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_F302R8/i2c_api.c@227:7bd0639b8911, 2014-06-11 (annotated)

Committer:
mbed_official
Date:
Wed Jun 11 16:00:09 2014 +0100
Revision:
227:7bd0639b8911
Parent:
216:577900467c9e
Child:
247:135e3186a638
Synchronized with git revision d58d532ebc0e0a96f4fffb8edefc082b71b964af



Full URL: https://github.com/mbedmicro/mbed/commit/d58d532ebc0e0a96f4fffb8edefc082b71b964af/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 125:23cc3068a9e4 1 /* mbed Microcontroller Library
mbed_official 125:23cc3068a9e4 2 *******************************************************************************
mbed_official 125:23cc3068a9e4 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 125:23cc3068a9e4 4 * All rights reserved.
mbed_official 125:23cc3068a9e4 5 *
mbed_official 125:23cc3068a9e4 6 * Redistribution and use in source and binary forms, with or without
mbed_official 125:23cc3068a9e4 7 * modification, are permitted provided that the following conditions are met:
mbed_official 125:23cc3068a9e4 8 *
mbed_official 125:23cc3068a9e4 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 125:23cc3068a9e4 10 * this list of conditions and the following disclaimer.
mbed_official 125:23cc3068a9e4 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 125:23cc3068a9e4 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 125:23cc3068a9e4 13 * and/or other materials provided with the distribution.
mbed_official 125:23cc3068a9e4 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 125:23cc3068a9e4 15 * may be used to endorse or promote products derived from this software
mbed_official 125:23cc3068a9e4 16 * without specific prior written permission.
mbed_official 125:23cc3068a9e4 17 *
mbed_official 125:23cc3068a9e4 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 125:23cc3068a9e4 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 125:23cc3068a9e4 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 125:23cc3068a9e4 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 125:23cc3068a9e4 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 125:23cc3068a9e4 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 125:23cc3068a9e4 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 125:23cc3068a9e4 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 125:23cc3068a9e4 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 125:23cc3068a9e4 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 125:23cc3068a9e4 28 *******************************************************************************
mbed_official 125:23cc3068a9e4 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 125:23cc3068a9e4 31 #include "i2c_api.h"
mbed_official 125:23cc3068a9e4 32
mbed_official 125:23cc3068a9e4 33 #if DEVICE_I2C
mbed_official 125:23cc3068a9e4 34
mbed_official 125:23cc3068a9e4 35 #include "cmsis.h"
mbed_official 125:23cc3068a9e4 36 #include "pinmap.h"
mbed_official 125:23cc3068a9e4 37 #include "error.h"
mbed_official 125:23cc3068a9e4 38
mbed_official 125:23cc3068a9e4 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 135:067cc8ba23da 40 not based on accurate values, they just guarantee that the application will
mbed_official 135:067cc8ba23da 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 125:23cc3068a9e4 42 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 125:23cc3068a9e4 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 125:23cc3068a9e4 44
mbed_official 125:23cc3068a9e4 45 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 125:23cc3068a9e4 46 {PA_10, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 125:23cc3068a9e4 47 {PA_14, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 125:23cc3068a9e4 48 {PB_5, I2C_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_8)},
mbed_official 125:23cc3068a9e4 49 {PB_7, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 125:23cc3068a9e4 50 {PB_9, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 125:23cc3068a9e4 51 {PC_9, I2C_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_3)},
