shell: uart: added shell command

Added shell command for UART. Currently only able to set baudrate and
flow control.

Signed-off-by: Yishai Jaffe <yishai1999@gmail.com>

drivers/serial/CMakeLists.txt

@@ -8,6 +8,7 @@ zephyr_library()
 zephyr_library_sources_ifdef(CONFIG_SERIAL_TEST serial_test.c)
 zephyr_library_sources_ifdef(CONFIG_UART_ASYNC_RX_HELPER uart_async_rx.c)
 zephyr_library_sources_ifdef(CONFIG_UART_ASYNC_TO_INT_DRIVEN_API uart_async_to_irq.c)
+zephyr_library_sources_ifdef(CONFIG_UART_SHELL uart_shell.c)
 zephyr_library_sources_ifdef(CONFIG_USB_CDC_ACM ${ZEPHYR_BASE}/misc/empty_file.c)
 # zephyr-keep-sorted-stop
 

drivers/serial/Kconfig

@@ -148,6 +148,12 @@ config UART_ASYNC_TO_INT_DRIVEN_RX_TIMEOUT
 	help
 	  Receiver inactivity timeout. It is used to calculate timeout in microseconds.
 
+config UART_SHELL
+	bool "UART Shell commands"
+	depends on SHELL
+	help
+	  UART Shell commands
+
 comment "Serial Drivers"
 
 # zephyr-keep-sorted-start

drivers/serial/uart_shell.c

@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2024 Yishai Jaffe <yishai1999@gmail.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/drivers/uart.h>
+#include <zephyr/shell/shell.h>
+#include <stdlib.h>
+
+#include <zephyr/logging/log.h>
+LOG_MODULE_REGISTER(uart_shell, CONFIG_LOG_DEFAULT_LEVEL);
+
+static bool device_is_uart(const struct device *dev)
+{
+	return DEVICE_API_IS(uart, dev);
+}
+
+static int cmd_uart_baudrate(const struct shell *sh, size_t argc, char **argv)
+{
+	char *s_dev_name = argv[1];
+	const struct device *dev;
+	struct uart_config cfg;
+	uint32_t baudrate;
+	int ret;
+
+	dev = shell_device_get_binding(s_dev_name);
+	if (!dev || !device_is_uart(dev)) {
+		shell_error(sh, "UART: Device driver %s not found.", s_dev_name);
+		return -ENODEV;
+	}
+
+	baudrate = strtol(argv[2], NULL, 10);
+	ret = uart_config_get(dev, &cfg);
+	if (ret < 0) {
+		shell_error(sh, "UART: Failed to get current configuration: %d", ret);
+		return ret;
+	}
+	cfg.baudrate = baudrate;
+
+	ret = uart_configure(dev, &cfg);
+	if (ret < 0) {
+		shell_error(sh, "UART: Failed to configure device: %d", ret);
+		return ret;
+	}
+	return 0;
+}
+
+static int cmd_uart_flow_control(const struct shell *sh, size_t argc, char **argv)
+{
+	char *s_dev_name = argv[1];
+	const struct device *dev;
+	struct uart_config cfg;
+	uint8_t flow_control;
+	int ret;
+
+	dev = shell_device_get_binding(s_dev_name);
+	if (!dev || !device_is_uart(dev)) {
+		shell_error(sh, "UART: Device driver %s not found.", s_dev_name);
+		return -ENODEV;
+	}
+
+	if (!strcmp(argv[2], "none")) {
+		flow_control = UART_CFG_FLOW_CTRL_NONE;
+	} else if (!strcmp(argv[2], "rtscts")) {
+		flow_control = UART_CFG_FLOW_CTRL_RTS_CTS;
+	} else if (!strcmp(argv[2], "dtrdsr")) {
+		flow_control = UART_CFG_FLOW_CTRL_DTR_DSR;
+	} else if (!strcmp(argv[2], "rs485")) {
+		flow_control = UART_CFG_FLOW_CTRL_RS485;
+	} else {
+		shell_error(sh, "Unknown: '%s'", argv[2]);
+		shell_help(sh);
+		return SHELL_CMD_HELP_PRINTED;
+	}
+
+	ret = uart_config_get(dev, &cfg);
+	if (ret < 0) {
+		shell_error(sh, "UART: Failed to get current configuration: %d", ret);
+		return ret;
+	}
+	cfg.flow_ctrl = flow_control;
+
+	ret = uart_configure(dev, &cfg);
+	if (ret < 0) {
+		shell_error(sh, "UART: Failed to configure device: %d", ret);
+		return ret;
+	}
+	return 0;
+}
+
+static void device_name_get(size_t idx, struct shell_static_entry *entry)
+{
+	const struct device *dev = shell_device_filter(idx, device_is_uart);
+
+	entry->syntax = (dev != NULL) ? dev->name : NULL;
+	entry->handler = NULL;
+	entry->help = NULL;
+	entry->subcmd = NULL;
+}
+
+SHELL_DYNAMIC_CMD_CREATE(dsub_device_name, device_name_get);
+
+SHELL_STATIC_SUBCMD_SET_CREATE(sub_uart_cmds,
+	SHELL_CMD_ARG(baudrate, &dsub_device_name,
+			  "Configure UART device baudrate\n"
+			  "Usage: baudrate <device> <baudrate>",
+			  cmd_uart_baudrate, 3, 0),
+	SHELL_CMD_ARG(fc, &dsub_device_name,
+			  "Configure UART device flow control\n"
+			  "Usage: fc <device> <none|rtscts|dtrdsr|rs485>",
+			  cmd_uart_flow_control, 3, 0),
+	SHELL_SUBCMD_SET_END     /* Array terminated. */
+);
+
+SHELL_CMD_REGISTER(uart, &sub_uart_cmds, "UART commands", NULL);