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_F051R8/i2c_api.c@323:9e901b0a5aa1, 2014-09-13 (annotated)

Committer:
shaoziyang
Date:
Sat Sep 13 14:25:46 2014 +0000
Revision:
323:9e901b0a5aa1
Parent:
240:9a7c54113eaf 
test with CLOCK_SETUP = 0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 130:1dec54e4aec3 1 /* mbed Microcontroller Library
mbed_official 130:1dec54e4aec3 2 *******************************************************************************
mbed_official 130:1dec54e4aec3 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 130:1dec54e4aec3 4 * All rights reserved.
mbed_official 130:1dec54e4aec3 5 *
mbed_official 130:1dec54e4aec3 6 * Redistribution and use in source and binary forms, with or without
mbed_official 130:1dec54e4aec3 7 * modification, are permitted provided that the following conditions are met:
mbed_official 130:1dec54e4aec3 8 *
mbed_official 130:1dec54e4aec3 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 130:1dec54e4aec3 10 * this list of conditions and the following disclaimer.
mbed_official 130:1dec54e4aec3 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 130:1dec54e4aec3 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 130:1dec54e4aec3 13 * and/or other materials provided with the distribution.
mbed_official 130:1dec54e4aec3 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 130:1dec54e4aec3 15 * may be used to endorse or promote products derived from this software
mbed_official 130:1dec54e4aec3 16 * without specific prior written permission.
mbed_official 130:1dec54e4aec3 17 *
mbed_official 130:1dec54e4aec3 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 130:1dec54e4aec3 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 130:1dec54e4aec3 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 130:1dec54e4aec3 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 130:1dec54e4aec3 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 130:1dec54e4aec3 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 130:1dec54e4aec3 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 130:1dec54e4aec3 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 130:1dec54e4aec3 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 130:1dec54e4aec3 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 130:1dec54e4aec3 28 *******************************************************************************
mbed_official 130:1dec54e4aec3 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 130:1dec54e4aec3 31 #include "i2c_api.h"
mbed_official 130:1dec54e4aec3 32
mbed_official 130:1dec54e4aec3 33 #if DEVICE_I2C
mbed_official 130:1dec54e4aec3 34
mbed_official 130:1dec54e4aec3 35 #include "cmsis.h"
mbed_official 130:1dec54e4aec3 36 #include "pinmap.h"
mbed_official 130:1dec54e4aec3 37
mbed_official 130:1dec54e4aec3 38 /* Timeout values for flags and events waiting loops. These timeouts are
mbed_official 227:7bd0639b8911 39 not based on accurate values, they just guarantee that the application will
mbed_official 227:7bd0639b8911 40 not remain stuck if the I2C communication is corrupted. */
mbed_official 130:1dec54e4aec3 41 #define FLAG_TIMEOUT ((int)0x1000)
mbed_official 130:1dec54e4aec3 42 #define LONG_TIMEOUT ((int)0x8000)
mbed_official 130:1dec54e4aec3 43
mbed_official 130:1dec54e4aec3 44 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 240:9a7c54113eaf 45 {PB_7, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_1)},
