RTOS/CC1310: Measuring RSSI while using th Carrier-Sense Command

Tool/software: TI-RTOS

I want to use the Carrier-Sense command to scan multiple channels for activity using the RSSI threshold. In order to know what is a reasonable threshold to use I need some feedback on the detected RSSI on the channel.

Currently I have set up a command chain that looks like this:

CMD_FS [Set the channel frequency] -> CMD_CS [wait up to 2 ms if IDLE, exit as soon as it is BUSY] -> CMD_GET_RSSI [Immediate command] -> CMD_FS_OFF[turn off the radio]

This is executed via the RF_runCmd function in a TIRTOS thread.

My problem is that all of the RSSI measurements come back with a value of -128 (0xFF80).

Is there a way to get the RSSI data I need using a command chain like this, or do I need to figure out how to do it asynchronously?

The parameters of the CMD_CS command is:

static rfc_CMD_PROP_CS_t RF_Scan_cmdCs =
{
   .commandNo = CMD_PROP_CS,
   .status = 0x0000,
   .pNextOp = (rfc_radioOp_t *) &RF_Scan_cmdReadRSSI,
   .startTime = 0x00000000,
   .startTrigger.triggerType = 0x0,
   .startTrigger.bEnaCmd = 0x0,
   .startTrigger.triggerNo = 0x0,
   .startTrigger.pastTrig = 0x0,
   .condition.rule = COND_ALWAYS,
   .condition.nSkip = 0x0,

   .csFsConf = 0,    // keep the RF on, independent of a carrier detect

   .csConf.bEnaRssi = 1,
   .csConf.bEnaCorr = 0,
   .csConf.operation = 0,
   .csConf.busyOp = 1,      // halt Carrier detect if we detect a busy condition
   .csConf.idleOp = 0,      // Keep scanning as long as it is idle
   .csConf.timeoutRes = 1,  // if we timeout, treat invalid result as Idle

   .rssiThr = -100,   // start with an RSSI threshold of -60 dB
   .numRssiIdle = 2,
   .numRssiBusy = 2,

   // Set the end trigger for 2 ms after we start the carrier detect operation.
   .csEndTrigger.triggerType = TRIG_REL_START,
   .csEndTime = 8000,
};