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/--------------------------------------------------------------------------------AD9851.h-------------------------------------------------------------------------------/#include "DSP28_Device.h"//AD9851的I/O控制口宏定义#define DDS_W_CLK GpioDataRegs.GPADAT.bit.GPIOA12#define DDS_FQ_UD GpioDataRegs.GPADAT.bit.GPIOA13#define DDS_RESET GpioDataRegs.GPADAT.bit.GPIOA14#define DDS_D7 GpioDataRegs.GPADAT.bit.GPIOA15//AD9851相关函数申明void AD9851_Init(void);void Write_AD9851(Uint32 dds);void AD9851_Change(Uint32 freq);/--------------------------------------------------------------------------------AD9851.c-------------------------------------------------------------------------------/#include "DSP28_Device.h"//AD9851初始化void AD9851_Init(void){unsigned int i;unsigned int Serial_Mode = 0x03;EALLOW;//作为一般I/O口GpioMuxRegs.GPAMUX.bit.TCLKINA_GPIOA12=0;GpioMuxRegs.GPAMUX.bit.C1TRIP_GPIOA13 =0;GpioMuxRegs.GPAMUX.bit.C2TRIP_GPIOA14 =0;GpioMuxRegs.GPAMUX.bit.C3TRIP_GPIOA15 =0;//选择I/O口作为输出GpioMuxRegs.GPADIR.bit.GPIOA12=1;GpioMuxRegs.GPADIR.bit.GPIOA13=1;GpioMuxRegs.GPADIR.bit.GPIOA14=1;GpioMuxRegs.GPADIR.bit.GPIOA15=1;EDIS;DDS_W_CLK=0;DDS_FQ_UD=0;DDS_RESET=0;DDS_RESET=1;DelayUs(10000);DDS_RESET=0;DelayUs(10000);//配置串行方式 for (i = 0;i < 8;i++) { DDS_W_CLK=0; if (Serial_Mode & 0x01) { DDS_D7=1; } else { DDS_D7=0; } DDS_W_CLK=1; Serial_Mode = Serial_Mode >> 1; DelayUs(1000); } DDS_FQ_UD=1; DelayUs(2000); DDS_FQ_UD=0; DDS_W_CLK=0;}//频率void AD9851_Change(Uint32 freq){Uint32 dds;dds = freq * 23.860929422 ; Write_AD9851(dds);}//写数据void Write_AD9851(Uint32 dds){ unsigned int i; DDS_W_CLK=0; DDS_FQ_UD=0; for (i = 0;i < 40;i++) { DDS_W_CLK=0; DelayUs(2000); if((dds&0x00000001)||(i==32)) //取数据，6倍频使能 { DDS_D7=1; } else { DDS_D7=0; } DDS_W_CLK=1; DelayUs(2000); dds = dds >> 1; }DDS_FQ_UD=1;DDS_W_CLK=0;DelayUs(2000);DDS_FQ_UD=0;} |
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