-/*\r
- LUFA Library\r
- Copyright (C) Dean Camera, 2009.\r
- \r
- dean [at] fourwalledcubicle [dot] com\r
- www.fourwalledcubicle.com\r
-*/\r
-\r
-/*\r
- Copyright 2009 Denver Gingerich (denver [at] ossguy [dot] com)\r
- Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
-\r
- Permission to use, copy, modify, distribute, and sell this \r
- software and its documentation for any purpose is hereby granted\r
- without fee, provided that the above copyright notice appear in \r
- all copies and that both that the copyright notice and this\r
- permission notice and warranty disclaimer appear in supporting \r
- documentation, and that the name of the author not be used in \r
- advertising or publicity pertaining to distribution of the \r
- software without specific, written prior permission.\r
-\r
- The author disclaim all warranties with regard to this\r
- software, including all implied warranties of merchantability\r
- and fitness. In no event shall the author be liable for any\r
- special, indirect or consequential damages or any damages\r
- whatsoever resulting from loss of use, data or profits, whether\r
- in an action of contract, negligence or other tortious action,\r
- arising out of or in connection with the use or performance of\r
- this software.\r
-*/\r
-\r
-/** Circular bit buffer library. This will allow for individual bits\r
- * to be stored in packed form inside circular buffers, to reduce\r
- * overall RAM usage.\r
- */\r
-\r
-#include "CircularBitBuffer.h"\r
-\r
-/** Function to initialize or reset a bit buffer, ready for data to be stored into it. */\r
-void BitBuffer_Init(BitBuffer_t* const Buffer)\r
-{\r
- /* Reset the number of stored bits in the buffer */\r
- Buffer->Elements = 0;\r
- \r
- /* Reset the data in and out pointer structures in the buffer to the first buffer bit */\r
- Buffer->In.CurrentByte = Buffer->Data;\r
- Buffer->In.ByteMask = (1 << 0);\r
- Buffer->Out.CurrentByte = Buffer->Data;\r
- Buffer->Out.ByteMask = (1 << 0);\r
-}\r
-\r
-/** Function to store the given bit into the given bit buffer. */\r
-void BitBuffer_StoreNextBit(BitBuffer_t* const Buffer, const bool Bit)\r
-{\r
- /* If the bit to store is true, set the next bit in the buffer */\r
- if (Bit)\r
- *Buffer->In.CurrentByte |= Buffer->In.ByteMask;\r
- \r
- /* Increment the number of stored bits in the buffer counter */\r
- Buffer->Elements++;\r
- \r
- /* Check if the current buffer byte is full of stored bits */\r
- if (Buffer->In.ByteMask == (1 << 7))\r
- {\r
- /* Check if the end of the buffer has been reached, if so reset to start of buffer, otherwise advance to next bit */\r
- if (Buffer->In.CurrentByte != &Buffer->Data[sizeof(Buffer->Data) - 1])\r
- Buffer->In.CurrentByte++;\r
- else\r
- Buffer->In.CurrentByte = Buffer->Data;\r
- \r
- /* Reset the storage bit mask in the current buffer byte to the first bit */ \r
- Buffer->In.ByteMask = (1 << 0);\r
- }\r
- else\r
- {\r
- /* Shift the current storage bit mask to the next bit in the current byte */\r
- Buffer->In.ByteMask <<= 1;\r
- }\r
-}\r
-\r
-/** Function to retrieve the next bit stored in the given bit buffer. */\r
-bool BitBuffer_GetNextBit(BitBuffer_t* const Buffer)\r
-{ \r
- /* Retrieve the value of the next bit stored in the buffer */\r
- bool Bit = ((*Buffer->Out.CurrentByte & Buffer->Out.ByteMask) != 0);\r
-\r
- /* Clear the buffer bit */\r
- *Buffer->Out.CurrentByte &= ~Buffer->Out.ByteMask;\r
-\r
- /* Decrement the number of stored bits in the buffer counter */\r
- Buffer->Elements--;\r
- \r
- /* Check if the current buffer byte is empty of stored bits */ \r
- if (Buffer->Out.ByteMask == (1 << 7))\r
- {\r
- /* Check if the end of the buffer has been reached, if so reset to start of buffer, otherwise advance to next bit */\r
- if (Buffer->Out.CurrentByte != &Buffer->Data[sizeof(Buffer->Data) - 1])\r
- Buffer->Out.CurrentByte++;\r
- else\r
- Buffer->Out.CurrentByte = Buffer->Data; \r
- \r
- /* Reset the retrieval bit mask in the current buffer byte to the first bit */ \r
- Buffer->Out.ByteMask = (1 << 0);\r
- }\r
- else\r
- {\r
- /* Shift the current retrieval bit mask to the next bit in the current byte */\r
- Buffer->Out.ByteMask <<= 1;\r
- }\r
-\r
- /* Return the retrieved bit from the buffer */\r
- return Bit;\r
-}\r
+/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2011.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2010 Denver Gingerich (denver [at] ossguy [dot] com)
+ Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, distribute, and sell this
+ software and its documentation for any purpose is hereby granted
+ without fee, 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.
