adc.c

S3C2410学习的基础资料 大部分实验源码及工程

//====================================================================
// File Name : Adc.c
// Function  : S3C2410 ADC Test 
// Program   : Kang, Weon Tark 
// Date      : May 22, 2002
// Version   : 0.0
// History
//   0.0 : Programming start (March 29,2002) -> KWT
//         ADC Test                          -> May 15, 2002 SOP
//====================================================================

#include "def.h"
#include "2410addr.h"
#include "2410lib.h"
#include "adc.h"

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

    //(1<<14)--> A/D converter prescaler enable.
    //(preScaler<<6)--> A/D converter prescaler value.
    //(ch<<3)--> Analog input channel select.
    rADCCON = (1<<14)|(49<<6)|(ch<<3);	//setup channel

    if(prevCh!=ch)
    {
	    for(i=0;i<1000;i++);	//delay to set up the next channel
	    prevCh=ch;
    }
    rADCCON|=0x1;   //start ADC

    while(!(rADCCON & 0x8000));	//check if EC(End of Conversion) flag is high
    //Normal ADC conversion data value: 0 ~ 3FF
    return ( (int)rADCDAT0 & 0x3ff );
}


//==================================================================================
void Test_Adc(void) 
{
    int adcdata=0; //Initialize variables
   	Uart_Printf( "\nADC INPUT Test, press ESC key to exit !\n" ) ;
    while( Uart_GetKey() != ESC_KEY )
    {
        adcdata=ReadAdc(ADC_CH);
	    Uart_Printf( "AIN%d: %04d\n", ADC_CH,adcdata );
		Delay( 2000 ) ;
    }
 }