/* * reaction.c: * Simple test for the PiFace interface board. * * Copyright (c) 2012-2013 Gordon Henderson. *********************************************************************** * This file is part of wiringPi: * https://projects.drogon.net/raspberry-pi/wiringpi/ * * wiringPi is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * wiringPi is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with wiringPi. If not, see . *********************************************************************** */ #include #include #include #include #include int outputs [4] = { 0,0,0,0 } ; #define PIFACE 200 /* * light: * Light up the given LED - actually lights up a pair ********************************************************************************* */ void light (int led, int value) { led *= 2 ; digitalWrite (PIFACE + led + 0, value) ; digitalWrite (PIFACE + led + 1, value) ; } /* * lightAll: * All On or Off ********************************************************************************* */ void lightAll (int onoff) { light (0, onoff) ; light (1, onoff) ; light (2, onoff) ; light (3, onoff) ; } /* * waitForNoButtons: * Wait for all buttons to be released ********************************************************************************* */ void waitForNoButtons (void) { int i, button ; for (;;) { button = 0 ; for (i = 0 ; i < 4 ; ++i) button += digitalRead (PIFACE + i) ; if (button == 4) break ; } } void scanButton (int button) { if (digitalRead (PIFACE + button) == LOW) { outputs [button] ^= 1 ; digitalWrite (PIFACE + button, outputs [button]) ; } while (digitalRead (PIFACE + button) == LOW) delay (1) ; } int main (void) { int i, j ; int led, button ; unsigned int start, stop ; printf ("Raspberry Pi PiFace Reaction Timer\n") ; printf ("==================================\n") ; if (piFaceSetup (PIFACE) == -1) exit (1) ; // Enable internal pull-ups for (i = 0 ; i < 8 ; ++i) pullUpDnControl (PIFACE + i, PUD_UP) ; // Main game loop: // Put some random LED pairs up for a few seconds, then blank ... for (;;) { printf ("Press any button to start ... \n") ; fflush (stdout) ; for (;;) { led = rand () % 4 ; light (led, 1) ; delay (10) ; light (led, 0) ; button = 0 ; for (j = 0 ; j < 4 ; ++j) button += digitalRead (PIFACE + j) ; if (button != 4) break ; } waitForNoButtons () ; printf ("Wait for it ... ") ; fflush (stdout) ; led = rand () % 4 ; delay (rand () % 500 + 1000) ; light (led, 1) ; start = millis () ; for (button = -1 ; button == -1 ; ) { for (j = 0 ; j < 4 ; ++j) if (digitalRead (PIFACE + j) == 0) // Pushed { button = j ; break ; } } stop = millis () ; button = 3 - button ; // Correct for the buttons/LEDs reversed light (led, 0) ; waitForNoButtons () ; light (led, 1) ; if (button == led) { printf ("You got it in %3d mS\n", stop - start) ; } else { printf ("Missed: You pushed %d - LED was %d\n", button, led) ; for (;;) { light (button, 1) ; delay (100) ; light (button, 0) ; delay (100) ; i = 0 ; for (j = 0 ; j < 4 ; ++j) i += digitalRead (PIFACE + j) ; if (i != 4) break ; } waitForNoButtons () ; } light (led, 0) ; delay (4000) ; } return 0 ; }