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General Bootloader Question

 
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newguy



Joined: 24 Jun 2004
Posts: 1909

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General Bootloader Question
PostPosted: Tue Dec 21, 2010 4:16 pm     Reply with quote
I've read through the CCS bootloader examples ex_bootloader.c and ex_bootload.c and I can understand the program flow. Where I get confused is if I use interrupts in my main program. What happens with them? Do these lines in ex_bootloader.c automatically "take care" of any interrupts I use in my main program so that the interrupts will "fire" normally without me having to do any #org-ing or anything out of the ordinary?

In the bootloader:
Code:
#int_global
void isr(void) {
   jump_to_isr(LOADER_END+5*(getenv("BITS_PER_INSTRUCTION")/8));
}


My main program:
Code:
#int_RDA
RDA_int() {
   data_received = TRUE;
}

#int_RTCC
RTCC_int() {
   timer_expired = TRUE;
}


Will these two interrupts "fire" when serial data is received by the UART and when timer 0 rolls over? Do I require anything more to assure that the interrupts don't get "lost"?
dbotkin



Joined: 08 Sep 2003
Posts: 197
Location: Omaha NE USA

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PostPosted: Tue Dec 21, 2010 4:21 pm     Reply with quote
Yep -- the bootloader relocates your ISR code to its new location and everything works as normal. I'm using a USB bootloader on one project, and a heavily customized one in another to load firmware fro a USB drive (via VNC1L chip). You pretty much never even know it's there.
newguy



Joined: 24 Jun 2004
Posts: 1909

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PostPosted: Thu Jan 06, 2011 4:53 pm     Reply with quote
Finally got around to this and you're right - very simple & transparent - just write a program like you would normally do, but include the bootloader header file.

Thanks!
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