Here is a fancier version of the test gadget firmware. Basic structure is still the same:

• START
• (150ms delay)
• Burst of triggers
• (150ms delay)
• HALT

Switches control the structure of the triggers as follows. Note that up is ON or '1'.

  SW7 (left)  ON to enable triggers (START, HALT always happen)
  SW6..SW4    spacing:  001 is 750ns, 002 is 1.5us up to 111 is 5.4us
  SW3..SW0    number of triggers from 1 to 16

• Bit file: gadget_v2.bit (copy to USB stick, erase any other files there)

-- EricHazen - 2015-10-29