CCS/CC1310: Preamble detection

Tool/software: Code Composer Studio

Thanks for your reply. Really what I needed!

But I had a problem.
I slightly changed the example for receiving in turn at 2 frequencies. Reception takes place with a delay of 1 second.

After some time, the processor hangs on the function call.

/* Schedule RX */
RF_runCmd(rfHandle, (RF_Op*)&RF_cmdPropRxSniff, RF_PriorityHigh, &callback, RF_EventRxEntryDone);

Maybe you can explain what could be the reason ?

I used the example based on NoRTOS.

I will give only changed parts of my source. 

// Input Buffer
uint8_t buf[100];
uint8_t len = 0;
volatile bool dataready = false;


/***** Function definitions *****/
/* RX task function. Executed in Task context by TI-RTOS when the scheduler starts. */
void *mainThread(void *arg0)
{
    xUartInit(115200);
    DBGF("\r\nWOR RX start\r\n");

    RF_Params rfParams;
    RF_Params_init(&rfParams);

    /* Open LED pins */
    ledPinHandle = PIN_open(&ledPinState, pinTable);
    if (ledPinHandle == NULL)
    {
        while(1);
    }

    /* Route out LNA active pin to LED1 */
    PINCC26XX_setMux(ledPinHandle, Board_PIN_LED0, PINCC26XX_MUX_RFC_GPO0);

    /* Create queue and data entries */
    if (RFQueue_defineQueue(&dataQueue,
                            rxDataEntryBuffer,
                            sizeof(rxDataEntryBuffer),
                            NUM_DATA_ENTRIES,
                            MAX_LENGTH + NUM_APPENDED_BYTES))
    {
        /* Failed to allocate space for all data entries */
        while(1);
    }

    /* Copy all RX options from the SmartRF Studio exported RX command to the RX Sniff command */
    initializeSniffCmdFromRxCmd(&RF_cmdPropRxSniff, &RF_cmdPropRx);

    /* Configure RX part of RX_SNIFF command */
    RF_cmdPropRxSniff.pQueue    = &dataQueue;
    RF_cmdPropRxSniff.pOutput   = (uint8_t*)&rxStatistics;
    RF_cmdPropRxSniff.maxPktLen = MAX_LENGTH;

    /* Discard ignored packets and CRC errors from Rx queue */
    RF_cmdPropRxSniff.rxConf.bAutoFlushIgnored = 1;
    RF_cmdPropRxSniff.rxConf.bAutoFlushCrcErr  = 1;

    /* Calculate datarate from prescaler and rate word */
    uint32_t datarate = calculateSymbolRate(RF_cmdPropRadioDivSetup.symbolRate.preScale,
                                          RF_cmdPropRadioDivSetup.symbolRate.rateWord);

    /* Configure Sniff-mode part of the RX_SNIFF command */
    configureSniffCmd(&RF_cmdPropRxSniff, WOR_MODE, datarate, WOR_WAKEUPS_PER_SECOND);

    /* Request access to the radio */
    rfHandle = RF_open(&rfObject, &RF_prop, (RF_RadioSetup*)&RF_cmdPropRadioDivSetup, &rfParams);

    RF_cmdPropRxSniff.startTime = RF_getCurrentTime();

    /* Enter main loop */
    while(1)
    {
        PIN_setOutputValue(ledPinHandle, Board_PIN_LED1, 1);

        // -------------------------------------
        /* Set frequency */
        RF_cmdFs.fractFreq = 0x0000;  // xxx.0 MHz
        RF_runCmd(rfHandle, (RF_Op*)&RF_cmdFs, RF_PriorityHigh, 0, 0);

        /* Schedule RX */
        RF_runCmd(rfHandle, (RF_Op*)&RF_cmdPropRxSniff, RF_PriorityHigh, &callback, RF_EventRxEntryDone);

        if(dataready) {
            DBGH("870.0",buf,len);
            dataready = false;
        }


        // -------------------------------------
        /* Set frequency */
        RF_cmdFs.fractFreq = 0x8000;  // xxx.5 MHz
        RF_runCmd(rfHandle, (RF_Op*)&RF_cmdFs, RF_PriorityHigh, 0, 0);

        /* Schedule RX */
        RF_runCmd(rfHandle, (RF_Op*)&RF_cmdPropRxSniff, RF_PriorityHigh, &callback, RF_EventRxEntryDone);

        PIN_setOutputValue(ledPinHandle, Board_PIN_LED1, 0);

        if(dataready) {
            DBGH("870.5",buf,len);
            dataready = false;
        }


        // -------------------------------------
        // Sleep
        RF_yield(rfHandle); // Power down the radio
        sleep(1); // 1s

        // exit RF from sleep
        RF_runCmd(rfHandle, (RF_Op*)&RF_cmdNop, RF_PriorityHigh, 0, 0);
    }
}

/* Called for every received packet and command done */
void callback(RF_Handle h, RF_CmdHandle ch, RF_EventMask e)
{
    /* If we've received a new packet and it's available to read out */
    if (e & RF_EventRxEntryDone)
    {
            /* Get current unhandled data entry */
            currentDataEntry = RFQueue_getDataEntry();

            /* Handle the packet data, located at &currentDataEntry->data:
             * - Length is the first byte with the current configuration
             * - Data starts from the second byte */
            len = packetLength = *(uint8_t*)(&currentDataEntry->data);
            packetDataPointer = (uint8_t*)(&currentDataEntry->data + 1);

            memcpy(buf,packetDataPointer,packetLength);
            dataready = true;

            /* This code block is added to avoid a compiler warning.
            * Normally, an application will reference these variables for
            * useful data. */
            //dummy = packetLength + packetDataPointer[0];

            RFQueue_nextEntry();
    }
}