DC Motor interfacing with Microcontrollers tutorial: Programming Microcontroller
►Assembly programmingCODE:
L293D_A equ P2.0 ;L293D A - Positive of Motor
L293D_B equ P2.1 ;L293D B - Negative of Motor
L293D_E equ P2.2 ;L293D E - Enable pin of IC
org 0H
Main:
acall rotate_f ;Rotate motor forward
acall delay ;Let the motor rotate
acall break ;Stop the motor
acall delay ;Wait for some time
acall rotate_b ;Rotate motor backward
acall delay ;Let the motor rotate
acall break ;Stop the motor
acall delay ;Wait for some time
sjmp Main ;Do this in loop
rotate_f:
setb L293D_A ;Make Positive of motor 1
clr L293D_B ;Make negative of motor 0
setb L293D_E ;Enable to run the motor
ret ;Return from routine
rotate_b:
clr L293D_A ;Make positive of motor 0
setb L293D_B ;Make negative of motor 1
setb L293D_E ;Enable to run the motor
ret ;Return from routine
break:
clr L293D_A ;Make Positive of motor 0
clr L293D_B ;Make negative of motor 0
clr L293D_E ;Disable the o/p
ret ;Return from routine
delay: ;Some Delay
mov r7,#20H
back: mov r6,#FFH
back1: mov r5,#FFH
here: djnz r5, here
djnz r6, back1
djnz r7, back
ret
CODE:
#include <AT89X51.H>#define L293D_A P2_0 //Positive of motor
#define L293D_B P2_1 //Negative of motor
#define L293D_E P2_2 //Enable of L293D
// Function Prototypes
void rotate_f(void); //Forward run funtion
void rotate_b(void); //Backward run function
void breaks(void); //Motor stop function
void delay(void); //Some delay
void main(){ //Our main function
while(1){ //Infinite loop
rotate_f(); //Run forward
delay(); //Some delay
breaks(); //Stop
delay(); //Some delay
rotate_b(); //Run Backwards
delay(); //Some delay
breaks(); //Stop
delay(); //Some delay
} //Do this infinitely
}
void rotate_f(){
L293D_A = 1; //Make positive of motor 1
L293D_B = 0; //Make negative of motor 0
L293D_E = 1; //Enable L293D
}
void rotate_b(){
L293D_A = 0; //Make positive of motor 0
L293D_B = 1; //Make negative of motor 1
L293D_E = 1; //Enable L293D
}
void breaks(){
L293D_A = 0; //Make positive of motor 0
L293D_B = 0; //Make negative of motor 0
L293D_E = 0; //Disable L293D
}
void delay(){ //Some delay...
unsigned char i,j,k;
for(i=0;i<0x20;i++)
for(j=0;j<255;j++)
for(k=0;k<255;k++);
}
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