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CC1120 CW transmitter test

Other Parts Discussed in Thread: CC1120

Using my uP connected via SPI to the CC1120 demo board I can set up and calibrate using demo register values.  However, unlike the demo system, I cannot see a carrier in transmit mode or see packets received in receive mode.  In receive mode there is carrier detect and RSSI using another demo board to transmit repeated packets, but no decoded packets.  I am using the same repeated command sequence as the demo board software, as revealed by a Beagle SPI sniffer.

I would like to see the transmitter working first.  How do I set up conditions to generate a CW carrier?  This would be a great first step.

I can worry about the receive mode later, since getting the transmitter carrier on the spectrum analyzer is fundamental!

  • To set the chip up to send a CW, please use SmartRF Studio to find which registers you have to set (select cont. TX, unmodulated). In addition you have to write a byte to the FIFO.

    Another fundamental test in TX is just to strobe TX. The transmitter will then send preamble as long as not anything is written to the FIFO.