RE: [avrdude-dev] FW: avrdude + avrstudio / stk500 / ATMEGA162 - programming problems

[Steve Bentley]

Galen, Thanks for the help.

I have had some success!!! I can now program the chip using High-Voltage
Programming mode ONLY. I wanted to reassure myself that I did not have
any board, power supply, chip problems.
I connected PORTD to PROG-CTRL and PORTB to PROG-DATA as described in
the stk documentation. Then using AVRStudio I could successfully read
the signature. I then programmed a simple (flashing light) program.
Switching off the power supply, disconnected the two cables, hooked up
the leds, switched back on and lo and behold I saw flashing lights. 

This is at least a temporary solution. Inserting and removing the cables
will become tedious very quickly I fear. :)

Returning to the ISP issue. I believe Galen is correct with his
suggestion regarding sck but currently I only receive the following:

////
Avrdude -p atmega162 -c stk500 -t

avrdude: stk500_program_enable(): failed to enter programming mode
avrdude: initialization failed, rc=-1
         Double check connections and try again, or use -F to override
         this check.


avrdude done.  Thank you.
////

Not being very familiar with avrdude, I was not sure when and how to set
sck. My idea was to set sck in the terminal mode, is this correct?

Obviously this is different to the behaviour that I had previously when
avrdude would complain at the verification stage. I'm not sure why this
is, I guess in my fiddling about I have forgotten to change something
back. So once again here are my settings on the stk board.

VTARGET = ON
AREF    = ON
RESET   = ON
XTAL1   = ON
OSCSEL  = 1+2
BSEL2   = ON
PJUMP   = OFF
ISP6PIN connected to SPROG3

UGGHH!!!

Steve

-----Original Message-----
From: Galen Seitz [mailto:address@hidden 
Sent: Mittwoch, 22. Dezember 2004 20:52
To: Steve Bentley
Cc: 'avrdude-dev'
Subject: Re: [avrdude-dev] FW: avrdude + avrstudio / stk500 / ATMEGA162
- programming problems 



>From the mega162 datasheet:

Default Clock Source

 The device is shipped with CKSEL = 0010 , SUT = 10 and CKDIV8
 programmed. The default clock source setting is therefore the Internal
 RC Oscillator with longest startup time and an initial system clock
 prescaling of 8. This default setting ensures that all users can make
 their desired clock source setting using an In-System or Parallel
 programmer.

...

Calibrated Internal RC Oscillator

 The calibrated internal RC Oscillator provides a fixed 8.0 MHz clock.



This means that the clock coming from the STK500 oscillator is not being
used, assuming this is the first time you have programmed the part (ie
it is in its factory default state).  Thus the actual system clock is 1
MHz.  When the SPI is configured as Slave, the SPI is only guaranteed to
work at fosc/4 or lower.  You need to set the SCK period >= 4 us.  Use
the avrdude command 'sck 4'.  I think this will solve the problems you
are having.  BTW, AvrStudio has the ability to change the SCK period,
but I can't remember where.

galen


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