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Altera_Forum's avatar
Altera_Forum
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15 years ago

JTAG USB dropping data when printing to terminal

I've got a system setup to print out ADC samples via a NIOS processor (standard) and JTAG USB. The ADC samples at 48Khz and the samples are streamed to the NIOS processor to be printed through PIO. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

The thing is that writing to the JTAG UART takes some time, especially once the hardware buffer is full, and the driver needs to wait until there is room again to write. You don't see that when you do a loop because the driver is configured to wait.

What could happen in your case is that the software misses some samples because it is waiting in the JTAG UART driver.