NRF52 PWM library or driver?

RE: NRF52 PWM library or driver?

haakonsh — Mon, 20 Apr 2020 08:42:01 GMT

Can you show me the relevant code?

FYI, if you're using the LED's on the DK remember that they are active low.

RE: NRF52 PWM library or driver?

haakonsh — Mon, 20 Apr 2020 08:37:03 GMT

Try this, open cmd, type: nrfjprog -f nrf52 --recover --log

Send me the log file that is generated.

RE: NRF52 PWM library or driver?

marian_g — Sun, 19 Apr 2020 16:30:10 GMT

it's my third chip which is broken after flashing the softdevice v7.0.1.

I am flashing using j-link via swd interface. can you check this on your side please?

RE: NRF52 PWM library or driver?

marian_g — Fri, 17 Apr 2020 17:14:02 GMT

One more question regarding the PWM driver and PWM driver example:

Is there a way to change the polarity of the pin?

I am using BSP_LED_0 | NRF_DRV_PWM_PIN_INVERTED and also just BSP_LED_0 with the same effect, the pin is LOW until reaches the COMP value, then goes HIGH until TOP.

The pin is working correctly if i use the PWM_Libary example.

Thanks

RE: NRF52 PWM library or driver?

marian_g — Fri, 17 Apr 2020 13:37:02 GMT

Hello,

I started with the PWM driver library and i run into a problem. I flashed the softdevice S132 v7 in the chip, then i tried to flash the PWM driver PCA10040 example.

The flashing didn't work and my chip stopped responding.

I couldn't reflash, erase, do anything on that chip.

I am using J-Link to flash, over SWD interface

Is there a reason why this is braking my chips?

RE: NRF52 PWM library or driver?

haakonsh — Fri, 17 Apr 2020 11:15:13 GMT

I recommend that you use the UARTE peripheral with the UARTE driver. I also recommend using HW flow control.

Though if you're gonna connect to a PC via uart-USB bridge you might as well just use the nRF52840 with integrated USB. We've got a USB CDC ACM Example (Virtual COM port) that should work with any PC out of the box.

RE: NRF52 PWM library or driver?

marian_g — Thu, 16 Apr 2020 14:55:05 GMT

Thank you very much for your fast response.

I will continue my application using the driver, like you advised me. After you advanced with reading the documentation and also taking a closer look in the example, doesn't look too hard after all.

Can you also help me choose an example for UART communication?

I would like to have serial communication with the PC using an SIL2104 module.

RE: NRF52 PWM library or driver?

haakonsh — Thu, 16 Apr 2020 14:11:09 GMT

The PWM library uses a TIMER and GPIOTE to create a PWM signal. It is vulnerable to polarity inversions so I recommend that you stick with the PWM peripheral, see the PWM driver example for details.

The PWM peripheral might be a bit overkill for your application, but it is safe from polarity inversions.