#ifndef _delay_h_#define _delay_h_#include <inttypes.h>#include <avr/io.h>#ifndef F_OSC#define F_OSC	3686400#endif/* delay function for microsec   4 cpu cycles per loop + 1 cycles(?) overhead    when a constant is passed. */static inline void delayloop16(uint16_t count){	asm volatile (  "cp  %A0,__zero_reg__ \n\t"  \                     "cpc %B0,__zero_reg__ \n\t"  \                     "breq L_Exit_%=       \n\t"  \                     "L_LOOP_%=:           \n\t"  \                     "sbiw %0,1            \n\t"  \                     "brne L_LOOP_%=       \n\t"  \                     "L_Exit_%=:           \n\t"  \                     : "=w" (count)					 : "0"  (count)                   );                            }// delayloop16(x) eats 4 cycles per x#define DELAY_US_CONV(us) ((uint16_t)(((((us)*1000L)/(1000000000/F_OSC))-1)/4))#define delay_us(us)	  delayloop16(DELAY_US_CONV(us))/* delay function for millisec  (6 cycles per x + 20(?) overhead) */void delayloop32( uint32_t l); // not inline#define DELAY_MS_CONV(ms) ( (uint32_t) (ms*(F_OSC/6000L)) ) #define delay_ms(ms)  delayloop32(DELAY_MS_CONV(ms))/* mth 9/04:   Remark uSeconds:   Main Oscillator Clock given by F_OSC (makefile) in Hz   one CPU-Cycle takes 1/F_OSC seconds => 1000000/F_OSC uSeconds   so: 1 uSecond takes F_OSC/1000000 CPU-Cyles. The following code   is inspired by the avr-libc delay_loop2 function.   This it not "that precise" since it takes at least 4 cycles   but should be o.k. with any parameter (even 0).   Call function with delayloop(DELAYUS(dt [in uSeconds])).*/ #endif