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@305:1f0269907d8b, 2014-08-29 (annotated)

Committer:
mbed_official
Date:
Fri Aug 29 20:45:07 2014 +0100
Revision:
305:1f0269907d8b
Parent:
285:31249416b6f9 
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 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 285:31249416b6f9 37 #include "mbed_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 305:1f0269907d8b 66 int i2c1_inited = 0;
mbed_official 305:1f0269907d8b 67 int i2c2_inited = 0;
mbed_official 305:1f0269907d8b 68 int i2c3_inited = 0;
mbed_official 305:1f0269907d8b 69
mbed_official 135:067cc8ba23da 70 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 125:23cc3068a9e4 71 // Determine the I2C to use
mbed_official 125:23cc3068a9e4 72 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 125:23cc3068a9e4 73 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 125:23cc3068a9e4 74
mbed_official 125:23cc3068a9e4 75 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 76 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 125:23cc3068a9e4 77
mbed_official 305:1f0269907d8b 78 // Enable I2C1 clock and pinout if not done
mbed_official 305:1f0269907d8b 79 if ((obj->i2c == I2C_1)&& !i2c1_inited) {
mbed_official 305:1f0269907d8b 80 i2c1_inited = 1;
mbed_official 125:23cc3068a9e4 81 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 197:36a724675865 82 RCC_I2CCLKConfig(RCC_I2C1CLK_SYSCLK);
mbed_official 305:1f0269907d8b 83 // Configure I2C pins
mbed_official 305:1f0269907d8b 84 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 85 pin_mode(scl, OpenDrain);
mbed_official 305:1f0269907d8b 86 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 87 pin_mode(sda, OpenDrain);
mbed_official 125:23cc3068a9e4 88 }
mbed_official 135:067cc8ba23da 89
mbed_official 305:1f0269907d8b 90 // Enable I2C2 clock and pinout if not done
mbed_official 305:1f0269907d8b 91 if ((obj->i2c == I2C_2)&& !i2c2_inited) {
mbed_official 305:1f0269907d8b 92 i2c2_inited = 1;
mbed_official 305:1f0269907d8b 93 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 305:1f0269907d8b 94 // Configure I2C pins
mbed_official 305:1f0269907d8b 95 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 96 pin_mode(scl, OpenDrain);
mbed_official 305:1f0269907d8b 97 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 98 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 99 }
mbed_official 305:1f0269907d8b 100
mbed_official 305:1f0269907d8b 101 // Enable I2C3 clock and pinout if not done
mbed_official 305:1f0269907d8b 102 if ((obj->i2c == I2C_3)&& !i2c3_inited) {
mbed_official 305:1f0269907d8b 103 i2c3_inited = 1;
mbed_official 305:1f0269907d8b 104 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C3, ENABLE);
mbed_official 305:1f0269907d8b 105 // Configure I2C pins
mbed_official 305:1f0269907d8b 106 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 305:1f0269907d8b 107 pin_mode(scl, OpenDrain);
mbed_official 305:1f0269907d8b 108 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 305:1f0269907d8b 109 pin_mode(sda, OpenDrain);
mbed_official 305:1f0269907d8b 110 }
mbed_official 135:067cc8ba23da 111
mbed_official 125:23cc3068a9e4 112 // Reset to clear pending flags if any
mbed_official 125:23cc3068a9e4 113 i2c_reset(obj);
mbed_official 135:067cc8ba23da 114
mbed_official 125:23cc3068a9e4 115 // I2C configuration
mbed_official 135:067cc8ba23da 116 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 125:23cc3068a9e4 117 }
mbed_official 125:23cc3068a9e4 118
mbed_official 125:23cc3068a9e4 119 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 125:23cc3068a9e4 120 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 125:23cc3068a9e4 121 I2C_InitTypeDef I2C_InitStructure;
mbed_official 162:937d965048d3 122 uint32_t tim = 0;
mbed_official 305:1f0269907d8b 123 int timeout;
mbed_official 305:1f0269907d8b 124
mbed_official 305:1f0269907d8b 125 // wait before init
mbed_official 305:1f0269907d8b 126 timeout = LONG_TIMEOUT;
mbed_official 305:1f0269907d8b 127 while((I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 125:23cc3068a9e4 128
