DDS.rar_DDS_dds扫频仪_单片机_单片机dds_扫频仪

#include "msp430x54x.h" #include "AD9850.h" extern void Init_ad9850(void); void main(void) { /** 功能：初始化系统时钟 **/ WDTCTL = WDTPW + WDTHOLD; // 关看门狗 P11SEL = BIT0+BIT1+BIT2; // P11.0 to output direction P11DIR = BIT0+BIT1+BIT2; // P11.0 to output ACLK P7SEL |= 0x03; // Select XT1 UCSCTL6 &= ~(XT1OFF); // XT1 On UCSCTL6 |= XCAP_3; // Internal load cap ///////////////设置倍频 UCSCTL3 = SELREF_0 ; UCSCTL4 = SELA_3 + SELM_3 + SELS_3; UCSCTL1 = DCORSEL_4; UCSCTL2 = 243; // Loop until XT1,XT2 & DCO stabilizes do { UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + XT1HFOFFG + DCOFFG); // Clear XT2,XT1,DCO fault flags SFRIFG1 &= ~OFIFG; // Clear fault flags }while (SFRIFG1&OFIFG); // Test oscillator fault flag UCSCTL6 &= ~(XT1DRIVE_3); // Xtal is now stable, reduce drive Init_ad9850(); while(1) { for(unsigned long kk=1000;kk<500000;kk+=100) { SetFreq(kk); delay(10); } for(unsigned long kk=500000;kk>1000;kk-=100) { SetFreq(kk); delay(10); } } }