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/*
* @brief Common ring buffer support functions
*
* @note
* Copyright(C) NXP Semiconductors, 2012
* All rights reserved.
*
* @par
* Software that is described herein is for illustrative purposes only
* which provides customers with programming information regarding the
* LPC products. This software is supplied "AS IS" without any warranties of
* any kind, and NXP Semiconductors and its licensor disclaim any and
* all warranties, express or implied, including all implied warranties of
* merchantability, fitness for a particular purpose and non-infringement of
* intellectual property rights. NXP Semiconductors assumes no responsibility
* or liability for the use of the software, conveys no license or rights under any
* patent, copyright, mask work right, or any other intellectual property rights in
* or to any products. NXP Semiconductors reserves the right to make changes
* in the software without notification. NXP Semiconductors also makes no
* representation or warranty that such application will be suitable for the
* specified use without further testing or modification.
*
* @par
* Permission to use, copy, modify, and distribute this software and its
* documentation is hereby granted, under NXP Semiconductors' and its
* licensor's relevant copyrights in the software, without fee, provided that it
* is used in conjunction with NXP Semiconductors microcontrollers. This
* copyright, permission, and disclaimer notice must appear in all copies of
* this code.
*/
#include "ring_buffer.h"
/*****************************************************************************
* Private types/enumerations/variables
****************************************************************************/
/*****************************************************************************
* Public types/enumerations/variables
****************************************************************************/
/*****************************************************************************
* Private functions
****************************************************************************/
/*****************************************************************************
* Public functions
****************************************************************************/
/* Initialize ring buffer */
void RingBuffer_Init(RINGBUFF_T *RingBuff, void *buffer, int itemSize, int count)
{
RingBuff->bufferBase = RingBuff->bufferIn = RingBuff->bufferOut = buffer;
RingBuff->bufferLast = RingBuff->bufferBase + (itemSize * count);
RingBuff->count = count;
RingBuff->itemSize = itemSize;
RingBuff->used = 0;
}
/* Return empty status of ring buffer */
bool RingBuffer_Insert8(RINGBUFF_T *RingBuff, uint8_t data8)
{
bool full = RingBuffer_IsFull(RingBuff);
if (!full) {
*RingBuff->bufferIn = data8;
RingBuff->used++;
RingBuff->bufferIn++;
if (RingBuff->bufferIn >= RingBuff->bufferLast) {
RingBuff->bufferIn = RingBuff->bufferBase;
}
}
return (bool) !full;
}
/* Insert 16-bit value in ring buffer */
bool RingBuffer_Insert16(RINGBUFF_T *RingBuff, uint16_t data16)
{
bool full = RingBuffer_IsFull(RingBuff);
if (!full) {
uint16_t *buff16 = (uint16_t *) RingBuff->bufferIn;
*buff16 = data16;
RingBuff->used++;
buff16++;
RingBuff->bufferIn = (uint8_t *) buff16;
if (RingBuff->bufferIn >= RingBuff->bufferLast) {
RingBuff->bufferIn = RingBuff->bufferBase;
}
}
return (bool) !full;
}
/* Insert 32-bit value in ring buffer */
bool RingBuffer_Insert32(RINGBUFF_T *RingBuff, uint32_t data32)
{
bool full = RingBuffer_IsFull(RingBuff);
if (!full) {
uint32_t *buff32 = (uint32_t *) RingBuff->bufferIn;
*buff32 = data32;
RingBuff->used++;
buff32++;
RingBuff->bufferIn = (uint8_t *) buff32;
if (RingBuff->bufferIn >= RingBuff->bufferLast) {
RingBuff->bufferIn = RingBuff->bufferBase;
}
}
return (bool) !full;
}
/* Pop a 8-bit value from the ring buffer */
bool RingBuffer_Pop8(RINGBUFF_T *RingBuff, uint8_t *data8)
{
bool empty = RingBuffer_IsEmpty(RingBuff);
if (!empty) {
*data8 = *RingBuff->bufferOut;
RingBuff->used--;
RingBuff->bufferOut++;
if (RingBuff->bufferOut >= RingBuff->bufferLast) {
RingBuff->bufferOut = RingBuff->bufferBase;
}
}
return (bool) !empty;
}
/* Pop a 16-bit value from the ring buffer */
bool RingBuffer_Pop16(RINGBUFF_T *RingBuff, uint16_t *data16)
{
bool empty = RingBuffer_IsEmpty(RingBuff);
if (!empty) {
uint16_t *buff16 = (uint16_t *) RingBuff->bufferOut;
*data16 = *buff16;
RingBuff->used--;
buff16++;
RingBuff->bufferOut = (uint8_t *) buff16;
if (RingBuff->bufferOut >= RingBuff->bufferLast) {
RingBuff->bufferOut = RingBuff->bufferBase;
}
}
return (bool) !empty;
}
/* Pop a 32-bit value from the ring buffer */
bool RingBuffer_Pop32(RINGBUFF_T *RingBuff, uint32_t *data32)
{
bool empty = RingBuffer_IsEmpty(RingBuff);
if (!empty) {
uint32_t *buff32 = (uint32_t *) RingBuff->bufferOut;
*data32 = *buff32;
RingBuff->used--;
data32++;
RingBuff->bufferOut = (uint8_t *) data32;
if (RingBuff->bufferOut >= RingBuff->bufferLast) {
RingBuff->bufferOut = RingBuff->bufferBase;
}
}
return (bool) !empty;
}
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