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by kelroy
Wed Nov 27, 2019 7:56 pm
Forum: Device Tree
Topic: DPI displays - dpi24 overlay fails on RPi4 (SOLVED)
Replies: 39
Views: 8927

Re: DPI displays - dpi24 overlay fails on RPi4

The problem with the dpi24 overlays is that it hangs its pinmux changes to the framebuffer "fb" node. Pi 4 relies on the vc4-fkms-v3d overlay being applied which disables the old framebuffer and any associated pinmux settings. A fix for this is for the dpi24 overlay to hedge its bets and attach to ...
by kelroy
Wed Nov 06, 2019 10:54 am
Forum: Device Tree
Topic: Fuel gauge devicetree/driver integration problem
Replies: 8
Views: 1780

Re: Fuel gauge devicetree/driver integration problem

Thanks PhilE, its hard to understand the dtb... i will continue to read and improve it.

After a few more test, the fuel gauge its working perfectly. Thanks for your help¡¡.
by kelroy
Tue Nov 05, 2019 3:29 pm
Forum: Device Tree
Topic: Fuel gauge devicetree/driver integration problem
Replies: 8
Views: 1780

Re: Fuel gauge devicetree/driver integration problem

You'll need to include something like this: interrupt-parent = <&gpio>; interrupts = <43 2>; // falling edge triggered I understand that the interrupt-parent calls a gpio fragment, and this its made in other dtbs of the raspberry, right?. We just evoque the node to add our interrupt. With this part...
by kelroy
Tue Nov 05, 2019 2:46 pm
Forum: Device Tree
Topic: Fuel gauge devicetree/driver integration problem
Replies: 8
Views: 1780

Re: Fuel gauge devicetree/driver integration problem

As I said above, "you appear to have misspelled "fragment". Without fixing that I think the firmware may treat your overlay as being empty. Please run fix the typo and run "dtc -I fs /proc/device-tree | grep MAX1726x" to confirm that the overlay has been applied. Oh, i really didint see that error,...
by kelroy
Tue Nov 05, 2019 2:00 pm
Forum: Device Tree
Topic: Fuel gauge devicetree/driver integration problem
Replies: 8
Views: 1780

Re: Fuel gauge devicetree/driver integration problem

The first step is to confirm whether your overlay is applying correctly to the base dtb. You can do this by typing "sudo vcdbg log msg" and looking for errors from the firmware. I think you will see errors because you appear to have misspelled "fragment". You can also verify if the overlay is prese...
by kelroy
Tue Nov 05, 2019 11:55 am
Forum: Device Tree
Topic: Fuel gauge devicetree/driver integration problem
Replies: 8
Views: 1780

Fuel gauge devicetree/driver integration problem

Hi, i am under a project (will be full opensource, hardware too with schematics) where i want to integrate to the raspberry pi computer module a display, fuel gauge... and others peripherals, to create a retropie console. Actually i have working the PCM and Display, but i am having problems with the...
by kelroy
Fri May 24, 2019 9:36 am
Forum: HATs and other add-ons
Topic: LVDS add-on for Raspberry models with 40pin GPIO
Replies: 113
Views: 78550

Re: LVDS add-on for Raspberry models with 40pin GPIO

Yes, finally i made it works. At least was hard but i found this post that explain a bit things and with that and other reads i found a solution.

That its the post i saw: https://timetoexplore.net/blog/video-ti ... 720p-1080p
by kelroy
Thu May 23, 2019 9:34 am
Forum: HATs and other add-ons
Topic: LVDS add-on for Raspberry models with 40pin GPIO
Replies: 113
Views: 78550

Re: LVDS add-on for Raspberry models with 40pin GPIO

Hi, Details on DPI are here https://www.raspberrypi.org/documentation/hardware/raspberrypi/dpi/README.md Your display spec should have all the details to figure out dpi_oitput format. You've posted some of the timing details already, polarity infos should be available from some chart in your diepla...
by kelroy
Wed May 22, 2019 8:32 pm
Forum: HATs and other add-ons
Topic: LVDS add-on for Raspberry models with 40pin GPIO
Replies: 113
Views: 78550

Re: LVDS add-on for Raspberry models with 40pin GPIO

Hi! Interested in your product. I can’t PM you. Could you send me your email over here: tomtom.mk2 at gmail Thanks in advance. Tomek PM function has been disabled on the RPI forum quite a while ago. Well, I would not call the board 'a product'; it's more a proof-of-concept. Will send e-mail with do...

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