// hello.button-blink.RP2040.1.ino
//
// Seeed XIAO RP2040 button, blink, echo hello-world, single core
//
// Neil Gershenfeld 12/28/23
//
// This work may be reproduced, modified, distributed,
// performed, and displayed for any purpose, but must
// acknowledge this project. Copyright is retained and
// must be preserved. The work is provided as is; no
// warranty is provided, and users accept all liability.
//
// add RP2040 core
//    https://github.com/earlephilhower/arduino-pico
//
#include <Adafruit_NeoPixel.h>

#define BTN_PIN     15   // GP15
#define LED_PIN      0   // GP2  (DIN of the NeoPixel)
#define NUM_PIXELS   1
#define led_pin      2

Adafruit_NeoPixel strip(NUM_PIXELS, LED_PIN, NEO_GRB + NEO_KHZ800);

bool button_up = true;

void setup() {
  pinMode(led_pin,OUTPUT);
  digitalWrite(led_pin,HIGH);

  Serial.begin(9600);

  pinMode(BTN_PIN, INPUT_PULLUP);   // not pressed=HIGH, pressed=LOW

  strip.begin();
  strip.show();
  strip.setBrightness(50);
  strip.setPixelColor(0, strip.Color(255, 165, 0));
  strip.show();

  Serial.println("Ready.");
}

void loop() {

  // Read button and toggle pixel
  bool pressed = (digitalRead(BTN_PIN) == LOW);

  if (pressed && button_up) {
    Serial.println("button down");
    button_up = false;
    strip.setPixelColor(0, strip.Color(255, 165, 0)); // orange
    strip.show();
  } else if (!pressed && !button_up) {
    Serial.println("button up");
    button_up = true;
    strip.clear();
    strip.show();
  }
}