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最近用STC89C52做一個(gè)頻率計(jì)數(shù)器，用LCD1602顯示，外接1kHz的方波到T0進(jìn)行測(cè)試的時(shí)候，發(fā)現(xiàn)T0沒(méi)有對(duì)方波進(jìn)行計(jì)數(shù)，下面是代碼，請(qǐng)高手幫忙看看是哪里出了問(wèn)題
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- #include <AT89x52.h>
- #include <stdio.h>
- #include <math.h>
- #include <intrins.h>
- float p;
- char idata buff[20];
- unsigned char time;
- unsigned char T1inter;
- unsigned char GATE = 1; //測(cè)量中斷，0表示開(kāi)始測(cè)量
- unsigned char FLAG = 0; //是否分頻選擇,0不分頻，1分頻
- unsigned char LCD_Wait(void);
- void LCD_Write(bit style, unsigned char input);
- void LCD_SetDisplay(unsigned char DisplayMode);
- void LCD_SetInput(unsigned char InputMode);
- void LCD_Initial();
- void GotoXY(unsigned char x, unsigned char y);
- void Print(unsigned char *str);
- /****************************************
- * 模塊名稱：LCD1602顯示程序 *
- *****************************************/
- /***********************Port Definitions*********************/
- sbit LcdRs = P1^0; //定義端口
- sbit LcdRw = P1^1;
- sbit LcdEn = P2^5;
- sfr DBPort= 0x80; //P0=0x80,P1=0x90,P2=0xA0,P3=0xB0.數(shù)據(jù)端口
- /************************內(nèi)部等待函數(shù)************************/
- unsigned char LCD_Wait(void)
- {
- LcdRs=0; //寄存器選擇輸入端 1:數(shù)據(jù) 0：指令
- LcdRw=1; _nop_(); //RW：為0：寫(xiě)狀態(tài);為1：讀狀態(tài);
- LcdEn=1; _nop_(); //使能輸入端,讀狀態(tài),高電平有效;寫(xiě)狀態(tài),下降沿有效
- LcdEn=0;
- return DBPort;
- }
- /***********************向LCD寫(xiě)入命令或數(shù)據(jù)*******************/
- #define LCD_COMMAND 0 // Command
- #define LCD_DATA 1 // Data
- #define LCD_CLEAR_SCREEN 0x01 // 清屏
- #define LCD_HOMING 0x02 // 光標(biāo)返回原點(diǎn)
- void LCD_Write(bit style, unsigned char input)
- {
- LcdEn=0;
- LcdRs=style;
- LcdRw=0; _nop_();
- DBPort=input; _nop_();//注意順序
- LcdEn=1; _nop_();//注意順序
- LcdEn=0; _nop_();
- LCD_Wait();
- }
- /********************設(shè)置顯示模式****************************/
- #define LCD_SHOW 0x04 //顯示開(kāi)
- #define LCD_HIDE 0x00 //顯示關(guān)
- #define LCD_CURSOR 0x02 //顯示光標(biāo)
- #define LCD_NO_CURSOR 0x00 //無(wú)光標(biāo)
- #define LCD_FLASH 0x01 //光標(biāo)閃動(dòng)
- #define LCD_NO_FLASH 0x00 //光標(biāo)不閃動(dòng)
- void LCD_SetDisplay(unsigned char DisplayMode)
- {
- LCD_Write(LCD_COMMAND, 0x08|DisplayMode);
- }
- /*********************設(shè)置輸入模式****************************/
- #define LCD_AC_UP 0x02
- #define LCD_AC_DOWN 0x00 // default
- #define LCD_MOVE 0x01 // 畫(huà)面可平移
- #define LCD_NO_MOVE 0x00 //default
- void LCD_SetInput(unsigned char InputMode)
- {
- LCD_Write(LCD_COMMAND, 0x04|InputMode);
- }
- /******************初始化LCD*********************************/
- void LCD_Initial()
- {
- LcdEn=0;
- LCD_Write(LCD_COMMAND,0x38); //8位數(shù)據(jù)端口,2行顯示,5*7點(diǎn)陣
- LCD_Write(LCD_COMMAND,0x38);
- LCD_SetDisplay(LCD_SHOW|LCD_NO_CURSOR); //開(kāi)啟顯示, 無(wú)光標(biāo)
- LCD_Write(LCD_COMMAND,LCD_CLEAR_SCREEN); //清屏
- LCD_SetInput(LCD_AC_UP|LCD_NO_MOVE); //AC遞增, 畫(huà)面不動(dòng)
- }
- /*************************************************************/
- void GotoXY(unsigned char x, unsigned char y)
- {
- if(y==0)
- LCD_Write(LCD_COMMAND,0x80|x);
- if(y==1)
- LCD_Write(LCD_COMMAND,0x80|(x-0x40));
- }
- void Print(unsigned char *str)
- {
- while(*str!='\0')
- {
- LCD_Write(LCD_DATA,*str);
- str++;
- }
- }
- /**************************ms延時(shí)子程序********************/
- void Delay(unsigned int t) //t隨著數(shù)值越大,誤差趨于平衡.
