dimming continuously using pwm library

RE: dimming continuously using pwm library

Edvin — Thu, 27 Sep 2018 08:09:40 GMT

I suggest you take a look at demo2() in examples\peripheral\pwm_driver\

This example has some different demos. demo1() uses the CPU every time it changes intencity (demo1_handler()), demo 2 is only initialized and started with a loop flag.

Note that demo2() has two different sequences played after one another. First, in seq0 the LEDs will dim from off to on, and then seq1 will blink the LEDs.

As you see, if you don't want any CPU interrupts (so that it is not blocking other tasks), you must set all the variables in an array (seq0_values[]).

Note that it is possible to slowly dim without blocking, using the solution that awneil suggested. But then you need to use the CPU every time you want to update the duty cycle. In the PWM driver example, the PWM peripheral can change duty cycles without interrupting the CPU.

You can read about the PWM peripheral here.

Best regards,

Edvin

RE: dimming continuously using pwm library

sophieyellow — Thu, 27 Sep 2018 07:32:09 GMT

Thank you for your help. However I would like it to have a smooth transition to next luminous level, do you know how to achieve that?

RE: dimming continuously using pwm library

awneil — Mon, 24 Sep 2018 11:04:56 GMT

[quote userid="73894" url="~/f/nordic-q-a/38818/dimming-continuously-using-pwm-library"]could you give me the guideline to achieve the task? [/quote]

Use the PWM driver?

See: https://devzone.nordicsemi.com/f/nordic-q-a/38607/nrf5-sdk15-0---pwm-driver-just-set-a-fixed-duty-cycle