USBSERVICE + serout2 problem

[mackrackit]

Darrel has been out of town. He is sorta back now so maybe he will be able to help now.

[aberco]

Ok, I tried some debug attempt with some LED blink, which show me that the interrupt handler "DoUSBSERVICE" within Darrel's routine is not called.

This is what should do the USBSERVICE. Is there something to do to link this handler to an interrupt? should I configure a timer for this? I have deactivated the watchdog timer if that could explain why the handler is not working...
I do not understand what triggers this interrupt. I've tried to call it manually within the USBIN loop using a GOSUB, but that does not help getting the PIC to enumerate...

[Darrel Taylor]

Aberco,

Sorry, I deleted your modification because it was silly to use Timer0 for USB interrupts, and it won't detect Plugged, RX, or TX, that way.
Plus I don't want that code floating around.
Some Patience is required until I get settled. I don't have any computers or internet access at night right now.

I believe that all you need to do is change the USBIE and USBIF bits because Microchip moved them in the 13K50/14K50.
They used to be PIE2.5 and PIR2.5 in the 4550 family. Now they are PIE2.2 and PIR2.2 in those chips.

Please download the file again to start from scratch, then change to ...

USBIE              VAR PIE2.2        ; USB funnel Interrupt Enable
USBIF              VAR PIR2.2        ; USB Interrupt Flag

[aberco]

Simple enough, and worked great!

May I ask what drives the USBSERVICE interrupt?
Also I would like to use DT_INTS-18.bas in the program as well but I don't understand how to use the interrupt hook handler, and could not find any example of it.

Take your time, there's no hurry, I can now spend some time to play with USB data transmission

Thanks a lot for the great help.

[aberco]

Or... is there a way to turn DT_HID260 into a DT_CDC260? is there something I could use in the cdc_desc.bas file (contained in the USB demo folder) to do such thing or is it more complicated than transferring a series of values?

[Darrel Taylor]

> May I ask what drives the USBSERVICE interrupt?
The USB module itself generates many different interrupts.

> Also I would like to use DT_INTS-18.bas in the program as well
> but I don't understand how to use the interrupt hook handler,
> and could not find any example of it.
That is not possible with USB_ASM_Service.pbp.
All interrupts used with the "Hook" can only be ASM (assembly language) type interrupts.

> Or... is there a way to turn DT_HID260 into a DT_CDC260?
No, but I could write a DT_CDC program. If I ever get my computers and internet access at home.

[aberco]

Ok, that was my understanding of the interrupt hook handler. Hmmm that will make things more difficult. A DT_CDC would be extremely helpful in my case, but that is a lot to ask...

I will think about it, currently I have two different application, both that need to use the CDC profile (HID could work, but that would make programming more difficult on the computer side... also it is nice to use a terminal to drive the device without any dedicated software).
One application needs Timer1 to do precise timing sampling, the second needs your multiple software PWM routine to drive 3 LEDs.