mbed_official 130:1dec54e4aec3 46 {PB_9, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_1)},
mbed_official 240:9a7c54113eaf 47 {PB_11, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_1)},
mbed_official 130:1dec54e4aec3 48 {NC, NC, 0}
mbed_official 130:1dec54e4aec3 49 };
mbed_official 130:1dec54e4aec3 50
mbed_official 130:1dec54e4aec3 51 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 240:9a7c54113eaf 52 {PB_6, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_1)},
mbed_official 130:1dec54e4aec3 53 {PB_8, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_1)},
mbed_official 240:9a7c54113eaf 54 {PB_10, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_1)},
mbed_official 130:1dec54e4aec3 55 {NC, NC, 0}
mbed_official 130:1dec54e4aec3 56 };
mbed_official 130:1dec54e4aec3 57
mbed_official 227:7bd0639b8911 58 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 130:1dec54e4aec3 59 // Determine the I2C to use
mbed_official 130:1dec54e4aec3 60 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 130:1dec54e4aec3 61 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 130:1dec54e4aec3 62
mbed_official 130:1dec54e4aec3 63 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 64 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 130:1dec54e4aec3 65
mbed_official 130:1dec54e4aec3 66 // Enable I2C clock
mbed_official 227:7bd0639b8911 67 if (obj->i2c == I2C_1) {
mbed_official 130:1dec54e4aec3 68 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 240:9a7c54113eaf 69 RCC_I2CCLKConfig(RCC_I2C1CLK_SYSCLK);
mbed_official 130:1dec54e4aec3 70 }
mbed_official 240:9a7c54113eaf 71 if (obj->i2c == I2C_2) {
mbed_official 240:9a7c54113eaf 72 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 240:9a7c54113eaf 73 }
mbed_official 130:1dec54e4aec3 74
mbed_official 130:1dec54e4aec3 75 // Configure I2C pins
mbed_official 130:1dec54e4aec3 76 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 130:1dec54e4aec3 77 pin_mode(scl, OpenDrain);
mbed_official 130:1dec54e4aec3 78 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 130:1dec54e4aec3 79 pin_mode(sda, OpenDrain);
mbed_official 130:1dec54e4aec3 80
mbed_official 130:1dec54e4aec3 81 // Reset to clear pending flags if any
mbed_official 130:1dec54e4aec3 82 i2c_reset(obj);
mbed_official 130:1dec54e4aec3 83
mbed_official 130:1dec54e4aec3 84 // I2C configuration
mbed_official 227:7bd0639b8911 85 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 130:1dec54e4aec3 86 }
mbed_official 130:1dec54e4aec3 87
mbed_official 130:1dec54e4aec3 88 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 240:9a7c54113eaf 89 MBED_ASSERT((hz == 100000) || (hz == 200000) || (hz == 400000) || (hz == 1000000));
mbed_official 130:1dec54e4aec3 90 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 130:1dec54e4aec3 91 I2C_InitTypeDef I2C_InitStructure;
mbed_official 142:7f2b6c44bbe3 92 uint32_t tim = 0;
mbed_official 130:1dec54e4aec3 93
mbed_official 240:9a7c54113eaf 94 // Disable the Fast Mode Plus capability
mbed_official 240:9a7c54113eaf 95 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); // Enable SYSCFG clock
mbed_official 240:9a7c54113eaf 96 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, DISABLE);
mbed_official 240:9a7c54113eaf 97 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, DISABLE);
mbed_official 240:9a7c54113eaf 98
mbed_official 240:9a7c54113eaf 99 /*
mbed_official 240:9a7c54113eaf 100 Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
