adc.c

来自「s3c2410 AD 串口 bootloader」· C语言 代码 · 共 25 行

#include"Adc.h"

#define LOOP 10000

volatile uint32 preScaler=100;

int ReadAdc(int ch)
{
    int i;
    static int prevCh=-1;

    rADCCON = (1<<14)|(preScaler<<6)|(ch<<3);	//setup channel
    if(prevCh!=ch)
	    {
			rADCCON = (1<<14)|(preScaler<<6)|(ch<<3);   //setup channel
			for(i=0;i<LOOP;i++);	//delay to set up the next channel
			prevCh=ch;
	    }
    rADCCON|=0x1;   //start ADC
    while(rADCCON & 0x1);	//check if Enable_start is low
    while(!(rADCCON & 0x8000));	//check if EC(End of Conversion) flag is high
    return ( (int)rADCDAT0 & 0x3ff );
}