Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Uart loopback

Hello guys, I have created a nios2 system with a uart port: uart_0 I have put the rx_uart and tx_uart in short circuit. So I expect that what I send is what I get. Finally I have writ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

A few possibilities:

  1. If you are using an RS232 converter, it probably can't operate above a few hundred KHz. Make sure you're looking at the input to the RS232 converter.

  2. Go into the assignment tool and verify that the txd_uart signal (or the clock signal) is routed to the correct FPGA pin.

  3. Possibly check other pin assignments as well.

  4. Check to make sure you have a clock!

  5. Search and make sure that the txd_uart signal isn't routed to multiple places (some languages allow this).

  6. Check to see if the FPGA really loaded?