static void runTX(char c1, char c2, char c3, char c4)
{
// Initialize packet buffer of size PKTLEN + 1
uint8 txBuffer[PKTLEN+1] = {0};
P2SEL &= ~0x40; // P2SEL bit 6 (GDO0) set to one as default. Set to zero (I/O)
// connect ISR function to GPIO0, interrupt on falling edge
trxIsrConnect(GPIO_0, FALLING_EDGE, &radioRxTxISR);
// enable interrupt from GPIO_0
trxEnableInt(GPIO_0);
// create a random packet with PKTLEN + 2 byte packet counter + n x random bytes
createPacket(txBuffer, c1, c2, c3, c4);
// write packet to tx fifo
cc11xLSpiWriteTxFifo(txBuffer,sizeof(txBuffer));
// strobe TX to send packet
trxSpiCmdStrobe(CC110L_STX);
// wait for interrupt that packet has been sent.
// (Assumes the GPIO connected to the radioRxTxISR function is set
// to GPIOx_CFG = 0x06)
while(!packetSemaphore);
// clear semaphore flag
packetSemaphore = ISR_IDLE;
halLedToggle(LED1);
__delay_cycles(250000);
halLedToggle(LED1);
}
/******************************************************************************
* @fn runRX
*
* @brief puts radio in RX and waits for packets. Function assumes
* that status bytes are appended in the RX_FIFO
* Update packet counter and display for each packet received.
*
* @param none
*
* @return none
*/
void cc120xRunRX(void){
uint8 rxBuffer[128] = {0};
uint8 rxBytes;
uint8 marcStatus;
// Write radio registers
registerConfig();
// Connect ISR function to GPIO0, interrupt on falling edge
trxIsrConnect(&radioRxTxISR);
// Enable interrupt from GPIO_0
trxEnableInt();
// Update LCD
updateLcd();
// Set radio in RX
trxSpiCmdStrobe(CC120X_SRX);
// Loop until left button is pushed (exits application)
while(BSP_KEY_LEFT != bspKeyPushed(BSP_KEY_ALL)){
// Wait for packet received interrupt
if(packetSemaphore == ISR_ACTION_REQUIRED){
// Read number of bytes in rx fifo
cc120xSpiReadReg(CC120X_NUM_RXBYTES, &rxBytes, 1);
// Check that we have bytes in fifo
if(rxBytes != 0){
// Read marcstate to check for RX FIFO error
cc120xSpiReadReg(CC120X_MARCSTATE, &marcStatus, 1);
// Mask out marcstate bits and check if we have a RX FIFO error
if((marcStatus & 0x1F) == RX_FIFO_ERROR){
// Flush RX Fifo
trxSpiCmdStrobe(CC120X_SFRX);
}
else{
// Read n bytes from rx fifo
cc120xSpiReadRxFifo(rxBuffer, rxBytes);
// Check CRC ok (CRC_OK: bit7 in second status byte)
// This assumes status bytes are appended in RX_FIFO
// (PKT_CFG1.APPEND_STATUS = 1.)
// If CRC is disabled the CRC_OK field will read 1
if(rxBuffer[rxBytes-1] & 0x80){
// Update packet counter
packetCounter++;
}
}
}
// Update LCD
updateLcd();
// Reset packet semaphore
packetSemaphore = ISR_IDLE;
// Set radio back in RX
trxSpiCmdStrobe(CC120X_SRX);
}
}
// Reset packet counter
packetCounter = 0;
// Put radio to sleep and exit application
trxSpiCmdStrobe(CC120X_SPWD);
}
