3 * Very simple program to test the serial port. Expects
4 * the port to be looped back to itself
6 * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
7 ***********************************************************************
8 * This file is part of wiringPi:
9 * https://projects.drogon.net/raspberry-pi/wiringpi/
11 * wiringPi is free software: you can redistribute it and/or modify
12 * it under the terms of the GNU Lesser General Public License as published by
13 * the Free Software Foundation, either version 3 of the License, or
14 * (at your option) any later version.
16 * wiringPi is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU Lesser General Public License for more details.
21 * You should have received a copy of the GNU Lesser General Public License
22 * along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
23 ***********************************************************************
31 #include <wiringSerial.h>
37 unsigned int nextTime ;
39 if ((fd = serialOpen ("/dev/ttyAMA0", 115200)) < 0)
41 fprintf (stderr, "Unable to open serial device: %s\n", strerror (errno)) ;
45 if (wiringPiSetup () == -1)
47 fprintf (stdout, "Unable to start wiringPi: %s\n", strerror (errno)) ;
51 nextTime = millis () + 300 ;
53 for (count = 0 ; count < 256 ; )
55 if (millis () > nextTime)
57 printf ("\nOut: %3d: ", count) ;
59 serialPutchar (fd, count) ;
66 while (serialDataAvail (fd))
68 printf (" -> %3d", serialGetchar (fd)) ;