adc_no_i.c

avr gcc adc source code examples

#include <io.h>
#include <sig-avr.h>


/**********************************************************************
Title 	     :	adcnv_avg
Purpose      :	Gets an ADC Conversion Value and Returns it. 
		Maximum number of averages = 64.
In	     :	Number of averages to take when converting.
Out	     :	16-Bit word containing current ADC conversion value
Rev	     :	1.2
Mod History  :  1.0 - Original Version
             :  1.1 - Result is now the average of four samples.
             :  1.2 - User supplies number of averages.
**********************************************************************/
unsigned int adcnv_avg (unsigned char AVG_Number)
{
   unsigned char ADCSR_data,ADCH_data,ADCL_data,i;    // ADC Register Variables 
   unsigned int ADC_16;				                    // Variable that holds 16 bit ADC Value 
   ADC_16 = 0;                              // Initialise this variable to zero.
   for(i=0;i<AVG_Number;i++)                // Were taking the average AVG_Number samples.
   {
      outp((BV(ADEN)|BV(ADSC)|0x07),ADCSR); 	                                 // Start a conversion 
      do ADCSR_data = inp(ADCSR); while( (BV(ADIF) & ADCSR_data) != 0x10);    // Get the ADC Value
      outp(BV(ADIF)|ADCSR_data,ADCSR);                                        // Clear the ADC conv interupt bit 
      ADCL_data= inp(ADCL); 			                                          // Read the Low Byte 
      ADCH_data= inp(ADCH); 			                                          // Read the High Byte 
      ADC_16 = ((ADCH_data * 0x100) + ADCL_data) + ADC_16;                    // Convert the two 8-bit bytes into a 16 bit word 
            
   }
   ADC_16 = ADC_16 / AVG_Number;             // We are taking the average of AVG_Number samples.
   return(ADC_16); 			                  // Return the 16-Bit Word 
}

/*unsigned int adcs()
{
        unsigned int data_com,temp1,temp2,data_disp,data_record;
        unsigned char i;
        data_com = 0;
        for (i=0;i<3;i++)
                {
                temp1=adcnv_avg(8);
               // WDR();
                while (temp1!=temp2)    //以相邻两次想等为准
                        {
                        temp2 = temp1;
                        temp1= adcnv_avg(8);
                        };
                data_com += temp1;      //连续做3次
                };
        data_record += data_com/3;      //data_record全局变量或静态变量
        data_disp = data_record/3;      //第二求平均
        data_record -= data_disp;       //纪录中减少一次，以备下一次用
        return(data_disp);
}
*/