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Better support for SPI-bus sharing. #460

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Better support for SPI-bus sharing. #460

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Commits on Mar 13, 2018

  1. Better support for SPI-bus sharing. 

    ILI9341_sTM uses SPI.beginTransaction() to switch between "fast" and "safe" speeds,
internally. However, it does not initialize the speed for every drawing operation
(for performance reasons, I presume), but rather only before and after operations
requiring the "safe" setting.

This strategy breaks, when the SPI bus is shared with another device (such as an
XPT2046 touchpad driver on the same display, for instance). To handle this case, this
patch exposes the appropriate beingTransaction() call in the API, for the user to call
when switching between devices (and endTransaction() for good style).
    @tfry-git
    tfry-git committed Mar 13, 2018
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