我是使用dsPICDWM 1.1 Development Board
當我要從AN0(RB0) 及Gnd輸入sin wave作A/D converter
但用以下程式卻無法執行
可是當使用RB6當輸入(即從內建的AVDD分壓所得到的值)
即可順利的執行A/D converter
不知是哪些地方沒注意到


#define __dsPIC30F6014__

#include <adc12.h>
#include <p30F6014.h>

//---------------------------------------------------------------------
// Configuration bits

_FOSC(CSW_FSCM_OFF & XT_PLL4); //XT with 4xPLL oscillator, Failsafe clock off
_FWDT(WDT_OFF); //Watchdog timer disabled
_FBORPOR(PBOR_OFF & MCLR_EN); //Brown-out reset disabled, MCLR reset enabled
_FGS(CODE_PROT_OFF); //Code protect disabled
//---------------------------------------------------------------------
#define Fcy 7370000
unsigned int i;
int ADCValue[80];


void IO_Init(void)
{
PORTB=0xFFFF;
PORTD=0xFFFF;
TRISB=0xFFFF; //all pins is input
TRISD=0xFFF0; //LED1~LED4 is output
TRISA=0xFFFF; //sw1~sw4 is input
LATD=0x000F; //all LED turn off
}
//---------------------------------------------------------------------------
void ADC_Init(void)
{
ADPCFG=0xFFFE; //RB0 is analong mode, others is digital mode
ADCON1=0x01E4;
ADCON2=0x0400;
ADCON3=0x1D3F; //sample time=125us
//Tad=32Tcy
ADCSSL=0x0001; //AN0 is input scan

ADCON1bits.ADON=1; //turn ADC on
}
//----------------------------------------------------------------
int main(void)
{
IO_Init();
ADC_Init();
for (i=0;i<=80;i++)
{
while(!IFS0bits.ADIF);
IFS0bits.ADIF=0;

ADCValue[i]=ADCBUF0;
}
}