Dear everyone,
I am now working on a multicore system.
cpu_0 runs uclinux,
cpu_1 runs a piece of program,
the base address of led_red( pio ) in the SOPCBuilder is 0x00400000,
the base address of led_red in nios2_system.h in uclinux is 0x80400000.
I have succeed in writing a value onto the led_red through program in uclinux,
however, when I tried to read the written value through a program( cpu_1 )
without a system,
it always appears the same value "-1".
Here's the small program in cpu_0(uclinux).
#define LEDR_BASE 0x80400000
int main(){
int *led_red = (int *) LEDR_BASE;
*(led_red) = 128;
return 0;
}
after running it in the uclinux, the 8th led_red lights on.
Here's the small program in cpu_1.
#include <stdio.h>
#define LEDR_BASE 0x00400000
int main()
{
printf("Hello from Nios II!\n");
int *red_red = (int *)LEDR_BASE;
printf("%d",*red_red);
return 0;
}
after running it the console always shows the value of -1
I don't know why,could somebody help me?
Thanks.
Yours sincerely,
babysnow_______________________________________________
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