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_L152RE/i2c_api.c@174:8bb9f3a33240, 2014-04-29 (annotated)

Committer:
mbed_official
Date:
Tue Apr 29 11:15:07 2014 +0100
Revision:
174:8bb9f3a33240
Parent:
129:0182c99221bc
Child:
190:bde2479eef9e
Synchronized with git revision 5bf985ebc651a2c31cefabd9d62c51dc465ef60a



Full URL: https://github.com/mbedmicro/mbed/commit/5bf985ebc651a2c31cefabd9d62c51dc465ef60a/



[NUCLEO_L152RE/F103RB] Add LSE configuration for RTC

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 76:aeb1df146756 1 /* mbed Microcontroller Library
mbed_official 76:aeb1df146756 2 *******************************************************************************
mbed_official 76:aeb1df146756 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 76:aeb1df146756 4 * All rights reserved.
mbed_official 76:aeb1df146756 5 *
mbed_official 76:aeb1df146756 6 * Redistribution and use in source and binary forms, with or without
mbed_official 76:aeb1df146756 7 * modification, are permitted provided that the following conditions are met:
mbed_official 76:aeb1df146756 8 *
mbed_official 76:aeb1df146756 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 76:aeb1df146756 10 * this list of conditions and the following disclaimer.
mbed_official 76:aeb1df146756 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 76:aeb1df146756 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 76:aeb1df146756 13 * and/or other materials provided with the distribution.
mbed_official 76:aeb1df146756 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 76:aeb1df146756 15 * may be used to endorse or promote products derived from this software
mbed_official 76:aeb1df146756 16 * without specific prior written permission.
mbed_official 76:aeb1df146756 17 *
mbed_official 76:aeb1df146756 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 76:aeb1df146756 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 76:aeb1df146756 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 76:aeb1df146756 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 76:aeb1df146756 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 76:aeb1df146756 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 76:aeb1df146756 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 76:aeb1df146756 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 76:aeb1df146756 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 76:aeb1df146756 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 76:aeb1df146756 28 *******************************************************************************
mbed_official 76:aeb1df146756 29 */
mbed_official 76:aeb1df146756 30 #include "i2c_api.h"
mbed_official 76:aeb1df146756 31
mbed_official 76:aeb1df146756 32 #if DEVICE_I2C
mbed_official 76:aeb1df146756 33
mbed_official 76:aeb1df146756 34 #include "cmsis.h"
mbed_official 76:aeb1df146756 35 #include "pinmap.h"
mbed_official 76:aeb1df146756 36 #include "error.h"
mbed_official 76:aeb1df146756 37
mbed_official 76:aeb1df146756 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 174:8bb9f3a33240 39 not based on accurate values, they just guarantee that the application will
mbed_official 174:8bb9f3a33240 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 76:aeb1df146756 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 76:aeb1df146756 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 76:aeb1df146756 43
mbed_official 76:aeb1df146756 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 118:b44c45162f28 45 {PB_7, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C1)},
mbed_official 80:66393a7b209d 46 {PB_9, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C1)},
mbed_official 118:b44c45162f28 47 {PB_11, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C2)},
mbed_official 76:aeb1df146756 48 {NC, NC, 0}
mbed_official 76:aeb1df146756 49 };
