alunaro
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alunaro said:Hello,
I'm trying to program a 18F4550 (for ICD2 clone). I'm using the only programmer i have: a Te20-se. It's attached to a breadboard where is the 40 pin socket for pic (used the breadboard like adaptor)
I use Winpic (last version downloaded from site), configured to use te20.
I have tested with 16F84, 876, 877... all ok (note: i tested all pics both te20 sockets and breadboard). Only 4550 doesn't work.
1. It's not detected sometimes... All points to a bad connection in breadboard.
2. When winpic can detect it, i try to program.. but always report errors in different
addresses. Normally it fails in 1, 2 or 3%. 1 time it reached 6% :O lol xDD
3. In hardware test Vpp is about 12.8V (winpic option).
When reading pic, it drops to 11.8-11.5 V.
4. Pics can be read and erased without problems.
Following some advises in other posts, i used some capacitor in PGC and GND, etc.
Still the same error.
Some idea?
alunaro said:This evening I'll try all suggestions... together. Til now all the efforts were unsuccessful.
Reduce lenght of programming cable (last days i attached programmer directly to port, but it's quite ackward -too many wires around xD-)
Use 0.1nF capcitor in VDD-VSS (i understood in VPP from PICS comment). I think I used it in my tests (i can't remember exactly no. It's 8:45 and my brain still is heating neurons)
Will I have to build other "low-cost" programmer by LPT port? Only time will tell... :/
Late will report my results.
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