About ADC programming error….

[jarry]

I’m using PIC18f4550 and for ADC programming I’m getting error as below please any onr help me 

 

 

 

\ProjectsCompleted_projectsPIC18F4550 tasksADC with LDCADClcd.c:79:Error [1105] symbol ‘GO’ has not been defined..

 

 

 

 

 

 

MY CODE IS 

 

 

 

// Program to depict working with inbuilt ADC of PIC18F4550 Microcontroller

// This code uses Channel0 (zero) of PIC’s ADC Module

 

// Configuration bits

/* _CPUDIV_OSC1_PLL2_1L,  // Divide clock by 2

   _FOSC_HS_1H,           // Select High Speed (HS) oscillator

   _WDT_OFF_2H,           // Watchdog Timer off

   MCLRE_ON_3H            // Master Clear on

*/

#include<p18f4550.h>

 

#define rs PORTAbits.RA0

#define rw PORTAbits.RA1

#define en PORTAbits.RA2

#define lcdport LATB

 

void lcd_ini();

void lcdcmd(unsigned char);

void lcddata(unsigned char);

void adc_con(unsigned int);

void adc_init();

 

unsigned char data[20]=”ADC OUTPUT=”;

unsigned int digital_out[10],avg_output=0,temp;

unsigned int i=0;

 

void Delay_ms(unsigned int dly)

{

unsigned char i;

for(;dly>0;dly–)

{

for(i=250;i>0;i–);

for(i=237;i>0;i–);

}

}

 

void adc_init()

{

    ADCON1=0x0E;                            // Make RA0/AN0 pin as analog pin (Other pins remain to be digital I/O)

    ADCON0=0x00;                            // Select Channel0 & ADC off

    ADCON2=0x8A;                            // Left justified, 2TAD acquiciation time, Fosc/32 clock option

    ADCON0bits.ADON = 1;                        // Enable ADC

ADCON0bits.GO = 1;

}

 

 

void lcd_ini()

{

    lcdcmd(0x38);        // Configure the LCD in 8-bit mode, 2 line and 5×7 font

    lcdcmd(0x0C);        // Display On and Cursor Off

    lcdcmd(0x01);        // Clear display screen

    lcdcmd(0x06);        // Increment cursor

    lcdcmd(0x80);        // Set cursor position to 1st line, 1st column

}

 

void main(void)

{

    TRISA=0x01;        // Configure RA0 as input pin

    LATA=0;

    TRISB=0;        // Configure Port B as output port

    LATB=0;

    TRISD=0;

    LATD=0;

    lcd_ini();        // LCD initialization

    while(data!=’’)

    {

        lcddata(data);      // Call lcddata function to send character one by from ‘data’ array

        i++;

    }

 

    adc_init();        //ADC Initialization

 

    while(1)

    {

 

        temp=0;

        for(i=0;i<10;i++)

        {

            ADCON0|=(1 << GO);                              // Start A/D conversion

            while(!(ADCON0 & (1 << GO)));                   // Wait until conversion gets over

            digital_out(ADRESL)|(ADRESH<<);        // Store 10-bit output into a 16-bit variable

            Delay_ms(20);

            temp=temp+digital_out;

        }

        avg_output=temp/10;                           // Take average of ten digital values for stablity

        adc_con(avg_output);                          // Function to convert the decimal vaule to its corresponding ASCII

 

    }

}

 

 

 

 

void adc_con(unsigned int adc_out)

{

    unsigned int adc_out1;

    int i=0;

    char position=0xC3;

 

    for(i=0;i<;i++)

    {

        adc_out1=adc_out%10;                     // To exract the unit position digit

        adc_out=adc_out/10;

        lcdcmd(position);

        lcddata(48+adc_out1);                    // Convert into its corresponding ASCII

        position–;

 

    }

}

 

 

void lcdcmd(unsigned char cmdout)

{

    lcdport=cmdout;        //Send command to lcdport=PORTB

    rs=0;                        

    rw=0;

    en=1;

    Delay_ms(10);

    en=0;

}

 

 

void lcddata(unsigned char dataout)

{

    lcdport=dataout;    //Send data to lcdport=PORTB

    rs=1;

    rw=0;

    en=1;

    Delay_ms(10);

    en=0;

}

 

[AJISH ALFRED]

Hi,

 

ADCON0|=(1 << GO);                              // Start A/D 

 

The value of ‘GO’ need to be defined with a value, like

 

#define GO 5

 

Learn about the ADCON0 to find out the value that should be used to define  the ‘GO’

[Ashutosh Bhatt]

you are using GO symbol many times. but actually it must be defined first. or else just give its value at every point like 0 or 1 or 5 etc

[Author]

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