NRF_ERROR_NO_MEM when initializing second PWM instance

[Luis]

Hello, I am getting NRF_ERROR_NO_MEM when initializing second PWM instance, I tried to find the reason, but no luck. Please help.

I am using nRF51822 with SDK9 (+fixed pwm library from sdk10).

First two easy questions that I found contradictory answers using the search:

- When using SD130, do we have 8 free ppi channels (like is said here on august devzone.nordicsemi.com/.../) or 14 (like is written on s130 specification from june)?

- Should we initialize PWM (and enable it) before or after Softdevice initialization?

Now the real question:

- Why am I getting the NRF_ERROR_NO_MEM error when initializing second instance of pwm library?

I guess it is because I am running out of free ppi or gpiote channels, but I don't know why. First PWM instance only uses 6 ppi channels (2 channel pwm). My app is also using: TWI, BSP (only leds not buttons), APP TIMERS, SCHEDULER, ADC... NUS SERVICE, SCAN, ADVERTISING, CONNECTION... and that's all I think. Do any of these things use any ppi or gpiote channel by default?

Thank you very much for your help and time,

Luis Rodenas

[Ole Bauck]

For the first questions:

• SD130 v1.0.0 has 14 PPI channels available for the application, see here.

• You can initialize the PWM before or after the SoftDevice initialization, it doesn't matter.

For your problem, it is with the PPI channels. SDK 9 include headers for previous SD130 which only allowed 8 PPI channels for the application. Replace the headers in components/softdevice/S130/headers/ with the ones from SDK 10.

[Luis]

That fixed it! Thank you very much for great and fast support. I would recommend that you expand documentation on infocenter about PWM library, so people know they have to use sdk10 headers in order to use two instances.

[Ole Bauck]

No problem. I will make sure we update the information.