data synchronization without using semapore in C

Question

I need to have data synchronization in my code. Currently I am accessing a global value inside interrupt and also in a local function which may corrupt the data if interrup

Answer 1

It's probably as simple as this in your main code:

disable_interrupts();
value += 1;
enable_interrupts();

So you make sure the interrupt cannot fire while you're using the value in the main code.