PIC18F25K80用mplab x 调试ad程序读数不正常

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catfay226| 实习生

楼主 | 2017-4-19 20:55 | 只看该作者回帖奖励

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mplab, AD, 调试, PIC18F25K80, dc

PIC18F25K80用mplab x 调试ad程序读数不正常，基准电源设外部电压、内部电压、得到的值一直都是10以下的数据，请大神帮忙看下哪里出问题了，万分感谢
外部晶振8M，ad通道是AN0
主程序：
while (1)
{
      // Add your application code
      Adresult=ADC_GetConversion(channel_AN0);//0V-5V  0-1024


      ledshan(Adresult);IO_RB2_SetHigh();delay500ms();
}

子程序（是软件自动生成的）：
adc_result_t ADC_GetConversion(adc_channel_t channel)
{
// Select the A/D channel
ADCON0bits.CHS = channel;

// Turn on the ADC module
ADCON0bits.ADON = 1;

// Start the conversion
ADCON0bits.GO_nDONE = 1;

// Wait for the conversion to finish
while (ADCON0bits.GO_nDONE)
{
}

// Conversion finished, return the result

return ((ADRESH << 8) + ADRESL);
}

初始化程序（系统自动生成的）：
void PIN_MANAGER_Initialize(void)
{
/**
LATx registers
*/
LATA = 0x00;
LATB = 0x00;
LATC = 0x00;

/**
TRISx registers
*/
TRISA = 0xEF;
TRISB = 0xFB;
TRISC = 0xFF;

/**
ANSELx registers
*/
ANCON0 = 0x1F;
ANCON1 = 0x07;

/**
WPUx registers
*/
WPUB = 0xFF;

}
void OSCILLATOR_Initialize(void)
{
// SCS FOSC; HFIOFS not stable; IDLEN disabled; IRCF 8MHz_HF;
OSCCON = 0x60;
// SOSCGO disabled; MFIOSEL disabled; SOSCDRV Low Power;
OSCCON2 = 0x00;
// INTSRC INTRC; PLLEN disabled; TUN 0;
OSCTUNE = 0x00;
// ROSEL System Clock(FOSC); ROON disabled; ROSSLP Disabled in Sleep mode; RODIV Fosc;
REFOCON = 0x00;
// Set the secondary oscillator

}
void ADC_Initialize(void)
{
// set the ADC to the options selected in the User Interface

// GO_nDONE stop; ADON enabled; CHS AN0;
ADCON0 = 0x01;

// TRIGSEL ECCP1; VNCFG AVSS; VCFG internal_2.048V; CHSN AN0;
ADCON1 = 0x21;

// ADFM Right; ACQT 4_Tad; ADCS FOSC/8;
ADCON2 = 0x91;

// ADRESH 0;
ADRESH = 0x00;

// ADRESL 0;
ADRESL = 0x00;

}

使用特权