Stuart Northfield / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_F429ZI/i2c_api.c@344:ed24f9926218, 2014-10-13 (annotated)

Committer:
mbed_official
Date:
Mon Oct 13 08:00:07 2014 +0100
Revision:
344:ed24f9926218
Parent:
340:28d1f895c6fe 
Synchronized with git revision 342790b0c3be997d6ed3744962729c4d9c6a9a39



Full URL: https://github.com/mbedmicro/mbed/commit/342790b0c3be997d6ed3744962729c4d9c6a9a39/



HAL: Disco_F429ZI - extensions of interrupt vectors, pin names and pin functions

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 340:28d1f895c6fe 1 /* mbed Microcontroller Library
mbed_official 340:28d1f895c6fe 2 *******************************************************************************
mbed_official 340:28d1f895c6fe 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 340:28d1f895c6fe 4 * All rights reserved.
mbed_official 340:28d1f895c6fe 5 *
mbed_official 340:28d1f895c6fe 6 * Redistribution and use in source and binary forms, with or without
mbed_official 340:28d1f895c6fe 7 * modification, are permitted provided that the following conditions are met:
mbed_official 340:28d1f895c6fe 8 *
mbed_official 340:28d1f895c6fe 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 340:28d1f895c6fe 10 * this list of conditions and the following disclaimer.
mbed_official 340:28d1f895c6fe 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 340:28d1f895c6fe 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 340:28d1f895c6fe 13 * and/or other materials provided with the distribution.
mbed_official 340:28d1f895c6fe 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 340:28d1f895c6fe 15 * may be used to endorse or promote products derived from this software
mbed_official 340:28d1f895c6fe 16 * without specific prior written permission.
mbed_official 340:28d1f895c6fe 17 *
mbed_official 340:28d1f895c6fe 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 340:28d1f895c6fe 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 340:28d1f895c6fe 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 340:28d1f895c6fe 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 340:28d1f895c6fe 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 340:28d1f895c6fe 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 340:28d1f895c6fe 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 340:28d1f895c6fe 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 340:28d1f895c6fe 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 340:28d1f895c6fe 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 340:28d1f895c6fe 28 *******************************************************************************
mbed_official 340:28d1f895c6fe 29 */
mbed_official 340:28d1f895c6fe 30 #include "mbed_assert.h"
mbed_official 340:28d1f895c6fe 31 #include "i2c_api.h"
mbed_official 340:28d1f895c6fe 32
mbed_official 340:28d1f895c6fe 33 #if DEVICE_I2C
mbed_official 340:28d1f895c6fe 34
mbed_official 340:28d1f895c6fe 35 #include "cmsis.h"
mbed_official 340:28d1f895c6fe 36 #include "pinmap.h"
mbed_official 340:28d1f895c6fe 37
mbed_official 340:28d1f895c6fe 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 340:28d1f895c6fe 39 not based on accurate values, they just guarantee that the application will
mbed_official 340:28d1f895c6fe 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 340:28d1f895c6fe 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 340:28d1f895c6fe 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 340:28d1f895c6fe 43
mbed_official 340:28d1f895c6fe 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 344:ed24f9926218 45 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 344:ed24f9926218 46 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 340:28d1f895c6fe 47 {PB_11, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 340:28d1f895c6fe 48 {PC_9, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
mbed_official 344:ed24f9926218 49 {PF_0, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 344:ed24f9926218 50 {PH_5, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 344:ed24f9926218 51 {PH_8, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
mbed_official 340:28d1f895c6fe 52 {NC, NC, 0}
mbed_official 340:28d1f895c6fe 53 };
mbed_official 340:28d1f895c6fe 54
mbed_official 340:28d1f895c6fe 55 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 340:28d1f895c6fe 56 {PA_8, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
