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notro / fbtft

Linux Framebuffer drivers for small TFT LCD display modules. Development has moved to https://git.kernel.org/cgit/linux/kernel/git/gregkh/staging.git/tree/drivers/staging/fbtft?h=staging-testing
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Disabling/re-enabling fbtft at will #459

Closed theLuthier closed 7 years ago

theLuthier commented 7 years ago

I'm working on retro handheld project using rpi3 + retropie + pitft 2.8" + fbtft. Most of the time I expect to use the system in handheld mode via pitft + fbtft, which I have setup and it's working beautifully.

However I'd like to maintain the ability to plug in a composite cable from the rpi to a TV for playing on a bigger screen. Could you help me figure out how I could essentially disable fbtft while re-enabling composite out, and then back again? Ideally I want to press a button connected to GPIO to run a script for swapping display out modes without having to reboot.

Is this even possible? I've been playing around with the tvservice -c command which clearly sends an SDTV signal to my TV, but only a blank screen. I figure it's something to do with fbtft. Any help is appreciated! I've used fbtft on 2 projects and it's fantastic - Thanks for your work.

notro commented 7 years ago

Those have different framebuffers so they operate independently: /dev/fb0 is HDMI/SDTV and /dev/fb1 is fbtft I think this question is better asked in the pi forums.

theLuthier commented 7 years ago

Ok I'll try there - Thanks for the reply @notro.