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58 lines
1006 B
58 lines
1006 B
/*
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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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*/
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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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