Commit c2e34032 authored by Dean Camera's avatar Dean Camera
Browse files

Document lightweight ring buffer header files.

parent 2dabb4e5
This diff is collapsed.
......@@ -37,51 +37,81 @@
#define _ULW_RING_BUFF_H_
/* Includes: */
#include <util/atomic.h>
#include <stdint.h>
#include <stdbool.h>
/* Defines: */
/** Size of each ring buffer, in bytes. */
/** Size of each ring buffer, in data elements - must be between 1 and 255. */
#define BUFFER_SIZE 128
/** Type of data to store into the buffer. */
#define RingBuff_Data_t uint8_t
/* Type Defines: */
/** Type define for a new ring buffer object. Buffers should be initialized via a call to
* \ref RingBuffer_InitBuffer() before use.
*/
typedef struct
{
RingBuff_Data_t Buffer[BUFFER_SIZE];
RingBuff_Data_t* In;
RingBuff_Data_t* Out;
uint8_t Count;
RingBuff_Data_t Buffer[BUFFER_SIZE]; /**< Internal ring buffer data, referenced by the buffer pointers. */
RingBuff_Data_t* In; /**< Current storage location in the circular buffer */
RingBuff_Data_t* Out; /**< Current retrieval location in the circular buffer */
uint8_t Count; /**< Total number of bytes stored in the circular buffer */
} RingBuff_t;
/* Inline Functions: */
/** Initializes a ring buffer ready for use. Buffers must be initialized via this function
* before any operations are called upon them. Already initialized buffers may be reset
* by re-initializing them using this function.
*
* \ref Buffer Pointer to a ring buffer structure to initialize
*/
static inline void RingBuffer_InitBuffer(RingBuff_t* const Buffer)
{
Buffer->In = Buffer->Buffer;
Buffer->Out = Buffer->Buffer;
Buffer->In = Buffer->Buffer;
Buffer->Out = Buffer->Buffer;
Buffer->Count = 0;
}
/** Inserts an element into the ring buffer.
*
* \ref Buffer Pointer to a ring buffer structure to insert into
* \ref Data Data element to insert into the buffer
*/
static inline void RingBuffer_Insert(RingBuff_t* const Buffer, RingBuff_Data_t Data)
{
*Buffer->In = Data;
if (++Buffer->In == &Buffer->Buffer[BUFFER_SIZE])
Buffer->In = Buffer->Buffer;
Buffer->Count++;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
{
*Buffer->In = Data;
if (++Buffer->In == &Buffer->Buffer[BUFFER_SIZE])
Buffer->In = Buffer->Buffer;
Buffer->Count++;
}
}
/** Retrieves an element from the ring buffer.
*
* \ref Buffer Pointer to a ring buffer structure to retrieve from
*
* \return Next data element stored in the buffer
*/
static inline RingBuff_Data_t RingBuffer_Remove(RingBuff_t* const Buffer)
{
RingBuff_Data_t Data = *Buffer->Out;
if (++Buffer->Out == &Buffer->Buffer[BUFFER_SIZE])
Buffer->Out = Buffer->Buffer;
Buffer->Count--;
RingBuff_Data_t Data;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
{
Data = *Buffer->Out;
if (++Buffer->Out == &Buffer->Buffer[BUFFER_SIZE])
Buffer->Out = Buffer->Buffer;
Buffer->Count--;
}
return Data;
}
......
......@@ -37,51 +37,81 @@
#define _ULW_RING_BUFF_H_
/* Includes: */
#include <util/atomic.h>
#include <stdint.h>
#include <stdbool.h>
/* Defines: */
/** Size of each ring buffer, in bytes */
/** Size of each ring buffer, in data elements - must be between 1 and 255. */
#define BUFFER_SIZE 128
/** Type of data to store into the buffer */
/** Type of data to store into the buffer. */
#define RingBuff_Data_t uint8_t
/* Type Defines: */
/** Type define for a new ring buffer object. Buffers should be initialized via a call to
* \ref RingBuffer_InitBuffer() before use.
*/
typedef struct
{
RingBuff_Data_t Buffer[BUFFER_SIZE];
RingBuff_Data_t* In;
RingBuff_Data_t* Out;
uint8_t Count;
RingBuff_Data_t Buffer[BUFFER_SIZE]; /**< Internal ring buffer data, referenced by the buffer pointers. */
RingBuff_Data_t* In; /**< Current storage location in the circular buffer */
RingBuff_Data_t* Out; /**< Current retrieval location in the circular buffer */
uint8_t Count; /**< Total number of bytes stored in the circular buffer */
} RingBuff_t;
/* Inline Functions: */
/** Initializes a ring buffer ready for use. Buffers must be initialized via this function
* before any operations are called upon them. Already initialized buffers may be reset
* by re-initializing them using this function.
*
* \ref Buffer Pointer to a ring buffer structure to initialize
*/
static inline void RingBuffer_InitBuffer(RingBuff_t* const Buffer)
{
Buffer->In = Buffer->Buffer;
Buffer->Out = Buffer->Buffer;
Buffer->In = Buffer->Buffer;
Buffer->Out = Buffer->Buffer;
Buffer->Count = 0;
}
/** Inserts an element into the ring buffer.
*
* \ref Buffer Pointer to a ring buffer structure to insert into
* \ref Data Data element to insert into the buffer
*/
static inline void RingBuffer_Insert(RingBuff_t* const Buffer, RingBuff_Data_t Data)
{
*Buffer->In = Data;
if (++Buffer->In == &Buffer->Buffer[BUFFER_SIZE])
Buffer->In = Buffer->Buffer;
Buffer->Count++;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
{
*Buffer->In = Data;
if (++Buffer->In == &Buffer->Buffer[BUFFER_SIZE])
Buffer->In = Buffer->Buffer;
Buffer->Count++;
}
}
/** Retrieves an element from the ring buffer.
*
* \ref Buffer Pointer to a ring buffer structure to retrieve from
*
* \return Next data element stored in the buffer
*/
static inline RingBuff_Data_t RingBuffer_Remove(RingBuff_t* const Buffer)
{
RingBuff_Data_t Data = *Buffer->Out;
if (++Buffer->Out == &Buffer->Buffer[BUFFER_SIZE])
Buffer->Out = Buffer->Buffer;
Buffer->Count--;
RingBuff_Data_t Data;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
{
Data = *Buffer->Out;
if (++Buffer->Out == &Buffer->Buffer[BUFFER_SIZE])
Buffer->Out = Buffer->Buffer;
Buffer->Count--;
}
return Data;
}
......
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