Method interruptHandler

RFM69.cpp:428–464

internal function - interrupt gets called when a packet is received

// internal function - interrupt gets called when a packet is received
void RFM69::interruptHandler() {
  if (_mode == RF69_MODE_RX && (readReg(REG_IRQFLAGS2) & RF_IRQFLAGS2_PAYLOADREADY)) {
    setMode(RF69_MODE_STANDBY);
    select();
    _spi->transfer(REG_FIFO & 0x7F);
    PAYLOADLEN = _spi->transfer(0);
    PAYLOADLEN = PAYLOADLEN > 66 ? 66 : PAYLOADLEN; // precaution
    TARGETID = _spi->transfer(0);
    SENDERID = _spi->transfer(0);
    uint8_t CTLbyte = _spi->transfer(0);
    TARGETID |= (uint16_t(CTLbyte) & 0x0C) << 6; // 10 bit address (most significant 2 bits stored in bits(2,3) of CTL byte
    SENDERID |= (uint16_t(CTLbyte) & 0x03) << 8; // 10 bit address (most sifnigicant 2 bits stored in bits(0,1) of CTL byte

    if(!(_spyMode || TARGETID == _address || TARGETID == RF69_BROADCAST_ADDR) // match this node's address, or broadcast address or anything in spy mode
       || PAYLOADLEN < 3) // address situation could receive packets that are malformed and don't fit this libraries extra fields
    {
      PAYLOADLEN = 0;
      unselect();
      receiveBegin();
      return;
    }

    DATALEN = PAYLOADLEN - 3;
    ACK_RECEIVED = CTLbyte & RFM69_CTL_SENDACK; // extract ACK-received flag
    ACK_REQUESTED = CTLbyte & RFM69_CTL_REQACK; // extract ACK-requested flag
    uint8_t _pl = _powerLevel; // interruptHook() can change _powerLevel so remember it
    interruptHook(CTLbyte);    // TWS: hook to derived class interrupt function

    for (uint8_t i = 0; i < DATALEN; i++) DATA[i] = _spi->transfer(0);

    DATA[DATALEN] = 0; // add null at end of string // add null at end of string
    unselect();
    setMode(RF69_MODE_RX);
    if (_pl != _powerLevel) setPowerLevel(_powerLevel); // set new _powerLevel if changed
  }
  RSSI = readRSSI();
}

// internal function
ISR_PREFIX void RFM69::isr0() {