basic bootloader question

jma_1 · Joined: 08 Feb 2005 Posts: 147 Location: Wisconsin

Greetings,
I have a few questions on the bootloader example. The ex_bootloader.c example uses a #int_global for redefinition of interrupt routines. How would you include / change this to use serial interrupts (load code based on messages)? How do you combine serial routines in your application? Thanks in advance for any thoughts.

JMA

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Not sure what you want to do. Look at the Flash.c code posted in
this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=7791

Guest · Posted: Fri May 20, 2005 10:32 am

Thanks for the post. I wasn't clear on the application. I would like to have the ability to load code into the pic through the serial port when it receives a command (serial). Your posting (link to post w/ code) looks promising. Just to double check that I'm understanding your code, the code acts as a bootloader and is embedded inside the application code. Does the hex file need to parsed when sent by the pc application? As I'm a newbie to pics, what potential items will I need to changes will I need to make to work with the 18f458? Thanks again for the information.

JMA

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Yes, it does. There's a Visual Basic program that goes with the PIC code.
http://www.ccsinfo.com/forum/viewtopic.php?t=10534&start=0

It sounds like you want to send a HEX file directly to the PIC, perhaps
from a terminal program. In that case, the bootloader must parse
the HEX file. My bootloader code doesn't do that, since the parsing
is done by the VB program.

You should probably look at the CCS example files for a bootloader.
I think they may be closer to what you want. Here are the filenames
and their locations:

c:\program files\picc\examples\ex_bootload.c
c:\program files\picc\examples\ex_bootloader.c
c:\program files\picc\drivers\bootloader.c
c:\program files\picc\drivers\loader.c

jma_1 · Joined: 08 Feb 2005 Posts: 147 Location: Wisconsin

Does the VB program use the same parsing which the loader.c uses? If I opt to use the ccs example bootloader, I'm not sure how to change the #int_global definition and the nop within the interrupt routine to use serial interrupts for entering boot mode based on a command received. Questions: (if I go w/ bootloader) how to make the ex_bootloader.c work with receiving a command through the serial port to enter boot mode? If I use serial communication in my application (loaded with bootloader), how to combine both serial routines? Thanks in advance.