How to free GPIO20 and GPIO21 for device tree

This post has been de-listed (Author was flagged for spam)

It is no longer included in search results and normal feeds (front page, hot posts, subreddit posts, etc). It remains visible only via the author's post history.

Post Flair (click to view more posts with a particular flair)

Technical Problem

Post Body

I want to make a D-pad with four buttons on GPIO16, 20, 21, and 26. 16 and 26 map to keyboard directional keys using device tree without a problem, but when I try to map 20 or 21 the entire fragment fails to work. They work if I read them as an input pin with Python, but I specifically want them mapped to keyboard keys in the device tree.

I see on the pinouts that GPIO20 and 21 are mapped to PCM. Audio is not enabled in my /boot/config.txt but presumably the pins are configured somewhere else and that's why I can't assign them.

Author

Account Strength

Account Age

9 years

Verified Email

Yes

Verified Flair

Total Karma

154,990

Link Karma

17,534

Comment Karma

136,032

Profile updated: 6 months ago

Posts updated: 7 months ago

TankArchives

Subreddit

r/raspberry_pi

Post Details

We try to extract some basic information from the post title. This is not always successful or accurate, please use your best judgement and compare these values to the post title and body for confirmation.

Posted: 1 year ago
Reddit URL: View post on reddit.com
External URL: reddit.com/r/raspberry_p...