adc_test.c

基于ARM9芯片的一个简单的GPRS测试程序

/*********************************************************************************************
* File：	adc_test.c
* Author:	embest
* Desc：	S3C2410 ADC Test 
* History:	
*			H.T.Zhang, Programming modify, September 14, 2005
*********************************************************************************************/
/*------------------------------------------------------------------------------------------*/
/*                                     include files	                                    */
/*------------------------------------------------------------------------------------------*/
#include "2410lib.h"
#include "demo.h"
#include "lcd.h"
/*------------------------------------------------------------------------------------------*/
/*                                     constants define                                     */
/*------------------------------------------------------------------------------------------*/
#define REQCNT 100							
#define ADC_FREQ 2500000
#define LOOP 10000

/*------------------------------------------------------------------------------------------*/
/*                                    variables declare                                     */
/*------------------------------------------------------------------------------------------*/
volatile UINT8T unPreScaler;
volatile char nEndTest;
/*********************************************************************************************
* name:		adc_test
* func:		ADC convert test
* para:		none
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void adc_test(void)
{
	int i;
	char buf[60];
	UINT16T usConData;
	float usEndData;
 
	uart_printf("\n Adc Conversion Test Example (Please look at 8-seg LED)\n");	
	uart_printf(" ADC_IN Test,channel 2\n");
	uart_printf(" ADC conv. freq. = %dHz\n",ADC_FREQ);
	sprintf(buf,"ADC conversion freq. = %dHz",ADC_FREQ); 
	lcd_disp_ascii8x16(20,75,BLUE,(UINT8T *)buf);
	unPreScaler = PCLK/ADC_FREQ -1;	
	rADCCON=(1<<14)|(unPreScaler<<6)|(2<<3)|(0<<2)|(1<<1);//enable prescaler,ain2,normal,start by read
	uart_printf(" Please adjust AIN2 value!\n");
	uart_printf(" The results of ADC are:\n");
	usConData=rADCDAT0&0x3FF;
	i = 0;	
	f_nKeyPress = 0;
   	while(!f_nKeyPress)	// any key to exit.	
	{
		while(!(rADCCON & 0x8000));
		usConData=rADCDAT0&0x3FF;
		usEndData=usConData*3.3000/0x3FF;
		sprintf(buf,"Ain2 = %1.4f", usEndData);
		lcd_clr_rect(110,105+16*i,220,105+16*(i+1),BLUE);
		lcd_disp_ascii8x16(110,105+16*i,WHITE,(UINT8T *)buf);
		if (++i > 4) i = 0;
				
		delay(10000);
	}
	uart_printf(" end.\n");
}