//------------------------------------------------------------------------------
// void pktRxHandler(void)
//
// DESCRIPTION:
// This function is called every time a timer interrupt occurs. The
// function starts by retreiving the status byte. Every time the status
// byte indicates that there are available bytes in the RX FIFO, bytes are
// read from the RX FIFO and written to RxBuffer. This is done until the
// whole packet is received. If the status byte indicates that there has
// been an RX FIFO overflow the RX FIFO is flushed. Please see the
// EM430F5137RF900 RF Examples User Manual for a flow chart describing this
// function.
//------------------------------------------------------------------------------
void pktRxHandler(void) {
unsigned char RxStatus;
unsigned char bytesInFifo;
// Which state?
RxStatus = Strobe(RF_SNOP);
switch(RxStatus & CC430_STATE_MASK)
{
case CC430_STATE_RX:
// If there's anything in the RX FIFO....
if (bytesInFifo = MIN(rxBytesLeft, RxStatus & CC430_FIFO_BYTES_AVAILABLE_MASK))
{
if((rxBytesLeft == PACKET_LEN + 2) && !lengthByteRead)
{
rxBytesLeft = ReadSingleReg(RXFIFO) + 2; // For appended bytes
lengthByteRead = 1;
}
// Update how many bytes are left to be received
rxBytesLeft -= bytesInFifo;
// Read from RX FIFO and store the data in rxBuffer
while (bytesInFifo--) {
RxBuffer[rxPosition] = ReadSingleReg(RXFIFO);
rxPosition++;
}
if (!rxBytesLeft){
packetReceived = 1;
receiving = 0;
lengthByteRead = 0;
ReceiveOff();
P1OUT ^= BIT0; // Toggle LED1
}
}
break;
default:
if(!packetReceived)
{
packetReceived = 1;
}
rxBytesLeft = 0;
receiving = 0;
ReceiveOff();
break;
}
} // pktRxHandler
void main( void )
{
// Stop watchdog timer to prevent time out reset
WDTCTL = WDTPW + WDTHOLD;
// Increase PMMCOREV level to 2 for proper radio operation
SetVCore(2);
ResetRadioCore();
InitButtonLeds();
InitTimer();
// Clean out the RX Buffer
rxPosition = PACKET_LEN+2;
while(rxPosition--)
{
RxBuffer[rxPosition] = 0;
}
InitRadio();
ReceiveOn();
//Check RSSI here
while (1)
{
P1IE |= BIT7; // Enable button interrupt
__bis_SR_register( LPM3_bits + GIE );
__no_operation();
if (buttonPressed) // Process a button press->transmit
{
ReceiveOff(); // Button means TX, stop RX
receiving = 0;
TransmitPacket();
buttonPressed = 0; // Re-enable button press
}
if(receiving)
{
ReceivePacket();
__no_operation();
// Check CRC
if(RxBuffer[CRC_LQI_IDX] & CRC_OK)
//Got it!
P1OUT ^= BIT0; // Toggle LED1 in celebration
}
if(!transmitting)
{
ReceiveOn();
}
}
}
void RF_Connection_Test(void)
{
Init_RF();
timer1_A3_Up_Mode;
while(1){
if (buttonPressed) // Process a button pressed --> transmit
{
//P3OUT |= BIT6; // Pulse LED during Transmit
buttonPressed = 0;
P1IFG = 0;
ReceiveOff();
Transmit( (unsigned char*)TxBuffer, sizeof TxBuffer);
//Wait for TX status to be reached before going back to low power mode
while((Strobe(RF_SNOP) & 0x70) != 0x20);
P1IE |= BIT1; // Re-enable button press
}
else if (packetTransmit)
{
RF1AIE &= ~BIT9; // Disable RFIFG9 TX end-of-packet interrupts
//P3OUT &= ~BIT6; // Turn off LED after Transmit
ReceiveOn();
//Wait for RX status to be reached
while((Strobe(RF_SNOP) & 0x70) != 0x10);
packetTransmit = 0;
}
else if(packetReceived) // Process a received packet
{
char toggle = 1;
// Read the length byte from the FIFO
RxBufferLength = ReadSingleReg( RXBYTES );
ReadBurstReg(RF_RXFIFORD, RxBuffer, RxBufferLength);
// Check the packet contents and don't toggle LED if they are different
for(i = 0; i < RxBuffer[0]; i++)
{
if(RxBuffer[i] != TxBuffer[i]) toggle = 0;
}
if(toggle){
LED_Togg; // Toggle LED
packetReceived = 0;
}
}
}
}
void Send_Data(unsigned char ADDRESS, unsigned char* Data)
{
unsigned char TxBuffer[PACKET_LEN];
append(Data, ADDRESS, TxBuffer);
ReceiveOff();
receiving = 0;
Transmit( (unsigned char*)TxBuffer, sizeof TxBuffer);
transmitting = 1;
}
void main( void )
{
// Stop watchdog timer to prevent time out reset
WDTCTL = WDTPW + WDTHOLD;
TA1CCTL0 = CCIE; // CCR0 interrupt enabled
TA1CCR0 = 50000;
TA1CTL = TASSEL_2 + MC_1 + TACLR; // SMCLK, upmode, clear TAR
__bis_SR_register(GIE);
//WDTCTL = WDT_ARST_250;
//SFRIE1 |= WDTIE; // Enable WDT interrupt
// Increase PMMCOREV level to 2 for proper radio operation
SetVCore(2);
ResetRadioCore();
InitRadio();
InitButtonLeds();
InitUart();
ReceiveOn();
receiving = 1;
_EINT();
while (1)
{
//WDTCTL = WDT_ARST_250;
// __bis_SR_register( LPM3_bits + GIE );
__no_operation();
if((!(BUTTON_IN & (1<<BUTTON_BIT))))
{
_NOP();
delayms(30);
if(!(BUTTON_IN & (1<<BUTTON_BIT)))
{
_NOP();
buttonPressed = 1;
LEDR_ON();
ReceiveOff();
receiving = 0;
Transmit( (unsigned char*)TxBuffer,sizeof TxBuffer);
transmitting = 1;
while(!(BUTTON_IN & (1<<BUTTON_BIT)));
}
}
if(!transmitting)
{
ReceiveOn();
receiving = 1;
}
if(buttonPressed && transmit == 1)
{
LEDR_ON();
ReceiveOff();
receiving = 0;
Transmit( (unsigned char*)TxBuffer,sizeof TxBuffer);
transmitting = 1;
transmit = 0;
receive = 1;
delayms(500);
buttonPressed = 0;
}
if(count == 20 && buttonPressed == 0 && receive == 1)
{
buttonPressed = 1;
count = 0;
transmit = 1;
receive = 0;
}
}
}