bool RH_RF24::send(const uint8_t* data, uint8_t len)
{
if (len > RH_RF24_MAX_MESSAGE_LEN)
return false;
waitPacketSent(); // Make sure we dont interrupt an outgoing message
setModeIdle(); // Prevent RX while filling the fifo
// Put the payload in the FIFO
// First the length in fixed length field 1. This wont appear in the receiver fifo since
// we have turned off IN_FIFO in PKT_LEN
_buf[0] = len + RH_RF24_HEADER_LEN;
// Now the rest of the payload in variable length field 2
// First the headers
_buf[1] = _txHeaderTo;
_buf[2] = _txHeaderFrom;
_buf[3] = _txHeaderId;
_buf[4] = _txHeaderFlags;
// Then the message
memcpy(_buf + 1 + RH_RF24_HEADER_LEN, data, len);
_bufLen = len + 1 + RH_RF24_HEADER_LEN;
_txBufSentIndex = 0;
// Set the field 2 length to the variable payload length
uint8_t l[] = { (uint8_t)(len + RH_RF24_HEADER_LEN)};
set_properties(RH_RF24_PROPERTY_PKT_FIELD_2_LENGTH_7_0, l, sizeof(l));
sendNextFragment();
setModeTx();
return true;
}
bool RH_RF95::send(const uint8_t* data, uint8_t len)
{
if (len > RH_RF95_MAX_MESSAGE_LEN)
return false;
waitPacketSent(); // Make sure we dont interrupt an outgoing message
setModeIdle();
if (!waitCAD())
return false; // Check channel activity
// Position at the beginning of the FIFO
spiWrite(RH_RF95_REG_0D_FIFO_ADDR_PTR, 0);
// The headers
spiWrite(RH_RF95_REG_00_FIFO, _txHeaderTo);
spiWrite(RH_RF95_REG_00_FIFO, _txHeaderFrom);
spiWrite(RH_RF95_REG_00_FIFO, _txHeaderId);
spiWrite(RH_RF95_REG_00_FIFO, _txHeaderFlags);
// The message data
spiBurstWrite(RH_RF95_REG_00_FIFO, data, len);
spiWrite(RH_RF95_REG_22_PAYLOAD_LENGTH, len + RH_RF95_HEADER_LEN);
setModeTx(); // Start the transmitter
// when Tx is done, interruptHandler will fire and radio mode will return to STANDBY
return true;
}
void RH_RF22::startTransmit()
{
sendNextFragment(); // Actually the first fragment
spiWrite(RH_RF22_REG_3E_PACKET_LENGTH, _bufLen); // Total length that will be sent
setModeTx(); // Start the transmitter, turns off the receiver
}
