[Gnuk-users] Chopstx: USB init code and Supporting CQ STARM

[NIIBE Yutaka]

Hello,

I updated Chopstx a bit.  Integrating the support of STM32 Primer2
by Kaz Kojima, I found that the code was a bit ambiguous.

There are three things for GPIO.

(1) LED

    This is mandatory.  Chopstx assumes its application requires a
    LED.


(2) USB

    This is an optional feature of disconnecting USB bus.  I don't
    know what's the origin, but most of boards of STM32F103 have this
    questionable feature.  FST-01 also has this feature.

    It is questionable and not needed at all, as we can just
    disconnect USB bus from MCU side by configuring RCC (see
    example-cdc/sys.c:usb_lld_sys_shutdown).

    If I will have another opportunity to design a board, I will drop
    this feature.


(3) OTHER

    When analog inputs for NeuG is not on the GPIO port of LED or USB,
    we use this to configure PORT A.

    We can also define this if we use other port for some I/O (like
    CIR input).


I fixed STM32 Primer2 port so that it can initialize analog inputs (as
FST-01 does).

I also added CQ STARM board support back.
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