# Setup for all loops
led = ESP32::GPIO_NUM_2
ESP32::GPIO::pinMode(led, ESP32::GPIO_MODE_OUTPUT)

# 53 kHz
loop {
  ESP32::GPIO::digital_write(2, 1)
  ESP32::GPIO::digital_write(2, 0)
}

# 42 kHz
loop {
  ESP32::GPIO::digital_write(led, ESP32::HIGH)
  ESP32::GPIO::digital_write(led, ESP32::LOW)
}

# 35 kHz
loop {
  ESP32::GPIO::digital_write(ESP32::GPIO_NUM_2, ESP32::HIGH)
  ESP32::GPIO::digital_write(ESP32::GPIO_NUM_2, ESP32::LOW)
}

# Setup
include Denko
led = DigitalIO::Output.new(pin: 2)

# 67 kHz
# Literal values are fastest.
# Instance methods appear faster than Class/Module methods.
loop do
  $board.digital_write(2, 1)
  $board.digital_write(2, 0)
end

# 66 kHz
# Still fast with a local variable.
pin = 2
loop do
  $board.digital_write(pin, 1)
  $board.digital_write(pin, 0)
end

# 50 kHz
# led.pin is a getter for led@pin instance var.
loop do
  $board.digital_write(led.pin, 1)
  $board.digital_write(led.pin, 0)
end

# 40 kHz
# #digital_write also saves given value to led@state. Extra overhead.
loop do
  led.digital_write(1)
  led.digital_write(0)
end

# 32 kHz
# #on and #off just do the two lines in the above example.
loop do
  led.on
  led.off
end

# 32 kHz
# Aliases #on and #off. Aliasing looks like it's free.
loop do
  led.high
  led.low
end

# 18 kHz
# This LOOKS like it should be faster. It's not passing through led, not setting @state.
# But reading HIGH and LOW from Board are enough to make it slow.
# There are a lot of constants defined in Board. Maybe more makes it slower?
loop do
  $board.digital_write(2, Board::HIGH)
  $board.digital_write(2, Board::LOW)
end

# 16.5 kHz
# Even worse using reader method for pin number.
loop do
  $board.digital_write(led.pin, Board::HIGH)
  $board.digital_write(led.pin, Board::LOW)
end

# 16 kHz
# Worse again using reader methods for HIGH and LOW.
loop do
  $board.digital_write(led.pin, $board.high)
  $board.digital_write(led.pin, $board.low)
end