samples: cellular: slm_shell: Enable hw-flow-control for UART

Enable hw-flow-control by default for the UART between SLM shell
and SLM.

Signed-off-by: Markus Lassila <[email protected]>

Author: MarkusLassila

samples/cellular/slm_shell/README.rst

@@ -14,15 +14,15 @@ See more information on the functionality of this sample from the :ref:`lib_mode
 Requirements
 ************
 
-The SLM application should be configured to use UART_2 on the nRF91 Series DK side with no hardware flow control.
+The SLM application should be configured to use UART2 on the nRF91 Series DK side with hardware flow control.
 
 The sample supports the following development kits:
 
 .. table-from-sample-yaml::
 
 Connect the DK with an nRF91 Series DK based on the pin configuration in DTS overlay files of both sides.
 
-The following table shows how to connect UART_1 of the DK to the nRF91 Series DK's UART_2 for communication through UART:
+The following table shows how to connect UART1 of the DK to the nRF91 Series DK's UART2 for communication through UART:
 
 .. tabs::
 
@@ -37,6 +37,10 @@ The following table shows how to connect UART_1 of the DK to the nRF91 Series DK
            - UART RX P0.11
          * - UART RX P1.01
            - UART TX P0.10
+         * - UART CTS P1.06
+           - UART RTS P0.12
+         * - UART RTS P1.07
+           - UART CTS P0.13
          * - GPIO OUT P0.11 (Button1)
            - GPIO IN P0.31
          * - GPIO IN P0.13 (LED1 optional)
@@ -62,6 +66,10 @@ The following table shows how to connect UART_1 of the DK to the nRF91 Series DK
            - UART RX P0.11
          * - UART RX P1.05
            - UART TX P0.10
+         * - UART CTS P1.06
+           - UART RTS P0.12
+         * - UART RTS P1.07
+           - UART CTS P0.13
          * - GPIO OUT P0.23 (Button1)
            - GPIO IN P0.31
          * - GPIO IN P0.28 (LED1 optional)
@@ -87,6 +95,10 @@ The following table shows how to connect UART_1 of the DK to the nRF91 Series DK
            - UART RX P0.11
          * - UART RX P1.05
            - UART TX P0.10
+         * - UART CTS P1.06
+           - UART RTS P0.12
+         * - UART RTS P1.07
+           - UART CTS P0.13
          * - GPIO OUT P0.31
            - GPIO IN P0.31
          * - GPIO IN P0.30 (optional)

samples/cellular/slm_shell/boards/nrf52840dk_nrf52840.overlay

@@ -11,10 +11,18 @@
 	};
 };
 
+/* Shell UART */
+&uart0 {
+	current-speed = <115200>;
+	status = "okay";
+};
+
+/* SLM Shell <-> SLM UART */
 &uart1 {
 	compatible = "nordic,nrf-uarte";
 	current-speed = <115200>;
 	status = "okay";
+	hw-flow-control;
 
 	pinctrl-0 = <&uart1_default>;
 	pinctrl-1 = <&uart1_sleep>;
@@ -24,18 +32,22 @@
 &pinctrl {
 	uart1_default: uart1_default {
 		group1 {
-			psels = <NRF_PSEL(UART_RX, 1, 1)>;
-			bias-pull-up;
+			psels = <NRF_PSEL(UART_TX, 1, 2)>,
+				<NRF_PSEL(UART_RTS, 1, 6)>;
 		};
 		group2 {
-			psels = <NRF_PSEL(UART_TX, 1, 2)>;
+			psels = <NRF_PSEL(UART_RX, 1, 1)>,
+				<NRF_PSEL(UART_CTS, 1, 7)>;
+			bias-pull-up;
 		};
 	};
 
 	uart1_sleep: uart1_sleep {
 		group1 {
 			psels = <NRF_PSEL(UART_RX, 1, 1)>,
-				<NRF_PSEL(UART_TX, 1, 2)>;
+				<NRF_PSEL(UART_TX, 1, 2)>,
+				<NRF_PSEL(UART_RTS, 1, 6)>,
+				<NRF_PSEL(UART_CTS, 1, 7)>;
 			low-power-enable;
 		};
 	};

samples/cellular/slm_shell/boards/nrf5340dk_nrf5340_cpuapp.conf

@@ -4,7 +4,7 @@
 # SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 #
 
-# Configuration file for nRF53400DK.
+# Configuration file for nRF5340DK.
 # This file is merged with prj.conf in the application folder, and options
 # set here will take precedence if they are present in both files.
 

