Sigve Sebastian Farstad / mbed-src

mbed w/ spi bug fig

Dependents:   display-puck

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_F407VG/i2c_api.c@242:7074e42da0b2, 2014-06-27 (annotated)

Committer:
mbed_official
Date:
Fri Jun 27 07:30:09 2014 +0100
Revision:
242:7074e42da0b2
Parent:
227:7bd0639b8911 
Synchronized with git revision 124ef5e3add9e74a3221347a3fbeea7c8b3cf353



Full URL: https://github.com/mbedmicro/mbed/commit/124ef5e3add9e74a3221347a3fbeea7c8b3cf353/



[DISCO_F407VG] HAL update.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 133:d4dda5c437f0 1 /* mbed Microcontroller Library
mbed_official 133:d4dda5c437f0 2 *******************************************************************************
mbed_official 133:d4dda5c437f0 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 133:d4dda5c437f0 4 * All rights reserved.
mbed_official 133:d4dda5c437f0 5 *
mbed_official 133:d4dda5c437f0 6 * Redistribution and use in source and binary forms, with or without
mbed_official 133:d4dda5c437f0 7 * modification, are permitted provided that the following conditions are met:
mbed_official 133:d4dda5c437f0 8 *
mbed_official 133:d4dda5c437f0 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 133:d4dda5c437f0 10 * this list of conditions and the following disclaimer.
mbed_official 133:d4dda5c437f0 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 133:d4dda5c437f0 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 133:d4dda5c437f0 13 * and/or other materials provided with the distribution.
mbed_official 133:d4dda5c437f0 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 133:d4dda5c437f0 15 * may be used to endorse or promote products derived from this software
mbed_official 133:d4dda5c437f0 16 * without specific prior written permission.
mbed_official 133:d4dda5c437f0 17 *
mbed_official 133:d4dda5c437f0 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 133:d4dda5c437f0 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 133:d4dda5c437f0 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 133:d4dda5c437f0 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 133:d4dda5c437f0 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 133:d4dda5c437f0 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 133:d4dda5c437f0 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 133:d4dda5c437f0 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 133:d4dda5c437f0 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 133:d4dda5c437f0 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 133:d4dda5c437f0 28 *******************************************************************************
mbed_official 133:d4dda5c437f0 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 133:d4dda5c437f0 31 #include "i2c_api.h"
mbed_official 133:d4dda5c437f0 32
mbed_official 133:d4dda5c437f0 33 #if DEVICE_I2C
mbed_official 133:d4dda5c437f0 34
mbed_official 133:d4dda5c437f0 35 #include "cmsis.h"
mbed_official 133:d4dda5c437f0 36 #include "pinmap.h"
mbed_official 133:d4dda5c437f0 37
mbed_official 133:d4dda5c437f0 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 227:7bd0639b8911 39 not based on accurate values, they just guarantee that the application will
mbed_official 227:7bd0639b8911 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 133:d4dda5c437f0 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 133:d4dda5c437f0 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 133:d4dda5c437f0 43
mbed_official 133:d4dda5c437f0 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 133:d4dda5c437f0 45 {PB_11, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 133:d4dda5c437f0 46 {PF_0 , I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 133:d4dda5c437f0 47 {PH_5 , I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 133:d4dda5c437f0 48 {PB_7, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 133:d4dda5c437f0 49 {PB_9, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 133:d4dda5c437f0 50 {PC_9, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
