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_DISCO_F303VC/i2c_api.c@241:ffe41b0c8126, 2014-06-26 (annotated)

Committer:
mbed_official
Date:
Thu Jun 26 10:30:09 2014 +0100
Revision:
241:ffe41b0c8126
Parent:
227:7bd0639b8911
Child:
250:a49055e7a707
Synchronized with git revision 9fec469ec63095abac767a4581abba008ffddf14



Full URL: https://github.com/mbedmicro/mbed/commit/9fec469ec63095abac767a4581abba008ffddf14/



[DISCO-F303VC] Updated with F302R8 recent changes

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 157:90e3acc479a2 1 /* mbed Microcontroller Library
mbed_official 157:90e3acc479a2 2 *******************************************************************************
mbed_official 157:90e3acc479a2 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 157:90e3acc479a2 4 * All rights reserved.
mbed_official 157:90e3acc479a2 5 *
mbed_official 157:90e3acc479a2 6 * Redistribution and use in source and binary forms, with or without
mbed_official 157:90e3acc479a2 7 * modification, are permitted provided that the following conditions are met:
mbed_official 157:90e3acc479a2 8 *
mbed_official 157:90e3acc479a2 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 157:90e3acc479a2 10 * this list of conditions and the following disclaimer.
mbed_official 157:90e3acc479a2 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 157:90e3acc479a2 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 157:90e3acc479a2 13 * and/or other materials provided with the distribution.
mbed_official 157:90e3acc479a2 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 157:90e3acc479a2 15 * may be used to endorse or promote products derived from this software
mbed_official 157:90e3acc479a2 16 * without specific prior written permission.
mbed_official 157:90e3acc479a2 17 *
mbed_official 157:90e3acc479a2 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 157:90e3acc479a2 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 157:90e3acc479a2 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 157:90e3acc479a2 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 157:90e3acc479a2 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 157:90e3acc479a2 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 157:90e3acc479a2 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 157:90e3acc479a2 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 157:90e3acc479a2 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 157:90e3acc479a2 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 157:90e3acc479a2 28 *******************************************************************************
mbed_official 157:90e3acc479a2 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 157:90e3acc479a2 31 #include "i2c_api.h"
mbed_official 157:90e3acc479a2 32
mbed_official 157:90e3acc479a2 33 #if DEVICE_I2C
mbed_official 157:90e3acc479a2 34
mbed_official 157:90e3acc479a2 35 #include "cmsis.h"
mbed_official 157:90e3acc479a2 36 #include "pinmap.h"
mbed_official 241:ffe41b0c8126 37 #include "error.h"
mbed_official 157:90e3acc479a2 38
mbed_official 157:90e3acc479a2 39 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 227:7bd0639b8911 40 not based on accurate values, they just guarantee that the application will
mbed_official 227:7bd0639b8911 41 not remain stuck if the I2C communication is corrupted. */
mbed_official 157:90e3acc479a2 42 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 157:90e3acc479a2 43 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 157:90e3acc479a2 44
mbed_official 157:90e3acc479a2 45 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 157:90e3acc479a2 46 {PA_10, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 157:90e3acc479a2 47 {PA_14, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 157:90e3acc479a2 48 {PB_5, I2C_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_8)},
