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Altera_Forum
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21 years ago

Altera Avalon Uart performance problem

I have been testing the Altera Avalon Uart by sending data to it from a different machine. A program on the other machine sends 16kB of known data out its serial port which connects to the serial ...
Altera_Forum's avatar
Altera_Forum
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21 years ago

I have begun to use SignalTap II in order to try and diagnose the Uart problem.

I would also like to try to use the JTAG uart "/dev/ttyJ0" to see how it performs as a reference point.

The problem with this is that I haven't figured out how to send data from Cygwin across the Jtag connection.

I tried the following with no success:

echo "hello" > nios2-terminal

cat textfile > nios2-terminal

On the Nios II side, I'm just running "cat /dev/ttyJ0". This works fine if I run nios2-terminal and manually enter data.

Anymore suggestions on how to send external data through the JTAG uart connection under Cygwin?

I would also like to try the Opencores uart16550 to see if it has FIFO problems. This wouldn't work for our end solution, because it takes a lot more LE's compared to the NIOS uarts. But, it would allow a good comparison. Has anyone converted this to interface with an Avalon bus?