Onchip FIFO Memory Core [Avalon-MM Write Slave to Avalon-MM Read Slave]: Help In NIOS Programming Code

Hello,

I want to write 32-bit data into FIFO and read the data from FIFO.

So, I have followed this FIFO configuration :Aalon-MM write slave to Avalon-MM read slave.

Questions to be clarified:

1. I have enabled "backpressure" how to set in wait request signal in NIOS (0`s (deserted) or 1`s (asserted)).

2. i want example code to read the data from FIFO. I have tried but its throwing error. "FIFO_0_IN_BASE" is undeclared.

in which file i can find Base address and control address for read operation.

Please anyone guide me.

#include "sys/alt_stdio.h"
#include "alt_types.h"
#include<io.h>
#include<system.h>
#include<stdio.h>
#include "altera_avalon_pio_regs.h"
#include "altera_avalon_fifo.h"
#include "altera_avalon_fifo_util.h"
#include "altera_avalon_fifo_regs.h"
 
#define FIFO_0_IN_BASE 0x3000
#define ctrl_address 0x3040
 
 
int main()
{
 
    	int result,i=0;
        int *data=0;
 
    	IOWR(ENABLE_BASE, 0, 0x1);		// Enable the counter
    	alt_printf("Hello from Nios II!\n");		// Send Hello World to the JTAG UART
 
    	while(1)
    	{
    	*data = IORD_ALTERA_AVALON_FIFO_DATA(FIFO_0_IN_BASE);
    	printf("%d\n",*data);
    	}
    
    	return 0;
}