DAC.rar_DAC

/////////DAC调试程序///////////////// /////////T2定时更新DAC1输出///////////////////// ////////DAC0为直接更新/////////////////////////// /////////DAC.c//////////////////////////////////////// #include "c8051F040.h" typedef unsigned char uchar; typedef unsigned int uint; typedef unsigned long ulong; sfr16 RCAP2=0xca; sfr16 RCAP3=0xca; sfr16 RCAP4=0xca; sfr16 TMR4=0xcc; sfr16 TMR3=0xcc; sfr16 TMR2=0xcc; sfr16 PCA0CP0=0xfb; sfr16 PCA0CP1=0xfd; sfr16 PCA0CP2=0xe9; sfr16 PCA0CP3=0xeb; sfr16 PCA0CP4=0xed; sfr16 PCA0CP5=0xe1; sfr16 ADC0VAL=0xbe; sfr16 ADC0GT=0xc4; sfr16 ADC0LT=0xc6; sfr16 DAC1VAL=0xD2; sfr16 DAC0VAL=0xD2; union tcfint16{ uint myword; struct{uchar hi;uchar low;}bytes; }myint16;//用联合体定义16位操作 void dac0_cfg(uchar cfg); void dac1_cfg(uchar cfg); void dac0_updata(uint val); void dac1_updata(uint val); void config(); void t2_ini(); void t2_baud(uint t2reload); void t2_ini(){ SFRPAGE = 0x00; TMR2CF = 0x08; // T2时钟为系统时钟 TMR2CN = 0x00; // 开启T2定时器 ET2=1;//开启T2定时器中断 } void t2_baud(uint t2reload){ SFRPAGE = 0x00; RCAP2=65536-t2reload; TMR2=RCAP2; } void dac0_cfg(uchar cfg){ SFRPAGE=0x00; DAC0CN=cfg; REF0CN|=0x03;//DAC参考电平只能由VREFD输入 } void dac1_cfg(uchar cfg){ SFRPAGE=0x01; DAC0CN=cfg; SFRPAGE=0x00; REF0CN|=0x03; } void dac0_updata(uint val){ SFRPAGE=0x00; myint16.myword=val;//利用联合体进行快速uint型数据操作 DAC0L=myint16.bytes.low; DAC0H=myint16.bytes.hi;//在直接更新模式下，此时开始更新DAC0输出 } void dac1_updata(uint val){ SFRPAGE=0x01; myint16.myword=val;//利用联合体进行快速uint型数据操作 DAC1L=myint16.bytes.low; DAC1H=myint16.bytes.hi;//在直接更新模式下，此时开始更新DAC1输出 } void config (void) { WDTCN = 0x07; // Watchdog Timer Control Register WDTCN = 0xDE; // Disable WDT WDTCN = 0xAD; SFRPAGE = 0x0F; XBR0 = 0x00; // XBAR0: Initial Reset Value XBR1 = 0x00; // XBAR1: Initial Reset Value XBR2 = 0x40; // XBAR2: Initial Reset Value XBR3 = 0x00; // XBAR3: Initial Reset Value SFRPAGE = 0x0F; P0MDOUT = 0x00; // Output configuration for P0 P1MDOUT = 0x00; // Output configuration for P1 P2MDOUT = 0x00; // Output configuration for P2 P3MDOUT = 0x00; // Output configuration for P3 P4MDOUT = 0xff; // Output configuration for P4 P5MDOUT = 0x07; // Output configuration for P5 P6MDOUT = 0x00; // Output configuration for P6 P7MDOUT = 0x00; // Output configuration for P7 P1MDIN = 0xFF; // Input configuration for P1 P2MDIN = 0xFF; // Input configuration for P2 P3MDIN = 0xFF; // Input configuration for P3 SFRPAGE = 0x0F; CLKSEL = 0x00; // Oscillator Clock Selector OSCXCN = 0x00; // EXTERNAL Oscillator Control Register OSCICN = 0x84; // Internal Oscillator Control Register //采用内部晶振，为24.5MHZ8分频 } //End of config void main(){ uchar i; config(); dac0_cfg(0x80);//dac0使能，且为立即更新方式 dac1_cfg(0x98);//dac1使能，且为t2溢出更新方式 i=0; t2_ini(); t2_baud(500);//每隔500 T2时钟更新一次DAC1输出，此时T2尚未启动 EA=1; dac0_updata(0x0800); /* DAC0输出为0.5VREFD,若VREFD与ADC0参考电压相同，则可作为HVREF参考电压输入，使得HVDA差动检测负压 */ SFRPAGE=0x00; TR2=1;//启动定时器T2 while(1); } void T2_ISR() interrupt 5{//T2定时中断，更新DAC1输出，DAC1为锯齿波输出 TF2=0; SFRPAGE=0x01; DAC1VAL++;//因为是T2溢出更新DAC1输出，所以可以sfr16操作，因为此时并不立即更新 if(DAC1VAL>=0x1000) DAC1VAL=0; }