#ifndef RING_BUFFER_H #define RING_BUFFER_H /*-------------------------------------------------------------------- * Ring buffer to store scan codes from keyboard *------------------------------------------------------------------*/ #define RBUF_SIZE 32 #include static uint8_t rbuf[RBUF_SIZE]; static uint8_t rbuf_head = 0; static uint8_t rbuf_tail = 0; static inline void rbuf_enqueue(uint8_t data) { ATOMIC_BLOCK(ATOMIC_RESTORESTATE) { uint8_t next = (rbuf_head + 1) % RBUF_SIZE; if (next != rbuf_tail) { rbuf[rbuf_head] = data; rbuf_head = next; } else { print("rbuf: full\n"); } } } 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; } } #endif /* RING_BUFFER_H */ ng-4.0'>staging-4.0 xenJames
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