clamp.i

saving energy clamping program saving more than while sentence

/*************************Copyright(c)***************************
***************************File Info********************************
** File name:		efficiency.c
** Created by:		邵峰
** Descriptions:	         按键钳位程序，不同于while的钳位，它能提高CPU 的执行效率
** Date:                   2008-11-28
*******************************************************************/
// CodeVisionAVR C Compiler
// (C) 1998-2001 Pavel Haiduc, HP InfoTech S.R.L.

// I/O registers definitions for the ATmega16


#pragma used+
#pragma used+
sfrb TWBR=0;
sfrb TWSR=1;
sfrb TWAR=2;
sfrb TWDR=3;
sfrb ADCL=4;
sfrb ADCH=5;
sfrw ADCW=4;      // 16 bit access
sfrb ADCSRA=6;
sfrb ADMUX=7;
sfrb ACSR=8;
sfrb UBRRL=9;
sfrb UCSRB=0xa;
sfrb UCSRA=0xb;
sfrb UDR=0xc;
sfrb SPCR=0xd;
sfrb SPSR=0xe;
sfrb SPDR=0xf;
sfrb PIND=0x10;
sfrb DDRD=0x11;
sfrb PORTD=0x12;
sfrb PINC=0x13;
sfrb DDRC=0x14;
sfrb PORTC=0x15;
sfrb PINB=0x16;
sfrb DDRB=0x17;
sfrb PORTB=0x18;
sfrb PINA=0x19;
sfrb DDRA=0x1a;
sfrb PORTA=0x1b;
sfrb EECR=0x1c;
sfrb EEDR=0x1d;
sfrb EEARL=0x1e;
sfrb EEARH=0x1f;
sfrw EEAR=0x1e;   // 16 bit access
sfrb UBRRH=0x20;
sfrb UCSRC=0X20;
sfrb WDTCR=0x21;
sfrb ASSR=0x22;
sfrb OCR2=0x23;
sfrb TCNT2=0x24;
sfrb TCCR2=0x25;
sfrb ICR1L=0x26;
sfrb ICR1H=0x27;
sfrb OCR1BL=0x28;
sfrb OCR1BH=0x29;
sfrw OCR1B=0x28;  // 16 bit access
sfrb OCR1AL=0x2a;
sfrb OCR1AH=0x2b;
sfrw OCR1A=0x2a;  // 16 bit access
sfrb TCNT1L=0x2c;
sfrb TCNT1H=0x2d;
sfrw TCNT1=0x2c;  // 16 bit access
sfrb TCCR1B=0x2e;
sfrb TCCR1A=0x2f;
sfrb SFIOR=0x30;
sfrb OSCCAL=0x31;
sfrb OCDR=0x31;
sfrb TCNT0=0x32;
sfrb TCCR0=0x33;
sfrb MCUCSR=0x34;
sfrb MCUCR=0x35;
sfrb TWCR=0x36;
sfrb SPMCR=0x37;
sfrb TIFR=0x38;
sfrb TIMSK=0x39;
sfrb GIFR=0x3a;
sfrb GICR=0x3b;
sfrb OCR0=0X3c;
sfrb SPL=0x3d;
sfrb SPH=0x3e;
sfrb SREG=0x3f;
#pragma used-

// Interrupt vectors definitions


// Needed by the power management functions (sleep.h)
#asm
	#ifndef __SLEEP_DEFINED__
	#define __SLEEP_DEFINED__
	.EQU __se_bit=0x40
	.EQU __sm_mask=0xB0
	.EQU __sm_powerdown=0x20
	.EQU __sm_powersave=0x30
	.EQU __sm_standby=0xA0
	.EQU __sm_ext_standby=0xB0
	.EQU __sm_adc_noise_red=0x10
	.SET power_ctrl_reg=mcucr
	#endif
#endasm


// CodeVisionAVR C Compiler
// (C) 1998-2000 Pavel Haiduc, HP InfoTech S.R.L.


#pragma used+
#pragma used+

void delay_us(unsigned int n);
void delay_ms(unsigned int n);

#pragma used-

//#include"sf.h"               
unsigned char              keymark=0;//一次按键响应封锁标志     
/********************************************************************
** 函数名称 ：port_init()
** 函数功能 ：端口初始化
** 入口参数 ：无
** 出口参数 ：无
********************************************************************/
 void port_init(void)                       // the initialization function
{
           PORTA = 0x00;             	//设全为低
           DDRA  = 0xFF;                     //设置为输出
           PORTB = 0xFF;			//B口对应数码管7端控制端，且共阳极，若给低一开始便导通，因此置高
           DDRB  = 0xFF;                     //设置为输出
           PORTC = 0xFF;                     //set the default
           DDRC  = 0x00;                     //C口设置为输入
           PORTD = 0x00;                     //LED高电平有效，则初始化时给低电平
           DDRD  = 0xFF;                     
}

main( )
{
    port_init();
    while(1)
    {
        if(((PINC&0x02        )==0) &&!keymark)
        {
            delay_ms(20);//延时10ms 去抖
            if(((PINC&0x02        )==0) )
            {
                keymark=1;//封锁按键,直到按键抬起
                PORTD.7=!PORTD.7;    //LED状态取反，用CVAVR可以，但ICCAVR不行，因为它不支持位操作。
            }
        }
        else if(!((PINC&0x02        )==0) )
        keymark=0;//标志清零,为下次按键做好准备
    }
}