Objective Development Forums

Hi, I have just noticed that the July/August issue of Elektor contains an AVR-Programmer, which seems to be based on AVR-Doper. I didn't manage to download the sources but it looks like it is based on ObDevs USB-driver, even though ObDev is not mentioned at all Not a nice policy... Regards, Tom

If you use new AVR chip types make sure to switch off the watchdog timer before reenumeration as the late AVR MCUs don't switch off the watchdog on reset. If the watchdog is still running after a reset, reenumeration will fail. See my posting here for details: http://forums.obdev.at/viewtopic.php?t=...

Correction,

to my previous post

I changed the minor version to 10 and all works fine now.

The newly built firmware doesn't work properly, see my other posting:

http://forums.obdev.at/viewtopic.php?t=1351


Regards, Tom

We calibrate on every USB reset anyway. It seems I don't fully understand how this works yet. How will a USB reset be initiated? Does this happen on first connection only? Can the host also initiate a USB reset? Exactly on what condition and from where will calibrateOscillator be called? Thanks for...

Hi Christian, thanks for this hint. It was the watchdog firing resets during calibration. Now everything works fine. BTW: The auto-calibration works very well and subjectively does not require any time. Therefore I suggest not to store the CSCCAL value in the EEPROM and reuse it but to recalibrate o...

I don't use interrupts in my application. Also, I don't see the code write any value into the EEPROM.

It looks as if the AVR undergoes continuous resets. Any other idea what could go wrong?

Did I miss out on anything else inside the usbconfig.h?

Regards, Thomas

Hello Christian, I have tried your OSCCAL auto-calibration code. In easylogger it works fine, but I can't get it running in my own application. Here is what I did: 1. I have updated the drivers directory usbdrv with the latest drivers, recompiled my project and flashed it. Works fine. 2. I have edit...

Great! I'll try this!

Thomas

Hi, I have successfully built up AVR doper and it works very nicely in HVSP mode so far from within AVR Studio in COM mode. Being a newcomer to AVRs I have a few maybe stupid questions: 1. I have noticed that different com port numbers are assigned depending on which USB port of my PC is used. In co...

Hi, my understanding is that usbSofCount should increment every millisecond. Well, I tried this on my Easylogger hardware and I added a feature so I can read usbSofCount via USB. I find that usbSofCount increments only very rarely, not even every second, sometimes more often depending on the USB tra...

the host assigns an non-zero usbDeviceAddress

Is there such a global variable for the AVR firmware, too, that shows that connection was successful?

Up to version 2007_10_23 the 16.5MHz driver works for EasyLogger.

Starting version 2007_12_01 there's the problem.

Regards, Tom

Hi Christian, I have run successfully EasyLogger.2007-07-19.zip. I have replaced the drivers by the ones found in PowerSwitch.2008-02-05.zip with the described problem. Is there something I can do for troubleshooting? BTW: I have flashed the above powerswitch application to an ATTINY2313 with 12MHz ...

Think I found the answer in the forum:

usbSofCount

Tom

Hi, as I want to use usbSofCount in my Easylogger variant, I went about to upgrade to the latest USB driver. I deleted the usbdrv directory and replaced it by the one found in the latest powerswitch files. I DID NOT MODIFY usbconfig.h. Recompilation went ok with 0 warnings and 0 errors, but the devi...