mbed_official 125:23cc3068a9e4 52 {PF_0, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 125:23cc3068a9e4 53 {NC, NC, 0}
mbed_official 125:23cc3068a9e4 54 };
mbed_official 125:23cc3068a9e4 55
mbed_official 125:23cc3068a9e4 56 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 125:23cc3068a9e4 57 {PA_8, I2C_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_3)},
mbed_official 125:23cc3068a9e4 58 {PA_9, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 125:23cc3068a9e4 59 {PA_15, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 125:23cc3068a9e4 60 {PB_6, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 125:23cc3068a9e4 61 {PB_8, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 125:23cc3068a9e4 62 {PF_1, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 125:23cc3068a9e4 63 {NC, NC, 0}
mbed_official 125:23cc3068a9e4 64 };
mbed_official 125:23cc3068a9e4 65
mbed_official 135:067cc8ba23da 66 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 125:23cc3068a9e4 67 // Determine the I2C to use
mbed_official 125:23cc3068a9e4 68 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 125:23cc3068a9e4 69 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 125:23cc3068a9e4 70
mbed_official 125:23cc3068a9e4 71 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 72 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 125:23cc3068a9e4 73
mbed_official 125:23cc3068a9e4 74 // Enable I2C clock
mbed_official 135:067cc8ba23da 75 if (obj->i2c == I2C_1) {
mbed_official 125:23cc3068a9e4 76 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 197:36a724675865 77 RCC_I2CCLKConfig(RCC_I2C1CLK_SYSCLK);
mbed_official 125:23cc3068a9e4 78 }
mbed_official 125:23cc3068a9e4 79 if (obj->i2c == I2C_2) {
mbed_official 125:23cc3068a9e4 80 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 125:23cc3068a9e4 81 }
mbed_official 125:23cc3068a9e4 82 if (obj->i2c == I2C_3) {
mbed_official 125:23cc3068a9e4 83 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C3, ENABLE);
mbed_official 125:23cc3068a9e4 84 }
mbed_official 135:067cc8ba23da 85
mbed_official 125:23cc3068a9e4 86 // Configure I2C pins
mbed_official 125:23cc3068a9e4 87 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 125:23cc3068a9e4 88 pin_mode(scl, OpenDrain);
mbed_official 125:23cc3068a9e4 89 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 125:23cc3068a9e4 90 pin_mode(sda, OpenDrain);
mbed_official 135:067cc8ba23da 91
mbed_official 125:23cc3068a9e4 92 // Reset to clear pending flags if any
mbed_official 125:23cc3068a9e4 93 i2c_reset(obj);
mbed_official 135:067cc8ba23da 94
mbed_official 125:23cc3068a9e4 95 // I2C configuration
mbed_official 135:067cc8ba23da 96 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 125:23cc3068a9e4 97 }
mbed_official 125:23cc3068a9e4 98
mbed_official 125:23cc3068a9e4 99 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 125:23cc3068a9e4 100 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 125:23cc3068a9e4 101 I2C_InitTypeDef I2C_InitStructure;
mbed_official 162:937d965048d3 102 uint32_t tim = 0;
mbed_official 125:23cc3068a9e4 103
mbed_official 125:23cc3068a9e4 104 // Disable the Fast Mode Plus capability
mbed_official 125:23cc3068a9e4 105 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); // Enable SYSCFG clock
mbed_official 125:23cc3068a9e4 106 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, DISABLE);
mbed_official 125:23cc3068a9e4 107 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, DISABLE);
mbed_official 135:067cc8ba23da 108
mbed_official 125:23cc3068a9e4 109 /*
mbed_official 125:23cc3068a9e4 110 Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
mbed_official 125:23cc3068a9e4 111 * Standard mode (up to 100 kHz)
mbed_official 125:23cc3068a9e4 112 * Fast Mode (up to 400 kHz)
mbed_official 125:23cc3068a9e4 113 * Fast Mode Plus (up to 1 MHz)
