Re: [Usbpicprog-technical] Portable programmer

[Frans S. <fra...@gm...>]

Dear charles,

It's quite some project that you are propposing here. Maybe it would be
good to put your changes to the hardware and software on github so that i
can also link to it.
The i2c eeprom code has never been tested thoroughly so it could be very
possible that it doesn't work that stable. I think we need to debug a lot
there.
Of course for a stand alone programmer, a lot of things will have to be
implemeented in firmware, right now the firmware only programs blocks of 32
bytes or so. The higher levels have to be implemented completely.

I am now very busy on another project so i am willing to help, but i can't
spend so many hours on programming usbpicprog. When you need help regarding
the software i can do things, i can also fix bugs but big changes i simply
have no time for right now.

I would like to see your schematics on github though!

Kind regards,

Frans
Op 28 jan. 2012 19:04 schreef "Charles Kerr" <cha...@fr...> het
volgende:

> Hi Frans
>
> My aim is to modify the usbpicprog into a portable programmer so that I
> can download my code into an external eeprom, remove the usbpicprog from
> the pc, then program my target using the usbpicprog as a stand alone
> programmer.
>
> I have added an eeprom (24LC64) to the usbpicprog board (I did forget the
> 2 x 10k pull up resistors on the SCL and SDA lines but have added them as a
> mod on the board), a pushbutton switch and a 5v regulator. As you can see
> from the schematic I used the pic sda and scl lines for the eeprom and
> changed the pgd and pgc lines to pins 17 and 18 respectively. I changed the
> firmware to use rc6 and rc7 and can program external pics with no problem.
>
> Unfortunately I can not seem to program an external eeprom (connected to
> pgd and pgc) or the on board eeprom (using sda and scl). monitoring with a
> scope I am getting activily on the clock and data lines but I suspect my
> timing is out. I have tried software and hardware I2C routines with no luck.
>
> I was thinking that if the usbpic prog did not detect an external pic, (or
> one could have an option in the pc programming software) it could dump the
> program memory, data memory and config bits to the eeprom. when the
> pushutton is pressed, to read the data from the eprom as though it were
> coming from the usb port and program the target.
>
> Unfortunately I am stuck and not too sure how to proceed.
>
> Do you have any advise and could you help with the firmware modifications.
>
> Kind Regards
>
>
> Charles Kerr
> ch...@cr...
>
> Cape Town
> South Africa
>
>
>
>
>
>
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