shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F411RE/i2c_api.c@247:135e3186a638, 2014-07-01 (annotated)

Committer:
mbed_official
Date:
Tue Jul 01 15:00:09 2014 +0100
Revision:
247:135e3186a638
Parent:
235:685d5f11838f
Child:
305:1f0269907d8b
Synchronized with git revision 4f86d397190b9d18f22b4a189573d65b970f3662



Full URL: https://github.com/mbedmicro/mbed/commit/4f86d397190b9d18f22b4a189573d65b970f3662/



[NUCLEOs] enhance I2C API to make it work with EEPROM

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