USBDemo, something to learn USB a little bit

[selimkara]

Thanks for your rapid response and interest. We are working in Physics dept. at Trakya University. Our aim is to control some experimental structures (for example temperature, light intensity...). To do so, we need a less complex and short VB6 procedure. I think using virtual comm port is very useful to do this. Am I wrong? We had succeeded similar connection, using CDC via MSCOMM in VB6 with a short code. But in pic side, we could not set interrupts. Your code(pic) is very useful and simple. So we want to use your pic code and change your VB code to adapt MSCOMM (virtual comport). You may ask why we don't use serial comm.because there's no comm port on new laptops, so we must learn to use USB.
If I'm not misunderstand, in the following conversation (#36) between you and Squibcakes, Squib reported that he succeeded this. I would like to know how? I think some changes must be made at pic code. If you or squib have tips about this or have complete codes, I'd be grateful. Thanks for your previous suggestions. We'll also utilize them.

sincerely
Selim

#36---------------------------------------------------
Mr_E
Yeah ok well thanks for your input anyway - always welcome I'm happy to edit the the .inc file and leave it at that.

Great news! I finally got the CDC virtual comport working!!!!!!

Now I can send data via USB (virtual comport) and out of the Pic 18F4550 USART! and vice versa!
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I'm stoked that this actually works!

Squib

[Squibcakes]

T
If I'm not misunderstand, in the following conversation (#36) between you and Squibcakes, Squib reported that he succeeded this. I would like to know how? I think some changes must be made at pic code. If you or squib have tips about this or have complete codes, I'd be grateful. Thanks for your previous suggestions. We'll also utilize them.

The post was regarding setting the config fuses by way of changing the 18f4550.inc file.
I never actually used CDC with the USB demo, totally separate and apart

As Steve said, you don't need to use CDC to send you data back to the PC. This code uses HID interface and the VB program displays the data coming from the PIC.

As far as VB is concerned I have no clue - One day I should learn it!

Squib

[Darrel Taylor]

Selim,

Maybe I missed something in the conversation,
But this might be what you're looking for ...

USB CDC Communications for Dummies! (Squibcakes)
http://www.picbasic.co.uk/forum/showthread.php?t=5806
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[selimkara]

Ok. Thanks everybody. I think that was a stupid idea. I'll use and develop UsbDemo. Thanks Steve, Darrell and Squib.

Bye

[Josuetas]

Hi.

To Mister_E or anyone that really understand this (i clearly don´t). I made this post already but none seemed to understand it, so i am posting again in other words.

I made this software that controls an USB device, it all began with Mister_E`s demo, it is working really fine now, no problems with it. NOW i want to use two devices, same software!. Lets say this is a temperature sensor, now i want to measure two diferent points so i wan´t to connect two diferent sensors. HOW can i differentiate both devices? when i connect the second one the first connected gets useless (I am sure the handler is replaced).

I´ve been reading the whole code for Visual Basic and PBP, i don´t intend to change my device ID and Product ID.. this would be useless. Does the Driver easyHID only works with one device?

Please give me a little advice on this matter.. How can i use two different handlers?

Thanks

DJC

[mister_e]

2 different ways
1) assign, then read the device serial number -> this has to work
2) use a specific data byte in DataToSend as identifier -> not 100% sure of it

[Josuetas]

Hi.. thanks for your reply Mister_E.

I have this problem with both solutions!... i dont have two working devices when i connect them... i just have one! When i connect the second one the first connected doesn´t work!
My guess is that this happens because the handler of the first connected device is lost and replaced for the second one.. hence my sent data (from pc to device) is just received in one of the ports (this is for sure!) so it wouldn´t work to use the serial number because i can´t even get it :s.

The same reason for the second choice.

I also think that both devices could have exactly the same software, my guess is that this is a matter of software (in VB), there should be a way to create two different connections (what i call handlers) but i don´t get where this is done in the code Sub ConnectHID().

Again maybe i am thinking this wrong but this is what you would do with two diferent serial devices in different serial ports, you would have two different interrupt routines in the VB software to control each one.

I really hope someone could guide me here, has none connected two devices?

Thanks again for your time and concern,

DJC