Problem in running NIOS II Software Project on Altera

Hey Guys .

Have been doing some of RS232 uart work .

I've successfully written data to computer via RS232 uart but having some problems reading data through serial isr.

I've configured the# defined the uart base address and uart irq that was shown in sopc builder and used some of code posted by some person .

Here's the code :

# include <stdio.h># include <unistd.h># include <sys/alt_irq.h># include "sys/alt_stdio.h"# include "system.h"# include "alt_types.h"# include "altera_avalon_uart_regs.h"

# define Switches (volatile char *) 0x00011040# define LEDs (char *) 0x00011050# define UART0_BASE (char *) 0x00011000# define UART0_IRQ 1# define TIMER0_BASE (char *) 0x00011020

void uart0_put_char(unsigned char ch)

{

while((IORD_ALTERA_AVALON_UART_STATUS(UART0_BASE) & 0x040) != 0x040){ ;}

IOWR_ALTERA_AVALON_UART_TXDATA(UART0_BASE,ch);

}

void uart0_put_str(unsigned char * str){

while(*str){

uart0_put_char(*str);

str++;

}

}

void uart_handle(void *context,alt_u32 interrupt)

{

unsigned short int data,status;

//status = IORD_ALTERA_AVALON_UART_STATUS(UART_0_BASE);

//while (!(status & ALTERA_AVALON_UART_STATUS_RRDY_MSK))

status = IORD_ALTERA_AVALON_UART_STATUS(UART0_BASE);

data =IORD_ALTERA_AVALON_UART_RXDATA(UART0_BASE);

/*

//write status reg;

status = ALTERA_AVALON_UART_STATUS_TRDY_MSK;

IOWR_ALTERA_AVALON_UART_STATUS(UART0_BASE, status);

IOWR_ALTERA_AVALON_UART_TXDATA(UART0_BASE, data);

IOWR_ALTERA_AVALON_UART_STATUS(UART0_BASE, 0);

*/

}

void uart_init()

{

alt_u32 control;

volatile unsigned long uart_capture;

// int divisor;

alt_putstr("Debug 1\n");

control = ALTERA_AVALON_UART_CONTROL_TRDY_MSK | ALTERA_AVALON_UART_CONTROL_RRDY_MSK | ALTERA_AVALON_UART_CONTROL_E_MSK;

IOWR_ALTERA_AVALON_UART_CONTROL(UART0_BASE, control);

alt_putstr("Debug 2\n");

// divisor = (int)(50000000/9600+0.5);

// IOWR_ALTERA_AVALON_UART_DIVISOR(UART0_BASE, divisor);

alt_putstr("Debug 3\n");

if (alt_irq_register(UART0_IRQ, (void*)uart_capture, uart_handle)){

alt_putstr("Debug 4\n");

}else{

alt_putstr("Debug 5\n");

}

}

int main(){

printf("Hello from NIOS II \n");

uart_init();

//usleep(1000000);

printf("Hello from NIOS III \n");

uart0_put_str("Hello World");

while(1){

*LEDs = *Switches;

}

return 0;

}

i only get output upto :

Hello from NIOS II

Debug 1

Debug 2

Debug 3

There seems to be problem while registering for irq in statement:

alt_irq_register(UART0_IRQ, (void*)uart_capture, uart_handle)

Can anyone plz tell me what's the actual way to do it ? And why my code is hanging on this statement.