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tests: drivers: uart: Add UART mode to mode full duplex transmission test
This test suite verifies data transmission between two UART instances operating in different modes (ASYNC, INT, POLL). Signed-off-by: Bartosz Miller <bartosz.miller@nordicsemi.no>
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‎tests/drivers/uart/uart_mixed_modes/CMakeLists.txt‎

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#
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# Copyright (c) 2025 Nordic Semiconductor ASA
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#
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# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
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#
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cmake_minimum_required(VERSION 3.20.0)
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find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
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project(uart_mode_to_mode)
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if(CONFIG_ASYNC_TO_INT)
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FILE(GLOB app_sources src/async_int.c)
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elseif(CONFIG_ASYNC_TO_POLL)
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FILE(GLOB app_sources src/async_poll.c)
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else()
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FILE(GLOB app_sources src/int_poll.c)
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endif()
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target_sources(app PRIVATE src/common.c ${app_sources})

‎tests/drivers/uart/uart_mixed_modes/Kconfig‎

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#
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# Copyright (c) 2025 Nordic Semiconductor ASA
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#
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# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
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#
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source "Kconfig.zephyr"
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config ASYNC_TO_INT
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bool "Enable async to int mode uart transmission test"
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config ASYNC_TO_POLL
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bool "Enable async to poll mode uart transmission test"
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config INT_TO_POLL
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bool "Enable int to poll mode uart transmission test"

‎tests/drivers/uart/uart_mixed_modes/boards/nrf54h20dk_nrf54h20_cpuapp.overlay‎

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/*
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* Copyright (c) 2025 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
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*/
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/*
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* Required loopbacks:
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* P0.08 <-> P0.09
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* P0.06 <-> P0.07
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*/
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&pinctrl {
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uart134_default_test: uart134_default_test {
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group1 {
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psels = <NRF_PSEL(UART_RX, 0, 9)>;
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bias-pull-up;
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};
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group2 {
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psels = <NRF_PSEL(UART_TX, 0, 6)>;
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};
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};
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uart134_sleep_test: uart134_sleep_test {
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group1 {
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psels = <NRF_PSEL(UART_TX, 0, 6)>,
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<NRF_PSEL(UART_RX, 0, 9)>;
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low-power-enable;
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};
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};
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uart131_default_test: uart131_default_test {
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group1 {
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psels = <NRF_PSEL(UART_RX, 0, 7)>;
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bias-pull-up;
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};
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group2 {
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psels = <NRF_PSEL(UART_TX, 0, 8)>;
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};
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};
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uart131_sleep_test: uart131_sleep_test {
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group1 {
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psels = <NRF_PSEL(UART_TX, 0, 7)>,
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<NRF_PSEL(UART_RX, 0, 8)>;
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low-power-enable;
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};
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};
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};
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&cpuapp_dma_region {
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status = "okay";
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};
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dut_uart_a: &uart134 {
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compatible = "nordic,nrf-uarte";
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current-speed = <115200>;
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status = "okay";
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memory-regions = <&cpuapp_dma_region>;
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pinctrl-0 = <&uart134_default_test>;
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pinctrl-1 = <&uart134_sleep_test>;
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pinctrl-names = "default", "sleep";
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/delete-property/ hw-flow-control;
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};
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dut_uart_b: &uart131 {
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compatible = "nordic,nrf-uarte";
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current-speed = <115200>;
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status = "okay";
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memory-regions = <&cpuapp_dma_region>;
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pinctrl-0 = <&uart131_default_test>;
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pinctrl-1 = <&uart131_sleep_test>;
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pinctrl-names = "default", "sleep";
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/delete-property/ hw-flow-control;
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};
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‎tests/drivers/uart/uart_mixed_modes/boards/nrf54l15dk_nrf54l15_cpuapp.overlay‎

