启用CLRASAM位时ADC的奇数结果

您好，当使用CrrasAM位时，在初始中断之后不能再采样重新启动。要重新启动，我清除中断标志并将ASAM位设置为1，但采样不会再次启动，中断标志在初始中断之后未被打开。有什么想法吗？



      以下为原文

    Hello, when using the CLRASAM bit I cannot get sampling to restart again after the initial interrupt.

To restart I clear the interrupt flag and set ASAM bit to 1 but sampling does not start again and the interrupt flag never is turned on after the initial interrupt.

Any ideas?
#define Vref (float)3.3

#pragma config PMDL1WAY = ON // Peripheral Module Disable Configuration (Allow only one reconfiguration)
#pragma config IOL1WAY = ON // Peripheral Pin Select Configuration (Allow only one reconfiguration)
#pragma config FUSBIDIO = ON // USB USID Selection (Controlled by the USB Module)
#pragma config FVBUSONIO = ON // USB VBUS ON Selection (Controlled by USB Module)

// DEVCFG2
#pragma config FPLLIDIV = DIV_12 // PLL Input Divider (12x Divider)
#pragma config FPLLMUL = MUL_24 // PLL Multiplier (24x Multiplier)
#pragma config UPLLIDIV = DIV_12 // USB PLL Input Divider (12x Divider)
#pragma config UPLLEN = OFF // USB PLL Enable (Disabled and Bypassed)
#pragma config FPLLODIV = DIV_256 // System PLL Output Clock Divider (PLL Divide by 256)

// DEVCFG1
#pragma config FNOSC = FRC // Oscillator Selection Bits (Fast RC Osc (FRC))
#pragma config FSOSCEN = ON // Secondary Oscillator Enable (Enabled)
#pragma config IESO = ON // Internal/External Switch Over (Enabled)
#pragma config POSCMOD = OFF // Primary Oscillator Configuration (Primary osc disabled)
#pragma config OSCIOFNC = OFF // CLKO Output Signal Active on the OSCO Pin (Disabled)
#pragma config FPBDIV = DIV_1 // Peripheral Clock Divisor (Pb_Clk is Sys_Clk/1)
#pragma config FCKSM = CSDCMD // Clock Switching and Monitor Selection (Clock Switch Disable, FSCM Disabled)
#pragma config WDTPS = PS1048576 // Watchdog Timer Postscaler (1:1048576)
#pragma config WINDIS = OFF // Watchdog Timer Window Enable (Watchdog Timer is in Non-Window Mode)
#pragma config FWDTEN = OFF // Watchdog Timer Enable (WDT Disabled (SWDTEN Bit Controls))
#pragma config FWDTWINSZ = WINSZ_25 // Watchdog Timer Window Size (Window Size is 25%)

// DEVCFG0
#pragma config JTAGEN = ON // JTAG Enable (JTAG Port Enabled)
#pragma config ICESEL = ICS_PGx1 // ICE/ICD Comm Channel Select (Communicate on PGEC1/PGED1)
#pragma config PWP = OFF // Program Flash Write Protect (Disable)
#pragma config BWP = OFF // Boot Flash Write Protect bit (Protection Disabled)
#pragma config CP = OFF // Code Protect (Protection Disabled)

// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.

#include


#include
#include

/*
*
*/

void InitializePortA(void);
void InitializePortB(void);
void InitializeADC(void);
float convertVoltage(unsigned int ADCoutput);

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

    float measuredVoltage;
    InitializePortA();
    InitializePortB();
    InitializeADC();
    while(1)
    {
        while(IFS0bits.AD1IF == 0)
        {

        }

        measuredVoltage = convertVoltage(ADC1BUF0);
        
        if(measuredVoltage > 1)
            PORTBbits.RB14 = 1;
        else
            PORTBbits.RB14 = 0;
        
        IFS0bits.AD1IF = 0;
        AD1CON1bits.ASAM = 1;
    }
   
    return (EXIT_SUCCESS);
}

void InitializePortA(void)
{
    TRISAbits.TRISA0 = 1;
    ANSELAbits.ANSA0 = 1;
}

void InitializePortB(void)
{
    PORTBbits.RB14 = 0;
    TRISBbits.TRISB14 = 0;
   
}

void InitializeADC(void)
{
    AD1CON1bits.SSRC = 0b111; // enable auto convert.
    AD1CON1bits.ASAM = 1; // Sampling begins immediately after last conversion
   
    AD1CON2bits.SMPI = 0b1111; // 16 samples before interrupt
   
    AD1CON3bits.ADRC = 0; // Clock derivied from PBCLK
    AD1CON3bits.SAMC = 1; // 1 T_AD sample time.
    AD1CON3bits.ADCS = 0; // T_AD = 2 T_PBCLCK
    AD1CON1bits.CLRASAM = 1;
   
    AD1CON1bits.ADON = 1;
   
}

float convertVoltage(unsigned int ADCoutput)
{
    float measuredVoltage;
   
    measuredVoltage = Vref/(float)1024 * ADCoutput;
    return measuredVoltage;
}

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