DDS

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// File Name : AD9850.c
// Author : Qin_Pin_Ele
// Version : V0.01
// Date : 2012-1-21
// Description : AD9850的驱动函数
// Changes : None
//--------------------------------------------------------------------------
#include "ad9850.h"

double Con_Word_1_9850 = 0x00;
double Con_Word_2_9850 = 0x00;
unsigned long int ConTrol_Word_9850 = 0x00;

sbit fqud_9850 = P1^0;
sbit reset_9850 = P1^1;
sbit w_clk_9850 = P1^2;
#define dataport_9850 P0

void Send_Control_Word_9850(unsigned long int ConTrol_Word)
{
unsigned long int ConTrol_Word_Temporary ;
unsigned char data_word ;

w_clk_9850 = 0x00;
fqud_9850 = 0x00;

data_word = 0x00;
dataport_9850 = data_word; //W0
w_clk_9850=1;
w_clk_9850=0;

ConTrol_Word_Temporary = ConTrol_Word;
ConTrol_Word = ConTrol_Word >> 24; //W1
data_word = ConTrol_Word % 256;
dataport_9850 = data_word;
w_clk_9850=1;
w_clk_9850=0;

ConTrol_Word = ConTrol_Word_Temporary;
ConTrol_Word = ConTrol_Word >> 16;
data_word = ConTrol_Word % 256; //W2
dataport_9850 = data_word;
w_clk_9850=1;
w_clk_9850=0;

ConTrol_Word = ConTrol_Word_Temporary;
ConTrol_Word = ConTrol_Word >> 8; //W3
data_word = ConTrol_Word % 256;
dataport_9850 = data_word;
w_clk_9850=1;
w_clk_9850=0;

ConTrol_Word = ConTrol_Word_Temporary;
data_word = ConTrol_Word % 256; //W4
dataport_9850 = data_word;
w_clk_9850=1;
w_clk_9850=0;

fqud_9850=1;

}

void Calculate_Control_Word_9850(unsigned long int Frequency_Out_9850)
{
Con_Word_1_9850 = Frequency_Out_9850 * 34; //算出整数部分
Con_Word_2_9850 = Frequency_Out_9850 * 0.3597; //算出小数部分 (系数=2^32/CLK )
Con_Word_2_9850 = Con_Word_2_9850 + 0.5; //小数部分修正
Con_Word_1_9850 = Con_Word_1_9850 + Con_Word_2_9850; //整数+修正后的小数
ConTrol_Word_9850 = Con_Word_1_9850 / 1; //换成整型
}

void init_9850(void)
{ reset_9850 = 1;
delay_9850(10000);
reset_9850 = 0;
}
void Write_9850(unsigned long int Frequency_Out_9850)
{
init_9850();
Calculate_Control_Word_9850(Frequency_Out_9850);
Send_Control_Word_9850(ConTrol_Word_9850);
}

void delay_9850(long int n)
{
while(n!=0)
{
n--;
}
}