nodemcu famiclone lpr

nodelpr.ino

/*
nodemcu line printer for Subor Famiclones
                                   - morb
*/

const int pins[] = { 16, 5, 4, 0, 2, 14, 12, 13, 15 };
const int busy = 3;
byte out;

void ICACHE_RAM_ATTR readStrobe() {
  for (int i=0;i<8;i++) {
  bitWrite (out, i, (digitalRead(pins[i])));
  }
  Serial.print((char)out);
  digitalWrite(busy, HIGH);
  delay(33);
  digitalWrite(busy, LOW);
}


void setup() {
  Serial.begin(115200);
  pinMode(busy, OUTPUT);
    for (int i=0;i<9;i++) {
      pinMode(pins[i], INPUT_PULLUP);
  }  
  attachInterrupt(15,readStrobe,CHANGE);
}

void loop() {
}