/* Program to contron LEDs using push-button switches on Wytec EduBase/EduPad board 
 * with Tiva TM4C123/MSP432.
 * The LEDs are connected to pins 3, 4, 19, 38 and the push-button switches are
 * connected to pins 23, 24, 25, 26.
 * DIP switches should be at off position because they share the same pins as
 * the push-button switches.
 * 
 * Energia 1.6.10E18
 */

/* Tiva TM4C123 */ //const int LED[] = {PB_0, PB_1, PB_2, PB_3};
const int LED[] = {3, 4, 19, 38};
/* Tiva TM4C123 */ //const int SW[] = {PD_0, PD_1, PD_2, PD_3};
const int SW[] = {23, 24, 25, 26};

void setup()
{
  // configure input output pins for switches and LEDs
  for (int i = 0; i < 4; i++)
  {
    pinMode(LED[i], OUTPUT);
    pinMode(SW[i], INPUT);
  }
}

void loop()
{
    // read switches and use the values to set LEDs
    digitalGroupWrite(LED, 4, digitalGroupRead(SW, 4));
}

// write to a group of output pins
void digitalGroupWrite(const int* group, int length, int data)
{
    for (int i = 0; i < length; i++)
        digitalWrite(group[i], data & (1 << i) ? HIGH : LOW);
}

// read from a group of input pins
int digitalGroupRead(const int* group, int length)
{
    int data = 0%3b.html
    
    for (int i = 0; i < length; i++)
    {
        data <<= 1;
        data |= digitalRead(group[i]) ? 1 : 0;
    }
    return data;
}