mbed_official 125:23cc3068a9e4 114 Below values obtained with:
mbed_official 197:36a724675865 115 - I2C clock source = 64 MHz (System Clock w/ HSI) or 72 (System Clock w/ HSE)
mbed_official 125:23cc3068a9e4 116 - Analog filter delay = ON
mbed_official 125:23cc3068a9e4 117 - Digital filter coefficient = 0
mbed_official 125:23cc3068a9e4 118 - Rise time = 100 ns
mbed_official 125:23cc3068a9e4 119 - Fall time = 10ns
mbed_official 125:23cc3068a9e4 120 */
mbed_official 197:36a724675865 121 if (SystemCoreClock == 64000000) {
mbed_official 197:36a724675865 122 switch (hz) {
mbed_official 197:36a724675865 123 case 100000:
mbed_official 197:36a724675865 124 tim = 0x60302730; // Standard mode
mbed_official 216:577900467c9e 125 break;
mbed_official 197:36a724675865 126 case 200000:
mbed_official 197:36a724675865 127 tim = 0x00C07AB3; // Fast Mode
mbed_official 216:577900467c9e 128 break;
mbed_official 197:36a724675865 129 case 400000:
mbed_official 197:36a724675865 130 tim = 0x00C0216C; // Fast Mode
mbed_official 216:577900467c9e 131 break;
mbed_official 197:36a724675865 132 case 1000000:
mbed_official 197:36a724675865 133 tim = 0x00900B22; // Fast Mode Plus
mbed_official 197:36a724675865 134 // Enable the Fast Mode Plus capability
mbed_official 197:36a724675865 135 if (obj->i2c == I2C_1) {
mbed_official 197:36a724675865 136 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, ENABLE);
mbed_official 197:36a724675865 137 }
mbed_official 197:36a724675865 138 if (obj->i2c == I2C_2) {
mbed_official 197:36a724675865 139 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, ENABLE);
mbed_official 197:36a724675865 140 }
mbed_official 216:577900467c9e 141 break;
mbed_official 197:36a724675865 142 default:
mbed_official 197:36a724675865 143 error("Only 100kHz, 200kHz, 400kHz and 1MHz I2C frequencies are supported.");
mbed_official 216:577900467c9e 144 break;
mbed_official 197:36a724675865 145 }
mbed_official 216:577900467c9e 146 } else if (SystemCoreClock == 72000000) {
mbed_official 197:36a724675865 147 switch (hz) {
mbed_official 197:36a724675865 148 case 100000:
mbed_official 197:36a724675865 149 tim = 0x10C08DCF; // Standard mode
mbed_official 197:36a724675865 150 break;
mbed_official 197:36a724675865 151 case 200000:
mbed_official 197:36a724675865 152 tim = 0xA010031A; // Fast Mode
mbed_official 197:36a724675865 153 break;
mbed_official 197:36a724675865 154 case 400000:
mbed_official 197:36a724675865 155 tim = 0x00E0257A; // Fast Mode
mbed_official 197:36a724675865 156 break;
mbed_official 197:36a724675865 157 case 1000000:
mbed_official 197:36a724675865 158 tim = 0x00A00D26; // Fast Mode Plus
mbed_official 197:36a724675865 159 // Enable the Fast Mode Plus capability
mbed_official 197:36a724675865 160 if (obj->i2c == I2C_1) {
mbed_official 197:36a724675865 161 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, ENABLE);
mbed_official 197:36a724675865 162 }
mbed_official 197:36a724675865 163 if (obj->i2c == I2C_2) {
mbed_official 197:36a724675865 164 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, ENABLE);
mbed_official 197:36a724675865 165 }
mbed_official 197:36a724675865 166 break;
mbed_official 197:36a724675865 167 default:
mbed_official 197:36a724675865 168 error("Only 100kHz, 200kHz, 400kHz and 1MHz I2C frequencies are supported.");
mbed_official 197:36a724675865 169 break;
mbed_official 197:36a724675865 170 }
mbed_official 216:577900467c9e 171 } else {
mbed_official 197:36a724675865 172 error("System clock setting is not supported.");
mbed_official 125:23cc3068a9e4 173 }
mbed_official 135:067cc8ba23da 174
mbed_official 125:23cc3068a9e4 175 // I2C configuration
mbed_official 125:23cc3068a9e4 176 I2C_DeInit(i2c);
mbed_official 125:23cc3068a9e4 177 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 125:23cc3068a9e4 178 I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
mbed_official 125:23cc3068a9e4 179 I2C_InitStructure.I2C_DigitalFilter = 0x00;
