I am writing to you because I have a problem with the RS485 communication.
I’m using the “Beaglebone Comms Cape A2”.
I use UART4 port (/dev/ttyS4)
I configured PIN 13 and 11 as UART and all serial parameters are correct.
I also use the latest version of the board firmware.
The problem is that I can only send data correctly but I don’t receive anything. Can you suggest me a solution? Thank you
Hi Domenico,
I am currently experiencing the same issue described. Did you find a resolution to the problem?
Cole
Hello @cpeet and @Domenico_Traina ,
I am not sure exactly what image and firmware you are referring to currently. I use the 2023-10-07 image with Bookworm as the OS and Bullseye as the OS.
I have noticed some things different on each, different OS.
Anyway, /dev/bone/uart/* is where the UART pins are located now for file description.
Also, the COMMS Cape should be plug and play for specific kernels and images.
For instance, on Bullseye 2023-10-07, I saw the COMMS Cape .dtbo file in the /overlays/ section of the fs.
It, once attached and powered, should just work. I am not 100% sure of the COMMS Cape with the current Bookworm distro produced by the beagleboard.org people.
Seth
P.S. I hope this helps a bit. If you two are having any more trouble with the Cape, maybe try a .dts of known past that used to work and update it. I know the new specification is out for the DTS or has been out. I am not sure which exact DTS spec. was used when the COMMS Cape was in action.
Just some ideas here…
Seth - this is insightful info. I greatly appreciate your help with this and we got it resolved on our end.
Thanks
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hello im facing the same problem could you tell me how did you fixed it !
Hi! For to working rs485 cape you must have external supply!!
i tried it but it the same problem , i tested the connection of the pin p9.11 And P9.13 with serial USB and also i can only transmit without receiving