NRF52 PWM library or driver?

[marian_g]

Hello,

I am trying to build a remote control using NRF52832 SoC, SDK16.0.0 with softdevice S132 version 7, Keil 5.

I have to control a servo motor and i want to achieve this using the PWM HW integrated in the chip.

I am also using the softdevice S132.

Should i start with the examples from the PWM Library? or the ones from PWM driver?

The examples from PWM driver looks very complicated compared to the task that i have.

I also searched about servo examples using nrf52, but i didn't found a simple example which is working.

Is there a way to directly update the Compare register from the Timer with the calculated value in order to control the servo?

Thank you!

[haakonsh]

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. 

[marian_g]

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.

[haakonsh]

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. 

[marian_g]

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?

[marian_g]

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?

[haakonsh]

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

Send me the log file that is generated.