cant program 18F452 using LVP

[RamonetNet]

Good evening all !

I am trying to program a 18F452, to flash a LED, as usual.
The software is WinPicProg, and the hardware is a LVP from here

>>> **broken link removed**

Yes, you already knew, I got "Verify failed at 0x0000" message.

The RS-232 interface is providing 9 volts only.
( I have another that gives 10 volts ... )

Is it enough or I must go to another machine ?

I read a lot about +13 volts,
but I guess that is for High Voltage Programming ...

Thanks for any ideas - Ramon.

 

[Nigel Goodwin]

Good evening all !

I am trying to program a 18F452, to flash a LED, as usual.
The software is WinPicProg, and the hardware is a LVP from here

>>> **broken link removed**

Yes, you already knew, I got "Verify failed at 0x0000" message.

The RS-232 interface is providing 9 volts only.
( I have another that gives 10 volts ... )

Is it enough or I must go to another machine ?

I read a lot about +13 volts,
but I guess that is for High Voltage Programming ...

Yes, LVP is only 5V - and uses an extra pin.

But WinPicProg doesn't work with a serial port, only parallel ports, try IC-Prog.

 

[RamonetNet]

I dont have to say you are right ...
I meant ICprog but was thinking diferent ...



Does that mean then WinPicProg always uses HVP ?
Ramon.

 

[Nigel Goodwin]

I dont have to say you are right ...
I meant ICprog but was thinking diferent ...



Does that mean then WinPicProg always uses HVP ?
Ramon.

Almost all programmers do, LVP is very rare (as it's pretty pointless).

 

[RamonetNet]

I am attracted to LVP because it uses just few resistors and no external power supply, once the RS232 can provide the voltage.
I have one pin less ? No problem : I've got 39 left !
Also 18F452 has 2 pins for Vdd and 2 for Vss, and nobody is complaining !

 

[mvs sarma]

Almost all programmers do, LVP is very rare (as it's pretty pointless).

Ramon, be realistic. Your need is, I suppose to be able to program a PIC and go on doing it in a way to learn program writing. It is not a question of number(count) of pins, but in port B loosing a pin would mean some real loss. A byte short of 1 bit, whether used as output or input at digital level.

No point in liking because less components. I do agree a design with minimum components (if it is a design) should work trouble free.

Finally, at the end of discussion, if your purpose is not served, what are we gaining.

Please do go for a PICKIT2 and your goal might be well achieved. I have it and believe it functioning well.

 

[kchriste]

I agree with the responses above. But one other thing to consider is the PIC a virgin? If not, and it had an encounter with a HV programmer which turned OFF LVP capability, then you are out of luck without a HV programmer. The LVP bit can only be changed with a HV programmer.
I'm not sure if this will work, but have you tried turning off FIFO buffers for the serial port?

 

[RamonetNet]

no, mr kchriste - no HVP yet.
A bit better - I had a struck of luck, melted
(1) **broken link removed**
with
(2) **broken link removed**
...
and now I have a working LVP for 18F452 :

>>> http://www.tinet.org/~sag/pic452.htm#pic_lvp

Which does provide a lot of pleasure to a newbie, doesn't it ?



Thanks everybody for your support, in all forms !

 

[Pommie]

Well done. It's a shame that the PicKit2 uses the RB5 (PGM) pin in it's design or this would have been a nice way for people to get it programmed.

Mike.