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 */