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Fix ibm4704 protocol with using interrupt
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,53 @@ | ||
#ifndef RING_BUFFER_H | ||
#define RING_BUFFER_H | ||
/*-------------------------------------------------------------------- | ||
* Ring buffer to store scan codes from keyboard | ||
*------------------------------------------------------------------*/ | ||
#define RBUF_SIZE 32 | ||
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) | ||
{ | ||
uint8_t sreg = SREG; | ||
cli(); | ||
uint8_t next = (rbuf_head + 1) % RBUF_SIZE; | ||
if (next != rbuf_tail) { | ||
rbuf[rbuf_head] = data; | ||
rbuf_head = next; | ||
} else { | ||
print("rbuf: full\n"); | ||
} | ||
SREG = sreg; | ||
} | ||
static inline uint8_t rbuf_dequeue(void) | ||
{ | ||
uint8_t val = 0; | ||
|
||
uint8_t sreg = SREG; | ||
cli(); | ||
if (rbuf_head != rbuf_tail) { | ||
val = rbuf[rbuf_tail]; | ||
rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE; | ||
} | ||
SREG = sreg; | ||
|
||
return val; | ||
} | ||
static inline bool rbuf_has_data(void) | ||
{ | ||
uint8_t sreg = SREG; | ||
cli(); | ||
bool has_data = (rbuf_head != rbuf_tail); | ||
SREG = sreg; | ||
return has_data; | ||
} | ||
static inline void rbuf_clear(void) | ||
{ | ||
uint8_t sreg = SREG; | ||
cli(); | ||
rbuf_head = rbuf_tail = 0; | ||
SREG = sreg; | ||
} | ||
|
||
#endif /* RING_BUFFER_H */ |
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