIMEOUT;
mbed_official 219:993c9b0acbcc 271 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXIS) == RESET) {
mbed_official 219:993c9b0acbcc 272 if ((timeout--) == 0) {
mbed_official 219:993c9b0acbcc 273 return 0;
mbed_official 219:993c9b0acbcc 274 }
mbed_official 219:993c9b0acbcc 275 }
mbed_official 219:993c9b0acbcc 276
mbed_official 219:993c9b0acbcc 277 i2c->TXDR = (uint8_t)data;
mbed_official 219:993c9b0acbcc 278
mbed_official 219:993c9b0acbcc 279 return 1;
mbed_official 219:993c9b0acbcc 280 }
mbed_official 219:993c9b0acbcc 281
mbed_official 402:09075a3b15e3 282 void i2c_reset(i2c_t *obj)
mbed_official 402:09075a3b15e3 283 {
mbed_official 305:1f0269907d8b 284 int timeout;
mbed_official 402:09075a3b15e3 285
mbed_official 404:cbc7dfcb0ce9 286 // Wait before reset
mbed_official 305:1f0269907d8b 287 timeout = LONG_TIMEOUT;
mbed_official 402:09075a3b15e3 288 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 305:1f0269907d8b 289
mbed_official 219:993c9b0acbcc 290 if (obj->i2c == I2C_1) {
mbed_official 219:993c9b0acbcc 291 __I2C1_FORCE_RESET();
mbed_official 219:993c9b0acbcc 292 __I2C1_RELEASE_RESET();
mbed_official 219:993c9b0acbcc 293 }
mbed_official 219:993c9b0acbcc 294 if (obj->i2c == I2C_2) {
mbed_official 219:993c9b0acbcc 295 __I2C2_FORCE_RESET();
mbed_official 219:993c9b0acbcc 296 __I2C2_RELEASE_RESET();
mbed_official 219:993c9b0acbcc 297 }
mbed_official 219:993c9b0acbcc 298 }
mbed_official 219:993c9b0acbcc 299
mbed_official 219:993c9b0acbcc 300 #if DEVICE_I2CSLAVE
mbed_official 219:993c9b0acbcc 301
mbed_official 402:09075a3b15e3 302 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 402:09075a3b15e3 303 {
mbed_official 219:993c9b0acbcc 304 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 305 uint16_t tmpreg = 0;
mbed_official 219:993c9b0acbcc 306
mbed_official 219:993c9b0acbcc 307 // disable
mbed_official 219:993c9b0acbcc 308 i2c->OAR1 &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 219:993c9b0acbcc 309 // Get the old register value
mbed_official 219:993c9b0acbcc 310 tmpreg = i2c->OAR1;
mbed_official 219:993c9b0acbcc 311 // Reset address bits
mbed_official 219:993c9b0acbcc 312 tmpreg &= 0xFC00;
mbed_official 219:993c9b0acbcc 313 // Set new address
mbed_official 219:993c9b0acbcc 314 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 219:993c9b0acbcc 315 // Store the new register value
mbed_official 219:993c9b0acbcc 316 i2c->OAR1 = tmpreg;
mbed_official 219:993c9b0acbcc 317 // enable
mbed_official 219:993c9b0acbcc 318 i2c->OAR1 |= I2C_OAR1_OA1EN;
mbed_official 219:993c9b0acbcc 319 }
mbed_official 219:993c9b0acbcc 320
mbed_official 402:09075a3b15e3 321 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 402:09075a3b15e3 322 {
mbed_official 219:993c9b0acbcc 323 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 324 uint16_t tmpreg;
mbed_official 219:993c9b0acbcc 325
mbed_official 219:993c9b0acbcc 326 // Get the old register value
mbed_official 219:993c9b0acbcc 327 tmpreg = i2c->OAR1;
mbed_official 219:993c9b0acbcc 328
mbed_official 219:993c9b0acbcc 329 // Enable / disable slave
mbed_official 219:993c9b0acbcc 330 if (enable_slave == 1) {
mbed_official 219:993c9b0acbcc 331 tmpreg |= I2C_OAR1_OA1EN;
mbed_official 219:993c9b0acbcc 332 } else {
mbed_official 219:993c9b0acbcc 333 tmpreg &= (uint32_t)(~I2C_OAR1_OA1EN);
mbed_official 219:993c9b0acbcc 334 }
mbed_official 219:993c9b0acbcc 335
mbed_official 219:993c9b0acbcc 336 // Set new mode
mbed_official 219:993c9b0acbcc 337 i2c->OAR1 = tmpreg;
mbed_official 219:993c9b0acbcc 338 }
mbed_official 219:993c9b0acbcc 339
mbed_official 219:993c9b0acbcc 340 // See I2CSlave.h
mbed_official 219:993c9b0acbcc 341 #define NoData 0 // the slave has not been addressed
mbed_official 219:993c9b0acbcc 342 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 219:993c9b0acbcc 343 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 219:993c9b0acbcc 344 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 219:993c9b0acbcc 345
mbed_official 402:09075a3b15e3 346 int i2c_slave_receive(i2c_t *obj)
mbed_official 402:09075a3b15e3 347 {
mbed_official 219:993c9b0acbcc 348 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 349 int retValue = NoData;
mbed_official 219:993c9b0acbcc 350
mbed_official 219:993c9b0acbcc 351 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 219:993c9b0acbcc 352 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 219:993c9b0acbcc 353 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_DIR) == 1)
mbed_official 219:993c9b0acbcc 354 retValue = ReadAddressed;
mbed_official 219:993c9b0acbcc 355 else
mbed_official 219:993c9b0acbcc 356 retValue = WriteAddressed;
mbed_official 219:993c9b0acbcc 357
mbed_official 219:993c9b0acbcc 358 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 219:993c9b0acbcc 359 }
mbed_official 219:993c9b0acbcc 360 }
mbed_official 219:993c9b0acbcc 361
mbed_official 219:993c9b0acbcc 362 return (retValue);
mbed_official 219:993c9b0acbcc 363 }
mbed_official 219:993c9b0acbcc 364
mbed_official 402:09075a3b15e3 365 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 402:09075a3b15e3 366 {
mbed_official 219:993c9b0acbcc 367 char size = 0;
mbed_official 219:993c9b0acbcc 368
mbed_official 219:993c9b0acbcc 369 while (size < length) data[size++] = (char)i2c_byte_read(obj, 0);
mbed_official 219:993c9b0acbcc 370
mbed_official 219:993c9b0acbcc 371 return size;
mbed_official 219:993c9b0acbcc 372 }
mbed_official 219:993c9b0acbcc 373
mbed_official 402:09075a3b15e3 374 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 402:09075a3b15e3 375 {
mbed_official 219:993c9b0acbcc 376 char size = 0;
mbed_official 219:993c9b0acbcc 377 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 219:993c9b0acbcc 378
mbed_official 219:993c9b0acbcc 379 do {
mbed_official 219:993c9b0acbcc 380 i2c_byte_write(obj, data[size]);
mbed_official 219:993c9b0acbcc 381 size++;
mbed_official 219:993c9b0acbcc 382 } while (size < length);
mbed_official 219:993c9b0acbcc 383
mbed_official 219:993c9b0acbcc 384 return size;
mbed_official 219:993c9b0acbcc 385 }
mbed_official 219:993c9b0acbcc 386
mbed_official 219:993c9b0acbcc 387
mbed_official 219:993c9b0acbcc 388 #endif // DEVICE_I2CSLAVE
mbed_official 219:993c9b0acbcc 389
mbed_official 219:993c9b0acbcc 390 #endif // DEVICE_I2C