#include <stdio.h>
#include "pico/stdlib.h"

#define ENCODER_CLK 10
#define ENCODER_DT  11
#define ENCODER_SW  12



volatile int32_t encoder_count = 0;  // Counter for encoder position

// Interrupt handler for encoder signals
void encoder_isr(uint gpio, uint32_t events) {
    bool clk_state = gpio_get(ENCODER_CLK);  // Read Clock pin state
    bool dt_state = gpio_get(ENCODER_DT);    // Read Data pin state

    if (clk_state == dt_state) {
        encoder_count++;  // Clockwise rotation
    } else {
        encoder_count--;  // Counter-clockwise rotation
    }
}

int main() {
    stdio_init_all();  // Initialize standard I/O

    // Initialize encoder pins as inputs with pull-up resistors
    gpio_init(ENCODER_CLK);
    gpio_set_dir(ENCODER_CLK, GPIO_IN);
    gpio_pull_up(ENCODER_CLK);

    gpio_init(ENCODER_DT);
    gpio_set_dir(ENCODER_DT, GPIO_IN);
    gpio_pull_up(ENCODER_DT);

    gpio_init(ENCODER_SW);
    gpio_set_dir(ENCODER_SW, GPIO_IN);
    gpio_pull_up(ENCODER_SW);

    // Set up interrupts for CLK and DT pins
    gpio_set_irq_enabled_with_callback(ENCODER_CLK, GPIO_IRQ_EDGE_RISE | GPIO_IRQ_EDGE_FALL, true, &encoder_isr);
    gpio_set_irq_enabled(ENCODER_DT, GPIO_IRQ_EDGE_RISE | GPIO_IRQ_EDGE_FALL, true);

    while (1) {
        printf("Encoder Count: %d\n", encoder_count);

        // Optional: Check button press (if switch is available)
        if (gpio_get(ENCODER_SW) == 0) {
            printf("Button Pressed!\n");
        }
        sleep_ms(100);  // Delay for stable output
    }
}