| | 1 | #ifndef RING_BUFFER_H |
| | 2 | #define RING_BUFFER_H |
| | 3 | /*-------------------------------------------------------------------- |
| | 4 | * Ring buffer to store scan codes from keyboard |
| | 5 | *------------------------------------------------------------------*/ |
| | 6 | #define RBUF_SIZE 32 |
| | 7 | static uint8_t rbuf[RBUF_SIZE]; |
| | 8 | static uint8_t rbuf_head = 0; |
| | 9 | static uint8_t rbuf_tail = 0; |
| | 10 | static inline void rbuf_enqueue(uint8_t data) |
| | 11 | { |
| | 12 | uint8_t sreg = SREG; |
| | 13 | cli(); |
| | 14 | uint8_t next = (rbuf_head + 1) % RBUF_SIZE; |
| | 15 | if (next != rbuf_tail) { |
| | 16 | rbuf[rbuf_head] = data; |
| | 17 | rbuf_head = next; |
| | 18 | } else { |
| | 19 | print("rbuf: full\n"); |
| | 20 | } |
| | 21 | SREG = sreg; |
| | 22 | } |
| | 23 | static inline uint8_t rbuf_dequeue(void) |
| | 24 | { |
| | 25 | uint8_t val = 0; |
| | 26 | |
| | 27 | uint8_t sreg = SREG; |
| | 28 | cli(); |
| | 29 | if (rbuf_head != rbuf_tail) { |
| | 30 | val = rbuf[rbuf_tail]; |
| | 31 | rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE; |
| | 32 | } |
| | 33 | SREG = sreg; |
| | 34 | |
| | 35 | return val; |
| | 36 | } |
| | 37 | static inline bool rbuf_has_data(void) |
| | 38 | { |
| | 39 | uint8_t sreg = SREG; |
| | 40 | cli(); |
| | 41 | bool has_data = (rbuf_head != rbuf_tail); |
| | 42 | SREG = sreg; |
| | 43 | return has_data; |
| | 44 | } |
| | 45 | static inline void rbuf_clear(void) |
| | 46 | { |
| | 47 | uint8_t sreg = SREG; |
| | 48 | cli(); |
| | 49 | rbuf_head = rbuf_tail = 0; |
| | 50 | SREG = sreg; |
| | 51 | } |
| | 52 | |
| | 53 | #endif /* RING_BUFFER_H */ |
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