ADC转换，改变电压，LED不会改变

你好！我正在尝试一个通过ADC转换来控制LED的小实验，但是我遇到了一个小问题。设备：PIC16F1824MPLAB X:V3.60编译器：XC8 V1.42目的：测量的信号是从2.8V到4.2VSeSENT1的电压：2.8V~3.3V LeD1，LeD2 OFF，LeD3 OFF，LeD4 OFF，2、3、3、4、4、4、5、4、5、3、4、6、6、5、4、5、4、4、2、7、4、2、7、4、2、7、5、2、4、2、2、4、2、4、2、4、5的问题：是正确的，那么无论我改变了电压，LED不会改变。例如，第一个信号是3.8V，ReD1～5是ON，然后我把电压改变到2.8，所有的LED都不会改变。这是我的源代码：Mc.C:Health.H:ADC.C:St.C.：我怀疑ADC只对它进行过一次采样，但是ADC功能在while循环中。



      以下为原文

    Hi!, I'm trying a little experiment that controlling led by adc conversion, but a little problem comes to me.

device: PIC16F1824
MPLAB X: v3.60
compiler: xc8 v1.42

purpose: The measured signal is the voltage which value is ranged from 2.8v to 4.2v
segment1: 2.8v~3.3v LED1 on, LED2 off, LED3 off, LED4 off, LED5 off
segment2: 3.3v~3.4v LED1 on, LED2 on, LED3 off, LED4 off, LED5 off
segment3: 3.4v~3.6v LED1 on, LED2 on, LED3 on, LED4 off, LED5 off
segment4: 3.6v~3.7v LED1 on, LED2 on, LED3 on, LED4 on, LED5 off
segment5: 3.7v~4.2v LED1 on, LED2 on, LED3 on, LED4 on, LED5 on

The problem is: only the first action is correct, then whatever I changed the voltage, the LED won't change. e.g. the first signal is 3.8v and LED1~5 is on, then I changed voltage to 2.8, all LED won't change.

Here is my source code:
main.c:
#pragma config FOSC = INTOSC // Oscillator Selection (INTOSC oscillator: I/O function on CLKIN pin)
#pragma config WDTE = OFF // Watchdog Timer Enable (WDT disabled)
#pragma config PWRTE = ON // Power-up Timer Enable (PWRT enabled)
#pragma config MCLRE = ON // MCLR Pin Function Select (MCLR/VPP pin function is MCLR)
#pragma config CP = OFF // Flash Program Memory Code Protection (Program memory code protection is disabled)
#pragma config CPD = OFF // Data Memory Code Protection (Data memory code protection is disabled)
#pragma config BOREN = ON // Brown-out Reset Enable (Brown-out Reset enabled)
#pragma config CLKOUTEN = OFF // Clock Out Enable (CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin)
#pragma config IESO = OFF // Internal/External Switchover (Internal/External Switchover mode is disabled)
#pragma config FCMEN = OFF // Fail-Safe Clock Monitor Enable (Fail-Safe Clock Monitor is disabled)

// CONFIG2
#pragma config WRT = OFF // Flash Memory Self-Write Protection (Write protection off)
#pragma config PLLEN = OFF // PLL Enable (4x PLL disabled)
#pragma config STVREN = OFF // Stack Overflow/Underflow Reset Enable (Stack Overflow or Underflow will not cause a Reset)
#pragma config BORV = LO // Brown-out Reset Voltage Selection (Brown-out Reset Voltage (Vbor), low trip point selected.)
#pragma config LVP = OFF // Low-Voltage Programming Enable (High-voltage on MCLR/VPP must be used for programming)

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

#include
#include "header.h"

void main(void){
   
    unsigned char low_adc_result = 0;
    unsigned char high_adc_result = 0;
    unsigned int total_adc_result = 0;
    System_set();
    ADC_set();
    //Interrupt_set();
    while(1){
        ADC_start();
        low_adc_result = ADRESL;
        high_adc_result = ADRESH;
        VOLTAGE = ( (high_adc_result << 8) | low_adc_result);

     
            if(VOLTAGE >= 571.43　&& VOLTAGE < 673.47){ // 2.8v~3.3v
                LED1 = 0; // LED1 on
                LED2 = 1;
                LED3 = 1;
                LED4 = 1;
                LED5 = 1;
            }
            if(VOLTAGE >= 673.47 && VOLTAGE < 693.88){ // 3.3v~3.4v
                LED1 = 0;
                LED2 = 0;
                LED3 = 1;
                LED4 = 1;
                LED5 = 1;
            }
            if(VOLTAGE >= 693.88 && VOLTAGE < 734.7){ // 3.4v~3.6
                LED1 = 0;
                LED2 = 0;
                LED3 = 0;
                LED4 = 1;
                LED5 = 1;
            }
            if(VOLTAGE >= 734.7 && VOLTAGE < 755.1){ // 3.6v~3.7v
                LED1 = 0;
                LED2 = 0;
                LED3 = 0;
                LED4 = 0;
                LED5 = 1;
            }
            if(VOLTAGE >= 755.1){ // 3.7v~
                LED1 = 0;
                LED2 = 0;
                LED3 = 0;
                LED4 = 0;
                LED5 = 0;
            }
    }
}
header.h:
#define VOLTAGE total_adc_result
#define LED1 LATCbits.LATC1
#define LED2 LATCbits.LATC2
#define LED3 LATCbits.LATC3
#define LED4 LATCbits.LATC4
#define LED5 LATCbits.LATC5
#define button PORTCbits.RC0

void System_set(void);
void ADC_set(void);
void Interrupt_set(void);
void ADC_start(void);

adc.c:
#include
#include "header.h"
void ADC_set(void)
{
    /*Port configuration*/
    TRISAbits.TRISA2 = 1; // input for analog signal
    ANSELAbits.ANSA2 = 1; // 1 = Analog input. Pin is assigned as analog input(1). Digital input buffer disabled.
    /*ADC module configuration*/
    ADCON1bits.ADCS = 0b111; // 111 = FRC (clock supplied from a dedicated RC oscillator)
    ADCON1bits.ADPREF = 0b00; // 00 = VREF+ is connected to VDD
    ADCON1bits.ADNREF = 0; // 0 = VREF- is connected to VSS
    ADCON0bits.CHS = 0b00010; // 00010 = AN2
    ADCON0bits.ADON = 1; // 1 = ADC is enabled
    ADCON1bits.ADFM = 1; // 1 = right justified
}
void ADC_start(void)
{
    //the delay instruction for wating acquisition time
    ADCON0bits.GO_nDONE = 1; // start converting
    while(PIR1bits.ADIF != 0); // waiting for completion
    PIR1bits.ADIF = 0;
}

system.c:
#include
#include "header.h"
void System_set(void)
{
    /*Oscillator configuration*/
    OSCCONbits.SCS = 0b00; // Clock determined by FOSC<2:0> in Configuration Word 1.
    OSCCONbits.IRCF = 0b1101; // Internal Oscillator Frequency Select, Fosc = 4MHz
    /*Port configuration*/
    TRISCbits.TRISC0 = 1; // button
    TRISCbits.TRISC1 = 0; // LED control
    TRISCbits.TRISC2 = 0; // LED control
    TRISCbits.TRISC3 = 0; // LED control
    TRISCbits.TRISC4 = 0; // LED control
    TRISCbits.TRISC5 = 0; // LED control

    TRISAbits.TRISA2 = 1;
}

I suspected that the adc only sampled it once, but adc function is inside the while loop.

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