mbed_official 133:d4dda5c437f0 51 {PH_8, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
mbed_official 133:d4dda5c437f0 52 {NC, NC, 0}
mbed_official 133:d4dda5c437f0 53 };
mbed_official 133:d4dda5c437f0 54
mbed_official 133:d4dda5c437f0 55 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 133:d4dda5c437f0 56 {PA_8, I2C_3, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C3)},
mbed_official 133:d4dda5c437f0 57 {PB_6, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 133:d4dda5c437f0 58 {PB_8, I2C_1, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
mbed_official 133:d4dda5c437f0 59 {PB_10, I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 133:d4dda5c437f0 60 {PF_1 , I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 133:d4dda5c437f0 61 {PH_4 , I2C_2, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C2)},
mbed_official 133:d4dda5c437f0 62 {NC, NC, 0}
mbed_official 133:d4dda5c437f0 63 };
mbed_official 133:d4dda5c437f0 64
mbed_official 133:d4dda5c437f0 65 I2C_HandleTypeDef I2cHandle;
mbed_official 133:d4dda5c437f0 66
mbed_official 227:7bd0639b8911 67 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 133:d4dda5c437f0 68 // Determine the I2C to use
mbed_official 133:d4dda5c437f0 69 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 133:d4dda5c437f0 70 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 133:d4dda5c437f0 71
mbed_official 133:d4dda5c437f0 72 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 73 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 133:d4dda5c437f0 74
mbed_official 133:d4dda5c437f0 75 // Enable I2C clock
mbed_official 227:7bd0639b8911 76 if (obj->i2c == I2C_1) {
mbed_official 133:d4dda5c437f0 77 __I2C1_CLK_ENABLE();
mbed_official 133:d4dda5c437f0 78 }
mbed_official 133:d4dda5c437f0 79 if (obj->i2c == I2C_2) {
mbed_official 133:d4dda5c437f0 80 __I2C2_CLK_ENABLE();
mbed_official 133:d4dda5c437f0 81 }
mbed_official 133:d4dda5c437f0 82 if (obj->i2c == I2C_3) {
mbed_official 133:d4dda5c437f0 83 __I2C3_CLK_ENABLE();
mbed_official 133:d4dda5c437f0 84 }
mbed_official 133:d4dda5c437f0 85
mbed_official 133:d4dda5c437f0 86 // Configure I2C pins
mbed_official 133:d4dda5c437f0 87 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 133:d4dda5c437f0 88 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 133:d4dda5c437f0 89 pin_mode(sda, OpenDrain);
mbed_official 133:d4dda5c437f0 90 pin_mode(scl, OpenDrain);
mbed_official 133:d4dda5c437f0 91
mbed_official 133:d4dda5c437f0 92 // Reset to clear pending flags if any
mbed_official 133:d4dda5c437f0 93 i2c_reset(obj);
mbed_official 133:d4dda5c437f0 94
mbed_official 133:d4dda5c437f0 95 // I2C configuration
mbed_official 227:7bd0639b8911 96 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 242:7074e42da0b2 97
mbed_official 242:7074e42da0b2 98 // I2C master by default
mbed_official 242:7074e42da0b2 99 obj->slave = 0;
mbed_official 133:d4dda5c437f0 100 }
mbed_official 133:d4dda5c437f0 101
mbed_official 133:d4dda5c437f0 102 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 227:7bd0639b8911 103 MBED_ASSERT((hz != 0) && (hz <= 400000));
mbed_official 133:d4dda5c437f0 104 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 105
mbed_official 227:7bd0639b8911 106
mbed_official 227:7bd0639b8911 107 // I2C configuration
mbed_official 227:7bd0639b8911 108 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
mbed_official 227:7bd0639b8911 109 I2cHandle.Init.ClockSpeed = hz;
mbed_official 227:7bd0639b8911 110 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
mbed_official 227:7bd0639b8911 111 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
mbed_official 227:7bd0639b8911 112 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
mbed_official 227:7bd0639b8911 113 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
mbed_official 227:7bd0639b8911 114 I2cHandle.Init.OwnAddress1 = 0;
mbed_official 227:7bd0639b8911 115 I2cHandle.Init.OwnAddress2 = 0;
mbed_official 227:7bd0639b8911 116 HAL_I2C_Init(&I2cHandle);
mbed_official 242:7074e42da0b2 117 if (obj->slave) {
mbed_official 242:7074e42da0b2 118 /* Enable Address Acknowledge */
