ADC p24f16ka101错误值芯片

Question

我有微芯片TECNOLOGY的PIC p24f16ka101的ADC问题 http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en539798

我期望的值为0在断点处，但有越来越多的价值，其稳定在约900。 AN2（RB0）引脚直接连接到地，vref + vref-与vdd和vss相同。

我很牛逼，我有什么错我

#include <stdio.h> 
#include <stdlib.h> 

#include <p24F16KA101.h> 
#include "config_debug.h" 

//<editor-fold defaultstate="collapsed" desc=" DEFINES "> 
#define TRIS_LEDG _TRISA2 
#define TRIS_LEDR _TRISA3 
#define TRIS_DIMMER _TRISA6 

#define LEDG _LATA2 
#define LEDR _LATA3 
#define DIMMER _LATA6 
//</editor-fold> 

void initADC(){ 
    _ADC1MD = 0; 
    SRbits.IPL = 2; //CPU > 1, no lvl 1 ISRs occur 

    AD1CON1bits.ADON = 0; // turn ADC ON 
    Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); 
    AD1PCFG = 0b1111111111111000; // AN2 as analog, all other pins are digital 
    AD1CON1 = 0x80E0; // SAMP bit = 0 ends sampling and starts converting 
    AD1CHS = 0x0002; // Connect AN2 as S/H+ input 
    // in this example AN2 is the input 
    AD1CSSL = 0; 
    AD1CON3 = 0x0002; // Manual Sample, Tad = 3Tcy 
    AD1CON2 = 0x6000; 
    Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); 
    AD1CON1bits.ADON = 1; // turn ADC ON 
    Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); Nop(); 

    _TRISA0 = 1; // vref+ 
    _TRISA1 = 1; // vref- 
    _TRISB0 = 1; // an battery 

    IFS0bits.AD1IF = 0; // Clear A/D conversion interrupt. 
    // Configure A/D interrupt priority bits (AD1IP<2:0>) here, if 
    // required. Default priority level is 4. 
    IEC0bits.AD1IE = 1; 
} 

void __attribute__ ((__interrupt__)) _ADC1Interrupt(void) 
{ 
    int done = _DONE; 
    int samp = _SAMP; 
    int adc0 = ADC1BUF0; 
    int adc1 = ADC1BUF1; 
    int adc2 = ADC1BUF2; 
    int adc3 = ADC1BUF3; 
    Nop(); 
    Nop(); 
    Nop(); 
    IFS0bits.AD1IF = 0; 
    _SAMP = 1; 
} 

int main(int argc, char** argv) { 

    _RCDIV = 0; 
    _SPIEN = 0; 

    initADC(); 

    _SAMP = 1; 

    while(1){ 
     Nop(); 
    } 
    return (EXIT_SUCCESS); 
} 

不知道，这是我的配置

// PIC24F16KA101 Configuration Bit Settings 
// 'C' source line config statements 
#include <xc.h> 
// FBS 
#pragma config BWRP = OFF // Table Write Protect Boot (Boot segment may be written) 
#pragma config BSS = OFF // Boot segment Protect (No boot program Flash segment) 
// FGS 
#pragma config GWRP = OFF // General Segment Code Flash Write Protection bit (General segment may be written) 
#pragma config GCP = OFF // General Segment Code Flash Code Protection bit (No protection) 
// FOSCSEL 
#pragma config FNOSC = FRCPLL // Oscillator Select (Fast RC oscillator with divide-by-N with PLL module (FRCDIV+PLL)) 
#pragma config IESO = ON // Internal External Switch Over bit (Internal External Switchover mode enabled (Two-Speed Start-up enabled)) 
// FOSC 
#pragma config POSCMOD = NONE // Primary Oscillator Configuration bits (Primary oscillator disabled) 
#pragma config OSCIOFNC = ON // CLKO Enable Configuration bit (CLKO output signal is active on the OSCO pin) 
#pragma config POSCFREQ = HS // Primary Oscillator Frequency Range Configuration bits (Primary oscillator/external clock input frequency greater than 8 MHz) 
#pragma config SOSCSEL = SOSCHP // SOSC Power Selection Configuration bits (Secondary oscillator configured for high-power operation) 
#pragma config FCKSM = CSDCMD // Clock Switching and Monitor Selection (Both Clock Switching and Fail-safe Clock Monitor are disabled) 
// FWDT 
#pragma config WDTPS = PS32768 // Watchdog Timer Postscale Select bits (1:32,768) 
#pragma config FWPSA = PR128 // WDT Prescaler (WDT prescaler ratio of 1:128) 
#pragma config WINDIS = OFF // Windowed Watchdog Timer Disable bit (Standard WDT selected; windowed WDT disabled) 
#pragma config FWDTEN = ON // Watchdog Timer Enable bit (WDT enabled) 
// FPOR 
#pragma config BOREN = BOR3 // Brown-out Reset Enable bits (Brown-out Reset enabled in hardware; SBOREN bit disabled) 
#pragma config PWRTEN = ON // Power-up Timer Enable bit (PWRT enabled) 
#pragma config I2C1SEL = PRI // Alternate I2C1 Pin Mapping bit (Default location for SCL1/SDA1 pins) 
#pragma config BORV = V18 // Brown-out Reset Voltage bits (Brown-out Reset set to lowest voltage (1.8V)) 
#pragma config MCLRE = ON // MCLR Pin Enable bit (MCLR pin enabled; RA5 input pin disabled) 
// FICD 
#pragma config ICS = PGx3 // ICD Pin Placement Select bits (PGC3/PGD3 are used for programming and debugging the device) 
// FDS 
#pragma config DSWDTPS = DSWDTPSF // Deep Sleep Watchdog Timer Postscale Select bits (1:2,147,483,648 (25.7 Days)) 
#pragma config DSWDTOSC = LPRC // DSWDT Reference Clock Select bit (DSWDT uses LPRC as reference clock) 
#pragma config RTCOSC = SOSC // RTCC Reference Clock Select bit (RTCC uses SOSC as reference clock) 
#pragma config DSBOREN = ON // Deep Sleep Zero-Power BOR Enable bit (Deep Sleep BOR enabled in Deep Sleep) 
#pragma config DSWDTEN = ON // Deep Sleep Watchdog Timer Enable bit (DSWDT enabled) 

Answer 1

解决。

更改AD1CON3以使用内部adc时钟。