Re: [Usbpicprog-technical] cant program the PIC

[Bálint G. <gye...@gm...>]

Hi Frans,

I have only a multimeter, the voltages on the VDD and VPP pins are
about 4,4V and about 12,3V during the programming process.
I found the VDD voltage low, so I drove the target PIC's VDD pin with
a 5V supply. On this way the VPP voltage remained about 12,3V.

Best Regards,
Balint

2013/1/21, Frans Schreuder <fra...@gm...>:
> Hi Balint,
>
> I have never tested the 16F628, because it is obsolete but it' s
> follower the 16F628A should work. The 16F84A should also work but that
> one is very critical about the voltages. Could you measure VPP and VDD
> while programming? preferably with an oscilloscope, but if you don't
> have it try using a multimeter while the programming is in progress.
>
> Kind regards,
>
> Frans
>
> Op 1/21/2013 10:01 AM, Bálint Gyenes schreef:
>> Hi,
>>
>> I build the through-hole version of the usbpicprog. Everything looks
>> fine, but when I try to program a PIC, I get this:
>>
>> Erasing before programming...
>> Erase OK
>> Write Code memory OK
>> Programming the data area of the PIC...
>> Write Data memory OK
>> Verifying all areas of the PIC...
>> Verify code failed at 0x0. Read: 0x00, Expected: 0x12
>> Programming configuration area of the PIC...
>> Error programming config memory
>>
>> I tried it with two PICs, a 16F628 and a 16F84A, the programmer
>> detects both, but at programming the situation is the same.
>> I checked the circuit, it looks correct and the I/O test gives the
>> required voltages on every pins.
>> Could it be the problem that some of the mounted transistors
>> (bs170,bs250, bc547) can't provide enough current?
>>
>> Thanks for the reply.
>>
>> Best Regards,
>> Balint
>>
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>
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