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
) {
12 ATOMIC_BLOCK(ATOMIC_RESTORESTATE
) {
13 uint8_t next
= (rbuf_head
+ 1) % RBUF_SIZE
;
14 if (next
!= rbuf_tail
) {
15 rbuf
[rbuf_head
] = data
;
18 print("rbuf: full\n");
22 static inline uint8_t rbuf_dequeue(void) {
24 ATOMIC_BLOCK(ATOMIC_RESTORESTATE
) {
25 if (rbuf_head
!= rbuf_tail
) {
26 val
= rbuf
[rbuf_tail
];
27 rbuf_tail
= (rbuf_tail
+ 1) % RBUF_SIZE
;
33 static inline bool rbuf_has_data(void) {
35 ATOMIC_BLOCK(ATOMIC_RESTORESTATE
) { has_data
= (rbuf_head
!= rbuf_tail
); }
38 static inline void rbuf_clear(void) {
39 ATOMIC_BLOCK(ATOMIC_RESTORESTATE
) { rbuf_head
= rbuf_tail
= 0; }
42 #endif /* RING_BUFFER_H */