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@227:7bd0639b8911, 2014-06-11 (annotated)

Committer:
mbed_official
Date:
Wed Jun 11 16:00:09 2014 +0100
Revision:
227:7bd0639b8911
Parent:
142:7f2b6c44bbe3
Child:
240:9a7c54113eaf
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 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 130:1dec54e4aec3 45 {PB_9, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_1)},
mbed_official 130:1dec54e4aec3 46 {NC, NC, 0}
mbed_official 130:1dec54e4aec3 47 };
mbed_official 130:1dec54e4aec3 48
mbed_official 130:1dec54e4aec3 49 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 130:1dec54e4aec3 50 {PB_8, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_1)},
mbed_official 130:1dec54e4aec3 51 {NC, NC, 0}
mbed_official 130:1dec54e4aec3 52 };
mbed_official 130:1dec54e4aec3 53
mbed_official 227:7bd0639b8911 54 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 130:1dec54e4aec3 55 // Determine the I2C to use
mbed_official 130:1dec54e4aec3 56 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 130:1dec54e4aec3 57 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 130:1dec54e4aec3 58
mbed_official 130:1dec54e4aec3 59 obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 60 MBED_ASSERT(obj->i2c != (I2CName)NC);
mbed_official 130:1dec54e4aec3 61
mbed_official 130:1dec54e4aec3 62 // Enable I2C clock
mbed_official 227:7bd0639b8911 63 if (obj->i2c == I2C_1) {
mbed_official 130:1dec54e4aec3 64 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 130:1dec54e4aec3 65 }
mbed_official 130:1dec54e4aec3 66 //if (obj->i2c == I2C_2) {
mbed_official 130:1dec54e4aec3 67 // RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 130:1dec54e4aec3 68 //}
mbed_official 130:1dec54e4aec3 69
mbed_official 130:1dec54e4aec3 70 // Configure I2C pins
mbed_official 130:1dec54e4aec3 71 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 130:1dec54e4aec3 72 pin_mode(scl, OpenDrain);
mbed_official 130:1dec54e4aec3 73 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 130:1dec54e4aec3 74 pin_mode(sda, OpenDrain);
mbed_official 130:1dec54e4aec3 75
mbed_official 130:1dec54e4aec3 76 // Reset to clear pending flags if any
mbed_official 130:1dec54e4aec3 77 i2c_reset(obj);
mbed_official 130:1dec54e4aec3 78
mbed_official 130:1dec54e4aec3 79 // I2C configuration
mbed_official 227:7bd0639b8911 80 i2c_frequency(obj, 100000); // 100 kHz per default
mbed_official 130:1dec54e4aec3 81 }
mbed_official 130:1dec54e4aec3 82
mbed_official 130:1dec54e4aec3 83 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 227:7bd0639b8911 84 MBED_ASSERT((hz == 100000) || (hz == 200000) || (hz == 400000)); //"Only 100kHz, 200kHz and 400kHz I2C frequencies are supported."
mbed_official 130:1dec54e4aec3 85 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 130:1dec54e4aec3 86 I2C_InitTypeDef I2C_InitStructure;
mbed_official 142:7f2b6c44bbe3 87 uint32_t tim = 0;
mbed_official 130:1dec54e4aec3 88
mbed_official 130:1dec54e4aec3 89 // Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
mbed_official 130:1dec54e4aec3 90 // with Rise time = 100ns and Fall time = 10ns
mbed_official 130:1dec54e4aec3 91 switch (hz) {
mbed_official 130:1dec54e4aec3 92 case 100000:
mbed_official 130:1dec54e4aec3 93 tim = 0x00201D2B; // Standard mode
mbed_official 130:1dec54e4aec3 94 break;
mbed_official 130:1dec54e4aec3 95 case 200000:
mbed_official 130:1dec54e4aec3 96 tim = 0x0010021E; // Fast mode
mbed_official 130:1dec54e4aec3 97 break;
mbed_official 130:1dec54e4aec3 98 case 400000:
mbed_official 130:1dec54e4aec3 99 tim = 0x0010020A; // Fast mode
mbed_official 130:1dec54e4aec3 100 break;
mbed_official 130:1dec54e4aec3 101 default:
mbed_official 130:1dec54e4aec3 102 break;
mbed_official 130:1dec54e4aec3 103 }
mbed_official 130:1dec54e4aec3 104
