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MAX3232 RS232 PMOD MIO connection

nick0559

Hi All;

I was hoping to open a second UART link on the Zedboard using the MAX3232 PMOD however I have ran into a small problem.

On Zed board the MIO PMOD socket is wired with MIO10 connected to MIO PMOD pin JE2 and MIO11 connected to MIO PMOD pin JE3.  JE2 on the MAX3232 is PMOD Socket Pin 2 and JE3 is PMOD socket pin 3.

Now for the difficulty, PMOD Socket pin 2 is TX on the MAX3232, unfortunately MIO10 is RX.  Also to complete the inversion PMOD Socket pin 3 is RX and that is connected to MIO11 which of course is TX.

How best to fix this?

I think need a Null modem, unless there is a way in the SDK to force an inversion on the pin function.  I do not see an way to do an inversion in IPI.

Does anyone have the easy fix?

Thanks
Nick

  • 0

    Hi Nick,

     

    If you can use one of the four 'PL' based PMOD sockets on the Zedboard you can just route the UART 0 signals out via EMIO and connect them to the PMOD socket in the PL. I have done this with the MAX3232 PMOD with no issues. One thing to watch out for if you do enable UART 0 is that, at least for the SDK auto generated applications like "Hello World" and the Test Peripheral application, UART 0 will become the default console and the stdin/stdout data will be on the UART connected via the PMOD - not UART 1 on the USB - UART.

     

    -Gary