Enabling UARTs w PB2 + GEM Stereo

insultcomicdog

I want to enable UART4 and UART5 on my PB2 + Gem Stereo setup. Is the process the same as before with the old Bela, by editing the uEnv.txt in the boot directory of the Bela? Is UART0 enabled by default?

Would this adding this line work?

`uboot_overlay_addr4=/lib/firmware/BB-UART4-00A0.dtbo
uboot_overlay_addr5=/lib/firmware/BB-UART5-00A0.dtbo

console=ttyS0,115200n8
uname_r=4.14.108-ti-xenomai-r143
mmcid=0

enable_uboot_overlays=1`

giuliomoro

not at all, see updated page: https://learn.bela.io/using-bela/technical-explainers/device-tree-overlays/

The bad news is that there's no overlay and it has to be written ... using the BB-UART4 as a starting point, mixed with PB2-BELA and some details from k3-am6232-pocketbeagle2 and/or its includes ...

insultcomicdog

Thanks for the quick reply @giuliomoro . Can I access UART0 RXTX of the PB2 via P 1.30 and P 1.32 through the headers on the Gem cape?

giuliomoro

Snything that's on the PB2 and is exposed can be accessed ... unless it's used for something else. P1.30 and P1.32 are used as bela digital pins. If you don't need them for that function and want to use them for UART, then you can just set the pinmux to UART0 tx/rx (as well as loading the accompanying driver).

If you are using pins that are already used by the PB2-BELA overlay, you may end up with some conflicts that may prevent the loading of some of your fragments unless you've disabled the pins on the PB2-BELA overlay. I think. It used to be like that. Didn't try.