void halRfFlushRx(void) {
/* Flush RX FIFO twice instead of once. See bug #1 in
* http://www.ti.com/lit/er/swrz024/swrz024.pdf */
halRfDisableRxInterrupt();
CC2520_RXBUF8();
CC2520_INS_STROBE(CC2520_INS_SFLUSHRX);
CC2520_INS_STROBE(CC2520_INS_SFLUSHRX);
halRfEnableRxInterrupt();
}
/***********************************************************************************
* @fn halRfReceiveOn
*
* @brief Turn receiver on
*
* @param none
*
* @return none
*/
void halRfReceiveOn(void) {
/* Flush RX FIFO if needed.
* See bug #1 in http://www.ti.com/lit/er/swrz024/swrz024.pdf */
halRfDisableRxInterrupt();
CC2520_INS_STROBE(CC2520_INS_SFLUSHRX);
uint8_t rx_fifo_cnt = CC2520_REGRD8(CC2520_RXFIFOCNT);
CC2520_INS_STROBE(CC2520_INS_SRXON);
if (rx_fifo_cnt != CC2520_REGRD8(CC2520_RXFIFOCNT)) {
CC2520_INS_STROBE(CC2520_INS_SFLUSHRX);
}
halRfEnableRxInterrupt();
}
/***********************************************************************************
* @fn halRfReceiveOff
*
* @brief Turn receiver off
*
* @param none
*
* @return none
*/
void halRfReceiveOff(void) {
/* Flush RX FIFO if needed.
* See bug #1 in http://www.ti.com/lit/er/swrz024/swrz024.pdf */
halRfDisableRxInterrupt();
CC2520_INS_STROBE(CC2520_INS_SFLUSHRX);
uint8_t rx_fifo_cnt = CC2520_REGRD8(CC2520_RXFIFOCNT);
CC2520_INS_STROBE(CC2520_INS_SRFOFF);
if (rx_fifo_cnt != CC2520_REGRD8(CC2520_RXFIFOCNT)) {
CC2520_INS_STROBE(CC2520_INS_SFLUSHRX);
// Software clean-up
// Reset software for frame reception...
}
halRfEnableRxInterrupt();
}
//RF ISR
void GPABC_IRQHandler(void){
if(GPIOB_ISRC&0x00000200UL){
disable_rf_int();
uz2400_isr_handler();
enable_rf_int();
}
GPIOB_ISRC = GPIOB_ISRC;
#if 0
if (EXTI_GetITStatus(EXTI_Line4) != RESET){
#ifdef SELECT_CC2520
halRfDisableRxInterrupt();
cc2520_isr_handler();
halRfEnableRxInterrupt();
#else
//disable_rf_int();
uz2400_isr_handler();
//enable_rf_int();
#endif
EXTI4_ClearBit();
}
#endif
}
/***********************************************************************************
* @fn halRfInit
*
* @brief Power up, sets default tuning settings, enables autoack and configures
* chip IO
*
* @param none
*
* @return SUCCESS if the radio has started, FAILURE otherwise
*/
uint8 halRfInit(void) {
regVal_t* p;
uint8 val;
// Avoid GPIO0 interrupts during reset
halRfDisableRxInterrupt();
// Make sure to pull the CC2520 RESETn pin low
CC2520_RESET_OPIN(0);
CC2520_SPI_END();
chThdSleepMilliseconds(2);
// Make sure MISO is configured as output.
CC2520_MISO_DIR_OUT();
// Release reset
CC2520_RESET_OPIN(1);
// Wait for XOSC stable to be announced on the MISO pin
if (halRfWaitRadioReady() == FAILED) {
return FAILED;
}
// Write non-default register values
p = regval;
while (p->reg != 0) {
CC2520_MEMWR8(p->reg, p->val);
p++;
}
// ISR Thread
chThdCreateStatic(waIsrTx, sizeof(waIsrTx), NORMALPRIO + 2, isrThread, NULL );
// Verify a register
val = CC2520_MEMRD8(CC2520_MDMCTRL0);
return val == 0x85 ? SUCCESS : FAILED;
}
/***********************************************************************************
* @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;
}
/***********************************************************************************
* @fn basicRfRxFrmDoneIsr
*
* @brief Interrupt service routine for received frame from radio
* (either data or acknowlegdement)
*
* @param rxi - file scope variable info extracted from the last incoming
* frame
* txState - file scope variable that keeps tx state info
*
* @return none
*/
static void basicRfRxFrmDoneIsr(void)
{
basicRfPktHdr_t *pHdr;
uint8 *pStatusWord;
#ifdef SECURITY_CCM
uint8 authStatus=0;
#endif
// Map header to packet buffer
pHdr= (basicRfPktHdr_t*)rxMpdu;
// Clear interrupt and disable new RX frame done interrupt
halRfDisableRxInterrupt();
// Enable all other interrupt sources (enables interrupt nesting)
halIntOn();
// Read payload length.
