Writing & Reading 2 Bytes to/from Flash

[Zebryk]

Hello,

I want to store and recall 2 Bytes from Flash on a PIC18F27J13 for pairing up a remote control to a mobile unit.
These are RadioID(RF Address) and RadioCH (Channel#) which are both just 8 bit VARs each.
I think I have the basic idea as below but I cannot figure out how to configure Flash programming.
The (2) memory locations ($1800 and $1900) I picked as it looks like my main code is way below.

Although I think this wastes a whole 64Byte block per each, I do not care at the moment.
I did try setting the above VARs to Words instead of Bytes but that did not help.
Reading through various posts I think I need to define an area of memory for these (2) bytes and un-protect them from being written to. However, I have be unable to find any simple examples and am stumped.

Thanks,


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'' Flash Experiments


Flash:


If Push = 0 Then ' Should Increment ID & CH by 1
Pause 10
If Push = 1 Then ' Noise
Return
EndIf
Do
Pause 10
Loop Until Push = 1 ' Wait for User Release
GLED = 1
EraseCode $1800 ' Whole Block of 4 Words $1800 to $1864?
EraseCode $1900
RadioID = RadioID + 1
RadioCH = RadioCH + 1
WriteCode $1803, RadioID ' Writes to 4th Word in Block
WriteCode $1903, RadioCH
ReadCode $1803, RadioID ' Reads from 4th Word in Block
ReadCode $1903, RadioCH
hserout2["RadioID: ", dec RadioID, 13,10]
hserout2["RadioCH: ", dec RadioCH, 13,10]
GLED = 0
EndIf


GoTo Flash


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[aerostar]

Melabs manual says

Flash program writes must be enabled in the configuration for the PICmicro MCU at device programming time for ERASECODE to be able to erase.

Have you done this when programming the pic?

[Zebryk]

I have looked high and low but cannot see where this is set.
What exactly is this called and where can I find it?

(I have the U2 Programmer with version 4.51.)

[richard]

its in the hardware configuration registers (fuse settings)

WPFP = PAGE_0
WPCFG = OFF
WPDIS = OFF
WPEND = PAGE_WPFP

shown here with default pbp values (no code protection )
it does help if you post you whole code (in code tags) not just snippets, and include what version of pbp used

[Zebryk]

Richard,

I tried your suggestion but it did not work.
As my whole code is >73,000 characters it will not post.
I am using PBPX 3.0.7.4
The PIC is a PIC18F27J13.

Is my syntax / technique correct?

Thanks,

[richard]

what syntax ? at no stage have you posted the relevant config fuse settings you have employed.

why not make a small pgm to test the idea