第十五届蓝桥杯单片机省赛真题解析

#include "init.h" #include "led.h" #include "seg.h" #include "key.h" #include "iic.h" #include "ds1302.h" #include "stdio.h" #include "tim.h" //seg unsigned char pucSeg_Buf[12],pucSeg_Code[8],ucSeg_Pos=0; //freq long Freq=0;//int -32768 32767 long Freq_Max=0; //RTC unsigned char pucRTC[3]={23,59,55}; unsigned char pucRTC_Freq[3]={23,59,55}; //param long Cal_Param=0; unsigned int Limit_Param=2000; //key unsigned char Key_Val=0,Key_Val_Old=0; //timer unsigned long ulms=0; unsigned int uiSeg_Dly=0; unsigned int uiKey_Dly=0; unsigned int uiRTC_Dly=0; unsigned int uiDAC_Dly = 0; unsigned int uiLed_Dly = 0; //Led unsigned char ucLed = 0x00; unsigned char L1_Flag = 0; unsigned char L2_Flag = 0; //function void Seg_Proc(void); void Key_Proc(void); void RTC_Proc(void); void DAC_Proc(void); void Led_Proc(void); //mode unsigned char Disp_Mode=0; unsigned char Para_Mode=0; unsigned char Record_Mode=0; void main(void) { Cls_Peripheral(); Timer0Init(); Timer1Init(); Set_RTC(pucRTC); EA=1; while(1) { Seg_Proc(); Key_Proc(); RTC_Proc(); DAC_Proc(); Led_Proc(); } } void Seg_Proc(void) { if(uiSeg_Dly<100) return; uiSeg_Dly=0; if(Disp_Mode==0) { if(Freq>=0) sprintf(pucSeg_Buf,"F %5ld",Freq); else sprintf(pucSeg_Buf,"F LL"); } else if(Disp_Mode==1) { if(Para_Mode==0) { sprintf(pucSeg_Buf,"P1 %4u",Limit_Param); } else { sprintf(pucSeg_Buf,"P2 %4ld",Cal_Param); } } else if(Disp_Mode==2) { sprintf(pucSeg_Buf,"%02u-%02u-%02u",(unsigned int)pucRTC[0],(unsigned int)pucRTC[1],(unsigned int)pucRTC[2]); } else { if(Record_Mode==0) { sprintf(pucSeg_Buf,"HF %5ld",Freq_Max); } else { sprintf(pucSeg_Buf, "HA%02u%02u%02u", (unsigned int)pucRTC_Freq[0], (unsigned int)pucRTC_Freq[1], (unsigned int)pucRTC_Freq[2]); } } Seg_Tran(pucSeg_Buf,pucSeg_Code); } void RTC_Proc(void) { if(uiRTC_Dly<200) return; uiRTC_Dly=0; Get_RTC(pucRTC); } void DAC_Proc(void) { float k, b; unsigned char ucDAC; if(uiDAC_Dly < 200) return; uiDAC_Dly = 0; if(Freq < 0) PCF8591_DAC(0); else if(Freq < 500) PCF8591_DAC(51); else if(Freq > Limit_Param) PCF8591_DAC(255); else { k = 204.0/(Limit_Param - 500.0); b = 51 - 500.0*k; ucDAC = k*Freq + b; PCF8591_DAC(ucDAC); } } void Key_Proc(void) { if(uiKey_Dly<20) return; uiKey_Dly=0; Key_Val=Key_Read_KBD(); if(Key_Val==Key_Val_Old) return; switch(Key_Val) { case 4: Disp_Mode=(Disp_Mode+1)%4; if(Disp_Mode==1) { Para_Mode=0; } else if(Disp_Mode == 3) { Record_Mode = 0; } break; case 5: if(Disp_Mode==1) { Para_Mode=(Para_Mode+1)%2; } else if(Disp_Mode == 3) { Record_Mode = (Record_Mode + 1) % 2; } break; case 9: if(Disp_Mode==1) { if(Para_Mode==0) { if(Limit_Param>1000) { Limit_Param-=1000; } } else { if(Cal_Param>-900) { Cal_Param-=100; } } } break; case 8: if(Disp_Mode==1) { if(Para_Mode==0) { if(Limit_Param<9000) { Limit_Param+=1000; } } else { if(Cal_Param<900) { Cal_Param+=100; } } } break; } Key_Val_Old=Key_Val; } void Led_Proc(void) { if(uiLed_Dly < 100) return; uiLed_Dly = 0; if(Disp_Mode == 0) { L1_Flag = (L1_Flag + 1) % 2; if(L1_Flag == 0) ucLed ^= 0x01; } else { ucLed &= ~0x01; } if(Freq < 0) { ucLed |= 0x02; } else if(Freq > Limit_Param) { L2_Flag = (L2_Flag + 1) % 2; if(L2_Flag == 0) ucLed ^= 0x02; } else { ucLed &= ~0x02; } Led_Disp(ucLed); } void Timer1(void) interrupt 3 { ulms++; uiSeg_Dly++; uiKey_Dly++; uiRTC_Dly++; uiDAC_Dly++; uiLed_Dly++; if(ulms%2==0) { ucSeg_Pos=(ucSeg_Pos+1)%8; Seg_Disp(pucSeg_Code,ucSeg_Pos); } if(ulms%1000==0) { Freq=(unsigned int)(TH0<<8)|TL0; Freq+=Cal_Param; if(Freq>Freq_Max) { Freq_Max=Freq; pucRTC_Freq[0]=pucRTC[0]; pucRTC_Freq[1]=pucRTC[1]; pucRTC_Freq[2]=pucRTC[2]; } TH0=0; TL0=0; } }