PIC16F877A How to enable PORT RB1, RB2, RB3, RB4

[sajay]

Dear Guys,
I got below code on other forum, my question is how to enable PORTB RB1, RB2, RB3, RB4, below code only enable for PORTB RB0 (if (INTCON.INTF) ).

I mean is when RB1 toggle then PORTC & PORTD ON, one more toggle PORTC & PORTD OFF.

int cnt = 127;          

void main() {

TRISB = 0xFF;
TRISC = 0X00;
PORTC = 0x00;
TRISD=0x00;
PORTD=0x40;

ADCON1 = 0x7F;          // all pins digital

0xD0;          // gie i int enabled
OPTION_REG = 0x00;

PWM1_Init(5000);         // pwm freq = 5000hz
PWM1_Set_Duty(cnt);
PWM1_Start();

while (1)
  {

  }
}

void interrupt (void)
{
if (INTCON.INTF)
{
  //motor changes direction on each interrupt:
  PORTD.f7=~PORTD.f7;             // D.f7=1 (motor turns clockwise);

  PORTD.f0=~PORTD.f0;             // LED on D.f1 changes state on each interrupt
  INTCON.INTF = 0;                // reset int flag
}

if (INTCON.INTF)
{
  //motor changes direction on each interrupt:
  PORTD.f6=~PORTD.f6;             // D.f7=1 (motor turns clockwise);

  PORTD.f1=~PORTD.f1;             // LED on D.f1 changes state on each interrupt
  INTCON.INTF = 0;                // reset int flag

}
}

 

[KlausST]

Hi,

use TRISB to change INPUT/OUTPUT = portB direction.
use PORTB to set/clear (high/low, 1/0) PORT B bits.

both are 8 bit registers for 8 bits = 8 data lines of port B.

Read datasheet on this.

Klaus

 

[msmiha]

Because of an example I'm assuming you try to write code in MikroC

If you want to define PORTB pins RB1, RB2, RB3, RB4 as outputs write this:

void main()
{
  while(1) {
    //define RB1, RB2, RB3, RB4 as outputs
    TRISB.B1 = 0;
    TRISB.B2 = 0;
    TRISB.B3 = 0;
    TRISB.B4 = 0;

    //Turn on Output:
    PORTB.B1 = 1;
    PORTB.B2 = 1;
    PORTB.B3 = 1;
    PORTB.B4 = 1;

    delay_ms(1000);  //paus for 1sec
    
   //Turn off Output:
    PORTB.B1 = 0;
    PORTB.B2 = 0;
    PORTB.B3 = 0;
    PORTB.B4 = 0;
}

If you want to define PORTB pins RB1, RB2, RB3, RB4 as inputs write this:

void main()
{
  while(1) {

    //define RB1, RB2, RB3, RB4 as inputs
    TRISB.B1 = 1;
    TRISB.B2 = 1;
    TRISB.B3 = 1;
    TRISB.B4 = 1;
    //define RB0 as output
    TRISB.B0 = 0;
    
   //Turn on Output RB0 if one of inputs RB1, RB2, RB3, RB4 = 1;
    if(PORTB.B1 == 1) {
       PORTB.B0 = 1;
    }
    else if (PORTB.B2 == 1) {
       PORTB.B0 = 1;
    }
    else if (PORTB.B3 == 1) {
       PORTB.B0 = 1;
    }
    else if (PORTB.B4 == 1) {
       PORTB.B0 = 1;
    }
    else {
       PORTB.B0 = 0;  //Turn off RB0 if non of RB1, RB2, RB3, RB4  are pressed
    }
  }
}