Experimental buffered transmits for cdcacm.c

(3 posts) (2 voices)

mlundinse
Member

I have written some code that bufferes serial writes while the previous package is
being transmitted. For a quick succesion of fairly small writes this can boost
USB serial throughput from about 1.2Mb/s to 4.8Mb/s when writing to and displaing data in a serial console on a Mac.

https://github.com/mlu/libmaple/blob/master/libmaple/usb/stm32f1/usb_cdcacm.c

It has been tested and seems stable so far.

Regards
Magnus

Posted 2 years ago #
gbulmer
Moderator

mlundinse - "For a quick succesion of fairly small writes this can boost USB serial throughput from about 1.2Mb/s to 4.8Mb/s ..."

Brilliant!
4x, is a huge improvement.
Very well done, and thank you for sharing.

Have you run any tests on full-USB-packet speed?

Posted 2 years ago #
mlundinse
Member

I will do more tests, it should also be interesting to check how this affects the time that the Maple is wasting while waiting for a free USB transmit buffer. In many cases that might be more interesting than maximum throughput.

Posted 2 years ago #

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