The program for LEDs 8x8 doesn't function in Arduino Uno. I'm not using the pinMode() method. I'm using the other method for specification

Question

The program for LEDs 8x8 doesn't function in Arduino Uno. I'm not using the pinMode() method to specify pin OUTPUT for LEDs. I'm using the method "LedControl"

The specification pin:

"lc=LedControl(4,6,5,1);" 

for setting the pin. Why ?

1. This program compiles and executes without problems.

2. I'm importing the library correctly.

3. I'm using this example:

#include "LedControl.h"
/*Now we need a LedControl to work with.
pin 4 is connected to the DataIn
pin 5 is connected to the CLK
pin 6 is connected to LOAD / CS
We only have a single MAX7219 */
LedControl lc=LedControl(4,6,5,1);
/* we always wait a bit between updates of the display */
unsigned long delaytime=500;
void setup() {
  /* The MAX72XX is in power-saving mode on startup,
  we have to do a wakeup call */
  lc.shutdown(0,false);
  lc.setIntensity(0,8);
  lc.clearDisplay(0);
}
void loop() {
  lc.setIntensity(0,8);
  single();
  lc.clearDisplay(0);
}
        
/* This function will light up every Led on the matrix. The led will blink along with the row-number. row number 4 (index==3) will blink 4 times etc. */
void single() {
  for(int row=0;row<8;row++) {
    for(int col=0;col<8;col++) {
      delay(50);
      lc.setLed(0,row,col,true);
      delay(50);
      for(int i=0;i<col;i++) {
        lc.setLed(0,row,col,false);
        delay(50);
        lc.setLed(0,row,col,true);
        delay(50);
      }
    }
  }
}

Answer 1

The LedControl library uses pinMode in the background to make the LEDs easier to control. When you give values to LedControl, it automatically uses pinMode, which operates as pinMode(pin, OUTPUT|INPUT).