timer.c

共享几个AVR单片机的常用代码

#include "Timer.h"

volatile uint16_t WaitTimer;
extern volatile uint16_t waitFlag;

ISR(TIMER0_COMP_vect)
{
	if(--WaitTimer == 0)
	{
		TCCR0 = 0;
		TIMSK &= 0xFD;
	}
}

ISR(TIMER2_COMP_vect)
{
	if(--waitFlag == 0)
	{
		TCCR2 = 0;
		TIMSK &= 0x7F;
	}
}

void Timer_Set_us(uint16_t t)
{
	waitFlag = 1;
	TCNT2	= 0;
	if(t < 5)
	{
		DELAY_8M_us;
		DELAY_8M_us;
		waitFlag = 0;
	}
	else if(t < 256)
	{
		OCR2	= t;
		TCCR2	= 0x0A;
	}
	else if(t < 4096)
	{
		OCR2	= (t>>3);
		TCCR2	= 0x0B;
	}
	else
	{
		OCR2	= (t>>8);
		TCCR2	= 0x0C;
	}
	TIMSK	|= 0x80;
}

void Timer_Set_ms(uint16_t t)
{
	waitFlag = t*4;
	
	OCR2	= 250;
	TCCR2	= 0x0A;

	TIMSK	|= 0x80;
}

void Timer_Set_s(uint16_t t)
{
	waitFlag = 4000 * t;
	
	OCR2	= 250;
	TCCR2	= 0x0A;

	TIMSK	|= 0x80;
}

void Timer_Wait_us(uint16_t t)
{
	WaitTimer = 1;
	TCNT0	= 0;
	if(t < 5)
	{
		DELAY_8M_us;
		DELAY_8M_us;
		WaitTimer = 0;
	}
	else if(t < 256)
	{
		OCR0	= t;
		TCCR0	= 0x0A;
	}
	else if(t < 4096)
	{
		OCR0	= (t>>3);
		TCCR0	= 0x0B;
	}
	else
	{
		OCR0	= (t>>8);
		TCCR0	= 0x0C;
	}
	TIMSK	|= 0x02;

	while(WaitTimer);
}

void Timer_Wait_ms(uint16_t t)	//limited to 10000ms
{
	WaitTimer = t*4;
	
	OCR0	= 250;
	TCCR0	= 0x0A;

	TIMSK	|= 0x02;
	
	while(WaitTimer);
}

void Timer_Wait_s(uint16_t t)	//limited to 16s
{
	WaitTimer = 4000 * t;
	
	OCR0	= 250;
	TCCR0	= 0x0A;

	TIMSK	|= 0x02;
	
	while(WaitTimer);

}