The nrfx_ppi source code is defined in $(SDK_ROOT)modules/nrfx/drivers/src/nrfx_ppi.c and the header nrfx_ppi.h is located at $(SDK_ROOT)/modules/nrfx/drivers/include. Include the nrfx_ppi driver in your project In this section, you will learn how to include the nrfx_driver in your project and enable PPI module in your project’s configuration. To control PPI, you use the driver nrfx_ppi in nRF5 SDK.

This will allow en event to trigger two tasks simultaneously. PPI Task End Point (TEP) and Fork Task End Point (Fork TEP)Įach PPI channel has two task end points (TEP and Fork TEP). EEP is a register that contains the address of the peripheral’s event register. PPI Event End Point (EEP)Įach PPI channel has one Event End Point (EEP) which you can connect a peripheral’s event to. However, you can only enable or disable a fixed PPI channel, because its connections are fixed. You can choose which peripherals to connect to configurable PPI channels. Of those, 20 channels (from 0 to 19) are configurable and 12 channels (from 20 to 31) are fixed. There are 32 PPI channels that are available to use. That configuration will allow the LED to blink every 500 ms with no CPU involvement. You can connect TIMER’s event to one end of a PPI channel, and GPIOTE’s task to the other end of the same PPI channel. Whenever TIMER expires, the GPIO pin is toggled so that the LED blinks. Peripheral 2 might be a GPIOTE module which controls a GPIO pin connected to an LED. For example, peripheral 1 might be a TIMER peripheral which generates an event every 500 ms. You can use PPI in applications where if peripheral 1 finishes some jobs and you expect peripheral 2 to be automatically notified and triggers an action. Each PPI module contains 32 channels (32 “wires”) that you can use. Configurable means you can choose which peripheral to connect at one end, and which peripheral to connect at the other end. You can imagine PPI module as configurable wires that connect two peripherals.

As the name suggests, PPI module allows two peripherals to communicate with each other without CPU intervention as illustrated below Peripheral 1 -> PPI module -> Peripheral 2 PPI stands for Programmable Peripheral Interconnect. Adafruit Feather nRF52 Bluefruit LE – nRF52832Īffiliate Disclosure: When you click on links in this section and make a purchase, this may result in this site earning a commission at no extra cost to you.To compile and run your code on real nRF52 hardware, it is recommended that you have a nRF52 development kit such as What are common PPI APIs in nrfx_ppi driver.How to include and enable nrfx_ppi driver in your project.

PPI terminologies: tasks, events, channels.What is PPI and why it might be useful for your project.In this article, you will learn about the PPI module in Nordic nRF52 and how to use nrfx_ppi driver to interact with it.

Nrf52 totem pole output