Hi list, I was design and build 2 jtag hardware adapters (one USB and other for the parallel port). The USB design work but too slow. Now I'm trying to design a new circuit using a microcontroller with usb interface. The target of the design is study how work the JTAG interface and OpenOCD for application debug for ARM cortex m3 processors. The question is: ¿is there some guide about how can write a driver for new jtag hardware adapters? In my original jtag USB adapter design, I used as template a parallel port driver, re writing the functions to work. But the result was is too slow. ¿What is the best way to add new jtag interface hardware to OpenOCD? Thank you very much Sergio
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