[SOLVED] Is an assignment to 8 bit-long variable on 8 bit processor always atomic?

Projects Programming
40

You don't have to use: #include <Arduino.h>

The Wire.readBytes() needs a cast to (byte *) for the first parameter.

I am not able to check if the buffer works in all circumstances with the ATOMIC blocks, volatile and static variables.

The normal way is:

volatile bool flag;
volatile struct myData ...

void loop()
{
  if (flag)
  {
    noInterrupts();
    make a copy of the data        // memcpy to local struct
    flag = false;
    interrupts();
    use the copy from now on
  }
}

It is just the data and the flag. That is easier to check in case of a bug.
The interrupt routine can check the flag and increase an error count if the flag was not cleared yet.