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Case ID: 106005

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BLE4.0 TX frequency

wiki over 10 years ago

Hello NORDIC

We found that TX frequency error is quite large. Is it able to compensate TX frequency by software ?

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RK over 10 years ago +1

How large? How have you measured it? Is this a reference design or your own custom board? If custom then how tuned is your crystal oscillator as that is the largest factor in TX frequency. No you can…
RK over 10 years ago +1 verified

Are you running a softdevice? Those registers are part of the RADIO module so you can't access them. So they're no use to you and you have to fix the crystal oscillator. Have you read the Crystal Oscillator…
RK over 10 years ago in reply to RK +1

I've said what I think about it twice now, you can't do it. Trim registers do exist which possibly allow TX frequency trimming for proprietary uses of the radio, however they are both relatively undocumented…

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0 John over 10 years ago

Well, there appears to be trim registers for the radio peripheral that could be used to adjust the TX frequency. Not a game I'd want to be playing though.
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0 John over 10 years ago in reply to John

I agree the softdevice would likely be an issue. Plus from what you can learn from the reference manual it sounds like the registers would be loaded with factory calibration data by the softdevice. It would be better to address the tuning of the circuit.
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0 John over 10 years ago in reply to John

I agree the softdevice would likely be an issue. Plus from what you can learn from the reference manual it sounds like the registers would be loaded with factory calibration data by the softdevice. It would be better to address the tuning of the circuit.
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