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https://github.com/felis/USB_Host_Shield_2.0.git
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58 lines
2.6 KiB
C
58 lines
2.6 KiB
C
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/*
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* File: macros.h
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* Author: AJK
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*
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* Created on September 23, 2013, 12:31 AM
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*/
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#ifndef MACROS_H
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#define MACROS_H
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////////////////////////////////////////////////////////////////////////////////
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// HANDY MACROS
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////////////////////////////////////////////////////////////////////////////////
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#define SWAP(a, b) (((a) ^= (b)), ((b) ^= (a)), ((a) ^= (b)))
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#ifndef __BYTE_GRABBING_DEFINED__
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#define __BYTE_GRABBING_DEFINED__ 1
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#ifdef BROKEN_OPTIMIZER_LITTLE_ENDIAN
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// Note: Use this if your compiler generates horrible assembler!
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#define BGRAB0(__usi__) (((uint8_t *)&(__usi__))[0])
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#define BGRAB1(__usi__) (((uint8_t *)&(__usi__))[1])
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#define BGRAB2(__usi__) (((uint8_t *)&(__usi__))[2])
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#define BGRAB3(__usi__) (((uint8_t *)&(__usi__))[3])
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#define BGRAB4(__usi__) (((uint8_t *)&(__usi__))[4])
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#define BGRAB5(__usi__) (((uint8_t *)&(__usi__))[5])
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#define BGRAB6(__usi__) (((uint8_t *)&(__usi__))[6])
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#define BGRAB7(__usi__) (((uint8_t *)&(__usi__))[7])
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#else
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// Note: The cast alone to uint8_t is actually enough.
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// GCC throws out the "& 0xff", and the size is no different.
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// Some compilers need it.
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#define BGRAB0(__usi__) ((uint8_t)((__usi__) & 0xff ))
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#define BGRAB1(__usi__) ((uint8_t)(((__usi__) >> 8) & 0xff))
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#define BGRAB2(__usi__) ((uint8_t)(((__usi__) >> 16) & 0xff))
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#define BGRAB3(__usi__) ((uint8_t)(((__usi__) >> 24) & 0xff))
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#define BGRAB4(__usi__) ((uint8_t)(((__usi__) >> 32) & 0xff))
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#define BGRAB5(__usi__) ((uint8_t)(((__usi__) >> 40) & 0xff))
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#define BGRAB6(__usi__) ((uint8_t)(((__usi__) >> 48) & 0xff))
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#define BGRAB7(__usi__) ((uint8_t)(((__usi__) >> 56) & 0xff))
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#endif
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#define BOVER1(__usi__) ((uint16_t)(__usi__) << 8)
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#define BOVER2(__usi__) ((uint32_t)(__usi__) << 16)
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#define BOVER3(__usi__) ((uint32_t)(__usi__) << 24)
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#define BOVER4(__usi__) ((uint64_t)(__usi__) << 32)
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#define BOVER5(__usi__) ((uint64_t)(__usi__) << 40)
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#define BOVER6(__usi__) ((uint64_t)(__usi__) << 48)
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#define BOVER7(__usi__) ((uint64_t)(__usi__) << 56)
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// These are the smallest and fastest ways I have found so far in pure C/C++.
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#define BMAKE16(__usc1__,__usc0__) ((uint16_t)((uint16_t)(__usc0__) | (uint16_t)BOVER1(__usc1__)))
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#define BMAKE32(__usc3__,__usc2__,__usc1__,__usc0__) ((uint32_t)((uint32_t)(__usc0__) | (uint32_t)BOVER1(__usc1__) | (uint32_t)BOVER2(__usc2__) | (uint32_t)BOVER3(__usc3__)))
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#define BMAKE64(__usc7__,__usc6__,__usc5__,__usc4__,__usc3__,__usc2__,__usc1__,__usc0__) ((uint64_t)((uint64_t)__usc0__ | (uint64_t)BOVER1(__usc1__) | (uint64_t)BOVER2(__usc2__) | (uint64_t)BOVER3(__usc3__) | (uint64_t)BOVER4(__usc4__) | (uint64_t)BOVER5(__usc5__) | (uint64_t)BOVER6(__usc6__) | (uint64_t)BOVER1(__usc7__)))
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#endif
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#endif /* MACROS_H */
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