ad8.c

c8051f020单片机的例程

//参考程序B.WADC1.c程序模/数转化通道AIN1.0的输入值
#include <c8051f020.h>                  

#define SYSCLK       22118400          // SYSCLK frequency in Hz
#define SAMPLE_RATE  50000             // Sample frequency in Hz

bit LCDBit;
unsigned long x;
void PORT_Init (void);
void Timer3_Init (int counts);
void ADC_Init(void);
void ADC_ISR (void);

void SYSCLK_Init()
{   
    unsigned int i;
    OSCXCN=0X67;         //0X67=0110,0111
	for(i=0;i<256;i++);         //等待>1ms
	while(!(OSCXCN&0X80));      //等待XTLVLD变为1
	OSCICN=0X88;         //时钟失效监测器，选择外部时钟源作为系统时钟
}

void PORT_Init()
{
    XBR0 = 0x04;
	XBR1=0X00;
	XBR2=0X40;

	 
}
void UART0_Init()
{
    SCON0=0x50;            //0101,0000
    TMOD=0X20;             //0010,0000
	TH1=0xF4;
	TL1=0xF4;
	ES0=1;               //开启串口中断0
	TF1=0;
	TR1=1;               //定时器启动
    PCON=0X00;
    TI0=1;

}

void main (void) {
	
   WDTCN = 0xde;
   WDTCN = 0xad;   	//禁止看门狗定时器

    SYSCLK_Init();
	PORT_Init();
	UART0_Init();
  
    ADC_Init(); //AD转换初始化
    AMX1SL =0x00;//选择通道0
    for(x=0;x<=50000;x++); 
	
    while (1)
	{  
	for(x=0;x<=50000;x++); 
	
    ADC1CN  |=0X10	;//启动AD转换
    while( ADC1CN==0X90);//判断AD转换是否完成
	SBUF0=0X01;
    while(TI0==0);

	TI0=0;
	SBUF0=ADC1;//向上位发送AD转换8位数据
    while(TI0==0);
	TI0=0;

	


	}
   
}	 

void ADC_Init(void)
{
 ADC1CN  |=0x80;	/*ADC1使能，软件使能模/数转换*/
 REF0CN |=0x07;		/*内部电压基准提供从VREF脚输出，ADC1电压基准取自VREF0*/
 ADC1CF = (SYSCLK/2500000) << 3;		/*转换周期为一个时间系统,增益为1*/
 ADC1CF&=0xf8; 
 ADC1CF|=0x01; 


 
}