Janek Mann / mbed-src-openwear

mbed library sources modified for open wear

Dependents:   openwear-lifelogger-example

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F030R8/i2c_api.c@306:1f0269907d8b, 2014-08-29 (annotated)

Committer:
mbed_official
Date:
Fri Aug 29 20:45:07 2014 +0100
Revision:
306:1f0269907d8b
Parent:
247:135e3186a638 
Synchronized with git revision f304c6ba83591678388024d30440e94781fa8d65



Full URL: https://github.com/mbedmicro/mbed/commit/f304c6ba83591678388024d30440e94781fa8d65/



[NUCLEOs] enhance i2c api

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 306:1f0269907d8b 58 int i2c1_inited = 0;
mbed_official 306:1f0269907d8b 59 int i2c2_inited = 0;
mbed_official 306:1f0269907d8b 60
mbed_official 216:577900467c9e 61 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 80:66393a7b209d 62 // Determine the I2C to use
mbed_official 80:66393a7b209d 63 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 80:66393a7b209d 64 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 80:66393a7b209d 65
mbed_official 80:66393a7b209d 66 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 67 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 80:66393a7b209d 68
mbed_official 306:1f0269907d8b 69 // Enable I2C1 clock and pinout if not done
mbed_official 306:1f0269907d8b 70 if ((obj->i2c == I2C_1)&& !i2c1_inited) {
mbed_official 306:1f0269907d8b 71 i2c1_inited = 1;
mbed_official 80:66393a7b209d 72 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 176:2d0c9ad7ef62 73 RCC_I2CCLKConfig(RCC_I2C1CLK_SYSCLK);
mbed_official 306:1f0269907d8b 74 // Configure I2C pins
mbed_official 306:1f0269907d8b 75 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 306:1f0269907d8b 76 pin_mode(scl, OpenDrain);
mbed_official 306:1f0269907d8b 77 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 306:1f0269907d8b 78 pin_mode(sda, OpenDrain);
mbed_official 171:3d240fda1f07 79 }
mbed_official 80:66393a7b209d 80
mbed_official 306:1f0269907d8b 81 // Enable I2C2 clock and pinout if not done
mbed_official 306:1f0269907d8b 82 if ((obj->i2c == I2C_2)&& !i2c2_inited) {
mbed_official 306:1f0269907d8b 83 i2c2_inited = 1;
mbed_official 306:1f0269907d8b 84 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 306:1f0269907d8b 85 // Configure I2C pins
mbed_official 306:1f0269907d8b 86 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 306:1f0269907d8b 87 pin_mode(scl, OpenDrain);
mbed_official 306:1f0269907d8b 88 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 306:1f0269907d8b 89 pin_mode(sda, OpenDrain);
mbed_official 306:1f0269907d8b 90 }
mbed_official 216:577900467c9e 91
mbed_official 80:66393a7b209d 92 // Reset to clear pending flags if any
mbed_official 80:66393a7b209d 93 i2c_reset(obj);
mbed_official 216:577900467c9e 94
mbed_official 80:66393a7b209d 95 // I2C configuration
mbed_official 216:577900467c9e 96 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 80:66393a7b209d 97 }
mbed_official 80:66393a7b209d 98
mbed_official 80:66393a7b209d 99 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 227:7bd0639b8911 100 MBED_ASSERT((hz == 100000) || (hz == 200000) || (hz == 400000) || (hz == 1000000));
mbed_official 80:66393a7b209d 101 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 80:66393a7b209d 102 I2C_InitTypeDef I2C_InitStructure;
mbed_official 166:cb4253f91ada 103 uint32_t tim = 0;
mbed_official 306:1f0269907d8b 104 int timeout;
mbed_official 306:1f0269907d8b 105
mbed_official 306:1f0269907d8b 106 // wait before init
mbed_official 306:1f0269907d8b 107 timeout = LONG_TIMEOUT;
