Janek Mann / mbed-src-openwear

mbed library sources modified for open wear

Dependents:   openwear-lifelogger-example

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F411RE/i2c_api.c@306:1f0269907d8b, 2014-08-29 (annotated)

Committer:
mbed_official
Date:
Fri Aug 29 20:45:07 2014 +0100
Revision:
306:1f0269907d8b
Parent:
247:135e3186a638 
Synchronized with git revision f304c6ba83591678388024d30440e94781fa8d65



Full URL: https://github.com/mbedmicro/mbed/commit/f304c6ba83591678388024d30440e94781fa8d65/



[NUCLEOs] enhance i2c api

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 306:1f0269907d8b 65 int i2c1_inited = 0;
mbed_official 306:1f0269907d8b 66 int i2c2_inited = 0;
mbed_official 306:1f0269907d8b 67 int i2c3_inited = 0;
mbed_official 306:1f0269907d8b 68
mbed_official 306:1f0269907d8b 69 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 235:685d5f11838f 70 // Determine the I2C to use
mbed_official 235:685d5f11838f 71 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 235:685d5f11838f 72 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 235:685d5f11838f 73
mbed_official 235:685d5f11838f 74 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 235:685d5f11838f 75 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 235:685d5f11838f 76
mbed_official 306:1f0269907d8b 77 // Enable I2C1 clock and pinout if not done
mbed_official 306:1f0269907d8b 78 if ((obj->i2c == I2C_1)&& !i2c1_inited) {
mbed_official 306:1f0269907d8b 79 i2c1_inited = 1;
mbed_official 235:685d5f11838f 80 __I2C1_CLK_ENABLE();
mbed_official 306:1f0269907d8b 81 // Configure I2C pins
mbed_official 306:1f0269907d8b 82 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 306:1f0269907d8b 83 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 306:1f0269907d8b 84 pin_mode(sda, OpenDrain);
mbed_official 306:1f0269907d8b 85 pin_mode(scl, OpenDrain);
mbed_official 235:685d5f11838f 86 }
mbed_official 306:1f0269907d8b 87 // Enable I2C2 clock and pinout if not done
mbed_official 306:1f0269907d8b 88 if ((obj->i2c == I2C_2)&& !i2c2_inited) {
mbed_official 306:1f0269907d8b 89 i2c2_inited = 1;
mbed_official 306:1f0269907d8b 90 __I2C2_CLK_ENABLE();
mbed_official 306:1f0269907d8b 91 // Configure I2C pins
mbed_official 306:1f0269907d8b 92 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 306:1f0269907d8b 93 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 306:1f0269907d8b 94 pin_mode(sda, OpenDrain);
mbed_official 306:1f0269907d8b 95 pin_mode(scl, OpenDrain);
mbed_official 235:685d5f11838f 96 }
mbed_official 306:1f0269907d8b 97 // Enable I2C3 clock and pinout if not done
mbed_official 306:1f0269907d8b 98 if ((obj->i2c == I2C_3)&& !i2c3_inited) {
mbed_official 306:1f0269907d8b 99 i2c3_inited = 1;
mbed_official 306:1f0269907d8b 100 __I2C3_CLK_ENABLE();
mbed_official 306:1f0269907d8b 101 // Configure I2C pins
mbed_official 306:1f0269907d8b 102 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 306:1f0269907d8b 103 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 306:1f0269907d8b 104 pin_mode(sda, OpenDrain);
mbed_official 306:1f0269907d8b 105 pin_mode(scl, OpenDrain);
mbed_official 306:1f0269907d8b 106 }
mbed_official 235:685d5f11838f 107
mbed_official 235:685d5f11838f 108 // Reset to clear pending flags if any
mbed_official 235:685d5f11838f 109 i2c_reset(obj);
mbed_official 235:685d5f11838f 110
mbed_official 235:685d5f11838f 111 // I2C configuration
mbed_official 235:685d5f11838f 112 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 235:685d5f11838f 113
mbed_official 235:685d5f11838f 114 // I2C master by default
mbed_official 235:685d5f11838f 115 obj->slave = 0;
mbed_official 235:685d5f11838f 116 }
mbed_official 235:685d5f11838f 117
mbed_official 306:1f0269907d8b 118 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 235:685d5f11838f 119 MBED_ASSERT((hz != 0) && (hz <= 400000));
mbed_official 235:685d5f11838f 120 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 306:1f0269907d8b 121 int timeout;
mbed_official 306:1f0269907d8b 122
mbed_official 306:1f0269907d8b 123 // wait before init
mbed_official 306:1f0269907d8b 124 timeout = LONG_TIMEOUT;
mbed_official 306:1f0269907d8b 125 while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 235:685d5f11838f 126
mbed_official 235:685d5f11838f 127 // I2C configuration
mbed_official 235:685d5f11838f 128 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 235:685d5f11838f 129 I2cHandle.Init.ClockSpeed = hz;
