Fast frequency hopping

[kaklik]

The application which uses CLKGEN01A driver for rapid frequency tunnig should not need to call recall_nvm() method. Instead of this, the recall_nvm() should be called in CLKGEN init code only.

There is an example of such a wrong use case
https://github.com/MLAB-project/pysdr/blob/dev/detectors/noise_level.py

The better approach would be a holding the NVM data in the program memory, therefore there should not be a need to call slow I2C transaction.