mbed_official 76:aeb1df146756 50
mbed_official 76:aeb1df146756 51 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 118:b44c45162f28 52 {PB_6, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C1)},
mbed_official 80:66393a7b209d 53 {PB_8, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C1)},
mbed_official 118:b44c45162f28 54 {PB_10, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_I2C2)},
mbed_official 76:aeb1df146756 55 {NC, NC, 0}
mbed_official 76:aeb1df146756 56 };
mbed_official 76:aeb1df146756 57
mbed_official 174:8bb9f3a33240 58 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 76:aeb1df146756 59 // Determine the I2C to use
mbed_official 76:aeb1df146756 60 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 76:aeb1df146756 61 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 76:aeb1df146756 62
mbed_official 76:aeb1df146756 63 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 174:8bb9f3a33240 64
mbed_official 76:aeb1df146756 65 if (obj->i2c == (I2CName)NC) {
mbed_official 76:aeb1df146756 66 error("I2C pin mapping failed");
mbed_official 76:aeb1df146756 67 }
mbed_official 76:aeb1df146756 68
mbed_official 76:aeb1df146756 69 // Enable I2C clock
mbed_official 174:8bb9f3a33240 70 if (obj->i2c == I2C_1) {
mbed_official 76:aeb1df146756 71 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 76:aeb1df146756 72 }
mbed_official 76:aeb1df146756 73 if (obj->i2c == I2C_2) {
mbed_official 76:aeb1df146756 74 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 76:aeb1df146756 75 }
mbed_official 76:aeb1df146756 76
mbed_official 76:aeb1df146756 77 // Configure I2C pins
mbed_official 80:66393a7b209d 78 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 80:66393a7b209d 79 pin_mode(scl, OpenDrain);
mbed_official 76:aeb1df146756 80 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 76:aeb1df146756 81 pin_mode(sda, OpenDrain);
mbed_official 174:8bb9f3a33240 82
mbed_official 76:aeb1df146756 83 // Reset to clear pending flags if any
mbed_official 76:aeb1df146756 84 i2c_reset(obj);
mbed_official 174:8bb9f3a33240 85
mbed_official 76:aeb1df146756 86 // I2C configuration
mbed_official 174:8bb9f3a33240 87 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 76:aeb1df146756 88 }
mbed_official 76:aeb1df146756 89
mbed_official 76:aeb1df146756 90 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 76:aeb1df146756 91 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 92 I2C_InitTypeDef I2C_InitStructure;
mbed_official 129:0182c99221bc 93
mbed_official 129:0182c99221bc 94 if (hz == 0) return;
mbed_official 129:0182c99221bc 95 if (hz > 400000) hz = 400000;
mbed_official 129:0182c99221bc 96
mbed_official 129:0182c99221bc 97 /* Warning: To use the I2C at 400 kHz (in fast mode), the PCLK1 frequency
mbed_official 129:0182c99221bc 98 (I2C peripheral input clock) must be a multiple of 10 MHz.
mbed_official 129:0182c99221bc 99 With the actual clock configuration, the max frequency is measured at 296 kHz */
mbed_official 174:8bb9f3a33240 100
mbed_official 129:0182c99221bc 101 // I2C configuration
mbed_official 129:0182c99221bc 102 I2C_DeInit(i2c);
mbed_official 129:0182c99221bc 103 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 129:0182c99221bc 104 I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
mbed_official 129:0182c99221bc 105 I2C_InitStructure.I2C_OwnAddress1 = 0;
mbed_official 129:0182c99221bc 106 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 129:0182c99221bc 107 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 129:0182c99221bc 108 I2C_InitStructure.I2C_ClockSpeed = hz;
mbed_official 129:0182c99221bc 109 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 129:0182c99221bc 110 I2C_Cmd(i2c, ENABLE);
mbed_official 76:aeb1df146756 111 }
mbed_official 76:aeb1df146756 112
mbed_official 76:aeb1df146756 113 inline int i2c_start(i2c_t *obj) {
