PWM frequency repeater

[ArtG89]

Hi, 

I have a task to do PWM frequency repeater on nrf52832. After reading forums I decided to make it with PPI, 2 GPIOTE and 3 Timers. Here what I did: https://github.com/ArtG89/nrf52832_ppi/tree/master/Application

But there are 2 problems:

1. When I want to measure and change frequency quicker than 1 Hz (for example 1 time per 200 ms) (change PPI_PWM_IN_MEASURE_TIME_PRESCALER in ppi_pwm_in_driver.h to 5) - pwm out doesn't work.

2. PWM out randomly shuts down on hi or low level when I quickly change input frequency (even when measured 1 time per second).

What I did wrong? In debug mode timer for pwm out shows correct cc[0].

I only need to repeat frequency not duty.

Thanks in advance.

[FormerMember]

I'm testing the code here, but I to come back to the testing on Monday.

Is there a specific reason why you generate the PWM signal using PPI and GPIOTE? If not, I would recommend you to use the PWM peripheral instead, it is a lot easier to use. As a starting point, you can use the pwm_driver example. 

[ArtG89]

In my email, there is message, that You don't see any toggling on pin 6 nor pin 8, even with the prescaler set to '1'. I use my own board with these pins not nrf52-dk (on nrf52-dk these pins used for something else, as I remember uart), on nrf52-dk I'd tried pins 30 and 31. Please inform when You can run my code. One pin is input for measure pwm, and other is output pwm.

[FormerMember]

When I test here, the frequency on PPI_PWM_OUT_PIN never changes because the measured frequency in ppi_pwm_in_measured_freq() always is '0' (the value of PPI_PWM_IN_COUNTER->CC[0] is always '0').

[ArtG89]

Yes, it needs  external signal from signal generator or other board.