seems like when you burn formware in 18f4550 "Table write protect boot" in configuration bits was set to "Enabled". This prevents bootloader from re-programming. Set this field to "Disabled".martinisonline said:I do it too, but everytime i do a 'connect' command, it returns:
Connecting to MPLAB ICD 2
ICDWarn0059: About to re-program ICD2 USB Boot firmware code. Please do NOT disconnect the ICD2 or interrupt this operation!
...Connected
Setting Vdd source to target
Target Device PIC18F2550 found, revision = a3
...Reading ICD Product ID
Running ICD Self Test
...Passed
MPLAB ICD 2 Ready
This is normal??
ICDWarn0059: About to re-program ICD2 USB Boot firmware code. Please do NOT disconnect the ICD2 or interrupt this operation!
Gobol said:Oh, Yeah! Finally it works. Thanks all for good job.
F2455 flashed successfully.
It's very fast comparing to ICD2-RS232. I've used TQFP-s, double sided board and almost all SMD-s components. PCB is 7cm x 4.5cm. And of course its all hand-made
Thanks again.
manuel1139 said:I finally got mine working - however still needs 2-3 seconds while single stepping with some open watches but much more useful than the serial one with 20-30 seconds single stepping.
There is no problem with this schematic.manuel1139 said:which schematic did you use? Especially which target driver did you use? I used the schematics from Lothar Stolz which only uses some resistors to drive the targets PGD & PGC... Maybe that is the problem. I also use MPLAB 7.40.
This is where the problem is. Both should have 20MHZ crystals.I also wonder why the 877 runs with 20 MHZ while the 4550 runs with 48 MHZ clock. Shouldn't this match for the communication? I however didn't see a chance to let the 4550 run with 20 MHZ system clock and 48 MHZ USB clock.
I think, using ext. vpp source is not a good idea, but works, so this is your choice. I suggest u placing R16 after the voltage divider, and R17 should be 6k8(not 8k8).wizpic said:Here is my version of the ICD2 clone I've only drawn the schematic so far and just started to transfer very thing over to th PCB,
Could some one have a quick check for me as i have joined 2 together and poniters or improvements welcome
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