mbed_official 340:28d1f895c6fe 57 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 344:ed24f9926218 58 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 340:28d1f895c6fe 59 {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 344:ed24f9926218 60 {PF_1, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 344:ed24f9926218 61 {PH_4, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 344:ed24f9926218 62 {PH_7, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
mbed_official 340:28d1f895c6fe 63 {NC, NC, 0}
mbed_official 340:28d1f895c6fe 64 };
mbed_official 340:28d1f895c6fe 65
mbed_official 340:28d1f895c6fe 66 I2C_HandleTypeDef I2cHandle;
mbed_official 340:28d1f895c6fe 67
mbed_official 340:28d1f895c6fe 68 int i2c1_inited = 0;
mbed_official 340:28d1f895c6fe 69 int i2c2_inited = 0;
mbed_official 340:28d1f895c6fe 70 int i2c3_inited = 0;
mbed_official 340:28d1f895c6fe 71
mbed_official 340:28d1f895c6fe 72 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 340:28d1f895c6fe 73 // Determine the I2C to use
mbed_official 340:28d1f895c6fe 74 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 340:28d1f895c6fe 75 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 340:28d1f895c6fe 76
mbed_official 340:28d1f895c6fe 77 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 340:28d1f895c6fe 78 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 340:28d1f895c6fe 79
mbed_official 340:28d1f895c6fe 80 // Enable I2C1 clock and pinout if not done
mbed_official 340:28d1f895c6fe 81 if ((obj->i2c == I2C_1)&& !i2c1_inited) {
mbed_official 340:28d1f895c6fe 82 i2c1_inited = 1;
mbed_official 340:28d1f895c6fe 83 __I2C1_CLK_ENABLE();
mbed_official 340:28d1f895c6fe 84 // Configure I2C pins
mbed_official 340:28d1f895c6fe 85 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 340:28d1f895c6fe 86 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 340:28d1f895c6fe 87 pin_mode(sda, OpenDrain);
mbed_official 340:28d1f895c6fe 88 pin_mode(scl, OpenDrain);
mbed_official 340:28d1f895c6fe 89 }
mbed_official 340:28d1f895c6fe 90 // Enable I2C2 clock and pinout if not done
mbed_official 340:28d1f895c6fe 91 if ((obj->i2c == I2C_2)&& !i2c2_inited) {
mbed_official 340:28d1f895c6fe 92 i2c2_inited = 1;
mbed_official 340:28d1f895c6fe 93 __I2C2_CLK_ENABLE();
mbed_official 340:28d1f895c6fe 94 // Configure I2C pins
mbed_official 340:28d1f895c6fe 95 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 340:28d1f895c6fe 96 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 340:28d1f895c6fe 97 pin_mode(sda, OpenDrain);
mbed_official 340:28d1f895c6fe 98 pin_mode(scl, OpenDrain);
mbed_official 340:28d1f895c6fe 99 }
mbed_official 340:28d1f895c6fe 100 // Enable I2C3 clock and pinout if not done
mbed_official 340:28d1f895c6fe 101 if ((obj->i2c == I2C_3)&& !i2c3_inited) {
mbed_official 340:28d1f895c6fe 102 i2c3_inited = 1;
mbed_official 340:28d1f895c6fe 103 __I2C3_CLK_ENABLE();
mbed_official 340:28d1f895c6fe 104 // Configure I2C pins
mbed_official 340:28d1f895c6fe 105 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 340:28d1f895c6fe 106 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 340:28d1f895c6fe 107 pin_mode(sda, OpenDrain);
mbed_official 340:28d1f895c6fe 108 pin_mode(scl, OpenDrain);
mbed_official 340:28d1f895c6fe 109 }
mbed_official 340:28d1f895c6fe 110
mbed_official 340:28d1f895c6fe 111 // Reset to clear pending flags if any
mbed_official 340:28d1f895c6fe 112 i2c_reset(obj);
mbed_official 340:28d1f895c6fe 113
mbed_official 340:28d1f895c6fe 114 // I2C configuration
mbed_official 340:28d1f895c6fe 115 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 340:28d1f895c6fe 116
mbed_official 340:28d1f895c6fe 117 // I2C master by default
mbed_official 340:28d1f895c6fe 118 obj->slave = 0;
mbed_official 340:28d1f895c6fe 119 }
mbed_official 340:28d1f895c6fe 120
mbed_official 340:28d1f895c6fe 121 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 340:28d1f895c6fe 122 MBED_ASSERT((hz != 0) && (hz <= 400000));
mbed_official 340:28d1f895c6fe 123 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 124 int timeout;
mbed_official 340:28d1f895c6fe 125
mbed_official 340:28d1f895c6fe 126 // wait before init
mbed_official 340:28d1f895c6fe 127 timeout = LONG_TIMEOUT;
mbed_official 340:28d1f895c6fe 128 while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 340:28d1f895c6fe 129
mbed_official 340:28d1f895c6fe 130 // I2C configuration
mbed_official 340:28d1f895c6fe 131 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 340:28d1f895c6fe 132 I2cHandle.Init.ClockSpeed = hz;
