PIC18f4550 interface usb not recognized

W

winson1224

New Member

• Jul 30, 2013

• #1

I'm currently doing some example online for PIC18f4550. Everything was ok until i programmed the PIC and plug in the usb port to PC, error 'USB not recognize' was showed. How can i solve this problem?

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Jul 30, 2013

• #2

Which example?? You'll need the driver... It comes in the Microchip libraries.. **broken link removed**

Also ensure your USB A and B signals are the correct way round....

 

JonSea

Well-Known Member

Most Helpful Member

• Jul 30, 2013

• #3

You also need a cap from Vusb to ground on the PIC. I think the data sheet only mentions this in a footnote! I have one of Microchip's demo boards with an 18f2550 where THEY forgot this little detail and the board wouldn't communicate without it.

I think 0.47 μF is the usual choice but the value isn't critical.

 

W

winson1224

New Member

• Jul 30, 2013

• #4

Thx for your reply..i tried many examples..but all end up still got this error..i downloaded and installed the libraries also..do u have any other succeed example?

 

W

winson1224

New Member

• Jul 30, 2013

• #5

i used 0.22uF cap..is it because of this?

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Jul 30, 2013

• #6

winson1224 said:

Thx for your reply..i tried many examples..but all end up still got this error..i downloaded and installed the libraries also..do u have any other succeed example?

Click to expand...

You need to install the driver when the libraries are installed... its a separate thing..

 

W

winson1224

New Member

• Jul 30, 2013

• #7

which file need to be installed?

 

Ian Rogers

User Extraordinaire

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Most Helpful Member

• Jul 30, 2013

• #8

Once the Microchip library is installed... go here C:\Microchip Solutions\Microchip\USB.

There are 10 different driver types for the microchip USB devices... There is also a documentation folder so you can find out which one you need...

 

T

Tej_p

New Member

• Apr 30, 2020

• #9

Hi sir..
I read your post regrading the USB interface with PIC ...I hope your completed that project
Can you help for doing USB interface with pic18f4550..
please sir.
can share the sample project and code

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• May 1, 2020

• #10

Please note the date... 7 years ago... I doubt we'll see him again... Last seen Aug 2013

I'm shutting the thread.