// Sketch for testing switch between loops for LED patterns v4 (remembers mode state)

const byte PinLed    = 9;
const byte PinSwitch = 2;

int ledState;

unsigned long M1InitOnTime  = 500;
unsigned long M1OnIncrement = 500;
unsigned long M1OnTimeMax   = 3000 - M1OnIncrement;

unsigned long M2InitOnTime  = 1000;
unsigned long M2OnIncrement = 1000;
unsigned long M2OnTimeMax   = 5000 - M2OnIncrement;

const unsigned long MsecLedOff = 3;

unsigned long msecPeriod;
unsigned long msecLst;
unsigned long msec;

unsigned long msecPeriodMin;
unsigned long msecPeriodMax;
unsigned long msecPeriodInc;

enum { On = HIGH, Off = LOW };

// -----------------------------------------------------------------------------
void loop ()
{
    if (LOW == digitalRead(PinSwitch))  {
        msecPeriodMin = M1InitOnTime;
        msecPeriodMax = M1OnTimeMax;
        msecPeriodInc = M1OnIncrement;
    }
    else {
        msecPeriodMin = M2InitOnTime;
        msecPeriodMax = M2OnTimeMax;
        msecPeriodInc = M2OnIncrement;
    }
    msec = millis ();
    if (msec - msecLst >= msecPeriod)  {
        msecLst = msec;
        if (ledState == On) {
            ledState   = Off;
            msecPeriod = MsecLedOff;
        }
        else {
            ledState = On;
            msecPeriod += msecPeriodInc;
            if (msecPeriodMax <= msecPeriod)
                msecPeriod = msecPeriodMin;
        }
        Serial.println (msecPeriod);
        digitalWrite (PinLed, ledState);
    }
}

// -----------------------------------------------------------------------------
void setup ()
{
    pinMode (PinLed, OUTPUT);
    pinMode (PinSwitch, INPUT_PULLUP);

    Serial.begin (9600);
}