usart tx ring buffers? « LeafLabs Garden

usart tx ring buffers?

(3 posts) (2 voices)

Mike McCauley
Member

Hi,
The current implementation of usarts in libmaple git master has an interrupt driven ring buffer for receive, but a busy-wait loop for transmits. It works, but performance is poor (CPU is blocked while tx buffer is not empty)

Does anyone else like me think the transmit side should also have a ring buffer and be interrupt driven? Im happy to implement it, but will the developers accept my pull request?

Cheers.

Posted 2 years ago #
mlundinse
Member

Its a good idea, but I would also look into the possibility of using DMA, then
the interrupt must only be serviced at the end of a DMA buffer and not for every transmitted character.

Posted 2 years ago #
Mike McCauley
Member

OK, I have some nice working code now, pushed to git@github.com:mikemccauley/libmaple.git

Posted 2 years ago #

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