[ts-7000] Using the TS7300 FPGA serial ports in 9-bit mode and RTS as TX-enable

["flind1972" <>]

Hello all,

we have purchase a TS7300 board and want to do alot of RS485 
communication. We want to connect a custom adder-board with 8 opto 
isolated RS485 drivers. The driver will be switched from transmitter 
to reciever with the RTS line (TX-enable).

I've now did some measurements on COM3 (9-bit, 115k2 bps) and I've 
found that the turn-around time from send/recv. is too long (800 us). 
We need a turn around time of 100 us max. Why is this so long? I 
think it's the way the kernel is handling the serial communication... 
I know there are UARTs with auto-RTS and they, if the last bit is 
clocked out, will immidiatly switch the RTS signal off. Can this be 
done with these soft-UARTs?

I think we have to write our own serial device-driver, but I'm 
missing some data. I need the (soft-)UART registers from the FPGA.

Has anyone done something along the road? Any ideas?

thanks,
Frank



 
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