In my previous post, I showed how to use SKiDL to describe the circuit for a simple USB-to-JTAG interface circuit. That circuit used a PIC32MX microcontroller in a 28-pin SSOP package:

and the corresponding SKiDL code was:

pic32 = Part(pic32_lib, 'pic32MX2\*0F\*\*\*B-SSOP28-SOIC28-SPDIP28',
             footprint='Housings_SSOP:SSOP-28_5.3x10.2mm_Pitch0.65mm')

I …

This post describes using SKiDL for a USB-to-JTAG interface that was taken all the way from concept to physically building a device.

The interface is pretty simple. It's built from the following stuff:

• A PIC32MX220 microcontroller.
• A 12 MHz crystal.
• Some reset circuitry.
• A six-pin Microchip programming header (for the …