mbed_official 130:1dec54e4aec3 105 // I2C configuration
mbed_official 130:1dec54e4aec3 106 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
mbed_official 130:1dec54e4aec3 107 I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
mbed_official 130:1dec54e4aec3 108 I2C_InitStructure.I2C_DigitalFilter = 0x00;
mbed_official 130:1dec54e4aec3 109 I2C_InitStructure.I2C_OwnAddress1 = 0x00;
mbed_official 130:1dec54e4aec3 110 I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
mbed_official 130:1dec54e4aec3 111 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
mbed_official 130:1dec54e4aec3 112 I2C_InitStructure.I2C_Timing = tim;
mbed_official 130:1dec54e4aec3 113 I2C_Init(i2c, &I2C_InitStructure);
mbed_official 130:1dec54e4aec3 114
mbed_official 130:1dec54e4aec3 115 I2C_Cmd(i2c, ENABLE);
mbed_official 130:1dec54e4aec3 116 }
mbed_official 130:1dec54e4aec3 117
mbed_official 130:1dec54e4aec3 118 inline int i2c_start(i2c_t *obj) {
mbed_official 130:1dec54e4aec3 119 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 130:1dec54e4aec3 120 int timeout;
mbed_official 130:1dec54e4aec3 121
mbed_official 130:1dec54e4aec3 122 // Test BUSY Flag
mbed_official 130:1dec54e4aec3 123 timeout = LONG_TIMEOUT;
mbed_official 130:1dec54e4aec3 124 while (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) != RESET) {
mbed_official 130:1dec54e4aec3 125 timeout--;
mbed_official 130:1dec54e4aec3 126 if (timeout == 0) {
mbed_official 130:1dec54e4aec3 127 return 0;
mbed_official 130:1dec54e4aec3 128 }
mbed_official 130:1dec54e4aec3 129 }
mbed_official 130:1dec54e4aec3 130
mbed_official 130:1dec54e4aec3 131 I2C_GenerateSTART(i2c, ENABLE);
mbed_official 130:1dec54e4aec3 132
mbed_official 130:1dec54e4aec3 133 return 0;
mbed_official 130:1dec54e4aec3 134 }
mbed_official 130:1dec54e4aec3 135
mbed_official 130:1dec54e4aec3 136 inline int i2c_stop(i2c_t *obj) {
mbed_official 130:1dec54e4aec3 137 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 130:1dec54e4aec3 138
mbed_official 130:1dec54e4aec3 139 I2C_GenerateSTOP(i2c, ENABLE);
mbed_official 130:1dec54e4aec3 140
mbed_official 130:1dec54e4aec3 141 return 0;
mbed_official 130:1dec54e4aec3 142 }
mbed_official 130:1dec54e4aec3 143
mbed_official 130:1dec54e4aec3 144 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 130:1dec54e4aec3 145 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 130:1dec54e4aec3 146 int count;
mbed_official 130:1dec54e4aec3 147 int value;
mbed_official 130:1dec54e4aec3 148
mbed_official 130:1dec54e4aec3 149 if (length == 0) return 0;
mbed_official 130:1dec54e4aec3 150
mbed_official 130:1dec54e4aec3 151 // Configure slave address, nbytes, reload, end mode and start or stop generation
mbed_official 130:1dec54e4aec3 152 I2C_TransferHandling(i2c, address, length, I2C_AutoEnd_Mode, I2C_Generate_Start_Read);
mbed_official 130:1dec54e4aec3 153
mbed_official 130:1dec54e4aec3 154 // Read all bytes
mbed_official 130:1dec54e4aec3 155 for (count = 0; count < length; count++) {
mbed_official 130:1dec54e4aec3 156 value = i2c_byte_read(obj, 0);
mbed_official 130:1dec54e4aec3 157 data[count] = (char)value;
mbed_official 130:1dec54e4aec3 158 }
mbed_official 130:1dec54e4aec3 159
mbed_official 130:1dec54e4aec3 160 return length;
mbed_official 130:1dec54e4aec3 161 }
mbed_official 130:1dec54e4aec3 162
mbed_official 130:1dec54e4aec3 163 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 130:1dec54e4aec3 164 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 130:1dec54e4aec3 165 //int timeout;
mbed_official 130:1dec54e4aec3 166 int count;
mbed_official 130:1dec54e4aec3 167
mbed_official 130:1dec54e4aec3 168 if (length == 0) return 0;
mbed_official 130:1dec54e4aec3 169
mbed_official 130:1dec54e4aec3 170 // TODO: the stop is always sent even with I2C_SoftEnd_Mode. To be corrected.
