[Timer0] Unreasonable Behavior and NRFX nrfx_timer_extended_compare function signature

RE: [Timer0] Unreasonable Behavior and NRFX nrfx_timer_extended_compare function signature

Susheel Nuguru — Thu, 01 Aug 2024 06:56:57 GMT

[quote user=""]Is there any case that 2nd arg (=channel) and 3rd arg (=action) not to be the same channel?[/quote]

No this would not work, since the fourth argument (=action) only enables the short and the second argument configures the the intterrupt on the different channel. So if the channels mismatch here, then you configure a cc channel but enable the wrong short which is not what we intend normally to use. But like Turbo_J said, you can be always creative to use the side effects of misuse of API if you are very clear and sure to know what you are doing. But then you are on your own with the side effects.

RE: [Timer0] Unreasonable Behavior and NRFX nrfx_timer_extended_compare function signature

Turbo J — Thu, 01 Aug 2024 06:46:56 GMT

Second question has no clear answer, its possible that you can find a very creative use case for this kind of API abuse.

But I would also always expect a mistake when the channel numbers don't match.

RE: [Timer0] Unreasonable Behavior and NRFX nrfx_timer_extended_compare function signature

Robotics Gun — Wed, 31 Jul 2024 19:18:34 GMT

https://docs.nordicsemi.com/bundle/ncs-latest/page/nrfxlib/mpsl/doc/mpsl.html

Thanks Turbo J Susheel Nuguru .

Susheel Nuguru may I get an answer for 2nd question?

RE: [Timer0] Unreasonable Behavior and NRFX nrfx_timer_extended_compare function signature

Susheel Nuguru — Tue, 30 Jul 2024 12:37:56 GMT

Fischer is right, applications cannot use TIMER0 with the SoftDevice Controller (SDC) on nRF52. The SoftDevice reserves access to TIMER0 for internal timekeeping.

Softdevice reserved peripherals are listed here.

Softdevice have MPSL, that also have reserved peripherals that the application cannot use which are listed here and the TIMER0 as you can see here is restricted to be used by application.

RE: [Timer0] Unreasonable Behavior and NRFX nrfx_timer_extended_compare function signature

Turbo J — Tue, 30 Jul 2024 06:58:12 GMT

AFAIK yes - but read those softdevice specifications yourself. I've not used NRF52x since the switch to zephyr.

RE: [Timer0] Unreasonable Behavior and NRFX nrfx_timer_extended_compare function signature

Robotics Gun — Tue, 30 Jul 2024 06:49:47 GMT

My appliction is to use BLE. Then the timer 0 is used by BLE stack?

Is that what you mean?

RE: [Timer0] Unreasonable Behavior and NRFX nrfx_timer_extended_compare function signature

Turbo J — Tue, 30 Jul 2024 06:43:34 GMT

Careful: Timer0 is normally blocked by SoftDevice. Avoid using that even if you don't use BTLE right now in your project.