Setup an IRQ on a component

Hello ,

I map the signals as following :

module counter_avalon_interface

(

clk , // global signal , clk , 1bit , input

reset_n , // global signal , reset , 1bit , input

chipselect , // avalon_slave 0 , chipselect , 1bit , input

address , // avalon_slave_0 , address , 2bit , input

write , // avalon_slave_0 , write , 1bit , input

writedata , // avalon_slave_0 , writedata , 8bit , input

read , // avalon_slave_0 , read , 1bit , input

readdata , // avalon_slave_0 , writedata , 8bit , output

counter_out, // avalon_slave_0 , writedata , 8bit , export

intr // avalon_slave_0 , irq , 1bit

);

and use this code in NIOS IDE to "process" the interrupt :

# include <stdio.h># include <sys/alt_irq.h># include <io.h>

# include "counter_routines.h"# include "system.h"# include "altera_avalon_uart_regs.h"

void counter_isr( int context );

int main()

{

int context = 0;

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

SetInterrupt( COUNTER_0_BASE ); // enable IRDY , my own HAL driver

alt_irq_register( COUNTER_0_IRQ , &context , counter_isr );

while( 1 )

{

}

return 0;

}

void counter_isr( int context )

{

// output &#39;Y&#39; to UART

IOWR_ALTERA_AVALON_UART_TXDATA( UART1_BASE , &#39;Y&#39; );

}

-------

It seemed that CPU wasn&#39;t interrupted.

Anybody has got this issue before ?

Thanks,

Quan