Hardware timer is not able to give interrupt below 13us

[SanketSkyline]

Hello,

I am using nRF52832 DK board. I wanted to drive some o/p signal from the MCU. So for testing purposes, I just toggled one GPIO from the Timer CC channel. For that, I used hardware timer 3  and used its 4 compare channel and configured all in a way 10us, 20us, 30us, and 40us in Conti. mode so that it will run and toggle the GPIO on interrupt of each compare channel. Now I am not able to receive interrupt after every 10us from each CC. I can see some latency and seems like interrupts are overlaping. 

When I set it to 13, 26,39 & 52us it is working. Please suggest to me how to reduce it to 10us.

NOte: I put a statement "NRF_NVMC->ICACHECNF = 0x01;" to enable the cache with this also I am not able to achieve it.

Best Regards,

SC

[Einar Thorsrud]

Hi,

Based on what you write it seems you have an interrupt routine that takes more than 10 us to complete (alone or combined with some other interrupts of same or higher priority that also consumes time). If that is the case, then there is probably no way around trying to optimize or simply do less.