Why is this code not working?

Question

So I am trying to use Port Manipulation to turn on LEDS but I need to use PORT Manipulations for specific reasons.

//22-29PORTA (0x01-0x80)
//30-37PORTC (0x80-0x01)
//38-45PORTD (0x80-0x01)
void setup(){
PORTA = B0000000; //29--->22
PORTC = B0000000; //37--->30
PORTD = B0000000; //45--->38
}
void loop(){
 PORTA = B1000100;
 PORTC = B0101000;
 PORTD = B0000010;
 delay(1000);
 PORTA = B1010000;
 PORTC = B0001010;
 PORTD = B0100000;
 delay(1000);
 PORTA = B0010100;
 PORTC = B0100010;
 PORTD = B0001000;
 delay(1000); 
}```
Heres the code for Arduino Mega 2560

Answer 1

You need to set the ports to output first, before you can use them.

To do that you use the DDRx (Data Direction) registers. Your code should look like:

//22-29PORTA (0x01-0x80)
//30-37PORTC (0x80-0x01)
//38-45PORTD (0x80-0x01)
void setup(){
 // Set the pins all to output
 DDRA = 0xFF;
 DDRC = 0xFF;
 DDRD = 0xFF;
 PORTA = B0000000; //29--->22
 PORTC = B0000000; //37--->30
 PORTD = B0000000; //45--->38
}
void loop(){
 PORTA = B1000100;
 PORTC = B0101000;
 PORTD = B0000010;
 delay(1000);
 PORTA = B1010000;
 PORTC = B0001010;
 PORTD = B0100000;
 delay(1000);
 PORTA = B0010100;
 PORTC = B0100010;
 PORTD = B0001000;
 delay(1000); 
}

You can read more about direct port manipulation here.