mbed_official 157:90e3acc479a2 49 {PB_7, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 157:90e3acc479a2 50 {PB_9, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 157:90e3acc479a2 51 {PC_9, I2C_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_3)},
mbed_official 157:90e3acc479a2 52 {PF_0, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 157:90e3acc479a2 53 {NC, NC, 0}
mbed_official 157:90e3acc479a2 54 };
mbed_official 157:90e3acc479a2 55
mbed_official 157:90e3acc479a2 56 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 157:90e3acc479a2 57 {PA_8, I2C_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_3)},
mbed_official 157:90e3acc479a2 58 {PA_9, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 157:90e3acc479a2 59 {PA_15, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 157:90e3acc479a2 60 {PB_6, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 157:90e3acc479a2 61 {PB_8, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 157:90e3acc479a2 62 {PF_1, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
mbed_official 157:90e3acc479a2 63 {NC, NC, 0}
mbed_official 157:90e3acc479a2 64 };
mbed_official 157:90e3acc479a2 65
mbed_official 227:7bd0639b8911 66 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 157:90e3acc479a2 67 // Determine the I2C to use
mbed_official 157:90e3acc479a2 68 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 157:90e3acc479a2 69 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 157:90e3acc479a2 70
mbed_official 157:90e3acc479a2 71 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 72 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 157:90e3acc479a2 73
mbed_official 157:90e3acc479a2 74 // Enable I2C clock
mbed_official 227:7bd0639b8911 75 if (obj->i2c == I2C_1) {
mbed_official 157:90e3acc479a2 76 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 241:ffe41b0c8126 77 RCC_I2CCLKConfig(RCC_I2C1CLK_SYSCLK);
mbed_official 157:90e3acc479a2 78 }
mbed_official 157:90e3acc479a2 79 if (obj->i2c == I2C_2) {
mbed_official 157:90e3acc479a2 80 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 157:90e3acc479a2 81 }
mbed_official 157:90e3acc479a2 82 if (obj->i2c == I2C_3) {
mbed_official 157:90e3acc479a2 83 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C3, ENABLE);
mbed_official 157:90e3acc479a2 84 }
mbed_official 157:90e3acc479a2 85
mbed_official 157:90e3acc479a2 86 // Configure I2C pins
mbed_official 157:90e3acc479a2 87 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 157:90e3acc479a2 88 pin_mode(scl, OpenDrain);
mbed_official 157:90e3acc479a2 89 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 157:90e3acc479a2 90 pin_mode(sda, OpenDrain);
mbed_official 157:90e3acc479a2 91
mbed_official 157:90e3acc479a2 92 // Reset to clear pending flags if any
mbed_official 157:90e3acc479a2 93 i2c_reset(obj);
mbed_official 157:90e3acc479a2 94
mbed_official 157:90e3acc479a2 95 // I2C configuration
mbed_official 227:7bd0639b8911 96 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 157:90e3acc479a2 97 }
mbed_official 157:90e3acc479a2 98
mbed_official 157:90e3acc479a2 99 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 157:90e3acc479a2 100 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 157:90e3acc479a2 101 I2C_InitTypeDef I2C_InitStructure;
mbed_official 241:ffe41b0c8126 102 uint32_t tim = 0;
mbed_official 157:90e3acc479a2 103
mbed_official 157:90e3acc479a2 104 // Disable the Fast Mode Plus capability
mbed_official 157:90e3acc479a2 105 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); // Enable SYSCFG clock
mbed_official 157:90e3acc479a2 106 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, DISABLE);
mbed_official 157:90e3acc479a2 107 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, DISABLE);
mbed_official 157:90e3acc479a2 108
mbed_official 157:90e3acc479a2 109 /*
mbed_official 157:90e3acc479a2 110 Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
mbed_official 157:90e3acc479a2 111 * Standard mode (up to 100 kHz)
