3 /*--------------------------------------------------------------------
4 * Ring buffer to store scan codes from keyboard
5 *------------------------------------------------------------------*/
7 #include <util/atomic.h>
8 static uint8_t rbuf
[RBUF_SIZE
];
9 static uint8_t rbuf_head
= 0;
10 static uint8_t rbuf_tail
= 0;
11 static inline void rbuf_enqueue(uint8_t data
)
13 ATOMIC_BLOCK(ATOMIC_RESTORESTATE
) {
14 uint8_t next
= (rbuf_head
+ 1) % RBUF_SIZE
;
15 if (next
!= rbuf_tail
) {
16 rbuf
[rbuf_head
] = data
;
19 print("rbuf: full\n");
23 static inline uint8_t rbuf_dequeue(void)
26 ATOMIC_BLOCK(ATOMIC_RESTORESTATE
) {
28 if (rbuf_head
!= rbuf_tail
) {
29 val
= rbuf
[rbuf_tail
];
30 rbuf_tail
= (rbuf_tail
+ 1) % RBUF_SIZE
;
36 static inline bool rbuf_has_data(void)
39 ATOMIC_BLOCK(ATOMIC_RESTORESTATE
) {
40 has_data
= (rbuf_head
!= rbuf_tail
);
44 static inline void rbuf_clear(void)
46 ATOMIC_BLOCK(ATOMIC_RESTORESTATE
) {
47 rbuf_head
= rbuf_tail
= 0;
51 #endif /* RING_BUFFER_H */