Programmer Not Detected (LED2 Flashing fast)

[Anonymous]

Hi, pls could somebody help me, I built the Open Programmer exactly to spec and programmed the pic (verification successful) but when I connect the programmer via the usb port it is not detected and LED2 flashes fast. I read in the manual this has to do with the 10uF capacitor. But I checked connections, replaced the 10uF and even reprogrammed the pic without luck. LED2 still flashes fast and programmer not detected.

Please, any help would be greatly appreciated.

Thanks!

[Anonymous]

Oh sorry I see I am posting as anonymous... My name is Tyler :)

[Alberto Maccioni]

Please make sure you wrote the correct config words.
Try without the DCDC section.
Check again all connections.

[Anonymous]

hanks for your reply. I read in the forum somebody ha a similar issue and it was as a result of VREGEN. I then decided to disable it and form a simple voltage divider network to put 3.6v on VUSB pin. It worked, the computer recognizer it and everything seemed to work properly. I then decided to program a 24c32 eeprom and read it back and it worked perferctly. I then proceded to try and program a 24256 eeprom in circuit but kept getting comunication timed out. I then took it out of the circuit and attempted to program it and it seemes to work and successfully verifies but nothing is actually written. I then tried the 2432 eeprom again and the same problem. nothing writen. I tried to read both eeproms and results are eeprom empty...? I then did a hardware test which fails misserably VPP is always 4.6V and RB5, RB6, and RB7 are always floating low (few hundred millivolts). I am completely stumped!!! Any idea what could be causing this?

Thanks!
Tyler

[Alberto Maccioni]

I think you have the wrong config words.
These are stored in the hex file but you are either overriding the settings or not using them altogether.
Check your programming software; if anything fails set the configuration manually, looking at the source code for the desired values.