mbed_official 157:90e3acc479a2 112 * Fast Mode (up to 400 kHz)
mbed_official 157:90e3acc479a2 113 * Fast Mode Plus (up to 1 MHz)
mbed_official 157:90e3acc479a2 114 Below values obtained with:
mbed_official 241:ffe41b0c8126 115 - I2C clock source = 64 MHz (System Clock w/ HSI) or 72 (System Clock w/ HSE)
mbed_official 157:90e3acc479a2 116 - Analog filter delay = ON
mbed_official 157:90e3acc479a2 117 - Digital filter coefficient = 0
mbed_official 157:90e3acc479a2 118 - Rise time = 100 ns
mbed_official 157:90e3acc479a2 119 - Fall time = 10ns
mbed_official 157:90e3acc479a2 120 */
mbed_official 241:ffe41b0c8126 121 if (SystemCoreClock == 64000000) {
mbed_official 157:90e3acc479a2 122 switch (hz) {
mbed_official 157:90e3acc479a2 123 case 100000:
mbed_official 241:ffe41b0c8126 124 tim = 0x60302730; // Standard mode
mbed_official 157:90e3acc479a2 125 break;
mbed_official 157:90e3acc479a2 126 case 200000:
mbed_official 241:ffe41b0c8126 127 tim = 0x00C07AB3; // Fast Mode
mbed_official 157:90e3acc479a2 128 break;
mbed_official 157:90e3acc479a2 129 case 400000:
mbed_official 241:ffe41b0c8126 130 tim = 0x00C0216C; // Fast Mode
mbed_official 157:90e3acc479a2 131 break;
mbed_official 157:90e3acc479a2 132 case 1000000:
mbed_official 241:ffe41b0c8126 133 tim = 0x00900B22; // Fast Mode Plus
mbed_official 157:90e3acc479a2 134 // Enable the Fast Mode Plus capability
mbed_official 157:90e3acc479a2 135 if (obj->i2c == I2C_1) {
mbed_official 157:90e3acc479a2 136 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, ENABLE);
mbed_official 157:90e3acc479a2 137 }
mbed_official 157:90e3acc479a2 138 if (obj->i2c == I2C_2) {
mbed_official 157:90e3acc479a2 139 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, ENABLE);
mbed_official 157:90e3acc479a2 140 }
mbed_official 157:90e3acc479a2 141 break;
mbed_official 157:90e3acc479a2 142 default:
mbed_official 241:ffe41b0c8126 143 error("Only 100kHz, 200kHz, 400kHz and 1MHz I2C frequencies are supported.");
mbed_official 157:90e3acc479a2 144 break;
mbed_official 157:90e3acc479a2 145 }
mbed_official 241:ffe41b0c8126 146 } else if (SystemCoreClock == 72000000) {
mbed_official 241:ffe41b0c8126 147 switch (hz) {
mbed_official 241:ffe41b0c8126 148 case 100000:
mbed_official 241:ffe41b0c8126 149 tim = 0x10C08DCF; // Standard mode
mbed_official 241:ffe41b0c8126 150 break;
mbed_official 241:ffe41b0c8126 151 case 200000:
mbed_official 241:ffe41b0c8126 152 tim = 0xA010031A; // Fast Mode
mbed_official 241:ffe41b0c8126 153 break;
mbed_official 241:ffe41b0c8126 154 case 400000:
mbed_official 241:ffe41b0c8126 155 tim = 0x00E0257A; // Fast Mode
mbed_official 241:ffe41b0c8126 156 break;
mbed_official 241:ffe41b0c8126 157 case 1000000:
mbed_official 241:ffe41b0c8126 158 tim = 0x00A00D26; // Fast Mode Plus
mbed_official 241:ffe41b0c8126 159 // Enable the Fast Mode Plus capability
mbed_official 241:ffe41b0c8126 160 if (obj->i2c == I2C_1) {
mbed_official 241:ffe41b0c8126 161 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, ENABLE);
mbed_official 241:ffe41b0c8126 162 }
mbed_official 241:ffe41b0c8126 163 if (obj->i2c == I2C_2) {
mbed_official 241:ffe41b0c8126 164 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, ENABLE);
mbed_official 241:ffe41b0c8126 165 }
mbed_official 241:ffe41b0c8126 166 break;
mbed_official 241:ffe41b0c8126 167 default:
mbed_official 241:ffe41b0c8126 168 error("Only 100kHz, 200kHz, 400kHz and 1MHz I2C frequencies are supported.");
mbed_official 241:ffe41b0c8126 169 break;
mbed_official 241:ffe41b0c8126 170 }
mbed_official 241:ffe41b0c8126 171 } else {
mbed_official 241:ffe41b0c8126 172 error("System clock setting is not supported.");
mbed_official 241:ffe41b0c8126 173 }
mbed_official 157:90e3acc479a2 174
mbed_official 157:90e3acc479a2 175 // I2C configuration
mbed_official 157:90e3acc479a2 176 I2C_DeInit(i2c);
mbed_official 157:90e3acc479a2 177 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 157:90e3acc479a2 178 I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
