IRQ on PCI Development Kit, Cyclone II Edition

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Hello i've used IRQ without any problems in the DE2 but it isn't working in this kit (PCI Cyclone II) 

 My IRQ code is the following..   int main() { // Enable all 4 button interrupts. IOWR_ALTERA_AVALON_PIO_IRQ_MASK(PIO_0_BASE, 0xf); // Reset the edge capture register. IOWR_ALTERA_AVALON_PIO_EDGE_CAP(PIO_0_BASE, 0x0); // Register the interrupt handler. alt_irq_register( PIO_0_IRQ,&edge_capture, handle_button_interrupts ); alt_irq_enable_all; alt_printf("loop start\n"); while(1) { usleep(100000); alt_printf("%x",IORD_ALTERA_AVALON_PIO_DATA(PIO_0_BASE)); //if(led==1) // { // led = 2; // initdma(); // printf("content of fifo:before DMA operation\n"); // for ( i=0;i<32;i++) // { // printf("%d: %x\n",i,IORD(FIFOWRAPPER_0_BASE,0)); // } // } // if (led==2){ // alt_printf("FIM"); // while (1){} // initdma();} // } } //alt_printf("%i:",led); //} return 0; } static void handle_button_interrupts(void* context, alt_u32 id) { // Cast context to edge_capture&#39;s type. It is important that this be // declared volatile to avoid unwanted compiler optimization. // volatile int* edge_capture_ptr = (volatile int*) context; // Store the value in the Button&#39;s edge capture register in *context. *edge_capture_ptr = IORD_ALTERA_AVALON_PIO_EDGE_CAP(PIO_0_BASE); // Reset the Button&#39;s edge capture register. IOWR_ALTERA_AVALON_PIO_EDGE_CAP(PIO_0_BASE, 0); led=1; //initdma(); // irq_count++; }    I am basically counting up to 50 seconds and it should generate an IRQ.. My valid is connected to a input PIO in the sopc.  //always@(posedge clk_1 or negedge resete) //begin //if(~resete) // begin // contador <= 0; // soma <= 0; // valid <= 0; // end //else //begin //valid <= 1; ////contador <= contador +1; ////valid <= 0; //// if(contador==100000000) //// begin //// contador<=0; //// soma <= soma+1; //// end //// if (soma==50) //// begin //// valid<=1; //// end //end   That's very weird.. the exactly same verilog/ C code works for my DE2 project, why should it be different for the PCI kit?