Can't Read Data from Custom componet (Avalon mm)

Ok, there is a simpler code:

 
module simpler (
    data_o,
    address_i,
    clk,
    read_i
    );
output reg  data_o;
input address_i;
input clk;
input read_i;
always @ (posedge clk)
begin
    data_o = 32'hF0F0F0F0;
end
endmodule

#include "basic_io.h"# include "Test.h"# include "LCD.h"# include "DM9000A.C"
int main(void)
{
  unsigned int res, i;  
    
  for(i=0; i < 255; i++)
  {  
    res = IORD(SIMPLER_0_BASE, 0x00);    
    printf("\nIteracion %d, res =%d", i, res);
    msleep(500);   
  }
  return 0;
}