I am attempting to use TIMER4 on an nRF53832 using SDK 12.2.0 but I seem to be running into some sort of granularity issue.
Specifically, if set up the timer with 16MHz clocking and 32 bit width and I then use compare register 1, I seem to only get a granularity of about 45 microseconds.
I am toggling a GPIO line and measuring how long it takes between the timer starting from a zero count until the compare event is received using an oscilloscope to measure the time difference. If I set the compare register for 60 microseconds (960) ticks, I measure the the time difference on the 'scope as 52.0 microseconds. I then tried increasing the compare register setting by 5 microseconds (80 ticks) each try. At 70 microseconds, the measured interval is 97.2 microseconds. The measured time difference remained at 97.2 microseconds for each 5 microsecond compare register value up to 95 microseconds where I stopped measuring.
I assume there is some setup value (maybe in sdk_config.h) that I need to set appropriately but I have not had any success in trying to figure this out. Any ideas on where I should look?
