Set PICO_STDIO_USB_CONNECT_WAIT_TIMEOUT_MS (#496)

If you use stdio_usb for the examples you miss some of the output while
USB is connected. Set PICO_STDIO_USB_CONNECT_WAIT_TIMEOUT_MS to a
sensible default so you see all the output

CMakeLists.txt

@@ -15,6 +15,11 @@ endif()
 
 set(PICO_EXAMPLES_PATH ${PROJECT_SOURCE_DIR})
 
+# If you want debug output from USB (pass -DPICO_STDIO_USB=1) this ensures you don't lose any debug output while USB is set up
+if (NOT DEFINED PICO_STDIO_USB_CONNECT_WAIT_TIMEOUT_MS)
+    set(PICO_STDIO_USB_CONNECT_WAIT_TIMEOUT_MS 3000)
+endif()
+
 # Initialize the SDK
 pico_sdk_init()