//////////////用PCA檢測UART0特波率調試程序/////////////////
/////////////pca_UART0.c//////////////////////
#include <C8051F040.h>	// Register definition file.
typedef unsigned char uchar;
typedef unsigned int uint;
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;
xdata uchar k;
xdata uchar t;
enum {aalen=3};
sbit p00=P0^0;
uchar testdata;//發送測試數據
void delay1ms(uint time);
void uart0_ini();
void t1_ini();
void t1_baud(uchar val);
void t2_ini();
void t2_baud(uint t2reload);
void config (void) ;
xdata ulong pcacap0[40];
void uart0_ini(){
    SFRPAGE = 0x00;
    SADEN0 = 0x00;      
	// SADEN0為UART0從機地址控制寄存器，0表示相應位地址不參加過濾，即該位地址值為0或1均為有效地址
    SADDR0 = 0x00;    
	// SADDR0為UART0從機地址設置寄存器
    SSTA0 = 0x01;      
	// SMOD0＝0，UART0波特率2分頻禁止
	//TX時鐘源為T2，RX時鐘源為T1
    SCON0 = 0x50; 
	//工作在模式1
    SCON0 &= 0xFC; 	//將TI0和RI0清零
    IE|=0x10;
    t1_ini();
	t2_ini();
 }
void t1_ini(){
    SFRPAGE = 0x00;
    CKCON = 0x10;   // T1采用系統時鐘，不分頻
    TMOD = 0x20;    // T1為8bit自動重載模式
    TCON = 0x40;    // TR1置1，啟動定時器
}
void t1_baud(uchar val){//T1溢出率設置，溢出率為（T1時鐘頻率）/(val)
	SFRPAGE = 0x00;
	TH1 = ~val+1;     
	TL1 = TH1;     
}
void t2_ini(){
	SFRPAGE = 0x00;
	TMR2CF = 0x08; 
	//T2為系統時鐘不分頻，計數方向為增值計數
    TMR2CN = 0x04;  // TR2置1，啟動定時器
}
void t2_baud(uint t2reload){//T2溢出率設置，溢出率為(T2時鐘頻率）/(t2reload)
	SFRPAGE = 0x00;
	RCAP2=~t2reload+1;
	TMR2=RCAP2;
}
void pca0ini(){//PCA CEX4配置為正負邊沿均捕捉
	SFRPAGE=0x00;
	PCA0CPM0 = 0x31;    
 	PCA0CPL0 = 0x00;    
 	PCA0CPH0 = 0x00;    
}
void pcaini(){
	SFRPAGE=0x00;
	PCA0MD=0x09;
	PCA0CN=0x40;
	EIE1|=0x08;
}
void config(){
//看門狗禁止
	WDTCN = 0x07;	
    WDTCN = 0xDE;   
   	WDTCN = 0xAD;
	SFRPAGE = 0x0F;
//交叉開關配置，TX0=P0.0;RX0=P0.1,CEX0=P0.2,將TX0與CEX0相連
	XBR0 = 0x34;	
	XBR1 = 0x00;	
	XBR2 = 0x40;
 	XBR3 = 0x00;   
//管腳輸出配置，P0口為開漏輸出，其中P0.6接上拉電阻，P0為數字輸入口
 	SFRPAGE = 0x0F;
 	P0MDOUT = 0x00; 
 	P1MDIN = 0xFF;  
//晶振配置，采用內部晶振8分頻
	SFRPAGE = 0x0F;
 	CLKSEL = 0x00;  
	OSCXCN = 0x00;	
	OSCICN = 0x84;	
}
void main(){
	config();
	uart0_ini();
	t1_baud(0x24);
	t2_baud(100);
	pcaini();
	pca0ini();
	EA=1;
	k=0;
	t=0;
	testdata=0xaa;
	SFRPAGE=0x00;
	SBUF0=testdata;//啟動發送
	while(1){
		if(k>=aalen){
			SFRPAGE=0x00;
			//TR2=0;//停止定T2時器，從而停止發送
		}
		if(t>=aalen){
			SFRPAGE=0x00;
			//TR1=0;//停止定T1時器，從而停止接收
		}
	}
}
void uart0_ISR() interrupt 4{//全雙工發送接收
	uchar temp;
	SFRPAGE=0x00;
	if(SCON0&0x01){
		t++;
		temp=SBUF0;
		SCON0&=0xfe;
	}
	if(SCON0&0x02){
		k++;
		SBUF0=testdata;//從aa數組中取數據發送
		SCON0&=0xfd;
	}
}
void PCA_ISR(void) interrupt 9  {
	static xdata  uchar num1=0;
	static xdata uint tmpcnt=0;
	SFRPAGE = 0x00;
	if(CF){
		CF=0;
	}
	if(CCF0){
		pcacap0[num1]=PCA0CP0-tmpcnt;
		tmpcnt=PCA0CP0;
		if(!p00)
			pcacap0[num1]+=10000000L;//若P0.0上一檢測周期為邏輯1，數據加上10000000L與邏輯0相區別
		num1++;
		if(num1>=100){
			num1=0;
		}	
		CCF0=0;
	}
  }