PIC16F877A - Problem regarding motordriver~

[husni]

Hi there,
Ive been confused on the connection of my motordriver, which i'm not sure the code given is appropriate for my motor driver to work.

1st, I will list down the pin configuration

Motor driver leg >> PIC leg

2[D1] >> 18[RC3]
7[D2] >> 20[RD1]

1[RC2/CCP1] >> 17
10[D3] >> 22[RD3]
15[D4] >> 27[RD4]
9[RC1/CCP2] >> 16

and the code used is:

/*
 * Project name:
     PWM_Motor
 * Description:
     This project drives motors with speed control (0-255) using PWM.
     It required L293B as the motor driver.
 * Configuration:
     RD1 connects to IN1 (LMotor)
     RD2 connects to IN2 (LMotor)
     RD3 connects to IN3 (RMotor)
     RD4 connects to IN4 (RMotor)
     RC2/CCP1 connects to EN1 (LMotor)
     RC1/CCP2 connects to EN2 (RMotor)
     OUT1 connects to LMotor
     OUT2 connects to LMotor
     OUT3 connects to RMotor
     OUT4 connects to RMotor
*/

void initialize(void);
void lmotorforward(unsigned char);
void lmotorbackward(unsigned char);
void lmotorstop(void);
void rmotorforward(unsigned char);
void rmotorbackward(unsigned char);
void rmotorstop(void);

void main() {
  initialize();		// Call initialization function
  PWM_Start();		// Start PWM for CCP1
  CCP2CON = 0x3C;	// Start PWM for CCP2

  while(1) {			// Loop forever
    lmotorforward(255);		// LMotor forward with 255 speed
    rmotorforward(255);		// RMotor forward with 255 speed
    Delay_ms(2000);		// Delay for 2s

    lmotorstop();		// LMotor stop
    rmotorstop();		// RMotor stop
    Delay_ms(2000);		// Delay for 2s

    lmotorbackward(150);	// LMotor backward with 255 speed
    rmotorbackward(150);	// RMotor backward with 255 speed
    Delay_ms(2000);		// Delay for 2s

    lmotorstop();		// LMotor stop
    rmotorstop();		// RMotor stop
    Delay_ms(2000);		// Delay for 2s
  }

}

void initialize() {	// Initialization function
  PORTD = 0;		// Set PORTD to low
  TRISD = 0;		// Set PORTD as output
  TRISC = 0;            // Set PORTC as output
  PWM_Init(5000);	// Initialize PWM module with 5k frequency
  CCP2CON = 0x30;
}

void lmotorforward(unsigned char speed) {	// LMotor Forward function
  Pwm_Change_Duty(speed);			// Set motor speed
  PORTC.F3=1;					// Control IN1
  PORTD.F1=0;					// Control IN2
}

void lmotorbackward(unsigned char speed) {	// LMotor Backward function
  Pwm_Change_Duty(speed);				// Set motor speed
  PORTC.F3=0;					// Control IN1
  PORTD.F1=1;					// Control IN2
}

void lmotorstop() {	// LMotor Stop function
  PORTC.F3=0;		// Control IN1
  PORTD.F1=0;		// Control IN2
}

void rmotorforward(unsigned char speed) {	// RMotor Forward function
  CCPR2L = speed;				// Set motor speed
  PORTD.F3=1;    				// Control IN3
  PORTD.F4=0;      				// Control IN4
}

void rmotorbackward(unsigned char speed) {	// RMotor Backward function
  CCPR2L = speed;				// Set motor speed
  PORTD.F3=0;					// Control IN3
  PORTD.F4=1;      				// Control IN4
}

void rmotorstop() {	// RMotor Stop function
  PORTD.F3=0;    	// Control IN3
  PORTD.F4=0;		// Control IN4
}

So, did u guys spot any problem there? Seems that my motor didn't responce at all.

 

[wmmullaney]

I don't know much C but it looks ok, are you connecting the motor to the pic directly? If so you could have fried it, always use a transistor.

Also, welcome to Electro-Tech!

 

[wmmullaney]

Wait, that is C right?

 

[husni]

yes i think


btw, the motor is connected to pic via motor driver.


PIC >> Motor driver >> Motor

 

[wmmullaney]

You might try an emulator, to see if the code is working.