Sigve Sebastian Farstad / mbed-src

mbed w/ spi bug fig

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Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F030R8/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:
227:7bd0639b8911 
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 80:66393a7b209d 1 /* mbed Microcontroller Library
mbed_official 80:66393a7b209d 2 *******************************************************************************
mbed_official 80:66393a7b209d 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 80:66393a7b209d 4 * All rights reserved.
mbed_official 80:66393a7b209d 5 *
mbed_official 80:66393a7b209d 6 * Redistribution and use in source and binary forms, with or without
mbed_official 80:66393a7b209d 7 * modification, are permitted provided that the following conditions are met:
mbed_official 80:66393a7b209d 8 *
mbed_official 80:66393a7b209d 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 80:66393a7b209d 10 * this list of conditions and the following disclaimer.
mbed_official 80:66393a7b209d 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 80:66393a7b209d 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 80:66393a7b209d 13 * and/or other materials provided with the distribution.
mbed_official 80:66393a7b209d 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 80:66393a7b209d 15 * may be used to endorse or promote products derived from this software
mbed_official 80:66393a7b209d 16 * without specific prior written permission.
mbed_official 80:66393a7b209d 17 *
mbed_official 80:66393a7b209d 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 80:66393a7b209d 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 80:66393a7b209d 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 80:66393a7b209d 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 80:66393a7b209d 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 80:66393a7b209d 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 80:66393a7b209d 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 80:66393a7b209d 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 80:66393a7b209d 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 80:66393a7b209d 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 80:66393a7b209d 28 *******************************************************************************
mbed_official 80:66393a7b209d 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 80:66393a7b209d 31 #include "i2c_api.h"
mbed_official 80:66393a7b209d 32
mbed_official 80:66393a7b209d 33 #if DEVICE_I2C
mbed_official 80:66393a7b209d 34
mbed_official 80:66393a7b209d 35 #include "cmsis.h"
mbed_official 80:66393a7b209d 36 #include "pinmap.h"
mbed_official 80:66393a7b209d 37
mbed_official 80:66393a7b209d 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 216:577900467c9e 39 not based on accurate values, they just guarantee that the application will
mbed_official 216:577900467c9e 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 80:66393a7b209d 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 80:66393a7b209d 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 80:66393a7b209d 43
mbed_official 80:66393a7b209d 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 171:3d240fda1f07 45 {PB_7, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_1)},
mbed_official 84:f54042cbc282 46 {PB_9, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_1)},
mbed_official 171:3d240fda1f07 47 {PB_11, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_1)},
mbed_official 80:66393a7b209d 48 {NC, NC, 0}
mbed_official 80:66393a7b209d 49 };
mbed_official 80:66393a7b209d 50
mbed_official 80:66393a7b209d 51 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 171:3d240fda1f07 52 {PB_6, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_1)},
mbed_official 84:f54042cbc282 53 {PB_8, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_1)},
mbed_official 171:3d240fda1f07 54 {PB_10, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_1)},
