/******************************************************************************
   Nome do Arquivo 	: main.c

   Descrição       	: Arquivo principal aula 5, exemplo 1

   Ambiente			    : WOKWI e RP2040 C/C++ SDK

   Responsável		  : Weslley M. Torres

   Versão/Data		  : 1.0.0 - 25/03/2024 - Initial version

 *****************************************************************************/

/******************************************************************************
  HEADER-FILES (Somente os arquivos necessários nesse arquivo)
******************************************************************************/
#include <stdio.h>
#include "pico/stdlib.h"
#include "display_lcd.h"
#include "hardware/gpio.h"
#include "hardware/timer.h"
#include "hardware/irq.h"
/*****************************************************************************/

/******************************************************************************
  Variaveis Globais
******************************************************************************/
uint16_t timer_display = 0;

// Low-level alarm infrastructure we'll be using
#define ALARM_NUM 0
#define ALARM_IRQ TIMER_IRQ_0

#define DELAY 100000 // 1/Fs (in microseconds)

/*****************************************************************************/

/******************************************************************************
  Prototipos das funções
******************************************************************************/

void system_init(void);
void alarm_irq(void);
void button_callback(uint gpio);
/*****************************************************************************/

/******************************************************************************
   Funcao:		int main(void)
   Entrada:		Nenhuma (void)
   Saída:		Nenhuma (void)
   Descrição:	Função principal
 *****************************************************************************/
int main() 
{
  uint8_t estado = 1;
  uint8_t nome[]="Weslley";
  uint8_t ra[]="RA:123456";

  uint8_t nome_dois[]="Antonio";
  uint8_t ra_dois[]="RA:987654";

  stdio_init_all();

  printf("Microcontroladores - Aula 15\n");
  sleep_ms(250);

  system_init();



  while(1) 
  { 
    if((estado == 1) && (timer_display == 0))
    {
      LIMPA_DISPLAY();
      posicao_cursor_lcd(1, 1);
      escreve_frase_ram_lcd(nome);

      posicao_cursor_lcd(2, 1);
      escreve_frase_ram_lcd(ra);
      timer_display = 30;
      estado++;
    }
    else if((estado == 2) && (timer_display == 0))
    {
      LIMPA_DISPLAY();
      posicao_cursor_lcd(1, 1);
      escreve_frase_ram_lcd(nome_dois);

      posicao_cursor_lcd(2, 1);
      escreve_frase_ram_lcd(ra_dois);
      timer_display = 30;
      estado++;
      if(estado>2)
      {
        estado = 1;
      }
    }

    sleep_ms(5);
  }
}

/******************************************************************************
   Funcao:		void system_init(void)
   Entrada:		Nenhuma (void)
   Saída:		Nenhuma (void)
   Descrição:	Inicializa sistema (microcontrolador e periféricos)
 *****************************************************************************/
void system_init(void)
{
  uint64_t target = 0;
  printf("Init Hardware ....\n");
  sleep_ms(10);

  /* o trecho de codigo abaixo realiza a inicializacao da interrupt de timer  */
  // Enable the interrupt for the alarm (we're using Alarm 0)
  hw_set_bits(&timer_hw->inte, 1u << ALARM_NUM) ;
  // Associate an interrupt handler with the ALARM_IRQ
  irq_set_exclusive_handler(ALARM_IRQ, alarm_irq) ;
  // Enable the alarm interrupt
  irq_set_enabled(ALARM_IRQ, true) ;
  
  target = timer_hw->timerawl + DELAY;

  // Write the lower 32 bits of the target time to the alarm register, arming it.
  timer_hw->alarm[ALARM_NUM] = (uint32_t) target;

  /* Fim da inicialização do interrupcao de timer */

  init_lcd();
}


/******************************************************************************
   Funcao:		void alarm_irq(void) 
   Entrada:		Nenhuma (void)
   Saída:		  Nenhuma (void)
   Descrição:	Função tratamento interrupcao do timer 0
 *****************************************************************************/
void alarm_irq(void) 
{
  static bool toggle = false;
  printf("Timer interrupt occurred!\n");
  // Clear the alarm irq
  hw_clear_bits(&timer_hw->intr, 1u << ALARM_NUM);

  uint64_t target = timer_hw->timerawl + DELAY;

  // Write the lower 32 bits of the target time to the alarm register, arming it.
  timer_hw->alarm[ALARM_NUM] = (uint32_t) target;
  if(timer_display) timer_display--;


}

/******************************************************************************
   Funcao:		void button_callback(uint gpio)
   Entrada:		uint gpio - number of gpio
   Saída:		Nenhuma (void)
   Descrição:	Função tratamento interrupcao do botao
 *****************************************************************************/
void button_callback(uint gpio) 
{
    
}