mbed_official 235:685d5f11838f 130 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 235:685d5f11838f 131 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
mbed_official 235:685d5f11838f 132 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 235:685d5f11838f 133 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 235:685d5f11838f 134 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 235:685d5f11838f 135 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 235:685d5f11838f 136 HAL_I2C_Init(&I2cHandle);
mbed_official 235:685d5f11838f 137 if (obj->slave) {
mbed_official 235:685d5f11838f 138 /* Enable Address Acknowledge */
mbed_official 235:685d5f11838f 139 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 235:685d5f11838f 140 }
mbed_official 235:685d5f11838f 141
mbed_official 235:685d5f11838f 142 }
mbed_official 235:685d5f11838f 143
mbed_official 306:1f0269907d8b 144 inline int i2c_start(i2c_t *obj) {
mbed_official 235:685d5f11838f 145 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 146 int timeout;
mbed_official 235:685d5f11838f 147
mbed_official 235:685d5f11838f 148 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 149
mbed_official 235:685d5f11838f 150 // Clear Acknowledge failure flag
mbed_official 235:685d5f11838f 151 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 235:685d5f11838f 152
mbed_official 235:685d5f11838f 153 // Generate the START condition
mbed_official 235:685d5f11838f 154 i2c->CR1 |= I2C_CR1_START;
mbed_official 235:685d5f11838f 155
mbed_official 235:685d5f11838f 156 // Wait the START condition has been correctly sent
mbed_official 235:685d5f11838f 157 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 158 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 235:685d5f11838f 159 if ((timeout--) == 0) {
mbed_official 235:685d5f11838f 160 return 1;
mbed_official 235:685d5f11838f 161 }
mbed_official 235:685d5f11838f 162 }
mbed_official 235:685d5f11838f 163
mbed_official 235:685d5f11838f 164 return 0;
mbed_official 235:685d5f11838f 165 }
mbed_official 235:685d5f11838f 166
mbed_official 306:1f0269907d8b 167 inline int i2c_stop(i2c_t *obj) {
mbed_official 235:685d5f11838f 168 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 169
mbed_official 235:685d5f11838f 170 // Generate the STOP condition
mbed_official 235:685d5f11838f 171 i2c->CR1 |= I2C_CR1_STOP;
mbed_official 235:685d5f11838f 172
mbed_official 235:685d5f11838f 173 return 0;
mbed_official 235:685d5f11838f 174 }
mbed_official 235:685d5f11838f 175
mbed_official 306:1f0269907d8b 176 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 235:685d5f11838f 177 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 178 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 179 int timeout;
mbed_official 235:685d5f11838f 180 int count;
mbed_official 235:685d5f11838f 181 int value;
mbed_official 235:685d5f11838f 182
mbed_official 235:685d5f11838f 183 i2c_start(obj);
mbed_official 235:685d5f11838f 184
mbed_official 235:685d5f11838f 185 // Wait until SB flag is set
mbed_official 235:685d5f11838f 186 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 187 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 235:685d5f11838f 188 timeout--;
mbed_official 235:685d5f11838f 189 if (timeout == 0) {
mbed_official 247:135e3186a638 190 return -1;
mbed_official 235:685d5f11838f 191 }
mbed_official 235:685d5f11838f 192 }
mbed_official 235:685d5f11838f 193
mbed_official 235:685d5f11838f 194 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
mbed_official 235:685d5f11838f 195
mbed_official 235:685d5f11838f 196
mbed_official 235:685d5f11838f 197 // Wait address is acknowledged
mbed_official 235:685d5f11838f 198 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 199 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 235:685d5f11838f 200 timeout--;
mbed_official 235:685d5f11838f 201 if (timeout == 0) {
mbed_official 247:135e3186a638 202 return -1;
mbed_official 235:685d5f11838f 203 }
mbed_official 235:685d5f11838f 204 }
mbed_official 235:685d5f11838f 205 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 235:685d5f11838f 206
mbed_official 235:685d5f11838f 207 // Read all bytes except last one
mbed_official 235:685d5f11838f 208 for (count = 0; count < (length - 1); count++) {
mbed_official 235:685d5f11838f 209 value = i2c_byte_read(obj, 0);
mbed_official 235:685d5f11838f 210 data[count] = (char)value;
mbed_official 235:685d5f11838f 211 }
mbed_official 235:685d5f11838f 212
mbed_official 235:685d5f11838f 213 // If not repeated start, send stop.