mbed_official 157:90e3acc479a2 179 I2C_InitStructure.I2C_DigitalFilter = 0x00;
mbed_official 157:90e3acc479a2 180 I2C_InitStructure.I2C_OwnAddress1 = 0x00;
mbed_official 157:90e3acc479a2 181 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 157:90e3acc479a2 182 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 157:90e3acc479a2 183 I2C_InitStructure.I2C_Timing = tim;
mbed_official 157:90e3acc479a2 184 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 157:90e3acc479a2 185
mbed_official 157:90e3acc479a2 186 I2C_Cmd(i2c, ENABLE);
mbed_official 157:90e3acc479a2 187 }
mbed_official 157:90e3acc479a2 188
mbed_official 157:90e3acc479a2 189 inline int i2c_start(i2c_t *obj) {
mbed_official 157:90e3acc479a2 190 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 157:90e3acc479a2 191 int timeout;
mbed_official 157:90e3acc479a2 192
mbed_official 157:90e3acc479a2 193 // Test BUSY Flag
mbed_official 157:90e3acc479a2 194 timeout = LONG_TIMEOUT;
mbed_official 157:90e3acc479a2 195 while (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) != RESET) {
mbed_official 157:90e3acc479a2 196 timeout--;
mbed_official 157:90e3acc479a2 197 if (timeout == 0) {
mbed_official 157:90e3acc479a2 198 return 0;
mbed_official 157:90e3acc479a2 199 }
mbed_official 157:90e3acc479a2 200 }
mbed_official 157:90e3acc479a2 201
mbed_official 157:90e3acc479a2 202 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 157:90e3acc479a2 203
mbed_official 157:90e3acc479a2 204 return 0;
mbed_official 157:90e3acc479a2 205 }
mbed_official 157:90e3acc479a2 206
mbed_official 157:90e3acc479a2 207 inline int i2c_stop(i2c_t *obj) {
mbed_official 157:90e3acc479a2 208 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 157:90e3acc479a2 209
mbed_official 157:90e3acc479a2 210 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 157:90e3acc479a2 211
mbed_official 157:90e3acc479a2 212 return 0;
mbed_official 157:90e3acc479a2 213 }
mbed_official 157:90e3acc479a2 214
mbed_official 157:90e3acc479a2 215 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 157:90e3acc479a2 216 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 157:90e3acc479a2 217 int count;
mbed_official 241:ffe41b0c8126 218 int timeout;
mbed_official 157:90e3acc479a2 219 int value;
mbed_official 157:90e3acc479a2 220
mbed_official 157:90e3acc479a2 221 if (length == 0) return 0;
mbed_official 157:90e3acc479a2 222
mbed_official 157:90e3acc479a2 223 // Configure slave address, nbytes, reload, end mode and start or stop generation
mbed_official 241:ffe41b0c8126 224 I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Read);
mbed_official 157:90e3acc479a2 225
mbed_official 157:90e3acc479a2 226 // Read all bytes
mbed_official 157:90e3acc479a2 227 for (count = 0; count < length; count++) {
mbed_official 157:90e3acc479a2 228 value = i2c_byte_read(obj, 0);
mbed_official 157:90e3acc479a2 229 data[count] = (char)value;
mbed_official 157:90e3acc479a2 230 }
mbed_official 157:90e3acc479a2 231
mbed_official 241:ffe41b0c8126 232 timeout = FLAG_TIMEOUT;
mbed_official 241:ffe41b0c8126 233 while (!I2C_GetFlagStatus(i2c, I2C_FLAG_TC)) {
mbed_official 241:ffe41b0c8126 234 timeout--;
mbed_official 241:ffe41b0c8126 235 if (timeout == 0) return 0;
mbed_official 241:ffe41b0c8126 236 }
mbed_official 241:ffe41b0c8126 237
mbed_official 241:ffe41b0c8126 238 if (stop) i2c_stop(obj);
mbed_official 241:ffe41b0c8126 239
mbed_official 157:90e3acc479a2 240 return length;
mbed_official 157:90e3acc479a2 241 }
mbed_official 157:90e3acc479a2 242
mbed_official 157:90e3acc479a2 243 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 157:90e3acc479a2 244 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 241:ffe41b0c8126 245 int timeout;
mbed_official 157:90e3acc479a2 246 int count;
mbed_official 157:90e3acc479a2 247
mbed_official 157:90e3acc479a2 248 if (length == 0) return 0;
mbed_official 157:90e3acc479a2 249
