Saving a variable between power ups

[Roamin]

Hi,

I'm really confused right now. I've been trying for hours to have a variable saved across power ups but to no avail... I set the following :

int *Last_Tool = &persist.UserData[50];
The value starts at 0

Then later after manipulating the variables , it is set this way:

*Last_Tool = Index;

So now the value is set to my last position of my tool holder.

When I power up again , the variable is set to 0 again. How do I make it so that when it powers up , it will retain the last value that was stored in?

I'm really confused. Thanks for you help.

[TomKerekes]

Hi Roamin,

You can save the Current Tool to a PC Disk File to be recovered after a power loss.

See the GetCurrentTool() and SaveCurrentTool() in the Linear4ToolHolders Rev 2.c example

[Roamin]

Thanks for your input, Tom

Is there no way to directly save it to the flash memory of the Kflop ? Since everything program can be flashed to the Kflop, surely it's possible to save a single variable?

I will start looking into saving to disk, but it seems overkill to save a single byte?

Thanks

[TomKerekes]

In general if the system has a PC we recommend using the resources of the PC and leave KFLOP in its virgin state. Otherwise it can be confusing if KFLOPs are swapped or replaced. If you prefer to Flash data to KFLOP see the examples in the FlashNonVolatile folder.

[Roamin]

Thanks for that information. I have used the 2 functions you told me about and now my tool changer keeps track of its tool position after power off.