/***********************************************************************************
* @fn basicRfInit
*
* @brief Initialise basic RF datastructures. Sets channel, short address and
* PAN id in the chip and configures interrupt on packet reception
*
* @param pRfConfig - pointer to BASIC_RF_CONFIG struct.
* This struct must be allocated by higher layer
* txState - file scope variable that keeps tx state info
* rxi - file scope variable info extracted from the last incoming
* frame
*
* @return none
*/
uint8 basicRfInit(basicRfCfg_t* pRfConfig)
{
if (halRfInit()==FAILED)
return FAILED;
halIntOff();
// Set the protocol configuration
pConfig = pRfConfig;
rxi.pPayload = NULL;
txState.receiveOn = TRUE;
txState.frameCounter = 0;
// Set channel
halRfSetChannel(pConfig->channel);
// Write the short address and the PAN ID to the CC2520 RAM
halRfSetShortAddr(pConfig->myAddr);
halRfSetPanId(pConfig->panId);
// if security is enabled, write key and nonce
#ifdef SECURITY_CCM
basicRfSecurityInit(pConfig);
#endif
// Set up receive interrupt (received data or acknowlegment)
halRfRxInterruptConfig(basicRfRxFrmDoneIsr);
halIntOn();
return SUCCESS;
}
/***********************************************************************************
* @fn usbInProcess
*
* @brief Handle traffic flow from RF to USB.
*
* @param none
*
* @return none
*/
static void usbInProcess(void)
{
//uint8 length;
// USB ready to accept new IN packet
halIntOff();
oldEndpoint = USBFW_GET_SELECTED_ENDPOINT();
USBFW_SELECT_ENDPOINT(4);
// The IN endpoint is ready to accept data
if ( USBFW_IN_ENDPOINT_DISARMED() )
{
if (usb_sendack)
{
// modify and return received packet
usbfwWriteFifo(&USBF4, usb_buffer[2], &usb_buffer[0]);
usb_sendack = 0;
// Flag USB IN buffer as not ready (disarming EP4)
USBFW_SELECT_ENDPOINT(4);
USBFW_ARM_IN_ENDPOINT(); // Send data to the host
}
/* // Number of bytes present in RF buffer
length= bufNumBytes(&rbTxBuf);
if (length>0) {
// Limit the size
if (length > USB_MAX_PACKET_SIZE)
{
length = USB_MAX_PACKET_SIZE;
}
// Read from UART TX buffer
bufGet(&rbTxBuf,buffer,length);
// Write to USB FIFO
usbfwWriteFifo(&USBF4, length, buffer);
// Flag USB IN buffer as not ready (disarming EP4)
USBFW_SELECT_ENDPOINT(4);
USBFW_ARM_IN_ENDPOINT(); // Send data to the host
}*/
}
USBFW_SELECT_ENDPOINT(oldEndpoint);
halIntOn();
}
/***********************************************************************************
* @fn usbOutProcess
*
* @brief Handle traffic flow from USB to RF.
*
* @param none
*
* @return none
*/
static void usbOutProcess(void)
{
uint8 length, nToSend;
// If new packet is ready in USB FIFO
halIntOff();
oldEndpoint = USBFW_GET_SELECTED_ENDPOINT();
USBFW_SELECT_ENDPOINT(4);
if (USBFW_OUT_ENDPOINT_DISARMED() ) {
// Get length of USB packet, this operation must not be interrupted.
length = USBFW_GET_OUT_ENDPOINT_COUNT_LOW();
length+= (int)(USBFW_GET_OUT_ENDPOINT_COUNT_HIGH()) >> 8;
// Calculate number of bytes available in RF buffer; and the number
// of bytes we may transfer in this operation.
nToSend= MIN(BUF_SIZE - bufNumBytes(&rbRxBuf), length);
// Space available in UART RX buffer ?
if (nToSend>0)
{
// Read from USB FIFO
usbfwReadFifo(&USBF4, nToSend, buffer);
// Write to radio TX buffer
bufPut(&rbRxBuf,buffer,nToSend);
// If entire USB packet is read from buffer
if (length == nToSend)
{
USBFW_SELECT_ENDPOINT(4);
USBFW_ARM_OUT_ENDPOINT();
}
}
}
USBFW_SELECT_ENDPOINT(oldEndpoint);
halIntOn();
}
/**********************************************************************************
* @fn basicRfReceive
*
* @brief Copies the payload of the last incoming packet into a buffer
*
* @param pRxData - pointer to data buffer to fill. This buffer must be
* allocated by higher layer.
