Protocol for avoiding pointers

[vvb333007]

@ehnmc

 switch (motor_id) {
    case 1:
      activeMotorID = 1;
      break;
    case 2:
      activeMotorID = 2;
      break;
    case 3:
      activeMotorID = 3;
      break;
    case 4:
      activeMotorID = 4;
      break;
  }

This can be simplified down to

  activeMotorID = motor_id;

or, better

if (motor_id < 5 && motor_id > 0)
  activeMotorID = motor_id;
else
  Serial.printf("Bad motor_id %d\r\n",motor_id);

The switch/case statement has hidden powers, but you don't use them

They are (assuming we are all using GCC-based compilers)

1. case ranges: e.g. case 1...10:
2. ability to fallthrough from one "case" to another
3. "default" statement