halRfReadRxBuf(&pHdr->packetLength,1);
pHdr->packetLength &= BASIC_RF_PLD_LEN_MASK; // Ignore MSB
// Is this an acknowledgment packet?
// Only ack packets may be 5 bytes in total.
if (pHdr->packetLength == BASIC_RF_ACK_PACKET_SIZE) {
// Read the packet
halRfReadRxBuf(&rxMpdu[1], pHdr->packetLength);
// Make sure byte fields are changed from network to host byte order
UINT16_NTOH(pHdr->panId);
UINT16_NTOH(pHdr->destAddr);
UINT16_NTOH(pHdr->srcAddr);
#ifdef SECURITY_CCM
UINT32_NTOH(pHdr->frameCounter);
#endif
rxi.ackRequest = !!(pHdr->fcf0 & BASIC_RF_FCF_ACK_BM_L);
// Read the status word and check for CRC OK
pStatusWord= rxMpdu + 4;
// Indicate the successful ACK reception if CRC and sequence number OK
if ((pStatusWord[1] & BASIC_RF_CRC_OK_BM) && (pHdr->seqNumber == txState.txSeqNumber)) {
txState.ackReceived = TRUE;
}
// No, it is data
} else {
// It is assumed that the radio rejects packets with invalid length.
// Subtract the number of bytes in the frame overhead to get actual payload.
rxi.length = pHdr->packetLength - BASIC_RF_PACKET_OVERHEAD_SIZE;
#ifdef SECURITY_CCM
rxi.length -= (BASIC_RF_AUX_HDR_LENGTH + BASIC_RF_LEN_MIC);
authStatus = halRfReadRxBufSecure(&rxMpdu[1], pHdr->packetLength, rxi.length,
BASIC_RF_LEN_AUTH, BASIC_RF_SECURITY_M);
#else
halRfReadRxBuf(&rxMpdu[1], pHdr->packetLength);
#endif
// Make sure byte fields are changed from network to host byte order
UINT16_NTOH(pHdr->panId);
UINT16_NTOH(pHdr->destAddr);
UINT16_NTOH(pHdr->srcAddr);
#ifdef SECURITY_CCM
UINT32_NTOH(pHdr->frameCounter);
#endif
rxi.ackRequest = !!(pHdr->fcf0 & BASIC_RF_FCF_ACK_BM_L);
// Read the source address
rxi.srcAddr= pHdr->srcAddr;
// Read the packet payload
rxi.pPayload = rxMpdu + BASIC_RF_HDR_SIZE;
// Read the FCS to get the RSSI and CRC
pStatusWord= rxi.pPayload+rxi.length;
#ifdef SECURITY_CCM
pStatusWord+= BASIC_RF_LEN_MIC;
#endif
rxi.rssi = pStatusWord[0];
// Notify the application about the received data packet if the CRC is OK
// Throw packet if the previous packet had the same sequence number
if( (pStatusWord[1] & BASIC_RF_CRC_OK_BM) && (rxi.seqNumber != pHdr->seqNumber) ) {
// If security is used check also that authentication passed
#ifdef SECURITY_CCM
if( authStatus==SUCCESS ) {
if ( (pHdr->fcf0 & BASIC_RF_FCF_BM_L) ==
(BASIC_RF_FCF_NOACK_L | BASIC_RF_SEC_ENABLED_FCF_BM_L)) {
rxi.isReady = TRUE;
}
}
#else
if ( ((pHdr->fcf0 & (BASIC_RF_FCF_BM_L)) == BASIC_RF_FCF_NOACK_L) ) {
rxi.isReady = TRUE;
}
#endif
}
rxi.seqNumber = pHdr->seqNumber;
}
// Enable RX frame done interrupt again
halIntOff();
halRfEnableRxInterrupt();
}
