On Fri, Jun 17, 2022 at 06:45:02PM -0500, Steve Fatula wrote: > Is there anyway to get an attached serial port working on Debian and > raspberry PI 4? It appears the tested installs want to use it as a serial > console, I do not. I want to use UART1, the PL011, as an RS232 port to a > projector. > > I can do this using Raspberry OS, but, not Debian using the tested installs. > There is no way to disable Bluetooth via the overlays used on Raspberry OS. > I can sort of mess around and stop the console from being started on ttyS1, > but no way to use the port as a serial port to send and received data. > Apparently the dtoverlays are not there. > > So, is there any way to really use a serial port, attached to any GPIO pins, > as a real RS232 port using Debian images? if so, what do I need to disable > or enable? > > As mentioned, had it working on Raspberry OS which is based on Bullseye. But > unfortunately I can't use Raspberry OS for our usage.
>From what I have read you should be able to enable uart2 through uart5 on the Pi4B using the dts overlays. I don't have a Pi4 yet so no experience with doing that unfortunately. https://forums.raspberrypi.com/viewtopic.php?t=244827 seems to have some talk about it though. -- Len Sorensen
