Attiny programming

[Bertho]

Hi all,

Just to report a funny success story. I was trying to program an ATTiny13 with fairly heavy loaded pins (charliplex on all). The result:
- avrispmkII --> fail
- avr dragon --> fail
- buspirate --> success

This is done with the buspirate as prize from the 7400 logic competition :-)

Unfortunately, the buspirate does not do HV programming, so I can't actually use the reset pin (yet). This is a BP v3.6; is there a way to hack the BP so it can do HV programming? I read something that there were not enough pins on BP v3?

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Greetings Bertho

[arakis]

There aren't really enough pins on the v3 Bus Pirate to do the AVR high voltage programming mode. The PIC modes work with some chips, but it is rough still.

BP v4 could do programming, but there is no production hardware (or software) to do that yet (nor is it planned, depends on the community doing it).

Ian's response from a similar thread...

[Sleepwalker3]

Could you not temporarily unload the pins for programming?

[Bertho]

Could you not temporarily unload the pins for programming?

Ehm, no. It is an SOIC SMD part that is in a fixed all SMD setup. The pins are loaded by charliplex leds (and a small series resistor). The reset line is not part of the charliplex (intentionally) and there is a zener+resistor on the reset line to keep it from frying the attached LED while HV programming.

What I can do is wait with the reset-disable-fuse until I'm satisfied (hopefully). That way I can use the SPI programming with the BP.

I've adapted my program-board (with pogopins) to include a buffer on the lines. I'll try that with the dragon. HV programming is, for this first test-board, a bit awkward because I forgot to export one cpu-pin to the pogopins. A handheld wire will have to do until the board is redesigned.