When running a BLE stack how many PPI channels are available to me and does it stay fixed?
You will have 8 PPI channels available to your application when the S110 is enabled (BLE Stack is running.) If you disable the SoftDevice, all 16 channels are avaliable to your application.
These details are given in the S110 SoftDevice specification.
I'm looking at the linked specification (version 2.0) right now, and it says that the application can use channels 0-13. Has the SoftDevice S110 implementation changed? We get 14 channels now instead of the previous 8?