mbed_official 235:685d5f11838f 214 // Warning: must be done BEFORE the data is read.
mbed_official 235:685d5f11838f 215 if (stop) {
mbed_official 235:685d5f11838f 216 i2c_stop(obj);
mbed_official 235:685d5f11838f 217 }
mbed_official 235:685d5f11838f 218
mbed_official 235:685d5f11838f 219 // Read the last byte
mbed_official 235:685d5f11838f 220 value = i2c_byte_read(obj, 1);
mbed_official 235:685d5f11838f 221 data[count] = (char)value;
mbed_official 235:685d5f11838f 222
mbed_official 235:685d5f11838f 223 return length;
mbed_official 235:685d5f11838f 224 }
mbed_official 235:685d5f11838f 225
mbed_official 306:1f0269907d8b 226 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 235:685d5f11838f 227 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 228 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 229 int timeout;
mbed_official 235:685d5f11838f 230 int count;
mbed_official 235:685d5f11838f 231
mbed_official 235:685d5f11838f 232 i2c_start(obj);
mbed_official 235:685d5f11838f 233
mbed_official 235:685d5f11838f 234 // Wait until SB flag is set
mbed_official 235:685d5f11838f 235 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 236 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 235:685d5f11838f 237 timeout--;
mbed_official 235:685d5f11838f 238 if (timeout == 0) {
mbed_official 247:135e3186a638 239 return -1;
mbed_official 235:685d5f11838f 240 }
mbed_official 235:685d5f11838f 241 }
mbed_official 235:685d5f11838f 242
mbed_official 235:685d5f11838f 243 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
mbed_official 235:685d5f11838f 244
mbed_official 235:685d5f11838f 245
mbed_official 235:685d5f11838f 246 // Wait address is acknowledged
mbed_official 235:685d5f11838f 247 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 248 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 235:685d5f11838f 249 timeout--;
mbed_official 235:685d5f11838f 250 if (timeout == 0) {
mbed_official 247:135e3186a638 251 return -1;
mbed_official 235:685d5f11838f 252 }
mbed_official 235:685d5f11838f 253 }
mbed_official 235:685d5f11838f 254 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 235:685d5f11838f 255
mbed_official 235:685d5f11838f 256 for (count = 0; count < length; count++) {
mbed_official 235:685d5f11838f 257 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 235:685d5f11838f 258 i2c_stop(obj);
mbed_official 247:135e3186a638 259 return -1;
mbed_official 235:685d5f11838f 260 }
mbed_official 235:685d5f11838f 261 }
mbed_official 235:685d5f11838f 262
mbed_official 235:685d5f11838f 263 // If not repeated start, send stop.
