HP Prime too complicated

[ijabbott]

(07-16-2018 10:33 AM)DrD Wrote:  

(07-16-2018 06:53 AM)cyrille de brébisson Wrote:  Hello,

Serial coms are "easy". Send bytes, receive bytes...

USB is complex!



Now, if one of you here is working for a company that makes/use such a device and have a real use for such USB functions (more than just: it would be cool to show that you can do it), then please do PM me and I can see if something could be arranged...

Cyrille

USB to serial converters exist, so if you could get an interface like that to work, you would be well along the way to success with the comm's.

Even for USB serial devices, there are quite a few different types (FTDI, Prolific, Silicon Labs, WInChipHead, to name a few) each with their own protocols for embedding data, line control and status information into USB packets. There are some devices that use standard USB serial device protocols such as USB CDC to appear as some sort of "modem", but the common ones I listed don't. It all gets very complicated!