delay.h

来自「* Use 10 MHz crystal frequency. * Use 」· C头文件 代码 · 共 56 行

#ifndef DELAY_H
#define DELAY_H 

#define	FOSC	29490L	 /* Internal clock freq in KHZ*/
#define	MHZ	*1000L	 /* number of kHz in a MHz */
#define	KHZ	*1	 /* number of kHz in a kHz */


#define	DelayUs(x) { unsigned char _dcnt; \
		     _dcnt = ((x* FOSC)/(12MHZ)); \
		     while(--_dcnt != 0) \
		       continue; }

char kill_delay;

void DelayMs(unsigned char cnt)
{
	unsigned char	i;
	do {
		i = 20;
		do {
			DelayUs(50);
		} while(--i);
	} while(--cnt);
}

// use this function when need a delay loop from an ISR
// should not usually delay within an ISR but if you have too.....
void ISR_DelayMs(unsigned char cnt)
{
	unsigned char	i;
	do {
		i = 20;
		do {
			DelayUs(50);
		} while(--i);
	} while(--cnt);
}

void DelayMsKill(unsigned char cnt)
{
	unsigned char	i;
	do {
		i = 20;
		do {
			DelayUs(50);
		} while(--i && !kill_delay);
	} while(--cnt && !kill_delay);
}

extern void DelayMs(unsigned char);


#endif