mbed_official 235:685d5f11838f 264 if (stop) {
mbed_official 235:685d5f11838f 265 i2c_stop(obj);
mbed_official 235:685d5f11838f 266 }
mbed_official 235:685d5f11838f 267
mbed_official 235:685d5f11838f 268 return count;
mbed_official 235:685d5f11838f 269 }
mbed_official 235:685d5f11838f 270
mbed_official 306:1f0269907d8b 271 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 235:685d5f11838f 272 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 273 int timeout;
mbed_official 235:685d5f11838f 274
mbed_official 235:685d5f11838f 275 if (last) {
mbed_official 235:685d5f11838f 276 // Don't acknowledge the last byte
mbed_official 235:685d5f11838f 277 i2c->CR1 &= ~I2C_CR1_ACK;
mbed_official 235:685d5f11838f 278 } else {
mbed_official 235:685d5f11838f 279 // Acknowledge the byte
mbed_official 235:685d5f11838f 280 i2c->CR1 |= I2C_CR1_ACK;
mbed_official 235:685d5f11838f 281 }
mbed_official 235:685d5f11838f 282
mbed_official 235:685d5f11838f 283 // Wait until the byte is received
mbed_official 235:685d5f11838f 284 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 285 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 235:685d5f11838f 286 if ((timeout--) == 0) {
mbed_official 247:135e3186a638 287 return -1;
mbed_official 235:685d5f11838f 288 }
mbed_official 235:685d5f11838f 289 }
mbed_official 235:685d5f11838f 290
mbed_official 235:685d5f11838f 291 return (int)i2c->DR;
mbed_official 235:685d5f11838f 292 }
mbed_official 235:685d5f11838f 293
mbed_official 306:1f0269907d8b 294 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 235:685d5f11838f 295 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 296 int timeout;
mbed_official 235:685d5f11838f 297
mbed_official 235:685d5f11838f 298 i2c->DR = (uint8_t)data;
mbed_official 235:685d5f11838f 299
mbed_official 235:685d5f11838f 300 // Wait until the byte is transmitted
mbed_official 235:685d5f11838f 301 timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 302 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
mbed_official 235:685d5f11838f 303 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
mbed_official 235:685d5f11838f 304 if ((timeout--) == 0) {
mbed_official 235:685d5f11838f 305 return 0;
mbed_official 235:685d5f11838f 306 }
mbed_official 235:685d5f11838f 307 }
mbed_official 235:685d5f11838f 308
mbed_official 235:685d5f11838f 309 return 1;
mbed_official 235:685d5f11838f 310 }
mbed_official 235:685d5f11838f 311
mbed_official 306:1f0269907d8b 312 void i2c_reset(i2c_t *obj) {
mbed_official 306:1f0269907d8b 313 int timeout;
mbed_official 306:1f0269907d8b 314
mbed_official 306:1f0269907d8b 315 // wait before reset
mbed_official 306:1f0269907d8b 316 timeout = LONG_TIMEOUT;
mbed_official 306:1f0269907d8b 317 while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 306:1f0269907d8b 318
mbed_official 235:685d5f11838f 319 if (obj->i2c == I2C_1) {
mbed_official 235:685d5f11838f 320 __I2C1_FORCE_RESET();
mbed_official 235:685d5f11838f 321 __I2C1_RELEASE_RESET();
mbed_official 235:685d5f11838f 322 }
mbed_official 235:685d5f11838f 323 if (obj->i2c == I2C_2) {
mbed_official 235:685d5f11838f 324 __I2C2_FORCE_RESET();
mbed_official 235:685d5f11838f 325 __I2C2_RELEASE_RESET();
mbed_official 235:685d5f11838f 326 }
mbed_official 235:685d5f11838f 327 if (obj->i2c == I2C_3) {
mbed_official 235:685d5f11838f 328 __I2C3_FORCE_RESET();
mbed_official 235:685d5f11838f 329 __I2C3_RELEASE_RESET();
mbed_official 235:685d5f11838f 330 }
mbed_official 235:685d5f11838f 331 }
mbed_official 235:685d5f11838f 332
mbed_official 235:685d5f11838f 333 #if DEVICE_I2CSLAVE
mbed_official 235:685d5f11838f 334
mbed_official 306:1f0269907d8b 335 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 235:685d5f11838f 336 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 337 uint16_t tmpreg = 0;
mbed_official 235:685d5f11838f 338
mbed_official 235:685d5f11838f 339 // Get the old register value
mbed_official 235:685d5f11838f 340 tmpreg = i2c->OAR1;
mbed_official 235:685d5f11838f 341 // Reset address bits
mbed_official 235:685d5f11838f 342 tmpreg &= 0xFC00;
