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The name GPJtag means "General Purpose Jtag"

I have finished it on 2016, the schemitc and pcb pushed to Github,
The stm32f1 source code is not review, and need to rewrite and clean style,
so just not release, it is full of debug comment:)

The hardware outline is fixed with st-link case size.
The source codes using two SPI, SPI1 is master, SPI2 is slave: