button.c 1.8 KB

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  1. /*
  2. * button.c:
  3. * Simple button test for the Quick2Wire interface board.
  4. *
  5. * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
  6. ***********************************************************************
  7. * This file is part of wiringPi:
  8. * https://projects.drogon.net/raspberry-pi/wiringpi/
  9. *
  10. * wiringPi is free software: you can redistribute it and/or modify
  11. * it under the terms of the GNU Lesser General Public License as published by
  12. * the Free Software Foundation, either version 3 of the License, or
  13. * (at your option) any later version.
  14. *
  15. * wiringPi is distributed in the hope that it will be useful,
  16. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18. * GNU Lesser General Public License for more details.
  19. *
  20. * You should have received a copy of the GNU Lesser General Public License
  21. * along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
  22. ***********************************************************************
  23. */
  24. #include <stdio.h>
  25. #include <wiringPi.h>
  26. #define BUTTON 0
  27. #define LED1 1
  28. #define LED2 7
  29. int main (void)
  30. {
  31. // Enable the on-goard GPIO
  32. wiringPiSetup () ;
  33. printf ("Raspberry Pi - Quick2Wire Mainboard Button & LED Test\n") ;
  34. pinMode (BUTTON, INPUT) ;
  35. pinMode (LED1, OUTPUT) ;
  36. pinMode (LED2, OUTPUT) ;
  37. digitalWrite (LED1, HIGH) ; // On-board LED on
  38. digitalWrite (LED2, LOW) ; // 2nd LED off
  39. for (;;)
  40. {
  41. if (digitalRead (BUTTON) == HIGH) // Swap LED states
  42. {
  43. digitalWrite (LED1, LOW) ;
  44. digitalWrite (LED2, HIGH) ;
  45. while (digitalRead (BUTTON) == HIGH)
  46. delay (1) ;
  47. digitalWrite (LED1, HIGH) ;
  48. digitalWrite (LED2, LOW) ;
  49. }
  50. delay (1) ;
  51. }
  52. return 0 ;
  53. }