mbed_official 235:685d5f11838f 343 // Set new address
mbed_official 235:685d5f11838f 344 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 235:685d5f11838f 345 // Store the new register value
mbed_official 235:685d5f11838f 346 i2c->OAR1 = tmpreg;
mbed_official 235:685d5f11838f 347 }
mbed_official 235:685d5f11838f 348
mbed_official 306:1f0269907d8b 349 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 235:685d5f11838f 350 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 351 if (enable_slave) {
mbed_official 235:685d5f11838f 352 obj->slave = 1;
mbed_official 235:685d5f11838f 353 /* Enable Address Acknowledge */
mbed_official 235:685d5f11838f 354 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 235:685d5f11838f 355 }
mbed_official 235:685d5f11838f 356 }
mbed_official 235:685d5f11838f 357
mbed_official 235:685d5f11838f 358 // See I2CSlave.h
mbed_official 235:685d5f11838f 359 #define NoData 0 // the slave has not been addressed
mbed_official 235:685d5f11838f 360 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 235:685d5f11838f 361 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 235:685d5f11838f 362 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 235:685d5f11838f 363
mbed_official 306:1f0269907d8b 364 int i2c_slave_receive(i2c_t *obj) {
mbed_official 235:685d5f11838f 365 int retValue = NoData;
mbed_official 235:685d5f11838f 366
mbed_official 235:685d5f11838f 367 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 235:685d5f11838f 368 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 235:685d5f11838f 369 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1)
mbed_official 235:685d5f11838f 370 retValue = ReadAddressed;
mbed_official 235:685d5f11838f 371 else
mbed_official 235:685d5f11838f 372 retValue = WriteAddressed;
mbed_official 235:685d5f11838f 373
mbed_official 235:685d5f11838f 374 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 235:685d5f11838f 375 }
mbed_official 235:685d5f11838f 376 }
mbed_official 235:685d5f11838f 377
mbed_official 235:685d5f11838f 378 return (retValue);
mbed_official 235:685d5f11838f 379 }
mbed_official 235:685d5f11838f 380
mbed_official 306:1f0269907d8b 381 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 235:685d5f11838f 382 uint32_t Timeout;
mbed_official 235:685d5f11838f 383 int size = 0;
mbed_official 235:685d5f11838f 384
mbed_official 235:685d5f11838f 385 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 386
mbed_official 235:685d5f11838f 387 while (length > 0) {
mbed_official 235:685d5f11838f 388 /* Wait until RXNE flag is set */
mbed_official 235:685d5f11838f 389 // Wait until the byte is received
mbed_official 235:685d5f11838f 390 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 391 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 235:685d5f11838f 392 Timeout--;
mbed_official 235:685d5f11838f 393 if (Timeout == 0) {
mbed_official 247:135e3186a638 394 return -1;
mbed_official 235:685d5f11838f 395 }
mbed_official 235:685d5f11838f 396 }
mbed_official 235:685d5f11838f 397
mbed_official 235:685d5f11838f 398 /* Read data from DR */
mbed_official 235:685d5f11838f 399 (*data++) = I2cHandle.Instance->DR;
mbed_official 235:685d5f11838f 400 length--;
mbed_official 235:685d5f11838f 401 size++;
mbed_official 235:685d5f11838f 402
mbed_official 235:685d5f11838f 403 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 235:685d5f11838f 404 /* Read data from DR */
mbed_official 235:685d5f11838f 405 (*data++) = I2cHandle.Instance->DR;
mbed_official 235:685d5f11838f 406 length--;
mbed_official 235:685d5f11838f 407 size++;
mbed_official 235:685d5f11838f 408 }
mbed_official 235:685d5f11838f 409 }
mbed_official 235:685d5f11838f 410
mbed_official 235:685d5f11838f 411 /* Wait until STOP flag is set */
mbed_official 235:685d5f11838f 412 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 413 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 235:685d5f11838f 414 Timeout--;
mbed_official 235:685d5f11838f 415 if (Timeout == 0) {
mbed_official 247:135e3186a638 416 return -1;
mbed_official 235:685d5f11838f 417 }
mbed_official 235:685d5f11838f 418 }
