Hooking up TASCAM TT-M1 to STM32F4 Discovery board

I wrote about my working HID interface in the previous post. Now I can send data to my laptop in a convenient way in a simple HID report because I wrote a Delphi program to send and receive HID reports years ago.
Next step is to wire the Tascam TT-M1 scratch control unit to the board. As STM32F4 series have quadrature encoder interface in some timers, I can easily count the pulses without any line of code in my main loop or without using more interrupts or processor load.

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