samples: peripheral: lpuart: Enable test execution on nrf54l20pdk

Add overlays needed to execute lpuart tests on nrf54l20pdk.

Signed-off-by: Sebastian Głąb <[email protected]>

Author: nordic-segl

samples/peripheral/lpuart/README.rst

@@ -31,6 +31,7 @@ The sample also requires the following pins to be shorted:
         - nRF21540 DK
         - nRF5340 DK pins
         - nRF54L15 DK pins
+        - nRF54L20 DK pins
         - nRF9160 DK pins
       * - Request-Response Pins
         - P0.24-P0.25
@@ -39,6 +40,7 @@ The sample also requires the following pins to be shorted:
         - P1.07-P1.08
         - P1.14-P1.15
         - P1.08-P1.09
+        - P1.08-P1.09
         - P0.12-P0.13
       * - UART RX-TX Pins
         - P0.22-P0.23
@@ -47,6 +49,7 @@ The sample also requires the following pins to be shorted:
         - P1.05-P1.06
         - P1.12-P1.13
         - P1.10-P1.11
+        - P1.10-P1.11
         - P0.10-P0.11
 
 Additionally, it requires a logic analyzer.

samples/peripheral/lpuart/boards/nrf54l20pdk_nrf54l20_cpuapp.conf

@@ -0,0 +1,9 @@
+#
+# Copyright (c) 2024 Nordic Semiconductor
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+CONFIG_UART_21_ASYNC=y
+CONFIG_UART_21_INTERRUPT_DRIVEN=n
+# Do not use interrupt driven API for console UART to not enable RX.
+CONFIG_UART_20_INTERRUPT_DRIVEN=n

samples/peripheral/lpuart/boards/nrf54l20pdk_nrf54l20_cpuapp.overlay

@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: LicenseRef-Nordic-5-Clause */
+
+&pinctrl {
+	uart21_default_alt: uart21_default_alt {
+		group1 {
+			psels = <NRF_PSEL(UART_RX, 1, 10)>,
+				<NRF_PSEL(UART_TX, 1, 11)>;
+		};
+	};
+
+	uart21_sleep_alt: uart21_sleep_alt {
+		group1 {
+			psels = <NRF_PSEL(UART_RX, 1, 10)>,
+				<NRF_PSEL(UART_TX, 1, 11)>;
+			low-power-enable;
+		};
+	};
+};
+
+&uart21 {
+	status = "okay";
+	pinctrl-0 = <&uart21_default_alt>;
+	pinctrl-1 = <&uart21_sleep_alt>;
+	pinctrl-names = "default", "sleep";
+	current-speed = <115200>;
+	lpuart: nrf-sw-lpuart {
+		compatible = "nordic,nrf-sw-lpuart";
+		status = "okay";
+		req-pin = <40>;
+		rdy-pin = <41>;
+	};
+};
+
+&gpiote20 {
+	status = "okay";
+};
+
+&uart20_default {
+	/* Disconnect CTS and RTS lines from pins.
+	 * This is a workaround for increased current consumption
+	 * (~250 uA more).
+	 */
+	group1 {
+		psels = <NRF_PSEL(UART_TX, 1, 4)>,
+			<NRF_PSEL_DISCONNECTED(UART_RTS)>;
+	};
+	group2 {
+		psels = <NRF_PSEL(UART_RX, 1, 5)>,
+			<NRF_PSEL_DISCONNECTED(UART_CTS)>;
+		bias-pull-up;
+	};
+};

samples/peripheral/lpuart/sample.yaml

@@ -22,6 +22,7 @@ tests:
       - nrf54l15dk/nrf54l05/cpuapp
       - nrf54l15dk/nrf54l10/cpuapp
       - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54l20pdk/nrf54l20/cpuapp
     integration_platforms:
       - nrf52dk/nrf52832
       - nrf52833dk/nrf52833
@@ -51,6 +52,7 @@ tests:
       - nrf54l15dk/nrf54l05/cpuapp
       - nrf54l15dk/nrf54l10/cpuapp
       - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54l20pdk/nrf54l20/cpuapp
     integration_platforms:
       - nrf52840dk/nrf52840
     extra_configs:
@@ -97,6 +99,7 @@ tests:
       - nrf54l15dk/nrf54l05/cpuapp
       - nrf54l15dk/nrf54l10/cpuapp
       - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54l20pdk/nrf54l20/cpuapp
     tags: ppk_power_measure
     harness: pytest
     harness_config:
@@ -133,6 +136,7 @@ tests:
       - nrf54l15dk/nrf54l05/cpuapp
       - nrf54l15dk/nrf54l10/cpuapp
       - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54l20pdk/nrf54l20/cpuapp
     harness: console
     harness_config:
       fixture: gpio_loopback