mbed_official 235:685d5f11838f 419
mbed_official 235:685d5f11838f 420 /* Clear STOP flag */
mbed_official 235:685d5f11838f 421 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
mbed_official 235:685d5f11838f 422
mbed_official 235:685d5f11838f 423 /* Wait until BUSY flag is reset */
mbed_official 235:685d5f11838f 424 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 425 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 235:685d5f11838f 426 Timeout--;
mbed_official 235:685d5f11838f 427 if (Timeout == 0) {
mbed_official 247:135e3186a638 428 return -1;
mbed_official 235:685d5f11838f 429 }
mbed_official 235:685d5f11838f 430 }
mbed_official 235:685d5f11838f 431
mbed_official 235:685d5f11838f 432 return size;
mbed_official 235:685d5f11838f 433 }
mbed_official 235:685d5f11838f 434
mbed_official 306:1f0269907d8b 435 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 235:685d5f11838f 436 uint32_t Timeout;
mbed_official 235:685d5f11838f 437 int size = 0;
mbed_official 235:685d5f11838f 438
mbed_official 235:685d5f11838f 439 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 235:685d5f11838f 440
mbed_official 235:685d5f11838f 441 while (length > 0) {
mbed_official 235:685d5f11838f 442 /* Wait until TXE flag is set */
mbed_official 235:685d5f11838f 443 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 444 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
mbed_official 235:685d5f11838f 445 Timeout--;
mbed_official 235:685d5f11838f 446 if (Timeout == 0) {
mbed_official 247:135e3186a638 447 return -1;
mbed_official 235:685d5f11838f 448 }
mbed_official 235:685d5f11838f 449 }
mbed_official 235:685d5f11838f 450
mbed_official 235:685d5f11838f 451
mbed_official 235:685d5f11838f 452 /* Write data to DR */
mbed_official 235:685d5f11838f 453 I2cHandle.Instance->DR = (*data++);
mbed_official 235:685d5f11838f 454 length--;
mbed_official 235:685d5f11838f 455 size++;
mbed_official 235:685d5f11838f 456
mbed_official 235:685d5f11838f 457 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 235:685d5f11838f 458 /* Write data to DR */
mbed_official 235:685d5f11838f 459 I2cHandle.Instance->DR = (*data++);
mbed_official 235:685d5f11838f 460 length--;
mbed_official 235:685d5f11838f 461 size++;
mbed_official 235:685d5f11838f 462 }
mbed_official 235:685d5f11838f 463 }
mbed_official 235:685d5f11838f 464
mbed_official 235:685d5f11838f 465 /* Wait until AF flag is set */
mbed_official 235:685d5f11838f 466 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 467 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
mbed_official 235:685d5f11838f 468 Timeout--;
mbed_official 235:685d5f11838f 469 if (Timeout == 0) {
mbed_official 247:135e3186a638 470 return -1;
mbed_official 235:685d5f11838f 471 }
mbed_official 235:685d5f11838f 472 }
mbed_official 235:685d5f11838f 473
mbed_official 235:685d5f11838f 474
mbed_official 235:685d5f11838f 475 /* Clear AF flag */
mbed_official 235:685d5f11838f 476 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 235:685d5f11838f 477
mbed_official 235:685d5f11838f 478
mbed_official 235:685d5f11838f 479 /* Wait until BUSY flag is reset */
mbed_official 235:685d5f11838f 480 Timeout = FLAG_TIMEOUT;
mbed_official 235:685d5f11838f 481 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 235:685d5f11838f 482 Timeout--;
mbed_official 235:685d5f11838f 483 if (Timeout == 0) {
mbed_official 247:135e3186a638 484 return -1;
mbed_official 235:685d5f11838f 485 }
mbed_official 235:685d5f11838f 486 }
mbed_official 235:685d5f11838f 487
mbed_official 235:685d5f11838f 488 I2cHandle.State = HAL_I2C_STATE_READY;
mbed_official 235:685d5f11838f 489
mbed_official 235:685d5f11838f 490 /* Process Unlocked */
mbed_official 235:685d5f11838f 491 __HAL_UNLOCK(&I2cHandle);
mbed_official 235:685d5f11838f 492
mbed_official 235:685d5f11838f 493 return size;
mbed_official 235:685d5f11838f 494 }
mbed_official 235:685d5f11838f 495
mbed_official 235:685d5f11838f 496
mbed_official 235:685d5f11838f 497 #endif // DEVICE_I2CSLAVE
mbed_official 235:685d5f11838f 498
mbed_official 235:685d5f11838f 499 #endif // DEVICE_I2C