mbed_official 306:1f0269907d8b 108 while((I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 166:cb4253f91ada 109
mbed_official 166:cb4253f91ada 110 // Disable the Fast Mode Plus capability
mbed_official 166:cb4253f91ada 111 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); // Enable SYSCFG clock
mbed_official 166:cb4253f91ada 112 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, DISABLE);
mbed_official 166:cb4253f91ada 113 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, DISABLE);
mbed_official 216:577900467c9e 114
mbed_official 166:cb4253f91ada 115 /*
mbed_official 166:cb4253f91ada 116 Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
mbed_official 166:cb4253f91ada 117 * Standard mode (up to 100 kHz)
mbed_official 166:cb4253f91ada 118 * Fast Mode (up to 400 kHz)
mbed_official 166:cb4253f91ada 119 * Fast Mode Plus (up to 1 MHz)
mbed_official 166:cb4253f91ada 120 Below values obtained with:
mbed_official 176:2d0c9ad7ef62 121 - I2C clock source = 48 MHz (System Clock)
mbed_official 166:cb4253f91ada 122 - Analog filter delay = ON
mbed_official 166:cb4253f91ada 123 - Digital filter coefficient = 0
mbed_official 166:cb4253f91ada 124 - Rise time = 100 ns
mbed_official 166:cb4253f91ada 125 - Fall time = 10ns
mbed_official 166:cb4253f91ada 126 */
mbed_official 80:66393a7b209d 127 switch (hz) {
mbed_official 227:7bd0639b8911 128 case 100000:
mbed_official 227:7bd0639b8911 129 tim = 0x10805E89; // Standard mode
mbed_official 227:7bd0639b8911 130 break;
mbed_official 227:7bd0639b8911 131 case 200000:
mbed_official 227:7bd0639b8911 132 tim = 0x00905E82; // Fast Mode
mbed_official 227:7bd0639b8911 133 break;
mbed_official 227:7bd0639b8911 134 case 400000:
mbed_official 227:7bd0639b8911 135 tim = 0x00901850; // Fast Mode
mbed_official 227:7bd0639b8911 136 break;
mbed_official 227:7bd0639b8911 137 case 1000000:
mbed_official 227:7bd0639b8911 138 tim = 0x00700818; // Fast Mode Plus
mbed_official 227:7bd0639b8911 139 // Enable the Fast Mode Plus capability
mbed_official 227:7bd0639b8911 140 if (obj->i2c == I2C_1) {
mbed_official 227:7bd0639b8911 141 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, ENABLE);
mbed_official 227:7bd0639b8911 142 }
mbed_official 227:7bd0639b8911 143 if (obj->i2c == I2C_2) {
mbed_official 227:7bd0639b8911 144 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, ENABLE);
mbed_official 227:7bd0639b8911 145 }
mbed_official 227:7bd0639b8911 146 break;
mbed_official 227:7bd0639b8911 147 default:
mbed_official 227:7bd0639b8911 148 break;
mbed_official 80:66393a7b209d 149 }
mbed_official 216:577900467c9e 150
mbed_official 80:66393a7b209d 151 // I2C configuration
mbed_official 166:cb4253f91ada 152 I2C_DeInit(i2c);
mbed_official 80:66393a7b209d 153 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 80:66393a7b209d 154 I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
mbed_official 80:66393a7b209d 155 I2C_InitStructure.I2C_DigitalFilter = 0x00;
mbed_official 80:66393a7b209d 156 I2C_InitStructure.I2C_OwnAddress1 = 0x00;
mbed_official 80:66393a7b209d 157 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 80:66393a7b209d 158 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 166:cb4253f91ada 159 I2C_InitStructure.I2C_Timing = tim;
mbed_official 80:66393a7b209d 160 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 216:577900467c9e 161
mbed_official 80:66393a7b209d 162 I2C_Cmd(i2c, ENABLE);
mbed_official 80:66393a7b209d 163 }
mbed_official 80:66393a7b209d 164
mbed_official 80:66393a7b209d 165 inline int i2c_start(i2c_t *obj) {
mbed_official 80:66393a7b209d 166 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 84:f54042cbc282 167 int timeout;
