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CC2531: Cannot get RSSI value by using MRFI_Rssi()

Part Number: CC2531

Hi everyone,

I have two cc2531 usb dongles, and I'd like to build a simple rssi measure software.

One dongle works as the sender, it will send a packet. And the other dongle will start to measure the RSSI value for some time when it receives the packet. 

I build the software based on the cc usb software example rf_modem - rfusb_cc2531.

The send and receive part work well, but when I tried to get rssi value by using MRFI_Rssi(), no value returned. Can someone help me with this? Or is there anyway that I can implement the function I want?

And a further question, how long does it take to get a single rssi with MRFI_Rssi(), cause it's different from halSampleED(channel, time) which can set the channel and sample time.

Thank you.

Best,

Geoff