mbed_official 76:aeb1df146756 114 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 115 int timeout;
mbed_official 174:8bb9f3a33240 116
mbed_official 76:aeb1df146756 117 I2C_ClearFlag(i2c, I2C_FLAG_AF); // Clear Acknowledge failure flag
mbed_official 174:8bb9f3a33240 118
mbed_official 76:aeb1df146756 119 // Generate the START condition
mbed_official 174:8bb9f3a33240 120 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 174:8bb9f3a33240 121
mbed_official 76:aeb1df146756 122 // Wait the START condition has been correctly sent
mbed_official 76:aeb1df146756 123 timeout = FLAG_TIMEOUT;
mbed_official 76:aeb1df146756 124 while (I2C_GetFlagStatus(i2c, I2C_FLAG_SB) == RESET) {
mbed_official 80:66393a7b209d 125 timeout--;
mbed_official 80:66393a7b209d 126 if (timeout == 0) {
mbed_official 80:66393a7b209d 127 return 1;
mbed_official 80:66393a7b209d 128 }
mbed_official 76:aeb1df146756 129 }
mbed_official 174:8bb9f3a33240 130
mbed_official 76:aeb1df146756 131 return 0;
mbed_official 76:aeb1df146756 132 }
mbed_official 76:aeb1df146756 133
mbed_official 76:aeb1df146756 134 inline int i2c_stop(i2c_t *obj) {
mbed_official 76:aeb1df146756 135 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 129:0182c99221bc 136 int timeout;
mbed_official 129:0182c99221bc 137 volatile int temp;
mbed_official 174:8bb9f3a33240 138
mbed_official 129:0182c99221bc 139 if (I2C_GetFlagStatus(i2c, I2C_FLAG_MSL) == RESET) {
mbed_official 129:0182c99221bc 140 timeout = LONG_TIMEOUT;
mbed_official 174:8bb9f3a33240 141 // wait for STOP
mbed_official 129:0182c99221bc 142 while (I2C_GetFlagStatus(i2c, I2C_FLAG_STOPF) == RESET) {
mbed_official 129:0182c99221bc 143 timeout--;
mbed_official 129:0182c99221bc 144 if (timeout == 0) {
mbed_official 129:0182c99221bc 145 return 0;
mbed_official 129:0182c99221bc 146 }
mbed_official 129:0182c99221bc 147 }
mbed_official 129:0182c99221bc 148 temp = i2c->SR1;
mbed_official 129:0182c99221bc 149 I2C_Cmd(i2c, ENABLE);
mbed_official 174:8bb9f3a33240 150 } else {
mbed_official 129:0182c99221bc 151 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 129:0182c99221bc 152 }
mbed_official 174:8bb9f3a33240 153
mbed_official 76:aeb1df146756 154 return 0;
mbed_official 76:aeb1df146756 155 }
mbed_official 76:aeb1df146756 156
mbed_official 76:aeb1df146756 157 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 76:aeb1df146756 158 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 159 int timeout;
mbed_official 76:aeb1df146756 160 int count;
mbed_official 76:aeb1df146756 161 int value;
mbed_official 174:8bb9f3a33240 162
mbed_official 76:aeb1df146756 163 if (length == 0) return 0;
mbed_official 76:aeb1df146756 164
mbed_official 76:aeb1df146756 165 i2c_start(obj);
mbed_official 76:aeb1df146756 166
mbed_official 76:aeb1df146756 167 // Send slave address for read
mbed_official 174:8bb9f3a33240 168 I2C_Send7bitAddress(i2c, address, I2C_Direction_Receiver);
mbed_official 76:aeb1df146756 169
mbed_official 76:aeb1df146756 170 // Wait address is acknowledged
mbed_official 76:aeb1df146756 171 timeout = FLAG_TIMEOUT;
mbed_official 76:aeb1df146756 172 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) == ERROR) {
mbed_official 80:66393a7b209d 173 timeout--;
mbed_official 80:66393a7b209d 174 if (timeout == 0) {
mbed_official 80:66393a7b209d 175 return 0;
mbed_official 80:66393a7b209d 176 }
mbed_official 76:aeb1df146756 177 }
mbed_official 174:8bb9f3a33240 178
mbed_official 76:aeb1df146756 179 // Read all bytes except last one
mbed_official 76:aeb1df146756 180 for (count = 0; count < (length - 1); count++) {
mbed_official 76:aeb1df146756 181 value = i2c_byte_read(obj, 0);
mbed_official 76:aeb1df146756 182 data[count] = (char)value;
mbed_official 76:aeb1df146756 183 }
mbed_official 174:8bb9f3a33240 184
mbed_official 76:aeb1df146756 185 // If not repeated start, send stop.
mbed_official 76:aeb1df146756 186 // Warning: must be done BEFORE the data is read.
