Hi, On Fri, Mar 28, 2008 at 01:36:13AM +1000, Neil Davey wrote: > You can program the chip using ISP as much as you like, until you > program the fuse to disable the reset function of PB5. > It won't act as a GPIO until you do that though.. Once you've programed > the fuse to disable the reset function, then you will need HVSP to > reprogram the chip (and also can reset the fuse IIRC, please correct me > if I'm wrong)
That's good news. So I guess I will program my chip with a programmer made of a few resistors, and the hope I won't have to reprogram it later. > Is just getting an STK500 an option for you? It provides HVSP capability. On Thu, Mar 27, 2008 at 06:30:34PM +0100, Joerg Wunsch wrote: > > Even cheaper: an AVR Dragon. Well, what I'm willing to build is worth around $10. As far as I can see, an STK500 or an AVR Dragon cost around $50, so I consider them quite expensive for my use... Is there any reason why it would be impossible to build a HVSP programmer out of a parallel port plus a few off-the shelf components (at least a transistor to switch the high voltage, and a regulated 12V power supply), and rely on the computer software to perform all the bit-banging? Cheers, Nicolas _______________________________________________ AVR-chat mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/avr-chat