+*/
+
+/** Circular bit buffer library. This will allow for individual bits
+ * to be stored in packed form inside circular buffers, to reduce
+ * overall RAM usage.
+ */
+
+#include "CircularBitBuffer.h"
+
+/** Function to initialize or reset a bit buffer, ready for data to be stored into it. */
+void BitBuffer_Init(BitBuffer_t* const Buffer)
+{
+ /* Reset the number of stored bits in the buffer */
+ Buffer->Elements = 0;
+
+ /* Reset the data in and out pointer structures in the buffer to the first buffer bit */
+ Buffer->In.CurrentByte = Buffer->Data;
+ Buffer->In.ByteMask = (1 << 0);
+ Buffer->Out.CurrentByte = Buffer->Data;
+ Buffer->Out.ByteMask = (1 << 0);
+}
+
+/** Function to store the given bit into the given bit buffer. */
+void BitBuffer_StoreNextBit(BitBuffer_t* const Buffer,
+ const bool Bit)
+{
+ /* If the bit to store is true, set the next bit in the buffer */
+ if (Bit)
+ *Buffer->In.CurrentByte |= Buffer->In.ByteMask;
+
+ /* Increment the number of stored bits in the buffer counter */
+ Buffer->Elements++;
+
+ /* Check if the current buffer byte is full of stored bits */
+ if (Buffer->In.ByteMask == (1 << 7))
+ {
+ /* Check if the end of the buffer has been reached, if so reset to start of buffer, otherwise advance to next bit */
+ if (Buffer->In.CurrentByte != &Buffer->Data[sizeof(Buffer->Data) - 1])
+ Buffer->In.CurrentByte++;
+ else
+ Buffer->In.CurrentByte = Buffer->Data;
+
+ /* Reset the storage bit mask in the current buffer byte to the first bit */
+ Buffer->In.ByteMask = (1 << 0);
+ }
+ else
+ {
+ /* Shift the current storage bit mask to the next bit in the current byte */
+ Buffer->In.ByteMask <<= 1;
+ }
+}
+
+/** Function to retrieve the next bit stored in the given bit buffer. */
+bool BitBuffer_GetNextBit(BitBuffer_t* const Buffer)
+{
+ /* Retrieve the value of the next bit stored in the buffer */
+ bool Bit = ((*Buffer->Out.CurrentByte & Buffer->Out.ByteMask) != 0);
+
+ /* Clear the buffer bit */
+ *Buffer->Out.CurrentByte &= ~Buffer->Out.ByteMask;
+
+ /* Decrement the number of stored bits in the buffer counter */
+ Buffer->Elements--;
+
+ /* Check if the current buffer byte is empty of stored bits */
+ if (Buffer->Out.ByteMask == (1 << 7))
+ {
+ /* Check if the end of the buffer has been reached, if so reset to start of buffer, otherwise advance to next bit */
+ if (Buffer->Out.CurrentByte != &Buffer->Data[sizeof(Buffer->Data) - 1])
+ Buffer->Out.CurrentByte++;
+ else
+ Buffer->Out.CurrentByte = Buffer->Data;
+
+ /* Reset the retrieval bit mask in the current buffer byte to the first bit */
+ Buffer->Out.ByteMask = (1 << 0);
+ }
+ else
+ {
+ /* Shift the current retrieval bit mask to the next bit in the current byte */
+ Buffer->Out.ByteMask <<= 1;
+ }
+
+ /* Return the retrieved bit from the buffer */
+ return Bit;
+}
+
projects / pub / USBasp.git / blobdiff