#include <stdio.h>
#include "pico/stdlib.h"
#include "hardware/timer.h"
#include "pico_keypad4x4.h"
#include <string.h>
#include "hardware/i2c.h"
#include "pico/binary_info.h"
#include "LCD_i2c.h"

uint columns[4] = { 2, 3, 4, 5 };
uint rows[4] = { 6, 7, 8, 9 };
char matrix[16] = {
    '1', '2' , '3', 'A',
    '4', '5' , '6', 'B',
    '7', '8' , '9', 'C',
    '.', '0' , '=', 'D'
};

int main() {
    stdio_init_all();
    lcd_init( );
    pico_keypad_init(columns, rows, matrix);
    char key;
    while (true) {
      lcd_set_cursor(0,0);
      lcd_string("KEY:");
      key = pico_keypad_get_key();
      if (key != 0){
          printf("Key pressed: %d\n", key-48);
          //sprintf(valor,"%d", valor_freq);
          lcd_set_cursor(1,0);
          lcd_string("%c",key);
      }
      busy_wait_us(50000);
    }
}