[SOLVED] Bipolar stepper motor drive

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kanni1303

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I am using 293d for bipolar stepper motor drive and it is not working why i dont know... the coding i used is
Code: 
PORTB=0x05;
DelayMs(50);
PORTB=0x09;
DelayMs(50);
PORTB=0x0A;
DelayMs(50);
PORTB=0x06;
DelayMs(50);
i tried by changing delay but no use...
i found the winding and formulated as per the winding but still not wrkng... it steps for few steps and stops there but not rotating i dont know what is the mistake...
 

And this is the diagram i used... i dont know what is the reason behind the problem... but it is not rotating... but i hear the sound in the motor... supply i used is 12V battery with 7812 regulator and for Microcontroller 9V battery... and my code is...
Code: 
#include<htc.h>
int _XTAL_FREQ=12000000;

int i;
void forv();
void rev();
void reva();
void fora();

void DelayMs(unsigned char delay)
{
unsigned int j;
for(i=0;i<=delay;i++)
{
for(j=0;j<=1000;j++);
}
}

void port_initialize()
{
TRISB=0X00;
PORTB=0x00;
TRISC=0xFF;

#define a RC0
#define b RC1
#define c RC2
#define d RC3

}

void main()

{
port_initialize();
while(1)
{
 if(a>0x00)
 { 
  forv();
 }
 if(b>0x00)
 {
  rev();
 }
 if(c>0x00)
 {
  reva();
 }
 if(d>0x00)
 {
  hfora();
 }
}
}

void forv()
{
PORTB=0x05;
DelayMs(50);
PORTB=0x09;
DelayMs(50);
PORTB=0x0A;
DelayMs(50);
PORTB=0x06;
DelayMs(50);
}

void rev()
{

PORTB=0x08;
DelayMs(100);
PORTB=0x09;
DelayMs(100);
PORTB=0x01;
DelayMs(100);
PORTB=0x03;
DelayMs(100);
PORTB=0x02;
DelayMs(100);
PORTB=0x06;
DelayMs(100);
PORTB=0x04;
DelayMs(100);
PORTB=0x0C;
DelayMs(100);
}
void reva()
{
PORTB=0x05;
DelayMs(150);
PORTB=0x09;
DelayMs(150);
PORTB=0x0A;
DelayMs(150);
PORTB=0x06;
DelayMs(150);
}
void fora()
{
PORTB=0x05;
DelayMs(200);
PORTB=0x09;
DelayMs(200);
PORTB=0x0A;
DelayMs(200);
PORTB=0x06;
DelayMs(200);
}

i am first trying to rotate in forward direction for that i used different delay and made this... my motor winding are Yellow Orange Brown and Black among which Yellow and Orange are one winding and Black and Brown are another winding.. pls help me...
 

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