mbed_official 340:28d1f895c6fe 133 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 340:28d1f895c6fe 134 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
mbed_official 340:28d1f895c6fe 135 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 340:28d1f895c6fe 136 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 340:28d1f895c6fe 137 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 340:28d1f895c6fe 138 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 340:28d1f895c6fe 139 HAL_I2C_Init(&I2cHandle);
mbed_official 340:28d1f895c6fe 140 if (obj->slave) {
mbed_official 340:28d1f895c6fe 141 /* Enable Address Acknowledge */
mbed_official 340:28d1f895c6fe 142 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 340:28d1f895c6fe 143 }
mbed_official 340:28d1f895c6fe 144
mbed_official 340:28d1f895c6fe 145 }
mbed_official 340:28d1f895c6fe 146
mbed_official 340:28d1f895c6fe 147 inline int i2c_start(i2c_t *obj) {
mbed_official 340:28d1f895c6fe 148 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 149 int timeout;
mbed_official 340:28d1f895c6fe 150
mbed_official 340:28d1f895c6fe 151 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 152
mbed_official 340:28d1f895c6fe 153 // Clear Acknowledge failure flag
mbed_official 340:28d1f895c6fe 154 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 340:28d1f895c6fe 155
mbed_official 340:28d1f895c6fe 156 // Generate the START condition
mbed_official 340:28d1f895c6fe 157 i2c->CR1 |= I2C_CR1_START;
mbed_official 340:28d1f895c6fe 158
mbed_official 340:28d1f895c6fe 159 // Wait the START condition has been correctly sent
mbed_official 340:28d1f895c6fe 160 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 161 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 340:28d1f895c6fe 162 if ((timeout--) == 0) {
mbed_official 340:28d1f895c6fe 163 return 1;
mbed_official 340:28d1f895c6fe 164 }
mbed_official 340:28d1f895c6fe 165 }
mbed_official 340:28d1f895c6fe 166
mbed_official 340:28d1f895c6fe 167 return 0;
mbed_official 340:28d1f895c6fe 168 }
mbed_official 340:28d1f895c6fe 169
mbed_official 340:28d1f895c6fe 170 inline int i2c_stop(i2c_t *obj) {
mbed_official 340:28d1f895c6fe 171 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 172
mbed_official 340:28d1f895c6fe 173 // Generate the STOP condition
mbed_official 340:28d1f895c6fe 174 i2c->CR1 |= I2C_CR1_STOP;
mbed_official 340:28d1f895c6fe 175
mbed_official 340:28d1f895c6fe 176 return 0;
mbed_official 340:28d1f895c6fe 177 }
mbed_official 340:28d1f895c6fe 178
mbed_official 340:28d1f895c6fe 179 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 340:28d1f895c6fe 180 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 181 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 182 int timeout;
mbed_official 340:28d1f895c6fe 183 int count;
mbed_official 340:28d1f895c6fe 184 int value;
mbed_official 340:28d1f895c6fe 185
mbed_official 340:28d1f895c6fe 186 i2c_start(obj);
mbed_official 340:28d1f895c6fe 187
mbed_official 340:28d1f895c6fe 188 // Wait until SB flag is set
mbed_official 340:28d1f895c6fe 189 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 190 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 340:28d1f895c6fe 191 timeout--;
mbed_official 340:28d1f895c6fe 192 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 193 return -1;
mbed_official 340:28d1f895c6fe 194 }
mbed_official 340:28d1f895c6fe 195 }
mbed_official 340:28d1f895c6fe 196
mbed_official 340:28d1f895c6fe 197 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
mbed_official 340:28d1f895c6fe 198
mbed_official 340:28d1f895c6fe 199
mbed_official 340:28d1f895c6fe 200 // Wait address is acknowledged
mbed_official 340:28d1f895c6fe 201 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 202 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 340:28d1f895c6fe 203 timeout--;
mbed_official 340:28d1f895c6fe 204 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 205 return -1;
mbed_official 340:28d1f895c6fe 206 }
mbed_official 340:28d1f895c6fe 207 }
mbed_official 340:28d1f895c6fe 208 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 340:28d1f895c6fe 209
mbed_official 340:28d1f895c6fe 210 // Read all bytes except last one
mbed_official 340:28d1f895c6fe 211 for (count = 0; count < (length - 1); count++) {
mbed_official 340:28d1f895c6fe 212 value = i2c_byte_read(obj, 0);
mbed_official 340:28d1f895c6fe 213 data[count] = (char)value;
mbed_official 340:28d1f895c6fe 214 }
mbed_official 340:28d1f895c6fe 215
mbed_official 340:28d1f895c6fe 216 // If not repeated start, send stop.
