AVR query mode A/D conversion test program-EEWORLD

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/*============================================================

File Name ：main.c
illustrate:
1. Query mode A/D conversion test program
=============================================================*/
#include 
#include 
#define uchar unsigned char
#define uint unsigned int
uint AdcConvert(void)
{
 unsigned char i;
 unsigned int ret;
 ADMUX=0X40; //Internal 2.56V reference voltage, channel 0
 ADCSRA=_BV(ADEN); // Enable ADC, single conversion mode ADEN=7
 ADCSRA|=_BV(ADSC); //ADC starts converting ADSC=6
 while(ADCSRA&_BV(ADSC)) ; // Wait for the conversion to end
 right=ADCL;
 ret|=(uint)(ADCH<<8);
 ret=ret/4; // Convert 10 bits to 8 bits, and use 8 LEDs to display the result
 ADCSRA=0; // Turn off ADC
 return right;
}
int main(void)
{
DDRF=0x00;
DDRA=0XFF;
while(1)
{
PORTA=AdcConvert();
}
}

Keywords：AVR Reference address：AVR query mode A/D conversion test program

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