mbed_official 242:7074e42da0b2 119 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 242:7074e42da0b2 120 }
mbed_official 227:7bd0639b8911 121
mbed_official 133:d4dda5c437f0 122 }
mbed_official 133:d4dda5c437f0 123
mbed_official 133:d4dda5c437f0 124 inline int i2c_start(i2c_t *obj) {
mbed_official 133:d4dda5c437f0 125 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 126 int timeout;
mbed_official 133:d4dda5c437f0 127
mbed_official 133:d4dda5c437f0 128 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 129
mbed_official 133:d4dda5c437f0 130 // Clear Acknowledge failure flag
mbed_official 133:d4dda5c437f0 131 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 133:d4dda5c437f0 132
mbed_official 133:d4dda5c437f0 133 // Generate the START condition
mbed_official 133:d4dda5c437f0 134 i2c->CR1 |= I2C_CR1_START;
mbed_official 133:d4dda5c437f0 135
mbed_official 133:d4dda5c437f0 136 // Wait the START condition has been correctly sent
mbed_official 133:d4dda5c437f0 137 timeout = FLAG_TIMEOUT;
mbed_official 133:d4dda5c437f0 138 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 133:d4dda5c437f0 139 if ((timeout--) == 0) {
mbed_official 133:d4dda5c437f0 140 return 1;
mbed_official 133:d4dda5c437f0 141 }
mbed_official 133:d4dda5c437f0 142 }
mbed_official 133:d4dda5c437f0 143
mbed_official 133:d4dda5c437f0 144 return 0;
mbed_official 133:d4dda5c437f0 145 }
mbed_official 133:d4dda5c437f0 146
mbed_official 133:d4dda5c437f0 147 inline int i2c_stop(i2c_t *obj) {
mbed_official 133:d4dda5c437f0 148 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 149
mbed_official 133:d4dda5c437f0 150 // Generate the STOP condition
mbed_official 133:d4dda5c437f0 151 i2c->CR1 |= I2C_CR1_STOP;
mbed_official 133:d4dda5c437f0 152
mbed_official 133:d4dda5c437f0 153 return 0;
mbed_official 133:d4dda5c437f0 154 }
mbed_official 133:d4dda5c437f0 155
mbed_official 227:7bd0639b8911 156 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 242:7074e42da0b2 157 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 242:7074e42da0b2 158 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 242:7074e42da0b2 159 int timeout;
mbed_official 242:7074e42da0b2 160 int count;
mbed_official 242:7074e42da0b2 161 int value;
mbed_official 242:7074e42da0b2 162
mbed_official 133:d4dda5c437f0 163 if (length == 0) return 0;
mbed_official 133:d4dda5c437f0 164
mbed_official 242:7074e42da0b2 165 i2c_start(obj);
mbed_official 242:7074e42da0b2 166
mbed_official 242:7074e42da0b2 167 // Wait until SB flag is set
mbed_official 242:7074e42da0b2 168 timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 169 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 242:7074e42da0b2 170 timeout--;
mbed_official 242:7074e42da0b2 171 if (timeout == 0) {
mbed_official 242:7074e42da0b2 172 return 0;
mbed_official 242:7074e42da0b2 173 }
mbed_official 242:7074e42da0b2 174 }
mbed_official 242:7074e42da0b2 175
mbed_official 242:7074e42da0b2 176 i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
mbed_official 242:7074e42da0b2 177
mbed_official 133:d4dda5c437f0 178
mbed_official 242:7074e42da0b2 179 // Wait address is acknowledged
mbed_official 242:7074e42da0b2 180 timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 181 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 242:7074e42da0b2 182 timeout--;
mbed_official 242:7074e42da0b2 183 if (timeout == 0) {
mbed_official 242:7074e42da0b2 184 return 0;
mbed_official 242:7074e42da0b2 185 }
mbed_official 133:d4dda5c437f0 186 }
mbed_official 242:7074e42da0b2 187 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 242:7074e42da0b2 188
mbed_official 242:7074e42da0b2 189 // Read all bytes except last one
mbed_official 242:7074e42da0b2 190 for (count = 0; count < (length - 1); count++) {
mbed_official 242:7074e42da0b2 191 value = i2c_byte_read(obj, 0);
mbed_official 242:7074e42da0b2 192 data[count] = (char)value;
mbed_official 242:7074e42da0b2 193 }
mbed_official 242:7074e42da0b2 194
mbed_official 242:7074e42da0b2 195 // If not repeated start, send stop.
mbed_official 242:7074e42da0b2 196 // Warning: must be done BEFORE the data is read.