mbed_official 125:23cc3068a9e4 180 I2C_InitStructure.I2C_OwnAddress1 = 0x00;
mbed_official 125:23cc3068a9e4 181 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 125:23cc3068a9e4 182 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 125:23cc3068a9e4 183 I2C_InitStructure.I2C_Timing = tim;
mbed_official 125:23cc3068a9e4 184 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 135:067cc8ba23da 185
mbed_official 125:23cc3068a9e4 186 I2C_Cmd(i2c, ENABLE);
mbed_official 125:23cc3068a9e4 187 }
mbed_official 125:23cc3068a9e4 188
mbed_official 125:23cc3068a9e4 189 inline int i2c_start(i2c_t *obj) {
mbed_official 125:23cc3068a9e4 190 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 125:23cc3068a9e4 191 int timeout;
mbed_official 125:23cc3068a9e4 192
mbed_official 125:23cc3068a9e4 193 // Test BUSY Flag
mbed_official 125:23cc3068a9e4 194 timeout = LONG_TIMEOUT;
mbed_official 125:23cc3068a9e4 195 while (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) != RESET) {
mbed_official 125:23cc3068a9e4 196 timeout--;
mbed_official 125:23cc3068a9e4 197 if (timeout == 0) {
mbed_official 125:23cc3068a9e4 198 return 0;
mbed_official 125:23cc3068a9e4 199 }
mbed_official 125:23cc3068a9e4 200 }
mbed_official 125:23cc3068a9e4 201
mbed_official 125:23cc3068a9e4 202 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 125:23cc3068a9e4 203
mbed_official 125:23cc3068a9e4 204 return 0;
mbed_official 125:23cc3068a9e4 205 }
mbed_official 125:23cc3068a9e4 206
mbed_official 125:23cc3068a9e4 207 inline int i2c_stop(i2c_t *obj) {
mbed_official 125:23cc3068a9e4 208 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 135:067cc8ba23da 209
mbed_official 125:23cc3068a9e4 210 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 135:067cc8ba23da 211
mbed_official 125:23cc3068a9e4 212 return 0;
mbed_official 125:23cc3068a9e4 213 }
mbed_official 125:23cc3068a9e4 214
mbed_official 197:36a724675865 215
mbed_official 125:23cc3068a9e4 216 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 125:23cc3068a9e4 217 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 125:23cc3068a9e4 218 int count;
mbed_official 197:36a724675865 219 int timeout;
mbed_official 125:23cc3068a9e4 220 int value;
mbed_official 135:067cc8ba23da 221
mbed_official 125:23cc3068a9e4 222 if (length == 0) return 0;
mbed_official 125:23cc3068a9e4 223
mbed_official 125:23cc3068a9e4 224 // Configure slave address, nbytes, reload, end mode and start or stop generation
mbed_official 197:36a724675865 225 I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Read);
mbed_official 135:067cc8ba23da 226
mbed_official 125:23cc3068a9e4 227 // Read all bytes
mbed_official 125:23cc3068a9e4 228 for (count = 0; count < length; count++) {
mbed_official 125:23cc3068a9e4 229 value = i2c_byte_read(obj, 0);
mbed_official 125:23cc3068a9e4 230 data[count] = (char)value;
mbed_official 125:23cc3068a9e4 231 }
mbed_official 135:067cc8ba23da 232
mbed_official 197:36a724675865 233 timeout = FLAG_TIMEOUT;
mbed_official 216:577900467c9e 234 while (!I2C_GetFlagStatus(i2c, I2C_FLAG_TC)) {
mbed_official 197:36a724675865 235 timeout--;
mbed_official 197:36a724675865 236 if (timeout == 0) return 0;
mbed_official 197:36a724675865 237 }
mbed_official 216:577900467c9e 238
mbed_official 216:577900467c9e 239 if (stop) i2c_stop(obj);
mbed_official 197:36a724675865 240
mbed_official 125:23cc3068a9e4 241 return length;
mbed_official 125:23cc3068a9e4 242 }
mbed_official 125:23cc3068a9e4 243
mbed_official 197:36a724675865 244
mbed_official 125:23cc3068a9e4 245 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 125:23cc3068a9e4 246 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 197:36a724675865 247 int timeout;
mbed_official 125:23cc3068a9e4 248 int count;
mbed_official 135:067cc8ba23da 249
mbed_official 125:23cc3068a9e4 250 if (length == 0) return 0;
mbed_official 125:23cc3068a9e4 251
