wave.c

DDS产生程序

#include "DF1404.h"

static void SPI_MasterTransmit(U8 cData)
{

     SPDR = cData; 

      while (!(SPSR & (1 << SPIF))); 
}

 void SignalInit(void)
{

        ClrL9834();
        NOP();
        
        SPI_MasterTransmit (0x00);
        NOP();
        SetL9834();
 
        ClrL9834();
        NOP();
       
        SPI_MasterTransmit (0x00);
        NOP();
        SetL9834();

        ClrL9834();
        NOP();
        
        SPI_MasterTransmit (0x00);
        NOP();
        SetL9834();
        Delay_nus(0xff);

        ClrL9834();
        NOP();
        
        SPI_MasterTransmit (0x00);
        NOP();
        SetL9834();
        Delay_nus(0xff);

//Write Control Register
        ClrL9834();
        NOP();
        
        SPI_MasterTransmit (0x00);
        NOP();
        SetL9834();

}

void Sinusoidal(void)
{
  
       ClrL9834();
       NOP();
       SPI_MasterTransmit (0x20);
       SPI_MasterTransmit (0x00);
       NOP();
       SetL9834();

}

void Triangle(void)
{

      ClrL9834 ();
      NOP();
      SPI_MasterTransmit (0x20);  //OPBITEN = 0 , MODEBIT = 1
      SPI_MasterTransmit (0x02);
      NOP();
      SetL9834();

}

void WriteFreq(F32 Freq)
{
      U32 k;
      F32 Temp;
      U8  cData;
      Temp =  Freq;
      k = (U32)Temp;
      
      cData = ( ( (U8*)&k )[1] & 0x4F );
      ClrL9834();
      SPI_MasterTransmit (cData);
      cData = ((U8*)&k)[0];
      SPI_MasterTransmit (cData);
      SetL9834();
      
      k = k << 3;
      cData = (((U8*)&k)[3] & 0x4F);

      ClrL9834();
      SPI_MasterTransmit (cData);
      cData = ( (U8*)&k )[3];
      SPI_MasterTransmit (cData);
      SetL9834();

}

void ChangeWave(void)
{
        if (CurrentState.Wave == SINWAVE)
           {
                 Sinusoidal();
                 Relay &= ~( 1 << RELAYWAVE);
                 UpDataRelay();
                 DispMark[0] &= ~(1 << SquaLed);
                 DispMark[1] &= ~(1 << TriaLed);
                 DispMark[2] |= ( 1 << SinLed);
                 UpDataCH451();
           }
        else if (CurrentState.Wave == SQUAWAVE)
           {
                 Sinusoidal();
                 Relay |= ( 1 << RELAYWAVE );
                 UpDataRelay();
                 DispMark[2] &= ~(1 << SinLed);
                 DispMark[1] &= ~(1 << TriaLed);
                 DispMark[0] |= ( 1 << SquaLed);
                 UpDataCH451();
           }
        else
           {
                 Triangle();
                 Relay &= ~( 1 << RELAYWAVE );
                 UpDataRelay();
                 DispMark[2] &= ~(1 << SinLed);
                 DispMark[1] |= (1 << TriaLed);
                 DispMark[0] &= ~(1 << SquaLed);
                 UpDataCH451();
           }
}