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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_F411RE/i2c_api.c@268:402bcc0c870b, 2014-07-29 (annotated)

Committer:
mbed_official
Date:
Tue Jul 29 19:00:07 2014 +0100
Revision:
268:402bcc0c870b
Parent:
247:135e3186a638
Child:
305:1f0269907d8b
Synchronized with git revision 490d1a6606b3138f165c5edf2f2370ca616587c0



Full URL: https://github.com/mbedmicro/mbed/commit/490d1a6606b3138f165c5edf2f2370ca616587c0/



[LPC1114] Sleep fix + some device.h settings

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 235:685d5f11838f 1 /* mbed Microcontroller Library
mbed_official 235:685d5f11838f 2 *******************************************************************************
mbed_official 235:685d5f11838f 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 235:685d5f11838f 4 * All rights reserved.
mbed_official 235:685d5f11838f 5 *
mbed_official 235:685d5f11838f 6 * Redistribution and use in source and binary forms, with or without
mbed_official 235:685d5f11838f 7 * modification, are permitted provided that the following conditions are met:
mbed_official 235:685d5f11838f 8 *
mbed_official 235:685d5f11838f 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 235:685d5f11838f 10 * this list of conditions and the following disclaimer.
mbed_official 235:685d5f11838f 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 235:685d5f11838f 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 235:685d5f11838f 13 * and/or other materials provided with the distribution.
mbed_official 235:685d5f11838f 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 235:685d5f11838f 15 * may be used to endorse or promote products derived from this software
mbed_official 235:685d5f11838f 16 * without specific prior written permission.
mbed_official 235:685d5f11838f 17 *
mbed_official 235:685d5f11838f 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 235:685d5f11838f 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 235:685d5f11838f 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 235:685d5f11838f 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 235:685d5f11838f 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 235:685d5f11838f 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 235:685d5f11838f 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 235:685d5f11838f 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 235:685d5f11838f 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 235:685d5f11838f 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 235:685d5f11838f 28 *******************************************************************************
mbed_official 235:685d5f11838f 29 */
mbed_official 235:685d5f11838f 30 #include "mbed_assert.h"
mbed_official 235:685d5f11838f 31 #include "i2c_api.h"
mbed_official 235:685d5f11838f 32
mbed_official 235:685d5f11838f 33 #if DEVICE_I2C
mbed_official 235:685d5f11838f 34
mbed_official 235:685d5f11838f 35 #include "cmsis.h"
mbed_official 235:685d5f11838f 36 #include "pinmap.h"
mbed_official 235:685d5f11838f 37
mbed_official 235:685d5f11838f 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 235:685d5f11838f 39 not based on accurate values, they just guarantee that the application will
mbed_official 235:685d5f11838f 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 235:685d5f11838f 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 235:685d5f11838f 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 235:685d5f11838f 43
mbed_official 235:685d5f11838f 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 235:685d5f11838f 45 {PB_3, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF9_I2C2)},
mbed_official 235:685d5f11838f 46 {PB_4, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF9_I2C3)},
mbed_official 235:685d5f11838f 47 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 235:685d5f11838f 48 // {PB_8, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF9_I2C3)}, // Warning: also on SCL
mbed_official 235:685d5f11838f 49 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, // ARDUINO
