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Starting with bootloader

 
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E_Blue



Joined: 13 Apr 2011
Posts: 417

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Starting with bootloader
PostPosted: Sun Dec 27, 2020 11:12 am     Reply with quote

Hello I'm trying to understand how bootloader works on PIC&CCS.
I already have a huge program with no bootloader running on a PIC18F67J50 and now I need to add a bootloader.

1) If the bootloader needs to access USB and a I2C memory the bootloader must have their owns routines?
I think yes, because the main program will be erased.

2)What about the interrupts vectors? How they works when the main program run and how when the bootloader runs?

Also I tried to move the program to a higher address without luck.

Code:
#include <18F67J50.h>
#fuses INTRC_PLL,PLL2,NOCPUDIV,NOIESO,NOFCMEN,STVREN,CCP2E7,NOWDT,WDT2048,PROTECT //WDT8Seg. No crystal

#build(reset=0x200:0x207, interrupt=0x208:0x2ff)
#build(memory=0x2000:0x2FFF)
//#ROM 0 = {0xFFFF}     // Insert NOP at address 0

void main()
{
   char buffer[64];
   
   setup_oscillator(OSC_PLL_ON|OSC_NORMAL);
   read_program_memory(0x0000, buffer, 64);
   delay_cycles(1);
   delay_cycles(1);
   write_program_memory(0x1000, buffer, 64);
   delay_cycles(1);
   delay_cycles(1);
   
   while(1)
   {
      delay_cycles(1);
      delay_cycles(1);
      
   }
   
}


Now I'm using a PIC18F67J50 but probably also will need to use the same bootloader with a PIC24FJ1024GB606.
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Electric Blue
Ttelmah



Joined: 11 Mar 2010
Posts: 19488

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PostPosted: Sun Dec 27, 2020 12:09 pm     Reply with quote

Yes.

Normally you don't use interrupts in the bootloader. Instead poll
the interrupt flags. Otherwise it gets awkward.
The bootloader revectors the interrupts for the main code.

A program moved to a higher address, cannot run without the bootloader
loaded to handle jumping to it on boot and revectoring the interrupts.
E_Blue



Joined: 13 Apr 2011
Posts: 417

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PostPosted: Sun Dec 27, 2020 12:35 pm     Reply with quote

How I can use USB CDC CCS library with the bootloader?

I mean it must have separated routines.
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Electric Blue
Ttelmah



Joined: 11 Mar 2010
Posts: 19488

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PostPosted: Sun Dec 27, 2020 12:50 pm     Reply with quote

The USB CDC library, offers an option to poll rather than use the
interrupt. Look at the example USB bootloader.
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