cc1125 CARRIER_SENSE_VALID indication

Dennis Zimmerman

We find that when the RSSI is above -128 dBm we get a valid CARRIER_SENSE indication on GPIO2. However, when it is below -128 dBm the CARRIER_SENSE goes valid which is not true. We then try to use CARRIER_SENSE_VALID on GPIO3 but it indicates valid when below -128 dBm. What is going on? I would think CARRIER_SENSE should only be true only when the carrier is above the threshold.

over 8 years ago

0 TER over 8 years ago

TI__Guru**** 317180 points

Have you set AGC_GAIN_ADJUST to something different from 0? Then it could be that you get a wrap around, see e2e.ti.com/.../1559935

0 Dennis Zimmerman over 8 years ago in reply to TER

Prodigy 130 points

Yes, it is set to -90.

0 TER over 8 years ago in reply to Dennis Zimmerman

TI__Guru**** 317180 points

Did you try to set this to 0? You can easily adjust for the RSSI offset in software.

0 Dennis Zimmerman over 8 years ago in reply to TER

Prodigy 130 points

Yes, we have calibrated the receiver. It measures RSSI and the CARRIER_VALID toggles when it goes past the threshold point. But when the carrier goes below -128 dBm the CARRIER_VALID goes true which is non-sense. The CARRIER_VALID only works when we have signal.