* len - Number of bytes to read in to buffer
* rxi - file scope variable holding the information of the last
* incoming packet
*
* @return uint8 - number of bytes actually copied into buffer
*/
uint8 basicRfReceive(uint8* pRxData, uint8 len, int16* pRssi)
{
// Accessing shared variables -> this is a critical region
// Critical region start
halIntOff();
memcpy(pRxData, rxi.pPayload, min(rxi.length, len));
if(pRssi != NULL) {
if(rxi.rssi < 128){
*pRssi = rxi.rssi - halRfGetRssiOffset();
}
else{
*pRssi = (rxi.rssi - 256) - halRfGetRssiOffset();
}
}
rxi.isReady = FALSE;
halIntOn();
// Critical region end
return min(rxi.length, len);
}
static void appSwitch()
{
/****************************************************************by boo
halLcdWriteLine(HAL_LCD_LINE_1, "Switch");
halLcdWriteLine(HAL_LCD_LINE_2, "Joystick Push");
halLcdWriteLine(HAL_LCD_LINE_3, "Send Command");*/
#ifdef ASSY_EXP4618_CC2420
halLcdClearLine(1);
halLcdWriteSymbol(HAL_LCD_SYMBOL_TX, 1);
#endif
// Initialize BasicRF
basicRfConfig.myAddr = SWITCH_ADDR;
if(basicRfInit(&basicRfConfig)==FAILED) {
HAL_ASSERT(FALSE);
}
pTxData[0] = LIGHT_TOGGLE_CMD;
// Keep Receiver off when not needed to save power
basicRfReceiveOff();
// Main loop
while (TRUE) {
//if( halJoystickPushed() )**********************by boo
if(halButtonPushed()==HAL_BUTTON_1)//**************by boo
{
basicRfSendPacket(LIGHT_ADDR, pTxData, APP_PAYLOAD_LENGTH);
P1_1=~P1_1;
// Put MCU to sleep. It will wake up on joystick interrupt
halIntOff();
halMcuSetLowPowerMode(HAL_MCU_LPM_3); // Will turn on global
// interrupt enable
halIntOn();
}
}
}
/***********************************************************************************
* @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();
}
/***********************************************************************************
* @fn usbOutProcess
*
* @brief Handle traffic flow from USB to RF.
*
* @param none
*
* @return none
*/
static void usbOutProcess(void)
{
uint8 length, /*nToSend,*/ packetlength=0;
// If new packet is ready in USB FIFO
halIntOff();
oldEndpoint = USBFW_GET_SELECTED_ENDPOINT();
USBFW_SELECT_ENDPOINT(4);
if (USBFW_OUT_ENDPOINT_DISARMED() ) {
// Get length of USB packet, this operation must not be interrupted.
length = USBFW_GET_OUT_ENDPOINT_COUNT_LOW();
length+= USBFW_GET_OUT_ENDPOINT_COUNT_HIGH() >> 8;
// Avoid overflow
message_length = USB_MAX_MESSAGE_LENGTH;
if (usb_bufferIndex + length > USB_MAX_MESSAGE_LENGTH) usb_bufferIndex=0;
// Copy received bytes from FIFO to buffer
usbfwReadFifo(&USBF4, length, &usb_buffer[usb_bufferIndex]);
// Increase buffer index
usb_bufferIndex += length;
// If entire USB packet is read from buffer
USBFW_SELECT_ENDPOINT(4);
USBFW_ARM_OUT_ENDPOINT();
// get packet lenght from byte #2 of received packet
if ((usb_bufferIndex >= 2) && (packetlength == 0)) packetlength = usb_buffer[2];
if ((usb_bufferIndex > packetlength-1) && (packetlength >= USB_MIN_MESSAGE_LENGTH))
{
//extract data from packet
usb_decode();
usb_bufferIndex = 0;
}
/*
// Calculate number of bytes available in RF buffer; and the number
// of bytes we may transfer in this operation.
nToSend= MIN(BUF_SIZE - bufNumBytes(&rbRxBuf), length);
// Space available in UART RX buffer ?
if (nToSend>0)
{
// Read from USB FIFO
usbfwReadFifo(&USBF4, nToSend, buffer);
// Write to radio TX buffer
bufPut(&rbRxBuf,buffer,nToSend);
// If entire USB packet is read from buffer
if (length == nToSend)
{
USBFW_SELECT_ENDPOINT(4);
USBFW_ARM_OUT_ENDPOINT();
}
}*/
}
USBFW_SELECT_ENDPOINT(oldEndpoint);
halIntOn();
}
