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problem with 18f4550 and E-blocks
Posted: Sat Mar 10, 2007 2:25 pm
by samux
Hello
Sorry but I don't speak english very good...
I have already program the 18f4550 with the board but I want to re-program the pis and I have the message "the voltage is too low". I ignore this warning and the board don't recognise the pic and I have the message "Could not ID the onboard chip assuring it is the one specified in the configuration screen, i.e PIC18F4550.
Somebody knows this problem ?
thanks in advance
Posted: Sun Mar 11, 2007 11:09 am
by samux
sorry but my board is : HP-488-00-3
Posted: Mon Mar 12, 2007 10:16 am
by Benj
Hello Samux
Are you using a Power supply to power your HP488 or are you using the USB supply. If you are using the USB supply and the LVP mode has been disabled in the PICmicro then you will need a Power Supply to re enable the LVP mode.
Posted: Mon Mar 12, 2007 5:11 pm
by samux
Thanks Benj for the answer
I use a Power supply with jumper J29 in position "PSU", J20 in position USB and a jumper in position I/O.
When I want to use the LVP mode windows says an error.
Posted: Tue Mar 13, 2007 11:03 am
by Benj
Hello Samux
What voltage PSU are you using. It needs to be between 12 and 14 Volts. Also have you tried replacing the PICmicro as it may have become damaged.
Posted: Tue Mar 13, 2007 5:18 pm
by samux
Hello Benj
the voltage is 12 Volts. In fact I have already use the board at school with a computer (windows 2000) and at my house (with windows xp sp2), I don't arrive to program the 18f4550. I will can know if it still work at the school Thursday.
Posted: Thu Mar 15, 2007 1:01 pm
by Benj
Hello
I have had a similar problem with these chips.
I think that the Code Protect gets set automatically in the PPP configuration so if you program with this setting enabled then the PIC is no longer able to accept write instructions. I could be wrong about this but when I manually set this to disable the chips were lasting more then one program cycle without complaining.
Posted: Tue Mar 20, 2007 5:19 pm
by samux
I have a bad news : the board died. We don't know why the board doesn't work any more but it was under garantee...
Posted: Wed Mar 21, 2007 2:09 pm
by Benj
There have been a few reports of the PPP chips blowing. The best thing you can do is to return it to the supplier you got the board from and then we can take a look at it and replace any parts that have stopped functioning.