Post #3608774
2026-07-05 13:56 UTC
Hi Raspberry Pi experts, I can't sort out this error: 'GPIO not allocated' for a HyperPixel 4.0 rectangular touchscreen connected to a pi 4B. Here is the full report I filed at the support forum:
https://forums.pimoroni.com/t/gpio-not-allocated-error-for-hyperpixel-4-0-on-a-raspberry-pi-4b/28950
What can cause this error if no other devices are using the pins? How to overcome it?
#RaspberryPi #RaspberryPi4B #HyperPixel4
Replies (2)
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@gvenema@fairmove.net 2026-07-05 17:13
@albertcardona@mathstodon.xyz Not an expert, but you might need a second overlay. dtoverlay=vc4-kms-v3d https://forums.raspberrypi.com/viewtopic.php?t=387056&__cf_chl_f_tk=0ZPJmqyDBxGRaHTdndrmaSRMMEC43ZjHoxZZbRQeTyM-1783271419-1.0.1.1-4KkKMFh8MMOTZtaZMFxyTMgVsoQjVyzDz5QfBJuCO5k
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@concretedog@mastodon.social 2026-07-05 14:12
@albertcardona@mathstodon.xyz is it the thing where some pins are already allocated to SPI? I had that recently with a LinuxCNC on Pi build. I had to adjust the gpio config.