example code to reset timer when radio pipe address matched?

[Andrew Kohlsmith]

Good evening,

I'm trying to understand how to use the SDK 12 to connect peripherals using PPI such that when an address match occurs (say on pipe 1's address+prefix), a timer is reset.

I'm struggling to understand how to set this up. I'm not using a softdevice, but am using the Gazell library with nrf51822 and SDK 12.2.

Ideally, I'd like to then use another PPI channel to capture that timer's value when a SPI transaction occurs, but one step at a time.

Could you help me find code which shows how to set something like this up?

[haakonsh]

Hey Andrew,

You need to connect the RADIO's EVENTS_DEVMATCH event with a TIMER's TASKS_CLEAR task, and one of the SPI's events with the TIMER's TASKS_CAPTURE task. 

I need you to open up the PPI example in SDK14.2/examples/peripheral/ppi and learn how to setup TIMERs with PPI.

Each peripheral driver has functions called nrf_drv_<peripheral>_task_address_get() and nrf_drv_<peripheral>_event_address_get(). They are used to get the address of a specific task or event who are in turn passed to the nrf_drv_ppi_channel_assign(&yourChannel, taskAdress, eventAddress) function. Now you need to enable the given channel with nrf_drv_ppi_channel_enable(yourChannel) and the given event is now connected to the given task. 

Cheers,

Håkon.