//////////T法測(cè)頻調(diào)試程序改進(jìn)版/////////////
/////////t3 頻率方波輸出//////////////
/////////t4 脈沖計(jì)數(shù)/////////////////////
/////////t2 計(jì)時(shí)////////////////////////////
/////////t2t3t4_pro.c//////////////////////////
#include <C8051F040.h>
#define T3RUN temppage=SFRPAGE;SFRPAGE=0x01;TR3=1;SFRPAGE=temppage
#define T4RUN temppage=SFRPAGE;SFRPAGE=0x02;TR4=1;SFRPAGE=temppage
#define T4STOP temppage=SFRPAGE;SFRPAGE=0x02;TR4=0;SFRPAGE=temppage
#define T3STOP temppage=SFRPAGE;SFRPAGE=0x01;TR3=0;SFRPAGE=temppage
typedef unsigned int uint;
typedef unsigned char uchar;
typedef unsigned long ulong;
sfr16 RCAP2=0xca;
sfr16 RCAP3=0xca;
sfr16 RCAP4=0xca;
sfr16 TMR4=0xcc;
sfr16 TMR3=0xcc;
sfr16 TMR2=0xcc;
uchar temppage;
uchar tf2num;
bit isnewdata;
ulong freTime;
bit isfilter;
void t4ISR();
void t2ISR();
void delay1ms(uint time){//延遲1ms
	uint i;
	uint j;
	for (i=0;i<time;i++){
		for(j=0;j<300;j++);
	}
}	
void t3_fre_set(uint val){//T3頻率設(shè)置，計(jì)算公式為:(T3時(shí)鐘頻率/(2*val))
	temppage=SFRPAGE;
	SFRPAGE=0x01;
	RCAP3=~val+1;
	TMR3=RCAP3;
	SFRPAGE=temppage;
}
void t3_ini(){//t3為頻率輸出模式
	temppage=SFRPAGE;
	SFRPAGE=0x01;
	TMR3CN=0x00;//TR3=0,T3尚未啟動(dòng)
	TMR3CF=0x0e;//T3采用系統(tǒng)時(shí)鐘，TOG3=1,T3不計(jì)數(shù)時(shí)輸出為1，DCEN=0
	SFRPAGE=temppage;
}
void t4_ini(){//T4為計(jì)數(shù)模式
	temppage=SFRPAGE;
	SFRPAGE=0x02;
	TMR4CF=0X00;//計(jì)數(shù)模式下，對(duì)T4M1-T4M0設(shè)置無(wú)效，DCEN=0,向下計(jì)數(shù)禁止
	TMR4CN=0X02;//CT4=1，T4為計(jì)數(shù)器模式
	SFRPAGE=0X00;
	EIE2|=0X04;//T4中斷使能
	SFRPAGE=temppage;
}
void t2_ini(){//t2為定時(shí)器模式，采用系統(tǒng)時(shí)鐘12分頻
	temppage=SFRPAGE;
	SFRPAGE=0x00;
	TMR2CN=0X00;//定時(shí)器模式，自動(dòng)重載
	TMR2CF=0x00;//DCEN=0,向下計(jì)數(shù)禁止，采用系統(tǒng)時(shí)鐘
	RCAP2=0x0000;
	TMR2=0x0000;
	SFRPAGE=0X00;
	IE|=0X20;//T2中斷使能
	SFRPAGE=temppage;
}
void t2_start(){
	temppage=SFRPAGE;
	SFRPAGE=0x00;
	TMR2=0x0000;
	TF2=0;
	TR2=1;
	SFRPAGE=temppage;
}
void t4_set(uint val){//val為計(jì)數(shù)脈沖數(shù)
	temppage=SFRPAGE;
	SFRPAGE=0x02;
	RCAP4=~val+1;
	TMR4=RCAP4;
	SFRPAGE=temppage;
}
void startCount(uint val){//開(kāi)始計(jì)時(shí)
	t4_set(1);
	T4RUN;
	while(!isfilter);
	t4_set(val);
	T4RUN;
	tf2num=0;
	t2_start();
	isnewdata=0;
}
void config(){
//看門狗禁止
	WDTCN = 0x07;	
    WDTCN = 0xDE;   
   	WDTCN = 0xAD;
	SFRPAGE = 0x0F;
//交叉開(kāi)關(guān)配置，T3＝P0.0,T4=P0.1,測(cè)試時(shí)將T3與T4相連
	XBR0 = 0x00;	
	XBR1 = 0x00;	
	XBR2 = 0x48;
 	XBR3 = 0x01;   
//管腳輸出配置，P0口為開(kāi)漏輸出，其中P0.0接上拉電阻，P0為數(shù)字輸入口
 	SFRPAGE = 0x0F;
 	P0MDOUT = 0x00; 
 	P1MDIN = 0xFF;  
//晶振配置，采用內(nèi)部晶振8分頻
	SFRPAGE = 0x0F;
 	CLKSEL = 0x00;  
	OSCXCN = 0x00;	
	OSCICN = 0x84;	
}
void main(void){
	xdata ulong t3frequency[5];
	uint frenum=100;
	ulong fre_factor;
	uchar k=0;
	config();
	t2_ini();
	t3_ini();
	t4_ini();
	EA=1;
	fre_factor=255208L*(ulong)frenum;
	t3_fre_set(1000);
	T3RUN;
	startCount(frenum);
	isnewdata=0;
	while(1){
		if(isnewdata){
			if(k>=5)
				k=0;//在此設(shè)斷點(diǎn)觀察數(shù)據(jù)
			t3frequency[k++]=fre_factor/freTime;
			delay1ms(100);
			startCount(frenum);
			}
	}
}
void t4ISR() interrupt 16 {//frenum個(gè)頻率計(jì)滿，產(chǎn)生T4中斷
	temppage=SFRPAGE;
	SFRPAGE=0X00;
	TR2=0;//將T2停止，并計(jì)算frenum個(gè)脈沖所需要的時(shí)間，從而可以計(jì)算頻率
	freTime=TMR2;
	SFRPAGE=0X02;
	TR4=0;
	TF4=0;
	isnewdata=1;
	isfilter=1;
	freTime+=65536L*tf2num;//需要加上T2的溢出時(shí)間
	//注意若頻率不是很高，frenum不宜過(guò)大，否則會(huì)使freTime計(jì)算溢出
	//若精度有要求，可采用浮點(diǎn)運(yùn)算
	SFRPAGE=temppage;
}
void t2ISR() interrupt 5{//T2定時(shí)溢出處理
	temppage=SFRPAGE;
	SFRPAGE=0X00;
	TF2=0;
	tf2num++;
	SFRPAGE=temppage;
}