ad9851 qita.c

ad9851的串行输入控制

//====================================================================
//                Copyright (C), 2006, HUST.
//    ----Filename:    AD9851.c
//    -Description:    AD9851驱动

//====================================================================
//头文件
#include "SPCE061A.h"
//变量说明
unsigned long int Freq_Ctrl_Word = 0x051eb851;    //频率控制字    先传低位再传高位
unsigned int Phase_Ctrl_Word = 0x0000; //相位控制字        先传低位再传高位
unsigned int Order_Ctrl_Word = 0x0000;//b32:0 6倍频关闭 b33b34:00 电源工作模式
//定义AD9851与SPCE061A的接口
#define M_DATA    0x0001 
#define M_UD            0x0002
#define M_CLK        0x0004
#define Set_IOA_Bit(x)        (*P_IOA_Data = *P_IOA_Buffer | x)                //置高
#define    Clear_IOA_Bit(x)    (*P_IOA_Data = *P_IOA_Buffer & ~x)            //置低
//====================================================================
// ----Function:    void Init_AD9851(void)
// -Description: 初始化与AD9851连接的IO口                                                
// --Parameters:    无
// ------Return:    无
// -------Notes:    不影响其他IO口
//====================================================================
void Init_AD9851(void)
{
    *P_IOA_Dir |= (M_DATA + M_UD + M_CLK);
    *P_IOA_Attrib |= (M_DATA + M_UD + M_CLK);
    *P_IOA_Data &= ~(M_DATA + M_UD + M_CLK);
}
//====================================================================
// ----Function: void Write_AD9851(void)
// -Description: 向AD9851写入频率控制字,命令控制字和相位控制字                                                
// --Parameters:    无
// ------Return:    无
// -------Notes:    无
//====================================================================
void Write_AD9851(void)
{
    unsigned long int mask = 0x0001;
    unsigned int i;
    Clear_IOA_Bit(M_UD);    //M_UD置低
    //送32位频率控制字
    for(i = 0;i < 32;i++)
    {
        Clear_IOA_Bit(M_CLK); //M_CLK置低
        if(Freq_Ctrl_Word & mask)
        {
            Set_IOA_Bit(M_DATA);
        }
        else 
        {
            Clear_IOA_Bit(M_DATA);
        }
        Set_IOA_Bit(M_CLK);
        mask = mask << 1;
    }
    //送3位的命令控制字
    mask = 0x0001;
    for(i = 0;i < 3;i++)
    {
        Clear_IOA_Bit(M_CLK); //M_CLK置低
        if(Order_Ctrl_Word & mask)
        {
            Set_IOA_Bit(M_DATA);
        }
        else 
        {
            Clear_IOA_Bit(M_DATA);
        }
        Set_IOA_Bit(M_CLK);
        mask = mask << 1;
    }
    //送5位相位控制字
    mask = 0x0001;
    for(i = 0;i < 5;i++)
    {
        Clear_IOA_Bit(M_CLK); //M_CLK置低
        if(Phase_Ctrl_Word & mask)
        {
            Set_IOA_Bit(M_DATA);
        }
        else 
        {
            Clear_IOA_Bit(M_DATA);
        }
        Set_IOA_Bit(M_CLK);
        mask = mask << 1;
    }
    Set_IOA_Bit(M_UD);    //M_UD置高 ,产生上升沿 ,频率更新使能,输出有效
}
main()
{
unsigned long int i;	
Init_AD9851();
//while(1)
//{

for(i=0;i<=100000;i++);
Write_AD9851();	
//}	
	
	
}