Re: [Zephyr-users] Buggy PWM driver for nRF52

Marti Bolivar

Hi Vikrant,

Are you using the latest master?

Three improvements to nRF PWM went in fairly recently:

3f1dbfda1 pwm: nrf5_sw: don't disable timer if another channel is still active
ab399a1cf pwm: nrf5_sw: do not use 'inversed' polarity by default
cec073c35 pwm: nrf5_sw: add support for SYS_LOG


On Wed, Feb 7, 2018 at 1:59 PM, Vikrant More <vikrant8051@...> wrote:
I took reference of $zephy/samples/samples/fade_led project

& add following parameters in my prj.conf


Could you please inform me, what I should do besides this ??

Thank You !!

On Feb 7, 2018 11:36 PM, "Felipe Neves" <ryukokki.felipe@...> wrote:
Hi Vikrant,

Did you configure what pins are associated to pwm duty_cycles on the menuconfig?



2018-02-07 10:15 GMT-02:00 Vikrant More <vikrant8051@...>:
Hello World !!

I've added following lines in my project main ()

    pwm_dev = device_get_binding(PWM_DRIVER);

    if (!pwm_dev)
        printk("Cannot find %s!\n", PWM_DRIVER);

        if(pwm_pin_set_usec(pwm_dev, PWM_CHANNEL0, PERIOD, pulse_width0))
            printk("pwm pin set fails\n");

        if(pwm_pin_set_usec(pwm_dev, PWM_CHANNEL1, PERIOD, pulse_width1))
            printk("pwm pin set fails\n");


And using bluetooth updating value of pulse_width0 & pulse_width1. Those two are defined as global variables.

pulse_width0 --> LED_1 on nrf52840_PDK
pulse_width1 --> LED_2 on nrf52840_PDK

I'm able to update value of both these variables using Bluetooth.
I used printk to check it. My logic is perfect.

But if I vary pulse_width0 then it affects intensity of LED2
& if I vary pulse_width1 then it affects intensity of LED1.

Why ? Is anyone found this BUG ?

Zephyr-users mailing list

Felipe S. Neves 
Embedded software & systems engineer
Skype: fneves1989

Zephyr-users mailing list

Join { to automatically receive all group messages.