mbed_official 235:685d5f11838f 50 // {PB_9, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF9_I2C2)},
mbed_official 235:685d5f11838f 51 {PC_9, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
mbed_official 235:685d5f11838f 52 {NC, NC, 0}
mbed_official 235:685d5f11838f 53 };
mbed_official 235:685d5f11838f 54
mbed_official 235:685d5f11838f 55 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 235:685d5f11838f 56 {PA_8, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
mbed_official 235:685d5f11838f 57 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 235:685d5f11838f 58 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)}, // ARDUINO
mbed_official 235:685d5f11838f 59 {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 235:685d5f11838f 60 {NC, NC, 0}
mbed_official 235:685d5f11838f 61 };
mbed_official 235:685d5f11838f 62
mbed_official 235:685d5f11838f 63 I2C_HandleTypeDef I2cHandle;
mbed_official 235:685d5f11838f 64
mbed_official 235:685d5f11838f 65 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
mbed_official 235:685d5f11838f 66 {
mbed_official 235:685d5f11838f 67 // Determine the I2C to use
mbed_official 235:685d5f11838f 68 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 235:685d5f11838f 69 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 235:685d5f11838f 70
mbed_official 235:685d5f11838f 71 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 235:685d5f11838f 72 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 235:685d5f11838f 73
mbed_official 235:685d5f11838f 74 // Enable I2C clock
mbed_official 235:685d5f11838f 75 if (obj->i2c == I2C_1) {
mbed_official 235:685d5f11838f 76 __I2C1_CLK_ENABLE();
mbed_official 235:685d5f11838f 77 }
mbed_official 235:685d5f11838f 78 if (obj->i2c == I2C_2) {
mbed_official 235:685d5f11838f 79 __I2C2_CLK_ENABLE();
mbed_official 235:685d5f11838f 80 }
mbed_official 235:685d5f11838f 81 if (obj->i2c == I2C_3) {
mbed_official 235:685d5f11838f 82 __I2C3_CLK_ENABLE();
mbed_official 235:685d5f11838f 83 }
mbed_official 235:685d5f11838f 84
mbed_official 235:685d5f11838f 85 // Configure I2C pins
mbed_official 235:685d5f11838f 86 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 235:685d5f11838f 87 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 235:685d5f11838f 88 pin_mode(sda, OpenDrain);
mbed_official 235:685d5f11838f 89 pin_mode(scl, OpenDrain);
mbed_official 235:685d5f11838f 90
mbed_official 235:685d5f11838f 91 // Reset to clear pending flags if any
mbed_official 235:685d5f11838f 92 i2c_reset(obj);
mbed_official 235:685d5f11838f 93
mbed_official 235:685d5f11838f 94 // I2C configuration
mbed_official 235:685d5f11838f 95 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 235:685d5f11838f 96
mbed_official 235:685d5f11838f 97 // I2C master by default
mbed_official 235:685d5f11838f 98 obj->slave = 0;
mbed_official 235:685d5f11838f 99 }
mbed_official 235:685d5f11838f 100
mbed_official 235:685d5f11838f 101 void i2c_frequency(i2c_t *obj, int hz)
mbed_official 235:685d5f11838f 102 {
mbed_official 235:685d5f11838f 103 MBED_ASSERT((hz != 0) && (hz <= 400000));
mbed_official 235:685d5f11838f 104 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 105
mbed_official 235:685d5f11838f 106 // I2C configuration
mbed_official 235:685d5f11838f 107 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 235:685d5f11838f 108 I2cHandle.Init.ClockSpeed = hz;
mbed_official 235:685d5f11838f 109 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 235:685d5f11838f 110 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
mbed_official 235:685d5f11838f 111 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 235:685d5f11838f 112 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 235:685d5f11838f 113 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 235:685d5f11838f 114 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 235:685d5f11838f 115 HAL_I2C_Init(&I2cHandle);
mbed_official 235:685d5f11838f 116 if (obj->slave) {
mbed_official 235:685d5f11838f 117 /* Enable Address Acknowledge */
