小弟我用MEGA48V+AD9834做了一个函数发生器，写了一个控制程序，但是ad9834始终没有结果出来，恳请各位高手指点。单片机与AD9834之间的通信采用SPI接口。
程序如下：
#include <avr/io.h>
#define ulong unsigned long
#define uint unsigned int
#define uchar unsigned char
void send_byte(uchar byte)
{SPDR=byte;
while(!(SPSR&(1<<SPIF)))
;
//SPSR&=~(1<<SPIF);
}
void spi_int(void)
{DDRB=0xFF;
PORTB=(1<<PD3)|(1<<PD5);
DDRD=0xFF;
PORTD=0x04;
SPCR=0x54;
SPSR|=0x01;
}
void send_word(uint word)
{uchar word_high,word_low;
word_low=word&0x00FF;
word_high=(word&0xFF00)>>8;
asm ("cbi 0x0B,2");
send_byte(word_high);
send_byte(word_low);
asm ("sbi 0x0B,2");
}
int main(void)
{volatile ulong FRE;
volatile uint LSB;
volatile uint MSB;
FRE=0x3333333;
LSB=(FRE&0x3FFF)+0x4000; //MSB=(FRE/0x4000)+0x4000;
MSB=(FRE&0x3FFC000)>>14;
MSB+=0x4000; //LSB=(FRE%0x4000)+0x4000;
spi_int();
send_word(0x2100);
send_word(MSB);
send_word(LSB);
send_word(0x2000);
}
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