//====================================================================
// 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 "option.h"
#include "2440addr.h"
#include "2440lib.h"
#include "2440slib.h"
#define REQCNT 100 //May 08, 2002 SOP
#define ADC_FREQ 2500000
//#define ADC_FREQ 1250000
//#define LOOP 1
#define LOOP 10000
volatile U32 preScaler;
//==================================================================================
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 );
}
//==================================================================================
void Test_Adc(void)
{
int a0=0; //Initialize variables
U32 rADCCON_save = rADCCON;
Uart_Printf( "ADC INPUT Test, press ESC key to exit !\n" ) ;
preScaler = ADC_FREQ;
Uart_Printf("ADC conv. freq. = %dHz\n",preScaler);
preScaler = 50000000/ADC_FREQ -1; //PCLK:50.7MHz
Uart_Printf("PCLK/ADC_FREQ - 1 = %d\n",preScaler);
while( Uart_GetKey() != ESC_KEY )
{
a0=ReadAdc(0);
Uart_Printf( "AIN0: %04d\n", a0 );
Delay( 500 ) ;
}
//rADCCON=(0<<14)|(19<<6)|(7<<3)|(1<<2); //stand by mode to reduce power consumption
rADCCON = rADCCON_save;
Uart_Printf("\nrADCCON = 0x%x\n", rADCCON);
}
