PWM jitter when setting duty cycle to .2 .4 .6 .8

RE: PWM jitter when setting duty cycle to .2 .4 .6 .8

Ole Bauck — Tue, 24 Jan 2017 09:41:02 GMT

Mbed has its own sdk. It may be based on one of nordics SDKs, but at least the pwmout library is written specially for mbed and not based on the SDK PWM library. Here is the source code for the pwmout library which is different from the one used in our SDK. I would use the SDK instead of mbed. You can also switch to nrf52. The nrf52 does not have problem with jittering as it has a hardware PWM peripheral.

RE: PWM jitter when setting duty cycle to .2 .4 .6 .8

Gillgen1 — Mon, 23 Jan 2017 20:18:01 GMT

Ole, thank you for your response. You are correct I am using mbed for preliminary testing, and I thought I was using sdk11 which should have all the issues corrected. How would I check that on mbed platform

RE: PWM jitter when setting duty cycle to .2 .4 .6 .8

Ole Bauck — Mon, 23 Jan 2017 12:41:04 GMT

This is mbed right (looks like c++ code at least)? Earlier PWM libraries (including mbed) had a problem with glitching PWM if used together with BLE. You should use the PWM library from SDK 10 and later, these are fixed and don't have the glitching problem when used together with BLE.

RE: PWM jitter when setting duty cycle to .2 .4 .6 .8

Roger Clark — Sun, 22 Jan 2017 04:42:04 GMT

10mS is 10/1000 of a second = 1/100 th second = 100Hz

(Can't help with the other part of your question)