mbed_official 235:685d5f11838f 118 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 235:685d5f11838f 119 }
mbed_official 235:685d5f11838f 120
mbed_official 235:685d5f11838f 121 }
mbed_official 235:685d5f11838f 122
mbed_official 235:685d5f11838f 123 inline int i2c_start(i2c_t *obj)
mbed_official 235:685d5f11838f 124 {
mbed_official 235:685d5f11838f 125 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 126 int timeout;
mbed_official 235:685d5f11838f 127
mbed_official 235:685d5f11838f 128 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 129
mbed_official 235:685d5f11838f 130 // Clear Acknowledge failure flag
mbed_official 235:685d5f11838f 131 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 235:685d5f11838f 132
mbed_official 235:685d5f11838f 133 // Generate the START condition
mbed_official 235:685d5f11838f 134 i2c->CR1 |= I2C_CR1_START;
mbed_official 235:685d5f11838f 135
mbed_official 235:685d5f11838f 136 // Wait the START condition has been correctly sent
mbed_official 235:685d5f11838f 137 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 138 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 235:685d5f11838f 139 if ((timeout--) == 0) {
mbed_official 235:685d5f11838f 140 return 1;
mbed_official 235:685d5f11838f 141 }
mbed_official 235:685d5f11838f 142 }
mbed_official 235:685d5f11838f 143
mbed_official 235:685d5f11838f 144 return 0;
mbed_official 235:685d5f11838f 145 }
mbed_official 235:685d5f11838f 146
mbed_official 235:685d5f11838f 147 inline int i2c_stop(i2c_t *obj)
mbed_official 235:685d5f11838f 148 {
mbed_official 235:685d5f11838f 149 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 150
mbed_official 235:685d5f11838f 151 // Generate the STOP condition
mbed_official 235:685d5f11838f 152 i2c->CR1 |= I2C_CR1_STOP;
mbed_official 235:685d5f11838f 153
mbed_official 235:685d5f11838f 154 return 0;
mbed_official 235:685d5f11838f 155 }
mbed_official 235:685d5f11838f 156
mbed_official 235:685d5f11838f 157 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
mbed_official 235:685d5f11838f 158 {
mbed_official 235:685d5f11838f 159 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 160 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 161 int timeout;
mbed_official 235:685d5f11838f 162 int count;
mbed_official 235:685d5f11838f 163 int value;
mbed_official 235:685d5f11838f 164
mbed_official 235:685d5f11838f 165 i2c_start(obj);
mbed_official 235:685d5f11838f 166
mbed_official 235:685d5f11838f 167 // Wait until SB flag is set
mbed_official 235:685d5f11838f 168 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 169 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 235:685d5f11838f 170 timeout--;
mbed_official 235:685d5f11838f 171 if (timeout == 0) {
mbed_official 247:135e3186a638 172 return -1;
mbed_official 235:685d5f11838f 173 }
mbed_official 235:685d5f11838f 174 }
mbed_official 235:685d5f11838f 175
mbed_official 235:685d5f11838f 176 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
mbed_official 235:685d5f11838f 177
mbed_official 235:685d5f11838f 178
mbed_official 235:685d5f11838f 179 // Wait address is acknowledged
mbed_official 235:685d5f11838f 180 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 181 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 235:685d5f11838f 182 timeout--;
mbed_official 235:685d5f11838f 183 if (timeout == 0) {
mbed_official 247:135e3186a638 184 return -1;
mbed_official 235:685d5f11838f 185 }
mbed_official 235:685d5f11838f 186 }
mbed_official 235:685d5f11838f 187 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 235:685d5f11838f 188
mbed_official 235:685d5f11838f 189 // Read all bytes except last one
mbed_official 235:685d5f11838f 190 for (count = 0; count < (length - 1); count++) {
mbed_official 235:685d5f11838f 191 value = i2c_byte_read(obj, 0);
mbed_official 235:685d5f11838f 192 data[count] = (char)value;
mbed_official 235:685d5f11838f 193 }
mbed_official 235:685d5f11838f 194
mbed_official 235:685d5f11838f 195 // If not repeated start, send stop.
mbed_official 235:685d5f11838f 196 // Warning: must be done BEFORE the data is read.