mbed_official 242:7074e42da0b2 197 if (stop) {
mbed_official 242:7074e42da0b2 198 i2c_stop(obj);
mbed_official 242:7074e42da0b2 199 }
mbed_official 242:7074e42da0b2 200
mbed_official 242:7074e42da0b2 201 // Read the last byte
mbed_official 242:7074e42da0b2 202 value = i2c_byte_read(obj, 1);
mbed_official 242:7074e42da0b2 203 data[count] = (char)value;
mbed_official 133:d4dda5c437f0 204
mbed_official 133:d4dda5c437f0 205 return length;
mbed_official 133:d4dda5c437f0 206 }
mbed_official 133:d4dda5c437f0 207
mbed_official 133:d4dda5c437f0 208 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 242:7074e42da0b2 209 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 242:7074e42da0b2 210 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 242:7074e42da0b2 211 int timeout;
mbed_official 242:7074e42da0b2 212 int count;
mbed_official 242:7074e42da0b2 213
mbed_official 133:d4dda5c437f0 214 if (length == 0) return 0;
mbed_official 242:7074e42da0b2 215 i2c_start(obj);
mbed_official 133:d4dda5c437f0 216
mbed_official 242:7074e42da0b2 217 // Wait until SB flag is set
mbed_official 242:7074e42da0b2 218 timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 219 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
mbed_official 242:7074e42da0b2 220 timeout--;
mbed_official 242:7074e42da0b2 221 if (timeout == 0) {
mbed_official 242:7074e42da0b2 222 return 0;
mbed_official 242:7074e42da0b2 223 }
mbed_official 242:7074e42da0b2 224 }
mbed_official 242:7074e42da0b2 225
mbed_official 242:7074e42da0b2 226 i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
mbed_official 242:7074e42da0b2 227
mbed_official 133:d4dda5c437f0 228
mbed_official 242:7074e42da0b2 229 // Wait address is acknowledged
mbed_official 242:7074e42da0b2 230 timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 231 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
mbed_official 242:7074e42da0b2 232 timeout--;
mbed_official 242:7074e42da0b2 233 if (timeout == 0) {
mbed_official 242:7074e42da0b2 234 return 0;
mbed_official 242:7074e42da0b2 235 }
mbed_official 133:d4dda5c437f0 236 }
mbed_official 242:7074e42da0b2 237 __HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
mbed_official 133:d4dda5c437f0 238
mbed_official 242:7074e42da0b2 239 for (count = 0; count < length; count++) {
mbed_official 242:7074e42da0b2 240 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 242:7074e42da0b2 241 i2c_stop(obj);
mbed_official 242:7074e42da0b2 242 return 0;
mbed_official 242:7074e42da0b2 243 }
mbed_official 242:7074e42da0b2 244 }
mbed_official 242:7074e42da0b2 245
mbed_official 242:7074e42da0b2 246 // If not repeated start, send stop.
mbed_official 242:7074e42da0b2 247 if (stop) {
mbed_official 242:7074e42da0b2 248 i2c_stop(obj);
mbed_official 242:7074e42da0b2 249 }
mbed_official 242:7074e42da0b2 250
mbed_official 242:7074e42da0b2 251 return count;
mbed_official 133:d4dda5c437f0 252 }
mbed_official 133:d4dda5c437f0 253
mbed_official 133:d4dda5c437f0 254 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 133:d4dda5c437f0 255 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 256 int timeout;
mbed_official 133:d4dda5c437f0 257
mbed_official 133:d4dda5c437f0 258 if (last) {
mbed_official 133:d4dda5c437f0 259 // Don't acknowledge the last byte
mbed_official 133:d4dda5c437f0 260 i2c->CR1 &= ~I2C_CR1_ACK;
mbed_official 133:d4dda5c437f0 261 } else {
mbed_official 133:d4dda5c437f0 262 // Acknowledge the byte
mbed_official 133:d4dda5c437f0 263 i2c->CR1 |= I2C_CR1_ACK;
mbed_official 133:d4dda5c437f0 264 }
mbed_official 133:d4dda5c437f0 265
mbed_official 133:d4dda5c437f0 266 // Wait until the byte is received
mbed_official 133:d4dda5c437f0 267 timeout = FLAG_TIMEOUT;
