Fun withRaspberry PI

GPIO

GPIOGeneral-purpose input/output

1/0

saveamsterdam.com

Linux

Perl 5.20+

libbcm2835

Device::BCM2835::gpio_write($gpio, 1);

Device::BCM2835::gpio_write($gpio, 0);

Device::BCM2835::gpio_set($gpio);

Device::BCM2835::gpio_clr($gpio);

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

5V vs 3.3V

5V vs 3.3V

Dimmer

Blinks!

Is Perl slow?

Trying C

100x faster

Blinks!

???

!!!

Interrupts!

printf("Disabling interrupts\n");

disable_interrupts();

pidelay(3000000);

printf("Enabling interrupts\n");

enable_interrupts();

printf("Disabling interrupts\n");

disable_interrupts();

pidelay(3000000);

printf("Enabling interrupts\n");

enable_interrupts();

printf("Disabling interrupts\n");

disable_interrupts();

pidelay(3000000);

printf("Enabling interrupts\n");

enable_interrupts();

Works!

But no network

LED

Cheap,use many

Linux + Perl,easy to use!

use Perl or die;