mbed_official 235:685d5f11838f 197 if (stop) {
mbed_official 235:685d5f11838f 198 i2c_stop(obj);
mbed_official 235:685d5f11838f 199 }
mbed_official 235:685d5f11838f 200
mbed_official 235:685d5f11838f 201 // Read the last byte
mbed_official 235:685d5f11838f 202 value = i2c_byte_read(obj, 1);
mbed_official 235:685d5f11838f 203 data[count] = (char)value;
mbed_official 235:685d5f11838f 204
mbed_official 235:685d5f11838f 205 return length;
mbed_official 235:685d5f11838f 206 }
mbed_official 235:685d5f11838f 207
mbed_official 235:685d5f11838f 208 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
mbed_official 235:685d5f11838f 209 {
mbed_official 235:685d5f11838f 210 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 211 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 212 int timeout;
mbed_official 235:685d5f11838f 213 int count;
mbed_official 235:685d5f11838f 214
mbed_official 235:685d5f11838f 215 i2c_start(obj);
mbed_official 235:685d5f11838f 216
mbed_official 235:685d5f11838f 217 // Wait until SB flag is set
mbed_official 235:685d5f11838f 218 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 219 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 235:685d5f11838f 220 timeout--;
mbed_official 235:685d5f11838f 221 if (timeout == 0) {
mbed_official 247:135e3186a638 222 return -1;
mbed_official 235:685d5f11838f 223 }
mbed_official 235:685d5f11838f 224 }
mbed_official 235:685d5f11838f 225
mbed_official 235:685d5f11838f 226 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
mbed_official 235:685d5f11838f 227
mbed_official 235:685d5f11838f 228
mbed_official 235:685d5f11838f 229 // Wait address is acknowledged
mbed_official 235:685d5f11838f 230 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 231 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 235:685d5f11838f 232 timeout--;
mbed_official 235:685d5f11838f 233 if (timeout == 0) {
mbed_official 247:135e3186a638 234 return -1;
mbed_official 235:685d5f11838f 235 }
mbed_official 235:685d5f11838f 236 }
mbed_official 235:685d5f11838f 237 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 235:685d5f11838f 238
mbed_official 235:685d5f11838f 239 for (count = 0; count < length; count++) {
mbed_official 235:685d5f11838f 240 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 235:685d5f11838f 241 i2c_stop(obj);
mbed_official 247:135e3186a638 242 return -1;
mbed_official 235:685d5f11838f 243 }
mbed_official 235:685d5f11838f 244 }
mbed_official 235:685d5f11838f 245
mbed_official 235:685d5f11838f 246 // If not repeated start, send stop.
mbed_official 235:685d5f11838f 247 if (stop) {
mbed_official 235:685d5f11838f 248 i2c_stop(obj);
mbed_official 235:685d5f11838f 249 }
mbed_official 235:685d5f11838f 250
mbed_official 235:685d5f11838f 251 return count;
mbed_official 235:685d5f11838f 252 }
mbed_official 235:685d5f11838f 253
mbed_official 235:685d5f11838f 254 int i2c_byte_read(i2c_t *obj, int last)
mbed_official 235:685d5f11838f 255 {
mbed_official 235:685d5f11838f 256 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 257 int timeout;
mbed_official 235:685d5f11838f 258
mbed_official 235:685d5f11838f 259 if (last) {
mbed_official 235:685d5f11838f 260 // Don't acknowledge the last byte
mbed_official 235:685d5f11838f 261 i2c->CR1 &= ~I2C_CR1_ACK;
mbed_official 235:685d5f11838f 262 } else {
mbed_official 235:685d5f11838f 263 // Acknowledge the byte
mbed_official 235:685d5f11838f 264 i2c->CR1 |= I2C_CR1_ACK;
mbed_official 235:685d5f11838f 265 }
mbed_official 235:685d5f11838f 266
mbed_official 235:685d5f11838f 267 // Wait until the byte is received
mbed_official 235:685d5f11838f 268 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 269 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 235:685d5f11838f 270 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 271 return -1;