mbed_official 133:d4dda5c437f0 268 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 133:d4dda5c437f0 269 if ((timeout--) == 0) {
mbed_official 133:d4dda5c437f0 270 return 0;
mbed_official 133:d4dda5c437f0 271 }
mbed_official 133:d4dda5c437f0 272 }
mbed_official 133:d4dda5c437f0 273
mbed_official 133:d4dda5c437f0 274 return (int)i2c->DR;
mbed_official 133:d4dda5c437f0 275 }
mbed_official 133:d4dda5c437f0 276
mbed_official 133:d4dda5c437f0 277 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 133:d4dda5c437f0 278 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 279 int timeout;
mbed_official 133:d4dda5c437f0 280
mbed_official 133:d4dda5c437f0 281 i2c->DR = (uint8_t)data;
mbed_official 133:d4dda5c437f0 282
mbed_official 133:d4dda5c437f0 283 // Wait until the byte is transmitted
mbed_official 227:7bd0639b8911 284 timeout = FLAG_TIMEOUT;
mbed_official 133:d4dda5c437f0 285 while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
mbed_official 133:d4dda5c437f0 286 (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
mbed_official 133:d4dda5c437f0 287 if ((timeout--) == 0) {
mbed_official 133:d4dda5c437f0 288 return 0;
mbed_official 133:d4dda5c437f0 289 }
mbed_official 133:d4dda5c437f0 290 }
mbed_official 133:d4dda5c437f0 291
mbed_official 133:d4dda5c437f0 292 return 1;
mbed_official 133:d4dda5c437f0 293 }
mbed_official 133:d4dda5c437f0 294
mbed_official 133:d4dda5c437f0 295 void i2c_reset(i2c_t *obj) {
mbed_official 227:7bd0639b8911 296 if (obj->i2c == I2C_1) {
mbed_official 133:d4dda5c437f0 297 __I2C1_FORCE_RESET();
mbed_official 133:d4dda5c437f0 298 __I2C1_RELEASE_RESET();
mbed_official 133:d4dda5c437f0 299 }
mbed_official 133:d4dda5c437f0 300 if (obj->i2c == I2C_2) {
mbed_official 133:d4dda5c437f0 301 __I2C2_FORCE_RESET();
mbed_official 133:d4dda5c437f0 302 __I2C2_RELEASE_RESET();
mbed_official 133:d4dda5c437f0 303 }
mbed_official 133:d4dda5c437f0 304 if (obj->i2c == I2C_3) {
mbed_official 133:d4dda5c437f0 305 __I2C3_FORCE_RESET();
mbed_official 133:d4dda5c437f0 306 __I2C3_RELEASE_RESET();
mbed_official 133:d4dda5c437f0 307 }
mbed_official 133:d4dda5c437f0 308 }
mbed_official 133:d4dda5c437f0 309
mbed_official 133:d4dda5c437f0 310 #if DEVICE_I2CSLAVE
mbed_official 133:d4dda5c437f0 311
mbed_official 133:d4dda5c437f0 312 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 133:d4dda5c437f0 313 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 242:7074e42da0b2 314 uint16_t tmpreg = 0;
mbed_official 133:d4dda5c437f0 315
mbed_official 133:d4dda5c437f0 316 // Get the old register value
mbed_official 133:d4dda5c437f0 317 tmpreg = i2c->OAR1;
mbed_official 133:d4dda5c437f0 318 // Reset address bits
mbed_official 133:d4dda5c437f0 319 tmpreg &= 0xFC00;
mbed_official 133:d4dda5c437f0 320 // Set new address
mbed_official 133:d4dda5c437f0 321 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 133:d4dda5c437f0 322 // Store the new register value
mbed_official 133:d4dda5c437f0 323 i2c->OAR1 = tmpreg;
mbed_official 133:d4dda5c437f0 324 }
mbed_official 133:d4dda5c437f0 325
mbed_official 133:d4dda5c437f0 326 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 242:7074e42da0b2 327 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 242:7074e42da0b2 328 if (enable_slave) {
mbed_official 242:7074e42da0b2 329 obj->slave = 1;
mbed_official 242:7074e42da0b2 330 /* Enable Address Acknowledge */
mbed_official 242:7074e42da0b2 331 I2cHandle.Instance->CR1 |= I2C_CR1_ACK;
mbed_official 242:7074e42da0b2 332 }
mbed_official 133:d4dda5c437f0 333 }
mbed_official 133:d4dda5c437f0 334
mbed_official 133:d4dda5c437f0 335 // See I2CSlave.h
mbed_official 133:d4dda5c437f0 336 #define NoData 0 // the slave has not been addressed
