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tmk_keyboard_custom/ring_buffer.h
tmk 4d116a04e9 Squashed 'tmk_core/' changes from b9e0ea0..caca2c0
caca2c0 Add mouse support to ADB
5b0835a Merge commit '1fe4406f374291ab2e86e95a97341fd9c475fcb8'
f2f7556 Remove unneeded tap delays #201
8124195 Fix URL of HID Usage Tables pdf
0bb4679 Fix typo of doc/keycode.txt
b24fa1a Fix handling of consumer usage #199
6ae1a3d Improve anti-ghosting behavior for fast typing
a4c9763 Fix dfu-programmer parameters
b62b3f2 Move ring_buffer.h file
6ec424f Fix debug print
502fb0c Fix ibm4704 protocol with using interrupt

git-subtree-dir: tmk_core
git-subtree-split: caca2c01553394d959550034c817520d575c7fa0
2015-04-28 11:27:10 +09:00

54 lines
1.2 KiB
C

#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 */