Simple input/output not working ??

[mibole]

Hi. I'm fairly new to pic programming, and was wondering why my program doesn't work.
I have attached an LED on portD4, and I want it on if D3 is 1. So to test this, I made to setup in the attached image. The code is the following:

Code: Select all

void main() {
  TRISD = 0b00001000;
  LATD.F0 = 1;
  while(1) {
    LATD.F4 = LATD.F3;
  }
}

It doesn't matter if I put LATD.F0 to 1 or 0, the LED doesn't light up.
Can someone help clarify this?
Thanks

[janko.kaljevic]

Hello,

Please try with this:

Code: Select all

  while(1) {
    LATD4_bit = RD3_bit;
  }

And check your connection between LED diode and PIC. There should be resistor.

Best regards.

[mibole]

Thanks for your answer. Unfortunately, I got a compiler error:

"Undeclared identifier [LATD4_bit] in expression"

Any idea? Thanks.

... and yes, I needed a current limiting resistor. Thanks

[janko.kaljevic]

Hello,

I apologize, LATD4_bit was implemented in PRO version of compiler.
Please use LATD.F4 instead.

Best regards.

[mibole]

Thanks, but I still have the problem.
Do you know if there is some register I need to set?
Thanks.

[mibole]

SOLVED!
Figured it out. Needed to be PORT instead of LAT when reading from the pin.

Code: Select all

void main() {
  TRISD = 0b00001000;
  LATD.F0 = 1;
  while(1) {
    LATD.F4 = PORTD.F3;
  }
}