mbed_official 235:685d5f11838f 272 }
mbed_official 235:685d5f11838f 273 }
mbed_official 235:685d5f11838f 274
mbed_official 235:685d5f11838f 275 return (int)i2c->DR;
mbed_official 235:685d5f11838f 276 }
mbed_official 235:685d5f11838f 277
mbed_official 235:685d5f11838f 278 int i2c_byte_write(i2c_t *obj, int data)
mbed_official 235:685d5f11838f 279 {
mbed_official 235:685d5f11838f 280 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 281 int timeout;
mbed_official 235:685d5f11838f 282
mbed_official 235:685d5f11838f 283 i2c->DR = (uint8_t)data;
mbed_official 235:685d5f11838f 284
mbed_official 235:685d5f11838f 285 // Wait until the byte is transmitted
mbed_official 235:685d5f11838f 286 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 287 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
mbed_official 235:685d5f11838f 288 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
mbed_official 235:685d5f11838f 289 if ((timeout--) == 0) {
mbed_official 235:685d5f11838f 290 return 0;
mbed_official 235:685d5f11838f 291 }
mbed_official 235:685d5f11838f 292 }
mbed_official 235:685d5f11838f 293
mbed_official 235:685d5f11838f 294 return 1;
mbed_official 235:685d5f11838f 295 }
mbed_official 235:685d5f11838f 296
mbed_official 235:685d5f11838f 297 void i2c_reset(i2c_t *obj)
mbed_official 235:685d5f11838f 298 {
mbed_official 235:685d5f11838f 299 if (obj->i2c == I2C_1) {
mbed_official 235:685d5f11838f 300 __I2C1_FORCE_RESET();
mbed_official 235:685d5f11838f 301 __I2C1_RELEASE_RESET();
mbed_official 235:685d5f11838f 302 }
mbed_official 235:685d5f11838f 303 if (obj->i2c == I2C_2) {
mbed_official 235:685d5f11838f 304 __I2C2_FORCE_RESET();
mbed_official 235:685d5f11838f 305 __I2C2_RELEASE_RESET();
mbed_official 235:685d5f11838f 306 }
mbed_official 235:685d5f11838f 307 if (obj->i2c == I2C_3) {
mbed_official 235:685d5f11838f 308 __I2C3_FORCE_RESET();
mbed_official 235:685d5f11838f 309 __I2C3_RELEASE_RESET();
mbed_official 235:685d5f11838f 310 }
mbed_official 235:685d5f11838f 311 }
mbed_official 235:685d5f11838f 312
mbed_official 235:685d5f11838f 313 #if DEVICE_I2CSLAVE
mbed_official 235:685d5f11838f 314
mbed_official 235:685d5f11838f 315 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
mbed_official 235:685d5f11838f 316 {
mbed_official 235:685d5f11838f 317 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 318 uint16_t tmpreg = 0;
mbed_official 235:685d5f11838f 319
mbed_official 235:685d5f11838f 320 // Get the old register value
mbed_official 235:685d5f11838f 321 tmpreg = i2c->OAR1;
mbed_official 235:685d5f11838f 322 // Reset address bits
mbed_official 235:685d5f11838f 323 tmpreg &= 0xFC00;
mbed_official 235:685d5f11838f 324 // Set new address
mbed_official 235:685d5f11838f 325 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 235:685d5f11838f 326 // Store the new register value
mbed_official 235:685d5f11838f 327 i2c->OAR1 = tmpreg;
mbed_official 235:685d5f11838f 328 }
mbed_official 235:685d5f11838f 329
mbed_official 235:685d5f11838f 330 void i2c_slave_mode(i2c_t *obj, int enable_slave)
mbed_official 235:685d5f11838f 331 {
mbed_official 235:685d5f11838f 332 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 333 if (enable_slave) {
mbed_official 235:685d5f11838f 334 obj->slave = 1;
mbed_official 235:685d5f11838f 335 /* Enable Address Acknowledge */
mbed_official 235:685d5f11838f 336 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 235:685d5f11838f 337 }
mbed_official 235:685d5f11838f 338 }
mbed_official 235:685d5f11838f 339
mbed_official 235:685d5f11838f 340 // See I2CSlave.h