mbed_official 133:d4dda5c437f0 337 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 133:d4dda5c437f0 338 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 133:d4dda5c437f0 339 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 133:d4dda5c437f0 340
mbed_official 133:d4dda5c437f0 341 int i2c_slave_receive(i2c_t *obj) {
mbed_official 242:7074e42da0b2 342 int retValue = NoData;
mbed_official 242:7074e42da0b2 343
mbed_official 242:7074e42da0b2 344 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == 1) {
mbed_official 242:7074e42da0b2 345 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == 1) {
mbed_official 242:7074e42da0b2 346 if (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TRA) == 1)
mbed_official 242:7074e42da0b2 347 retValue = ReadAddressed;
mbed_official 242:7074e42da0b2 348 else
mbed_official 242:7074e42da0b2 349 retValue = WriteAddressed;
mbed_official 242:7074e42da0b2 350
mbed_official 242:7074e42da0b2 351 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_ADDR);
mbed_official 242:7074e42da0b2 352 }
mbed_official 242:7074e42da0b2 353 }
mbed_official 242:7074e42da0b2 354
mbed_official 242:7074e42da0b2 355 return (retValue);
mbed_official 133:d4dda5c437f0 356 }
mbed_official 133:d4dda5c437f0 357
mbed_official 133:d4dda5c437f0 358 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 242:7074e42da0b2 359 uint32_t Timeout;
mbed_official 242:7074e42da0b2 360 int size = 0;
mbed_official 133:d4dda5c437f0 361 if (length == 0) return 0;
mbed_official 133:d4dda5c437f0 362
mbed_official 133:d4dda5c437f0 363 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 364
mbed_official 242:7074e42da0b2 365 while (length > 0) {
mbed_official 242:7074e42da0b2 366 /* Wait until RXNE flag is set */
mbed_official 242:7074e42da0b2 367 // Wait until the byte is received
mbed_official 242:7074e42da0b2 368 Timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 369 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
mbed_official 242:7074e42da0b2 370 Timeout--;
mbed_official 242:7074e42da0b2 371 if (Timeout == 0) {
mbed_official 242:7074e42da0b2 372 return 0;
mbed_official 242:7074e42da0b2 373 }
mbed_official 242:7074e42da0b2 374 }
mbed_official 242:7074e42da0b2 375
mbed_official 242:7074e42da0b2 376 /* Read data from DR */
mbed_official 242:7074e42da0b2 377 (*data++) = I2cHandle.Instance->DR;
mbed_official 242:7074e42da0b2 378 length--;
mbed_official 242:7074e42da0b2 379 size++;
mbed_official 242:7074e42da0b2 380
mbed_official 242:7074e42da0b2 381 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 242:7074e42da0b2 382 /* Read data from DR */
mbed_official 242:7074e42da0b2 383 (*data++) = I2cHandle.Instance->DR;
mbed_official 242:7074e42da0b2 384 length--;
mbed_official 242:7074e42da0b2 385 size++;
mbed_official 242:7074e42da0b2 386 }
mbed_official 133:d4dda5c437f0 387 }
mbed_official 133:d4dda5c437f0 388
mbed_official 242:7074e42da0b2 389 /* Wait until STOP flag is set */
mbed_official 242:7074e42da0b2 390 Timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 391 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_STOPF) == RESET) {
mbed_official 242:7074e42da0b2 392 Timeout--;
mbed_official 242:7074e42da0b2 393 if (Timeout == 0) {
mbed_official 242:7074e42da0b2 394 return 0;
mbed_official 242:7074e42da0b2 395 }
mbed_official 242:7074e42da0b2 396 }
mbed_official 242:7074e42da0b2 397
mbed_official 242:7074e42da0b2 398 /* Clear STOP flag */
mbed_official 242:7074e42da0b2 399 __HAL_I2C_CLEAR_STOPFLAG(&I2cHandle);
mbed_official 242:7074e42da0b2 400
mbed_official 242:7074e42da0b2 401 /* Wait until BUSY flag is reset */
mbed_official 242:7074e42da0b2 402 Timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 403 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 242:7074e42da0b2 404 Timeout--;
mbed_official 242:7074e42da0b2 405 if (Timeout == 0) {
