Porting Arduino code to AVR/C++ input not working?

Question

So. I'm trying to read an input on the Arduino Nano using C++/AVR/Eclipse instead of the regular arduino IDE. The code below is working in the arduino IDE

void setup() {
 // put your setup code here, to run once:
 pinMode(13, OUTPUT);
 pinMode(5, INPUT);
}
void loop() {
 // put your main code here, to run repeatedly:
 if(digitalRead(5)){
 digitalWrite(13,1);
 }else{
 digitalWrite(13,0);
 }
}

I'm porting the code to AVR/C++ in Eclipse, regular blinking leds is working... but I can't read inputs for some reason...

#define F_CPU 16000000UL //16MHz
#include <avr/io.h>
#include <util/delay.h>
#define set_bit(Y,bit_x) (Y|=(1<<bit_x))
#define clear_bit(Y,bit_x) (Y&=~(1<<bit_x))
#define isset_bit(Y,bit_x) (Y&(1<<bit_x))
#define toggle_bit(Y,bit_x) (Y^=(1<<bit_x))
int main( ){
 DDRB = 0xFF;//Setting all portB pins to output (D13/PB5 - LED)
 DDRD = 0x00;//Setting all portD pins to input (D5 /PD5 - INPUT)
 while(1){
 if(isset_bit(PORTD,PD5)){//if input... doesn't work?
 set_bit(PORTB,PB5);//Set output (Tested to be working)
 }else{
 clear_bit(PORTB,PB5);//Clear output
 }
 }
}

• Ignacio Vazquez-Abrams: Use the checkmark next to the answer rather than changing the title to indicate that the question has been answered.

Answer 1

During the creation of this question I found out the answer... Though I wanted to share it with you guys for later reference. It has been quite a time since I have worked with AVR.

You should read pins from PINx

You should set pins in PORTx

Set DDRx to 1 for OUTPUT and to 0 for INPUT

^ This is fun because PIC/Microchip MCU's use 1 for input and 0 for output.

See code below:

#define F_CPU 16000000UL
#include <avr/io.h>
#include <util/delay.h>
#define set_bit(Y,bit_x) (Y|=(1<<bit_x))
#define clear_bit(Y,bit_x) (Y&=~(1<<bit_x))
#define isset_bit(Y,bit_x) (Y&(1<<bit_x))
#define toggle_bit(Y,bit_x) (Y^=(1<<bit_x))
int main( ){
 DDRB = 0xFF;
 DDRD = 0x00;
 while(1){
 if((PIND&(1<<PD5))){
 set_bit(PORTB,PB5);
 }else{
 clear_bit(PORTB,PB5);
 }
 }
}

• user2497: This is interesting, what pins are you reading and writing? And how would you take an analog reading?
• aaa: @user2497 The microcontrollers use registers that you can read/write to/from. Arduino is an environment and a wrapper around this, to make it easier and more understandable. You should check the datasheet, to find which registers hold what. The registers are 1 byte (I bits), so you'll have to do some bit manipulation/arethmic and write it to the correct registers.