mbed_official 125:23cc3068a9e4 129 // Disable the Fast Mode Plus capability
mbed_official 125:23cc3068a9e4 130 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); // Enable SYSCFG clock
mbed_official 125:23cc3068a9e4 131 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, DISABLE);
mbed_official 125:23cc3068a9e4 132 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, DISABLE);
mbed_official 135:067cc8ba23da 133
mbed_official 125:23cc3068a9e4 134 /*
mbed_official 125:23cc3068a9e4 135 Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
mbed_official 125:23cc3068a9e4 136 * Standard mode (up to 100 kHz)
mbed_official 125:23cc3068a9e4 137 * Fast Mode (up to 400 kHz)
mbed_official 125:23cc3068a9e4 138 * Fast Mode Plus (up to 1 MHz)
mbed_official 125:23cc3068a9e4 139 Below values obtained with:
mbed_official 197:36a724675865 140 - I2C clock source = 64 MHz (System Clock w/ HSI) or 72 (System Clock w/ HSE)
mbed_official 125:23cc3068a9e4 141 - Analog filter delay = ON
mbed_official 125:23cc3068a9e4 142 - Digital filter coefficient = 0
mbed_official 125:23cc3068a9e4 143 - Rise time = 100 ns
mbed_official 125:23cc3068a9e4 144 - Fall time = 10ns
mbed_official 125:23cc3068a9e4 145 */
mbed_official 197:36a724675865 146 if (SystemCoreClock == 64000000) {
mbed_official 197:36a724675865 147 switch (hz) {
mbed_official 197:36a724675865 148 case 100000:
mbed_official 197:36a724675865 149 tim = 0x60302730; // Standard mode
mbed_official 216:577900467c9e 150 break;
mbed_official 197:36a724675865 151 case 200000:
mbed_official 197:36a724675865 152 tim = 0x00C07AB3; // Fast Mode
mbed_official 216:577900467c9e 153 break;
mbed_official 197:36a724675865 154 case 400000:
mbed_official 197:36a724675865 155 tim = 0x00C0216C; // Fast Mode
mbed_official 216:577900467c9e 156 break;
mbed_official 197:36a724675865 157 case 1000000:
mbed_official 197:36a724675865 158 tim = 0x00900B22; // 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 216:577900467c9e 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 216:577900467c9e 169 break;
mbed_official 197:36a724675865 170 }
mbed_official 216:577900467c9e 171 } else if (SystemCoreClock == 72000000) {
mbed_official 197:36a724675865 172 switch (hz) {
mbed_official 197:36a724675865 173 case 100000:
mbed_official 197:36a724675865 174 tim = 0x10C08DCF; // Standard mode
mbed_official 197:36a724675865 175 break;
mbed_official 197:36a724675865 176 case 200000:
mbed_official 197:36a724675865 177 tim = 0xA010031A; // Fast Mode
mbed_official 197:36a724675865 178 break;
mbed_official 197:36a724675865 179 case 400000:
mbed_official 197:36a724675865 180 tim = 0x00E0257A; // Fast Mode
mbed_official 197:36a724675865 181 break;
mbed_official 197:36a724675865 182 case 1000000:
mbed_official 197:36a724675865 183 tim = 0x00A00D26; // Fast Mode Plus
mbed_official 197:36a724675865 184 // Enable the Fast Mode Plus capability
mbed_official 197:36a724675865 185 if (obj->i2c == I2C_1) {
mbed_official 197:36a724675865 186 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, ENABLE);
mbed_official 197:36a724675865 187 }
mbed_official 197:36a724675865 188 if (obj->i2c == I2C_2) {
mbed_official 197:36a724675865 189 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, ENABLE);
mbed_official 197:36a724675865 190 }
mbed_official 197:36a724675865 191 break;
mbed_official 197:36a724675865 192 default:
mbed_official 197:36a724675865 193 error("Only 100kHz, 200kHz, 400kHz and 1MHz I2C frequencies are supported.");
mbed_official 197:36a724675865 194 break;
mbed_official 197:36a724675865 195 }
mbed_official 216:577900467c9e 196 } else {
mbed_official 197:36a724675865 197 error("System clock setting is not supported.");
mbed_official 125:23cc3068a9e4 198 }
mbed_official 135:067cc8ba23da 199
mbed_official 125:23cc3068a9e4 200 // I2C configuration
mbed_official 125:23cc3068a9e4 201 I2C_DeInit(i2c);
mbed_official 125:23cc3068a9e4 202 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 125:23cc3068a9e4 203 I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
