Bob Axtell wrote:
> In the last two days, a potential client has requested something
> unusual. He asked if there is a way to include the PIC programmer
> INSIDE the product PCB.

I would first would first try to solve this with a bootloader.

> The idea is that he wants the PIC firmware to be update-able without any
> external hardware (such as a PIC programmer).

How does he want this to connect to the PC for programming?  RS-232, USB,
ethernet, something else?

> Of course the bootloader came to mind, but PICs don't have an internal
> bootloader,
> so the "bootloader code" have to be programmed in anyway; so his
> suggestion overrides
> the input.

I don't understand this.  The bootloader and the initial version of the
operational code would be programmed during manufacturing where a PIC
programmer can be used.  After that the customer can do field upgrades using
the bootloader.  What am I missing?

> use the FT232R with pins arranged in bit-bang mode.

That's one way, but probably more software work than you imagine right now.

I've designed a few PIC programmers with various different electrical drives
of the programming lines and different interfaces to the PC.  I've got
something like 20K lines of software and firmware already written.  Perhaps
I can take care of this susbsystem for you?  There are many possible ways to
proceed, but they all come down to I've got some wheels you don't have to
reinvent.  I can make better recommendations after knowing the target PIC,
where power comes from during programming, PC interface, etc.  This is best
discussed interactively.  I'll try to call you after I get back from a
customer around 16:00 eastern time.


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