Archive for category USB

New masks for the USB ASP

Posted by Sajid Muhaimin Choudhury in Microcontroller, USB, avr, programmer on February 20th, 2009 , 8 Falgun 1415

These masks are designed by me for the USB ASP Programmer designed by Tomas Fischl (http://www.fischl.de/usbasp/)

I used series resistors with MOSI MISO SCK and RST lines. They are used for protection of the ATmega8 of the programmer. They can be replaced with short circuits like the original design.In my design, the resistors probably causes some rise time issue, so the programmer will not work unless the slow sck jumper is shorted out. And power is not drawn from the USB port, and taken from the external circuit. Reversing polarity of Vcc and GND will certainly cause the programmer to die. I included a Zener Diode in my design to limit the reverse polarity voltage, but don’t know how effective it would be. I’ll try to make another design with 5 wire-output, that draws power from USB port.



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USBASP Programmer for AVR is working on Windows Vista

Posted by Sajid Muhaimin Choudhury in USB, avr, programmer on February 17th, 2009 , 5 Falgun 1415

Finally I could get my USB programmer to work with windows vista. Firstly, I stripped of the breadboard from all previous connections, and reconnected the circuit. This ofcourse proved fatal to two of my microcontrollers, as I accidentally connected +12V to Vcc rail, instead of the input to the 7805 IC. I connected the programmer to PC, and it said unknown device. I knew I connected the D+ and D- wires from USB port wrong. The final bread board looks like this:

So I swapped them and replugged the USB. This time the device was recognised as usbasp, and windows vista asked for driver. I supplied the libusb driver given with the fischel’s package (http://www.fischl.de/usbasp/). Windows said something about device compatibiliy. I chose to ignore, and the device installed successfully.
Now I opened command prompt and typed  avrdude -c usbasp -p t2313
 Command prompt returned  error: could not find USB device “USBasp” with vid=0×16c0 pid=0×5dc


I tried to search the forums. They suggested to use 2007 build of winavr, I tried that (replaced avrdude.exe in the C:\winavr\bin directory with the 2007 version). Some of them also suggested to use an older version of libusb. So I did that too. After spending an hour, I did some thing I should have done a long time ago. I clicked on the orb (start), typed ‘cmd’, so Vista start menu searched cmd.exe. I right clicked on it and selected “Run as Administrator”. Now when I typed

C:\Windows\system32>avrdude -c usbasp -p t2313
found 8 busses
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.02s
avrdude: Device signature = 0×1e910a
avrdude: safemode: Fuses OK
avrdude done.  Thank you.

 

Wow, the device actually worked!! I tried several times and it was working. I started the AVR8-Burn-O-Mat and changed some settings.
Burn O Mat seems to work fine too. Just too bad it doesn’t have the buffer of ponyprog, and the hex display. It is just great otherwist, and has a lot better fusebit editor.


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USBasp: The USB based AVR programmer

Posted by Sajid Muhaimin Choudhury in Microcontroller, USB, avr, programmer on October 27th, 2008 , 12 Kartrik 1415

Update: My Programmer is working now. Read Here.

My laptop does not have serial port. And ponyprog, up until now, have not provided support for any USB programmers. Today, I constructed my first USB programmer on a breadboard. I had a old USB extenstion cable which was out of order as the header was slack due to wear. I cut of that part and soldered breadboard wires.

My first goal was to make a ponyprog compatible programmer that emulates parallel port. I started with: USB2LPT

Afterwards, I realized that the emulation makes programming too slow. Thus I had to move to a dedicated programmer. But I really like a GUI for inputting, especially the fusebits. AVRdude is a command prompt based programmer. A wrong fusebit setting can lock the microcontroller irrepairable by a Serial Programmer.

Then I found AVR8 Burn-O-Mat: GUI for avrdude . The interface is even better than pony prog for fuses. It actually has small comments beside fusebits. AVRdude even supports my simplified SIProg. So I proceeded to make the famous USB ASP (http://www.fischl.de/usbasp/) I forgot to connect the ICP and INT0 at first, and kept getting “Unknown USB device”. I reflashed 4 times. Finally the programmer was operational and the driver was installed successfully.

I’ll give details of my schematics later. Here is a picture of the circuit.

Update: My Programmer is working now. Read Here.

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