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发表于 2011-6-3 23:10:48
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//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include <C8051F120.h> // SFR declarations
#define tByte unsigned char
#define tWord unsigned int
#define tLong unsigned long
sbit FSYNC=P0^2;
sbit SCLK =P0^1;
sbit SDATA=P0^0;
sbit ddd=P1^6;
tWord Config_Data[8];
void Wave_Generate(tLong,tByte);
//-----------------------------------------------------------------------------
void Oscillator_Init (void) //20MHz晶振内部倍频到100MHz
{
int i = 0;
SFRPAGE = CONFIG_PAGE;
OSCXCN = 0x67;
for (i = 0; i < 3000; i++); // Wait 1ms for initialization
while ((OSCXCN & 0x80) == 0);
PLL0FLT = 0x3F;
CLKSEL = 0x31;
OSCICN = 0x01;
}
//--------------------------------------------------------------------------
void Port_Init (void)
{
SFRPAGE = CONFIG_PAGE;
P0MDOUT = 0xFF;
P1MDOUT = 0xFF;
XBR2 = 0x40;
}
void AD9833_Send_Word(tWord Data_In)
{
tByte i;
SCLK=1;
FSYNC=0;
for(i=0;i<16;i++)
{
SCLK=1;
SDATA=(bit)((Data_In & 0x8000)>>15);
SCLK=0;
Data_In=Data_In<<1;
}
FSYNC=1;
SCLK=0;
}
//波形发生函数
//入口参数: 频率:Freq (<=12000000)
// 形状:0(正弦波),1(三角波),2(方波)
//默认: Fmclk=25MHz, 0相移,方波不分频.
void Wave_Generate(tLong Freq,tByte Shape)
{
tLong temp;
tByte k;
//if(Freq>23000000) Freq=23000000;
switch(Shape)
{
case 0: Config_Data[0]=0x2108;
Config_Data[7]=0x2008;
break;
case 1: Config_Data[0]=0x210A;
Config_Data[7]=0x200A;
break;
case 2: Config_Data[0]=0x2128;
Config_Data[7]=0x2028;
break;
default:Config_Data[0]=0x2108;
Config_Data[7]=0x2008;
}
//temp=Freq*10.73; //temp=Freq*(0x10000000/20000000);
temp=Freq*2.68435456;
Config_Data[1]=temp&0x00003fff;
Config_Data[3]=Config_Data[1];
Config_Data[2]=(temp&0x0fffc000)>>14;
Config_Data[4]=Config_Data[2];
Config_Data[1]=Config_Data[1]|0x4000;
Config_Data[2]=Config_Data[2]|0x4000;
Config_Data[3]=Config_Data[3]|0x8000;
Config_Data[4]=Config_Data[4]|0x8000;
Config_Data[5]=0xC000;
Config_Data[6]=0xE000;
for(k=0;k<8;k++)
{
AD9833_Send_Word(Config_Data[k]);
}
} |
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