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Altera_Forum
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19 years ago

buttons and leds

Hello all and hippo, Can anyone out there help me with buttons and leds ? I am running uclinux on cyclone ii 2c35 nios ii dev board. I have 8 leds, 2 7-segment leds, 4 buttons and 16x...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

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originally posted by jmarshall@Aug 16 2006, 02:01 PM

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

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hi all, i would like to c the code oso. thx for sharing! http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/smile.gif