mbed_official 340:28d1f895c6fe 217 // Warning: must be done BEFORE the data is read.
mbed_official 340:28d1f895c6fe 218 if (stop) {
mbed_official 340:28d1f895c6fe 219 i2c_stop(obj);
mbed_official 340:28d1f895c6fe 220 }
mbed_official 340:28d1f895c6fe 221
mbed_official 340:28d1f895c6fe 222 // Read the last byte
mbed_official 340:28d1f895c6fe 223 value = i2c_byte_read(obj, 1);
mbed_official 340:28d1f895c6fe 224 data[count] = (char)value;
mbed_official 340:28d1f895c6fe 225
mbed_official 340:28d1f895c6fe 226 return length;
mbed_official 340:28d1f895c6fe 227 }
mbed_official 340:28d1f895c6fe 228
mbed_official 340:28d1f895c6fe 229 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 340:28d1f895c6fe 230 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 231 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 232 int timeout;
mbed_official 340:28d1f895c6fe 233 int count;
mbed_official 340:28d1f895c6fe 234
mbed_official 340:28d1f895c6fe 235 i2c_start(obj);
mbed_official 340:28d1f895c6fe 236
mbed_official 340:28d1f895c6fe 237 // Wait until SB flag is set
mbed_official 340:28d1f895c6fe 238 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 239 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 340:28d1f895c6fe 240 timeout--;
mbed_official 340:28d1f895c6fe 241 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 242 return -1;
mbed_official 340:28d1f895c6fe 243 }
mbed_official 340:28d1f895c6fe 244 }
mbed_official 340:28d1f895c6fe 245
mbed_official 340:28d1f895c6fe 246 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
mbed_official 340:28d1f895c6fe 247
mbed_official 340:28d1f895c6fe 248
mbed_official 340:28d1f895c6fe 249 // Wait address is acknowledged
mbed_official 340:28d1f895c6fe 250 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 251 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 340:28d1f895c6fe 252 timeout--;
mbed_official 340:28d1f895c6fe 253 if (timeout == 0) {
mbed_official 340:28d1f895c6fe 254 return -1;
mbed_official 340:28d1f895c6fe 255 }
mbed_official 340:28d1f895c6fe 256 }
mbed_official 340:28d1f895c6fe 257 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 340:28d1f895c6fe 258
mbed_official 340:28d1f895c6fe 259 for (count = 0; count < length; count++) {
mbed_official 340:28d1f895c6fe 260 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 340:28d1f895c6fe 261 i2c_stop(obj);
mbed_official 340:28d1f895c6fe 262 return -1;
mbed_official 340:28d1f895c6fe 263 }
mbed_official 340:28d1f895c6fe 264 }
mbed_official 340:28d1f895c6fe 265
mbed_official 340:28d1f895c6fe 266 // If not repeated start, send stop.