mbed_official 76:aeb1df146756 187 if (stop) {
mbed_official 76:aeb1df146756 188 i2c_stop(obj);
mbed_official 76:aeb1df146756 189 }
mbed_official 76:aeb1df146756 190
mbed_official 76:aeb1df146756 191 // Read the last byte
mbed_official 76:aeb1df146756 192 value = i2c_byte_read(obj, 1);
mbed_official 76:aeb1df146756 193 data[count] = (char)value;
mbed_official 174:8bb9f3a33240 194
mbed_official 76:aeb1df146756 195 return length;
mbed_official 76:aeb1df146756 196 }
mbed_official 76:aeb1df146756 197
mbed_official 76:aeb1df146756 198 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 76:aeb1df146756 199 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 200 int timeout;
mbed_official 76:aeb1df146756 201 int count;
mbed_official 76:aeb1df146756 202
mbed_official 76:aeb1df146756 203 i2c_start(obj);
mbed_official 76:aeb1df146756 204
mbed_official 76:aeb1df146756 205 // Send slave address for write
mbed_official 76:aeb1df146756 206 I2C_Send7bitAddress(i2c, address, I2C_Direction_Transmitter);
mbed_official 174:8bb9f3a33240 207
mbed_official 76:aeb1df146756 208 // Wait address is acknowledged
mbed_official 76:aeb1df146756 209 timeout = FLAG_TIMEOUT;
mbed_official 76:aeb1df146756 210 while (I2C_CheckEvent(i2c, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) == ERROR) {
mbed_official 80:66393a7b209d 211 timeout--;
mbed_official 80:66393a7b209d 212 if (timeout == 0) {
mbed_official 80:66393a7b209d 213 return 0;
mbed_official 80:66393a7b209d 214 }
mbed_official 76:aeb1df146756 215 }
mbed_official 76:aeb1df146756 216
mbed_official 76:aeb1df146756 217 for (count = 0; count < length; count++) {
mbed_official 76:aeb1df146756 218 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 76:aeb1df146756 219 i2c_stop(obj);
mbed_official 76:aeb1df146756 220 return 0;
mbed_official 76:aeb1df146756 221 }
mbed_official 76:aeb1df146756 222 }
mbed_official 76:aeb1df146756 223
mbed_official 76:aeb1df146756 224 // If not repeated start, send stop.
mbed_official 76:aeb1df146756 225 if (stop) {
mbed_official 76:aeb1df146756 226 i2c_stop(obj);
mbed_official 76:aeb1df146756 227 }
mbed_official 76:aeb1df146756 228
mbed_official 76:aeb1df146756 229 return count;
mbed_official 76:aeb1df146756 230 }
mbed_official 76:aeb1df146756 231
mbed_official 76:aeb1df146756 232 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 76:aeb1df146756 233 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 234 uint8_t data;
mbed_official 76:aeb1df146756 235 int timeout;
mbed_official 174:8bb9f3a33240 236
mbed_official 76:aeb1df146756 237 if (last) {
mbed_official 76:aeb1df146756 238 // Don't acknowledge the last byte
mbed_official 76:aeb1df146756 239 I2C_AcknowledgeConfig(i2c, DISABLE);
mbed_official 76:aeb1df146756 240 } else {
mbed_official 76:aeb1df146756 241 // Acknowledge the byte
mbed_official 76:aeb1df146756 242 I2C_AcknowledgeConfig(i2c, ENABLE);
mbed_official 76:aeb1df146756 243 }
mbed_official 76:aeb1df146756 244
mbed_official 76:aeb1df146756 245 // Wait until the byte is received
mbed_official 76:aeb1df146756 246 timeout = FLAG_TIMEOUT;
mbed_official 76:aeb1df146756 247 while (I2C_GetFlagStatus(i2c, I2C_FLAG_RXNE) == RESET) {
mbed_official 80:66393a7b209d 248 timeout--;
mbed_official 80:66393a7b209d 249 if (timeout == 0) {
mbed_official 80:66393a7b209d 250 return 0;
mbed_official 80:66393a7b209d 251 }
mbed_official 76:aeb1df146756 252 }
mbed_official 76:aeb1df146756 253
mbed_official 76:aeb1df146756 254 data = I2C_ReceiveData(i2c);
mbed_official 174:8bb9f3a33240 255
mbed_official 76:aeb1df146756 256 return (int)data;
mbed_official 76:aeb1df146756 257 }
mbed_official 76:aeb1df146756 258
mbed_official 76:aeb1df146756 259 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 76:aeb1df146756 260 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 261 int timeout;
mbed_official 76:aeb1df146756 262
mbed_official 76:aeb1df146756 263 I2C_SendData(i2c, (uint8_t)data);
mbed_official 76:aeb1df146756 264
mbed_official 76:aeb1df146756 265 // Wait until the byte is transmitted
mbed_official 129:0182c99221bc 266 timeout = FLAG_TIMEOUT;
