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Old 29th March 2012, 06:37 PM   #1
diyAudio Member
Join Date: Oct 2011
Default PIC 16F877A C code problem

hello every body,
I need help on my line follower robot based on PIC 16f877A. i download C source code and try to Hi Tech compiler to compile this code in MPLAB. but it show missing error in first 6 line. but i can't find any problem those line. i give the code without header file. plz any body find the error or convert it HEX format.
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#include <16F877A.h>; //declare a PIC header
#include <stdlib.h>
//#include <pic.h>
#include <delay.h>
#device adc=8; //set the bit for ADC
#fuses hs, nowdt, noprotect; //set the PIC protection
#use delay (clock=20000000); //set the clock frequency
int val1; //ADC value 1 left sensor
int val2; //ADC value 2 center sensor
int val3; //ADC value 3 right sensor
int vref; //voltage reference
void lmotor(int gear); //left motor function
void rmotor(int gear); //right motor function
#byte PORTA=5; //assign port a
#byte PORTD=8; //assign port d

void main() //main function
vref=0x7f; //set voltage reference value
set_tris_d(0); //declare port d as output
setup_port_a(ALL_ANALOG); //enable port a as ADC port
setup_adc(ADC_CLOCK_INTERNAL); //set the clock for ADC
setup_ccp1(CCP_PWM); //set enable ccp1
setup_ccp2(CCP_PWM); //set enable ccp2
setup_timer_2(T2_DIV_BY_4,100,1); //set post scaler timer

while(1) //inifinite loop
PORTD=0xaa; //set value for motor
set_adc_channel(0); //ADC at port A0 channel
val1=read_adc(); //read and store A0 value
set_adc_channel(2); //ADC at port A2 channel
val2=read_adc(); //read and store A2 value
set_adc_channel(4); //Adc at port A4
val3=read_adc(); //read and store A4 value

//start condition
//if sensor sense dark then value is greater than Vref
//if sensor sense bright then value is lower than Vref
if(val2>vref) //if sensor 2 is dark
if((val1<vref)&&(val3<vref)) //sensor 1&3 is bright
{ //send value to motor ccp
lmotor(70); //both motor moving at same rate
else if (val1>vref) //sensor 1 is dark
lmotor(0); //left motor stop
rmotor(70); //right motor move
else if (val3>vref) //sensor 3 is dark
lmotor(70); //left motor move
rmotor(0); //right motor stop
else if ((val1>vref)&&(val3<vref)) //if only sensor 1 is dark
lmotor(0); //left motor stop
rmotor(70); //right motor move

else if ((val3>vref)&&(val1<vref)) //if only sensor 3 is dark
lmotor(70); //left motor move
rmotor(0); //right motor stop
else //other than condition above
lmotor(60); //left motor move slow
rmotor(60); //right motor move slow

//end program
void lmotor(int gear) //left motor ccp control function
set_pwm1_duty(gear); //ccp1 duty cycle


void rmotor(int gear) //right motor ccp control function
set_pwm2_duty(gear); //ccp2 duty cycle


It is very very emargency in my study.

Plz help me very queckly.

Thanks to all


Last edited by mirrayhan08; 29th March 2012 at 06:48 PM. Reason: Change Something
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Old 6th April 2012, 12:02 AM   #2
Wolfsin is offline Wolfsin  United States
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Join Date: Aug 2009
Blog Entries: 2
#include <16F877A.h>; //declare a PIC header

; appears misplaced
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