HSERIN doesn´t work

[BrianT]

I think you will find that HSERIN is not a fully self contained command for sending or receiving data through the UART. You must manually manage the CREN bit and probably more for reliable results.

I had many intermittent problems with that command so I gave up and now only use DEBUG, SERIN or SERIN2 which have the advantage they can be assigned to any pin.

HTH
Brian

[Darrel Taylor]

wurm,

Do you have pins 2 and 3 connected together on the 75176? (!RE/DE)
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[dhouston]

RS485 half-duplex is usually single master, multiple slaves with slaves transmitting only after being requested to do so by the master. Is this the code for a slave? If so, could the problem be on the other end?

[wurm]

So thanks for your answers.
I`ve found out the problems.

I have two SP485 drivers in the layout and one was connected as receiver and one as sender.
Then the bus doesn´t work correctly.
The second problem was solluted by setting and resetting cren register.

Best regards,
Wurm