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_F030R8/i2c_api.c@216:577900467c9e, 2014-05-27 (annotated)

Committer:
mbed_official
Date:
Tue May 27 10:00:08 2014 +0100
Revision:
216:577900467c9e
Parent:
197:36a724675865
Child:
227:7bd0639b8911
Synchronized with git revision 1cdfe81b13a631cf282176dd176df20a6ebbc297



Full URL: https://github.com/mbedmicro/mbed/commit/1cdfe81b13a631cf282176dd176df20a6ebbc297/



[NUCLEO_xxx] Update xxx_free() functions + typo

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 80:66393a7b209d 30 #include "i2c_api.h"
mbed_official 80:66393a7b209d 31
mbed_official 80:66393a7b209d 32 #if DEVICE_I2C
mbed_official 80:66393a7b209d 33
mbed_official 80:66393a7b209d 34 #include "cmsis.h"
mbed_official 80:66393a7b209d 35 #include "pinmap.h"
mbed_official 80:66393a7b209d 36 #include "error.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 216:577900467c9e 64
mbed_official 80:66393a7b209d 65 if (obj->i2c == (I2CName)NC) {
mbed_official 80:66393a7b209d 66 error("I2C pin mapping failed");
mbed_official 80:66393a7b209d 67 }
mbed_official 80:66393a7b209d 68
mbed_official 80:66393a7b209d 69 // Enable I2C clock
mbed_official 216:577900467c9e 70 if (obj->i2c == I2C_1) {
mbed_official 80:66393a7b209d 71 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 176:2d0c9ad7ef62 72 RCC_I2CCLKConfig(RCC_I2C1CLK_SYSCLK);
mbed_official 80:66393a7b209d 73 }
mbed_official 171:3d240fda1f07 74 if (obj->i2c == I2C_2) {
mbed_official 171:3d240fda1f07 75 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 171:3d240fda1f07 76 }
mbed_official 80:66393a7b209d 77
mbed_official 80:66393a7b209d 78 // Configure I2C pins
mbed_official 84:f54042cbc282 79 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 84:f54042cbc282 80 pin_mode(scl, OpenDrain);
mbed_official 80:66393a7b209d 81 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 80:66393a7b209d 82 pin_mode(sda, OpenDrain);
mbed_official 216:577900467c9e 83
mbed_official 80:66393a7b209d 84 // Reset to clear pending flags if any
mbed_official 80:66393a7b209d 85 i2c_reset(obj);
mbed_official 216:577900467c9e 86
mbed_official 80:66393a7b209d 87 // I2C configuration
mbed_official 216:577900467c9e 88 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 80:66393a7b209d 89 }
mbed_official 80:66393a7b209d 90
mbed_official 80:66393a7b209d 91 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 80:66393a7b209d 92 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 80:66393a7b209d 93 I2C_InitTypeDef I2C_InitStructure;
mbed_official 166:cb4253f91ada 94 uint32_t tim = 0;
mbed_official 166:cb4253f91ada 95
mbed_official 166:cb4253f91ada 96 // Disable the Fast Mode Plus capability
mbed_official 166:cb4253f91ada 97 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); // Enable SYSCFG clock
mbed_official 166:cb4253f91ada 98 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, DISABLE);
mbed_official 166:cb4253f91ada 99 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, DISABLE);
mbed_official 216:577900467c9e 100
mbed_official 166:cb4253f91ada 101 /*
mbed_official 166:cb4253f91ada 102 Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
mbed_official 166:cb4253f91ada 103 * Standard mode (up to 100 kHz)
mbed_official 166:cb4253f91ada 104 * Fast Mode (up to 400 kHz)
mbed_official 166:cb4253f91ada 105 * Fast Mode Plus (up to 1 MHz)
mbed_official 166:cb4253f91ada 106 Below values obtained with:
mbed_official 176:2d0c9ad7ef62 107 - I2C clock source = 48 MHz (System Clock)
mbed_official 166:cb4253f91ada 108 - Analog filter delay = ON
mbed_official 166:cb4253f91ada 109 - Digital filter coefficient = 0
mbed_official 166:cb4253f91ada 110 - Rise time = 100 ns
mbed_official 166:cb4253f91ada 111 - Fall time = 10ns
mbed_official 166:cb4253f91ada 112 */
mbed_official 80:66393a7b209d 113 switch (hz) {
mbed_official 216:577900467c9e 114 case 100000:
mbed_official 216:577900467c9e 115 tim = 0x10805E89; // Standard mode
mbed_official 216:577900467c9e 116 break;
mbed_official 216:577900467c9e 117 case 200000:
mbed_official 216:577900467c9e 118 tim = 0x00905E82; // Fast Mode
mbed_official 216:577900467c9e 119 break;
mbed_official 216:577900467c9e 120 case 400000:
mbed_official 216:577900467c9e 121 tim = 0x00901850; // Fast Mode
mbed_official 216:577900467c9e 122 break;
mbed_official 216:577900467c9e 123 case 1000000:
mbed_official 216:577900467c9e 124 tim = 0x00700818; // Fast Mode Plus
mbed_official 216:577900467c9e 125 // Enable the Fast Mode Plus capability
mbed_official 216:577900467c9e 126 if (obj->i2c == I2C_1) {
mbed_official 216:577900467c9e 127 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, ENABLE);
mbed_official 216:577900467c9e 128 }
mbed_official 216:577900467c9e 129 if (obj->i2c == I2C_2) {
mbed_official 216:577900467c9e 130 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, ENABLE);
mbed_official 216:577900467c9e 131 }
mbed_official 216:577900467c9e 132 break;
mbed_official 216:577900467c9e 133 default:
mbed_official 216:577900467c9e 134 error("Only 100kHz, 200kHz, 400kHz and 1MHz I2C frequencies are supported.");
mbed_official 216:577900467c9e 135 break;
mbed_official 80:66393a7b209d 136 }
mbed_official 216:577900467c9e 137
mbed_official 80:66393a7b209d 138 // I2C configuration
mbed_official 166:cb4253f91ada 139 I2C_DeInit(i2c);
mbed_official 80:66393a7b209d 140 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 80:66393a7b209d 141 I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
mbed_official 80:66393a7b209d 142 I2C_InitStructure.I2C_DigitalFilter = 0x00;
mbed_official 80:66393a7b209d 143 I2C_InitStructure.I2C_OwnAddress1 = 0x00;
mbed_official 80:66393a7b209d 144 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 80:66393a7b209d 145 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 166:cb4253f91ada 146 I2C_InitStructure.I2C_Timing = tim;
mbed_official 80:66393a7b209d 147 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 216:577900467c9e 148
mbed_official 80:66393a7b209d 149 I2C_Cmd(i2c, ENABLE);
mbed_official 80:66393a7b209d 150 }
mbed_official 80:66393a7b209d 151
mbed_official 80:66393a7b209d 152 inline int i2c_start(i2c_t *obj) {
mbed_official 80:66393a7b209d 153 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 84:f54042cbc282 154 int timeout;
mbed_official 80:66393a7b209d 155
mbed_official 80:66393a7b209d 156 // Test BUSY Flag
mbed_official 84:f54042cbc282 157 timeout = LONG_TIMEOUT;
mbed_official 84:f54042cbc282 158 while (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) != RESET) {
mbed_official 84:f54042cbc282 159 timeout--;
mbed_official 84:f54042cbc282 160 if (timeout == 0) {
mbed_official 84:f54042cbc282 161 return 0;
mbed_official 84:f54042cbc282 162 }
mbed_official 80:66393a7b209d 163 }
mbed_official 80:66393a7b209d 164
mbed_official 80:66393a7b209d 165 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 80:66393a7b209d 166
mbed_official 80:66393a7b209d 167 return 0;
mbed_official 80:66393a7b209d 168 }
mbed_official 80:66393a7b209d 169
mbed_official 80:66393a7b209d 170 inline int i2c_stop(i2c_t *obj) {
mbed_official 80:66393a7b209d 171 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 216:577900467c9e 172
mbed_official 80:66393a7b209d 173 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 216:577900467c9e 174
mbed_official 80:66393a7b209d 175 return 0;
mbed_official 80:66393a7b209d 176 }
mbed_official 80:66393a7b209d 177
mbed_official 80:66393a7b209d 178 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 80:66393a7b209d 179 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 80:66393a7b209d 180 int count;
mbed_official 197:36a724675865 181 int timeout;
mbed_official 80:66393a7b209d 182 int value;
mbed_official 216:577900467c9e 183
mbed_official 80:66393a7b209d 184 if (length == 0) return 0;
mbed_official 80:66393a7b209d 185
mbed_official 80:66393a7b209d 186 // Configure slave address, nbytes, reload, end mode and start or stop generation
mbed_official 197:36a724675865 187 I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Read);
mbed_official 216:577900467c9e 188
mbed_official 80:66393a7b209d 189 // Read all bytes
mbed_official 80:66393a7b209d 190 for (count = 0; count < length; count++) {
mbed_official 80:66393a7b209d 191 value = i2c_byte_read(obj, 0);
mbed_official 80:66393a7b209d 192 data[count] = (char)value;
mbed_official 80:66393a7b209d 193 }
mbed_official 216:577900467c9e 194