mbed_official 197:36a724675865 252 // Configure slave address, nbytes, reload, end mode and start generation
mbed_official 197:36a724675865 253 I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
mbed_official 135:067cc8ba23da 254
mbed_official 125:23cc3068a9e4 255 // Write all bytes
mbed_official 125:23cc3068a9e4 256 for (count = 0; count < length; count++) {
mbed_official 197:36a724675865 257 i2c_byte_write(obj, data[count]);
mbed_official 125:23cc3068a9e4 258 }
mbed_official 125:23cc3068a9e4 259
mbed_official 197:36a724675865 260 timeout = FLAG_TIMEOUT;
mbed_official 216:577900467c9e 261 while (!I2C_GetFlagStatus(i2c, I2C_FLAG_TC)) {
mbed_official 197:36a724675865 262 timeout--;
mbed_official 197:36a724675865 263 if (timeout == 0) return 0;
mbed_official 125:23cc3068a9e4 264 }
mbed_official 216:577900467c9e 265
mbed_official 216:577900467c9e 266 if (stop) i2c_stop(obj);
mbed_official 135:067cc8ba23da 267
mbed_official 125:23cc3068a9e4 268 return count;
mbed_official 125:23cc3068a9e4 269 }
mbed_official 125:23cc3068a9e4 270
mbed_official 125:23cc3068a9e4 271 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 125:23cc3068a9e4 272 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 125:23cc3068a9e4 273 uint8_t data;
mbed_official 125:23cc3068a9e4 274 int timeout;
mbed_official 135:067cc8ba23da 275
mbed_official 125:23cc3068a9e4 276 // Wait until the byte is received
mbed_official 135:067cc8ba23da 277 timeout = FLAG_TIMEOUT;
mbed_official 125:23cc3068a9e4 278 while (I2C_GetFlagStatus(i2c, I2C_ISR_RXNE) == RESET) {
mbed_official 125:23cc3068a9e4 279 timeout--;
mbed_official 125:23cc3068a9e4 280 if (timeout == 0) {
mbed_official 125:23cc3068a9e4 281 return 0;
mbed_official 125:23cc3068a9e4 282 }
mbed_official 125:23cc3068a9e4 283 }
mbed_official 125:23cc3068a9e4 284
mbed_official 125:23cc3068a9e4 285 data = I2C_ReceiveData(i2c);
mbed_official 135:067cc8ba23da 286
mbed_official 125:23cc3068a9e4 287 return (int)data;
mbed_official 125:23cc3068a9e4 288 }
mbed_official 125:23cc3068a9e4 289
mbed_official 125:23cc3068a9e4 290 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 125:23cc3068a9e4 291 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 125:23cc3068a9e4 292 int timeout;
mbed_official 125:23cc3068a9e4 293
mbed_official 125:23cc3068a9e4 294 // Wait until the previous byte is transmitted
mbed_official 125:23cc3068a9e4 295 timeout = FLAG_TIMEOUT;
mbed_official 125:23cc3068a9e4 296 while (I2C_GetFlagStatus(i2c, I2C_ISR_TXIS) == RESET) {
mbed_official 125:23cc3068a9e4 297 timeout--;
mbed_official 125:23cc3068a9e4 298 if (timeout == 0) {
mbed_official 125:23cc3068a9e4 299 return 0;
mbed_official 125:23cc3068a9e4 300 }
mbed_official 125:23cc3068a9e4 301 }
mbed_official 135:067cc8ba23da 302
mbed_official 125:23cc3068a9e4 303 I2C_SendData(i2c, (uint8_t)data);
mbed_official 135:067cc8ba23da 304
mbed_official 125:23cc3068a9e4 305 return 1;
mbed_official 125:23cc3068a9e4 306 }
mbed_official 125:23cc3068a9e4 307
mbed_official 125:23cc3068a9e4 308 void i2c_reset(i2c_t *obj) {
mbed_official 135:067cc8ba23da 309 if (obj->i2c == I2C_1) {
mbed_official 125:23cc3068a9e4 310 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 125:23cc3068a9e4 311 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 125:23cc3068a9e4 312 }
mbed_official 125:23cc3068a9e4 313 if (obj->i2c == I2C_2) {
mbed_official 125:23cc3068a9e4 314 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 125:23cc3068a9e4 315 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 125:23cc3068a9e4 316 }
mbed_official 125:23cc3068a9e4 317 if (obj->i2c == I2C_3) {
mbed_official 125:23cc3068a9e4 318 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C3, ENABLE);
mbed_official 135:067cc8ba23da 319 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C3, DISABLE);
mbed_official 125:23cc3068a9e4 320 }
mbed_official 125:23cc3068a9e4 321 }
mbed_official 125:23cc3068a9e4 322
mbed_official 125:23cc3068a9e4 323 #if DEVICE_I2CSLAVE