mbed_official 80:66393a7b209d 168
mbed_official 80:66393a7b209d 169 // Test BUSY Flag
mbed_official 84:f54042cbc282 170 timeout = LONG_TIMEOUT;
mbed_official 84:f54042cbc282 171 while (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) != RESET) {
mbed_official 84:f54042cbc282 172 timeout--;
mbed_official 84:f54042cbc282 173 if (timeout == 0) {
mbed_official 84:f54042cbc282 174 return 0;
mbed_official 84:f54042cbc282 175 }
mbed_official 80:66393a7b209d 176 }
mbed_official 80:66393a7b209d 177
mbed_official 80:66393a7b209d 178 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 80:66393a7b209d 179
mbed_official 80:66393a7b209d 180 return 0;
mbed_official 80:66393a7b209d 181 }
mbed_official 80:66393a7b209d 182
mbed_official 80:66393a7b209d 183 inline int i2c_stop(i2c_t *obj) {
mbed_official 80:66393a7b209d 184 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 216:577900467c9e 185
mbed_official 80:66393a7b209d 186 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 216:577900467c9e 187
mbed_official 80:66393a7b209d 188 return 0;
mbed_official 80:66393a7b209d 189 }
mbed_official 80:66393a7b209d 190
mbed_official 80:66393a7b209d 191 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 80:66393a7b209d 192 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 80:66393a7b209d 193 int count;
mbed_official 197:36a724675865 194 int timeout;
mbed_official 80:66393a7b209d 195 int value;
mbed_official 216:577900467c9e 196
mbed_official 80:66393a7b209d 197 // Configure slave address, nbytes, reload, end mode and start or stop generation
mbed_official 197:36a724675865 198 I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Read);
mbed_official 216:577900467c9e 199
mbed_official 80:66393a7b209d 200 // Read all bytes
mbed_official 80:66393a7b209d 201 for (count = 0; count < length; count++) {
mbed_official 80:66393a7b209d 202 value = i2c_byte_read(obj, 0);
mbed_official 80:66393a7b209d 203 data[count] = (char)value;
mbed_official 80:66393a7b209d 204 }
mbed_official 216:577900467c9e 205
mbed_official 197:36a724675865 206 timeout = FLAG_TIMEOUT;
mbed_official 216:577900467c9e 207 while (!I2C_GetFlagStatus(i2c, I2C_FLAG_TC)) {
mbed_official 197:36a724675865 208 timeout--;
mbed_official 247:135e3186a638 209 if (timeout == 0) return -1;
mbed_official 197:36a724675865 210 }
mbed_official 216:577900467c9e 211
mbed_official 216:577900467c9e 212 if (stop) i2c_stop(obj);
mbed_official 197:36a724675865 213
mbed_official 80:66393a7b209d 214 return length;
mbed_official 80:66393a7b209d 215 }
mbed_official 80:66393a7b209d 216
mbed_official 80:66393a7b209d 217 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 80:66393a7b209d 218 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 197:36a724675865 219 int timeout;
mbed_official 80:66393a7b209d 220 int count;
mbed_official 216:577900467c9e 221
mbed_official 197:36a724675865 222 // Configure slave address, nbytes, reload, end mode and start generation
mbed_official 216:577900467c9e 223 I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
mbed_official 216:577900467c9e 224
mbed_official 80:66393a7b209d 225 // Write all bytes
mbed_official 80:66393a7b209d 226 for (count = 0; count < length; count++) {
mbed_official 197:36a724675865 227 i2c_byte_write(obj, data[count]);
mbed_official 216:577900467c9e 228 }
mbed_official 216:577900467c9e 229
mbed_official 197:36a724675865 230 timeout = FLAG_TIMEOUT;
mbed_official 216:577900467c9e 231 while (!I2C_GetFlagStatus(i2c, I2C_FLAG_TC)) {
mbed_official 197:36a724675865 232 timeout--;
