60 lines
2.5 KiB
ReStructuredText
60 lines
2.5 KiB
ReStructuredText
.. zephyr:code-sample:: nrf_nrfx_prs
|
|
:name: nrfx peripheral resource sharing
|
|
|
|
Use nRF peripherals that share the same ID and base address.
|
|
|
|
Overview
|
|
********
|
|
|
|
This sample shows how to use in Zephyr nRF peripherals that share the same ID
|
|
and base address. Such peripherals cannot be used simultaneously because they
|
|
share certain hardware resources, but it is possible to switch between them and
|
|
use one or the other alternately. Because of the current driver model in Zephyr
|
|
and the lack of possibility to deinitialize a peripheral that is initialized by
|
|
a driver at boot, such switching cannot be achieved with Zephyr APIs. Therefore,
|
|
this sample uses the nrfx drivers directly for those peripheral instances that
|
|
are to be switched (SPIM2 and UARTE2) while the standard Zephyr drivers are used
|
|
for other instances of the same peripheral types (UARTE0 is used by the standard
|
|
Zephyr console and SPIM1 is used for performing additional sample transfers).
|
|
|
|
The sample uses two buttons:
|
|
- by pressing Button 1 user can request a transfer to be performed using the
|
|
currently initialized peripheral (SPIM2 or UARTE2)
|
|
- by pressing Button 2 user can switch between the two peripherals
|
|
|
|
When no button is pressed, every 5 seconds a background transfer using SPIM1
|
|
is performed.
|
|
|
|
The sample outputs on the standard console the hex codes of all sent and
|
|
received bytes, so when the proper loopback wiring is provided on the used
|
|
board (between the MOSI and MISO pins for SPIMs and between the TX and RX pins
|
|
for the UARTE), it can be checked that what is sent by a given peripheral
|
|
is also received back. Without such wiring, no data is received by UARTE and
|
|
all zeros are received by SPIMs. Refer to the overlay files provided in the
|
|
:zephyr_file:`samples/boards/nordic/nrfx_prs/boards` directory to check which pins
|
|
on the boards supported by the sample are assigned as MOSI/MISO and TX/RX pins.
|
|
|
|
Requirements
|
|
************
|
|
|
|
This sample has been tested on the Nordic Semiconductor nRF9160 DK
|
|
(nrf9160dk/nrf9160) and nRF5340 DK (nrf5340dk/nrf5340/cpuapp) boards.
|
|
|
|
Building and Running
|
|
********************
|
|
|
|
The code can be found in :zephyr_file:`samples/boards/nordic/nrfx_prs`.
|
|
|
|
To build and flash the application:
|
|
|
|
.. zephyr-app-commands::
|
|
:zephyr-app: samples/boards/nordic/nrfx_prs
|
|
:board: nrf9160dk/nrf9160
|
|
:goals: build flash
|
|
:compact:
|
|
|
|
Press Button 1 to trigger a sample transfer on SPIM2 or UARTE2.
|
|
Press Button 2 to switch the type of peripheral to be used for the transfer.
|
|
|
|
When no button is pressed, a background transfer on SPIM1 is performed.
|