* Ring buffer to store scan codes from keyboard
*------------------------------------------------------------------*/
#define RBUF_SIZE 32
+#include <util/atomic.h>
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();
+ ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
uint8_t next = (rbuf_head + 1) % RBUF_SIZE;
if (next != rbuf_tail) {
rbuf[rbuf_head] = data;
} else {
print("rbuf: full\n");
}
- SREG = sreg;
+ }
}
static inline uint8_t rbuf_dequeue(void)
{
uint8_t val = 0;
+ ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
- 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;
+ bool has_data;
+ ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
+ has_data = (rbuf_head != rbuf_tail);
+ }
+ return has_data;
}
static inline void rbuf_clear(void)
{
- uint8_t sreg = SREG;
- cli();
+ ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
rbuf_head = rbuf_tail = 0;
- SREG = sreg;
+ }
}
#endif /* RING_BUFFER_H */