On Fri, Oct 21, 2005 at 10:35:43AM +0200, Frank Behrens wrote: > Hi, > > I'm writing a device driver for UART with a protocol, that can not be > handled by the default sio(4) driver. The driver works fine - the > only problem I have is to disable the attachment of sio(4) driver to > the device.
If it is just needing tx-enable for RS485 you might use a standard FT232BM chip - they have support to do it transparently. However, if you need 9-bit or complex timing it's problematic. But even with 16550 and special kernel driver timing is hard to do it right. I personally build specialized USB and Ethernet devices for doing Modbus/RTU RS485 timing. -- B.Walter BWCT http://www.bwct.de [EMAIL PROTECTED] [EMAIL PROTECTED] _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
