#define BUTTON 7
#define LED 12

void setup() {

  pinMode(BUTTON, INPUT_PULLUP);
  pinMode(LED, OUTPUT);

  digitalWrite(LED, LOW);
}

void loop() {
  static unsigned long int prev_read = 0;
  static unsigned long int prev_write = 0;
  static int toggle_time = 1000;
  static int state = LOW;

  if (millis() - prev_read > 100) {
    toggle_time = (digitalRead(BUTTON) == HIGH) ? 200 : 1000;
    prev_read = millis();
  }

  if (millis() - prev_write > toggle_time)
  {
    digitalWrite(LED, state = !state);
    prev_write = millis();
  }

}