PPM解码程序

PPM解码程序//PPM解码程序//用INT0接PPM信号//T0计数，用来测量脉宽//注意，这个不是标准的PPM信号，刚好和PPM信号相位相反//测得的PPM信号在LCD上显示//PPM信号取自天地飞6A接收机//时间：2012年2月15日0:22:31#include#include#defineDataPortP0sbitRS=P2^4;sbitRW=P2^5;sbitEN=P2^6;unsignedcharchannel=0,i=0;unsignedintxdataPPM_channel1[10],PPM_channel...

//PPM解码程序//用INT0接PPM信号//T0计数，用来测量脉宽//注意，这个不是标准的PPM信号，刚好和PPM信号相位相反//测得的PPM信号在LCD上显示//PPM信号取自天地飞6A接收机//时间：2012年2月15日0:22:31#include#include#defineDataPortP0sbitRS=P2^4;sbitRW=P2^5;sbitEN=P2^6;unsignedcharchannel=0,i=0;unsignedintxdataPPM_channel1[10],PPM_channel2[10],PPM_channel3[10],PPM_channel4[10],PPM_channel5[10],PPM_channel6[10];bitTimer0_OverFlowFlag=0;//定时器0的溢出标志，如果溢出，则有问题；unsignedcharqian,bai,shi,ge;#defineRS_CLRRS=0;#defineRS_SETRS=1;#defineRW_SETRW=1;#defineRW_CLRRW=0;#defineEN_CLREN=0;#defineEN_SETEN=1;//和ＬＣＤ显示有关的函数定义voidLCD_Check_Busy(void);//查忙函数voidLCD_Clear(void);//清屏函数voidLCD_Init(void);//lcd初始化函数voidLCD_Write_Com(unsignedcharcom);//控制字写入函数voidLCD_Write_Data(unsignedcharData);//数据写入函数voidLCD_Write_Char(unsignedcharx,unsignedchary,unsignedcharData);//写入单个字符voidLCD_Write_String(unsignedcharx,unsignedchary,unsignedchar*s);//写入字符串unsignedintfilter(unsignedint*s);//中值平局滤波；voidDepartNum(unsignedinttemp);//用于分解要显示的数据voidDelayUs2x(unsignedchart);voidDelayMs(unsignedintt);voidmain(void){unsignedchar*InitIform;unsignedinttemp;InitIform="Init_is_OK";LCD_Init();DelayMs(10);LCD_Write_String(3,0,InitIform);//初始化Timer0TMOD=0x01;//timer0方式1ET0=1;//允许timer0中断//初始化INT0IT0=1;//负跳变触发中断；EX0=1;EA=1;DelayMs(10000);while(1){temp=filter(PPM_channel1);DepartNum(temp);LCD_Write_Char(0,0,'A');LCD_Write_Char(1,0,qian);LCD_Write_Char(2,0,bai);LCD_Write_Char(3,0,shi);LCD_Write_Char(4,0,ge);temp=filter(PPM_channel2);DepartNum(temp);LCD_Write_Char(5,0,'B');LCD_Write_Char(6,0,qian);LCD_Write_Char(7,0,bai);LCD_Write_Char(8,0,shi);LCD_Write_Char(9,0,ge);temp=filter(PPM_channel3);DepartNum(temp);LCD_Write_Char(10,0,'C');LCD_Write_Char(11,0,qian);LCD_Write_Char(12,0,bai);LCD_Write_Char(13,0,shi);LCD_Write_Char(14,0,ge);temp=filter(PPM_channel4);DepartNum(temp);LCD_Write_Char(0,1,'D');LCD_Write_Char(1,1,qian);LCD_Write_Char(2,1,bai);LCD_Write_Char(3,1,shi);LCD_Write_Char(4,1,ge);temp=filter(PPM_channel5);DepartNum(temp);LCD_Write_Char(5,1,'E');LCD_Write_Char(6,1,qian);LCD_Write_Char(7,1,bai);LCD_Write_Char(8,1,shi);LCD_Write_Char(9,1,ge);temp=filter(PPM_channel6);DepartNum(temp);LCD_Write_Char(10,1,'F');LCD_Write_Char(11,1,qian);LCD_Write_Char(12,1,bai);LCD_Write_Char(13,1,shi);LCD_Write_Char(14,1,ge);//DelayMs(1000);}}voidDelayUs2x(unsignedchart){while(--t);}voidDelayMs(unsignedintt){while(t--){//大致延时1mSDelayUs2x(245);DelayUs2x(245);}}//查忙函数voidLCD_Check_Busy(void){unsignedchari=255;DataPort=0xff;RS_CLR;RW_SET;EN_SET;while(i--&&(DataPort&0x80));EN_CLR;}//控制字写入函数，入口参数是控制字voidLCD_Write_Com(unsignedcharcom){LCD_Check_Busy();RS_CLR;RW_CLR;DataPort=com;EN_SET;_nop_();EN_CLR;}//写入数据，入口参数是要写入的数据voidLCD_Write_Data(unsignedcharData){LCD_Check_Busy();RS_SET;RW_CLR;DataPort=Data;EN_SET;_nop_();EN_CLR;}//清屏函数voidLCD_Clear(void){LCD_Write_Com(0x01);DelayMs(5);}//LCD显示字符串，入口参数是字符显示的位置X（0-15），显示的行数y（0,1），*S显示的字符串voidLCD_Write_String(unsignedcharx,unsignedchary,unsignedchar*s){if(y==0)LCD_Write_Com(0x80+x);elseLCD_Write_Com(0xc0+x);while(*s){LCD_Write_Data(*s);s++;}}//LCD显示字符串，入口参数是字符显示的位置X（0-15），显示的行数y（0,1），Data显示的字符voidLCD_Write_Char(unsignedcharx,unsignedchary,unsignedcharData){if(y==0)LCD_Write_Com(0x80+x);elseLCD_Write_Com(0xc0+x);DelayMs(1);//alittledelayforsimulationLCD_Write_Data(Data);}//lcd初始化函数voidLCD_Init(void){LCD_Write_Com(0x38);//setthedisplaymodelDelayMs(5);LCD_Write_Com(0x08);//turndownthedisplay//LCD_Write_Com(0x01);//clearthedisplayLCD_Clear();LCD_Write_Com(0x06);//setthe光标movingmodelDelayMs(5);LCD_Write_Com(0x0c);//显示开和光标设置}/****************************************用于显示的数位分解函数，把数据转化为ASCII码入口参数是要显示的数据****************************************/voidDepartNum(unsignedinttemp){qian=temp/1000+0x30;bai=temp%1000/100+0x30;shi=temp%100/10+0x30;ge=temp%10+0x30;}voidISIR_INT0(void)interrupt0{unsignedintPPM_temp;if(TR0){TR0=0;//停止计数；PPM_temp=TH0;PPM_temp=(PPM_temp<<8)|TL0;TH0=0;TL0=0;TR0=1;//给TH0和TL0赋初值后重新启动定时器}else{TH0=0;//如果是第一次启动中断，则启动timer0TL0=0;TR0=1;}if(PPM_temp>3000||Timer0_OverFlowFlag)//判断引导区{channel=0;Timer0_OverFlowFlag=0;i++;if(i==10)i=0;}switch(channel){case1:PPM_channel1[i]=PPM_temp;break;case2:PPM_channel2[i]=PPM_temp;break;case3:PPM_channel3[i]=PPM_temp;break;case4:PPM_channel4[i]=PPM_temp;break;case5:PPM_channel5[i]=PPM_temp;break;case6:PPM_channel6[i]=PPM_temp;break;case7:break;case8:break;default:break;}channel++;}voidISIR_Timer0(void)interrupt1{Timer0_OverFlowFlag=1;}unsignedintfilter(unsignedint*s){unsignedchark,j;unsignedintsum=0;unsignedinttemp;for(k=0;k<9;k++)for(j=k+1;j<10;j++)if(s[k]>s[j]){temp=s[k];s[k]=s[j];s[j]=temp;}for(k=1;k<9;k++)sum+=s[k];sum=sum/8;returnsum;}

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PPM解码程序

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