demo of driving MAX2719 dot matrix displays with STM32F103 Bluepill
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f103-dotmatrix/project/utils/meanbuf.h

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/**
* @file meanbuf.h
* @author Ondřej Hruška, 2016
*
* Averaging float buffer. (You can adjust it to use doubles, if you prefer.)
*
* The meanbuf_create() function allocates a buffer.
*
* You can then call meanbuf_add() to add a new value into the buffer (and remove the oldest).
* This function returns the current average value.
*
* This buffer can be used for signal smoothing (such as from an analogue sensor).
*
* MIT license
*/
#pragma once
#include <stdlib.h>
#include <stdint.h>
typedef struct meanbuf_struct MeanBuf;
/** Init a buffer */
MeanBuf *meanbuf_create(size_t size);
/** Deinit a buffer (free buffer array) */
void meanbuf_destroy(MeanBuf *mb);
/** Add a value to the buffer. Returns current mean. */
float meanbuf_add(MeanBuf *mb, float f);
float meanbuf_current(MeanBuf *bm);