1. Home
  2. Embedded Programming
  3. AVR IPS programming problems

AVR IPS programming problems

Hi all,

I have a very annoying problem: I have an existing design with an ATmega8515, with an ISP connector setup as specified in one of the Atmel appnotes about implementing an ISP connector. It uses a network on the reset line, with a 10k resistor to VCC, a 4n7 cap to ground and a diode across the resistor for protection. This has always worked on a 2313, a 8515 and a Mega8515. I recently upgraded the design to a Mega162 and since then 1 out of three times the board refuses to have the configuration fuses programmed. Also reading the chip ID gives random results many times. Once the fuses are programmed successfully (to use an external crystal at 8MHz), everything runs fine and the code can be programmed too.

Can anyone shed some light on this?

Meindert

Reply to
Meindert Sprang
Loading thread data ...

I'm using a similar network, 10k up, 100nF to GND and 100 Ohm to the ISP.

Hmm, the lot runs on 5V or perhaps lower ? I once found that there is some bit timing, which is dependent on the voltage. While at 5v is was 3ms per bit, it increased to 9ms at 3.3V or so. The programmer, in my case the Equinox from Meridian has the short value fixed. Fortunately, it was editable somewhere in the options. Took me a day. We also had problems with the Mega 163, they got better once we moved to the 323 and now at the Mega32 there weren't any yet.

As of the Mega162 I know nothing.

Rene

--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net
Reply to
Rene Tschaggelar

Everything runs at 5V.

I'm using the STK500 utility from Atmel. No timings to set. I cannot find anything about it on Atmel's website either. I'll try an upgrade of AVRStudio in the next couple of days.

Meindert

Reply to
Meindert Sprang

Try PonyProg from

formatting link

Reply to
dmm

Wouldn't it be logical that the tools from Atmel would work? :-)

Meindert

Reply to
Meindert Sprang

Hi Meindert,

Just a thought - Is your STK500 using the latest latest firmware as included with the latest build of AVR Studio?

Reply to
Lewin A.R.W. Edwards

out

programmed.

I'm not quite sure. I haven't downloaded the latest version yet, so that might be the problem. The STK500 utility itself is V1.40. I'll check that anyway. Thanks for the hint.

Meindert

Reply to
Meindert Sprang

Not necessarily. Similar to Microchip, software is not thir business. It took Microchip about 10 years after the release of

23bit windows to come out with a 32bit MPLAB.

Just in case : There is a Pascal compiler for the AVR that comes with programmer.

formatting link
, including libraries, forum and the lot.

Rene

--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net
Reply to
Rene Tschaggelar

^^^^^

That is the best unintentional description I have come across for ages :-^

--
Paul Carpenter          | paul@pcserviceselectronics.co.uk
    PC Services
              GNU H8 & mailing list info
             For those web sites you hate
Reply to
Paul Carpenter

Hi Meindert,

the problem could be the SPI timing. The mega162 runs at 1MHz when the fuses are not programmed.

There is a command in the STK500 protocol to slow down the SPI. However, I don't know about the STK500 utility, because I use Linux.

/Jan-Hinnerk

Reply to
Jan-Hinnerk Reichert

If that is the problem then Just lower the STK500 clock on the first programming , until fuses are set correctly.

Carsten

Reply to
Carsten

And the $64.000 question is: How?

Meindert

Reply to
Meindert Sprang

reset

the

programmed.

are

Ok guys, thanks for all the suggestions. I completely failed to notice the -! option to set the clock frequency. I have set it to 1MHz and all devices program fine now.

Regards, Meindert

Reply to
Meindert Sprang

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.