diff options
| author | Dean Camera <dean@fourwalledcubicle.com> | 2009-02-23 07:08:17 +0000 |
|---|---|---|
| committer | Dean Camera <dean@fourwalledcubicle.com> | 2009-02-23 07:08:17 +0000 |
| commit | 9991321321d30ca9383d795ea7e796098c92045f (patch) | |
| tree | cd3bd40eef421cc83c9d63e58f5def8a233acab6 /Demos/USBtoSerial/RingBuff.c | |
| parent | c1a1b6eeecb375259968ef6d989833312047f2d8 (diff) | |
| download | lufa-9991321321d30ca9383d795ea7e796098c92045f.tar.gz lufa-9991321321d30ca9383d795ea7e796098c92045f.tar.bz2 lufa-9991321321d30ca9383d795ea7e796098c92045f.zip | |
Moved all source to the trunk directory.
Diffstat (limited to 'Demos/USBtoSerial/RingBuff.c')
| -rw-r--r-- | Demos/USBtoSerial/RingBuff.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/Demos/USBtoSerial/RingBuff.c b/Demos/USBtoSerial/RingBuff.c new file mode 100644 index 000000000..1f477f17a --- /dev/null +++ b/Demos/USBtoSerial/RingBuff.c @@ -0,0 +1,120 @@ +/*
+ 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.
+*/
+
+#include "RingBuff.h"
+
+void Buffer_Initialize(RingBuff_t* Buffer)
+{
+ BUFF_ATOMIC_BLOCK
+ {
+ Buffer->InPtr = (RingBuff_Data_t*)&Buffer->Buffer;
+ Buffer->OutPtr = (RingBuff_Data_t*)&Buffer->Buffer;
+ Buffer->Elements = 0;
+ }
+}
+
+void Buffer_StoreElement(RingBuff_t* Buffer, RingBuff_Data_t Data)
+{
+ BUFF_ATOMIC_BLOCK
+ {
+ #if defined(BUFF_DROPOLD)
+ if (Buffer->Elements == BUFF_LENGTH)
+ {
+ Buffer->OutPtr++;
+
+ if (Buffer->OutPtr == &Buffer->Buffer[BUFF_LENGTH])
+ Buffer->OutPtr = (RingBuff_Data_t*)&Buffer->Buffer;
+ }
+ else
+ {
+ Buffer->Elements++;
+ }
+ #elif defined(BUFF_DROPNEW)
+ if (Buffer->Elements == BUFF_LENGTH)
+ return;
+
+ Buffer->Elements++;
+ #elif defined(BUFF_NODROPCHECK)
+ Buffer->Elements++;
+ #endif
+
+ *(Buffer->InPtr) = Data;
+ Buffer->InPtr++;
+
+ if (Buffer->InPtr == &Buffer->Buffer[BUFF_LENGTH])
+ Buffer->InPtr = (RingBuff_Data_t*)&Buffer->Buffer;
+ }
+}
+
+RingBuff_Data_t Buffer_GetElement(RingBuff_t* Buffer)
+{
+ RingBuff_Data_t BuffData;
+
+ BUFF_ATOMIC_BLOCK
+ {
+#if defined(BUFF_EMPTYRETURNSZERO)
+ if (!(Buffer->Elements))
+ return 0;
+#elif !defined(BUFF_NOEMPTYCHECK)
+ #error No empty buffer check behaviour specified.
+#endif
+
+ BuffData = *(Buffer->OutPtr);
+
+ Buffer->OutPtr++;
+ Buffer->Elements--;
+
+ if (Buffer->OutPtr == &Buffer->Buffer[BUFF_LENGTH])
+ Buffer->OutPtr = (RingBuff_Data_t*)&Buffer->Buffer;
+ }
+
+ return BuffData;
+}
+
+#if defined(BUFF_USEPEEK)
+RingBuff_Data_t Buffer_PeekElement(const RingBuff_t* Buffer)
+{
+ RingBuff_Data_t BuffData;
+
+ BUFF_ATOMIC_BLOCK
+ {
+#if defined(BUFF_EMPTYRETURNSZERO)
+ if (!(Buffer->Elements))
+ return 0;
+#elif !defined(BUFF_NOEMPTYCHECK)
+ #error No empty buffer check behaviour specified.
+#endif
+
+ BuffData = *(Buffer->OutPtr);
+ }
+
+ return BuffData;
+}
+#endif
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