wouter van ooijen wrote:
>> Actually, there's no reset circuit.  /MCLR is set to I/O mode and the 
>> only thing connected to it is Vpp on the ICSP header.  (However, if 
>> capacitance is still a problem, it bears mentioning that this is a 
>> solderless breadboard.)
>>
>> Someone else mentioned that it might be a "use VPP first 
>> program entry" 
>> thing.  I can't test that theory yet because pk2 (the PICkit 2 driver 
>> program on Linux) doesn't yet have a Vpp before Vdd setting.  I'm 
>> working on getting a copy of Win2k on a spare machine to see 
>> if this is 
>> indeed the problem...
> 
> Using those settings Vpp-before-Vdd is probably needed. With the Windows
> software that is not selected explicitly, so I am not sure that is
> indeed the problem. What decoupling do you have on Vdd? Should be a
> 100nF near the target chip, and nothing more.

I got the Win2k box up and running, and it seems indeed that the problem 
is the Vpp first thing.  Specifically, here's what happens:  Without Vpp 
first, getting the programmer to recognize the chip (Tools > Check 
Communication) seems to work (I couldn't get that far on the Linux 
software).  However, I get "No device detected" for read, write, verify, 
erase, and blank check unless VPP First Program Entry is on.

Good news: Problem solved.

Bad news: I'm thus limited to the Windows box across the room for PIC 
purposes. Kind of annoying since my workflow consists primarily of Unix 
utilities, but I guess I'll live.

Thanks!
dro
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist