/*
 * main.c for the MIPSfpga core running on Nexys4 DDR board.
 *
 * This program:
 *   (1) reads the switches on the Nexys4 DDR board and 
 *   (2) flashes the value of the switches on the LEDs
 */

 //#include <windows.h>

void delay();

//------------------
// main()
//------------------
int main() {
  volatile int *IO_SWITCHES = (int*)0xbf800008;
  volatile int *IO_LEDR = (int*)0xbf800000;
  volatile int *IO_PUSHBUTTON = (int*)0xbf80000c;
  volatile int *IO_SEGEN_N = (int*)0xbf800010;
  volatile int *IO_SEG0_N = (int*)0xbf800014;
  volatile int *IO_SEG1_N = (int*)0xbf800018;
  volatile int *IO_SEG2_N = (int*)0xbf80001c;
  volatile int *IO_SEG3_N = (int*)0xbf800020;
  volatile int *IO_SEG4_N = (int*)0xbf800024;
  volatile int *IO_SEG5_N = (int*)0xbf800028;
  volatile int *IO_SEG6_N = (int*)0xbf80002c;
  volatile int *IO_SEG7_N = (int*)0xbf800030;
  volatile unsigned int switches, pushbutton; // 2 byte -> 16bits
  int cont = 0;
  int pulsaciones = 0;

  *IO_SEGEN_N = 0B111111110;
  delay();

  while (1) {
	switches = *IO_SWITCHES;
	delay();
	*IO_LEDR = 0x00;
	delay();
  	// Si el switch 0 se pone a 1, cada dígito se mostrará solo durante ¼ segundo
  	if((switches & 0B0000000000000001) == 0B0000000000000001){
  		cont = 0;
		while(cont<=15){
	  		*IO_SEG0_N = cont;
	  		delay();
	  		cont++;
	  	}
  	}
  	switches = *IO_SWITCHES;
	delay();
  	// Si el switch 1 se pone a 1, los dígitos se mostrarán en orden decreciente.
	else if(((switches & 0B0000000000000010) >> 1)  == 0B0000000000000001){
	  	cont = 15;
  		while(cont>=0){
	  		*IO_SEG0_N = cont;
	  		delay();
	  		delay();
	  		delay();
	  		delay();
	  		cont--;
	  	}
  	}

	pushbutton = *IO_PUSHBUTTON;
  	switches = *IO_SWITCHES;
  	delay();
  	else if((pushbutton & 0B0000000000000001)==1){ //-----------------------------------
  		pulsaciones++;
  		*IO_SEGEN_N = (0B11111110 << pulsaciones);
  		delay();
  		if(*IO_SEGEN_N & 0B0000000000000010 == 0){ //-----------------------------------
  			*IO_SEG1_N = *IO_SEG0_N;
  			delay();
  		}
  		else if(*IO_SEGEN_N & 0B0000000000000100 == 4){
  			*IO_SEG2_N = *IO_SEG1_N;
  			delay();
  			*IO_SEG1_N = *IO_SEG0_N;
  			delay();
  		}
  		else if(*IO_SEGEN_N & 0B0000000000001000 == 8){
  			*IO_SEG3_N = *IO_SEG2_N;
  			delay();
  			*IO_SEG2_N = *IO_SEG1_N;
  			delay();
  			*IO_SEG1_N = *IO_SEG0_N;
  		}
  	}
  	switches = *IO_SWITCHES;
  	delay();
  	else{
  		cont = 0;
	  	while(cont<=15){
	  		*IO_SEG0_N = cont;
	  		delay();
	  		delay();
	  		delay();
	  		delay();
	  		//Sleep(2000);
	  		cont++;
	  	}		
  	}
  }
  return 0;
}

void delay() {
  volatile unsigned int j;

  for (j = 0; j < (1000000); j++) ;	// delay 
}

void incremento(){
	
}