How to deal with Enums...

Projects Programming
1

Hello Community!
Question about Enum - I decoding my HomeAlarm using a NodeMCU and want to sent the status to my Homey for home automation

It's required to send HomeAlarmState defined as Enum with the structure below, which I have defined globally before void setup()

enum HomeAlarmState {
armed ,
disarmed,
partially_armed
};
But now I need your help

  1. How to set the values on each individual parameter. I have tried with e.g. armed = 1; but I got a compile error

DSCPanel_NodeMCU_Homey:327: error: lvalue required as left operand of assignment

disarmed = 1;

  1. How do I print the Enum?
    have tried with Serial.println(HomeAlarmState) without success.

  2. How to set the Enum HomeAlarmState to the Homey.setCapabilityValue("homealarm_state", HomeAlarmState); function. I get a compile errror as

DSCPanel_NodeMCU_Homey:366: error: expected primary-expression before ')' token

Homey.setCapabilityValue("homealarm_state", HomeAlarmState);

2

An example

enum
{
  armed ,
  disarmed,
  partially_armed
} currentState;


void setup()
{
  Serial.begin(115200);
  currentState = armed;
  Serial.println(currentState);
  currentState = disarmed;
  Serial.println(currentState);
  currentState = partially_armed;
  Serial.println(currentState);
}

void loop()
{
}

How do I print the complete Enum?

You can't. By definition an enum only has a singe value at any time.

How to set the Enum HomeAlarmState to

See the example above which sets the current state of the enum.

3

Magnus_P:
enum HomeAlarmState {
armed ,
disarmed,
partially_armed
};

  1. How do I print the Enum?
    have tried with Serial.println(HomeAlarmState) without success.

If you have some (PROG) memory to spare a function can print the values in human readable form

void printHomeAlarmState(HomeAlarmState state)   // or printHAS(..)
{
  switch(state)
  {
  case armed: 
    Serial.print(F("fully armed")); 
    break;  
  case disarmed: 
    Serial.printF(("not armed")); 
    break;
  case partially_armed: 
    Serial.print(F("partial armed"));
    break;
  default:
    Serial.print(F("unknown state"));
    break;
  }
}

The latter is needed if you extend your enum and forget to update the printHAS() code....

4

An enum is not a variable but a type. So you need to create a variable of that type.

UKHeliBob did it like below

enum
{
  armed ,
  disarmed,
  partially_armed
} currentState;

I use

enum ALARMSTATE
{
  armed ,
  disarmed,
  partially_armed
};

ALARMSTATE currentState = disarmed;  // just as an example