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Can somebody find the bug in this code?

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Here is my code and I have attached my Project files.

MCU PIC18F4580
Fosc 16 MHz

myflt contains the adc value and it is compared with values in V[]? If any value matches then ctr is incremented and if ctr > 0 i.e, if any value matches then LED turns ON. Upto here it is working fine but when I change the adc value then LED doesn't turn OFF even if myflt doesn't match with any value of V[].


Code C - [expand]
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#include <p18f4580.h>
#include <delays.h>
#include <math.h>
 
#pragma config WDT = OFF
#pragma config OSC = HS
#pragma config PWRT = ON
#pragma config LVP = OFF
 
#define ldata PORTD
#define rs PORTBbits.RB0 //define reset bit
#define rw PORTBbits.RB1 //define read/write bit
#define en PORTBbits.RB2 //define enable bit
 
//TCY = 0.25 us
 
//Function prototypes
void float2string(float fp_num);
void adc_read();
void Delay10TCYx(unsigned char unit);
void Delay100TCYx(unsigned char unit);
void Delay1KTCYx(unsigned char unit);
void Delay10KTCYx(unsigned char unit);
void lcdinit();
void lcdcmd (char value);
void lcddata(char value);
void lcdstring(unsigned char *lcd_data);
void MSDelay(int itime);
 
float V[9] = {3.31, 3.32, 3.33, 3.34, 3.35, 3.36, 3.37, 3.38, 3.39};
float I[8] = {0,5,6,16.69,3.94,3,3, 32.44};
float R[9] = {0, 1.1, 1.21, 1.37 ,1.32, 1.50, 1.35, 1.6, 1};
unsigned char disp[] = "ADC Value = ", ctr = 0;
unsigned int adc_val = 0;
unsigned char myString[8];
unsigned int iladc_val = 0, i = 0;
float dladc_val = 0.0, old_val, myflt;
 
//Function Definition
//Sub Function
void float2string(float fp_num){
        long int befdec, aftdec;
        
        fp_num = ceil(fp_num * 100) / 100;
        myflt = fp_num;
        
        befdec = fp_num;                      // Fractional part is truncated
                                                // 12.163456 becomes 12
        aftdec = fp_num * 100;            // 12.163456 becomes 1216
        aftdec = aftdec - (befdec * 100);   // 1216 - 1200 = 16
 
 
        if (fp_num < 1) {
                myString[0] = '0';
                myString[1] = '.';
                myString[2] = (aftdec/10) + 48;
                myString[3] = (aftdec/1)%10 + 48;
                myString[4] = '\0';
                myString[5] = ' ';
                myString[6] = ' ';
                myString[7] = '\0';
 
        }
 
        else if ((fp_num >= 1) && (fp_num < 10)) {
                myString[0] = (befdec/1)%10 + 48;
                myString[1] = '.';
                myString[2] = (aftdec/10) + 48;
                myString[3] = (aftdec/1)%10 + 48;
                myString[4] = '\0';
                myString[5] = '\0';
                myString[6] = '\0';
                myString[7] = '\0';
 
        }
 
        else if ((fp_num >= 10) && (fp_num < 100)) {
                myString[0] = (befdec/10) + 48;
                myString[1] = (befdec/1)%10 + 48;
                myString[2] = '.';
                myString[3] = (aftdec/10) + 48;
                myString[4] = (aftdec/1)%10 + 48;
                myString[5] = '\0';
                myString[6] = ' ';
                myString[7] = '\0';
 
        }
 
        else if ((fp_num >= 100) && (fp_num < 1000)) {
                myString[0] = (befdec/100) + 48;
                myString[1] = (befdec/10)%10 + 48;
                myString[2] = (befdec/1)%10 + 48;
                myString[3] = '.';
                myString[4] = (aftdec/10) + 48;
                myString[5] = '\0';
                myString[6] = ' ';
                myString[7] = '\0';
 
        }
 
        else if ((fp_num >= 1000) && (fp_num < 10000)) {
                myString[0] = (befdec/1000) + 48;
                myString[1] = (befdec/100)%10 + 48;
                myString[2] = (befdec/10)%10 + 48;
                myString[3] = (befdec/1)%10 + 48;
                myString[4] = '.';
                myString[5] = (aftdec/10) + 48;
                myString[6] = ' ';
                myString[7] = '\0';
 
