Objective Development Forums

A user of AVRminiProg give me a picture about the USB signal. He test the AVRUSB unstable on his PC. http://www.SimonQian.com/image/temp/HPIM7716_small.jpg By my side: http://www.SimonQian.com/image/temp/usb.jpg And it's muuuuuch better. Will it solved by increasing the resistor between USB and AVR?

OK. My code is somewhat ugly.
But will the similar error occur when sending data to PC?

So you mean set the trigger position to where?
It's 10% by default, so there is 10% data before trigger and 90% after.

I remove other USB devices, and do the test.
It never stops when sending data to PC.

new logged USB data:
http://www.SimonQian.com/download/temp/USB.zla

There is a DATA package before trig falls.
If there is not enough information, It's easy to take anther try at 10MHz.

http://www.simonqian.com/download/temp/USBD-.zla http://www.simonqian.com/download/temp/gui.JPG The software can be downloaded at: http://www.embedtools.com/download/downs.asp?ID=1842 trig is the signal I raise to indicate the error, on the fall edge, my analizer start working usb is USB D- signal,...

I'll be free these days.
My Logical Anaylizer is 2K in storage deepth.
Is it enought?
I'll make a signal to tell my anaylizer to start when I detect a failure.

I'm busy with a STM32 chip these days.
I'll try when I have time.

It's OK after I only store the DATA token when ACK is sent: handleData: mov x3, token lds token, usbCurrentTok;[18] tst token ;[20] breq doReturn ;[21] lds x2, usbRxLen ;[22] tst x2 ;[24] brne sendNakAndReti ;[25] ; 2006-03-11: The following two lines fix a problem where the device was not ; recogni...

Code for usbFunctionWriteOut: /// Token recorded when receive DATA package uchar lastTok; /// /// @brief AVRUSB will call this function when DATA package is received /// @param data received data to process /// @param len received data length /// void usbFunctionWriteOut(uchar *data, uchar len&#...

I add code to check data toggle like this(AVRUSB run at 16M): /// Token recorded when receive DATA package uchar lastTok; /// /// @brief AVRUSB will call this function when DATA package is received /// @param data received data to process /// @param len received data length /// void usbFunctionWrite...

too busssssssssy these days.
Is there any list to show which PC or chipset is more likely to fail with Bulk Transfer?

I'll try sometime next week. BTW: I tried to check the data toggle by this: in usbdrvasm.S add(myTok is define uchar in main.c): extern myTok in asmcommon.S function handleData insert first: sts myTok,token; this will store token(DATA0 or DATA1) to myTok This will add 2 cycle delay. But if I check t...

This probably means that Sharity was not fast enough sending an ACK so that the host did a USB retry after some time. What clock frequency do you use? Can you reproduce this? If yes, do you have a digital storage scope to analyze it? Would be really interesting to find out why this happens since bu...