How to have 3 PWMs by using app_pwm.c ?

[Sam Lin]

Hi All,

I want to have 3 PWMs by using app_pwm.c lib (in SDK 9.0.0). But from doc each instance takes 2 ppi plus 2 plus per channel.

Means 3 PWMS needs 2 instances.

first instance: 2 + 2 x 2 = 6 2nd instacne: 2+ 2 x 1 = 4

so when i init 2nd PWM instance I got NO_MEM error.

Any good idea about this ?

[Stefan Birnir Sverrisson]

Hi Sam

The application can use PPI channels 0-13 when using S110, because the S110 reserves PPI channels 14-31 when enabled, see S110 Softdevice Specification 2.0, section 11.5. If you have no softdevice enabled than you can use PPI channels 0-15 for the application.

[cnchen]

Hi, a simple follow-up. so there is no other way to use 3 PWMs when SoftDevice is enabled? (Except the hack provided by Lin above)