CH348 USB – Octal USB GPIO Registers

[For The Popcorn]

This is a long shot...

I used a CH348 to create a USB – 4 RS232 + 4 UART interface(link to darasheet). I used the GPIO pins to control 3.3v/5v operation of the UART ports (supply voltage and I/O level). I made a poor assumption that the I/O pins could be configured in the USB driver.

Such is not the case, but the manufacturer did supply a demo program in C# that allows configuration and control of the GPIO pins. But no source code or documentation about the registers. I've asked for documentation but it was already the weekend in China when I did so.

I'm wondering if anybody here is familiar with the inner workings of this pretty neat cheap. My terminal emulator only supports up to 230,400 baud which works great.

Thanks,

Jon

The pictures show the board and front and back panels, supported by Lego Technic frames. I haven't laser-cut the panels to complete the enclosure yet.

 

[rjenkinsgb]

Anything useful in this? It looks to have some definitions for I/O registers around 0x97 - 9C:

ch348/ch348.c at main · xdarklight/ch348

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github.com

 

[For The Popcorn]

That's more than I found. But it's kind of beyond my understanding.

From the demo program, there are registers for:

RS232 control / GPIO
Enable
I/O direction
Data


Thank you.