/////////t3 頻率方波輸出//////////////
/////////PCA CEX4 捕捉 測(cè)試程序//////
/////////PCA_CAP.c//////////////////////////
#include <C8051F040.h>
#define T3RUN temppage=SFRPAGE;SFRPAGE=0x01;TR3=1;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;
sfr16 PCA0CP0=0xfb;
sfr16 PCA0CP1=0xfd;
sfr16 PCA0CP2=0xe9;
sfr16 PCA0CP3=0xeb;
sfr16 PCA0CP4=0xed;
sfr16 PCA0CP5=0xe1;
uchar temppage;
xdata uint pcacap4[10];
uchar num1=0;
bit isnewdata;
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 pca4ini(){//PCA CEX4配置為正負(fù)邊沿均捕捉
	SFRPAGE=0x00;
	PCA0CPM4 = 0x31;    // 正負(fù)邊沿觸發(fā)模式，CEX4捕捉中斷使能
 	PCA0CPL4 = 0x00;    
 	PCA0CPH4 = 0x00;    
}
void pcaini(){
	SFRPAGE=0x00;
	PCA0MD=0x08;//PCA采用系統(tǒng)時(shí)鐘，且PCA溢出中斷禁止
	PCA0CN=0x40;//啟動(dòng)PCA計(jì)數(shù)器
	EIE1|=0x08;//PCA中斷使能
}
void config(){
//看門(mén)狗禁止
	WDTCN = 0x07;	
    WDTCN = 0xDE;   
   	WDTCN = 0xAD;
	SFRPAGE = 0x0F;
//交叉開(kāi)關(guān)配置，CEX4配置在P0.4,T3輸出配置在P0.6
	XBR0 = 0x30;	
	XBR1 = 0x00;	
	XBR2 = 0x40;
 	XBR3 = 0x01;   
//管腳輸出配置，P0口為開(kāi)漏輸出，其中P0.6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){//測(cè)試時(shí)將P0.6與P0.4口相連
	xdata uint freset=1000;
	config();
	t3_ini();
	t3_fre_set(freset);
	T3RUN;
	EA=1;
	num1=0;
	isnewdata=0;
	pcaini();
	pca4ini();
	while(1){
		if(isnewdata){
			isnewdata=0;
			if(num1>=10)
				num1=0;
		}
	}
}
void PCA_ISR(void) interrupt 9 using 1 {
	static xdata uint tmpcnt=0;
	if(CCF4){
		pcacap4[num1]=PCA0CP4-tmpcnt;
		tmpcnt=PCA0CP4;
		num1++;
		CCF4=0;
	}
	isnewdata=1;
  }