mbed_official 240:9a7c54113eaf 101 * Standard mode (up to 100 kHz)
mbed_official 240:9a7c54113eaf 102 * Fast Mode (up to 400 kHz)
mbed_official 240:9a7c54113eaf 103 * Fast Mode Plus (up to 1 MHz)
mbed_official 240:9a7c54113eaf 104 Below values obtained with:
mbed_official 240:9a7c54113eaf 105 - I2C clock source = 48 MHz (System Clock)
mbed_official 240:9a7c54113eaf 106 - Analog filter delay = ON
mbed_official 240:9a7c54113eaf 107 - Digital filter coefficient = 0
mbed_official 240:9a7c54113eaf 108 - Rise time = 100 ns
mbed_official 240:9a7c54113eaf 109 - Fall time = 10ns
mbed_official 240:9a7c54113eaf 110 */
mbed_official 130:1dec54e4aec3 111 switch (hz) {
mbed_official 130:1dec54e4aec3 112 case 100000:
mbed_official 240:9a7c54113eaf 113 tim = 0x10805E89; // Standard mode
mbed_official 130:1dec54e4aec3 114 break;
mbed_official 130:1dec54e4aec3 115 case 200000:
mbed_official 240:9a7c54113eaf 116 tim = 0x00905E82; // Fast Mode
mbed_official 130:1dec54e4aec3 117 break;
mbed_official 130:1dec54e4aec3 118 case 400000:
mbed_official 240:9a7c54113eaf 119 tim = 0x00901850; // Fast Mode
mbed_official 240:9a7c54113eaf 120 break;
mbed_official 240:9a7c54113eaf 121 case 1000000:
mbed_official 240:9a7c54113eaf 122 tim = 0x00700818; // Fast Mode Plus
mbed_official 240:9a7c54113eaf 123 // Enable the Fast Mode Plus capability
mbed_official 240:9a7c54113eaf 124 if (obj->i2c == I2C_1) {
mbed_official 240:9a7c54113eaf 125 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, ENABLE);
mbed_official 240:9a7c54113eaf 126 }
mbed_official 240:9a7c54113eaf 127 if (obj->i2c == I2C_2) {
mbed_official 240:9a7c54113eaf 128 SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, ENABLE);
mbed_official 240:9a7c54113eaf 129 }
mbed_official 130:1dec54e4aec3 130 break;
mbed_official 130:1dec54e4aec3 131 default:
mbed_official 130:1dec54e4aec3 132 break;
mbed_official 130:1dec54e4aec3 133 }
mbed_official 130:1dec54e4aec3 134
mbed_official 130:1dec54e4aec3 135 // I2C configuration
mbed_official 240:9a7c54113eaf 136 I2C_DeInit(i2c);
mbed_official 130:1dec54e4aec3 137 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 130:1dec54e4aec3 138 I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
mbed_official 130:1dec54e4aec3 139 I2C_InitStructure.I2C_DigitalFilter = 0x00;
mbed_official 130:1dec54e4aec3 140 I2C_InitStructure.I2C_OwnAddress1 = 0x00;
mbed_official 130:1dec54e4aec3 141 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 130:1dec54e4aec3 142 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 130:1dec54e4aec3 143 I2C_InitStructure.I2C_Timing = tim;
mbed_official 130:1dec54e4aec3 144 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 130:1dec54e4aec3 145
mbed_official 130:1dec54e4aec3 146 I2C_Cmd(i2c, ENABLE);
mbed_official 130:1dec54e4aec3 147 }
mbed_official 130:1dec54e4aec3 148
mbed_official 130:1dec54e4aec3 149 inline int i2c_start(i2c_t *obj) {
mbed_official 130:1dec54e4aec3 150 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 130:1dec54e4aec3 151 int timeout;
mbed_official 130:1dec54e4aec3 152
mbed_official 130:1dec54e4aec3 153 // Test BUSY Flag
mbed_official 130:1dec54e4aec3 154 timeout = LONG_TIMEOUT;
mbed_official 130:1dec54e4aec3 155 while (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) != RESET) {
mbed_official 130:1dec54e4aec3 156 timeout--;
mbed_official 130:1dec54e4aec3 157 if (timeout == 0) {