mbed_official 125:23cc3068a9e4 204 I2C_InitStructure.I2C_DigitalFilter = 0x00;
mbed_official 125:23cc3068a9e4 205 I2C_InitStructure.I2C_OwnAddress1 = 0x00;
mbed_official 125:23cc3068a9e4 206 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 125:23cc3068a9e4 207 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 125:23cc3068a9e4 208 I2C_InitStructure.I2C_Timing = tim;
mbed_official 125:23cc3068a9e4 209 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 135:067cc8ba23da 210
mbed_official 125:23cc3068a9e4 211 I2C_Cmd(i2c, ENABLE);
mbed_official 125:23cc3068a9e4 212 }
mbed_official 125:23cc3068a9e4 213
mbed_official 125:23cc3068a9e4 214 inline int i2c_start(i2c_t *obj) {
mbed_official 125:23cc3068a9e4 215 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 125:23cc3068a9e4 216 int timeout;
mbed_official 125:23cc3068a9e4 217
mbed_official 125:23cc3068a9e4 218 // Test BUSY Flag
mbed_official 125:23cc3068a9e4 219 timeout = LONG_TIMEOUT;
mbed_official 125:23cc3068a9e4 220 while (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) != RESET) {
mbed_official 125:23cc3068a9e4 221 timeout--;
mbed_official 125:23cc3068a9e4 222 if (timeout == 0) {
mbed_official 125:23cc3068a9e4 223 return 0;
mbed_official 125:23cc3068a9e4 224 }
mbed_official 125:23cc3068a9e4 225 }
mbed_official 125:23cc3068a9e4 226
mbed_official 125:23cc3068a9e4 227 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 125:23cc3068a9e4 228
mbed_official 125:23cc3068a9e4 229 return 0;
mbed_official 125:23cc3068a9e4 230 }
mbed_official 125:23cc3068a9e4 231
mbed_official 125:23cc3068a9e4 232 inline int i2c_stop(i2c_t *obj) {
mbed_official 125:23cc3068a9e4 233 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 135:067cc8ba23da 234
mbed_official 125:23cc3068a9e4 235 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 135:067cc8ba23da 236
mbed_official 125:23cc3068a9e4 237 return 0;
mbed_official 125:23cc3068a9e4 238 }
mbed_official 125:23cc3068a9e4 239
mbed_official 197:36a724675865 240
mbed_official 125:23cc3068a9e4 241 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 125:23cc3068a9e4 242 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 125:23cc3068a9e4 243 int count;
mbed_official 197:36a724675865 244 int timeout;
mbed_official 125:23cc3068a9e4 245 int value;
mbed_official 135:067cc8ba23da 246
mbed_official 125:23cc3068a9e4 247 // Configure slave address, nbytes, reload, end mode and start or stop generation
mbed_official 197:36a724675865 248 I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Read);
mbed_official 135:067cc8ba23da 249
mbed_official 125:23cc3068a9e4 250 // Read all bytes
mbed_official 125:23cc3068a9e4 251 for (count = 0; count < length; count++) {
mbed_official 125:23cc3068a9e4 252 value = i2c_byte_read(obj, 0);
mbed_official 125:23cc3068a9e4 253 data[count] = (char)value;
mbed_official 125:23cc3068a9e4 254 }
mbed_official 135:067cc8ba23da 255
mbed_official 197:36a724675865 256 timeout = FLAG_TIMEOUT;
mbed_official 216:577900467c9e 257 while (!I2C_GetFlagStatus(i2c, I2C_FLAG_TC)) {
mbed_official 197:36a724675865 258 timeout--;
mbed_official 247:135e3186a638 259 if (timeout == 0) return -1;
mbed_official 197:36a724675865 260 }
mbed_official 216:577900467c9e 261
mbed_official 216:577900467c9e 262 if (stop) i2c_stop(obj);
mbed_official 197:36a724675865 263
mbed_official 125:23cc3068a9e4 264 return length;
mbed_official 125:23cc3068a9e4 265 }
mbed_official 125:23cc3068a9e4 266
mbed_official 197:36a724675865 267
mbed_official 125:23cc3068a9e4 268 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 125:23cc3068a9e4 269 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 197:36a724675865 270 int timeout;
mbed_official 125:23cc3068a9e4 271 int count;
mbed_official 135:067cc8ba23da 272
mbed_official 197:36a724675865 273 // Configure slave address, nbytes, reload, end mode and start generation
mbed_official 197:36a724675865 274 I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
mbed_official 135:067cc8ba23da 275
