Re: Switch on leds on DE2

Altera_Forum · ‎10-21-2009

Hey, im trying to switch on LEds on DE2.

http://thalandinenop99.free.fr/image.jpg

You can see here the system that i've generated.

Leds is set in output with 8 bits and Switch set in input with 8 bits

I've generated the system then i've programmed it to my DE2, then i've written this code in C with NIOS 2 IDE in oder to switch on the LED :

# define SWITCHES_BASE_ADDRESS 0x00009010# define LEDR_BASE_ADDRESS 0x00009000

int main(void)

{

int * red_leds = (int *) LEDR_BASE_ADDRESS; /* red_leds is a pointer to the LEDRs */

volatile int * Switch = (int *) SWITCHES_BASE_ADDRESS; /* switches point to toggle switches */

printf("Hello from Nios II!\n");

while(1)

{

*(red_leds) = *(Switch); /* Red LEDR[k] is set equal to SW[k] */

}

return 0;

}

i've send this to DE2. i don't understand why, LED's doesn't want to switch on....any idea ?? is there any turorial of how i have to code in C if yes, where can i download this file...could you plus help me to solve this problem.

Thanks

Altera_Forum · ‎10-22-2009

If you have used Nios II full version, addresses below to 0x8000000 are cacheable, so you will experience problems accesing hardware in the way you're doing. I strongly suggest use the IORD and IOWR macros, they use I/O instructions. So according to your SOPC system


# include "system.h"
# include "io.h"
...
while(1)
{
IOWR(LEDS_BASE,0,IORD(SWITCH_BASE,0));
}
......

base address definitions are made on "system.h".

Altera_Forum · ‎10-22-2009

thanks it works fine