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62 lines
1.8 KiB
62 lines
1.8 KiB
/*
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*i2ctest.c
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* Raspberry Pi I2C test using wiringPi library.
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*
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*Copyright (c) Nahid Alam. <nahid.mahfuza.alam@gmail.com>
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***********************************************************
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*i2ctest is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* i2ctest is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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***********************************************************
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*/
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#include <stdio.h>
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#include <wiringPi.h>
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#include <wiringPiI2C.h>
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int main (int argc, char *argv[])
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{
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int fd;
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int data;
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int send=1;
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wiringPiSetup () ;
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fd=wiringPiI2CSetup (0x20) ; /*Use i2cdetect command to find your respective device address*/
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if(fd==-1)
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{
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printf("Can't setup the I2C device\n");
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return -1;
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}
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else
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{
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delay(1);
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while(1) {
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wiringPiI2CWrite(fd, send);
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data=wiringPiI2CRead(fd);
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printf(" Received data=%d\n", data);
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if(data==-1)
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{
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printf("No data\n");
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//return -1;
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}
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else if(data == 17) {
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printf("Exit code received \n");
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break;
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}
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else if(data != 0) {
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printf("Sending response %d\n", data+3 );
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wiringPiI2CWrite(fd, data+3);
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}
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}
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}
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return 0;
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}
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