Re: [Usbpicprog-technical] Raspberry Pi PIC Programmer Help?

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

Hi Will McElderry,

It sounds nice, but how do you plan to convert the voltages (5V -> 3.3V) 
and how do you supply the 12V programming voltage?
I guess you will need some additional hardware.
It is possible though to run usbpicprog on the raspberry pi.

Regards,

Frans
On 01/29/2013 01:33 PM, Will McElderry wrote:
> Hi All,
>
> I'm attempting to use the GPIO pins on the Raspberry Pi to program a
> PIC24FJ32GB004, and struggling.
>
> I've had some success, but I can only clock out 0's from the Visi
> register (see note below).
>
> I am hoping that someone on here may be interested in my goal enough to
> lend me their knowledge and perhaps try running the code on their Pi to
> program a chip?
>
> Any comments on what may be wrong or ways to test further would be
> appreciated!
>
> The code is very basic and hacked together, it's C++ and easy enough to
> read.  I've compared with the usbpicprog code and I can't see any
> noticeable differences.
>
> I'll post more details if there's anyone interested.
>
> Thanks,
>
> Will McElderry.
>
> NB: I *believe* I am clocking out zeros from the register as PGD seems
> to accept current when the PIC should be transmitting data - indicating
> the PIC is intentionally holding the ping low.
> This was a fortuitous discovery thanks to only having access to an
> oscilloscope with one channel, and using a r/2r ladder to allow
> monitoring 3 pins at the same time. When PGD is not connected to either
> zero or one the output voltage on the channel changes noticeably, a
> state I have been able to induce intentionally by sending invalid
> commands to the PIC, or not requesting clocking out of the Visi
> register, but asking the Pi to try and read from the PGD pin.
>
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