76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/*
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* serialTest.c:
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* Very simple program to test the serial port. Expects
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* the port to be looped back to itself
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*
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* Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
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***********************************************************************
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* This file is part of wiringPi:
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* https://projects.drogon.net/raspberry-pi/wiringpi/
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*
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* wiringPi 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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* wiringPi 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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* You should have received a copy of the GNU Lesser General Public License
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* along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
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***********************************************************************
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*/
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <wiringPi.h>
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#include <wiringSerial.h>
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int main ()
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{
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int fd ;
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int count ;
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unsigned int nextTime ;
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if ((fd = serialOpen ("/dev/ttyAMA0", 115200)) < 0)
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{
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fprintf (stderr, "Unable to open serial device: %s\n", strerror (errno)) ;
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return 1 ;
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}
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if (wiringPiSetup () == -1)
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{
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fprintf (stdout, "Unable to start wiringPi: %s\n", strerror (errno)) ;
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return 1 ;
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}
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nextTime = millis () + 300 ;
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for (count = 0 ; count < 256 ; )
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{
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if (millis () > nextTime)
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{
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printf ("\nOut: %3d: ", count) ;
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fflush (stdout) ;
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serialPutchar (fd, count) ;
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nextTime += 300 ;
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++count ;
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}
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delay (3) ;
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while (serialDataAvail (fd))
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{
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printf (" -> %3d", serialGetchar (fd)) ;
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fflush (stdout) ;
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}
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}
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printf ("\n") ;
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return 0 ;
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}
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