Using Enumerations

Projects Programming
1

I would love to know if this is possible:

I have 3 settings: speed, direction, color

I'm trying to have 1 variable array, setting[2] to control these BUT have them identified by the user by name (speed, direction, color).

Something like this:

String input;
enum setting { speed, direction, color};

Serial.print("Which setting");
while (!Serial.available()); // sits and waits until a user input
input = Serial.readString();

switch ((int) input)
{
case 0:
// do the speed thing
break;

case 1:
// do the direction thing
break;

case 2:
// do the color thing
break;
default:
// not accepted input
break
}

I know this kind of thing is possible in C# but I don't know about C++ or Arduino.

Any help would be appreciated!

Dave

2

How would you do it in C#?

3

On C/C++ you can't refer to variables by name from user input.

You also can't cast a String to an int.

You can use a lookup table containing the parameter names as text. Find the name of the parameter that you want to set in the table and use its index in the switch statement.

4

Here is an example similar to what you want to do (as sterretje described), maybe it will help

5

arduino_new:
How would you do it in C#?

I think reflection is the word.

6

here's a function i typically put in all my programs to exercise code using commands from the Serial input. pcRead() is called from loop().

// process single character commands from the PC
void
pcRead (void)
{
    static long  val  = 0;
    static int   sign = 1;

    if (Serial.available()) {
        int c = Serial.read ();

        switch (c)  {
        case '0':
        case '1':
        case '2':
        case '3':
        case '4':
        case '5':
        case '6':
        case '7':
        case '8':
        case '9':
            val = c - '0' + (10 * val);
            Serial.println (val);
            break;

        case ' ':
            val  = 0;
            sign = 1;
            break;

        case '-':
            sign = -1;
            break;

        case 'B':
            dumpBuf();
            break;

        case 'D':
            debug = val;
            val   = 0;
            break;

        case 'd':
            status();
            break;

        case 'i':
            pins();
            break;

        case 'l':
            lead = val * sign;
            break;

        case 'm':
            manual ^= 1;
            break;

        case 'P':
            pos = target = 0;
            SetSpeed(0);
            break;

        case 'p':
            pins();
            break;

        case 'R':
            SetSpeed(M_MAX);
            break;

        case 'r':
            setDir(D_CW == h_dir ? D_CCW : D_CW);
            break;

        case 'S':
            SetSpeed(M_MAX < val * sign ? M_MAX : val * sign);
            val  = 0;
            sign = 1;
            break;

        case 's':
            SetSpeed(0);
            manual = 1;
            status();
            pos    = 0;
            maxPer = minPer = 0;
            break;

        case 't':
            manual = 0;
            target = val * sign;
            val    = 0;
            sign   = 1;

#if 0
            t_dir  = (target < pos ? D_CCW : D_CW);
            setDir   (t_dir);
#else
            setDir   (target < pos ? D_CCW : D_CW);
#endif
            SetSpeed (M_MAX);

            Serial.print   ("pcRead: ");
            Serial.print   (" target ");
            Serial.println (target);

            SetSpeed(M_MAX);

            isrCnt = maxPer = minPer = 0;
            break;

        case 'T':
            Serial.print   ("pcRead: ");
            Serial.print   (" usec ");
            Serial.println (micros());
            break;

        case 'v':
            Serial.println (VERSION);
            break;

            break;

        case '?':
            Serial.println ("   [0-9] 10*val + digit");
            Serial.println ("   sp    val = 0");
            Serial.println ("   -     sign = -1");
            Serial.println ("   B     dumpBuf()");
            Serial.println ("   D     toggle debug");
            Serial.println ("   d     status()");
            Serial.println ("   i     report state");
            Serial.println ("   l     set lead = val");
            Serial.println ("   m     toggle manual");
            Serial.println ("   P     set pos = 0");
            Serial.println ("   p     display pin values");
            Serial.println ("   R     run max speed");
            Serial.println ("   r     reverse");
            Serial.println ("   S     set speed (0-255)");
            Serial.println ("   s     stop");
            Serial.println ("   t     set target position = val");
            Serial.println ("   T     time (usec)");
            Serial.println ("   v     version");
            break;

        default:
            break;
        }
    }
}