tests: uart_basic_api: add support for CDC ACM UART

Add support for CDC ACM UART.

Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>

tests/drivers/uart/uart_basic_api/overlay-usb.conf

@@ -0,0 +1,5 @@
+CONFIG_USB_DEVICE_STACK=y
+CONFIG_USB_DEVICE_PRODUCT="Zephyr CDC ACM UART"
+CONFIG_USB_UART_CONSOLE=y
+CONFIG_UART_LINE_CTRL=y
+CONFIG_TEST_LOGGING_DEFAULTS=n

tests/drivers/uart/uart_basic_api/src/main.c

@@ -11,6 +11,7 @@
  * @}
  */
 
+#include <usb/usb_device.h>
 #include "test_uart.h"
 
 #ifdef CONFIG_SHELL
@@ -57,6 +58,20 @@ void test_uart_pending(void)
 
 void test_main(void)
 {
+#if defined(CONFIG_USB_UART_CONSOLE)
+	const struct device *dev;
+	uint32_t dtr = 0;
+
+	dev = DEVICE_DT_GET(DT_CHOSEN(zephyr_console));
+	if (!device_is_ready(dev) || usb_enable(NULL)) {
+		return;
+	}
+
+	while (!dtr) {
+		uart_line_ctrl_get(dev, UART_LINE_CTRL_DTR, &dtr);
+		k_sleep(K_MSEC(100));
+	}
+#endif
 #ifndef CONFIG_SHELL
 	ztest_test_suite(uart_basic_test,
 			 ztest_unit_test(test_uart_configure),

tests/drivers/uart/uart_basic_api/testcase.yaml

@@ -18,3 +18,10 @@ tests:
     tags: drivers
     filter: CONFIG_UART_CONSOLE
     harness: keyboard
+  drivers.uart.cdc_acm:
+    extra_args: OVERLAY_CONFIG="overlay-usb.conf"
+                DTC_OVERLAY_FILE="usb.overlay"
+    tags: drivers usb
+    filter: CONFIG_UART_CONSOLE
+    depends_on: usb_device
+    harness: keyboard

tests/drivers/uart/uart_basic_api/usb.overlay

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2021 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	chosen {
+		zephyr,console = &cdc_acm_uart0;
+	};
+};
+
+&zephyr_udc0 {
+	cdc_acm_uart0: cdc_acm_uart0 {
+		compatible = "zephyr,cdc-acm-uart";
+		label = "CDC_ACM_0";
+	};
+};