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Diffstat (limited to 'Demos/USBtoSerial/RingBuff.h')
| -rw-r--r-- | Demos/USBtoSerial/RingBuff.h | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/Demos/USBtoSerial/RingBuff.h b/Demos/USBtoSerial/RingBuff.h new file mode 100644 index 000000000..4b6bfde66 --- /dev/null +++ b/Demos/USBtoSerial/RingBuff.h @@ -0,0 +1,116 @@ +/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2009.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.fourwalledcubicle.com
+*/
+
+/*
+ Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, and distribute this software
+ and its documentation for any purpose and without fee is hereby
+ granted, provided that the above copyright notice appear in all
+ copies and that both that the copyright notice and this
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
+ software without specific, written prior permission.
+
+ The author disclaim all warranties with regard to this
+ software, including all implied warranties of merchantability
+ and fitness. In no event shall the author be liable for any
+ special, indirect or consequential damages or any damages
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+/* Buffer Configuration: */
+ /* Buffer length - select static size of created ringbuffers: */
+ #define BUFF_STATICSIZE 128 // Set to the static ringbuffer size for all ringbuffers (place size after define)
+
+ /* Volatile mode - uncomment to make buffers volatile, for use in ISRs, etc: */
+ #define BUFF_VOLATILE // Uncomment to cause all ring buffers to become volatile (and atomic if multi-byte) in access
+
+ /* Drop mode - select behaviour when Buffer_StoreElement called on a full buffer: */
+ #define BUFF_DROPOLD // Uncomment to cause full ring buffers to drop the oldest character to make space when full
+ // #define BUFF_DROPNEW // Uncomment to cause full ring buffers to drop the new character when full
+ // #define BUFF_NODROPCHECK // Uncomment to ignore full ring buffer checks - checking left to user!
+
+ /* Underflow behaviour - select behaviour when Buffer_GetElement is called with an empty ringbuffer: */
+ //#define BUFF_EMPTYRETURNSZERO // Uncomment to return 0 when an empty ringbuffer is read
+ #define BUFF_NOEMPTYCHECK // Uncomment to disable checking of empty ringbuffers - checking left to user!
+
+ /* Buffer storage type - set the datatype for the stored data */
+ #define BUFF_DATATYPE uint8_t // Change to the data type that is going to be stored into the buffer
+
+ /* Peek routine - uncomment to include the peek routine (fetches next byte without removing it from the buffer */
+ //#define BUFF_USEPEEK
+
+#ifndef _RINGBUFF_H_
+#define _RINGBUFF_H_
+
+ /* Includes: */
+ #include <avr/io.h>
+ #include <avr/interrupt.h>
+ #include <util/atomic.h>
+ #include <limits.h>
+
+ #include <LUFA/Common/Common.h>
+
+ /* Defines and checks: */
+ #if defined(BUFF_STATICSIZE)
+ #define BUFF_LENGTH BUFF_STATICSIZE
+ #else
+ #error No buffer length specified!
+ #endif
+
+ #if !(defined(BUFF_DROPOLD) || defined(BUFF_DROPNEW) || defined(BUFF_NODROPCHECK))
+ #error No buffer drop mode specified.
+ #endif
+
+ #if !defined(BUFF_DATATYPE)
+ #error Ringbuffer storage data type not specified.
+ #endif
+
+ #if defined(BUFF_VOLATILE)
+ #define BUFF_MODE volatile
+ #define BUFF_ATOMIC_BLOCK ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
+ #else
+ #define BUFF_MODE
+ #define BUFF_ATOMIC_BLOCK
+ #endif
+
+ #if (BUFF_STATICSIZE > LONG_MAX)
+ #define RingBuff_Elements_t uint64_t
+ #elif (BUFF_STATICSIZE > INT_MAX)
+ #define RingBuff_Elements_t uint32_t
+ #elif (BUFF_STATICSIZE > CHAR_MAX)
+ #define RingBuff_Elements_t uint16_t
+ #else
+ #define RingBuff_Elements_t uint8_t
+ #endif
+
+ /* Type Defines: */
+ typedef BUFF_DATATYPE RingBuff_Data_t;
+
+ typedef BUFF_MODE struct
+ {
+ RingBuff_Data_t Buffer[BUFF_LENGTH];
+ RingBuff_Data_t* InPtr;
+ RingBuff_Data_t* OutPtr;
+ RingBuff_Elements_t Elements;
+ } RingBuff_t;
+
+ /* Function Prototypes: */
+ void Buffer_Initialize(RingBuff_t* Buff);
+ void Buffer_StoreElement(RingBuff_t* Buffer, RingBuff_Data_t Data);
+ RingBuff_Data_t Buffer_GetElement(RingBuff_t* Buffer);
+ #if defined(BUFF_USEPEEK)
+ RingBuff_Data_t Buffer_PeekElement(const RingBuff_t* Buffer);
+ #endif
+
+#endif
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