PIC16F877輸出正弦波信號PROTEUS仿真及程序

ID:138119 · 發表于 2019-1-23 00:11

//PIC16F877單片機輸出正弦波信號仿真原理圖如下（proteus仿真工程文件可到本帖附件中下載）

//20MHz晶振，輸出500Hz的正弦波，每周波100個點。
//1個周期時間為2ms,二點間隔時間為2000/100=20us
//用TMR2延時,256*Tcy*K=20,Tcy=0.2,取K=1
//PR2計算：(PR2+1)*Tcy*1=20,得PR2=99

#include <pic.h>
__CONFIG(0x3F3A);
#define       CS             RB1
#define       LDAC       RB2

char BUF,N;
#define  nn 100
const unsigned int SS[100]={
2048,2111,2173,2235,2297,2357,2416,2474,2530,2584,2636,2685,2733,2777,2819,2857,
2892,2924,2953,2978,2999,3017,3030,3040,3046,3048,3046,3040,3030,3017,2999,2978,
2953,2924,2892,2857,2819,2777,2733,2685,2636,2584,2530,2474,2416,2357,2297,2235,
2173,2111,2048,1985,1923,1861,1799,1739,1680,1622,1566,1512,1460,1411,1363,1319,
1277,1239,1204,1172,1143,1118,1097,1079,1066,1056,1050,1048,1050,1056,1066,1079,
1097,1118,1143,1172,1204,1239,1277,1319,1363,1411,1460,1512,1566,1622,1680,1739,
1799,1861,1923,1985};

//宏定義，最后的讀SSPBUF是一定要的!
#define SPI_WRITE(A)       \
      SSPBUF=A;                      \
      while(STAT_BF==0);       \
      BUF=SSPBUF

void       main(void)
{       unsigned int x;

      TRISB=0b11111001;
      CS=1;NOP();
      LDAC=1;
      TRISC=0b00010000;       //RC3輸出(SCK),RC4輸入(SDI),RC5輸出(SDO)
      SSPEN=1;                      //SPI串口使能
      CKP=1;                               //空閑時鐘為高電平
      SSPM3=0;
      SSPM2=0;
      SSPM1=0;
      SSPM0=0;                      //SPI主控模式,時鐘為Fosc/4
      STAT_SMP=1;                      //在數據輸出時間的末端采樣輸入數據
      STAT_CKE=0;                      //在SCK上升沿傳輸數據
      PR2=99;                               //按照計算，每20us中斷一次
      T2CON=0b00000100;
      N=0;
      TMR2IE=1;                      //允許TMR2中斷
      PEIE=1;
      GIE=1;
      while(1);
}

void       interrupt INT_ISR(void)
{       unsigned       int X;
      char       i,j;
      if (TMR2IF==1)
      {       TMR2IF=0;
            X=SS[N++];
            if (N>=nn)
                     N=0;
            X+=0x7000;                      //HSDN=1，參考電壓緩沖，放大倍數GA=1
            CS=0;                               //片選有效
            i=X>>8;
            j=X;
            SPI_WRITE(i);             //輸出命令的高8位
            SPI_WRITE(j);             //輸出命令的低8位
            LDAC=0;NOP();             //DA輸出有效
            LDAC=1;NOP();
            CS=1;
      }
}

全部資料51hei下載地址：

PIC16F877輸出正弦波信號仿真及程序.rar (44.66 KB, 下載次數: 51)

DA應用+正弦波產生.pdf (2.1 MB, 下載次數: 30)