fast serialUSB read

[sined23]

Hi guys! I increased serialUSB read speed from 1Mbit/s up to 12Mbit/s.
Details are here http://forum.arduino.cc/index.php?topic=391757.0
I suggest you to take it for new arduino version.

[facchinm]

Hi @sined23 ,
would you mind opening a proper PR ? So we can review easily 😄

[sined23]

Sorry, I don't know how to do it. You can review these new libraries and compare with existing
http://forum.arduino.cc/index.php?action=dlattach;topic=391757.0;attach=163027

[sined23]

if you have questions for changes pls ask

[sined23]

The main idea is that bytes are written and read into/from CDC buffer not one by one but block of bytes

[sined23]

Serial_::accept write into CDC buffer as maximum as possible (only to not overflow the buffer)
Serial_::readb (you can change just read, not use readb) get from CDC buffer as maximum as possible or nessasary length

and one more important thing: in USBD_Recv "while (n--) *dst++ = UDD_Recv8(ep & 0xF);" should be replaced into UDD_Recv(ep & 0xF, dst, len);

[sined23]

after that read speed is incredible increases !!!

[NicoHood]

Fork the repo, do the changes, upload and open a pr. Its very simple, just learn some basic git commands (clone, add, commit, push).

[sined23]

created PR

[sined23]

Hi guys! Do you plan to merge this PR?
arduino/Arduino#4871

[iddq]

merged?