USBDemo, something to learn USB a little bit

[mister_e]

1st, there is a typing error in your example USBDemo.pbp source file. Line 39 in your file should say "_FCMEM_OFF_1H" and not "_FCMEN_OFF_1H", i.e. the letter N should read M.

Yes and no, it have been discussed before, it's down to your MPASM version. The latest version use FCMEN, while older use FCMEM
http://www.picbasic.co.uk/forum/show...t=3251&page=30 Post 149 and +

3nd, you are redefining the PIC CONFIG register and this is also done in the so called INC file from Melabs for that PIC. This generates errors and the user has to choose where to configure these registers to avoid duplication of definition.

Yes, you are right, but it's usual to comment the default one. At least, i always do it. see bellow..
http://www.picbasic.co.uk/forum/showthread.php?t=543 Post 5 and +++

[mpardinho]

Mister E,
the code work,
but AN0 and AN1 not stable
leds not stable off....same time is on or off....+- 5 seconds...push-buttons is off
than push-button = on, led stable ......on...off

i use 18F4550
470 nf in Vusb / Vss
.1 uf ceramic in Vcc/Vss
4k7 in MCLR / Vcc
resonator 4mhz


* pardom for my english

[skimask]

Mister E,
the code work,
but AN0 and AN1 not stable
leds not stable off....same time is on or off....+- 5 seconds...push-buttons is off
than push-button = on, led stable ......on...off

i use 18F4550
470 nf in Vusb / Vss
.1 uf ceramic in Vcc/Vss
4k7 in MCLR / Vcc
resonator 4mhz


* pardom for my english

You unstable just like the other post in the Communications->USB section?

[mpardinho]

yes, but i make the mr.e code and circuit to test
....and ...not stable too...i think my 5v from pc is not good

pardon for the same question.

[Noise.be]

i use 18F4550
470 nf in Vusb / Vss
.1 uf ceramic in Vcc/Vss
4k7 in MCLR / Vcc
resonator 4mhz

I've used
220nF Vusb / Vss
.1 uF ceramic too
10k MCLR/Vcc
USB B type Connector
and it works fine now ;-)

[mister_e]

Out of curiosity... Anyone tried USBDemo with Windows Vista? Working?

[Squibcakes]

No, but I'll give it a go this weekend I can feel a backup coming on....

BTW,

I need a decent way to debounce a number of switch's connected to my pic.
I'm using a dirty PAUSE 50 to do just that, but finding unless I put USBSERVICE everywhere (ie after checking the status of each switch), the switch's arent being sent to the pc (via usb).

I borrowed the ASM timer interrupts from the usbdemo code, but that doesnt help either. I'm thinking that TMR interrupts aren't independent of PAUSE statements. Is this true?

I don't want to use the BUTTON command.

cheers
Squib

[mister_e]

If you're using ON INTERRUPT... yes PAUSE will screw up things. Using Darrel's interrupt + it's USBDemo code modification ( AKA POST 148), should solve it.
http://www.picbasic.co.uk/forum/show...&postcount=148

Depending how you implemented the interrupt debounce/read plah plah, it may work as well with ON INTERRUPT..

[Squibcakes]

Ok Great I'll have to try it. Good to know there could be a work around.

BTW I tried running usbdemo on Vista, but I need the mchid.dll, which I have on floppy disk but can't get it on to the laptop running vista.

Don't supose you can upload it on to the website so I can download it straight onto my laptop eh?

Cheers
squib

[Squibcakes]

If you're using ON INTERRUPT... yes PAUSE will screw up things. Using Darrel's interrupt + it's USBDemo code modification ( AKA POST 148), should solve it.
http://www.picbasic.co.uk/forum/show...&postcount=148

Depending how you implemented the interrupt debounce/read plah plah, it may work as well with ON INTERRUPT..

Hi Steve,

Thanks for the tip, it works a treat!

I rekkon melabs should incorporate DTs instant interrupts into their next version of pbp and do away with ON INTERRUPT altogether......

Cheers buddy.

Squib