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i need to add values continuously to a fixed size fifo array
You also need code to remove the oldest element from the buffer, right? (else it won't be "fixed size" :D.
simplest would be to keep a fixed size array in a shift register and keep track of the insert point. Read the oldest value from the insert point before overwriting it with the newest value. There is also the data queue ptbypt tool. What have you tried so far?