60 lines
2.5 KiB
ReStructuredText
60 lines
2.5 KiB
ReStructuredText
.. _nrfx_prs_sample:
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nrfx peripheral resource sharing example
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########################################
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Overview
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********
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This sample shows how to use in Zephyr nRF perpipherals that share the same ID
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and base address. Such peripherals cannot be used simultaneously because they
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share certain hardware resources, but it is possible to switch between them and
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use one or the other alternately. Because of the current driver model in Zephyr
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and the lack of possibility to deinitialize a peripheral that is initialized by
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a driver at boot, such switching cannot be achieved with Zephyr APIs. Therefore,
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this sample uses the nrfx drivers directly for those peripheral instances that
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are to be switched (SPIM2 and UARTE2) while the standard Zephyr drivers are used
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for other instances of the same peripheral types (UARTE0 is used by the standard
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Zephyr console and SPIM1 is used for performing additional sample transfers).
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The sample uses two buttons:
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- by pressing Button 1 user can request a transfer to be performed using the
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currently initialized peripheral (SPIM2 or UARTE2)
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- by pressing Button 2 user can switch between the two peripherals
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When no button is pressed, every 5 seconds a background transfer using SPIM1
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is performed.
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The sample outputs on the standard console the hex codes of all sent and
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received bytes, so when the proper loopback wiring is provided on the used
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board (between the MOSI and MISO pins for SPIMs and between the TX and RX pins
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for the UARTE), it can be checked that what is sent by a given peripheral
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is also received back. Without such wiring, no data is received by UARTE and
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all zeros are received by SPIMs. Refer to the overlay files provided in the
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:zephyr_file:`samples/boards/nrf/nrfx_prs/boards` directory to check which pins
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on the boards supported by the sample are assigned as MOSI/MISO and TX/RX pins.
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Requirements
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************
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This sample has been tested on the Nordic Semiconductor nRF9160 DK
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(nrf9160dk_nrf9160) and nRF5340 DK (nrf5340dk_nrf5340_cpuapp) boards.
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Building and Running
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********************
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The code can be found in :zephyr_file:`samples/boards/nrf/nrfx_prs`.
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To build and flash the application:
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.. zephyr-app-commands::
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:zephyr-app: samples/boards/nrf/nrfx_prs
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:board: nrf9160dk_nrf9160
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:goals: build flash
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:compact:
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Press Button 1 to trigger a sample transfer on SPIM2 or UARTE2.
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Press Button 2 to switch the type of peripheral to be used for the transfer.
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When no button is pressed, a background transfer on SPIM1 is performed.
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