[tmk_keyboard.git] / tmk_core / ring_buffer.h

#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 */
Commit	Line	Data
d42aa478	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 */