PIC 18F4550 USB to comm using CDC problems

[ianomaley]

18f4550 usb

Helo all,

We are currently in a project involving data aquisition to a PC with the PIC 18F4550.
Data is send to the PC via USB port but PC must see a virtual comm port. Microchip offers standard library, CDC for doing so. Standard Windows driver is also used.

A simple program (just periodically send fixed data to the PC) works fine, but in a few seconds (randomly) packets are no more received.

I will apreciate a lot, if someone can provide me information on proper use of CDC or any other virtual comm port generation with USB-PIC; that is sample programs (are no being provided by microchip), known bugs, etc.

Thanks a lot for your time

Ian

 

[Geri]

microchip cdc driver

Hello ianomaley

Instead of the CDC driver I do my programming directly by using a USBAPI. Just have a look on this thread. Here I uploaded an example how to use it.

I works very fine!

Regarding the CDC-driver. Maybe try to check if your PC-port is a USB 2.0 port. I had problems using USB 1.1 ports

Best regards

Geri

 

[yousafzai]

cdc microchip

you can try hidmaker FS for ready made code both for the micro and the host pc.

 

[sphinxvnn]

pic18f4550 cdc

USB Interface Microchip PIC18F4550 with CDC library.

This example demonstration how to use USB PIC18F4550 with CDC library.
Link: http://www.sixca.com/eng/articles/usb_cdc/index.html

 

[cloudland]

18f4550 cdc

Ian , i intend to do a data acquisition project using PIC18F4550 also , may i noe how u construct for the circuit and how the computer can detect it when the usb is connect to comp port ? cdc is a compulsary ? I am js start learning it and totally lost of idea. U using wat language ?
Do u hav any info can provide to me ?
thanks a lot if u can help me .