adc.c

2440 开发板的测试程序。包括uart,iic,lcd

//====================================================================
// 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 );
}