CC1312R: Frequency offset Read

Oleg Shepel

Part Number: CC1312R
Other Parts Discussed in Thread: CC1310

Hello!

Previously we used "Frequency Offset" on received packets feature with CC1310:

rfc_CMD_READ_RFREG_t RF_cmdReadRfregFreqOffset =

{
.commandNo = 0x0601,
.address = 0x5154,
.value = 0,
};

RF_runImmediateCmd(rfHandle, (uint32_t*)&RF_cmdReadRfregFreqOffset);

offset = RF_cmdReadRfregFreqOffset.value;

With this offset information we could do a frequency calibration of nodes in network "on-the-fly".

Now we are moving to CC1312 and this command always returns "0".

Is the command 0x0601 still supported on new crystals?

Thank you!

over 4 years ago

0 TER over 4 years ago

TI__Guru**** 317180 points

Could you test the second method listed here to see if you read out something else than 0?

I assume you do the testing with a know offset between the RX and TX node.

0 Oleg Shepel over 4 years ago in reply to TER

Prodigy 50 points

TER, do we have to change something in easylink (simplelink_cc13x2_sdk_2_30_00_45 / rtos) after appending this override to see additional status bytes?

0 TER over 4 years ago in reply to Oleg Shepel

TI__Guru**** 317180 points

Yes,in addition to the override listed you have to ensure that you read one extra byte from the receive buffer since the frequency offset information is one byte extra.

0 Oleg Shepel over 4 years ago in reply to TER

Prodigy 50 points

It seems that applying needed override before last (uint32_t)0xFFFFFFFF of "pOverrides_fsk" (we use predefined EasyLink_Phy_50kbps2gfsk mode) does not make sense.

To make sure, we set .rxConf.bAppendRssi to 0x1 and we can see correct RSSI appended to data in rxBuffer (the same value as in rxStatistics.lastRssi).

Offset value according to your picture must be present in rxBuffer right before RSSI value if override is active, but it is not there: <end of payload><rssi value>

We are using LaunchPad CC1312R1 rev.A with a silicon revision C (1.1), can it be a problem?

0 TER over 4 years ago in reply to Oleg Shepel

TI__Guru**** 317180 points

We no longer support rev C. The feature I describe is added on revv E and will not work on rev C.

0 Oleg Shepel over 4 years ago in reply to TER

Prodigy 50 points

Thank you, TER!

What about previous method, that we successfully used on CC1310 (RF_cmdReadRfregFreqOffset)?

Will it be supported on CC13x2 rev. E ?

0 TER over 4 years ago in reply to Oleg Shepel

TI__Guru**** 317180 points

I have no indications on that this methods should not work on rev E.

0 Oleg Shepel over 4 years ago in reply to TER

Prodigy 50 points

I've got CC1352R1 LaunchPad with chip rev.E

First method (RF_cmdReadRfregFreqOffset) does not return anything else except "0" (probably something important was changed on silicon 13x0 -> 13x2)

But second method (with override) works OK.

Thank you, TER!

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CC1312R: Frequency offset Read