delay.c

来自「GPS模块的相关资料」· C语言 代码 · 共 44 行

#include "delay.h"
#include "main.h"

void delay_1us(void)	//18
{
	asm("nop"::);
}

void delay_nus(volatile unsigned int t)	//53+16t 周期
{
	while(t--);
}


#if (FREQUENCY==1000000)
void delay_1ms(void)
{
	volatile int t=49;
	while(t--);
}

#elif (FREQUENCY==12000000)

void delay_1ms(void)
{
	volatile int t=745;
	while(t--);
}

#elif (FREQUENCY==8000000)
void delay_1ms(void)
{
	volatile int t=490;
	while(t--);
}

#endif

void delay_nms(volatile unsigned int t)
{
	while(t--)
		delay_1ms();
}