mbed_official 80:66393a7b209d 55 {NC, NC, 0}
mbed_official 80:66393a7b209d 56 };
mbed_official 80:66393a7b209d 57
mbed_official 216:577900467c9e 58 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 80:66393a7b209d 59 // Determine the I2C to use
mbed_official 80:66393a7b209d 60 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 80:66393a7b209d 61 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 80:66393a7b209d 62
mbed_official 80:66393a7b209d 63 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 64 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 80:66393a7b209d 65
mbed_official 80:66393a7b209d 66 // Enable I2C clock
mbed_official 216:577900467c9e 67 if (obj->i2c == I2C_1) {
mbed_official 80:66393a7b209d 68 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 176:2d0c9ad7ef62 69 RCC_I2CCLKConfig(RCC_I2C1CLK_SYSCLK);
mbed_official 80:66393a7b209d 70 }
mbed_official 171:3d240fda1f07 71 if (obj->i2c == I2C_2) {
mbed_official 171:3d240fda1f07 72 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 171:3d240fda1f07 73 }
mbed_official 80:66393a7b209d 74
mbed_official 80:66393a7b209d 75 // Configure I2C pins
mbed_official 84:f54042cbc282 76 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 84:f54042cbc282 77 pin_mode(scl, OpenDrain);
mbed_official 80:66393a7b209d 78 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 80:66393a7b209d 79 pin_mode(sda, OpenDrain);
mbed_official 216:577900467c9e 80
mbed_official 80:66393a7b209d 81 // Reset to clear pending flags if any
mbed_official 80:66393a7b209d 82 i2c_reset(obj);
mbed_official 216:577900467c9e 83
mbed_official 80:66393a7b209d 84 // I2C configuration
mbed_official 216:577900467c9e 85 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 80:66393a7b209d 86 }
mbed_official 80:66393a7b209d 87
mbed_official 80:66393a7b209d 88 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 227:7bd0639b8911 89 MBED_ASSERT((hz == 100000) || (hz == 200000) || (hz == 400000) || (hz == 1000000));
mbed_official 80:66393a7b209d 90 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 80:66393a7b209d 91 I2C_InitTypeDef I2C_InitStructure;
mbed_official 166:cb4253f91ada 92 uint32_t tim = 0;
mbed_official 166:cb4253f91ada 93
mbed_official 166:cb4253f91ada 94 // Disable the Fast Mode Plus capability
mbed_official 166:cb4253f91ada 95 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); // Enable SYSCFG clock
mbed_official 166:cb4253f91ada 96 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, DISABLE);
mbed_official 166:cb4253f91ada 97 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, DISABLE);
mbed_official 216:577900467c9e 98
mbed_official 166:cb4253f91ada 99 /*
mbed_official 166:cb4253f91ada 100 Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
mbed_official 166:cb4253f91ada 101 * Standard mode (up to 100 kHz)
mbed_official 166:cb4253f91ada 102 * Fast Mode (up to 400 kHz)
mbed_official 166:cb4253f91ada 103 * Fast Mode Plus (up to 1 MHz)
mbed_official 166:cb4253f91ada 104 Below values obtained with:
mbed_official 176:2d0c9ad7ef62 105 - I2C clock source = 48 MHz (System Clock)
mbed_official 166:cb4253f91ada 106 - Analog filter delay = ON
mbed_official 166:cb4253f91ada 107 - Digital filter coefficient = 0
mbed_official 166:cb4253f91ada 108 - Rise time = 100 ns
mbed_official 166:cb4253f91ada 109 - Fall time = 10ns
mbed_official 166:cb4253f91ada 110 */
mbed_official 80:66393a7b209d 111 switch (hz) {
mbed_official 227:7bd0639b8911 112 case 100000:
mbed_official 227:7bd0639b8911 113 tim = 0x10805E89; // Standard mode
mbed_official 227:7bd0639b8911 114 break;
mbed_official 227:7bd0639b8911 115 case 200000:
mbed_official 227:7bd0639b8911 116 tim = 0x00905E82; // Fast Mode
mbed_official 227:7bd0639b8911 117 break;
mbed_official 227:7bd0639b8911 118 case 400000:
mbed_official 227:7bd0639b8911 119 tim = 0x00901850; // Fast Mode
mbed_official 227:7bd0639b8911 120 break;
mbed_official 227:7bd0639b8911 121 case 1000000:
mbed_official 227:7bd0639b8911 122 tim = 0x00700818; // Fast Mode Plus
