IMX93evk zephyr RS485

zefox — Tue, 07 Oct 2025 09:40:44 GMT

Hi,

I have been working on this issue for 2 days now and I am not progressing anymore. I am trying to use OSDP in Zephyr through the control_panel example. I have provided my files in the zip I attached below.

My wiring is as follows:

zefox_0-1759829994100.png

I have checked that the GPIO17 is indeed multiplexed correctly. This is correct.
I have tried using pull-down resistors (10K) on the DE&/RE pin. Didn't do anything.
I have tried sending test data directly using the serial driver in Zephyr. Didn't work.

I can tell it is sending correctly because my reader is correctly receiving a message. But the DE pin always stays high. This means it won't receive anything. Which is exactly what I am observing.

I have had this issue with the STmicroelectronics UART driver as well where the hardware-controlled DE pin had the same issue.

How do i fix this issue

Re: IMX93evk zephyr RS485

Manuel_Salas — Tue, 07 Oct 2025 17:39:09 GMT

Hello @zefox

Unfortunately, this channel does not provide support to Zephyr.

Best regards,

Salas.

topic Re: IMX93evk zephyr RS485 in Zephyr Project

IMX93evk zephyr RS485

Re: IMX93evk zephyr RS485