mbed_official 340:28d1f895c6fe 267 if (stop) {
mbed_official 340:28d1f895c6fe 268 i2c_stop(obj);
mbed_official 340:28d1f895c6fe 269 }
mbed_official 340:28d1f895c6fe 270
mbed_official 340:28d1f895c6fe 271 return count;
mbed_official 340:28d1f895c6fe 272 }
mbed_official 340:28d1f895c6fe 273
mbed_official 340:28d1f895c6fe 274 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 340:28d1f895c6fe 275 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 276 int timeout;
mbed_official 340:28d1f895c6fe 277
mbed_official 340:28d1f895c6fe 278 if (last) {
mbed_official 340:28d1f895c6fe 279 // Don't acknowledge the last byte
mbed_official 340:28d1f895c6fe 280 i2c->CR1 &= ~I2C_CR1_ACK;
mbed_official 340:28d1f895c6fe 281 } else {
mbed_official 340:28d1f895c6fe 282 // Acknowledge the byte
mbed_official 340:28d1f895c6fe 283 i2c->CR1 |= I2C_CR1_ACK;
mbed_official 340:28d1f895c6fe 284 }
mbed_official 340:28d1f895c6fe 285
mbed_official 340:28d1f895c6fe 286 // Wait until the byte is received
mbed_official 340:28d1f895c6fe 287 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 288 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 340:28d1f895c6fe 289 if ((timeout--) == 0) {
mbed_official 340:28d1f895c6fe 290 return -1;
mbed_official 340:28d1f895c6fe 291 }
mbed_official 340:28d1f895c6fe 292 }
mbed_official 340:28d1f895c6fe 293
mbed_official 340:28d1f895c6fe 294 return (int)i2c->DR;
mbed_official 340:28d1f895c6fe 295 }
mbed_official 340:28d1f895c6fe 296
mbed_official 340:28d1f895c6fe 297 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 340:28d1f895c6fe 298 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 299 int timeout;
mbed_official 340:28d1f895c6fe 300
mbed_official 340:28d1f895c6fe 301 i2c->DR = (uint8_t)data;
mbed_official 340:28d1f895c6fe 302
mbed_official 340:28d1f895c6fe 303 // Wait until the byte is transmitted
mbed_official 340:28d1f895c6fe 304 timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 305 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
mbed_official 340:28d1f895c6fe 306 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
mbed_official 340:28d1f895c6fe 307 if ((timeout--) == 0) {
mbed_official 340:28d1f895c6fe 308 return 0;
mbed_official 340:28d1f895c6fe 309 }
mbed_official 340:28d1f895c6fe 310 }
mbed_official 340:28d1f895c6fe 311
mbed_official 340:28d1f895c6fe 312 return 1;
mbed_official 340:28d1f895c6fe 313 }
mbed_official 340:28d1f895c6fe 314
mbed_official 340:28d1f895c6fe 315 void i2c_reset(i2c_t *obj) {
mbed_official 340:28d1f895c6fe 316 int timeout;
mbed_official 340:28d1f895c6fe 317
mbed_official 340:28d1f895c6fe 318 // wait before reset
mbed_official 340:28d1f895c6fe 319 timeout = LONG_TIMEOUT;
mbed_official 340:28d1f895c6fe 320 while((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 340:28d1f895c6fe 321
mbed_official 340:28d1f895c6fe 322 if (obj->i2c == I2C_1) {
mbed_official 340:28d1f895c6fe 323 __I2C1_FORCE_RESET();
mbed_official 340:28d1f895c6fe 324 __I2C1_RELEASE_RESET();
mbed_official 340:28d1f895c6fe 325 }
mbed_official 340:28d1f895c6fe 326 if (obj->i2c == I2C_2) {
mbed_official 340:28d1f895c6fe 327 __I2C2_FORCE_RESET();
mbed_official 340:28d1f895c6fe 328 __I2C2_RELEASE_RESET();
mbed_official 340:28d1f895c6fe 329 }
mbed_official 340:28d1f895c6fe 330 if (obj->i2c == I2C_3) {
mbed_official 340:28d1f895c6fe 331 __I2C3_FORCE_RESET();
mbed_official 340:28d1f895c6fe 332 __I2C3_RELEASE_RESET();
mbed_official 340:28d1f895c6fe 333 }
mbed_official 340:28d1f895c6fe 334 }
mbed_official 340:28d1f895c6fe 335
mbed_official 340:28d1f895c6fe 336 #if DEVICE_I2CSLAVE
mbed_official 340:28d1f895c6fe 337
mbed_official 340:28d1f895c6fe 338 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 340:28d1f895c6fe 339 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 340 uint16_t tmpreg = 0;
mbed_official 340:28d1f895c6fe 341
mbed_official 340:28d1f895c6fe 342 // Get the old register value
mbed_official 340:28d1f895c6fe 343 tmpreg = i2c->OAR1;
mbed_official 340:28d1f895c6fe 344 // Reset address bits
mbed_official 340:28d1f895c6fe 345 tmpreg &= 0xFC00;
