LED blink with FT232RL bitbang mode and ruby

blink.rb

require 'rubygems'
require 'ftdi'
ctx = Ftdi::Context.new
begin
  ctx.usb_open(0x0403, 0x6001)
  begin
    ctx.set_bitmode(0xff, :bitbang)
    100.times do
      ctx.write_data [0xff]
      sleep 0.5
      ctx.write_data [0x00]
      sleep 0.5
    end
  ensure
    ctx.set_bitmode(0xff, :reset)
    ctx.usb_close
  end
rescue Ftdi::Error => e
  $stderr.puts e.to_s
end

Setup

$ brew install libftdi
$ gem install libftdi-ruby

Before running

$ sudo kextunload /System/Library/Extensions/FTDIUSBSerialDriver.kext

Run

$ ruby blink.rb