samples/cellular/slm_shell/boards/nrf5340dk_nrf5340_cpuapp.overlay

@@ -11,11 +11,18 @@
 	};
 };
 
+/* Shell UART */
+&uart0 {
+	current-speed = <115200>;
+	status = "okay";
+};
+
+/* SLM Shell <-> SLM UART */
 &uart2 {
 	compatible = "nordic,nrf-uarte";
 	current-speed = <115200>;
 	status = "okay";
-
+	hw-flow-control;
 	pinctrl-0 = <&uart2_default>;
 	pinctrl-1 = <&uart2_sleep>;
 	pinctrl-names = "default", "sleep";
@@ -24,18 +31,22 @@
 &pinctrl {
 	uart2_default: uart2_default {
 		group1 {
-			psels = <NRF_PSEL(UART_TX, 1, 4)>;
+			psels = <NRF_PSEL(UART_TX, 1, 4)>,
+				<NRF_PSEL(UART_RTS, 1, 6)>;
 		};
 		group2 {
-			psels = <NRF_PSEL(UART_RX, 1, 5)>;
+			psels = <NRF_PSEL(UART_RX, 1, 5)>,
+				<NRF_PSEL(UART_CTS, 1, 7)>;
 			bias-pull-up;
 		};
 	};
 
 	uart2_sleep: uart2_sleep {
 		group1 {
 			psels = <NRF_PSEL(UART_TX, 1, 4)>,
-				<NRF_PSEL(UART_RX, 1, 5)>;
+				<NRF_PSEL(UART_RX, 1, 5)>,
+				<NRF_PSEL(UART_RTS, 1, 6)>,
+				<NRF_PSEL(UART_CTS, 1, 7)>;
 			low-power-enable;
 		};
 	};

samples/cellular/slm_shell/boards/nrf7002dk_nrf5340_cpuapp.overlay

@@ -11,10 +11,18 @@
 	};
 };
 
+/* Shell UART */
+&uart0 {
+	current-speed = <115200>;
+	status = "okay";
+};
+
+/* SLM Shell <-> SLM UART */
 &uart2 {
 	compatible = "nordic,nrf-uarte";
 	current-speed = <115200>;
 	status = "okay";
+	hw-flow-control;
 
 	pinctrl-0 = <&uart2_default>;
 	pinctrl-1 = <&uart2_sleep>;
@@ -24,18 +32,23 @@
 &pinctrl {
 	uart2_default: uart2_default {
 		group1 {
-			psels = <NRF_PSEL(UART_TX, 1, 4)>;
+			psels = <NRF_PSEL(UART_TX, 1, 4)>,
+				<NRF_PSEL(UART_RTS, 1, 6)>;
+
 		};
 		group2 {
-			psels = <NRF_PSEL(UART_RX, 1, 5)>;
+			psels = <NRF_PSEL(UART_RX, 1, 5)>,
+				<NRF_PSEL(UART_CTS, 1, 7)>;
 			bias-pull-up;
 		};
 	};
 
 	uart2_sleep: uart2_sleep {
 		group1 {
 			psels = <NRF_PSEL(UART_TX, 1, 4)>,
-				<NRF_PSEL(UART_RX, 1, 5)>;
+				<NRF_PSEL(UART_RX, 1, 5)>,
+				<NRF_PSEL(UART_RTS, 1, 6)>,
+				<NRF_PSEL(UART_CTS, 1, 7)>;
 			low-power-enable;
 		};
 	};