EZ-USB Firmware Skeleton

Back in 2002 I developed my first evaluation board with the Cypress EZ-USB AN2131 microcontroller. Since then I developed several projects using this microcontroller. Each time a dedicated firmware was necessary.

In 2011 a student used one of my firmware projects to develop a firmware for the Keil ULink JTAG adapter, which also has an EZ-USB microcontroller. Unfortunately my firmware had a few files with unclear license conditions, so he re-implemented most files. His work was published as OpenULINK as part of the OpenOCD JTAG driver.

I used his improved firmware as starting point for the development of a firmware skeleton for the Cypress EZ-USB microcontroller. Please find the source code at https://github.com/hansiglaser/ezusb-firmware.

Keil ULink

Some time ago I've investigated the Keil ULink JTAG adapter. Note that this is version 1, not the ULink2, ULinkPro or ULink-ME. The following image shows the schematic (the link opens a PDF file), previously posted at Mikrocontroller.net.

The device is built around the well-known Cypress AN2131 EZ-USB microcontroller and has additional 32 kByte external memory. Level shifters are used for the JTAG signals, which are available at 3 connectors for Infineon OCDS, ST and ARM.

Since the device is quite generic, any other things can be done with it. A few students used it to program their custom firmware and PC software (running on Linux) to use the device to download ATmega and ARM software as well as an OpenOCD driver. Links and details will follow.

Unfortunately the work is only tested with the ULink version 1. Does anybody have a ULink2 and is interested to borrow it to us for investigations and firmware adoption?