I read from somewhere saying that GP77 is reserved for SD interface and unable to be configured to use as normal GPIO? Is there anyway we can force it to GPIO? If so, how can I do it?
This question was already discussed on Re: Can't use GPIO 77 with MRAA. The GPIO77, as you said, is reserved for the SD Card driver. It's not possible to configure it as GPIO. Check the thread above for more details.
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