How to embed user ID into PIC

[Acetronics2]

Hi,

From µChip MPLAB Programmers HELP :

ID Location : Program or verify the User ID. You can set the User ID by selecting Configure>ID Memory.

From '628 Datasheet

14.10 User ID Locations
Four memory locations (2000h-2003h) are designated
as user ID locations where the user can store
checksum or other code-identification numbers. These
locations are not accessible during normal execution
but are readable and writable during Program/Verify.
Only the Least Significant 4 bits of the user ID locations
are used for checksum calculations although each
location has 14 bits.

I'd recommend you to read The MPASM Help chapter relative to "__idlocs" ...

I will become obvious for you, then ... even if you have a "non µChip" programmer.

Alain

[mister_e]

Déja-vue

Writing User ID
http://www.picbasic.co.uk/forum/showthread.php?t=7644&

[Acetronics2]

deuhhh, yes there's an easier way.... Always nice to read MPASM PDF

Wasn't it called " RTFM " in the good ol' Forum times ...

Quand la censure ne coupait pas systématiquement tout ce qui pouvait ressembler à de l'humour ...

Mheuuuuunoon, je l'ai pas dit ...

Alain

[mister_e]

hasquetèkon

[Ioannis]

Now I would ask, how do you read these ID location in PBP?

Ioannis

[mister_e]

From MPASM

Usage
This directive is used in the following types of code: absolute or relocatable. For information on types of code, see Assembler Operation.

This directive is not commonly used, but does provide an easy method of serializing devices. __idlocs can be read by a programmer. PIC18 devices can read this value at run-time, but PIC12/16 devices cannot.

For PIC18, I guess Darrel have the right ticket for that. Something based around the following
http://www.picbasic.co.uk/forum/showthread.php?t=4093

[mister_e]

I found this snip on Microchip website

	// read serial number from PIC ID memory at address 0x200000 - 0x200007
	DWORD ReadIDMemory(void) {
	DWORD IdMemory=0;
	DWORD Temp;
	BYTE i;
	TBLPTR = (unsigned short long) 0x200000;

	for(i=0;i<8;i++) {
		_asm
		TBLRDPOSTINC
		_endasm
		Temp=TABLAT;
		Temp<<=((7-i)*4);
		 IdMemory+=Temp;
		}
	
	return IdMemory;
}