mbed_official 235:685d5f11838f 341 #define NoData 0 // the slave has not been addressed
mbed_official 235:685d5f11838f 342 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 235:685d5f11838f 343 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 235:685d5f11838f 344 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 235:685d5f11838f 345
mbed_official 235:685d5f11838f 346 int i2c_slave_receive(i2c_t *obj)
mbed_official 235:685d5f11838f 347 {
mbed_official 235:685d5f11838f 348 int retValue = NoData;
mbed_official 235:685d5f11838f 349
mbed_official 235:685d5f11838f 350 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 235:685d5f11838f 351 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 235:685d5f11838f 352 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1)
mbed_official 235:685d5f11838f 353 retValue = ReadAddressed;
mbed_official 235:685d5f11838f 354 else
mbed_official 235:685d5f11838f 355 retValue = WriteAddressed;
mbed_official 235:685d5f11838f 356
mbed_official 235:685d5f11838f 357 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 235:685d5f11838f 358 }
mbed_official 235:685d5f11838f 359 }
mbed_official 235:685d5f11838f 360
mbed_official 235:685d5f11838f 361 return (retValue);
mbed_official 235:685d5f11838f 362 }
mbed_official 235:685d5f11838f 363
mbed_official 235:685d5f11838f 364 int i2c_slave_read(i2c_t *obj, char *data, int length)
mbed_official 235:685d5f11838f 365 {
mbed_official 235:685d5f11838f 366 uint32_t Timeout;
mbed_official 235:685d5f11838f 367 int size = 0;
mbed_official 235:685d5f11838f 368
mbed_official 235:685d5f11838f 369 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 370
mbed_official 235:685d5f11838f 371 while (length > 0) {
mbed_official 235:685d5f11838f 372 /* Wait until RXNE flag is set */
mbed_official 235:685d5f11838f 373 // Wait until the byte is received
mbed_official 235:685d5f11838f 374 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 375 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 235:685d5f11838f 376 Timeout--;
mbed_official 235:685d5f11838f 377 if (Timeout == 0) {
mbed_official 247:135e3186a638 378 return -1;
mbed_official 235:685d5f11838f 379 }
mbed_official 235:685d5f11838f 380 }
mbed_official 235:685d5f11838f 381
mbed_official 235:685d5f11838f 382 /* Read data from DR */
mbed_official 235:685d5f11838f 383 (*data++) = I2cHandle.Instance->DR;
mbed_official 235:685d5f11838f 384 length--;
mbed_official 235:685d5f11838f 385 size++;
mbed_official 235:685d5f11838f 386
mbed_official 235:685d5f11838f 387 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 235:685d5f11838f 388 /* Read data from DR */
mbed_official 235:685d5f11838f 389 (*data++) = I2cHandle.Instance->DR;
mbed_official 235:685d5f11838f 390 length--;
mbed_official 235:685d5f11838f 391 size++;
mbed_official 235:685d5f11838f 392 }
mbed_official 235:685d5f11838f 393 }
mbed_official 235:685d5f11838f 394
mbed_official 235:685d5f11838f 395 /* Wait until STOP flag is set */
mbed_official 235:685d5f11838f 396 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 397 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 235:685d5f11838f 398 Timeout--;
mbed_official 235:685d5f11838f 399 if (Timeout == 0) {
mbed_official 247:135e3186a638 400 return -1;
mbed_official 235:685d5f11838f 401 }
mbed_official 235:685d5f11838f 402 }
mbed_official 235:685d5f11838f 403
mbed_official 235:685d5f11838f 404 /* Clear STOP flag */
mbed_official 235:685d5f11838f 405 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
mbed_official 235:685d5f11838f 406
mbed_official 235:685d5f11838f 407 /* Wait until BUSY flag is reset */
mbed_official 235:685d5f11838f 408 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 409 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 235:685d5f11838f 410 Timeout--;
