Sin_DA.zip_C8051F120 KEIL_keil s

#include<c8051f120.h> #include<intrins.h> #include<math.h> typedef unsigned char uchar; typedef unsigned int uint; //#define pi 3.14159 uchar old_SFRPAGE; float code d_sin[]={2048.0,2447.5,2831.7,3185.8,3496.2,3750.8,3940.1, 4056.6,4095.0,4056.6,3940.1,3750.8,3496.2,3185.8, 2831.7,2447.5,2048.0,1648.5,1264.3,910.19,599.85, 345.15,155.89,39.352,0.0, 39.352,155.89,345.15, 599.85,910.19,1264.3,1648.5}; //存储DA更新数据 void delay1us() { unsigned char i=12; while(i) { _nop_();_nop_();_nop_(); --i; } } void delay10us() { unsigned char i=143; while(i) { _nop_();_nop_();_nop_(); --i; } } void delay100us() { uint i=680; while(i) { _nop_();_nop_();_nop_(); i--; } } void delay1ms() { uchar i=10; while(i) { delay100us();i--; } } void sys_int() { WDTCN=0XDE; //禁止看门狗 WDTCN = 0xAD; old_SFRPAGE = SFRPAGE; SFRPGCN=1; //SFR页选择 SFRPAGE=0XF; SFRPAGE=old_SFRPAGE; } void oscx_int() { old_SFRPAGE = SFRPAGE; SFRPAGE=0XF; OSCXCN=0X67; //外部晶振，11.0592M delay1ms(); //wait 1ms以上 while(OSCXCN&0X80!=0X80) //判断外部晶振正常工作 _nop_(); CLKSEL = 0x01; //切换到外部晶振 OSCICN = 0x00; //关闭内部晶振 SFRPAGE=old_SFRPAGE; } void pll_int() { old_SFRPAGE = SFRPAGE; SFRPAGE=0XF; PLL0CN=0X04; //PLL参考外部 SFRPAGE=0; FLSCL=0X30; // SFRPAGE=0XF; PLL0CN|=0X01; //PLL上电 PLL0DIV=1; //1分频 PLL0FLT=0X07; PLL0MUL=8; //8倍频 delay10us(); //延时5us以上 PLL0CN|=0x02; //PLL使能 while(PLL0CN&0X10!=0X10) //判断PLL频率已锁定 _nop_(); CLKSEL=0X02; //切换系统时钟为PLL SFRPAGE = old_SFRPAGE; } void port_int() { old_SFRPAGE = SFRPAGE; SFRPAGE=0x0F; XBR2=0X40; //允许交叉开关，全局弱上拉 SFRPAGE = old_SFRPAGE; } void DAC0_int() { old_SFRPAGE = SFRPAGE; SFRPAGE=0x00; REF0CN=0X03; //启用内部电压基准，2.485V DAC0CN=0X98; //使能DAC0，软件更新，数据右对齐 SFRPAGE = old_SFRPAGE; } void timer2_int() { old_SFRPAGE = SFRPAGE; SFRPAGE=0x00; TMR2L=0Xd5; TMR2H=0Xff; //timer2初值 RCAP2L=0Xd5; RCAP2H=0Xff; //捕捉寄存器初值 TMR2CF=0X10; //外部时钟/8,向上计数 TMR2CN=0X04; //使能定时器，自动重载，禁止外部使能 ET2=1; EA=1; //允许timer2中断 SFRPAGE = old_SFRPAGE; } /*****************************初始化_end**********************************/ void timer2_intr() interrupt 5 { static int j=0; static uint n=0; old_SFRPAGE = SFRPAGE; SFRPAGE=0x00; if(TF2==1) { if(n<32) { SFRPAGE=0x00; j = d_sin[n]; DAC0L = j%256; DAC0H = j/256; } ++n; // ++j; if(n==32) n=0; // if(j==8) // j=0; } TF2=0; EXF2=0; //清除中断标志 SFRPAGE = old_SFRPAGE; } /*void Set() { uint Num; for(Num=0;Num<256;Num++) { d_sin[Num]=(sin(6.28*Num/255)+1)*4096/2.485; //0~1数据 d_sin[Num] = (int)d_sin[Num]; } }*/ void main() { sys_int(); oscx_int(); pll_int(); port_int(); DAC0_int(); // Set(); timer2_int(); while(1) ; }