stm32f103 neopixel demo simulating water / waving based on ultrasonic stimulus. This is an earlier version of what later became the "spatial-rgb" project
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f103-wave-sim/project/utils/circbuf.h

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/**
* @file circbuf.h
* @author Ondřej Hruška, 2016
*
* Circular buffer / queue / stack.
* Slots are pre-allocated, values are copied into the buffer.
*
* The buffer may be used as a stack, event queue or a simple buffer.
*
* -------------------------------------
*
* NW LR
* append -> [][][][] -> pop
* <- push
*
* NW - next write pointer (stack base)
* LR - last read position (stack top)
*
* -------------------------------------
*
* MIT license
*/
#pragma once
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
typedef struct circbuf_struct CircBuf;
/**
* @brief Initialize a circular buffer. The buffer is malloc'd.
* @param capacity : buffer capacity
* @param elem_size : size of one element
* @return pointer to the buffer instance
*/
CircBuf *cbuf_create(size_t capacity, size_t elem_size);
/**
* @brief Destroy a buffer, freeing used memory.
*
* @attention
* If the buffer items have malloc'd members, you have
* to free them manually to avoid a memory leak.
*
* @param cb : buffer
*/
void cbuf_destroy(CircBuf *cb);
/** Test for full buffer */
bool cbuf_full(const CircBuf *cb);
/** Test for empty buffer */
bool cbuf_empty(const CircBuf *cb);
/**
* @brief Append a value to the buffer (FIFO)
* @param cb : buffer
* @param source : pointer to a value (will be copied)
* @return success
*/
bool cbuf_append(CircBuf *cb, const void *source);
/**
* @brief Push a value into the circbuf (LIFO).
*
* @param cb : buffer
* @param source : pointer to a value (will be copied)
* @return success
*/
bool cbuf_push(CircBuf *cb, const void *source);
/**
* @brief Read a value from the buffer, return susccess.
*
* @param cb : buffer
* @param dest : read destionation. If NULL, value is discarded.
* @return success
*/
bool cbuf_pop(CircBuf *cb, void *dest);
/** @brief Remove all data from buffer */
void cbuf_clear(CircBuf *cb);