My understanding (and someone can PLEASE) correct me if I'm wrong) is that although there is a user space interface to RS485 via ioctl, the drivers may not support it. At best you have to recompile the kernel with the "other" driver, but that does not support DMA. There seem to be hooks to specify which GPIO pin sets the direction of the transceiver, like in the device tree overlay files, but it's impossible to see if or where this is made available in the kernel for a driver to use. I gave up and just went with a RS485-USB device and never looked back.
On Tue, Jun 16, 2020, 6:24 PM Bekir Bahadir <[email protected]> wrote: > Also Im trying to get rs485 work over gpio with active high when > transmitting. Can anyone help? Ive creqtet a net dts with the gpios for > enabling the transmitter. Fo i need to patch the kernel for rs485 or is it > alreqdy included in the omap driver? > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/ce353b99-82d0-4b35-b310-fc4d756d391co%40googlegroups.com > . > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAH0DfMwJpqSgo3%2BXR_OCqRxSVXW1n8dOsR-yZPYUBzZz0AY0Aw%40mail.gmail.com.
