/*
 * FIFO_COM.c
 *
 *  Created on: 14 mai 2019
 *      Author: e_rcluze
 */

#include "FIFO_COM.h"

void initFIFO(FIFO_COM *f){
	f->pt_read = 0;
	f->pt_write = 0;
}

uint8_t readFirst(FIFO_COM *f) {
	return f->Fifo[f->pt_read];
}

void readFifo(FIFO_COM *f, uint8_t *r, uint8_t nb) {
	for (uint8_t i = 0; i < nb;i++) {
		if (f->pt_read + i >= NBFIFO)
			r[i] = f->Fifo[f->pt_read + i - NBFIFO];
		else
			r[i] = f->Fifo[f->pt_read + i];
	}
	if (f->pt_read + nb >= NBFIFO)
		f->pt_read = f->pt_read + nb - NBFIFO;
	else
		f->pt_read = f->pt_read + nb;
}

void writeFifo(FIFO_COM *f, uint8_t *r, uint8_t nb) {
	uint8_t i;
	for (i = 0; i < nb;i++) {
		if (f->pt_write + i >= NBFIFO)
			f->Fifo[f->pt_write + i - NBFIFO] = r[i];
		else
			f->Fifo[f->pt_write + i] = r[i];
	}
	if (f->pt_write + nb >= NBFIFO)
		f->pt_write = f->pt_write + nb - NBFIFO;
	else
		f->pt_write = f->pt_write + nb;
}

uint8_t FIFO_nbRead(FIFO_COM *f) {
	if (f->pt_read <= f->pt_write)
		return f->pt_write - f->pt_read;
	else
		return f->pt_write + NBFIFO - f->pt_read;
}