mbed_official 242:7074e42da0b2 406 return 0;
mbed_official 242:7074e42da0b2 407 }
mbed_official 242:7074e42da0b2 408 }
mbed_official 242:7074e42da0b2 409
mbed_official 242:7074e42da0b2 410 return size;
mbed_official 133:d4dda5c437f0 411 }
mbed_official 133:d4dda5c437f0 412
mbed_official 133:d4dda5c437f0 413 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 242:7074e42da0b2 414 uint32_t Timeout;
mbed_official 242:7074e42da0b2 415 int size = 0;
mbed_official 133:d4dda5c437f0 416 if (length == 0) return 0;
mbed_official 133:d4dda5c437f0 417
mbed_official 133:d4dda5c437f0 418 I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
mbed_official 133:d4dda5c437f0 419
mbed_official 242:7074e42da0b2 420 while (length > 0) {
mbed_official 242:7074e42da0b2 421 /* Wait until TXE flag is set */
mbed_official 242:7074e42da0b2 422 Timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 423 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) {
mbed_official 242:7074e42da0b2 424 Timeout--;
mbed_official 242:7074e42da0b2 425 if (Timeout == 0) {
mbed_official 242:7074e42da0b2 426 return 0;
mbed_official 242:7074e42da0b2 427 }
mbed_official 242:7074e42da0b2 428 }
mbed_official 242:7074e42da0b2 429
mbed_official 242:7074e42da0b2 430
mbed_official 242:7074e42da0b2 431 /* Write data to DR */
mbed_official 242:7074e42da0b2 432 I2cHandle.Instance->DR = (*data++);
mbed_official 242:7074e42da0b2 433 length--;
mbed_official 242:7074e42da0b2 434 size++;
mbed_official 242:7074e42da0b2 435
mbed_official 242:7074e42da0b2 436 if ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == SET) && (length != 0)) {
mbed_official 242:7074e42da0b2 437 /* Write data to DR */
mbed_official 242:7074e42da0b2 438 I2cHandle.Instance->DR = (*data++);
mbed_official 242:7074e42da0b2 439 length--;
mbed_official 242:7074e42da0b2 440 size++;
mbed_official 242:7074e42da0b2 441 }
mbed_official 133:d4dda5c437f0 442 }
mbed_official 133:d4dda5c437f0 443
mbed_official 242:7074e42da0b2 444 /* Wait until AF flag is set */
mbed_official 242:7074e42da0b2 445 Timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 446 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_AF) == RESET) {
mbed_official 242:7074e42da0b2 447 Timeout--;
mbed_official 242:7074e42da0b2 448 if (Timeout == 0) {
mbed_official 242:7074e42da0b2 449 return 0;
mbed_official 242:7074e42da0b2 450 }
mbed_official 242:7074e42da0b2 451 }
mbed_official 242:7074e42da0b2 452
mbed_official 242:7074e42da0b2 453
mbed_official 242:7074e42da0b2 454 /* Clear AF flag */
mbed_official 242:7074e42da0b2 455 __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
mbed_official 242:7074e42da0b2 456
mbed_official 242:7074e42da0b2 457
mbed_official 242:7074e42da0b2 458 /* Wait until BUSY flag is reset */
mbed_official 242:7074e42da0b2 459 Timeout = FLAG_TIMEOUT;
mbed_official 242:7074e42da0b2 460 while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BUSY) == SET) {
mbed_official 242:7074e42da0b2 461 Timeout--;
mbed_official 242:7074e42da0b2 462 if (Timeout == 0) {
mbed_official 242:7074e42da0b2 463 return 0;
mbed_official 242:7074e42da0b2 464 }
mbed_official 242:7074e42da0b2 465 }
mbed_official 242:7074e42da0b2 466
mbed_official 242:7074e42da0b2 467 I2cHandle.State = HAL_I2C_STATE_READY;
mbed_official 242:7074e42da0b2 468
mbed_official 242:7074e42da0b2 469 /* Process Unlocked */
mbed_official 242:7074e42da0b2 470 __HAL_UNLOCK(&I2cHandle);
mbed_official 242:7074e42da0b2 471
mbed_official 242:7074e42da0b2 472 return size;
mbed_official 133:d4dda5c437f0 473 }
mbed_official 133:d4dda5c437f0 474
mbed_official 133:d4dda5c437f0 475
mbed_official 133:d4dda5c437f0 476 #endif // DEVICE_I2CSLAVE
mbed_official 133:d4dda5c437f0 477
mbed_official 133:d4dda5c437f0 478 #endif // DEVICE_I2C