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