mbed_official 235:685d5f11838f 411 if (Timeout == 0) {
mbed_official 247:135e3186a638 412 return -1;
mbed_official 235:685d5f11838f 413 }
mbed_official 235:685d5f11838f 414 }
mbed_official 235:685d5f11838f 415
mbed_official 235:685d5f11838f 416 return size;
mbed_official 235:685d5f11838f 417 }
mbed_official 235:685d5f11838f 418
mbed_official 235:685d5f11838f 419 int i2c_slave_write(i2c_t *obj, const char *data, int length)
mbed_official 235:685d5f11838f 420 {
mbed_official 235:685d5f11838f 421 uint32_t Timeout;
mbed_official 235:685d5f11838f 422 int size = 0;
mbed_official 235:685d5f11838f 423
mbed_official 235:685d5f11838f 424 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 425
mbed_official 235:685d5f11838f 426 while (length > 0) {
mbed_official 235:685d5f11838f 427 /* Wait until TXE flag is set */
mbed_official 235:685d5f11838f 428 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 429 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
mbed_official 235:685d5f11838f 430 Timeout--;
mbed_official 235:685d5f11838f 431 if (Timeout == 0) {
mbed_official 247:135e3186a638 432 return -1;
mbed_official 235:685d5f11838f 433 }
mbed_official 235:685d5f11838f 434 }
mbed_official 235:685d5f11838f 435
mbed_official 235:685d5f11838f 436
mbed_official 235:685d5f11838f 437 /* Write data to DR */
mbed_official 235:685d5f11838f 438 I2cHandle.Instance->DR = (*data++);
mbed_official 235:685d5f11838f 439 length--;
mbed_official 235:685d5f11838f 440 size++;
mbed_official 235:685d5f11838f 441
mbed_official 235:685d5f11838f 442 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 235:685d5f11838f 443 /* Write data to DR */
mbed_official 235:685d5f11838f 444 I2cHandle.Instance->DR = (*data++);
mbed_official 235:685d5f11838f 445 length--;
mbed_official 235:685d5f11838f 446 size++;
mbed_official 235:685d5f11838f 447 }
mbed_official 235:685d5f11838f 448 }
mbed_official 235:685d5f11838f 449
mbed_official 235:685d5f11838f 450 /* Wait until AF flag is set */
mbed_official 235:685d5f11838f 451 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 452 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
mbed_official 235:685d5f11838f 453 Timeout--;
mbed_official 235:685d5f11838f 454 if (Timeout == 0) {
mbed_official 247:135e3186a638 455 return -1;
mbed_official 235:685d5f11838f 456 }
mbed_official 235:685d5f11838f 457 }
mbed_official 235:685d5f11838f 458
mbed_official 235:685d5f11838f 459
mbed_official 235:685d5f11838f 460 /* Clear AF flag */
mbed_official 235:685d5f11838f 461 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 235:685d5f11838f 462
mbed_official 235:685d5f11838f 463
mbed_official 235:685d5f11838f 464 /* Wait until BUSY flag is reset */
mbed_official 235:685d5f11838f 465 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 466 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 235:685d5f11838f 467 Timeout--;
mbed_official 235:685d5f11838f 468 if (Timeout == 0) {
mbed_official 247:135e3186a638 469 return -1;
mbed_official 235:685d5f11838f 470 }
mbed_official 235:685d5f11838f 471 }
mbed_official 235:685d5f11838f 472
mbed_official 235:685d5f11838f 473 I2cHandle.State = HAL_I2C_STATE_READY;
mbed_official 235:685d5f11838f 474
mbed_official 235:685d5f11838f 475 /* Process Unlocked */
mbed_official 235:685d5f11838f 476 __HAL_UNLOCK(&I2cHandle);
mbed_official 235:685d5f11838f 477
mbed_official 235:685d5f11838f 478 return size;
mbed_official 235:685d5f11838f 479 }
mbed_official 235:685d5f11838f 480
mbed_official 235:685d5f11838f 481
mbed_official 235:685d5f11838f 482 #endif // DEVICE_I2CSLAVE
mbed_official 235:685d5f11838f 483
mbed_official 235:685d5f11838f 484 #endif // DEVICE_I2C