Re: Interrupt driven UART

On Thu, 12 Oct 2006 04:53:04 -0400, CBFalconer <cbfalconer@xxxxxxxxx>
wrote:

The OP will also need to implement some sort of critical section in
either case. I imagine this will be most easily implmented by
controlling the interrupt enable.

Not really.

The two error situations with a ring buffer without critical section
is that you get a premature "buffer full" when writing to the buffer,
when there actually was one free byte in buffer (=extend the buffer by
one byte) or you get "buffer empty", when actually one more byte would
be available (=in a polling system read the byte at next poll).

This is valid for buffers less than 256 bytes for 8 bit data bus
systems and 64 KiB buffers in 16 bit data bus systems.

Paul

.

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