12f675_fuse_about_to_blow!

[LEDave]

So the next thing it to WRITE 'Total' to EEPROM address, then READ that value and put it back into 'Total'.

The theory is that when the PIC power supply is turned off then restarted last 'Total' reappears on the LCD.

Dave

[mackrackit]

Yup, that is the mission

[LEDave]

From the manual:

 WRITE Address,Value

So looking at the 16F684.PDF it says:

The PIC16F684 has 256 bytes of data EEPROM
with an address range from 0h to FFh.

So would:

WRITE 0h,Total

work? Not quite as simple as that he says! For one thing these are EEPROM BYTES and 'Total' is a WORD two BYTES for a starter.

Dvae

[mackrackit]

You do not need to use HEX numbers for the address, PBP takes care of that.

http://www.melabs.com/resources/samples.htm
Might find the above .... interesting

[LEDave]

Mmm. Well I kind of think I know what I have to do, it's break the VAR WORD Total up into two BYTES, allocate them each a memory space B1 & B1+1 (from the prog below) WRITE the BYTES to the memory locations then READ them back.

        INCLUDE "modedefs.bas"          ' Include serial modes

SO      VAR		PORTC.6					' Define serial output pin

B1      VAR     BYTE					' Address variable
W2      VAR     WORD					' Data variable


mainloop:   

		For B1 = 0 To 12 step 2			' Step 2 because each word requires 2 bytes of memory
        	W2 = B1 + 1000          	' Add 1000 to address
        	Write B1, W2.HIGHBYTE		' Write high byte of word
        	Write B1+1, W2.LOWBYTE		' Write low byte of word to next address
		Next B1

		For B1 = 0 To 12 step 2			' Step 2 to get word size data
        	Read B1, W2.HIGHBYTE		' Read high byte
        	Read B1+1, W2.LOWBYTE		' Read low byte
        	SerOut SO,T2400,[#W2," ",10,13]	' Display the word data
		Next B1
		
        SerOut SO,T2400,[10,13,10,13] 	' Skip 2 Lines

        GoTo mainloop                       ' Forever

My reading of the program above is that B1 = 's ( 0,2,4,6,8,10,12) + 1000 this is then written and read from memory location B1 & B1+1 into WORD W2 am I close?

Dave

[mackrackit]

My reading of the program above is that B1 = 's ( 0,2,4,6,8,10,12) + 1000 this is then written and read from memory location B1 & B1+1 into WORD W2 am I close?

Sounds like you understand it. Have you tried it yet?

[LEDave]

Sounds like you understand it. Have you tried it yet?

I'm on it.......