mbed_official 340:28d1f895c6fe 346 // Set new address
mbed_official 340:28d1f895c6fe 347 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 340:28d1f895c6fe 348 // Store the new register value
mbed_official 340:28d1f895c6fe 349 i2c->OAR1 = tmpreg;
mbed_official 340:28d1f895c6fe 350 }
mbed_official 340:28d1f895c6fe 351
mbed_official 340:28d1f895c6fe 352 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 340:28d1f895c6fe 353 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 354 if (enable_slave) {
mbed_official 340:28d1f895c6fe 355 obj->slave = 1;
mbed_official 340:28d1f895c6fe 356 /* Enable Address Acknowledge */
mbed_official 340:28d1f895c6fe 357 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 340:28d1f895c6fe 358 }
mbed_official 340:28d1f895c6fe 359 }
mbed_official 340:28d1f895c6fe 360
mbed_official 340:28d1f895c6fe 361 // See I2CSlave.h
mbed_official 340:28d1f895c6fe 362 #define NoData 0 // the slave has not been addressed
mbed_official 340:28d1f895c6fe 363 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 340:28d1f895c6fe 364 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 340:28d1f895c6fe 365 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 340:28d1f895c6fe 366
mbed_official 340:28d1f895c6fe 367 int i2c_slave_receive(i2c_t *obj) {
mbed_official 340:28d1f895c6fe 368 int retValue = NoData;
mbed_official 340:28d1f895c6fe 369
mbed_official 340:28d1f895c6fe 370 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 340:28d1f895c6fe 371 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 340:28d1f895c6fe 372 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1)
mbed_official 340:28d1f895c6fe 373 retValue = ReadAddressed;
mbed_official 340:28d1f895c6fe 374 else
mbed_official 340:28d1f895c6fe 375 retValue = WriteAddressed;
mbed_official 340:28d1f895c6fe 376
mbed_official 340:28d1f895c6fe 377 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 340:28d1f895c6fe 378 }
mbed_official 340:28d1f895c6fe 379 }
mbed_official 340:28d1f895c6fe 380
mbed_official 340:28d1f895c6fe 381 return (retValue);
mbed_official 340:28d1f895c6fe 382 }
mbed_official 340:28d1f895c6fe 383
mbed_official 340:28d1f895c6fe 384 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 340:28d1f895c6fe 385 uint32_t Timeout;
mbed_official 340:28d1f895c6fe 386 int size = 0;
mbed_official 340:28d1f895c6fe 387
mbed_official 340:28d1f895c6fe 388 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 389
mbed_official 340:28d1f895c6fe 390 while (length > 0) {
mbed_official 340:28d1f895c6fe 391 /* Wait until RXNE flag is set */
mbed_official 340:28d1f895c6fe 392 // Wait until the byte is received
mbed_official 340:28d1f895c6fe 393 Timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 394 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 340:28d1f895c6fe 395 Timeout--;
mbed_official 340:28d1f895c6fe 396 if (Timeout == 0) {
mbed_official 340:28d1f895c6fe 397 return -1;
mbed_official 340:28d1f895c6fe 398 }
mbed_official 340:28d1f895c6fe 399 }
mbed_official 340:28d1f895c6fe 400
mbed_official 340:28d1f895c6fe 401 /* Read data from DR */
mbed_official 340:28d1f895c6fe 402 (*data++) = I2cHandle.Instance->DR;
mbed_official 340:28d1f895c6fe 403 length--;
mbed_official 340:28d1f895c6fe 404 size++;
mbed_official 340:28d1f895c6fe 405
mbed_official 340:28d1f895c6fe 406 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 340:28d1f895c6fe 407 /* Read data from DR */
mbed_official 340:28d1f895c6fe 408 (*data++) = I2cHandle.Instance->DR;
mbed_official 340:28d1f895c6fe 409 length--;
mbed_official 340:28d1f895c6fe 410 size++;
mbed_official 340:28d1f895c6fe 411 }
mbed_official 340:28d1f895c6fe 412 }
mbed_official 340:28d1f895c6fe 413
mbed_official 340:28d1f895c6fe 414 /* Wait until STOP flag is set */
mbed_official 340:28d1f895c6fe 415 Timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 416 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 340:28d1f895c6fe 417 Timeout--;
mbed_official 340:28d1f895c6fe 418 if (Timeout == 0) {
mbed_official 340:28d1f895c6fe 419 return -1;
mbed_official 340:28d1f895c6fe 420 }
mbed_official 340:28d1f895c6fe 421 }