mbed_official 197:36a724675865 195 timeout = FLAG_TIMEOUT;
mbed_official 216:577900467c9e 196 while (!I2C_GetFlagStatus(i2c, I2C_FLAG_TC)) {
mbed_official 197:36a724675865 197 timeout--;
mbed_official 197:36a724675865 198 if (timeout == 0) return 0;
mbed_official 197:36a724675865 199 }
mbed_official 216:577900467c9e 200
mbed_official 216:577900467c9e 201 if (stop) i2c_stop(obj);
mbed_official 197:36a724675865 202
mbed_official 80:66393a7b209d 203 return length;
mbed_official 80:66393a7b209d 204 }
mbed_official 80:66393a7b209d 205
mbed_official 80:66393a7b209d 206 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 80:66393a7b209d 207 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 197:36a724675865 208 int timeout;
mbed_official 80:66393a7b209d 209 int count;
mbed_official 216:577900467c9e 210
mbed_official 84:f54042cbc282 211 if (length == 0) return 0;
mbed_official 80:66393a7b209d 212
mbed_official 197:36a724675865 213 // Configure slave address, nbytes, reload, end mode and start generation
mbed_official 216:577900467c9e 214 I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
mbed_official 216:577900467c9e 215
mbed_official 80:66393a7b209d 216 // Write all bytes
mbed_official 80:66393a7b209d 217 for (count = 0; count < length; count++) {
mbed_official 197:36a724675865 218 i2c_byte_write(obj, data[count]);
mbed_official 216:577900467c9e 219 }
mbed_official 216:577900467c9e 220
mbed_official 197:36a724675865 221 timeout = FLAG_TIMEOUT;
mbed_official 216:577900467c9e 222 while (!I2C_GetFlagStatus(i2c, I2C_FLAG_TC)) {
mbed_official 197:36a724675865 223 timeout--;
mbed_official 197:36a724675865 224 if (timeout == 0) return 0;
mbed_official 80:66393a7b209d 225 }
mbed_official 80:66393a7b209d 226
mbed_official 216:577900467c9e 227 if (stop) i2c_stop(obj);
mbed_official 216:577900467c9e 228
mbed_official 80:66393a7b209d 229 return count;
mbed_official 80:66393a7b209d 230 }
mbed_official 80:66393a7b209d 231
mbed_official 80:66393a7b209d 232 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 80:66393a7b209d 233 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 80:66393a7b209d 234 uint8_t data;
mbed_official 84:f54042cbc282 235 int timeout;
mbed_official 216:577900467c9e 236
mbed_official 80:66393a7b209d 237 // Wait until the byte is received
mbed_official 216:577900467c9e 238 timeout = FLAG_TIMEOUT;
mbed_official 80:66393a7b209d 239 while (I2C_GetFlagStatus(i2c, I2C_ISR_RXNE) == RESET) {
mbed_official 84:f54042cbc282 240 timeout--;
mbed_official 84:f54042cbc282 241 if (timeout == 0) {
mbed_official 84:f54042cbc282 242 return 0;
mbed_official 84:f54042cbc282 243 }
mbed_official 80:66393a7b209d 244 }
mbed_official 80:66393a7b209d 245
mbed_official 80:66393a7b209d 246 data = I2C_ReceiveData(i2c);
mbed_official 216:577900467c9e 247
mbed_official 80:66393a7b209d 248 return (int)data;
mbed_official 80:66393a7b209d 249 }
mbed_official 80:66393a7b209d 250
mbed_official 80:66393a7b209d 251 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 80:66393a7b209d 252 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 84:f54042cbc282 253 int timeout;
mbed_official 80:66393a7b209d 254
mbed_official 84:f54042cbc282 255 // Wait until the previous byte is transmitted
mbed_official 84:f54042cbc282 256 timeout = FLAG_TIMEOUT;
mbed_official 84:f54042cbc282 257 while (I2C_GetFlagStatus(i2c, I2C_ISR_TXIS) == RESET) {
mbed_official 84:f54042cbc282 258 timeout--;
mbed_official 84:f54042cbc282 259 if (timeout == 0) {
mbed_official 84:f54042cbc282 260 return 0;
mbed_official 84:f54042cbc282 261 }
mbed_official 80:66393a7b209d 262 }
mbed_official 216:577900467c9e 263
mbed_official 80:66393a7b209d 264 I2C_SendData(i2c, (uint8_t)data);
mbed_official 216:577900467c9e 265
mbed_official 80:66393a7b209d 266 return 1;
mbed_official 80:66393a7b209d 267 }
mbed_official 80:66393a7b209d 268
mbed_official 80:66393a7b209d 269 void i2c_reset(i2c_t *obj) {
mbed_official 216:577900467c9e 270 if (obj->i2c == I2C_1) {
mbed_official 80:66393a7b209d 271 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 80:66393a7b209d 272 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 80:66393a7b209d 273 }
mbed_official 171:3d240fda1f07 274 if (obj->i2c == I2C_2) {
