qmk_firmware/quantum/ring_buffer.h

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#pragma once
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#include <stdint.h>
#include <stdbool.h>
#include "atomic_util.h"
#ifndef RBUF_SIZE
# define RBUF_SIZE 32
#endif
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static uint8_t rbuf[RBUF_SIZE];
static uint8_t rbuf_head = 0;
static uint8_t rbuf_tail = 0;
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static inline bool rbuf_enqueue(uint8_t data) {
bool ret = false;
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
uint8_t next = (rbuf_head + 1) % RBUF_SIZE;
if (next != rbuf_tail) {
rbuf[rbuf_head] = data;
rbuf_head = next;
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ret = true;
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}
}
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return ret;
}
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static inline uint8_t rbuf_dequeue(void) {
uint8_t val = 0;
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
if (rbuf_head != rbuf_tail) {
val = rbuf[rbuf_tail];
rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE;
}
}
return val;
}
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static inline bool rbuf_has_data(void) {
bool has_data;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
has_data = (rbuf_head != rbuf_tail);
}
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return has_data;
}
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static inline void rbuf_clear(void) {
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
rbuf_head = rbuf_tail = 0;
}
}