drivers: serial: nrfx_uarte: Add extension that uses TIMER byte counting on nrf54x devices #92767
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@nordic-krch still relevant? needs a rebase |
Timer property indicates which TIMER instance should be used for byte counting. If timer property is present then given instance is using TIMER to count received bytes. Signed-off-by: Krzysztof Chruściński <[email protected]>
Rearrange code to prepare for upcoming extension that adds special receive mode. Signed-off-by: Krzysztof Chruściński <[email protected]>
Add mode to be used on UARTE with frame timeout which is using a bounce buffers and TIMER to count bytes. This mode shall be used to reliably receive data without HWFC as frame timeout approach is not 100% reliable because it can loose or corrupt a byte when new byte arrives after frame timeout is detected but before it is fully handled. This mode is similar to the one enabled with CONFIG_UART_x_NRF_HW_ASYNC but additional bounce buffers are used and UARTE is receiving data to internal buffers and copies data to the user buffer. Legacy apporach cannot be used because in new SoC DMA attempts to copy data in words so when byte is received it stays in the DMA internal buffer until 4 bytes are received or end of transfer happens then internal DMA buffer is flushed. Signed-off-by: Krzysztof Chruściński <[email protected]>
Add reporting about the test progress. Test lasts few seconds and progress report helps to see if test stuck or how it is progressing. Signed-off-by: Krzysztof Chruściński <[email protected]>
Extend test with a mode where HWFC is off and receiver is providing buffers on time. In that case receiver should be able to continuously receive data without losing any byte (even without HWFC). Additionally, TX data is chopped to verify that receiver does not loose bytes when new TX data collides with detected RX timeout. Signed-off-by: Krzysztof Chruściński <[email protected]>
Add timer property to the uart device under test. Add zephyr,pm-device-runtime-auto to the uart device under test. Signed-off-by: Krzysztof Chruściński <[email protected]>
Add workaround timer to instances that are used for reception in the test. Signed-off-by: Krzysztof Chruściński <[email protected]>
Stress test is executed on CPUs with slow clock (16MHz). Handling of test data in UART_RX_RDY event is optimized to reduce time spent in the interrupt context. Since payload is always a decrementing sequence, fixed array is used to compare memory which allows to use standard memcmp instead of byte by byte comparison. Signed-off-by: Krzysztof Chruściński <[email protected]>
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bjarki-andreasen
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Oct 23, 2025
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Extend uart_nrfx_uarte driver to support a mode of operation that is using bounce buffers and TIMER to count bytes (only applies to Asynchronous API). UARTE may lose or get a corrupted byte if new data appears on the line when RX timeout expired. In that case receiver is restarted and if there is a byte on the line when that restart happens then that byte will be lost or corrupted. This is relevant only to reception without HWFC.
Mode is using a TIMER instance and DPPI to count bytes using UARTE RXDRDY event. There is already a similar mode that is enabled using
CONFIG_UART_x_NRF_HW_ASYNCfor legacy platforms but it cannot be used on newer SoCs due to different DMA behavior.New mode is enabled by specifying a
timerproperty which points to the TIMER instance (e.g..timer = <&timer21>). Timer node that is used for that should be reserved.Overlay example:
PR extends
uart_async_dualstress test with a case which validates that the receiver is able to received chopped data (data sent in chunks with random gaps between).