USBDemo, something to learn USB a little bit

[mister_e]

Atwoz, only USB PIC will work!

[atwoz]

Ok Thanks Steve! Looks like I will have to buy some 18f4550 .

[mister_e]

Well, one in the list... 18F4550, 2550,2455, 4455 they all works.

As you'll see, it's fun to have it's first working USB project....even if you're aware of post #7 and #8

[kiwipiper]

Hopefully this Topic is still alive as I am really keen to do some experimenting with USB.

I have looked at all the posts and haven't found any refering to my problem.

I am using the 18F4550 pic, Picbasic Pro 2.50 and MicroCode Studio Plus 3.0.0.5

When I compile it stops on Line 81

Line 81: UCFG var byte EXT ' include UCFG register... Yeah Melabs didn't (
Line 82: ucfg = %00010100 ' enable internal USB pull-up, Full speed USB

With the following Error Message:

ERROR Line 81: Redefinition of VAR. (USBDemo.pbp)

I notice that when I paste the code from mister-e's zip file into MicroCode Studio it changes the case of line 82:

Line 81: UCFG var byte EXT ' include UCFG register... Yeah Melabs didn't (
Line 82: UCFG = %00010100 ' enable internal USB pull-up, Full speed USB

the ucfg is now in Capitals, I don't know if this has anything to do with it?

[Darrel Taylor]

Previous versions of PBP didn't have the UCFG register defined in the include files. And usbdemo was written at that time.

PBP 2.50 does have the UCFG register, so defining it in the main program causes a "re-definition" error.

Just comment out the UCFG var byte EXT line and the error should go away.

hth,

[kiwipiper]

I am using the 18F4550 pic, Picbasic Pro 2.50 and MicroCode Studio Plus 3.0.0.5

When I compile it gives the following errors.

Error[118] c:\progr~1\mecani~1\mcs\usbdemo.asm 87 : Overwriting previous address contents (0000)
Error[118] c:\progr~1\mecani~1\mcs\usbdemo.asm 87 : Overwriting previous address contents (0001)
Error[118] c:\progr~1\mecani~1\mcs\usbdemo.asm 93 : Overwriting previous address contents (0000)
Error[118] c:\progr~1\mecani~1\mcs\usbdemo.asm 93 : Overwriting previous address contents (0001)
Error[118] c:\progr~1\mecani~1\mcs\usbdemo.asm 98 : Overwriting previous address contents (0002)
Error[118] c:\progr~1\mecani~1\mcs\usbdemo.asm 98 : Overwriting previous address contents (0003)
Error[118] c:\progr~1\mecani~1\mcs\usbdemo.asm 99 : Overwriting previous address contents (0004)
Error[118] c:\progr~1\mecani~1\mcs\usbdemo.asm 99 : Overwriting previous address contents (0005)
Error[118] c:\progr~1\mecani~1\mcs\usbdemo.asm 100 : Overwriting previous address contents (0006)
Error[118] c:\progr~1\mecani~1\mcs\usbdemo.asm 100 : Overwriting previous address contents (0007)

Are these errors anything to be concerned with?

Also out of interest, I am using a 4Mhz Resonator but in the code it is: DEFINE OSC 48

What is that about?

However, I seem to be making progress because when I plug it into the USB of the computer. I get the message found new hardware "USB Demo" but then it gives a message There were problems ........ etc etc.

The VB Application is not picking it up yet.

[Darrel Taylor]

When I compile it gives the following errors.

Error[118] c:\progr~1\mecani~1\mcs\usbdemo.asm 87 : Overwriting previous address contents (0000)
...

What to do if i get "overwriting previous address content" error message?
http://www.picbasic.co.uk/forum/showthread.php?p=6775

Also out of interest, I am using a 4Mhz Resonator but in the code it is: DEFINE OSC 48

What is that about?

The 18F/USB PIC's have an amazing oscillator/PLL structure.

With the proper CONFIG settings, You can use any crystal that's a multiple of 4mhz (4,8,12,16,20) and still have a system clock of 48mhz.

If the timing doesn't work well with your program, you can also have 48mhz going to the USB module, and 4/8/12/16/20/24/32 mhz going to the system clock.

It all depends on the CONFIG's.
<br>

[semiuniversal]

Hi mister_e & all who have contributed. I am quite new to PBP and this is my first post to this list. I just found this demo a week ago, read the thread, ordered the parts, assembled a proto board on Saturday and - (insert Windows USB Device da-dink! sound) it worked FLAWLESSLY, the first time. I am either lucky standing on the shoulders of giants - but oh, my, what a good feeling.

I have been tinkering incessantly since then.
Thank you for giving me super powers.

[skimask]

Hi mister_e & all who have contributed. I am quite new to PBP and this is my first post to this list. I just found this demo a week ago, read the thread, ordered the parts, assembled a proto board on Saturday and - (insert Windows USB Device da-dink! sound) it worked FLAWLESSLY, the first time. I am either lucky standing on the shoulders of giants - but oh, my, what a good feeling.

I have been tinkering incessantly since then.
Thank you for giving me super powers.

Take my advice...Give out while you still can...
I have lost countless hours of sleep playing with USB and that demo, spent untold amounts of money, not to mention ticked off the wife numerous times...

Seriously though...Good game...
I wish other Noobs would take that as an example...especially the part about 'reading the thread'....

[mister_e]

NOTE: If your going to use LONG variables, you MUST copy the PIC18Xxxxx.BAL file in your source directory as well, unless you'll receive some compilation errors.

The .BAL file is located in \PBP\USB18 directory.

If you're using PIC18F4550, you MUST copy the 18F4550.BAL file in your source code directory.

@Darrel.. is this possible to paste it in the first post as well as the other source code (or link) for the other PICs (post 99 http://www.picbasic.co.uk/forum/show...8&postcount=99) ?

[Darrel Taylor]

Done! &nbsp;

[skimask]

Done! &nbsp;

$20 says a dozen people miss the 18Fxxxx.BAL note...