Edit flash/EEPROM in MPLABX

[Pommie]

I'm trying to edit the flash memory in a pic16F18854 - flash goes from zero to 0fff (4k). I've reserved the last 1k (0c00-0fff) by setting the memory model (in linker) to exclude the area,

I've also told pickit4 to preserve this area by doing,

I can change location 0c00 but there is no way to write it to the device.

I can read the device memory but if I then try to edit the flash it tells me,

I have done multiple "Debug Builds" to no avail.

Am I missing something? Does anyone know how to do this?

Anyone wondering the project is called read_vdd.

Mike.

 

[rjenkinsgb]

Turn off the restrictions for one build, and add an include file with the data you want to store??

eg. This is how I save to flash in one of my projects:

#ORG 0x00020000
#include "w:\Projects\!!!includes\Images\image_header.txt"
#include "w:\Projects\!!!includes\Images\jrw_logo_16.txt"
...

The header starts with

ROM BYTE bmp_images[] = {

to define the storage as in flash.

Or, use the MCUs write to flash instruction and have your program initialise the area if the correct data does not exist - eg. use "magic numbers" before and after to validate it, and/or add a CRC check.

 

[Pommie]

I didn't know #org existed. I'll give it a try.

Thanks,

Mike.

 

[Pommie]

#org isn't valid in XC8. Just spent over an hour trying to find out how you store data in flash. Many people have asked the question but no answer.

Mike.

 

[rjenkinsgb]

How about making the data to be stored CONST so it's allocated to flash, then getting that address from the linker map to use for non-writing versions?

Or, as I said earlier, add a routine to initialise the flash data area if it does not exist?

Apparently XC8 does not have native routines to write program memory, but it's possible by adding assembler routines - some outline examples here:

PIC12F(1572) Flash Read/Write Routines? | Microchip

I'm using the new PIC12F1572 device and need some non-volatile data storage. This device lacks EEPROM so I need to use flash instead. I can write my own flash access routines using the supplied documentation but thought I would first ask if there are any Microchip supplied routines avail...

www.microchip.com