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serial bootloader

 
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kmp84



Joined: 02 Feb 2010
Posts: 354

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serial bootloader
PostPosted: Sat Mar 28, 2020 8:32 am     Reply with quote
Hello,

I'm using CCS's serial bootloader with pic18F45K22.
How to erase user program memory before load new hex file?

Something like this?

Code:
 

      printf("\r\nErasing flash on: %s!\r\n",getenv("DEVICE"));
     
      for(i=(LOADER_END+1); i<getenv("PROGRAM_MEMORY"); i+=getenv("FLASH_ERASE_SIZE")){   
         erase_program_eeprom(i);   // Erase User Flash memory!
      }



Best Regards!
Ttelmah



Joined: 11 Mar 2010
Posts: 19535

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PostPosted: Sat Mar 28, 2020 9:18 am     Reply with quote
You don't.

The normal write_program_memory function, will erase a
page when you write to the first byte in a page.
Quote:

Whenever this function is about to write to a location that is a multiple of FLASH_ERASE_SIZE then an erase is performed on the whole block.

The bootloader has a little extra code to deal with some special conditions,
but normally relies on this.
kmp84



Joined: 02 Feb 2010
Posts: 354

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PostPosted: Sat Mar 28, 2020 10:52 am     Reply with quote
Hi Mr.Ttelmah,

I'm searching method for calculating checksum for bootloader region and application region. That was purpose for clearing all application mem. region.

Thanks,
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