mbed_official 227:7bd0639b8911 123 // Enable the Fast Mode Plus capability
mbed_official 227:7bd0639b8911 124 if (obj->i2c == I2C_1) {
mbed_official 227:7bd0639b8911 125 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, ENABLE);
mbed_official 227:7bd0639b8911 126 }
mbed_official 227:7bd0639b8911 127 if (obj->i2c == I2C_2) {
mbed_official 227:7bd0639b8911 128 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, ENABLE);
mbed_official 227:7bd0639b8911 129 }
mbed_official 227:7bd0639b8911 130 break;
mbed_official 227:7bd0639b8911 131 default:
mbed_official 227:7bd0639b8911 132 break;
mbed_official 80:66393a7b209d 133 }
mbed_official 216:577900467c9e 134
mbed_official 80:66393a7b209d 135 // I2C configuration
mbed_official 166:cb4253f91ada 136 I2C_DeInit(i2c);
mbed_official 80:66393a7b209d 137 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 80:66393a7b209d 138 I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
mbed_official 80:66393a7b209d 139 I2C_InitStructure.I2C_DigitalFilter = 0x00;
mbed_official 80:66393a7b209d 140 I2C_InitStructure.I2C_OwnAddress1 = 0x00;
mbed_official 80:66393a7b209d 141 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 80:66393a7b209d 142 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 166:cb4253f91ada 143 I2C_InitStructure.I2C_Timing = tim;
mbed_official 80:66393a7b209d 144 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 216:577900467c9e 145
mbed_official 80:66393a7b209d 146 I2C_Cmd(i2c, ENABLE);
mbed_official 80:66393a7b209d 147 }
mbed_official 80:66393a7b209d 148
mbed_official 80:66393a7b209d 149 inline int i2c_start(i2c_t *obj) {
mbed_official 80:66393a7b209d 150 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 84:f54042cbc282 151 int timeout;
mbed_official 80:66393a7b209d 152
mbed_official 80:66393a7b209d 153 // Test BUSY Flag
mbed_official 84:f54042cbc282 154 timeout = LONG_TIMEOUT;
mbed_official 84:f54042cbc282 155 while (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) != RESET) {
mbed_official 84:f54042cbc282 156 timeout--;
mbed_official 84:f54042cbc282 157 if (timeout == 0) {
mbed_official 84:f54042cbc282 158 return 0;
mbed_official 84:f54042cbc282 159 }
mbed_official 80:66393a7b209d 160 }
mbed_official 80:66393a7b209d 161
mbed_official 80:66393a7b209d 162 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 80:66393a7b209d 163
mbed_official 80:66393a7b209d 164 return 0;
mbed_official 80:66393a7b209d 165 }
mbed_official 80:66393a7b209d 166
mbed_official 80:66393a7b209d 167 inline int i2c_stop(i2c_t *obj) {
mbed_official 80:66393a7b209d 168 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 216:577900467c9e 169
mbed_official 80:66393a7b209d 170 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 216:577900467c9e 171
mbed_official 80:66393a7b209d 172 return 0;
mbed_official 80:66393a7b209d 173 }
mbed_official 80:66393a7b209d 174
mbed_official 80:66393a7b209d 175 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 80:66393a7b209d 176 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 80:66393a7b209d 177 int count;
mbed_official 197:36a724675865 178 int timeout;
mbed_official 80:66393a7b209d 179 int value;
mbed_official 216:577900467c9e 180
mbed_official 80:66393a7b209d 181 // Configure slave address, nbytes, reload, end mode and start or stop generation
mbed_official 197:36a724675865 182 I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Read);
mbed_official 216:577900467c9e 183
mbed_official 80:66393a7b209d 184 // Read all bytes
mbed_official 80:66393a7b209d 185 for (count = 0; count < length; count++) {
mbed_official 80:66393a7b209d 186 value = i2c_byte_read(obj, 0);
mbed_official 80:66393a7b209d 187 data[count] = (char)value;
mbed_official 80:66393a7b209d 188 }
mbed_official 216:577900467c9e 189
mbed_official 197:36a724675865 190 timeout = FLAG_TIMEOUT;
mbed_official 216:577900467c9e 191 while (!I2C_GetFlagStatus(i2c, I2C_FLAG_TC)) {
mbed_official 197:36a724675865 192 timeout--;
mbed_official 247:135e3186a638 193 if (timeout == 0) return -1;
mbed_official 197:36a724675865 194 }
