How to use input pin timer / capture function in zephyr API

Question

I have a application where I need to time acurately the time between two enternal pin signals. I have this working using the 
 
 k_timer which & read & restart within the GPIO ISR. This works well unit I enable BT then the timings are wrong use to the BT ISR having higher priority. 
 
 I guessing I can use the timer/capture function to capture & restart the timer, this can then generate an interrupt which I can process the captured values. The varying IRQ latency would then be no longer an issue. 
 
 I'm using up-to-date uNR Connect for VS Code & the Extention pack

John Galvin · Answer

Thank you this should help me with further parts for my project. 
 I now have GPIOTE, PPI, TIMER1 & TIMER 2 all working at I want them too 
 Just as an aside, I building this into the Nordic UART Bridge Service (NUS) sample (ntf/samples/bluetooth/peripheral_uart) & after some time of stuggling I found that TIMER0 was throwing an exception & looking thru the map file & source files I found the irq_tables.c has this device pointing at .text.mpsl_timer0_isr_wrapper. There is nothing in this sample code documentation that mentions the use of TIMER0. 
 Is there any other resurces that are not avaiable if I build my application based on this sample code?

How to use input pin timer / capture function in zephyr API

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