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

#define RGB_BASE_PIN 17
const uint32_t RGB_MASK = 1 << RGB_BASE_PIN |        // Pin 17
                          1 << RGB_BASE_PIN + 1 |    // Pin 18
                          1 << RGB_BASE_PIN + 2;     // Pin 19

int main() {
    stdio_init_all();
    // Enable pins 17, 18 & 19 as input 
    gpio_init_mask(RGB_MASK);
    uint32_t gpio;
    while (true) {
        // Extract desired bits from GPIO with RGB_MASK and shift right
        // This gives us a 3 bit value in the form 0b<b><g><r>
        gpio = (gpio_get_all() & RGB_MASK) >> RGB_BASE_PIN;
        // Perform comparisons on the 3 bits to determine the state of the RGB LED
        switch(gpio) {
            case 0b110: // red
                printf("off\n");
                break;
            case 0b100: // yellow
                printf("optical\n");
                break;
            case 0b000: // white
                printf("aux\n");
                break;
            case 0b101: // green
                printf("line-in\n");
                break;
            case 0b011: // blue
                printf("bluetooth\n");
                break;
            case 0b111: // off
                printf("none\n");
                break;
            default:
                printf("unknown\n");
        }
        sleep_ms(500);
    }
    return 0;
}