rs485 in imx53 board

[agamarramu]

Hi Yuri,

I see this issue is quite old but we are still having some problems. In your answer, you say that "Additional software is needed to check when all data bits are really sent to line." Can you explain how to do it?

I have seen there is a bit called TXFE (Transmit Buffer FIFO empty) inside the UART Status Register 2 (UARTx_USR2) that could help us but I don't know how to read that register in the app level (over the linux kernel)

For us, the solution of adding a RS232/RS485 converter is not possible because of the hardware.

Regards

Alvaro

[Yuri]

Hello,

   Generally TXDC (Transmitter Complete) bit of UARTx_USR2 register can be used.

Have a great day,

Yuri

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[agamarramu]

Hello,

Thanks for the answer but it's a bit incomplete, maybe my message wasn't clear. I need to know how to read that bit from the application level. We are using a linux kernel and we don't know how to access those bits. Can you explain how to do that, please?