Simple Maths Going Wrong

[jellis00]

If you use USB as CDC, it looks just like a COM port to the PC.

You should be able to convert any SEROUT's to ARRAYWRITE's, then send the array out USB to StampPlot.

Or you can send CSV text using CDC and capture it to a file with HyperTerminal.
Then import to excel.

Thanks for your input Darrel. Unfortunately the reason I need to use a USB interface is the the user of this only has a laptop that doesn't have a serial port....only USB port. If I did it as a USB CDC on the PIC side, wouldn't he have to use one of the USB to Serial adaptor cables....which I know from experience don't always work that well.

I did Google an article on CDC since I didn't know anything about CDC that says it "...describes the Microchip PIC32 USB CDC serial driver and acts as a programmer's guide for developers wishing to adapt it to their own application." However, I am using 18F2550/4550 chips so don't know whether that would apply.

It took me a few weeks to understand your adaptation of Mister-E's HID with your DT-HID/USB interface well enough to even get it to work....and although I have fairly well mastered the PIC side of the USB interface, the VB6 HID side is still pretty much a mystery to me. So I am looking for an easier way to do the PC side of a USB interface if that is possible??? StampPlot looked like such an approach, but if I can't use USB with it I guess I have to pass on it.

[Acetronics2]

Hi, Darrel

Using ARRAYWRITE for such uses causes me some trouble when using STR\n ...

as Manual states on p.54

The length is determined by the count ,less than 256 OR when a "0" is encountered in the string

quite annoying for sending numbers as strings ... as you can see it in the DT_USB Demo you showed us i.e. . ( in the right window, strange numbers appear ... )

do you have a fix or turnaround for that ???

Alain

[mackrackit]

http://www.picbasic.co.uk/forum/showthread.php?t=5806
Might help you out. The PC will see the USB connection as a virtual serial port.

[Darrel Taylor]

Thanks for your input Darrel. Unfortunately the reason I need to use a USB interface is the the user of this only has a laptop that doesn't have a serial port....only USB port. If I did it as a USB CDC on the PIC side, wouldn't he have to use one of the USB to Serial adaptor cables....which I know from experience don't always work that well.

No, not at all.
You connect it to the PC's USB bus, just like you would with HID.
But to the PC it looks like a COM port. So just about any PC program that works with RS232 will work with USB.

Squibcakes started this thread on CDC ...
USB CDC Communications for Dummies!
http://www.picbasic.co.uk/forum/showthread.php?t=5806

I added an update for 2.60 with a servicing routine ...
http://www.picbasic.co.uk/forum/show...0301#post80301

The USB_ASM_SERVICE isn't compatible with DT_INTS, but the handler is, so it will be easy to modify, since I already know you're using them.