PIC bootloader project

[Ruudje]

Anyone interested in a project I've just started..

It concerns a PIC bootloader (RS232 19200BpS) (jawn) with the following features:

1 Software code memory protection (inside the PIC)
2 128 bytes pic code used
3 Resque mode (by pulling up the TxD line and resetting or powering up the PIC)
4 Win software contains disassembler for instant verifying of PIC code

What I have now
Working PIC source for the 16F series
Working win2K software incl disassembler for the 16F series

Regards
Ruud

 

[Nigel Goodwin]

Anyone interested in a project I've just started..

It concerns a PIC bootloader (RS232 19200BpS) (jawn) with the following features:

1 Software code memory protection (inside the PIC)
2 128 bytes pic code used
3 Resque mode (by pulling up the TxD line and resetting or powering up the PIC)
4 Win software contains disassembler for instant verifying of PIC code

What I have now
Working PIC source for the 16F series
Working win2K software incl disassembler for the 16F series

Hi Ruud,

It sounds a fairly standard bootloader system, with the exception of the disassembler - although that's not required for verification, and couldn't really be used for verification.

As the author of the longest running (first?) PIC disassembler I'd be interested to see what sort of code it produces.

 

[Neiwiertz]

We are two students from holland
At school we have just started a project (2 days)

The goal of the project is to make a standalone programmer for in the field. We are using for standalone programmer (source) and target device the 18F452. We planning that the source device contains in his memory the hex file for the target device.
We would like to use icsp for programming. This is the main goal. But the first task is to understand a bootloader. Any information is welcome!

Greetings Dennis en Sebastiaan

 

[Nigel Goodwin]

We are two students from holland
At school we have just started a project (2 days)

The goal of the project is to make a standalone programmer for in the field. We are using for standalone programmer (source) and target device the 18F452. We planning that the source device contains in his memory the hex file for the target device.
We would like to use icsp for programming. This is the main goal. But the first task is to understand a bootloader. Any information is welcome!

MicroChip have datasheets explaining the bootloading system for various devices (including the 18F452), it should explain everything you need to know.

But basically you just need an RS232 type serial connection, between two PIC's you can just use direct pin to pin connections and 5V levels. It's most common to use the hardware USART's where they are available, and suitable code is available to download at MicroChip.

You might also like to visit https://www.microchipc.com/PIC18bootload/ which looks helpful, I've used their 16F bootloader (which is excellent), presumably their 18F one will be good as well.

 

[Neiwiertz]

Thanks for your link