From 74298f8ca11dc8d3b0359d1d4e124d6494c3eeac Mon Sep 17 00:00:00 2001 From: Nicolas Schodet Date: Fri, 10 Apr 2009 01:15:42 +0200 Subject: * digital/avr/modules/usb: - imported LUFA. --- .../usb/lufa/Projects/AVRISP_Programmer/RingBuff.c | 120 +++++++++++++++++++++ 1 file changed, 120 insertions(+) create mode 100644 digital/avr/modules/usb/lufa/Projects/AVRISP_Programmer/RingBuff.c (limited to 'digital/avr/modules/usb/lufa/Projects/AVRISP_Programmer/RingBuff.c') diff --git a/digital/avr/modules/usb/lufa/Projects/AVRISP_Programmer/RingBuff.c b/digital/avr/modules/usb/lufa/Projects/AVRISP_Programmer/RingBuff.c new file mode 100644 index 00000000..1f477f17 --- /dev/null +++ b/digital/avr/modules/usb/lufa/Projects/AVRISP_Programmer/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 -- cgit v1.2.3