main.c

从零开始学51单片机源代码

#include "fun.h"   

void  ADC_interrupt() interrupt 5
{
	ADC_CONTR &= 0Xef;	//ADC_FLAG清零 
	//计算电压值 
	ad_result10 = ADC_RES;
	ad_result10 = ( ad_result10 << 2 ) | ADC_RESL;
	vin = ad_result10 * 5.0 / 1024 ; //ad_result10 = 1024 × ( Vin / 5v )
	/*
	  第一段 1.7V~2.1V， 
	  第二段2.8~3.2V
	  第三段3.8~4.2V
	*/
	 if (vin>=1.7 && vin<=2.1)	//低速挡 
	 {
	   	duty_level = 1;	//占空比30%
		CCAP0H =  255 - 255 * duty[duty_level] / 100;
		CCAP0L =  CCAP0H;
	 }
	 else if(vin>=2.8 && vin<=3.2)	//中速挡 
	 {
	  	duty_level = 2;	//占空比50%
		CCAP0H =  255 - 255 * duty[duty_level] / 100;
		CCAP0L =  CCAP0H;
	 }
	 else if(vin>=3.8 && vin<=4.2)	//高速挡 
	 {
	  	duty_level = 3;	//占空比80%
		CCAP0H =  255 - 255 * duty[duty_level] / 100;
		CCAP0L =  CCAP0H;
	 }
	 else//其它异常情况 
	 {
		duty_level = 0;	//占空比0%
		CCAP0H =  255 - 255 * duty[duty_level] / 100;
		CCAP0L =  CCAP0H;
	 }
}

void  Timer0_interrupt() interrupt 1
{
	//重装初值 
 	TH0 = T0_50ms >> 8;
 	TL0 = T0_50ms;
	cntint0++;
	
	if(cntint0 >=10)//500ms
	{
	 	ADC_CONTR |= 0X08;	//ADC_START=1，启动ad转换
		cntint0=0;
	}
}

main()
{
	ms_delay(100);
	init_port();
	init_timer0();
	init_pca();
	init_adc();

	cntint0=0;
	IE |= 0x20; //EADC=1,打开adc中断 
	EA = 1;//开总中断 

	

	while(1)
	{
		
	}
}