mbed_official 171:3d240fda1f07 275 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 216:577900467c9e 276 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 171:3d240fda1f07 277 }
mbed_official 80:66393a7b209d 278 }
mbed_official 80:66393a7b209d 279
mbed_official 80:66393a7b209d 280 #if DEVICE_I2CSLAVE
mbed_official 80:66393a7b209d 281
mbed_official 80:66393a7b209d 282 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 80:66393a7b209d 283 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 80:66393a7b209d 284 uint16_t tmpreg;
mbed_official 216:577900467c9e 285
mbed_official 171:3d240fda1f07 286 // reset own address enable
mbed_official 216:577900467c9e 287 i2c->OAR1 &= ~ I2C_OAR1_OA1EN;
mbed_official 216:577900467c9e 288
mbed_official 80:66393a7b209d 289 // Get the old register value
mbed_official 80:66393a7b209d 290 tmpreg = i2c->OAR1;
mbed_official 80:66393a7b209d 291 // Reset address bits
mbed_official 80:66393a7b209d 292 tmpreg &= 0xFC00;
mbed_official 80:66393a7b209d 293 // Set new address
mbed_official 80:66393a7b209d 294 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 80:66393a7b209d 295 // Store the new register value
mbed_official 171:3d240fda1f07 296 i2c->OAR1 = tmpreg | I2C_OAR1_OA1EN;
mbed_official 80:66393a7b209d 297 }
mbed_official 80:66393a7b209d 298
mbed_official 80:66393a7b209d 299 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 80:66393a7b209d 300 // Nothing to do
mbed_official 80:66393a7b209d 301 }
mbed_official 80:66393a7b209d 302
mbed_official 80:66393a7b209d 303 // See I2CSlave.h
mbed_official 80:66393a7b209d 304 #define NoData 0 // the slave has not been addressed
mbed_official 80:66393a7b209d 305 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 80:66393a7b209d 306 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 80:66393a7b209d 307 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 80:66393a7b209d 308
mbed_official 80:66393a7b209d 309 int i2c_slave_receive(i2c_t *obj) {
mbed_official 171:3d240fda1f07 310 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 176:2d0c9ad7ef62 311 int event = NoData;
mbed_official 216:577900467c9e 312
mbed_official 216:577900467c9e 313 if (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) == SET) {
mbed_official 216:577900467c9e 314 if (I2C_GetFlagStatus(i2c, I2C_ISR_ADDR) == SET) {
mbed_official 216:577900467c9e 315 // Check direction
mbed_official 176:2d0c9ad7ef62 316 if (I2C_GetFlagStatus(i2c, I2C_ISR_DIR) == SET) {
mbed_official 216:577900467c9e 317 event = ReadAddressed;
mbed_official 216:577900467c9e 318 } else event = WriteAddressed;
mbed_official 216:577900467c9e 319 // Clear adress match flag to generate an acknowledge
mbed_official 216:577900467c9e 320 i2c->ICR |= I2C_ICR_ADDRCF;
mbed_official 176:2d0c9ad7ef62 321 }
mbed_official 176:2d0c9ad7ef62 322 }
mbed_official 171:3d240fda1f07 323 return event;
mbed_official 80:66393a7b209d 324 }
mbed_official 80:66393a7b209d 325
mbed_official 80:66393a7b209d 326 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 80:66393a7b209d 327 int count = 0;
mbed_official 216:577900467c9e 328
mbed_official 80:66393a7b209d 329 // Read all bytes
mbed_official 80:66393a7b209d 330 for (count = 0; count < length; count++) {
mbed_official 80:66393a7b209d 331 data[count] = i2c_byte_read(obj, 0);
mbed_official 80:66393a7b209d 332 }
mbed_official 216:577900467c9e 333
mbed_official 80:66393a7b209d 334 return count;
mbed_official 80:66393a7b209d 335 }
mbed_official 80:66393a7b209d 336
mbed_official 80:66393a7b209d 337 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 80:66393a7b209d 338 int count = 0;
mbed_official 216:577900467c9e 339
mbed_official 80:66393a7b209d 340 // Write all bytes
mbed_official 80:66393a7b209d 341 for (count = 0; count < length; count++) {
mbed_official 80:66393a7b209d 342 i2c_byte_write(obj, data[count]);
mbed_official 80:66393a7b209d 343 }
mbed_official 216:577900467c9e 344
mbed_official 80:66393a7b209d 345 return count;
mbed_official 80:66393a7b209d 346 }
mbed_official 80:66393a7b209d 347
mbed_official 80:66393a7b209d 348
mbed_official 80:66393a7b209d 349 #endif // DEVICE_I2CSLAVE
mbed_official 80:66393a7b209d 350
mbed_official 80:66393a7b209d 351 #endif // DEVICE_I2C