ringbuf.c File Reference

#include "ringbuf.h"

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Functions
I16 ICACHE_FLASH_ATTR	RINGBUF_Init (RINGBUF *r, U8 *buf, I32 size)
	init a RINGBUF object More...
I16 ICACHE_FLASH_ATTR	RINGBUF_Put (RINGBUF *r, U8 c)
	put a character into ring buffer More...
I16 ICACHE_FLASH_ATTR	RINGBUF_Get (RINGBUF *r, U8 *c)
	get a character from ring buffer More...

Detailed Description

Ring Buffer library

Definition in file ringbuf.c.

Function Documentation

RINGBUF_Get()

I16 ICACHE_FLASH_ATTR RINGBUF_Get	(	RINGBUF *	r,
		U8 *	c
	)

get a character from ring buffer

Parameters

r	pointer to a ringbuf object
c	read character

Returns

0 if successfull, otherwise failed

Definition at line 53 of file ringbuf.c.

References RINGBUF::fill_cnt, RINGBUF::p_o, RINGBUF::p_r, and RINGBUF::size.

Referenced by PROTO_ParseRb().

{
    if(r->fill_cnt<=0)return -1;                // ring buffer is empty, this should be atomic operation
    

    r->fill_cnt--;                              // decrease filled slots count

    
    *c = *r->p_r++;                             // get the character out
    
    if(r->p_r >= r->p_o + r->size)              // rollback if write pointer go pass
        r->p_r = r->p_o;                        // the physical boundary
    
    return 0;
}

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RINGBUF_Init()

I16 ICACHE_FLASH_ATTR RINGBUF_Init	(	RINGBUF *	r,
		U8 *	buf,
		I32	size
	)

init a RINGBUF object

Parameters

r	pointer to a RINGBUF object
buf	pointer to a byte array
size	size of buf

Returns

0 if successfull, otherwise failed

Definition at line 16 of file ringbuf.c.

References RINGBUF::fill_cnt, NULL, RINGBUF::p_o, RINGBUF::p_r, RINGBUF::p_w, and RINGBUF::size.

Referenced by QUEUE_Init().

{
    if(r == NULL || buf == NULL || size < 2) return -1;
    
    r->p_o = r->p_r = r->p_w = buf;
    r->fill_cnt = 0;
    r->size = size;
    
    return 0;
}

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RINGBUF_Put()

I16 ICACHE_FLASH_ATTR RINGBUF_Put	(	RINGBUF *	r,
		U8	c
	)

put a character into ring buffer

Parameters

r	pointer to a ringbuf object
c	character to be put

Returns

0 if successfull, otherwise failed

Definition at line 32 of file ringbuf.c.

References RINGBUF::fill_cnt, RINGBUF::p_o, RINGBUF::p_w, and RINGBUF::size.

Referenced by PROTO_AddRb().

{
    if(r->fill_cnt>=r->size)return -1;      // ring buffer is full, this should be atomic operation
    

    r->fill_cnt++;                          // increase filled slots count, this should be atomic operation

    
    *r->p_w++ = c;                          // put character into buffer
    
    if(r->p_w >= r->p_o + r->size)          // rollback if write pointer go pass
        r->p_w = r->p_o;                    // the physical boundary
    
    return 0;
}

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