mbed_official 216:577900467c9e 195
mbed_official 216:577900467c9e 196 if (stop) i2c_stop(obj);
mbed_official 197:36a724675865 197
mbed_official 80:66393a7b209d 198 return length;
mbed_official 80:66393a7b209d 199 }
mbed_official 80:66393a7b209d 200
mbed_official 80:66393a7b209d 201 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 80:66393a7b209d 202 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 197:36a724675865 203 int timeout;
mbed_official 80:66393a7b209d 204 int count;
mbed_official 216:577900467c9e 205
mbed_official 197:36a724675865 206 // Configure slave address, nbytes, reload, end mode and start generation
mbed_official 216:577900467c9e 207 I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
mbed_official 216:577900467c9e 208
mbed_official 80:66393a7b209d 209 // Write all bytes
mbed_official 80:66393a7b209d 210 for (count = 0; count < length; count++) {
mbed_official 197:36a724675865 211 i2c_byte_write(obj, data[count]);
mbed_official 216:577900467c9e 212 }
mbed_official 216:577900467c9e 213
mbed_official 197:36a724675865 214 timeout = FLAG_TIMEOUT;
mbed_official 216:577900467c9e 215 while (!I2C_GetFlagStatus(i2c, I2C_FLAG_TC)) {
mbed_official 197:36a724675865 216 timeout--;
mbed_official 247:135e3186a638 217 if (timeout == 0) return -1;
mbed_official 80:66393a7b209d 218 }
mbed_official 80:66393a7b209d 219
mbed_official 216:577900467c9e 220 if (stop) i2c_stop(obj);
mbed_official 216:577900467c9e 221
mbed_official 80:66393a7b209d 222 return count;
mbed_official 80:66393a7b209d 223 }
mbed_official 80:66393a7b209d 224
mbed_official 80:66393a7b209d 225 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 80:66393a7b209d 226 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 80:66393a7b209d 227 uint8_t data;
mbed_official 84:f54042cbc282 228 int timeout;
mbed_official 216:577900467c9e 229
mbed_official 80:66393a7b209d 230 // Wait until the byte is received
mbed_official 216:577900467c9e 231 timeout = FLAG_TIMEOUT;
mbed_official 80:66393a7b209d 232 while (I2C_GetFlagStatus(i2c, I2C_ISR_RXNE) == RESET) {
mbed_official 84:f54042cbc282 233 timeout--;
mbed_official 84:f54042cbc282 234 if (timeout == 0) {
mbed_official 247:135e3186a638 235 return -1;
mbed_official 84:f54042cbc282 236 }
mbed_official 80:66393a7b209d 237 }
mbed_official 80:66393a7b209d 238
mbed_official 80:66393a7b209d 239 data = I2C_ReceiveData(i2c);
mbed_official 216:577900467c9e 240
mbed_official 80:66393a7b209d 241 return (int)data;
mbed_official 80:66393a7b209d 242 }
mbed_official 80:66393a7b209d 243
mbed_official 80:66393a7b209d 244 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 80:66393a7b209d 245 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 84:f54042cbc282 246 int timeout;
mbed_official 80:66393a7b209d 247
mbed_official 84:f54042cbc282 248 // Wait until the previous byte is transmitted
mbed_official 84:f54042cbc282 249 timeout = FLAG_TIMEOUT;
mbed_official 84:f54042cbc282 250 while (I2C_GetFlagStatus(i2c, I2C_ISR_TXIS) == RESET) {
mbed_official 84:f54042cbc282 251 timeout--;
mbed_official 84:f54042cbc282 252 if (timeout == 0) {
mbed_official 84:f54042cbc282 253 return 0;
mbed_official 84:f54042cbc282 254 }
mbed_official 80:66393a7b209d 255 }
mbed_official 216:577900467c9e 256
mbed_official 80:66393a7b209d 257 I2C_SendData(i2c, (uint8_t)data);
mbed_official 216:577900467c9e 258
mbed_official 80:66393a7b209d 259 return 1;
mbed_official 80:66393a7b209d 260 }
mbed_official 80:66393a7b209d 261
mbed_official 80:66393a7b209d 262 void i2c_reset(i2c_t *obj) {
mbed_official 216:577900467c9e 263 if (obj->i2c == I2C_1) {
mbed_official 80:66393a7b209d 264 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 80:66393a7b209d 265 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 80:66393a7b209d 266 }
mbed_official 171:3d240fda1f07 267 if (obj->i2c == I2C_2) {
mbed_official 171:3d240fda1f07 268 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 216:577900467c9e 269 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 171:3d240fda1f07 270 }
