#include <Adafruit_NeoPixel.h>
#include <avr/power.h>

#define PIN_RX 10
#define PIN_TX 11
#define PIXELS 24

// Prepare two independent strips for rx data and tx data
Adafruit_NeoPixel strip_rx = Adafruit_NeoPixel(PIXELS, PIN_RX, NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel strip_tx = Adafruit_NeoPixel(PIXELS, PIN_TX, NEO_GRB + NEO_KHZ800);

void setup() {
  // Initialize both strips to off
  strip_rx.begin(); strip_rx.show();
  strip_tx.begin(); strip_tx.show();

  // Initialize serial port to 115200 baud
  Serial.begin(115200);
}

void loop() {
  if (Serial.available() >= 3) {
    byte b = Serial.read();
    if (b == 0xFF) {
      // Read next two bytes as rx and tx rate
      byte rxrate = Serial.read();
      byte txrate = Serial.read();

      if (rxrate <= 100 && txrate <= 100) {
        showPercentage_rx(strip_rx.Color(0, 0, 255), rxrate);
        showPercentage_tx(strip_tx.Color(255, 0, 0), txrate);
      }
    }
  }
  delay(10);
}

void showPercentage_tx(uint32_t c, uint8_t perc) {
  char lastPixel = (PIXELS * perc) / 100;
  char i = 0;
  while(i < lastPixel) {
    strip_tx.setPixelColor(i, c);
    ++i;
  }
  while (i < PIXELS) {
    strip_tx.setPixelColor(i, 0);
    ++i;
  }
  strip_tx.show();
}

void showPercentage_rx(uint32_t c, uint8_t perc) {
  char lastPixel = (PIXELS * perc) / 100;
  char i = 0;
  while(i < lastPixel) {
    strip_rx.setPixelColor(i, c);
    ++i;
  }
  while (i < PIXELS) {
    strip_rx.setPixelColor(i, 0);
    ++i;
  }
  strip_rx.show();
}