SparkFun Forums

[pierscintilla]

Hi, I would like to modify the Logomatic bootloader.
I saw that Sparkfun no longer have in the catalog the programmer PGM-00714.
What low cost alternative I can use?

Many thanks in advance
Pier

[pierscintilla]

I think that I can use a USB/Serial FDI interface (full handshake) with the Flash Magic utility.

This solution, however, is valid only if the Sparkfun bootloader is a secondary bootloader otherwise I do not think I can use the ISP programming (you cannot overwrite the bootloader during its running).

Wanting to avoid to make the micro not ISP programmable, my first concern is then:
the Sparkfun bootloader is a secondary bootloader?

Still for the same reason, the second problem is that Flash Magic, before programming, asks which blocks of flash want to be erased or,
alternatively, proposes:
1) "Erase entire flash + Code Rd Prot"
2) "Erase blocks used by Hex file"
while in the advanced options, to the Security item, I have found "protect ISP code".

Then, to avoid damaging the primary bootloader, I can erase the entire flash with the "protect ISP code" option selected or what settings I
should use?

Many thanks in advance
Pier