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PIC 18f4550 problems ................

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kpvlpp

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i m doing a project on USB HID device using PIC18f4550. the connections seems to be perfect. but when connected i see this msg "usb device not recognised" . i checked for driver to reinstall it. it says "no need of drivers or no driver is found" what does this mean?

m really confused. pls help me guys. if u can help with hardware schematics pls................
 

FoxyRick

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It most likely means that the software on the MCU is not configuring the USB (on the MCU side) correctly; probably not sending the correct HID initialisation strings.

It's easiest to start by loading one of the simple example programs from Microchip (like an HID keyboard emulator), to see how it works.

https://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2680&dDocName=en537044

Note also that your program needs to continually call a USB 'keep-alive' function, every 10ms I think, otherwise the PC will lose the connection. You'll see this function in the main loop in Microchip's examples.
 

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