mbed_official 130:1dec54e4aec3 158 return 0;
mbed_official 130:1dec54e4aec3 159 }
mbed_official 130:1dec54e4aec3 160 }
mbed_official 130:1dec54e4aec3 161
mbed_official 130:1dec54e4aec3 162 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 130:1dec54e4aec3 163
mbed_official 130:1dec54e4aec3 164 return 0;
mbed_official 130:1dec54e4aec3 165 }
mbed_official 130:1dec54e4aec3 166
mbed_official 130:1dec54e4aec3 167 inline int i2c_stop(i2c_t *obj) {
mbed_official 130:1dec54e4aec3 168 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 130:1dec54e4aec3 169
mbed_official 130:1dec54e4aec3 170 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 130:1dec54e4aec3 171
mbed_official 130:1dec54e4aec3 172 return 0;
mbed_official 130:1dec54e4aec3 173 }
mbed_official 130:1dec54e4aec3 174
mbed_official 130:1dec54e4aec3 175 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 130:1dec54e4aec3 176 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 130:1dec54e4aec3 177 int count;
mbed_official 240:9a7c54113eaf 178 int timeout;
mbed_official 130:1dec54e4aec3 179 int value;
mbed_official 130:1dec54e4aec3 180
mbed_official 130:1dec54e4aec3 181 if (length == 0) return 0;
mbed_official 130:1dec54e4aec3 182
mbed_official 130:1dec54e4aec3 183 // Configure slave address, nbytes, reload, end mode and start or stop generation
mbed_official 240:9a7c54113eaf 184 I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Read);
mbed_official 130:1dec54e4aec3 185
mbed_official 130:1dec54e4aec3 186 // Read all bytes
mbed_official 130:1dec54e4aec3 187 for (count = 0; count < length; count++) {
mbed_official 130:1dec54e4aec3 188 value = i2c_byte_read(obj, 0);
mbed_official 130:1dec54e4aec3 189 data[count] = (char)value;
mbed_official 130:1dec54e4aec3 190 }
mbed_official 130:1dec54e4aec3 191
mbed_official 240:9a7c54113eaf 192 timeout = FLAG_TIMEOUT;
mbed_official 240:9a7c54113eaf 193 while (!I2C_GetFlagStatus(i2c, I2C_FLAG_TC)) {
mbed_official 240:9a7c54113eaf 194 timeout--;
mbed_official 240:9a7c54113eaf 195 if (timeout == 0) return 0;
mbed_official 240:9a7c54113eaf 196 }
mbed_official 240:9a7c54113eaf 197
mbed_official 240:9a7c54113eaf 198 if (stop) i2c_stop(obj);
mbed_official 240:9a7c54113eaf 199
mbed_official 130:1dec54e4aec3 200 return length;
mbed_official 130:1dec54e4aec3 201 }
mbed_official 130:1dec54e4aec3 202
mbed_official 130:1dec54e4aec3 203 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 130:1dec54e4aec3 204 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 240:9a7c54113eaf 205 int timeout;
mbed_official 130:1dec54e4aec3 206 int count;
mbed_official 130:1dec54e4aec3 207
mbed_official 130:1dec54e4aec3 208 if (length == 0) return 0;
mbed_official 130:1dec54e4aec3 209
mbed_official 240:9a7c54113eaf 210 // Configure slave address, nbytes, reload, end mode and start generation
mbed_official 240:9a7c54113eaf 211 I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
mbed_official 130:1dec54e4aec3 212
mbed_official 130:1dec54e4aec3 213 // Write all bytes
mbed_official 130:1dec54e4aec3 214 for (count = 0; count < length; count++) {
mbed_official 240:9a7c54113eaf 215 i2c_byte_write(obj, data[count]);
mbed_official 130:1dec54e4aec3 216 }
mbed_official 130:1dec54e4aec3 217
mbed_official 240:9a7c54113eaf 218 timeout = FLAG_TIMEOUT;
mbed_official 240:9a7c54113eaf 219 while (!I2C_GetFlagStatus(i2c, I2C_FLAG_TC)) {
mbed_official 130:1dec54e4aec3 220 timeout--;
mbed_official 240:9a7c54113eaf 221 if (timeout == 0) return 0;
