Do you have the box checked for ICSP?
Rick

Josh Koffman wrote:

> Ok, I'm stumped. I've been trying to figure this out for the past hour
> and a bit, and I've gotten nowhere. I'm working on a project with two
> 18f252s on a single board. They both run independantly, and have their
> own oscilators and ICSP ports. I am using a 2x5 header to isolate the
> ICSP signals. I am trying to program using the WARP13a with Redback10a
> and a homemade ICSP cable that's about 18 or so inches long. The cable
> is 10 conductor ribbon cable. I'm using the WarpCore software, not MPLAB
> to run the programmer.
>
> Anyway, ICSP just isn't working. I've verified all the connections, and
> they all check out. I've even got to the point of measuring from the ZIF
> socket on the programmer to the socket on my board, and everything
> matches up. My hex files will program just fine into the chip when it's
> in the socket, but not when it's in circuit. It will even program in the
> ZIF socket and I happen to have the ICSP cable plugged it still, so I'm
> thinking that it's not the cable. I can't even verify in circuit. I've
> checked and rechecked my circuit board, and with the ICSP cable plugged
> in then I'm only connecting to the chip. I've even puled as much as I
> can off the board so there's only a couple of LEDs left, no crystals or
> anything else. With the WARP13 diagnostic, I read 4.97V at VDD and
> 12.86V at VPP on both the ZIF and socket in my circuit.
>
> So, I have no clue what's going on. I can't program in circuit, and if I
> program in the ZIF, then toss it into circuit and try to verify, it
> fails. I'm getting a bit frustrated, as everything else seems to check
> out. Only thing I can think of is the length of the cable and the speeds
> used in programming, but would an 18inch length of ribbon cable really
> cause so many problems? Anyone have any suggestions?
>
> Help!
>
> Thanks,
> Josh
>

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