I have written a program to use the GPIO pins for input/output purposes to
control other units. I checked the PXA270 spec sheet and used pin 10, 17,
and 19 on the 80 pins connector. However, when pins are connected to ground
(I need a zero signal), the processor fails to boot up. I also noticed that
the pins will work fine after the processor are booted. So my conclusion is,
the processor somehow resets all the pins to input as it boots up and
receives signals from the pins that were connected to ground, and it halts
thinking there are devices trying to connect?
In this case, I can't connect the pins to anything signal before the
processor has booted up, since I would like to connect the pins to a sensor.
Is there a way to solve this problem to allow my processor to boot up even
if it's connected to a sensor? What if I put a switch at the sensor, and
turned it off, would the processor be able to boot up?
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