mbed_official 130:1dec54e4aec3 222 }
mbed_official 240:9a7c54113eaf 223
mbed_official 240:9a7c54113eaf 224 if (stop) i2c_stop(obj);
mbed_official 130:1dec54e4aec3 225
mbed_official 130:1dec54e4aec3 226 return count;
mbed_official 130:1dec54e4aec3 227 }
mbed_official 130:1dec54e4aec3 228
mbed_official 130:1dec54e4aec3 229 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 130:1dec54e4aec3 230 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 130:1dec54e4aec3 231 uint8_t data;
mbed_official 130:1dec54e4aec3 232 int timeout;
mbed_official 130:1dec54e4aec3 233
mbed_official 130:1dec54e4aec3 234 // Wait until the byte is received
mbed_official 227:7bd0639b8911 235 timeout = FLAG_TIMEOUT;
mbed_official 130:1dec54e4aec3 236 while (I2C_GetFlagStatus(i2c, I2C_ISR_RXNE) == RESET) {
mbed_official 130:1dec54e4aec3 237 timeout--;
mbed_official 130:1dec54e4aec3 238 if (timeout == 0) {
mbed_official 130:1dec54e4aec3 239 return 0;
mbed_official 130:1dec54e4aec3 240 }
mbed_official 130:1dec54e4aec3 241 }
mbed_official 130:1dec54e4aec3 242
mbed_official 130:1dec54e4aec3 243 data = I2C_ReceiveData(i2c);
mbed_official 130:1dec54e4aec3 244
mbed_official 130:1dec54e4aec3 245 return (int)data;
mbed_official 130:1dec54e4aec3 246 }
mbed_official 130:1dec54e4aec3 247
mbed_official 130:1dec54e4aec3 248 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 130:1dec54e4aec3 249 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 130:1dec54e4aec3 250 int timeout;
mbed_official 130:1dec54e4aec3 251
mbed_official 130:1dec54e4aec3 252 // Wait until the previous byte is transmitted
mbed_official 130:1dec54e4aec3 253 timeout = FLAG_TIMEOUT;
mbed_official 130:1dec54e4aec3 254 while (I2C_GetFlagStatus(i2c, I2C_ISR_TXIS) == RESET) {
mbed_official 130:1dec54e4aec3 255 timeout--;
mbed_official 130:1dec54e4aec3 256 if (timeout == 0) {
mbed_official 130:1dec54e4aec3 257 return 0;
mbed_official 130:1dec54e4aec3 258 }
mbed_official 130:1dec54e4aec3 259 }
mbed_official 130:1dec54e4aec3 260
mbed_official 130:1dec54e4aec3 261 I2C_SendData(i2c, (uint8_t)data);
mbed_official 130:1dec54e4aec3 262
mbed_official 130:1dec54e4aec3 263 return 1;
mbed_official 130:1dec54e4aec3 264 }
mbed_official 130:1dec54e4aec3 265
mbed_official 130:1dec54e4aec3 266 void i2c_reset(i2c_t *obj) {
mbed_official 227:7bd0639b8911 267 if (obj->i2c == I2C_1) {
mbed_official 130:1dec54e4aec3 268 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 130:1dec54e4aec3 269 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 130:1dec54e4aec3 270 }
mbed_official 240:9a7c54113eaf 271 if (obj->i2c == I2C_2) {
mbed_official 240:9a7c54113eaf 272 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 240:9a7c54113eaf 273 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 240:9a7c54113eaf 274 }
mbed_official 130:1dec54e4aec3 275 }
mbed_official 130:1dec54e4aec3 276
mbed_official 130:1dec54e4aec3 277 #if DEVICE_I2CSLAVE
mbed_official 130:1dec54e4aec3 278
mbed_official 130:1dec54e4aec3 279 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 130:1dec54e4aec3 280 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 130:1dec54e4aec3 281 uint16_t tmpreg;
mbed_official 130:1dec54e4aec3 282
mbed_official 240:9a7c54113eaf 283 // reset own address enable
mbed_official 240:9a7c54113eaf 284 i2c->OAR1 &= ~ I2C_OAR1_OA1EN;
mbed_official 240:9a7c54113eaf 285
mbed_official 130:1dec54e4aec3 286 // Get the old register value
