CC1312R: Issues fetching the RSSI of a received packet

Hello,

I'm trying to use the RSSI of received packets to inform some behavior in my application, but I'm having some issues reading the value of the received packet. I am using a CC1312 with SDK v5.20 and the proprietary rf mode. When I connect my MCU through to SmartRF studio, with the same configuration settings, I see correctly reported RSSI values that make sense to me and vary relative to distance between tx and rx as expected.

In my own application, however, when I try to read the RSSI value that has been appended to the queue entry, is appears to be a nonsense value. The other values appear to be correct, the appended timestamp is increasingly monotonically.

if (e & RF_EventRxEntryDone)
    {
        rfc_dataEntryGeneral_t* queue_entry = queueCurrentEntry(&waitForSyncQueue);
        uint8_t *data_entry = (uint8_t *)&queue_entry->data;
        message_length = *data_entry;
        memcpy(operating_message, data_entry + 1, message_length);
        memcpy(&message_rssi, data_entry + 1 + MAX_PACKET_LENGTH, 1);
        memcpy(&message_status, data_entry + 6 + MAX_PACKET_LENGTH, 1);
        memcpy(&message_timestamp, data_entry + 2 + MAX_PACKET_LENGTH, 4);

        int8_t func_rssi = RF_getRssi(radio_.handle);

        queueNextEntry(&waitForSyncQueue);
        SMPost(kSMEventPacketReceived);
    }

I am attempting to read the RSSI value through both the appended value and the RF_getRssi() function provided by the SDK, but that always reports RF_GET_RSSI_ERROR_VAL. I am confident in the behavior of my data_queues, since the data is correct in addition to the timestamps making sense.

The following is the radio command that I am currently testing with:

static rfc_CMD_PROP_RX_t waitforSyncRX = {
    .commandNo = 0x3802,
    .status = 0x0000,
    .pNextOp = 0,
    .startTime = 0x00000000,
    .startTrigger.triggerType = TRIG_NOW,
    .startTrigger.bEnaCmd = 0x0,
    .startTrigger.triggerNo = 0x0,
    .startTrigger.pastTrig = 0x0,
    .condition.rule = 0x1,
    .condition.nSkip = 0x0,
    .pktConf.bFsOff = 0x0,
    .pktConf.bRepeatOk = false,
    .pktConf.bRepeatNok = true,
    .pktConf.bUseCrc = 0x1,
    .pktConf.bVarLen = 0x0,
    .pktConf.bChkAddress = 0x0,
    .pktConf.endType = 0x0,
    .pktConf.filterOp = 0x0,
    .rxConf.bAutoFlushIgnored = true,
    .rxConf.bAutoFlushCrcErr = true,
    .rxConf.bIncludeHdr = false,
    .rxConf.bIncludeCrc = 0x0,
    .rxConf.bAppendRssi = true,
    .rxConf.bAppendTimestamp = true,
    .rxConf.bAppendStatus = true,
    .syncWord = 0x930B51DE,
    .maxPktLen = MAX_PACKET_LENGTH,
    .address0 = 0xAA,
    .address1 = 0xBB,
    .endTrigger.triggerType = TRIG_NEVER,
    .endTrigger.bEnaCmd = 0x1,
    .endTrigger.triggerNo = 0x2,
    .endTrigger.pastTrig = 0x0,
    .endTime = 0x00000000,
    .pQueue = &waitForSyncQueue.data_queue,
    .pOutput = 0
};

Here are the radio overrides and the setup function:

uint32_t pOverrides[] =
{
    // override_prop_common.json
    // DC/DC regulator: In Tx, use DCDCCTL5[3:0]=0x7 (DITHER_EN=0 and IPEAK=7).
    (uint32_t)0x00F788D3,
    // override_prop_common_sub1g.json
    // Set RF_FSCA.ANADIV.DIV_SEL_BIAS = 1. Bits [0:16, 24, 30] are don't care..
    (uint32_t)0x4001405D,
    // Set RF_FSCA.ANADIV.DIV_SEL_BIAS = 1. Bits [0:16, 24, 30] are don't care..
    (uint32_t)0x08141131,
    // override_tc106.json
    // Tx: Configure PA ramp time, PACTL2.RC=0x3 (in ADI0, set PACTL2[4:3]=0x3)
    ADI_2HALFREG_OVERRIDE(0,16,0x8,0x8,17,0x1,0x1),
    // Rx: Set AGC reference level to 0x1A (default: 0x2E)
    HW_REG_OVERRIDE(0x609C,0x001A),
    // Rx: Set RSSI offset to adjust reported RSSI by -1 dB (default: -2), trimmed for external bias and differential configuration
    (uint32_t)0x000188A3,
    // Rx: Set anti-aliasing filter bandwidth to 0xD (in ADI0, set IFAMPCTL3[7:4]=0xD)
    ADI_HALFREG_OVERRIDE(0,61,0xF,0xD),
    // Tx: Set wait time before turning off ramp to 0x1A (default: 0x1F)
    HW_REG_OVERRIDE(0x6028,0x001A),
    // override_patable_14dbm.json
    // Tx: Set PA trim to max to maximize its output power (in ADI0, set PACTL0=0xF8)
    ADI_REG_OVERRIDE(0,12,0xF8),
    // radio_overrides.h
    APP_OVERRIDES(),
    (uint32_t)0xFFFFFFFF
};



// CMD_PROP_RADIO_DIV_SETUP
// Proprietary Mode Radio Setup Command for All Frequency Bands
rfc_CMD_PROP_RADIO_DIV_SETUP_t RF_cmdPropRadioDivSetup =
{
    .commandNo = 0x3807,
    .status = 0x0000,
    .pNextOp = 0,
    .startTime = 0x00000000,
    .startTrigger.triggerType = 0x0,
    .startTrigger.bEnaCmd = 0x0,
    .startTrigger.triggerNo = 0x0,
    .startTrigger.pastTrig = 0x0,
    .condition.rule = 0x1,
    .condition.nSkip = 0x0,
    .modulation.modType = 0x1,
    .modulation.deviation = 0x1F4,
    .modulation.deviationStepSz = 0x0,
    .symbolRate.preScale = 0xF,
    .symbolRate.rateWord = 0x50000,
    .symbolRate.decimMode = 0x0,
    .rxBw = 0x60,
    .preamConf.nPreamBytes = 0x2,
    .preamConf.preamMode = 0x1,
    .formatConf.nSwBits = 0x20,
    .formatConf.bBitReversal = 0x0,
    .formatConf.bMsbFirst = 0x1,
    .formatConf.fecMode = 0x0,
    .formatConf.whitenMode = 0x1,
    .config.frontEndMode = 0x0,
    .config.biasMode = 0x1,
    .config.analogCfgMode = 0x0,
    .config.bNoFsPowerUp = 0x0,
    .config.bSynthNarrowBand = 0x0,
    .txPower = 0x013F,
    .pRegOverride = pOverrides,
    .centerFreq = 0x0393,
    .intFreq = 0x8000,
    .loDivider = 0x05
};

My application has had no other issues using the radio thus far, and I would appreciate any information about what may be the issue with reporting of the RSSI value.