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Read #ID Checksum on dsPIC30F3011

 
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RNR107



Joined: 19 Dec 2014
Posts: 23

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Read #ID Checksum on dsPIC30F3011
PostPosted: Mon Mar 08, 2021 10:32 am     Reply with quote
Hi all,
I am trying to read the Checksum stored in the user #ID on a dsPIC30F3011.
My function looks like that:
Code:

#ID CHECKSUM
.
.
.
.
.
unsigned int16 Get_Checksum(void)
{
   unsigned int8 id[8];
   unsigned int n;
   unsigned int16 check_id = 0;

   read_program_memory(0x8005C0, id, sizeof(id) );
   for(n=0; n<=3; ++n)
   {
      check_id=check_id*16+(id[n*2] & 15);
   }
   return(check_id);
}


This code works fine on a dsPIC30F3012. But not on the 3011.
Is it on a different location on the 3011 ? I search through the datasheet but could not find the answer.

I am using compiler PCWHD Version 5.091

Thank you for any help.
RNR
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Mar 09, 2021 2:14 am     Reply with quote
Look on page 3 of the pdf below. This pdf covers the 3011.
It shows the Unit ID area is at 0x8005C0.

dsPIC30F Flash Programming Specification:
http://ww1.microchip.com/downloads/en/devicedoc/70102k.pdf\

Look at section 6.7 on page 21. It says a Bulk Erase will not erase
the Unit ID area. So potentially it could be a problem with your programmer
firmware.

How do you know the ID was written correctly ?
You could have the compiler read it with:

value = getenv("ID");
RNR107



Joined: 19 Dec 2014
Posts: 23

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PostPosted: Tue Mar 09, 2021 3:47 am     Reply with quote
Ha.... OK
In that case, I know why it doesn't work.
I have a bootloader on this PIC, therefore it doesn't get erased properly...

Thank you for help!
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