mbed_official 130:1dec54e4aec3 287 tmpreg = i2c->OAR1;
mbed_official 130:1dec54e4aec3 288 // Reset address bits
mbed_official 130:1dec54e4aec3 289 tmpreg &= 0xFC00;
mbed_official 130:1dec54e4aec3 290 // Set new address
mbed_official 130:1dec54e4aec3 291 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 130:1dec54e4aec3 292 // Store the new register value
mbed_official 240:9a7c54113eaf 293 i2c->OAR1 = tmpreg | I2C_OAR1_OA1EN;
mbed_official 130:1dec54e4aec3 294 }
mbed_official 130:1dec54e4aec3 295
mbed_official 130:1dec54e4aec3 296 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 130:1dec54e4aec3 297 // Nothing to do
mbed_official 130:1dec54e4aec3 298 }
mbed_official 130:1dec54e4aec3 299
mbed_official 130:1dec54e4aec3 300 // See I2CSlave.h
mbed_official 130:1dec54e4aec3 301 #define NoData 0 // the slave has not been addressed
mbed_official 130:1dec54e4aec3 302 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 130:1dec54e4aec3 303 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 130:1dec54e4aec3 304 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 130:1dec54e4aec3 305
mbed_official 130:1dec54e4aec3 306 int i2c_slave_receive(i2c_t *obj) {
mbed_official 240:9a7c54113eaf 307 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 240:9a7c54113eaf 308 int event = NoData;
mbed_official 240:9a7c54113eaf 309
mbed_official 240:9a7c54113eaf 310 if (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) == SET) {
mbed_official 240:9a7c54113eaf 311 if (I2C_GetFlagStatus(i2c, I2C_ISR_ADDR) == SET) {
mbed_official 240:9a7c54113eaf 312 // Check direction
mbed_official 240:9a7c54113eaf 313 if (I2C_GetFlagStatus(i2c, I2C_ISR_DIR) == SET) {
mbed_official 240:9a7c54113eaf 314 event = ReadAddressed;
mbed_official 240:9a7c54113eaf 315 } else event = WriteAddressed;
mbed_official 240:9a7c54113eaf 316 // Clear adress match flag to generate an acknowledge
mbed_official 240:9a7c54113eaf 317 i2c->ICR |= I2C_ICR_ADDRCF;
mbed_official 240:9a7c54113eaf 318 }
mbed_official 240:9a7c54113eaf 319 }
mbed_official 240:9a7c54113eaf 320 return event;
mbed_official 130:1dec54e4aec3 321 }
mbed_official 130:1dec54e4aec3 322
mbed_official 130:1dec54e4aec3 323 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 130:1dec54e4aec3 324 int count = 0;
mbed_official 130:1dec54e4aec3 325
mbed_official 130:1dec54e4aec3 326 // Read all bytes
mbed_official 130:1dec54e4aec3 327 for (count = 0; count < length; count++) {
mbed_official 130:1dec54e4aec3 328 data[count] = i2c_byte_read(obj, 0);
mbed_official 130:1dec54e4aec3 329 }
mbed_official 130:1dec54e4aec3 330
mbed_official 130:1dec54e4aec3 331 return count;
mbed_official 130:1dec54e4aec3 332 }
mbed_official 130:1dec54e4aec3 333
mbed_official 130:1dec54e4aec3 334 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 130:1dec54e4aec3 335 int count = 0;
mbed_official 130:1dec54e4aec3 336
mbed_official 130:1dec54e4aec3 337 // Write all bytes
mbed_official 130:1dec54e4aec3 338 for (count = 0; count < length; count++) {
mbed_official 130:1dec54e4aec3 339 i2c_byte_write(obj, data[count]);
mbed_official 130:1dec54e4aec3 340 }
mbed_official 130:1dec54e4aec3 341
mbed_official 130:1dec54e4aec3 342 return count;
mbed_official 130:1dec54e4aec3 343 }
mbed_official 130:1dec54e4aec3 344
mbed_official 130:1dec54e4aec3 345
mbed_official 130:1dec54e4aec3 346 #endif // DEVICE_I2CSLAVE
mbed_official 130:1dec54e4aec3 347
mbed_official 130:1dec54e4aec3 348 #endif // DEVICE_I2C