mbed_official 125:23cc3068a9e4 324
mbed_official 125:23cc3068a9e4 325 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 125:23cc3068a9e4 326 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 125:23cc3068a9e4 327 uint16_t tmpreg;
mbed_official 135:067cc8ba23da 328
mbed_official 197:36a724675865 329 // reset own address enable
mbed_official 216:577900467c9e 330 i2c->OAR1 &= ~ I2C_OAR1_OA1EN;
mbed_official 216:577900467c9e 331
mbed_official 125:23cc3068a9e4 332 // Get the old register value
mbed_official 125:23cc3068a9e4 333 tmpreg = i2c->OAR1;
mbed_official 125:23cc3068a9e4 334 // Reset address bits
mbed_official 125:23cc3068a9e4 335 tmpreg &= 0xFC00;
mbed_official 125:23cc3068a9e4 336 // Set new address
mbed_official 125:23cc3068a9e4 337 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 125:23cc3068a9e4 338 // Store the new register value
mbed_official 197:36a724675865 339 i2c->OAR1 = tmpreg | I2C_OAR1_OA1EN;
mbed_official 125:23cc3068a9e4 340 }
mbed_official 125:23cc3068a9e4 341
mbed_official 125:23cc3068a9e4 342 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 125:23cc3068a9e4 343 // Nothing to do
mbed_official 125:23cc3068a9e4 344 }
mbed_official 125:23cc3068a9e4 345
mbed_official 125:23cc3068a9e4 346 // See I2CSlave.h
mbed_official 125:23cc3068a9e4 347 #define NoData 0 // the slave has not been addressed
mbed_official 125:23cc3068a9e4 348 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 125:23cc3068a9e4 349 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 125:23cc3068a9e4 350 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 125:23cc3068a9e4 351
mbed_official 125:23cc3068a9e4 352 int i2c_slave_receive(i2c_t *obj) {
mbed_official 197:36a724675865 353 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 197:36a724675865 354 int event = NoData;
mbed_official 216:577900467c9e 355
mbed_official 216:577900467c9e 356 if (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) == SET) {
mbed_official 216:577900467c9e 357 if (I2C_GetFlagStatus(i2c, I2C_ISR_ADDR) == SET) {
mbed_official 216:577900467c9e 358 // Check direction
mbed_official 197:36a724675865 359 if (I2C_GetFlagStatus(i2c, I2C_ISR_DIR) == SET) {
mbed_official 197:36a724675865 360 event = ReadAddressed;
mbed_official 216:577900467c9e 361 } else event = WriteAddressed;
mbed_official 216:577900467c9e 362 // Clear adress match flag to generate an acknowledge
mbed_official 216:577900467c9e 363 i2c->ICR |= I2C_ICR_ADDRCF;
mbed_official 197:36a724675865 364 }
mbed_official 197:36a724675865 365 }
mbed_official 197:36a724675865 366 return event;
mbed_official 125:23cc3068a9e4 367 }
mbed_official 125:23cc3068a9e4 368
mbed_official 125:23cc3068a9e4 369 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 125:23cc3068a9e4 370 int count = 0;
mbed_official 135:067cc8ba23da 371
mbed_official 125:23cc3068a9e4 372 // Read all bytes
mbed_official 125:23cc3068a9e4 373 for (count = 0; count < length; count++) {
mbed_official 125:23cc3068a9e4 374 data[count] = i2c_byte_read(obj, 0);
mbed_official 125:23cc3068a9e4 375 }
mbed_official 135:067cc8ba23da 376
mbed_official 125:23cc3068a9e4 377 return count;
mbed_official 125:23cc3068a9e4 378 }
mbed_official 125:23cc3068a9e4 379
mbed_official 125:23cc3068a9e4 380 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 125:23cc3068a9e4 381 int count = 0;
mbed_official 135:067cc8ba23da 382
mbed_official 125:23cc3068a9e4 383 // Write all bytes
mbed_official 125:23cc3068a9e4 384 for (count = 0; count < length; count++) {
mbed_official 125:23cc3068a9e4 385 i2c_byte_write(obj, data[count]);
mbed_official 125:23cc3068a9e4 386 }
mbed_official 135:067cc8ba23da 387
mbed_official 125:23cc3068a9e4 388 return count;
mbed_official 125:23cc3068a9e4 389 }
mbed_official 125:23cc3068a9e4 390
mbed_official 125:23cc3068a9e4 391
mbed_official 125:23cc3068a9e4 392 #endif // DEVICE_I2CSLAVE
mbed_official 125:23cc3068a9e4 393
mbed_official 125:23cc3068a9e4 394 #endif // DEVICE_I2C