delay.c

测试LCM模块AVR应用

/* ========================================================================== */
/*                                                                            */
/*   delay.c                                                                  */
/*   Author: ljune                                                     */
/*   Version: 1.0.0                                                           */
/*   Date Created: 2006/05/31                                                 */
/*   Last Modified: 2006/05/31                                                */
/*   Description: Delay function for 8051 serial MCU                          */
/*                                                                            */
/* ========================================================================== */

// Delay function for 8051 system (Fosc = 8MHz)

// Delay microsecond less than 255us
void DelayUs(uint8 Tus)
{
	// If Tus >= 18, the delay is precise, otherwise not!
	if (Tus > 17)
	{
		Tus = Tus/2 - 9;
		if (Tus != 0)
			while(--Tus != 0);
	}
}

// Delay Tms ms
void DelayMs(uint16 Tms)
{
	uint8 i;
	while(Tms-- != 0)
	{
		i = 4;
		while(i-- != 0)
		DelayUs(250);
	}
}

// Delay 4us
void delay4us(void)
{
 	// 4us delay
}

// Delay 100ms
void delay100ms(void)
{
	DelayMs(100);
}

// Delay 500ms
void delay500ms(void)
{
	DelayMs(500);
}

// Delay 1s
void delay1s(void)
{
	DelayMs(1000);
}