Objective Development Forums

Yes. Programming works either through the USB CDC or HID device class. Drivers for both are included with every operating system. Debugging is a custom extension which requires a separate driver on Windows (not on all other operating systems).

To enable debugging in AVR-USB, compile with -DDEBUG_LEVEL=1 or -DDEBUG_LEVEL=2. Debug output is sent to TxD at 19200 bps consisting primarily of hex dumps.

I would recommend to enable the watchdog only if everything else works.

Do you have the filter version of libusb-win32 installed? This is required in order to connect to a device already associated with a different driver.

Don't know whether they would work. You need to clamp the voltage at ca. 3.3 V.

If you can't get zeners, you could try to reach the same limit with LEDs in forward direction.

These are two different issues. USB2LPT is about drawing less power when the host is in sleep mode. What you want to do is consume less (battery?) power if not connected to USB or if there is no USB traffic. It should be safe to put the AVR into sleep mode as long as the hardware interrupt can wake ...

This does work, provided that you don't use the higher priority hardware interrupts and that you configure the interrupts correctly. See the end of usbconfig-prototype.h.

You should implement usbFunctionSetup() in your code. See the examples which ship with avr-usb...

Running UART interrupts with global interrupts enabled is tricky, because with the naive approach you end up in an infinite interrupt loop. I've done the following: #define REG_UARTFLAGS_B GPIOR1 register uchar uartScratch asm("r2"); ISR(SIG_USART_RECV, ISR_NAKED) { // be careful not to mo...

Try HID mode with avrdude...

I think the debug interface works only in HID mode. But then it should work on Windows as well.

There is no progress yet. The newer versions of CodeVision AVR fix many bugs which made the port impossible. However, there are still some major obstacles. We have factored out the compiler dependent stuff into usbportability.h and some work for CodeVision AVR has already been done. Feel free to wor...

Just a note: Please use 1k5, not 2k2. The current through the zeners is so high that you are close to the threshold voltage with 2k2.

The problem here is that you need to use bulk endpoints which are not allowed for low speed devices. You can still declare them, but some operating systems won't accept them.

Of course. However, the time spent in the USB interrupt is the same.

Thanks for the patch! This will be in the next release of AVR-Doper.