RE: PPI resources used by S140

Håkon Alseth — Tue, 26 Mar 2019 13:04:42 GMT

Hi,

In order to see what PPI channels that are used by the softdevice, you should look at this define:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s112.api.v6.1.0/group___n_r_f___s_o_c___d_e_f_i_n_e_s.html#ga2274cc200928311ce80bf8c9cc79b990

The group itself is also defined underneath.

The PPI channels from 20 to 31 are the pre-defined ones:

http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52840.ps/ppi.html?cp=2_0_0_5_15_0#preprogrammed_channels

[quote user=""]And, is it correct that it is not possible to configure the PPI directly when the SoftDevice is present and that all configuration need to be performed through the SD-API defined in nrf_soc.h? At the present we are using the direct assignement through nrf_drv_ppi_channel_assign etc. and do not experience any problems even though we have SD and BLE present and working. My understanding is that the SD should block the access to this peripheral and demand access through its API. Is there something I've missed?[/quote]

The PPI peripheral can be configured directly in the application. In the very first versions of the SoftDevice (for nRF51 series), there was an API for using the PPI, but now you can access it directly on a register level.

If you try to access (ie: write) to a peripheral which the softdevice controls, like the radio, it will cause a fault condition.

Kind regards,

Håkon