buttons and leds

I'm not using the drivers for these devices, so I leave them out of the kernel compile. I could never get the button device /dev/btn to work.

What I do instead is just directly read and write the ports. So I have

# include "nios2_system.h"

VUINT16 *button_address = (VUINT16*) na_button_pio;

VUINT16 *led_7seg_address = (VUINT16*) na_seven_seg_pio;

VUINT8 *led_address = (VUINT8*) na_led_pio;

and then just read and write to these ports.

For the buttons:

int get_button_press(void) {

int button_value = ~*button_address;

if (button_value & 0x08)

return 1;

else if (button_value & 0x04)

return 2;

else if (button_value & 0x02)

return 3;

else if (button_value & 0x01)

return 4;

else

return 0;

}

For the leds just read and write values. I can share my digit code and alphabetic characters for the seven segment display if you want.

Cheers,

Josh