Time delay

[nbyte]

Hi nRF support team,

What do I need to do if I want to use the precise delay of NS, now the delay error is very large.

thanks

[nbyte]

Hi,Torbjørn

Thank you for your reply

1.I tested the clock at 32M and the exception did not improve.

2.Is there such a variable cycle PWM driver routine？

 Looking forward to your reply

[ovrebekk]

Hi 

2. Yes, please read the Decoder with EasyDMA chapter available here. 

Essentially, when you set the DECODER.LOAD mode to WaveForm, you can have the PWM interval/frequency updated dynamically based on values in RAM. 

Values 0, 1 and 2 in the PWM buffer will set the duty cycle for up to 3 GPIO outputs, while value 3 sets the common countertop value for the three output channels. The PWM frequency is defined by the PWM base frequency (configurable through the PRESCALER register) divided by the countertop value, and in this mode you can have the frequency change for every single pulse. 

For an example of how to use the nrfx_pwm driver in NCS you can have a look at this example. 

It doesn't use the WaveForm LOAD setting, but you can change the example to test this out. 

Best regards
Torbjørn

[nbyte]

Hi,Torbjørn

Thank you for your reply

I'm going to test it out

thank you very much

[ovrebekk]

Hi 

Good luck. If you have any issues with it just let me know

Best regards
Torbjørn

[nbyte]

Hi,

Torbjørn

thank you very much