ad.c

增量式模糊PID控制方法AVR单片机mega16

#define AD_C
#include "includes.h"
unsigned char  adc_mux = 0x01 ;

/******************************************************************************/
/******************************************************************************/
void init_adc(void)
{	

    //WDR();       //看门狗计数清零
    //WDTCR=0x0F;  //使能watchdog,并且，采用2048K分频，典型溢出时间5V时2.1S
    // ADCSRA=0X00;
    ADCSR = 0x00; 
    //ADMUX =(adc_mux&0x1f)|(1<<REFS0)|(1<<REFS1);  //参考电压为内部2.56
    ADMUX =(adc_mux&0x1f)|(1<<REFS0);  //参考电压为内部AVCC
    //ADMUX =(adc_mux&0x1f);  //参考电压为引脚AREF
    ADCSR=(1<<ADEN)|(1<<ADSC)|(1<<ADIE)|(1<<ADPS2)|(1<<ADPS1) ;//64分频
    asm("sei");
    //UBRRH = 25;
    UBRRL = 25;
    UCSRB=0x18;    
    UCSRC=0x86;	 
	/*
	 ADCSR = 0x00; //disable adc
     ADMUX = 0x00; //select adc input 0
     ACSR  = 0x80;
     ADCSR = 0xEE;
	 */
}
 //ADC完成中断
/******************************************************************************/
#pragma interrupt_handler adc_isr:15
void adc_isr(void)
{
 //conversion complete, read value (int) using...
 // value=ADCL;            //Read 8 low bits first (important)
 // value|=(int)ADCH << 8; //read 2 high bits and shift into top byte
 ADMUX =(adc_mux&0x1f)|(1<<REFS0)|(1<<REFS1);
 ADCSR|=(1<<ADSC);//启动AD转换
}
/******************************************************************************/