General Radio PA/LNA usage question.

Question

So, my understanding of the current support for a PA/LNA is a set of configuration options you can pass into a BLE library and then the soft device will handle the operation of the pin(s). 
 It is also my understanding that the Softdevice firmware is not available as source (correct me if I am wrong). 
 My question is , would it be possible to extract out the code from the Softdevice source that handles the PA/LNA timing? 
 I am assuming there are timings that are built into the code when the radio is being enabled for transmit and when it is disabled for reception. Is there any way to get those pieces of source and nothing else?? 
 It would really help with people trying to implement ESB.

Susheel Nuguru · Accepted Answer

Anthony, 
 Softdevice is responsible for the radio timing to match the BLE protocol only. And hence it will enable the and disable the PA/LNA pins based on the detail timings it understands on the TX and RX. It could add few delays to compensate jitter and/or do other adjustments to make this efficient. This piece of logic probably is not compatible with other protocols apart from BLE. 
 If you still want to look at the logic of how it is done, you can get best understanding from the opensource projects like Zephyr. 
 Please look into the radio.c file where you can clearly see the setup of PA/LNA using the GPIOTE//PPI channels

General Radio PA/LNA usage question.

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