        }
 
        else if ((fp_num >= 10000) && (fp_num < 100000)) {
                myString[0] = (befdec/10000) + 48;
                myString[1] = (befdec/1000)%10 + 48;
                myString[2] = (befdec/100)%10 + 48;
                myString[3] = (befdec/10)%10 + 48;
                myString[4] = (befdec/1)%10 + 48;
                myString[5] = '.';
                myString[6] = (aftdec/10) + 48;
                myString[7] = '\0';
 
        }
 
 
}
 
void adc_read()
{
    
    ADRESL = 0x00;
    ADRESH = 0x00;
    ADCON0bits.ADON = 1;
    Delay100TCYx(200);
    ADCON0bits.GO = 1;
    while(ADCON0bits.GO);
    ADCON0bits.ADON = 0;
    iladc_val = ADRESH;        // copy high byte to result
    iladc_val <<= 8;           // shift low byte to 2nd byte
    iladc_val |= ADRESL;       // OR result with ADRESL to get both the bytes into one var.
    Delay100TCYx(200);
    dladc_val = (float)iladc_val;
    dladc_val = dladc_val * 0.0048875855327468;
    float2string(dladc_val);
    
}
 
void lcdinit(){
    lcdcmd(0x0E); // display and cursor ON.Writing 0x0F makes the cursor blink
    MSDelay(15); //delay
    lcdcmd(0x01); // this is to clear LCD
    MSDelay(15);
    lcdcmd(0x06); // shift the cursor to right
    MSDelay(15);
    lcdcmd(0x80); //line 1, position 0
    MSDelay(1);
}
 
void lcdcmd(char value)
{
    ldata = value;  // put the value on the pins of PORTD
    rs = 0;
    rw = 0;
    en = 1;         // strobe enable pin
    MSDelay(1);
    en = 0;
}
 
void lcddata (char value)
{
    ldata = value;  //put the value on the pins of PORTD
    rs = 1;
    rw = 0;
    en = 1;         // strobe enable pin
    MSDelay(1);
    en = 0;
}
 
void lcdstring(unsigned char *lcd_data){
    unsigned char cllcd_data;
 
    while(*lcd_data){
        cllcd_data = *lcd_data;
        lcddata(cllcd_data);
        lcd_data++;
    }
}
 
 
void MSDelay(int itime)
{
    unsigned int i,j;
 
    for(i=0;i<itime;i++)
        for(j=0;j<135;j++);
}
 
 
 
void main(){
    TRISA = 0x01;
    PORTA = 0x00;
    LATA = 0x00;
    TRISB = 0x00;
    PORTB = 0x00;
    LATB = 0x00;
    TRISD = 0x00;
    PORTD = 0x00;
    LATD = 0x00;
    ADCON0 = 0x00;
    ADCON1 = 0x0E;
    ADCON2 = 0xB6;
    CMCON = 0x00;
 
    lcdinit();
 
    while(1){
 
        adc_read();
        if(dladc_val != old_val){
              lcdcmd(0x01);
              Delay100TCYx(50);
              lcdcmd(0x80);
              Delay100TCYx(50);
              lcdstring(&myString);
 
              for(i = 0; i < 9; i++){
                    if(myflt == V[i]){
                        ctr++;
                        if(ctr > 0){
                            PORTBbits.RB7 = 1;
                        }
                        else{
                            PORTBbits.RB7 = 0;
                        }
                    }                    
              }
              ctr = 0;
              myflt = 0.0;
              old_val = dladc_val;
        }
        
    }
}

 

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spudboy488

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You're not clearing ctr prior to your for-next loop. Once the first match is found, it will always be greater then 0 (for at least 254 more iterations).
 

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After coming out of for loop I am clearing ctr and if adc value changes then only the for loop is executed again. for loop compares adc value (myflt) with all the elements of V[] and only if there is a match then ctr becomes positive and LED turns ON. Let us assume that adc value is 3.35 and a match has occured and LED is ON. Now if value is changed then for loop executes and compares again. If there is match again then ctr previously cleared becomes positive.

@spudboy488

See after for loop I have use ctr = 0;
 

vijay rayabarapu

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Hi every on in forum...

I want small information from u,i am doing my work on STM32 controller,So i am storing some important data(parameters) of 44 bytes in internal flash, my stm32 consists of 128kbytes of memory ,So my doubt is that
1. How many times(no.of cycles) can i write data on stm32 flash memory?
2. I am using internal flash right,is it safe(against corruption in data) to write data?

Thanks in advance,
 

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Excellent answer FvM. Thank you very much. I have another question. Please check my Simulation and tell why an underscore character is displayed after the adc value on LCD. I traced ever line of code but not able to find what is causing the underscore to be printed.
 

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