mbed_official 125:23cc3068a9e4 276 // Write all bytes
mbed_official 125:23cc3068a9e4 277 for (count = 0; count < length; count++) {
mbed_official 197:36a724675865 278 i2c_byte_write(obj, data[count]);
mbed_official 125:23cc3068a9e4 279 }
mbed_official 125:23cc3068a9e4 280
mbed_official 197:36a724675865 281 timeout = FLAG_TIMEOUT;
mbed_official 216:577900467c9e 282 while (!I2C_GetFlagStatus(i2c, I2C_FLAG_TC)) {
mbed_official 197:36a724675865 283 timeout--;
mbed_official 247:135e3186a638 284 if (timeout == 0) return -1;
mbed_official 125:23cc3068a9e4 285 }
mbed_official 216:577900467c9e 286
mbed_official 216:577900467c9e 287 if (stop) i2c_stop(obj);
mbed_official 135:067cc8ba23da 288
mbed_official 125:23cc3068a9e4 289 return count;
mbed_official 125:23cc3068a9e4 290 }
mbed_official 125:23cc3068a9e4 291
mbed_official 125:23cc3068a9e4 292 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 125:23cc3068a9e4 293 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 125:23cc3068a9e4 294 uint8_t data;
mbed_official 125:23cc3068a9e4 295 int timeout;
mbed_official 135:067cc8ba23da 296
mbed_official 125:23cc3068a9e4 297 // Wait until the byte is received
mbed_official 135:067cc8ba23da 298 timeout = FLAG_TIMEOUT;
mbed_official 125:23cc3068a9e4 299 while (I2C_GetFlagStatus(i2c, I2C_ISR_RXNE) == RESET) {
mbed_official 125:23cc3068a9e4 300 timeout--;
mbed_official 125:23cc3068a9e4 301 if (timeout == 0) {
mbed_official 247:135e3186a638 302 return -1;
mbed_official 125:23cc3068a9e4 303 }
mbed_official 125:23cc3068a9e4 304 }
mbed_official 125:23cc3068a9e4 305
mbed_official 125:23cc3068a9e4 306 data = I2C_ReceiveData(i2c);
mbed_official 135:067cc8ba23da 307
mbed_official 125:23cc3068a9e4 308 return (int)data;
mbed_official 125:23cc3068a9e4 309 }
mbed_official 125:23cc3068a9e4 310
mbed_official 125:23cc3068a9e4 311 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 125:23cc3068a9e4 312 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 125:23cc3068a9e4 313 int timeout;
mbed_official 125:23cc3068a9e4 314
mbed_official 125:23cc3068a9e4 315 // Wait until the previous byte is transmitted
mbed_official 125:23cc3068a9e4 316 timeout = FLAG_TIMEOUT;
mbed_official 125:23cc3068a9e4 317 while (I2C_GetFlagStatus(i2c, I2C_ISR_TXIS) == RESET) {
mbed_official 125:23cc3068a9e4 318 timeout--;
mbed_official 125:23cc3068a9e4 319 if (timeout == 0) {
mbed_official 125:23cc3068a9e4 320 return 0;
mbed_official 125:23cc3068a9e4 321 }
mbed_official 125:23cc3068a9e4 322 }
mbed_official 135:067cc8ba23da 323
mbed_official 125:23cc3068a9e4 324 I2C_SendData(i2c, (uint8_t)data);
mbed_official 135:067cc8ba23da 325
mbed_official 125:23cc3068a9e4 326 return 1;
mbed_official 125:23cc3068a9e4 327 }
mbed_official 125:23cc3068a9e4 328
mbed_official 125:23cc3068a9e4 329 void i2c_reset(i2c_t *obj) {
mbed_official 305:1f0269907d8b 330 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 305:1f0269907d8b 331 int timeout;
mbed_official 305:1f0269907d8b 332
mbed_official 305:1f0269907d8b 333 // wait before reset
mbed_official 305:1f0269907d8b 334 timeout = LONG_TIMEOUT;
mbed_official 305:1f0269907d8b 335 while((I2C_GetFlagStatus(i2c, I2C_FLAG_BUSY)) && (timeout-- != 0));
mbed_official 305:1f0269907d8b 336
mbed_official 135:067cc8ba23da 337 if (obj->i2c == I2C_1) {
mbed_official 125:23cc3068a9e4 338 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 125:23cc3068a9e4 339 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 125:23cc3068a9e4 340 }
mbed_official 125:23cc3068a9e4 341 if (obj->i2c == I2C_2) {
mbed_official 125:23cc3068a9e4 342 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 125:23cc3068a9e4 343 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 125:23cc3068a9e4 344 }
mbed_official 125:23cc3068a9e4 345 if (obj->i2c == I2C_3) {
mbed_official 125:23cc3068a9e4 346 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C3, ENABLE);
mbed_official 135:067cc8ba23da 347 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C3, DISABLE);
mbed_official 125:23cc3068a9e4 348 }
mbed_official 125:23cc3068a9e4 349 }