mbed_official 80:66393a7b209d 271 }
mbed_official 80:66393a7b209d 272
mbed_official 80:66393a7b209d 273 #if DEVICE_I2CSLAVE
mbed_official 80:66393a7b209d 274
mbed_official 80:66393a7b209d 275 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 80:66393a7b209d 276 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 80:66393a7b209d 277 uint16_t tmpreg;
mbed_official 216:577900467c9e 278
mbed_official 171:3d240fda1f07 279 // reset own address enable
mbed_official 216:577900467c9e 280 i2c->OAR1 &= ~ I2C_OAR1_OA1EN;
mbed_official 216:577900467c9e 281
mbed_official 80:66393a7b209d 282 // Get the old register value
mbed_official 80:66393a7b209d 283 tmpreg = i2c->OAR1;
mbed_official 80:66393a7b209d 284 // Reset address bits
mbed_official 80:66393a7b209d 285 tmpreg &= 0xFC00;
mbed_official 80:66393a7b209d 286 // Set new address
mbed_official 80:66393a7b209d 287 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 80:66393a7b209d 288 // Store the new register value
mbed_official 171:3d240fda1f07 289 i2c->OAR1 = tmpreg | I2C_OAR1_OA1EN;
mbed_official 80:66393a7b209d 290 }
mbed_official 80:66393a7b209d 291
mbed_official 80:66393a7b209d 292 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 80:66393a7b209d 293 // Nothing to do
mbed_official 80:66393a7b209d 294 }
mbed_official 80:66393a7b209d 295
mbed_official 80:66393a7b209d 296 // See I2CSlave.h
mbed_official 80:66393a7b209d 297 #define NoData 0 // the slave has not been addressed
mbed_official 80:66393a7b209d 298 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 80:66393a7b209d 299 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 80:66393a7b209d 300 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 80:66393a7b209d 301
mbed_official 80:66393a7b209d 302 int i2c_slave_receive(i2c_t *obj) {
mbed_official 171:3d240fda1f07 303 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 176:2d0c9ad7ef62 304 int event = NoData;
mbed_official 216:577900467c9e 305
mbed_official 216:577900467c9e 306 if (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) == SET) {
mbed_official 216:577900467c9e 307 if (I2C_GetFlagStatus(i2c, I2C_ISR_ADDR) == SET) {
mbed_official 216:577900467c9e 308 // Check direction
mbed_official 176:2d0c9ad7ef62 309 if (I2C_GetFlagStatus(i2c, I2C_ISR_DIR) == SET) {
mbed_official 216:577900467c9e 310 event = ReadAddressed;
mbed_official 216:577900467c9e 311 } else event = WriteAddressed;
mbed_official 216:577900467c9e 312 // Clear adress match flag to generate an acknowledge
mbed_official 216:577900467c9e 313 i2c->ICR |= I2C_ICR_ADDRCF;
mbed_official 176:2d0c9ad7ef62 314 }
mbed_official 176:2d0c9ad7ef62 315 }
mbed_official 171:3d240fda1f07 316 return event;
mbed_official 80:66393a7b209d 317 }
mbed_official 80:66393a7b209d 318
mbed_official 80:66393a7b209d 319 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 80:66393a7b209d 320 int count = 0;
mbed_official 216:577900467c9e 321
mbed_official 80:66393a7b209d 322 // Read all bytes
mbed_official 80:66393a7b209d 323 for (count = 0; count < length; count++) {
mbed_official 80:66393a7b209d 324 data[count] = i2c_byte_read(obj, 0);
mbed_official 80:66393a7b209d 325 }
mbed_official 216:577900467c9e 326
mbed_official 80:66393a7b209d 327 return count;
mbed_official 80:66393a7b209d 328 }
mbed_official 80:66393a7b209d 329
mbed_official 80:66393a7b209d 330 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 80:66393a7b209d 331 int count = 0;
mbed_official 216:577900467c9e 332
mbed_official 80:66393a7b209d 333 // Write all bytes
mbed_official 80:66393a7b209d 334 for (count = 0; count < length; count++) {
mbed_official 80:66393a7b209d 335 i2c_byte_write(obj, data[count]);
mbed_official 80:66393a7b209d 336 }
mbed_official 216:577900467c9e 337
mbed_official 80:66393a7b209d 338 return count;
mbed_official 80:66393a7b209d 339 }
mbed_official 80:66393a7b209d 340
mbed_official 80:66393a7b209d 341
mbed_official 80:66393a7b209d 342 #endif // DEVICE_I2CSLAVE
mbed_official 80:66393a7b209d 343
mbed_official 80:66393a7b209d 344 #endif // DEVICE_I2C