Bootloader for 16f87/88 that doesn't use UART

[bcd]

ROMzap - http://piclist.com/images/com/bubble...mo/ROMzap.html

Looks pretty advanced for what I need - it seems to use UART, although it does support the 16F872 which doesn't have a UART.

I am downloading it now and will dig in to the Source files (if they are in the ZIP) to see how customisable it will be.

So has anyone ever written a bootloader in PBP??

bill.

[victorf57]

Take a look at this code maybe it will help.
http://www.oshonsoft.com/picbootloader.html
victor

[bcd]

Hi Victor,

Fantastic ! That gives me a good starting point. The PC applicatin looks a lot like the PIC_E one.

Looks like I am going to spend Sunday in the shed learning how to bootload !!

With Thanks,
Bill.

[Darrel Taylor]

bcd,

If you're going to start with that bootloader for the 16F877?
There are some significant differences when writing to flash memory on the 16F87/88's.

The 877 allows you to write 1 word at a time. And when you write it, the chip automatically erases the word before writing the new data. This is the main reason why 99% of the free bootloaders use the 16F877. (it's easy)

The 16F87/88's require that you erase memory in blocks of 32-words first, then write the new data in blocks of 4-words. (more difficult)

It's still very doable.
Just thought it might help get you on the right track.
<br>

[ardhuru]

ROMzap - http://piclist.com/images/com/bubble...mo/ROMzap.html

Looks pretty advanced for what I need - it seems to use UART, although it does support the 16F872 which doesn't have a UART.

I am downloading it now and will dig in to the Source files (if they are in the ZIP) to see how customisable it will be.

bill.

Yes, the interface does look a bit complex first, but thats because its so configurable. Once you figure out the things you need, its a breeze to use. No it doesnt use the UART; you could use any pin for the bit banging.

Pity it only supports the 16F8XX chips, though; if you are able to adapt it for others, I would love to hear about it too... it was my preferred bootloader for a long time, till I had to switch over to the one from Mecanique. I still miss the flexibility and the option of not having to use a level shifter.

Regards,

Anand

[dhouston]

So has anyone ever written a bootloader in PBP??

See http://www.picbasic.co.uk/forum/showthread.php?t=4498