Making own JTAG for ARM processor

[patlas]

Hi,

I want to make my own JTAG for ARM processor Does somebody know where may I find some information of this protocol?
I think that AVR processor will be good for that solution but I can't find any valuable information of JTAG ARM protocol

 

[bigdogguru]

Most commercial JTAG programmer/debuggers use an ARM variant, such as STM32 or Atmel SAM.

However, you can construct a simple "wiggler" style JTAG programmer using only simple logic ICs:

ARM JTAG DIY Schematic

ARM JTAG DONGLE DIY User Guide

BigDog

 

[patlas]

I didn't express my idea as clearly as I want to
I want to "invent" my own JTAG to ARM processors based for example on AVR
Some "block" diagram:
USB/RS232/... -> AVR/STM32 (heart of my programmer) -> programming ARM family

 

[tpetar]

What ARM device list you plan to support with your AVR based programmer ?

 

[patlas]

I have been thinking about STM32f10x and simple veriosion of LPC
I want to write almost whole code as PC interface, AVR/STM will be only a data receiver and connector to ARM processor. Thats projecdt gave me my university professor so I've to do it