Good day,
i.M6UL refers - (based on variscite SOM Yocto build )
I recently discovered, on completion and now production of my hardware platform,
that I have interpreted UART DCE/DTE Modes incorrectly -
Unfortunately the correct doc-info only came forward once we went into production with you,
making me aware of the following issue -
In my design, as seen from the processor, the following h/w pad/pin config has been wired -
RXD < in
TXD > out
RTS > out
CTS < in
Testing on h/w platform (DCE mode) the serial comms work with h/w flow OFF
When enabled, no comms, since in DCE mode RTS dir = in, CTS dir = out.
In DTE mode, RTS dir out, CTS dir in, but TXD = in, RXD = out.
This also presents a problem, since now there will be no serial comms,
since txd/rxd dir is reversed, with reference to my h/w wiring-
What I would like to know, are there any additional register-set configuration
to allow my h/w config to work, iow, to allow my particular h/w configuration to work,
or is the only option to scrap the production units, (clearly the last option)
or to modify > swop RTS/CTS signals with jumpers in DCE mode,
or to swop TXD/RXD in DTE with jumpers.
Thank you for your advice on this matter.
Regards,
Gerhard Laubscher
Cape Town
South Africa