mbed_official 241:ffe41b0c8126 250 // Configure slave address, nbytes, reload, end mode and start generation
mbed_official 241:ffe41b0c8126 251 I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
mbed_official 157:90e3acc479a2 252
mbed_official 157:90e3acc479a2 253 // Write all bytes
mbed_official 157:90e3acc479a2 254 for (count = 0; count < length; count++) {
mbed_official 241:ffe41b0c8126 255 i2c_byte_write(obj, data[count]);
mbed_official 157:90e3acc479a2 256 }
mbed_official 157:90e3acc479a2 257
mbed_official 241:ffe41b0c8126 258 timeout = FLAG_TIMEOUT;
mbed_official 241:ffe41b0c8126 259 while (!I2C_GetFlagStatus(i2c, I2C_FLAG_TC)) {
mbed_official 157:90e3acc479a2 260 timeout--;
mbed_official 241:ffe41b0c8126 261 if (timeout == 0) return 0;
mbed_official 157:90e3acc479a2 262 }
mbed_official 241:ffe41b0c8126 263
mbed_official 241:ffe41b0c8126 264 if (stop) i2c_stop(obj);
mbed_official 157:90e3acc479a2 265
mbed_official 157:90e3acc479a2 266 return count;
mbed_official 157:90e3acc479a2 267 }
mbed_official 157:90e3acc479a2 268
mbed_official 157:90e3acc479a2 269 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 157:90e3acc479a2 270 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 157:90e3acc479a2 271 uint8_t data;
mbed_official 157:90e3acc479a2 272 int timeout;
mbed_official 157:90e3acc479a2 273
mbed_official 157:90e3acc479a2 274 // Wait until the byte is received
mbed_official 227:7bd0639b8911 275 timeout = FLAG_TIMEOUT;
mbed_official 157:90e3acc479a2 276 while (I2C_GetFlagStatus(i2c, I2C_ISR_RXNE) == RESET) {
mbed_official 157:90e3acc479a2 277 timeout--;
mbed_official 157:90e3acc479a2 278 if (timeout == 0) {
mbed_official 157:90e3acc479a2 279 return 0;
mbed_official 157:90e3acc479a2 280 }
mbed_official 157:90e3acc479a2 281 }
mbed_official 157:90e3acc479a2 282
mbed_official 157:90e3acc479a2 283 data = I2C_ReceiveData(i2c);
mbed_official 157:90e3acc479a2 284
mbed_official 157:90e3acc479a2 285 return (int)data;
mbed_official 157:90e3acc479a2 286 }
mbed_official 157:90e3acc479a2 287
mbed_official 157:90e3acc479a2 288 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 157:90e3acc479a2 289 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 157:90e3acc479a2 290 int timeout;
mbed_official 157:90e3acc479a2 291
mbed_official 157:90e3acc479a2 292 // Wait until the previous byte is transmitted
mbed_official 157:90e3acc479a2 293 timeout = FLAG_TIMEOUT;
mbed_official 157:90e3acc479a2 294 while (I2C_GetFlagStatus(i2c, I2C_ISR_TXIS) == RESET) {
mbed_official 157:90e3acc479a2 295 timeout--;
mbed_official 157:90e3acc479a2 296 if (timeout == 0) {
mbed_official 157:90e3acc479a2 297 return 0;
mbed_official 157:90e3acc479a2 298 }
mbed_official 157:90e3acc479a2 299 }
mbed_official 157:90e3acc479a2 300
mbed_official 157:90e3acc479a2 301 I2C_SendData(i2c, (uint8_t)data);
mbed_official 157:90e3acc479a2 302
mbed_official 157:90e3acc479a2 303 return 1;
mbed_official 157:90e3acc479a2 304 }
mbed_official 157:90e3acc479a2 305
mbed_official 157:90e3acc479a2 306 void i2c_reset(i2c_t *obj) {
mbed_official 227:7bd0639b8911 307 if (obj->i2c == I2C_1) {
mbed_official 157:90e3acc479a2 308 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 157:90e3acc479a2 309 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 157:90e3acc479a2 310 }
mbed_official 157:90e3acc479a2 311 if (obj->i2c == I2C_2) {
mbed_official 157:90e3acc479a2 312 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 157:90e3acc479a2 313 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 157:90e3acc479a2 314 }
mbed_official 157:90e3acc479a2 315 if (obj->i2c == I2C_3) {
mbed_official 157:90e3acc479a2 316 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C3, ENABLE);
mbed_official 227:7bd0639b8911 317 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C3, DISABLE);
mbed_official 157:90e3acc479a2 318 }
mbed_official 157:90e3acc479a2 319 }
mbed_official 157:90e3acc479a2 320
mbed_official 157:90e3acc479a2 321 #if DEVICE_I2CSLAVE
