LOCAL bool RF24_sendMessage(const uint8_t recipient, const void* buf, const uint8_t len)
{
uint8_t RF24_status;
RF24_stopListening();
RF24_openWritingPipe( recipient );
RF24_DEBUG(PSTR("RF24:SND:TO=%d,LEN=%d\n"),recipient,len); // send message
// flush TX FIFO
RF24_flushTX();
// this command is affected in clones (e.g. Si24R1): flipped NoACK bit when using W_TX_PAYLOAD_NO_ACK / W_TX_PAYLOAD
// AutoACK is disabled on the broadcasting pipe - NO_ACK prevents resending
RF24_spiMultiByteTransfer(recipient == BROADCAST_ADDRESS ? RF24_WRITE_TX_PAYLOAD_NO_ACK :
RF24_WRITE_TX_PAYLOAD, (uint8_t*)buf, len, false );
// go, TX starts after ~10us
RF24_ce(HIGH);
// timeout counter to detect HW issues
uint16_t timeout = 0xFFFF;
do {
RF24_status = RF24_getStatus();
} while (!(RF24_status & ( _BV(RF24_MAX_RT) | _BV(RF24_TX_DS) )) && timeout--);
// timeout value after successful TX on 16Mhz AVR ~ 65500, i.e. msg is transmitted after ~36 loop cycles
RF24_ce(LOW);
// reset interrupts
RF24_setStatus(_BV(RF24_TX_DS) | _BV(RF24_MAX_RT) );
// Max retries exceeded
if(RF24_status & _BV(RF24_MAX_RT)) {
// flush packet
RF24_DEBUG(PSTR("!RF24:SND:MAX_RT\n")); // max retries, no ACK
RF24_flushTX();
}
RF24_startListening();
// true if message sent
return (RF24_status & _BV(RF24_TX_DS));
}
LOCAL bool RF24_isDataAvailable() {
uint8_t status = RF24_getStatus();
return (((status >> RX_P_NO) & 0b0111) <= 5);
}
