Short stories about playing with Raspberry Pi for couple of years

1. Fun with
Raspberry PI

5. GPIO

6. GPIO
General-purpose input/output

7. 1/0

8. saveamsterdam.com

9. Linux

10. Perl 5.20+

11. libbcm2835

13. Device::BCM2835::gpio_write($gpio, 1);
Device::BCM2835::gpio_write($gpio, 0);

14. Device::BCM2835::gpio_set($gpio);
Device::BCM2835::gpio_clr($gpio);

15. say Device::BCM2835::gpio_lev($gpio);

16. 5V vs 3.3V

17. 5V vs 3.3V

18. Dimmer

22. Blinks!

23. Is Perl slow?

24. Trying C

25. 100x faster

26. Blinks!

27. ???

30. !!!

31. Interrupts!

35. printf("Disabling interruptsn");
disable_interrupts();
pidelay(3000000);
printf("Enabling interruptsn");
enable_interrupts();

36. printf("Disabling interruptsn");
disable_interrupts();
pidelay(3000000);
printf("Enabling interruptsn");
enable_interrupts();

37. printf("Disabling interruptsn");
disable_interrupts();
pidelay(3000000);
printf("Enabling interruptsn");
enable_interrupts();

38. Works!

41. But no network

44. LED

50. Cheap,
use many

53. Linux + Perl,
easy to use!

56. use Perl or die;