#include <LedControl.h>

LedControl lc = LedControl(7, 6, 10, 4); 
void setup() {
  for (int i = 0; i < 4; i++) {
    lc.shutdown(i, false);     
    lc.setIntensity(i, 8);      
    lc.clearDisplay(i);         
    
    for (int col = 0; col < 8; col++) {
      lc.setColumn(i, col, 0xFF); 
    }
  }
}

void loop() {
  
}