Comments (3)
RobertCNelson
commented on August 17, 2024
@Bouni the default serial_8250_omap does a bad job at real RS485, sadly you'll need to rebuild the kernel and switch to CONFIG_SERIAL_OMAP.
Disable:
CONFIG_SERIAL_8250_OMAP=y
CONFIG_SERIAL_8250_OMAP_TTYO_FIXUP=y
Enable:
CONFIG_SERIAL_OMAP=y
Regards,
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Bouni
commented on August 17, 2024
@RobertCNelson
Thanks for the fast answer!
Are there instructions somewhere on how to do that? Never built a kernel before.
I assume that its smart to do it on a PC with more power an cross compile, right?
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ffeldbauer
commented on August 17, 2024
Hey,
I'm using the Debian 10 image with Kernel version 5.4.66-ti-r18.
Based on the UART4-RS485 overlay, I wrote an overlay for UART5 using P8.37 (Tx), P8.38 (Rx), P8.32 (de/re).
I have the problem that gpio0_11 doesn't go high when transmitting.
Is this still a problem of serial_8250_omap in Kernel version 5.4?
Regards,
Florian
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