BLAZE25
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someone told us that atmega128 is lock so that cannot program with ponyprog,he suggest that use HIGH VOLTAGE AVR programmer but its expensive,but my friend in manila told us also that the problem is the cables use is the problem,i try to convince him that i want to share the diagram of his program device gadget he use but sad to say he didnot answer me,any one can help me to produce that schematic.
@ santoshaxl
sir i also try to connect that ground to pin 25 of lpt pc port but no luck,i think the problem is in fuse bit,my friends told that i need HV programmer.
Hi Blaze25,
When I made a serial programmer and used it with Pony Prog I got the same problem and the reason was "Not connected power pin" which requires 5.0-5.25V power and it's always good to feed this power from your usb port, rather than from LPT or COM port.
If you are interested in making a serial programmer (let me assure you it's the best simplest design i've got and it works great) check this out...
Serial AVR Programmer
From this schematic you can leave the shorting of pin 6-7 in DB9 connecter, and omit the 22p capacitors too, and don't connect the 5V pin with the DB9 connector, rather feed it from the USB port directly and your programmer will work great.
”Hi, no need to use a HV programmer.You can easily solve the fuse bit problem by using an external 1Mhz clock.I have tried this and it works fine for me.
The simplest way is to generate a 1Mhz clock, Just program another MC to toggle its port, connect it to XT1 of your AVR.
Eg.Program
while(1)
{
//High PortX
//Low PortX
}
Am 100% sure about this. Because its not possible to disable serial programming by changing fuse, there is no provision to disable serial programming with ISP. If any doubts just post here
Good Luck.
Your board looks neat.Good Job (hope thats not a ready-made one)
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