/***********************************************************************************
* @fn halSampleED
*
* @brief Sample Energy Detect
*
* @param uint8 channel - channel between 11 and 26
* uint16 sampleTime - sample time in us
*
* @return int8 - sampled RSSI value
*/
int8 halSampleED(uint8 channel, uint16 sampleTime)
{
int8 rssi=0;
// Set channel
halRfSetChannel(channel);
// Set RX on
halRfReceiveOn();
while (!RSSISTAT);
// Enable energy scan mode, using peak signal strength
FRMCTRL0 |= 0x10;
// Spend sampleTime us accumulating the peak RSSI value
halMcuWaitUs(sampleTime);
rssi = RSSI;
// Exit the current channel
halRfReceiveOff();
// Disable ED scan mode
FRMCTRL0 &= ~0x10;
return rssi;
}
/***********************************************************************************
* @fn basicRfReceiveOff
*
* @brief Turns off receiver on radio
*
* @param txState - file scope variable
*
* @return none
*/
void basicRfReceiveOff(void)
{
txState.receiveOn = FALSE;
halRfReceiveOff();
}
/***********************************************************************************
* @fn basicRfSendPacket
*
* @brief Send packet
*
* @param destAddr - destination short address
* pPayload - pointer to payload buffer. This buffer must be
* allocated by higher layer.
* length - length of payload
* txState - file scope variable that keeps tx state info
* mpdu - file scope variable. Buffer for the frame to send
*
* @return basicRFStatus_t - SUCCESS or FAILED
*/
uint8 basicRfSendPacket(uint16 destAddr, uint8* pPayload, uint8 length)
{
uint8 mpduLength;
uint8 status;
// Turn on receiver if its not on
if(!txState.receiveOn) {
halRfReceiveOn();
}
// Check packet length
length = min(length, BASIC_RF_MAX_PAYLOAD_SIZE);
// Wait until the transceiver is idle
halRfWaitTransceiverReady();
// Turn off RX frame done interrupt to avoid interference on the SPI interface
halRfDisableRxInterrupt();
mpduLength = basicRfBuildMpdu(destAddr, pPayload, length);
#ifdef SECURITY_CCM
halRfWriteTxBufSecure(txMpdu, mpduLength, length, BASIC_RF_LEN_AUTH, BASIC_RF_SECURITY_M);
txState.frameCounter++; // Increment frame counter field
#else
halRfWriteTxBuf(txMpdu, mpduLength);
#endif
// Turn on RX frame done interrupt for ACK reception
halRfEnableRxInterrupt();
// Send frame with CCA. return FAILED if not successful
if(halRfTransmit() != SUCCESS) {
status = FAILED;
}
// Wait for the acknowledge to be received, if any
if (pConfig->ackRequest) {
txState.ackReceived = FALSE;
// We'll enter RX automatically, so just wait until we can be sure that the ack reception should have finished
// The timeout consists of a 12-symbol turnaround time, the ack packet duration, and a small margin
halMcuWaitUs((12 * BASIC_RF_SYMBOL_DURATION) + (BASIC_RF_ACK_DURATION) + (2 * BASIC_RF_SYMBOL_DURATION) + 10);
// If an acknowledgment has been received (by RxFrmDoneIsr), the ackReceived flag should be set
status = txState.ackReceived ? SUCCESS : FAILED;
} else {
status = SUCCESS;
}
// Turn off the receiver if it should not continue to be enabled
if (!txState.receiveOn) {
halRfReceiveOff();
}
if(status == SUCCESS) {
txState.txSeqNumber++;
}
#ifdef SECURITY_CCM
halRfIncNonceTx(); // Increment nonce value
#endif
return status;
}