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/*
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* Copyright (c) 2025 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
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*/
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/*
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* Required loopbacks:
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* P1.08 <-> P1.09
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* P1.10 <-> P1.11
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*/
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&pinctrl {
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uart21_default: uart21_default {
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group1 {
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psels = <NRF_PSEL(UART_TX, 1, 10)>,
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<NRF_PSEL(UART_RX, 1, 8)>;
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bias-pull-up;
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};
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};
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uart21_sleep: uart21_sleep {
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group1 {
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psels = <NRF_PSEL(UART_TX, 1, 10)>,
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<NRF_PSEL(UART_RX, 1, 8)>;
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low-power-enable;
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};
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};
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uart22_default: uart22_default {
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group1 {
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psels = <NRF_PSEL(UART_TX, 1, 9)>,
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<NRF_PSEL(UART_RX, 1, 11)>;
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bias-pull-up;
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};
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};
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uart22_sleep: uart22_sleep {
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group1 {
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psels = <NRF_PSEL(UART_TX, 1, 9)>,
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<NRF_PSEL(UART_RX, 1, 11)>;
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low-power-enable;
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};
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};
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};
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dut_uart_a: &uart21 {
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status = "okay";
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current-speed = <115200>;
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pinctrl-0 = <&uart21_default>;
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pinctrl-1 = <&uart21_sleep>;
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pinctrl-names = "default", "sleep";
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};
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dut_uart_b: &uart22 {
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status = "okay";
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current-speed = <115200>;
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pinctrl-0 = <&uart22_default>;
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pinctrl-1 = <&uart22_sleep>;
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pinctrl-names = "default", "sleep";
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};

‎tests/drivers/uart/uart_mixed_modes/boards/nrf54lm20dk_nrf54lm20a_cpuapp.overlay‎

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/*
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* Copyright (c) 2025 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
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*/
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/*
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* Required loopbacks:
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* P1.13 <-> P1.13
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* P1.23 <-> P1.24
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*/
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&pinctrl {
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uart21_default: uart21_default {
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group1 {
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psels = <NRF_PSEL(UART_TX, 1, 13)>,
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<NRF_PSEL(UART_RX, 1, 23)>;
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bias-pull-up;
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};
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};
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uart21_sleep: uart21_sleep {
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group1 {
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psels = <NRF_PSEL(UART_TX, 1, 13)>,
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<NRF_PSEL(UART_RX, 1, 23)>;
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low-power-enable;
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};
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};
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uart22_default: uart22_default {
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group1 {
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psels = <NRF_PSEL(UART_TX, 1, 24)>,
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<NRF_PSEL(UART_RX, 1, 14)>;
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bias-pull-up;
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};
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};
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uart22_sleep: uart22_sleep {
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group1 {
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psels = <NRF_PSEL(UART_TX, 1, 24)>,
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<NRF_PSEL(UART_RX, 1, 14)>;
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low-power-enable;
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};
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};
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};
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dut_uart_a: &uart21 {
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status = "okay";
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current-speed = <115200>;
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pinctrl-0 = <&uart21_default>;
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pinctrl-1 = <&uart21_sleep>;
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pinctrl-names = "default", "sleep";
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};
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dut_uart_b: &uart22 {
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status = "okay";
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current-speed = <115200>;
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pinctrl-0 = <&uart22_default>;
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pinctrl-1 = <&uart22_sleep>;
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pinctrl-names = "default", "sleep";
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};

‎tests/drivers/uart/uart_mixed_modes/prj.conf‎

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CONFIG_SERIAL=y
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CONFIG_UART_USE_RUNTIME_CONFIGURE=y
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CONFIG_ZTEST=y

