#include <stdio.h>
#include "rom/gpio.h"
#include "driver/gpio.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"

#define Keypad_R1 15
#define Keypad_R2 2
#define Keypad_R3 0
#define Keypad_R4 4
#define Keypad_C1 16
#define Keypad_C2 17
#define Keypad_C3 5
#define Keypad_C4 18

#define NUM_ROWS 4
#define NUM_COLS 4

//Define os GPIOs para as linhas e colunas do keypad
uint8_t row_gpios[NUM_ROWS] = {Keypad_R1, Keypad_R2, Keypad_R3, Keypad_R4};
uint8_t col_gpios[NUM_COLS] = {Keypad_C1, Keypad_C2, Keypad_C3, Keypad_C4};

//Define o mapa de teclas do keypad
char keypad_layout[NUM_ROWS][NUM_COLS] = {
    {'1','2','3','A'},
    {'4','5','6','B'},
    {'7','8','9','C'},
    {'*','0','#','D'}
};

void app_main(void)
{
//configura os pinos gpios da linha do keypad
for(int i=0; i<NUM_ROWS; i++){
    gpio_pad_select_gpio(row_gpios[i]);
    gpio_set_direction(row_gpios[i], GPIO_MODE_OUTPUT);
    gpio_set_level(row_gpios[i], 1);
}

//Configura os gpios de coluna da keypad em modo pullup
for(int i=0; i<NUM_COLS; i++){
    gpio_pad_select_gpio(col_gpios[i]);
    gpio_set_direction(col_gpios[i], GPIO_MODE_INPUT);
    gpio_set_pull_mode(col_gpios[i], GPIO_PULLUP_ONLY);
}

while(1){
    for(int r=0; r<NUM_ROWS; r++){
        gpio_set_level(row_gpios[r],0);
        vTaskDelay(1/portTICK_PERIOD_MS);
        for(int c=0; c<NUM_COLS; c++){
            if(gpio_get_level(col_gpios[c]) == 0){
                printf("Tecla pressionada: %c\n", keypad_layout[r][c]);
                while(gpio_get_level(col_gpios[c])==0){
                    vTaskDelay(10/ portTICK_PERIOD_MS);
                }
            }
        }
        gpio_set_level(row_gpios[r],1);
    }
    vTaskDelay(50/portTICK_PERIOD_MS);
}
}