mbed_official 340:28d1f895c6fe 422
mbed_official 340:28d1f895c6fe 423 /* Clear STOP flag */
mbed_official 340:28d1f895c6fe 424 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
mbed_official 340:28d1f895c6fe 425
mbed_official 340:28d1f895c6fe 426 /* Wait until BUSY flag is reset */
mbed_official 340:28d1f895c6fe 427 Timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 428 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 340:28d1f895c6fe 429 Timeout--;
mbed_official 340:28d1f895c6fe 430 if (Timeout == 0) {
mbed_official 340:28d1f895c6fe 431 return -1;
mbed_official 340:28d1f895c6fe 432 }
mbed_official 340:28d1f895c6fe 433 }
mbed_official 340:28d1f895c6fe 434
mbed_official 340:28d1f895c6fe 435 return size;
mbed_official 340:28d1f895c6fe 436 }
mbed_official 340:28d1f895c6fe 437
mbed_official 340:28d1f895c6fe 438 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 340:28d1f895c6fe 439 uint32_t Timeout;
mbed_official 340:28d1f895c6fe 440 int size = 0;
mbed_official 340:28d1f895c6fe 441
mbed_official 340:28d1f895c6fe 442 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 340:28d1f895c6fe 443
mbed_official 340:28d1f895c6fe 444 while (length > 0) {
mbed_official 340:28d1f895c6fe 445 /* Wait until TXE flag is set */
mbed_official 340:28d1f895c6fe 446 Timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 447 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
mbed_official 340:28d1f895c6fe 448 Timeout--;
mbed_official 340:28d1f895c6fe 449 if (Timeout == 0) {
mbed_official 340:28d1f895c6fe 450 return -1;
mbed_official 340:28d1f895c6fe 451 }
mbed_official 340:28d1f895c6fe 452 }
mbed_official 340:28d1f895c6fe 453
mbed_official 340:28d1f895c6fe 454
mbed_official 340:28d1f895c6fe 455 /* Write data to DR */
mbed_official 340:28d1f895c6fe 456 I2cHandle.Instance->DR = (*data++);
mbed_official 340:28d1f895c6fe 457 length--;
mbed_official 340:28d1f895c6fe 458 size++;
mbed_official 340:28d1f895c6fe 459
mbed_official 340:28d1f895c6fe 460 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 340:28d1f895c6fe 461 /* Write data to DR */
mbed_official 340:28d1f895c6fe 462 I2cHandle.Instance->DR = (*data++);
mbed_official 340:28d1f895c6fe 463 length--;
mbed_official 340:28d1f895c6fe 464 size++;
mbed_official 340:28d1f895c6fe 465 }
mbed_official 340:28d1f895c6fe 466 }
mbed_official 340:28d1f895c6fe 467
mbed_official 340:28d1f895c6fe 468 /* Wait until AF flag is set */
mbed_official 340:28d1f895c6fe 469 Timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 470 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
mbed_official 340:28d1f895c6fe 471 Timeout--;
mbed_official 340:28d1f895c6fe 472 if (Timeout == 0) {
mbed_official 340:28d1f895c6fe 473 return -1;
mbed_official 340:28d1f895c6fe 474 }
mbed_official 340:28d1f895c6fe 475 }
mbed_official 340:28d1f895c6fe 476
mbed_official 340:28d1f895c6fe 477
mbed_official 340:28d1f895c6fe 478 /* Clear AF flag */
mbed_official 340:28d1f895c6fe 479 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 340:28d1f895c6fe 480
mbed_official 340:28d1f895c6fe 481
mbed_official 340:28d1f895c6fe 482 /* Wait until BUSY flag is reset */
mbed_official 340:28d1f895c6fe 483 Timeout = FLAG_TIMEOUT;
mbed_official 340:28d1f895c6fe 484 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 340:28d1f895c6fe 485 Timeout--;
mbed_official 340:28d1f895c6fe 486 if (Timeout == 0) {
mbed_official 340:28d1f895c6fe 487 return -1;
mbed_official 340:28d1f895c6fe 488 }
mbed_official 340:28d1f895c6fe 489 }
mbed_official 340:28d1f895c6fe 490
mbed_official 340:28d1f895c6fe 491 I2cHandle.State = HAL_I2C_STATE_READY;
mbed_official 340:28d1f895c6fe 492
mbed_official 340:28d1f895c6fe 493 /* Process Unlocked */
mbed_official 340:28d1f895c6fe 494 __HAL_UNLOCK(&I2cHandle);
mbed_official 340:28d1f895c6fe 495
mbed_official 340:28d1f895c6fe 496 return size;
mbed_official 340:28d1f895c6fe 497 }
mbed_official 340:28d1f895c6fe 498
mbed_official 340:28d1f895c6fe 499
mbed_official 340:28d1f895c6fe 500 #endif // DEVICE_I2CSLAVE
mbed_official 340:28d1f895c6fe 501
mbed_official 340:28d1f895c6fe 502 #endif // DEVICE_I2C