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#define HCS301_TE    400
#define HCS301_BITS  66

typedef struct {
  uint32_t SerialNum;
  uint32_t Encrypted;
  uint8_t Btn1   :1;
  uint8_t Btn2   :1;
  uint8_t Btn3   :1;
  uint8_t Btn4   :1;
  uint8_t BatLow :1;
  uint8_t Repeat :1;
} hcs301_t;

void hcs301_msg(hcs301_t *msg, uint8_t *a) {
  msg->SerialNum = ((uint32_t)(a[7] & 0xf) << 24) | ((uint32_t)a[6] << 16) |
                   ((uint32_t)a[4] <<  8) | a[5];
  msg->Encrypted = ((uint32_t)a[0] << 24) | ((uint32_t)a[1] << 16) |
                   ((uint32_t)a[2] <<  8) | a[3];
  msg->Btn1 = (a[7] >> 5) & 1;
  msg->Btn2 = (a[7] >> 6) & 1;
  msg->Btn3 = (a[7] >> 7) & 1;
  msg->Btn4 = (a[7] >> 4) & 1;
  msg->BatLow = (a[8] >> 6) & 1;
  msg->Repeat = (a[8] >> 7) & 1;
}

#define RF_RECV_PIN       2
#define is_roughly(d,t)   ((d) > (t)-(t)/4 && (d) < (t)+(t)/4)
#define RF_TE             HCS301_TE
#define RF_BITS           HCS301_BITS
uint32_t                  RF_last_change = 0;
uint8_t                   RF_byte, RF_array[(RF_BITS+7)>>3];
uint8_t                   RF_mode = 0;
volatile boolean          RF_catched = false;

void RF_interrupt() {
  if (RF_catched)
    return;

  uint32_t duration = micros() - RF_last_change;
  uint8_t  pin = digitalRead(RF_RECV_PIN);
  RF_last_change += duration;

  if (!(RF_mode & 0x80)) {
    if (RF_mode > 20 && pin == HIGH && is_roughly(duration, 10*RF_TE))
      RF_mode = 0x80;
    else if (!is_roughly(duration, RF_TE))
      RF_mode = 0;
    else if (!(RF_mode & 0x40))
      RF_mode++;
  } else {
    uint8_t bit = 0;
    if (is_roughly(duration, RF_TE))
      bit = 0x80;
    else if (!is_roughly(duration, 2*RF_TE))
      RF_mode = 0;
    if (RF_mode) {
      if (pin == HIGH) {
        if ((bit ^= RF_byte) & 0x80)
          RF_mode++;
        else
          RF_mode = 0;
        RF_byte >>= 1;
      } else {
        RF_byte |= bit;
        RF_array[(RF_mode >> 3) & 0xf] = RF_byte;
        if (RF_mode >= 0x80 + RF_BITS - 1) {
          RF_catched = true;
          RF_mode = 0;
        }
      }
    }
  }
}

void setup() {
  Serial.begin(9600);
  attachInterrupt(digitalPinToInterrupt(RF_RECV_PIN), RF_interrupt, CHANGE);
  Serial.println("Listening RF");
}

void loop() {
  if (RF_catched) {
    hcs301_t msg;
    hcs301_msg(&msg, RF_array);
    RF_catched = false;
    Serial.print("#");
    Serial.print(msg.SerialNum, HEX);
    Serial.print(" ");
    Serial.print(msg.Encrypted, HEX);
    Serial.print(" ");
    if (msg.Btn1) Serial.print("1");
    if (msg.Btn2) Serial.print("2");
    if (msg.Btn3) Serial.print("3");
    if (msg.Btn4) Serial.print("4");
    if (msg.BatLow) Serial.print(" BatLow");
    if (msg.Repeat) Serial.print(" R");
    Serial.println();
  }
}