mramos1

I dropped an 8 position switch on a board (port B), figured no pull-ups as I saw weak pullups.

Weak pull-ups are for output only (as I now read). I have all the pins grounded on the other side of the switch.. Any quick fix other than soldering resistors to 8 pins.

Killed my ICD2 as well. Why the topic is bad night. I am back to the parallel port programmer now.

William At MyBlueRoom

Pretty hard to kill the Inchworm, just drop in a new 16F877A.

The pullups on PORTB are for input only, the Firefly uses them for it's switches and they work fine. Sounds like you drove the wee PICs I/O to gnd.

http://ww1.microchip.com/downloads/e...Doc/31009a.pdf I/O ports

The ICD2 should be real hard to kill, assuming you're not using the mclr, PGC & PGD for anything except the ICD2.

Attached Images

pullups.gif (8.3 KB, 9 views)

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justDIY

I don't see how shorting the pic's pins to either rail would kill the pic, they're internally current limited.

what kind of problem are you having exactly with the dip switch?

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mramos1

Thanks Bill and justDIY..

I just soldered in some 1/8th watt 10K pullups for now.

I wanted to use the weak pullups on port B (input wise). But the PIC never saw high when I flipped the switches to open. I pulled the PDF from microchip and it made it look like they were for output only.. I was in a rush and did not want to read, posted here.. And went to solder them in.

But I would like to use them on the pic chip in the future (for input). If they work for input. Will read it tomorrow as it is late.

Bill. I had a project where I received a USB2 ICD2 and an USB1 ICD2 (Olimex the USB1 is called). The USB2 was FAST as heck and very small so I was using it (was going to make it my laptop programmer). I used it tonight and it just stopped working. I gave my inchworm to my Grandfather this last weekend, he drove out to see me and the grandkids. And he is 5 hours away. He is a PCB guy and I want to get him into the PICS (he is retired and looking to have fun)..

I blew the USB2 ICD2 (somehow, Windows just stopped talking to it), or the driver seemed to get wacked out. So I dug in the closet for the USB1 unit. It did not work. Well it sort of worked but MPLABS said see ICD2 status TAB. I looked for that, could not find it.. Gave up.

So I pulled out a parallel P16PRO40 and finished (like the old days). It is like I am back at square one. But the project is done, blood presure is up..

After I finished I realize, the inchworm (though slower, it is serial) would have worked as it has no "&*!@%" USB interface. I will send a USB one to GrandDad and get the inchworm back. What a pain tonight was.

AND I have extra 877A's, the schematics to it and it is not USB.. What was I thinking... GrandDad wanted the firefly too, but the middle son would not part with it

Looks like speed kills and it almost got me tonight..
I hate USB..

William At MyBlueRoom

Did you clear option_reg bit 7 to zero (that enables the pullups)

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phalanx

If you need to use your ICD1, you will have to downgrade to MPLAB 5.7. That is the last version that supported the ICD1.

mramos1

My backup might work, I get Failed Selftest, I think it might require power on the target. Will check it tonight.. They are all ICD2 so should be OK on the firmware.