mbed_official 247:135e3186a638 233 if (timeout == 0) return -1;
mbed_official 80:66393a7b209d 234 }
mbed_official 80:66393a7b209d 235
mbed_official 216:577900467c9e 236 if (stop) i2c_stop(obj);
mbed_official 216:577900467c9e 237
mbed_official 80:66393a7b209d 238 return count;
mbed_official 80:66393a7b209d 239 }
mbed_official 80:66393a7b209d 240
mbed_official 80:66393a7b209d 241 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 80:66393a7b209d 242 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 80:66393a7b209d 243 uint8_t data;
mbed_official 84:f54042cbc282 244 int timeout;
mbed_official 216:577900467c9e 245
mbed_official 80:66393a7b209d 246 // Wait until the byte is received
mbed_official 216:577900467c9e 247 timeout = FLAG_TIMEOUT;
mbed_official 80:66393a7b209d 248 while (I2C_GetFlagStatus(i2c, I2C_ISR_RXNE) == RESET) {
mbed_official 84:f54042cbc282 249 timeout--;
mbed_official 84:f54042cbc282 250 if (timeout == 0) {
mbed_official 247:135e3186a638 251 return -1;
mbed_official 84:f54042cbc282 252 }
mbed_official 80:66393a7b209d 253 }
mbed_official 80:66393a7b209d 254
mbed_official 80:66393a7b209d 255 data = I2C_ReceiveData(i2c);
mbed_official 216:577900467c9e 256
mbed_official 80:66393a7b209d 257 return (int)data;
mbed_official 80:66393a7b209d 258 }
mbed_official 80:66393a7b209d 259
mbed_official 80:66393a7b209d 260 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 80:66393a7b209d 261 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 84:f54042cbc282 262 int timeout;
mbed_official 80:66393a7b209d 263
mbed_official 84:f54042cbc282 264 // Wait until the previous byte is transmitted
mbed_official 84:f54042cbc282 265 timeout = FLAG_TIMEOUT;
mbed_official 84:f54042cbc282 266 while (I2C_GetFlagStatus(i2c, I2C_ISR_TXIS) == RESET) {
mbed_official 84:f54042cbc282 267 timeout--;
mbed_official 84:f54042cbc282 268 if (timeout == 0) {
mbed_official 84:f54042cbc282 269 return 0;
mbed_official 84:f54042cbc282 270 }
mbed_official 80:66393a7b209d 271 }
mbed_official 216:577900467c9e 272
mbed_official 80:66393a7b209d 273 I2C_SendData(i2c, (uint8_t)data);
mbed_official 216:577900467c9e 274
mbed_official 80:66393a7b209d 275 return 1;
mbed_official 80:66393a7b209d 276 }
mbed_official 80:66393a7b209d 277
mbed_official 80:66393a7b209d 278 void i2c_reset(i2c_t *obj) {
mbed_official 306:1f0269907d8b 279 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 306:1f0269907d8b 280 int timeout;
mbed_official 306:1f0269907d8b 281
mbed_official 306:1f0269907d8b 282 // wait before reset
mbed_official 306:1f0269907d8b 283 timeout = LONG_TIMEOUT;
mbed_official 306:1f0269907d8b 284 while((I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 306:1f0269907d8b 285
mbed_official 216:577900467c9e 286 if (obj->i2c == I2C_1) {
mbed_official 80:66393a7b209d 287 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 80:66393a7b209d 288 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 80:66393a7b209d 289 }
mbed_official 171:3d240fda1f07 290 if (obj->i2c == I2C_2) {
mbed_official 171:3d240fda1f07 291 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 216:577900467c9e 292 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 171:3d240fda1f07 293 }
mbed_official 80:66393a7b209d 294 }
mbed_official 80:66393a7b209d 295
mbed_official 80:66393a7b209d 296 #if DEVICE_I2CSLAVE
mbed_official 80:66393a7b209d 297
mbed_official 80:66393a7b209d 298 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 80:66393a7b209d 299 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 80:66393a7b209d 300 uint16_t tmpreg;
mbed_official 216:577900467c9e 301
mbed_official 171:3d240fda1f07 302 // reset own address enable
mbed_official 216:577900467c9e 303 i2c->OAR1 &= ~ I2C_OAR1_OA1EN;
mbed_official 216:577900467c9e 304
mbed_official 80:66393a7b209d 305 // Get the old register value
mbed_official 80:66393a7b209d 306 tmpreg = i2c->OAR1;
mbed_official 80:66393a7b209d 307 // Reset address bits
mbed_official 80:66393a7b209d 308 tmpreg &= 0xFC00;
mbed_official 80:66393a7b209d 309 // Set new address
mbed_official 80:66393a7b209d 310 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 80:66393a7b209d 311 // Store the new register value
mbed_official 171:3d240fda1f07 312 i2c->OAR1 = tmpreg | I2C_OAR1_OA1EN;
mbed_official 80:66393a7b209d 313 }
mbed_official 80:66393a7b209d 314
mbed_official 80:66393a7b209d 315 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 80:66393a7b209d 316 // Nothing to do
mbed_official 80:66393a7b209d 317 }
mbed_official 80:66393a7b209d 318
mbed_official 80:66393a7b209d 319 // See I2CSlave.h
mbed_official 80:66393a7b209d 320 #define NoData 0 // the slave has not been addressed
mbed_official 80:66393a7b209d 321 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 80:66393a7b209d 322 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 80:66393a7b209d 323 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 80:66393a7b209d 324
mbed_official 80:66393a7b209d 325 int i2c_slave_receive(i2c_t *obj) {
mbed_official 171:3d240fda1f07 326 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 176:2d0c9ad7ef62 327 int event = NoData;
mbed_official 216:577900467c9e 328
mbed_official 216:577900467c9e 329 if (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) == SET) {
mbed_official 216:577900467c9e 330 if (I2C_GetFlagStatus(i2c, I2C_ISR_ADDR) == SET) {
mbed_official 216:577900467c9e 331 // Check direction
mbed_official 176:2d0c9ad7ef62 332 if (I2C_GetFlagStatus(i2c, I2C_ISR_DIR) == SET) {
mbed_official 216:577900467c9e 333 event = ReadAddressed;
mbed_official 216:577900467c9e 334 } else event = WriteAddressed;
mbed_official 216:577900467c9e 335 // Clear adress match flag to generate an acknowledge
mbed_official 216:577900467c9e 336 i2c->ICR |= I2C_ICR_ADDRCF;
mbed_official 176:2d0c9ad7ef62 337 }
mbed_official 176:2d0c9ad7ef62 338 }
mbed_official 171:3d240fda1f07 339 return event;
mbed_official 80:66393a7b209d 340 }
mbed_official 80:66393a7b209d 341
mbed_official 80:66393a7b209d 342 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 80:66393a7b209d 343 int count = 0;
mbed_official 216:577900467c9e 344
mbed_official 80:66393a7b209d 345 // Read all bytes
mbed_official 80:66393a7b209d 346 for (count = 0; count < length; count++) {
mbed_official 80:66393a7b209d 347 data[count] = i2c_byte_read(obj, 0);
mbed_official 80:66393a7b209d 348 }
mbed_official 216:577900467c9e 349
mbed_official 80:66393a7b209d 350 return count;
mbed_official 80:66393a7b209d 351 }
mbed_official 80:66393a7b209d 352
mbed_official 80:66393a7b209d 353 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 80:66393a7b209d 354 int count = 0;
mbed_official 216:577900467c9e 355
mbed_official 80:66393a7b209d 356 // Write all bytes
mbed_official 80:66393a7b209d 357 for (count = 0; count < length; count++) {
mbed_official 80:66393a7b209d 358 i2c_byte_write(obj, data[count]);
mbed_official 80:66393a7b209d 359 }
mbed_official 216:577900467c9e 360
mbed_official 80:66393a7b209d 361 return count;
mbed_official 80:66393a7b209d 362 }
mbed_official 80:66393a7b209d 363
mbed_official 80:66393a7b209d 364
mbed_official 80:66393a7b209d 365 #endif // DEVICE_I2CSLAVE
mbed_official 80:66393a7b209d 366
mbed_official 80:66393a7b209d 367 #endif // DEVICE_I2C