topic MCUXpresso - can't change pin mode for LPC812 in LPC Microcontrollers

MCUXpresso - can't change pin mode for LPC812

aaronm — Tue, 13 Dec 2022 04:01:06 GMT

I assigned a few pins for SPI1, and the "mode" is inactive: I can't set them to PullUp. It's almost like a previous setting for those pins is overriding all of my attempts to change that setting. Am I overlooking something? Even if I close out mcuxpresso, edit the XML and .c/.h files, it will not let me change those. In the image, see the "Mode" column; note the greyed out "n/a".

I'm not using a specific board: I'm using a raw chip. I've been able to get this chip and configuration to work for other purposes, but for SPI1, it's not letting me change the mode. I'm already using SPI0 for something else, so I can't just change things.

Re: MCUXpresso - can't change pin mode for LPC812

Alice_Yang — Wed, 14 Dec 2022 06:54:06 GMT

Hello @aaronm .

PIO0_10 and PIO0_11 are true open-drain pins, can not config "MODE",

About detail you can check from UM10601.

Alice

Re: MCUXpresso - can't change pin mode for LPC812

aaronm — Wed, 14 Dec 2022 07:04:06 GMT

Ah! Section 7.2. It figures that the two pins I wanted to use in that context - mostly just for location relative to other devices - were unusable. I appreciate the answer, though.