‎tests/drivers/uart/uart_mixed_modes/src/async_int.c‎

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/*
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* Copyright (c) 2025 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
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*/
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#include "common.h"
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const struct device *const uart_dev_async_mode = DEVICE_DT_GET(UART_NODE_MODE_A);
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const struct device *const uart_dev_int_mode = DEVICE_DT_GET(UART_NODE_MODE_B);
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extern struct k_sem uart_async_mode_rx_ready_sem;
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extern struct k_sem uart_interrupt_mode_rx_done_sem;
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extern uint8_t uart_a_tx_test_buffer[BUFFER_SIZE];
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extern uint8_t uart_a_rx_test_buffer[BUFFER_SIZE];
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extern uint8_t uart_b_tx_test_buffer[BUFFER_SIZE];
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extern uint8_t uart_b_rx_test_buffer[BUFFER_SIZE];
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extern volatile uint32_t tx_byte_offset;
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extern volatile uint32_t rx_byte_offset;
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ZTEST(uart_async_int, test_uart_async_int_transmission)
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{
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int err, rx_done_async_sem_take_result, rx_done_int_sem_take_result;
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uint32_t sleep_time_ms = 0;
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uart_test_data uart_async_test_data;
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uart_test_data uart_int_test_data;
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tx_byte_offset = 0;
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rx_byte_offset = 0;
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uart_async_test_data.tx_buffer = uart_a_tx_test_buffer;
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uart_async_test_data.rx_buffer = uart_a_rx_test_buffer;
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uart_async_test_data.buffer_size = BUFFER_SIZE;
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uart_int_test_data.tx_buffer = uart_b_tx_test_buffer;
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uart_int_test_data.rx_buffer = uart_b_rx_test_buffer;
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uart_int_test_data.buffer_size = BUFFER_SIZE;
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set_test_pattern(&uart_async_test_data);
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set_test_pattern(&uart_int_test_data);
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TC_PRINT("UART full duplex transmission test: UART (ASYNC) <-> UART (INT)\n");
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err = uart_callback_set(uart_dev_async_mode, async_uart_callback, NULL);
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zassert_equal(err, 0, "ASYNC UART callback setup failed");
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err = uart_irq_callback_set(uart_dev_int_mode, uart_isr_handler);
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zassert_equal(err, 0, "Unexpected error when setting callback for INT UART: %d", err);
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err = uart_irq_callback_user_data_set(uart_dev_int_mode, uart_isr_handler,
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(void *)&uart_int_test_data);
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zassert_equal(err, 0,
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"Unexpected error when setting user data for callback for INT UART: %d", err);
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TC_PRINT("Starting transmission\n");
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enable_uart_rx(uart_dev_async_mode, &uart_async_test_data);
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uart_irq_rx_enable(uart_dev_int_mode);
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uart_irq_tx_enable(uart_dev_int_mode);
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err = uart_tx(uart_dev_async_mode, uart_async_test_data.tx_buffer, BUFFER_SIZE,
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UART_TIMEOUT_US);
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TC_PRINT("Waiting for transmission to finish\n");
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while (1) {
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rx_done_async_sem_take_result =
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k_sem_take(&uart_async_mode_rx_ready_sem, K_NO_WAIT);
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rx_done_int_sem_take_result =
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k_sem_take(&uart_interrupt_mode_rx_done_sem, K_NO_WAIT);
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if ((rx_done_async_sem_take_result + rx_done_int_sem_take_result) == 0) {
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TC_PRINT("Full duplex transmission completed\n");
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break;
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}
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k_msleep(SEM_CHECK_DEAD_TIME_MS);
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sleep_time_ms += SEM_CHECK_DEAD_TIME_MS;
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zassert_true(sleep_time_ms < TRANSMISSION_TIMEOUT_MS, "Transmission timed out\n");
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}
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uart_rx_disable(uart_dev_async_mode);
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uart_irq_rx_disable(uart_dev_int_mode);
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uart_irq_tx_disable(uart_dev_int_mode);
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zassert_mem_equal(uart_async_test_data.rx_buffer, uart_int_test_data.rx_buffer, BUFFER_SIZE,
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"UART (ASYNC) RX buffer != UART (INT) RX buffer\n");
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}
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void *test_setup(void)
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{
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zassert_true(device_is_ready(uart_dev_async_mode), "UART in ASYNC mode is not ready");
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zassert_true(device_is_ready(uart_dev_int_mode), "UART in INTERRUPT mode is not ready");
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return NULL;
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}
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ZTEST_SUITE(uart_async_int, NULL, test_setup, NULL, NULL, NULL);

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