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Altera_Forum
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20 years ago

Multiple serial port misbehavior

Quartus 4.1, Nios1.01: The NiosII system has 2 uarts, a primary debug terminal@115K baud, and a secondary half-duplex slave device@19.2K baud. During operation lots of printf output (from ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

Fixed it.

The problem was accessing using the same r/w file ptr from two different async tasks. Incomming data was getting mixed with outgoing data within the low-level file management block. Fischer's suggestion of opening the file twice seems to be the cleanest solution. With fread(),fwrite(), no further exclusion or synchronization appears needed.