Restarting timer inside its own IRQ

RE: Restarting timer inside its own IRQ

Jose Cazarin — Mon, 30 Mar 2020 16:01:27 GMT

Another question:
Is the TIMER3 only used for the esb stack in the NRF2832?
Cause the only references to TIMER3 in the sdk are:

// nRF52 address fix timer and PPI defines
#define NRF_ESB_PPI_BUGFIX1 9
#define NRF_ESB_PPI_BUGFIX2 8
#define NRF_ESB_PPI_BUGFIX3 7

#define NRF_ESB_BUGFIX_TIMER NRF_TIMER3
#define NRF_ESB_BUGFIX_TIMER_IRQn TIMER3_IRQn
#define NRF_ESB_BUGFIX_TIMER_IRQHandler TIMER3_IRQHandler
#endif

So it looks like its just used on the NRF2832 device as bugfix

RE: Restarting timer inside its own IRQ

Jose Cazarin — Fri, 27 Mar 2020 14:42:22 GMT

I switched to another instance of the timer and that worked! So the recommendation is that user code never uses TIMER_2 and TIMER_3 when also running the ESB?
Thanks!

RE: Restarting timer inside its own IRQ

haakonsh — Fri, 27 Mar 2020 14:25:29 GMT

Yeah, that's it. I'm surprised you're able to run any ESB links at all.

RE: Restarting timer inside its own IRQ

Jose Cazarin — Fri, 27 Mar 2020 14:11:15 GMT

I'm using a function to measure the time between two interrupts. I should see a 200ms difference between the values that this function outputs, but I'm seeing the value I mentioned
Im using TIMER2 and I just saw at the docs that the ESB stack uses timer 2 as well (https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.3.0%2Fesb_users_guide.html&cp=5_1_5_2_1&anchor=esb_config)

So I think this might be the problem, Im gonna this with another instance of the system timers

RE: Restarting timer inside its own IRQ

haakonsh — Fri, 27 Mar 2020 10:13:37 GMT

[quote user=""]I'm trying to make it interrupt 200ms after it is started, but no matter what value I load into the CC register, it always interrupts after around 70ms-80ms[/quote]

How do you know it interrupts after 70-80ms?

Do you share this TIMER instance with the ESB stack, and if so does the ESB stack use the timer at the same time as you're using it?