Re: [avr-chat] how to connect USBasp to attiny2313

[YuGiOhJCJ Mailing-List]

And this is the attached file.

On Thu, 8 Aug 2013 05:23:50 +0200
YuGiOhJCJ Mailing-List <address@hidden> wrote:

> OK, so to summarize:
> - My target micro-controller attiny2313 clock is lower than 1.5 MHz
> - So, I need to put a jumper (J3) between the pin 25 of the usbasp programmer 
> internal micro-controller atmega8 and the GND (pin 3, pin 5 or pin 21).
> 
> We can verify this information in the README file[1] and in the schematic 
> image[2] of the usbasp programmer.
> 
> I have opened the usbasp to see how I can set the jumper of the usbasp.
> 
> As you can see in the attached image, this is very little and I don't know 
> how to wire the pin 25 to the GND correctly.
> 
> Can you give me an advice on how I can wire the pin25 and the GND easily ?
> 
> [1] http://www.fischl.de/usbasp/Readme.txt
> [2] http://www.fischl.de/usbasp/bilder/usbasp_circuit.png
> 
> 
> On Mon, 05 Aug 2013 10:11:07 -0400
> Ormund Williams <address@hidden> wrote:
> 
> > On Mon, 2013-08-05 at 08:23 +0200, YuGiOhJCJ Mailing-List wrote:
> > > I have 3 questions (A, B and C).
> > > 
> > > A) Thank you for the image.
> > > I can see on your image that I am using the cable correctly.
> > > Indeed, I put the coloured part at the top, so the pin 1 and 2 are at the 
> > > top.
> > > But I can see on your image that we see the back of the connector (the 
> > > part without the holes where we plug the pins).
> > > That's not what I am doing.
> > > Indeed, I am watching the connector in front of me, so the pin 1 and 2 
> > > are reversed when I am using it.
> > > You can watch in the attached usbasp_connector_2_small.png file what I am 
> > > doing.
> > > Am I wrong ?
> > > 
> > That was wrong, and may have caused damage.
> > 
> > > B) Using your way to do (taking the connector from the back instead of 
> > > from the front), I can use avrdude 5.11.1:
> > > ---
> > > $ sudo avrdude -p t2313 -c usbasp -U flash:w:main.hex
> > > 
> > > avrdude: warning: cannot set sck period. please check for usbasp firmware 
> > > update.
> > > avrdude: error: programm enable: target doesn't answer. 1 
> > > avrdude: initialization failed, rc=-1
> > >          Double check connections and try again, or use -F to override
> > >          this check.
> > > 
> > > 
> > > avrdude done.  Thank you.
> > > ---
> > > 
> > > Using your way to do (taking the connector from the back instead of from 
> > > the front), I can use avrdude 5.2:
> > > ---
> > > $ sudo avrdude -p t2313 -c usbasp -U flash:w:main.hex
> > > 
> > > avrdude: error: programm enable: target doesn't answer. 1 
> > > avrdude: AVR device initialized and ready to accept instructions
> > > 
> > > Reading | ################################################## | 100% 0.00s
> > > 
> > > avrdude: Device signature = 0xffffff
> > > avrdude: Yikes!  Invalid device signature.
> > >          Double check connections and try again, or use -F to override
> > >          this check.
> > > 
> > > 
> > > avrdude done.  Thank you.
> > > ---
> > > 
> > > So you can see the avrdude device signature has changed: 0xffffff 
> > > (instead of 0x000000).
> > > Do you understand why ?
> > > You can watch in the attached usbasp_microcontrolleur.png file what I am 
> > > doing.
> > > 
> > When you had it reversed the MISO pin9 was grounded so all data will
> > come back as zeros.
> > 
> > > C) You say that there is a problem about the SCK frequency.
> > > Instead of open the usbasp to resolve this problem, what do you think 
> > > about changing the internal RC oscillator of my attiny2313 ?
> > > Indeed, if I put a component between the XTAL2 and XTAL1 pins (pins 4 and 
> > > 5) of my attiny2313 it may resolve the problem.
> > > This solution should avoid to open the programmer.
> > >
> > You cant change the frequency like that the internal RC oscillator is
> > not connected to any pins you must set the correct fuses and to do that
> > you need to program the chip.
> > 
> > I don't think you have a choice but to open the programmer or get a
> > different one.  
> > 
> > 
> > Regards
> > 
> > -- 
> > Ormund
> > 
> > 
> > _______________________________________________
> > AVR-chat mailing list
> > address@hidden
> > https://lists.nongnu.org/mailman/listinfo/avr-chat

usbasp_open_front_small.jpg
Description: Binary data