mbed_official 130:1dec54e4aec3 171
mbed_official 130:1dec54e4aec3 172 // Configure slave address, nbytes, reload, end mode and start or stop generation
mbed_official 130:1dec54e4aec3 173 //if (stop) {
mbed_official 130:1dec54e4aec3 174 I2C_TransferHandling(i2c, address, length, I2C_AutoEnd_Mode, I2C_Generate_Start_Write);
mbed_official 130:1dec54e4aec3 175 //}
mbed_official 130:1dec54e4aec3 176 //else {
mbed_official 130:1dec54e4aec3 177 // I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
mbed_official 130:1dec54e4aec3 178 //}
mbed_official 130:1dec54e4aec3 179
mbed_official 130:1dec54e4aec3 180 // Write all bytes
mbed_official 130:1dec54e4aec3 181 for (count = 0; count < length; count++) {
mbed_official 130:1dec54e4aec3 182 if (i2c_byte_write(obj, data[count]) != 1) {
mbed_official 130:1dec54e4aec3 183 i2c_stop(obj);
mbed_official 130:1dec54e4aec3 184 return 0;
mbed_official 130:1dec54e4aec3 185 }
mbed_official 130:1dec54e4aec3 186 }
mbed_official 130:1dec54e4aec3 187
mbed_official 130:1dec54e4aec3 188 /*
mbed_official 130:1dec54e4aec3 189 if (stop) {
mbed_official 130:1dec54e4aec3 190 // Wait until STOPF flag is set
mbed_official 130:1dec54e4aec3 191 timeout = LONG_TIMEOUT;
mbed_official 130:1dec54e4aec3 192 while (I2C_GetFlagStatus(i2c, I2C_ISR_STOPF) == RESET) {
mbed_official 130:1dec54e4aec3 193 timeout--;
mbed_official 130:1dec54e4aec3 194 if (timeout == 0) {
mbed_official 130:1dec54e4aec3 195 return 0;
mbed_official 130:1dec54e4aec3 196 }
mbed_official 130:1dec54e4aec3 197 }
mbed_official 130:1dec54e4aec3 198 // Clear STOPF flag
mbed_official 130:1dec54e4aec3 199 I2C_ClearFlag(i2c, I2C_ICR_STOPCF);
mbed_official 130:1dec54e4aec3 200 }
mbed_official 130:1dec54e4aec3 201 */
mbed_official 130:1dec54e4aec3 202
mbed_official 130:1dec54e4aec3 203 return count;
mbed_official 130:1dec54e4aec3 204 }
mbed_official 130:1dec54e4aec3 205
mbed_official 130:1dec54e4aec3 206 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 130:1dec54e4aec3 207 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 130:1dec54e4aec3 208 uint8_t data;
mbed_official 130:1dec54e4aec3 209 int timeout;
mbed_official 130:1dec54e4aec3 210
mbed_official 130:1dec54e4aec3 211 // Wait until the byte is received
mbed_official 227:7bd0639b8911 212 timeout = FLAG_TIMEOUT;
mbed_official 130:1dec54e4aec3 213 while (I2C_GetFlagStatus(i2c, I2C_ISR_RXNE) == RESET) {
mbed_official 130:1dec54e4aec3 214 timeout--;
mbed_official 130:1dec54e4aec3 215 if (timeout == 0) {
mbed_official 130:1dec54e4aec3 216 return 0;
mbed_official 130:1dec54e4aec3 217 }
mbed_official 130:1dec54e4aec3 218 }
mbed_official 130:1dec54e4aec3 219
mbed_official 130:1dec54e4aec3 220 data = I2C_ReceiveData(i2c);
mbed_official 130:1dec54e4aec3 221
mbed_official 130:1dec54e4aec3 222 return (int)data;
mbed_official 130:1dec54e4aec3 223 }
mbed_official 130:1dec54e4aec3 224
mbed_official 130:1dec54e4aec3 225 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 130:1dec54e4aec3 226 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 130:1dec54e4aec3 227 int timeout;
mbed_official 130:1dec54e4aec3 228
mbed_official 130:1dec54e4aec3 229 // Wait until the previous byte is transmitted
mbed_official 130:1dec54e4aec3 230 timeout = FLAG_TIMEOUT;
mbed_official 130:1dec54e4aec3 231 while (I2C_GetFlagStatus(i2c, I2C_ISR_TXIS) == RESET) {
mbed_official 130:1dec54e4aec3 232 timeout--;
mbed_official 130:1dec54e4aec3 233 if (timeout == 0) {
mbed_official 130:1dec54e4aec3 234 return 0;
mbed_official 130:1dec54e4aec3 235 }
mbed_official 130:1dec54e4aec3 236 }
mbed_official 130:1dec54e4aec3 237
mbed_official 130:1dec54e4aec3 238 I2C_SendData(i2c, (uint8_t)data);
mbed_official 130:1dec54e4aec3 239
mbed_official 130:1dec54e4aec3 240 return 1;
mbed_official 130:1dec54e4aec3 241 }
mbed_official 130:1dec54e4aec3 242
