Objective Development Forums

making USBasp hardware with AVR-Doper 2008-04-27 firmware

2008-11-29T23:08:54+02:00

You can disable some functionality in hardware.h, just look at the first few defines.

The STK500v2 firmware version can be configured in stk500protocol.c, see defines for STK_VERSION_MAJOR and STK_VERSION_MINOR.

Statistics: Posted by christian — Sat Nov 29, 2008 11:08 pm

making USBasp hardware with AVR-Doper 2008-04-27 firmware

2008-11-27T21:19:57+02:00

Green led is used like "ON" indicator. But all who build USBasp and use your firmware will have a "dead" led, this does not look good... I have rebuild AVR-Doper firmware and turn it on.
Is there any way to compile USDasp-Doper for ATmega48, HID-only, without debug? I've got around 4.6 kbytes with avr-gcc 4.3.0 from WinAVR-20080610 package. Maybe avr-gcc 3.x.x will give smaller code, but i can't test it...

And almost forgot: current STK500 software version is 2.0A, AVRstudio will always ask about firmware upgrade. CDC mode works stable only on my laptop, so i use HID mode and don't care about version.

Statistics: Posted by ahulap — Thu Nov 27, 2008 9:19 pm

making USBasp hardware with AVR-Doper 2008-04-27 firmware

2008-11-27T20:26:30+02:00

As far as I know, the green LED is not actually used by USBasp either. Since AVR-Doper does not have a status to display with this LED, we just leave it unconfigured.

Statistics: Posted by christian — Thu Nov 27, 2008 8:26 pm

making USBasp hardware with AVR-Doper 2008-04-27 firmware

2008-11-27T20:08:49+02:00

I have tested it (precompiled usbasp-mega8-12mhz.hex), and it works!
But one little thing left: USBasp have 2 LEDs, and green (PC0) is always off. Maybe set it on forever in hardwareInit()?

Statistics: Posted by ahulap — Thu Nov 27, 2008 8:08 pm

making USBasp hardware with AVR-Doper 2008-04-27 firmware

2008-11-27T12:10:02+02:00

Thanks for the info about Timer 1 and the jumper! I have made a new release which fixes these issues. Please let me know how it works!

Regarding RxD and TxD: These pins are swapped because they name the function on the target, not the programmer. RxD must be connected to TxD and vice versa.

Since UART functionality is handled by internal hardware, this does not matter anyway.

Statistics: Posted by christian — Thu Nov 27, 2008 12:10 pm

making USBasp hardware with AVR-Doper 2008-04-27 firmware

2008-11-21T10:48:16+02:00

And are HWPIN_ISP_TXD and HWPIN_ISP_RXD set correct to PD0 and PD1? Hardware RXD and TXD is PD0 and DP1. With debug interface enabled hardware UART overrides this pins, and all ok. But when debug is disabled this pins are set in opposite direction?

Statistics: Posted by Guest — Fri Nov 21, 2008 10:48 am

making USBasp hardware with AVR-Doper 2008-04-27 firmware

2008-11-21T09:57:16+02:00

I have a 2 versions of USBasp: with original schematics and very simplified (without LEDs, jumper, and D+ and D- moved to PD2 and PD3). Original does not work, but modified works! I think that it is something with PB1 and PB0... and found that TIMER1 is initialized for PWM output for METABOARD_HARDWARE.
Mod like this will help:
#if USBASP_HARDWARE
/* do not enable clk output */
#elif METABOARD_HARDWARE
/* timer 1 configuration (used for target clock): */

And one thing more: interface type detection works unstable: readInterfaceType is called before hardwareInit() and pullup on jumper pin is not enabled, so it was very rare to get CDC enabled for me.

Statistics: Posted by ahulap — Fri Nov 21, 2008 9:57 am

making USBasp hardware with AVR-Doper 2008-04-27 firmware

2008-11-19T22:09:58+02:00

Sorry, I don't have a real USBasp board for testing, only something very similar. So I can't test all details.

Anybody out there who can comment or who has even found a bug?

Statistics: Posted by christian — Wed Nov 19, 2008 10:09 pm

making USBasp hardware with AVR-Doper 2008-04-27 firmware

2008-11-18T13:04:05+02:00

Hi All. I'm having same problem. I've tried to upload to my usbasp usbasp-mega8-12mhz.hex. When i plug the device into usb I get USB device not recognized (in device manager its "Unknown device"). With usbasp original firmware device works. I wen through the "hardware.h" defines for usbasp. They look OK.

I can help fix this bug, but i don't know where to look.

When I'm using the usbasp-mega8-12mhz.hex the device is working in HID mode?

regards hot-dog

Statistics: Posted by Guest — Tue Nov 18, 2008 1:04 pm

USBASP firmware

2008-05-16T20:49:25+02:00

Not work on usbasp on my board. Strange defines in main on timer 1 configuration. Sorry if I dont right

Statistics: Posted by Guest — Fri May 16, 2008 8:49 pm