mbed_official 125:23cc3068a9e4 350
mbed_official 125:23cc3068a9e4 351 #if DEVICE_I2CSLAVE
mbed_official 125:23cc3068a9e4 352
mbed_official 125:23cc3068a9e4 353 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 125:23cc3068a9e4 354 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 125:23cc3068a9e4 355 uint16_t tmpreg;
mbed_official 135:067cc8ba23da 356
mbed_official 197:36a724675865 357 // reset own address enable
mbed_official 216:577900467c9e 358 i2c->OAR1 &= ~ I2C_OAR1_OA1EN;
mbed_official 216:577900467c9e 359
mbed_official 125:23cc3068a9e4 360 // Get the old register value
mbed_official 125:23cc3068a9e4 361 tmpreg = i2c->OAR1;
mbed_official 125:23cc3068a9e4 362 // Reset address bits
mbed_official 125:23cc3068a9e4 363 tmpreg &= 0xFC00;
mbed_official 125:23cc3068a9e4 364 // Set new address
mbed_official 125:23cc3068a9e4 365 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 125:23cc3068a9e4 366 // Store the new register value
mbed_official 197:36a724675865 367 i2c->OAR1 = tmpreg | I2C_OAR1_OA1EN;
mbed_official 125:23cc3068a9e4 368 }
mbed_official 125:23cc3068a9e4 369
mbed_official 125:23cc3068a9e4 370 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 125:23cc3068a9e4 371 // Nothing to do
mbed_official 125:23cc3068a9e4 372 }
mbed_official 125:23cc3068a9e4 373
mbed_official 125:23cc3068a9e4 374 // See I2CSlave.h
mbed_official 125:23cc3068a9e4 375 #define NoData 0 // the slave has not been addressed
mbed_official 125:23cc3068a9e4 376 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 125:23cc3068a9e4 377 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 125:23cc3068a9e4 378 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 125:23cc3068a9e4 379
mbed_official 125:23cc3068a9e4 380 int i2c_slave_receive(i2c_t *obj) {
mbed_official 197:36a724675865 381 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 197:36a724675865 382 int event = NoData;
mbed_official 216:577900467c9e 383
mbed_official 216:577900467c9e 384 if (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) == SET) {
mbed_official 216:577900467c9e 385 if (I2C_GetFlagStatus(i2c, I2C_ISR_ADDR) == SET) {
mbed_official 216:577900467c9e 386 // Check direction
mbed_official 197:36a724675865 387 if (I2C_GetFlagStatus(i2c, I2C_ISR_DIR) == SET) {
mbed_official 197:36a724675865 388 event = ReadAddressed;
mbed_official 216:577900467c9e 389 } else event = WriteAddressed;
mbed_official 216:577900467c9e 390 // Clear adress match flag to generate an acknowledge
mbed_official 216:577900467c9e 391 i2c->ICR |= I2C_ICR_ADDRCF;
mbed_official 197:36a724675865 392 }
mbed_official 197:36a724675865 393 }
mbed_official 197:36a724675865 394 return event;
mbed_official 125:23cc3068a9e4 395 }
mbed_official 125:23cc3068a9e4 396
mbed_official 125:23cc3068a9e4 397 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 125:23cc3068a9e4 398 int count = 0;
mbed_official 135:067cc8ba23da 399
mbed_official 125:23cc3068a9e4 400 // Read all bytes
mbed_official 125:23cc3068a9e4 401 for (count = 0; count < length; count++) {
mbed_official 125:23cc3068a9e4 402 data[count] = i2c_byte_read(obj, 0);
mbed_official 125:23cc3068a9e4 403 }
mbed_official 135:067cc8ba23da 404
mbed_official 125:23cc3068a9e4 405 return count;
mbed_official 125:23cc3068a9e4 406 }
mbed_official 125:23cc3068a9e4 407
mbed_official 125:23cc3068a9e4 408 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 125:23cc3068a9e4 409 int count = 0;
mbed_official 135:067cc8ba23da 410
mbed_official 125:23cc3068a9e4 411 // Write all bytes
mbed_official 125:23cc3068a9e4 412 for (count = 0; count < length; count++) {
mbed_official 125:23cc3068a9e4 413 i2c_byte_write(obj, data[count]);
mbed_official 125:23cc3068a9e4 414 }
mbed_official 135:067cc8ba23da 415
mbed_official 125:23cc3068a9e4 416 return count;
mbed_official 125:23cc3068a9e4 417 }
mbed_official 125:23cc3068a9e4 418
mbed_official 125:23cc3068a9e4 419
mbed_official 125:23cc3068a9e4 420 #endif // DEVICE_I2CSLAVE
mbed_official 125:23cc3068a9e4 421
mbed_official 125:23cc3068a9e4 422 #endif // DEVICE_I2C