mbed_official 130:1dec54e4aec3 243 void i2c_reset(i2c_t *obj) {
mbed_official 227:7bd0639b8911 244 if (obj->i2c == I2C_1) {
mbed_official 130:1dec54e4aec3 245 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
mbed_official 130:1dec54e4aec3 246 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
mbed_official 130:1dec54e4aec3 247 }
mbed_official 130:1dec54e4aec3 248 //if (obj->i2c == I2C_2) {
mbed_official 130:1dec54e4aec3 249 // RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
mbed_official 227:7bd0639b8911 250 // RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
mbed_official 130:1dec54e4aec3 251 //}
mbed_official 130:1dec54e4aec3 252 }
mbed_official 130:1dec54e4aec3 253
mbed_official 130:1dec54e4aec3 254 #if DEVICE_I2CSLAVE
mbed_official 130:1dec54e4aec3 255
mbed_official 130:1dec54e4aec3 256 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 130:1dec54e4aec3 257 I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
mbed_official 130:1dec54e4aec3 258 uint16_t tmpreg;
mbed_official 130:1dec54e4aec3 259
mbed_official 130:1dec54e4aec3 260 // Get the old register value
mbed_official 130:1dec54e4aec3 261 tmpreg = i2c->OAR1;
mbed_official 130:1dec54e4aec3 262 // Reset address bits
mbed_official 130:1dec54e4aec3 263 tmpreg &= 0xFC00;
mbed_official 130:1dec54e4aec3 264 // Set new address
mbed_official 130:1dec54e4aec3 265 tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
mbed_official 130:1dec54e4aec3 266 // Store the new register value
mbed_official 130:1dec54e4aec3 267 i2c->OAR1 = tmpreg;
mbed_official 130:1dec54e4aec3 268 }
mbed_official 130:1dec54e4aec3 269
mbed_official 130:1dec54e4aec3 270 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 130:1dec54e4aec3 271 // Nothing to do
mbed_official 130:1dec54e4aec3 272 }
mbed_official 130:1dec54e4aec3 273
mbed_official 130:1dec54e4aec3 274 // See I2CSlave.h
mbed_official 130:1dec54e4aec3 275 #define NoData 0 // the slave has not been addressed
mbed_official 130:1dec54e4aec3 276 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
mbed_official 130:1dec54e4aec3 277 #define WriteGeneral 2 // the master is writing to all slave
mbed_official 130:1dec54e4aec3 278 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
mbed_official 130:1dec54e4aec3 279
mbed_official 130:1dec54e4aec3 280 int i2c_slave_receive(i2c_t *obj) {
mbed_official 130:1dec54e4aec3 281 // TO BE DONE
mbed_official 130:1dec54e4aec3 282 return(0);
mbed_official 130:1dec54e4aec3 283 }
mbed_official 130:1dec54e4aec3 284
mbed_official 130:1dec54e4aec3 285 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 130:1dec54e4aec3 286 int count = 0;
mbed_official 130:1dec54e4aec3 287
mbed_official 130:1dec54e4aec3 288 // Read all bytes
mbed_official 130:1dec54e4aec3 289 for (count = 0; count < length; count++) {
mbed_official 130:1dec54e4aec3 290 data[count] = i2c_byte_read(obj, 0);
mbed_official 130:1dec54e4aec3 291 }
mbed_official 130:1dec54e4aec3 292
mbed_official 130:1dec54e4aec3 293 return count;
mbed_official 130:1dec54e4aec3 294 }
mbed_official 130:1dec54e4aec3 295
mbed_official 130:1dec54e4aec3 296 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 130:1dec54e4aec3 297 int count = 0;
mbed_official 130:1dec54e4aec3 298
mbed_official 130:1dec54e4aec3 299 // Write all bytes
mbed_official 130:1dec54e4aec3 300 for (count = 0; count < length; count++) {
mbed_official 130:1dec54e4aec3 301 i2c_byte_write(obj, data[count]);
mbed_official 130:1dec54e4aec3 302 }
mbed_official 130:1dec54e4aec3 303
mbed_official 130:1dec54e4aec3 304 return count;
mbed_official 130:1dec54e4aec3 305 }
mbed_official 130:1dec54e4aec3 306
mbed_official 130:1dec54e4aec3 307
mbed_official 130:1dec54e4aec3 308 #endif // DEVICE_I2CSLAVE
mbed_official 130:1dec54e4aec3 309
mbed_official 130:1dec54e4aec3 310 #endif // DEVICE_I2C