my first commit

hello_world/usb/CMakeLists.txt

@@ -1,10 +1,11 @@
 if (TARGET tinyusb_device)
     add_executable(hello_usb
-            hello_usb.c
+            hello_usb.cpp
             )
-
+    set(PICO_CXX_ENABLE_EXCEPTIONS 1)
     # pull in common dependencies
-    target_link_libraries(hello_usb pico_stdlib)
+    target_link_libraries(hello_usb pico_stdlib pico_multicore pico_util)
+    target_compile_definitions(hello_usb PRIVATE PARAM_ASSERTIONS_ENABLE_ALL=1)
 
     # enable usb output, disable uart output
     pico_enable_stdio_usb(hello_usb 1)

hello_world/usb/hello_usb.c

@@ -1,16 +0,0 @@
-/**
- * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <stdio.h>
-#include "pico/stdlib.h"
-
-int main() {
-    stdio_init_all();
-    while (true) {
-        printf("Hello, world!\n");
-        sleep_ms(1000);
-    }
-}

hello_world/usb/hello_usb.cpp

@@ -0,0 +1,44 @@
+/**
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include "pico/stdlib.h"
+#include "pico/mutex.h"
+#include "pico/multicore.h"
+#include "wrappers/Queue.h"
+#include <string>
+
+auto_init_mutex(printf_lock);
+Queue<std::string> queue(10);
+//Queue<int> int_queue(10);
+
+void main1() {
+    while (true) {
+        std::string message;
+        queue.blocking_remove(&message);
+        printf(message.c_str());
+        printf("\n");
+        //int count;
+        //int_queue.blocking_remove(&count);
+        //printf("%i\n", count);
+    }
+}
+
+extern "C"
+int main() {
+    stdio_init_all();
+    multicore_launch_core1(main1);
+    int count = 0;
+    while (true) {
+        std::string message;
+        message = std::to_string(count++);
+        printf("Is wrapped: %i\n", queue.wrapped);
+        printf("Enqueue %s\n", message.c_str());
+        queue.blocking_add(&message);
+        //int_queue.blocking_add(&count);
+        sleep_ms(1000);
+    }
+}