📄 delay.h
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#ifndef __ASM_ARM_DELAY_H#define __ASM_ARM_DELAY_H/* * Copyright (C) 1995 Russell King * * Delay routines, using a pre-computed "loops_per_second" value. */extern void __delay(int loops);/* * division by multiplication: you don't have to worry about * loss of precision. * * Use only for very small delays ( < 1 msec). Should probably use a * lookup table, really, as the multiplications take much too long with * short delays. This is a "reasonable" implementation, though (and the * first constant multiplications gets optimized away if the delay is * a constant) */extern void udelay(unsigned long usecs);static inline unsigned long muldiv(unsigned long a, unsigned long b, unsigned long c){ return a * b / c;} #endif /* defined(_ARM_DELAY_H) */
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