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dkim37's avatar
dkim37
Icon for New Contributor rankNew Contributor
7 years ago

How can I use the loan I/O?

Hello I am new to fpga.

I try to use uart for send data to pc.

I use de1-soc and there are two part FPGA and HPS.

According to my understanding, UART is connect with HPS, so I should borrow the pin use loan IO.

In the back, I attached a picture of how I did it.

​

​First I only use tx, so I activated loan io 62.

and export loan io

​

and make this code (loan io oe 62 <=1 (out) / loan io out 62 <= uart_txd

​It is my top level. I have another code for uart

​

Compile is completed but uart is not working.

Please advise for me. what is wrong. and how to use loan I/O

Thanks a lot.

4 Replies

  • VROGE2's avatar
    VROGE2
    Icon for Occasional Contributor rankOccasional Contributor
    6 years ago

    Did you ever figure this out? I am also trying to use the UART on a cyclone V SoC using LoanIO but I am having some troubles.

    • dkim37's avatar
      dkim37
      Icon for New Contributor rankNew Contributor
      6 years ago

      We haven't solved your problem yet.

      I contacted a local Intel company but did not receive an accurate response.

      Please let me know if you can solve it.

      We are just buying uart-gpio and using it.

      • VROGE2's avatar
        VROGE2
        Icon for Occasional Contributor rankOccasional Contributor
        6 years ago

        Upon a second look at your code I noticed that you're using LoanIO 62. From some of the other research I have done on this subject I believe that you have to use LoanIO 50 as the TX. I could be completely wrong but it might be something that would be worth a shot. The UART-GPIO may be the way to go for me as well if I can't get mine to work either so let me know how that goes.

  • TSche18's avatar
    TSche18
    Icon for New Contributor rankNew Contributor
    6 years ago

    Anybody something new? Have the same problem since...I don't know when, but nothing helps