Objective Development Forums

I have received from OBDEV expert a correct answer for my original problem as follows: ( ) >> >>This behavior does not surprise me, since the SOF detection does not actually >> trigger on SOF but rather on malformed sync patterns. >> If we see an edge, but can't detect a valid sync pattern, we assum...

http://vusb.wikidot.com/project:lc-meter-usb
See the macro myUSB_SOF_HOOK in the usbconfig.h file in the "LC_meter_USB_Atmel" folder.

I summarize the problem again: - Since the USB host sends Start-Of_Frame (SOF) packet to the device in every 1ms, I want to detect the arriving of SOF packets to the device. I thought, there is only one SOF packet in each 1ms time interval, but using the SOF detection capability of the V_USB softwar...

Using an USB_SOF_HOOK macro (only one instruction: sbi PINB,1 ) in order to toggle PB1 for testing SOF detection, instead of getting a square wave signal on output pin 1, a narrow pulse appears in every 1 ms. The pulse width is less then 100us. Actually it is around 5us. Can the USB driver of the de...