Tiny AVR Programmer "CHUU"

void monitormode() {
   SoftwareSerial monit(12, 13); // softUART pin setup for LCD   12:Rx 13:Tx
   monit.begin(9600);            // Rx:12
   Serial.begin(9600);
   digitalWrite(LED_ERR, HIGH);
   Serial.println("Serial Monitor Ready");
   delay(2500);
   while (digitalRead(4) == 1) {
      if (monit.available())
      Serial.write(monit.read());
      if (Serial.available())
      monit.write(Serial.read());
   }
   Serial.println("Upload Ready");
   Serial.println("After Upload Please Reset");
   digitalWrite(LED_ERR, LOW);
   delay(2500);
   Serial.begin(19200);
}
void loop(void) {
  if(digitalRead(4) == 0) { monitormode(); } // check sw
  
  // is pmode active?
  if (pmode) digitalWrite(LED_PMODE, HIGH); 
  else digitalWrite(LED_PMODE, LOW);
  // is there an error?
  if (error) digitalWrite(LED_ERR, HIGH); 
  else digitalWrite(LED_ERR, LOW);

  // light the heartbeat LED
  heartbeat();
  if (Serial.available()) {
    avrisp();
  }
}