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fix wrong states on PE output pins (and SD-card failure on restart) #278

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fix wrong states on PE output pins (and SD-card failure on restart) #278

wants to merge 1 commit into from

Commits on Dec 9, 2023

  1. fix wrong states on PE output pins (and SD-card failure on restart) 

    The output register status buffer was initialized fix to {0xff,0xff}
although the output registers were set to {0x00,0x00}.
That buffer is used by Port_Write() to determine the values of the
bits for the other pins. So those get set to 1 (high).

Since the peripheral power on the Espuino 4-layer mini PCB is switched
on by setting a pin on the PCA9555 low, that power is first turned on
(by Port_Init()), then turned off (by the Port_Write() call in
AudioPlayer_Init()) and then turned on again (by Power_PeripheralOn()).
That caused a 12.5 millisecond disruption of the external 3.3V which
some SD-cards don't like.
    @r-schmidt
    r-schmidt committed Dec 9, 2023
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