#include <stdio.h>
#include "pico/stdlib.h"
#include <string.h>
#include "pico/stdlib.h"
#include "hardware/i2c.h"
#include "pico/binary_info.h"
#include "LCD_i2c.h"

#define canal    2 // entrada do sinal ligado ao GPIO 17

volatile int g_timer_0 = 0;
uint16_t contador, freq_RPM, freq_Hz;

void f_contar();
bool timer_0_callback(repeating_timer_t *rt);

int main() {
    // Configuracao
    stdio_init_all();
    int timer_0_hz = 1;
    repeating_timer_t timer_0;
    bi_decl(bi_2pins_with_func(PICO_DEFAULT_I2C_SDA_PIN, PICO_DEFAULT_I2C_SCL_PIN, GPIO_FUNC_I2C));
    lcd_init( );
    if (!add_repeating_timer_us(1000000 / timer_0_hz, 
                                timer_0_callback,
                                NULL, 
                                &timer_0)) {
        printf("Failed to add timer\n");
    }
    // configura o pino 2 como saída digital
    gpio_init( canal );
    gpio_set_dir( canal, GPIO_IN);
    //gpio_pull_up( btn_verde);
    gpio_set_irq_enabled_with_callback ( canal , GPIO_IRQ_EDGE_FALL, true, f_contar);
    contador = 0;
    char valor[128];
    while( true ) {      
      lcd_set_cursor(0,0);
      lcd_string("FREQ:");
      sprintf(valor,"%d[RPM]", freq_RPM);
      lcd_string(valor);
      sleep_ms(500);
      lcd_clear();
      if(g_timer_0){
            g_timer_0 = 0;
      }
    }
}

void f_contar(){
    //printf("Contador: %d\n",contador);
    contador++;
}

bool timer_0_callback(repeating_timer_t *rt) {
    g_timer_0 = 1;
    freq_Hz = contador;
    freq_RPM = contador * 60;
    printf("Frenquency: %d[Hz]  RPM: %d[RPM]\n", freq_Hz, freq_RPM);
    contador = 0;
    return true; // keep repeating
}