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#include #include
#define ad9852_D P1 #define ad9852A_Ctrl P2
sbit ddsRST =P3^5 ; sbit ddsWR =P3^4 ;
unsigned char Mul_fctrl=4,M_ctrl=0,PLL_BPnum=0x20; //disable PLL unsigned long F0ctrl_word=0; //频率 unsigned char AD9852_F0[6];
/*****************写地址,写数据**************************/ void Write_AD9852(unsigned char ADDR,unsigned char WRdata) { ad9852A_Ctrl =ADDR; ad9852_D=WRdata; ddsWR="0"; ddsWR="1"; }
/**********************工作模式选择***********************/
void WR_AD9852Mode(unsigned char M_ctrl) { Write_AD9852(0x1F,0x01|(M_ctrl<<1)); } /**********************DDS初使化************************/ void ddsInit() { unsigned char i; for(i=15;i>0;i--); ddsRST="0"; for(i=15;i>0;i--); ddsRST="1"; for(i=15;i>0;i--); ddsRST="0"; ddsWR="1";
Write_AD9852(0x1F,0X01); //普通模式,内部更新时钟 Write_AD9852(0x20,0x40); //旁路反正弦 } /*******************DDS开始***********************/ void start_dds(F0ctrl_word) { unsigned char i; for(i=0;i<4;i++) { AD9852_F0[i+2]=(unsigned char)( (long)(F0ctrl_word*85.89934592) >>(8*i) ); //f250m=17.179869184 Write_AD9852((7-i),AD9852_F0[i+2]); //f50m= } } |
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