nRF52820 PWM

RE: nRF52820 PWM

Mishka — Tue, 28 Apr 2020 10:33:21 GMT

The extended comparison table which lists what supports what can be found at the following address:

https://infocenter.nordicsemi.com/topic/struct_nrf52/struct/nrf52.html

The nRF52820 has no hardware PWM. At the same time, a TIMER based implementation can be used.

RE: nRF52820 PWM

haakonsh — Tue, 31 Mar 2020 07:24:36 GMT

You'll have to ask our RSM for Ukraine, Michna Maciej at Maciej.Michna@nordicsemi.no, for any roadmap updates.

RE: nRF52820 PWM

Mishka — Mon, 30 Mar 2020 14:50:15 GMT

Oh, I see, the comp is there. Anyway, I'll probably go with 52811 for now and will keep the 52833 as plan B. Thanks!

BTW, do you by chance know would it be possible to use 52833 in QFN-40 package as drop-in replacement for the 52811?

RE: nRF52820 PWM

haakonsh — Mon, 30 Mar 2020 10:54:59 GMT

You can use the COMP peripheral to monitor battery voltage.

The nRF52833 has some more features than the nRF52820 again.

RE: nRF52820 PWM

Mishka — Mon, 30 Mar 2020 10:34:41 GMT

Right, the PWM library could do it, but for my project I need it really stable so hardware implementation is more preferred.

I see the nRF52811 has one 4-channel driver and initially I planned to employ it. But the recently released nRF52820 can be powered directly from a lithium battery - this could address a whole bunch of voltage issues for me. By the way, I see the 820 has no SAADC as well, which perhaps means it'll be impossible to monitor battery voltage :-(

RE: nRF52820 PWM

haakonsh — Mon, 30 Mar 2020 08:40:45 GMT

The 52820 and 52811 are stripped-down versions of the nRF52833, neither has the PWM peripheral.

You can create a PWM with the TIMER and GPIOTE peripherals though, see the PWM library.

RE: nRF52820 PWM

Mishka — Sat, 28 Mar 2020 12:54:01 GMT

Yep, every other nRF52 family SoC has at least one 4-channel PWM module with EasyDMA - hence the question.

RE: nRF52820 PWM

navigator — Sat, 28 Mar 2020 12:49:56 GMT

Kinda looks that way in terms of a nice peripheral interface. The OPS v0.7.1 mentions PWM exactly once, in the same cookie cutter language as the other OPS docs (see below). And then never mentions it again.

The PPI system allows a TIMER event to trigger a task of any other system peripheral of the device. The PPI system also enables the TIMER task/event features to generate periodic output and PWM signals to any GPIO. The number of input/outputs used at the same time is limited by the number of GPIOTE channels.

You could setup PWM manually I suppose with interrupts, but I'm guessing you like the hardware implementation.