mbed_official 76:aeb1df146756 267 while ((I2C_GetFlagStatus(i2c, I2C_FLAG_TXE) == RESET) &&
mbed_official 174:8bb9f3a33240 268 (I2C_GetFlagStatus(i2c, I2C_FLAG_BTF) == RESET)) {
mbed_official 80:66393a7b209d 269 timeout--;
mbed_official 80:66393a7b209d 270 if (timeout == 0) {
mbed_official 76:aeb1df146756 271 return 0;
mbed_official 76:aeb1df146756 272 }
mbed_official 76:aeb1df146756 273 }
mbed_official 174:8bb9f3a33240 274
mbed_official 76:aeb1df146756 275 return 1;
mbed_official 76:aeb1df146756 276 }
mbed_official 76:aeb1df146756 277
mbed_official 76:aeb1df146756 278 void i2c_reset(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 279 if (obj->i2c == I2C_1) {
mbed_official 76:aeb1df146756 280 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 76:aeb1df146756 281 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 76:aeb1df146756 282 }
mbed_official 76:aeb1df146756 283 if (obj->i2c == I2C_2) {
mbed_official 76:aeb1df146756 284 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 174:8bb9f3a33240 285 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 76:aeb1df146756 286 }
mbed_official 76:aeb1df146756 287 }
mbed_official 76:aeb1df146756 288
mbed_official 76:aeb1df146756 289 #if DEVICE_I2CSLAVE
mbed_official 76:aeb1df146756 290
mbed_official 76:aeb1df146756 291 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 76:aeb1df146756 292 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 76:aeb1df146756 293 uint16_t tmpreg;
mbed_official 174:8bb9f3a33240 294
mbed_official 76:aeb1df146756 295 // Get the old register value
mbed_official 76:aeb1df146756 296 tmpreg = i2c->OAR1;
mbed_official 76:aeb1df146756 297 // Reset address bits
mbed_official 76:aeb1df146756 298 tmpreg &= 0xFC00;
mbed_official 76:aeb1df146756 299 // Set new address
mbed_official 76:aeb1df146756 300 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 76:aeb1df146756 301 // Store the new register value
mbed_official 76:aeb1df146756 302 i2c->OAR1 = tmpreg;
mbed_official 76:aeb1df146756 303 }
mbed_official 76:aeb1df146756 304
mbed_official 76:aeb1df146756 305 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 76:aeb1df146756 306 // Nothing to do
mbed_official 76:aeb1df146756 307 }
mbed_official 76:aeb1df146756 308
mbed_official 76:aeb1df146756 309 // See I2CSlave.h
mbed_official 76:aeb1df146756 310 #define NoData 0 // the slave has not been addressed
mbed_official 76:aeb1df146756 311 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 76:aeb1df146756 312 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 76:aeb1df146756 313 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 76:aeb1df146756 314
mbed_official 76:aeb1df146756 315 int i2c_slave_receive(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 316 return (0);
mbed_official 76:aeb1df146756 317 }
mbed_official 76:aeb1df146756 318
mbed_official 76:aeb1df146756 319 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 76:aeb1df146756 320 int count = 0;
mbed_official 174:8bb9f3a33240 321
mbed_official 76:aeb1df146756 322 // Read all bytes
mbed_official 76:aeb1df146756 323 for (count = 0; count < length; count++) {
mbed_official 76:aeb1df146756 324 data[count] = i2c_byte_read(obj, 0);
mbed_official 76:aeb1df146756 325 }
mbed_official 174:8bb9f3a33240 326
mbed_official 76:aeb1df146756 327 return count;
mbed_official 76:aeb1df146756 328 }
mbed_official 76:aeb1df146756 329
mbed_official 76:aeb1df146756 330 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 76:aeb1df146756 331 int count = 0;
mbed_official 174:8bb9f3a33240 332
mbed_official 76:aeb1df146756 333 // Write all bytes
mbed_official 76:aeb1df146756 334 for (count = 0; count < length; count++) {
mbed_official 76:aeb1df146756 335 i2c_byte_write(obj, data[count]);
mbed_official 76:aeb1df146756 336 }
mbed_official 174:8bb9f3a33240 337
mbed_official 76:aeb1df146756 338 return count;
mbed_official 76:aeb1df146756 339 }
mbed_official 76:aeb1df146756 340
mbed_official 76:aeb1df146756 341
mbed_official 76:aeb1df146756 342 #endif // DEVICE_I2CSLAVE
mbed_official 76:aeb1df146756 343
mbed_official 76:aeb1df146756 344 #endif // DEVICE_I2C