- {
- unsigned char i;
- while(t--)
- {
- for(i=0;i<123;i++){;}
- }
- }
- //配置計(jì)數(shù)器0，定時(shí)器1、2
- void Init_timer(void)
- {
- TMOD=0x9D; //工作方式1 內(nèi)部寄存器控制的計(jì)數(shù)功能
- TH0=0x00; //T0高八位的初值
- TL0=0x00; //T0低八位初值
- TH1=0x00; //T1高八位的初值
- TL1=0x00; //T1低八位初值
- EA=1; //開(kāi)啟整體中斷允許
- ET0=1; //開(kāi)啟定時(shí)器0中斷允許
- ET1=1; //開(kāi)啟T1中斷允許
- TR0=1;
- TR1=1;
- EX0=1;
- IT0=1;
- RCAP2H=(65536-62500)/256; //在程序初始化的時(shí)候給RCAP2L和RCAP2H賦值，
- RCAP2L=(65536-62500)%256; //TH2和TL2將會(huì)在中斷產(chǎn)生時(shí)自動(dòng)使TH2=RCAP2H,TL2=RCAP2L。
- TH2=RCAP2H; //12M晶振下每次中斷62.5ms(1s=1000ms=62.5ms×16)
- TL2=RCAP2L;
- ET2=1; //打開(kāi)定時(shí)器2中斷
- TR2=1; //定時(shí)器2開(kāi)始計(jì)時(shí)
- }
- /***************主程序**************/
- void main()
- {
- P1_2=0;
- Init_timer();
- LCD_Initial(); //LCD初始化
- while(1)
- {;}
- }
- //P1.2接INT0，觸發(fā)中斷
- void Out_interrupt(void)interrupt 0
- {
- float t0cont,t1cont;
- //關(guān)閉T0、T1
- TR0=0;
- TR1=0;
- t0cont=TH0*256+TL0;
- t1cont=65535*T1inter+TH1*256+TL1;
- //p=(t0cont/t1cont)*1000000;
- p=t0cont;
- GotoXY(0,1);
- sprintf(buff,"%4.4fKHz",p);
- Print(buff);
- //打開(kāi)T0、T1，重置初值，為下一次測(cè)量做準(zhǔn)備
- TR0=1;
- TR1=1;
- TH0=0x00; //T0高八位的初值
- TL0=0x00; //T0低八位初值
- TH1=0x00; //T1高八位的初值
- TL1=0x00;
- //中斷后開(kāi)始讀數(shù)顯示
- }
- void Timer0_isr(void)interrupt 1
- {
- TH0=0x00;
- TL0=0x00;
- }
- void Timer1_isr(void)interrupt 3
- { T1inter++;
- TH1=0; //計(jì)數(shù)=(65535-初值) 初值0x159F=5535
- TL1=0;
- if(T1inter==4)
- {
- T1inter=0;
- }
- }
- void timer2(void) interrupt 5 //定時(shí)器2中斷(62.5ms)
- {
- time++;
- TF2=0; //定時(shí)器2的中斷標(biāo)志位TF2不能夠由硬件清零，所以要在中斷服務(wù)程序中將其清零
- if (time==4) //定時(shí)0.25s時(shí)間到
- {
- time=0; //計(jì)時(shí)清0
- P1_2=~P1_2;//P1.2反轉(zhuǎn)
- }
- }
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