mbed_official 157:90e3acc479a2 322
mbed_official 157:90e3acc479a2 323 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 157:90e3acc479a2 324 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 157:90e3acc479a2 325 uint16_t tmpreg;
mbed_official 157:90e3acc479a2 326
mbed_official 241:ffe41b0c8126 327 // reset own address enable
mbed_official 241:ffe41b0c8126 328 i2c->OAR1 &= ~ I2C_OAR1_OA1EN;
mbed_official 241:ffe41b0c8126 329
mbed_official 157:90e3acc479a2 330 // Get the old register value
mbed_official 157:90e3acc479a2 331 tmpreg = i2c->OAR1;
mbed_official 157:90e3acc479a2 332 // Reset address bits
mbed_official 157:90e3acc479a2 333 tmpreg &= 0xFC00;
mbed_official 157:90e3acc479a2 334 // Set new address
mbed_official 157:90e3acc479a2 335 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 157:90e3acc479a2 336 // Store the new register value
mbed_official 241:ffe41b0c8126 337 i2c->OAR1 = tmpreg | I2C_OAR1_OA1EN;
mbed_official 157:90e3acc479a2 338 }
mbed_official 157:90e3acc479a2 339
mbed_official 157:90e3acc479a2 340 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 157:90e3acc479a2 341 // Nothing to do
mbed_official 157:90e3acc479a2 342 }
mbed_official 157:90e3acc479a2 343
mbed_official 157:90e3acc479a2 344 // See I2CSlave.h
mbed_official 157:90e3acc479a2 345 #define NoData 0 // the slave has not been addressed
mbed_official 157:90e3acc479a2 346 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 157:90e3acc479a2 347 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 157:90e3acc479a2 348 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 157:90e3acc479a2 349
mbed_official 157:90e3acc479a2 350 int i2c_slave_receive(i2c_t *obj) {
mbed_official 241:ffe41b0c8126 351 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 241:ffe41b0c8126 352 int event = NoData;
mbed_official 241:ffe41b0c8126 353
mbed_official 241:ffe41b0c8126 354 if (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) == SET) {
mbed_official 241:ffe41b0c8126 355 if (I2C_GetFlagStatus(i2c, I2C_ISR_ADDR) == SET) {
mbed_official 241:ffe41b0c8126 356 // Check direction
mbed_official 241:ffe41b0c8126 357 if (I2C_GetFlagStatus(i2c, I2C_ISR_DIR) == SET) {
mbed_official 241:ffe41b0c8126 358 event = ReadAddressed;
mbed_official 241:ffe41b0c8126 359 } else event = WriteAddressed;
mbed_official 241:ffe41b0c8126 360 // Clear adress match flag to generate an acknowledge
mbed_official 241:ffe41b0c8126 361 i2c->ICR |= I2C_ICR_ADDRCF;
mbed_official 241:ffe41b0c8126 362 }
mbed_official 241:ffe41b0c8126 363 }
mbed_official 241:ffe41b0c8126 364 return event;
mbed_official 157:90e3acc479a2 365 }
mbed_official 157:90e3acc479a2 366
mbed_official 157:90e3acc479a2 367 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 157:90e3acc479a2 368 int count = 0;
mbed_official 157:90e3acc479a2 369
mbed_official 157:90e3acc479a2 370 // Read all bytes
mbed_official 157:90e3acc479a2 371 for (count = 0; count < length; count++) {
mbed_official 157:90e3acc479a2 372 data[count] = i2c_byte_read(obj, 0);
mbed_official 157:90e3acc479a2 373 }
mbed_official 157:90e3acc479a2 374
mbed_official 157:90e3acc479a2 375 return count;
mbed_official 157:90e3acc479a2 376 }
mbed_official 157:90e3acc479a2 377
mbed_official 157:90e3acc479a2 378 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 157:90e3acc479a2 379 int count = 0;
mbed_official 157:90e3acc479a2 380
mbed_official 157:90e3acc479a2 381 // Write all bytes
mbed_official 157:90e3acc479a2 382 for (count = 0; count < length; count++) {
mbed_official 157:90e3acc479a2 383 i2c_byte_write(obj, data[count]);
mbed_official 157:90e3acc479a2 384 }
mbed_official 157:90e3acc479a2 385
mbed_official 157:90e3acc479a2 386 return count;
mbed_official 157:90e3acc479a2 387 }
mbed_official 157:90e3acc479a2 388
mbed_official 157:90e3acc479a2 389
mbed_official 157:90e3acc479a2 390 #endif // DEVICE_I2CSLAVE
mbed_official 157:90e3acc479a2 391
mbed_official 157:90e3acc479a2 392 #endif // DEVICE_I2C