Heater/heater3/fifo.h

#ifndef FIFO_H_
#define FIFO_H_

#include <stdint.h>

//ðàçìåð äîëæåí áûòü ñòåïåíüþ äâîéêè: 4,8,16,32...128
#define FIFO( size )\
struct {\
	uint8_t buf[size];\
	uint16_t tail;\
	uint16_t head;\
}

//êîëè÷åñòâî ýëåìåíòîâ â î÷åðåäè
#define FIFO_COUNT(fifo)     (fifo.head-fifo.tail)

//ðàçìåð fifo
#define FIFO_SIZE(fifo)      ( sizeof(fifo.buf) / sizeof(fifo.buf[0]) )

//fifo çàïîëíåíî?
#define FIFO_IS_FULL(fifo)   (FIFO_COUNT(fifo)==FIFO_SIZE(fifo))

//fifo ïóñòî?
#define FIFO_IS_EMPTY(fifo)  (fifo.tail==fifo.head)

//êîëè÷åñòâî ñâîáîäíîãî ìåñòà â fifo
#define FIFO_SPACE(fifo)     (FIFO_SIZE(fifo)-FIFO_COUNT(fifo))

//ïîìåñòèòü ýëåìåíò â fifo
#define FIFO_PUSH(fifo, byte) \
{\
	fifo.buf[fifo.head & (FIFO_SIZE(fifo)-1)]=byte;\
	fifo.head++;\
}

//âçÿòü ïåðâûé ýëåìåíò èç fifo
#define FIFO_FRONT(fifo) (fifo.buf[fifo.tail & (FIFO_SIZE(fifo)-1)])

//óìåíüøèòü êîëè÷åñòâî ýëåìåíòîâ â î÷åðåäè
#define FIFO_POP(fifo)   \
{\
	fifo.tail++; \
}

//î÷èñòèòü fifo
#define FIFO_FLUSH(fifo)   \
{\
	fifo.tail=0;\
	fifo.head=0;\
}

#endif /* FIFO_H_ */