/**
 ******************************************************************************
 * @file           : main.c
 * @author         : Auto-generated by STM32CubeIDE
 * @brief          : Main program body
 ******************************************************************************
 * @attention
 *
 * Copyright (c) 2026 STMicroelectronics.
 * All rights reserved.
 *
 * This software is licensed under terms that can be found in the LICENSE file
 * in the root directory of this software component.
 * If no LICENSE file comes with this software, it is provided AS-IS.
 *
 ******************************************************************************
 */

#include <stdint.h>
#include "stm32f103xb.h"
#include "lcd.h"

void delay_ms(uint16_t ms);
void delay_us(uint16_t us);

int main(void)
{
  RCC->APB2ENR |= 1 << 2; 
  RCC->APB2ENR |= 1 << 3; 
  RCC->APB2ENR |= 1 << 4; 

  GPIOB->CRL &= ~(0x0F << 0); 
  GPIOB->CRL |= (0x04 << 0);  

  LCD_Init();
  
  LCD_Send(0x80, 0); 
  LCD_Print("Microcontrolador");
  
  LCD_Send(0xC0, 0);
  LCD_Print("Tarea 2.1");

  uint8_t estado_pantalla = 0; 
  
  uint8_t dia = 8, mes = 4;
  uint16_t anio = 2026;
  uint8_t horas = 23, minutos = 59, segundos = 55;

  while ( 1 )
  {
    if (estado_pantalla == 0) 
    {
      if (GPIOB->IDR & (1 << 0)) 
      {
        estado_pantalla = 1; 
        
        LCD_Send(0x01, 0);
        delay_ms(2); 
      }
    }
    else 
    {
      LCD_Send(0x80, 0); 
      LCD_Print("Fecha:");
      LCD_Send('0' + ((dia / 10) % 10), 1);
      LCD_Send('0' + (dia % 10), 1);
      LCD_Send('/', 1);
      LCD_Send('0' + ((mes / 10) % 10), 1);
      LCD_Send('0' + (mes % 10), 1);
      LCD_Send('/', 1);
      LCD_Send('0' + ((anio / 1000) % 10), 1);
      LCD_Send('0' + ((anio / 100) % 10), 1);
      LCD_Send('0' + ((anio / 10) % 10), 1);
      LCD_Send('0' + (anio % 10), 1);

      LCD_Send(0xC0, 0); 
      LCD_Print("Hora:");
      LCD_Send('0' + ((horas / 10) % 10), 1);
      LCD_Send('0' + (horas % 10), 1);
      LCD_Send(':', 1);
      LCD_Send('0' + ((minutos / 10) % 10), 1);
      LCD_Send('0' + (minutos % 10), 1);
      LCD_Send(':', 1);
      LCD_Send('0' + ((segundos / 10) % 10), 1);
      LCD_Send('0' + (segundos % 10), 1);

      delay_ms(1000);

      segundos++;
      if (segundos >= 60) {
        segundos = 0;
        minutos++;
        if (minutos >= 60) {
          minutos = 0;
          horas++;
          if (horas >= 24) {
            horas = 0;
          }
        }
      }
    }
  }
}

void delay_ms(uint16_t ms) {
  volatile unsigned long t = 0;
  for(uint16_t i = 0; i < ms; i++)
  {
    for(t = 0; t < 800; t++);
  }
}

void delay_us(uint16_t us)
{
  for (volatile unsigned int cycles = 0; cycles < us; cycles++);
}