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Altera_Forum's avatar
Altera_Forum
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9 years ago

Cyclone V Soc Development kit UART signal on GPIO pins

HI, I am writing serial driver for cyclone V. UART0 is working perfectly when I connect it to PC using the USB connector for serial (J8). But if I try to get output through J9 which are GPIOs for the same UART, I don't receive anything on teraterm but what I send from teraterm is received correctly in the controller. Same thing is happening with UART1. I ensured the TX pin is working fine by connecting the TX and RX pin in loopback and making sure that what is send is correctly received.

So to conclude

1. TX pin is configured correctly

2. Baud rate and other settings are fine

but no output is shown on teraterm

If anyone can help, I would be very grateful.

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    9 years ago

    How it Teraterm connected to J9?

    Is it through a standard DB-9 or DB-25 RS-232 connector?

    It that's the case, the voltage & polarity are not the same: a level conversion chip is needed.

    Regards