bloodlight_based.c: Create test for led.c

* Bloodlight_based.c: Test leds with led.c APIs.
* Build bloodlight_based.c by default.

Keep both tests zephyr_based (previous main) and bloodlight_based.c so
the user can select in CMakeFie which test wants to run. zephyr_based to
test leds using zephyrs APIs or bloodlight_based to test them using
bloodlight's APIs.

Signed-off-by: Iker Perez del Palomar Sustatxa <iker.perez@codethink.co.uk>

boards/arm/bloodlight_rev2/Kconfig.defconfig

@@ -20,9 +20,14 @@ config USB_DEVICE_VID
 	depends on USB
     help
       USB device vendor ID. MUST be configured by vendor.
+
 config USB_DEVICE_PID
 	hex "USB Product ID"
 	default 0x0100
 	depends on USB
     help
-      USB device product ID. MUST be configured by vendor.
+      USB device product ID. MUST be configured by vendor.
+
+config PRINTK
+    bool "Send printk() to console"
+    default y

tests/led/CMakeLists.txt

@@ -15,6 +15,6 @@ zephyr_include_directories(${CMAKE_SOURCE_DIR}/../..)
 project(led_test)
 
 target_sources(app PRIVATE 
-    main.c
+    bloodlight_based.c
     ../../src/led.c
 )

tests/led/bloodlight_based.c

@@ -0,0 +1,41 @@
+#include <stddef.h>
+#include <stdint.h>
+#include <sys/printk.h>
+#include <sys/util.h>
+#include <string.h>
+#include <usb/usb_device.h>
+#include <drivers/uart.h>
+
+#include "../../src/led.h"
+#include "../../src/led.c"
+
+void main (void) {
+	const struct device *dev = device_get_binding(
+			CONFIG_UART_CONSOLE_ON_DEV_NAME);
+	uint32_t dtr = 0;
+
+	if (usb_enable(NULL)) {
+		return;
+	}
+
+	/* Poll if the DTR flag was set, optional */
+	while (!dtr) {
+		uart_line_ctrl_get(dev, UART_LINE_CTRL_DTR, &dtr);
+	}
+
+	if (strlen(CONFIG_UART_CONSOLE_ON_DEV_NAME) !=
+	    strlen("CDC_ACM_0") ||
+	    strncmp(CONFIG_UART_CONSOLE_ON_DEV_NAME, "CDC_ACM_0",
+		    strlen(CONFIG_UART_CONSOLE_ON_DEV_NAME))) {
+		printk("Error: Console device name is not USB ACM\n");
+
+		return;
+	}
+
+    printk("Before led init\n");
+    bl_led_init();
+    printk("After led init\n");
+    bl_led_status_set(true);
+    bl_led_set(0xffff);
+
+};