function test USBMSD(as external strage for PC USB) and USBSerial. Switching between USBMSD and USBSerial(Not work simultaneously)

see /users/kenjiArai/notebook/usb-interface--usbhost-and-usbdevice/

Revision:
1:7a568319eeb7
Parent:
0:c6dea1f647f6
--- a/check_revision.cpp	Mon Jan 06 10:56:13 2020 +0000
+++ b/check_revision.cpp	Thu Apr 30 23:43:35 2020 +0000
@@ -1,21 +1,25 @@
 /*
  * Check Mbed revision
  *
- * Copyright (c) 2019 Kenji Arai / JH1PJL
- *  http://www.page.sannet.ne.jp/kenjia/index.html
+ * Copyright (c) 2019,'20 Kenji Arai / JH1PJL
+ *  http://www7b.biglobe.ne.jp/~kenjia/
  *  https://os.mbed.com/users/kenjiArai/
  *      Created:    July      17th, 2019
- *      Revised:    December  24th, 2019
+ *      Revised:    April     28th, 2020
  */
 
 #include "mbed.h"
-
-//    RUN ONLY ON mbed-os5.15.0
-//      https://github.com/ARMmbed/mbed-os/releases/tag/mbed-os-5.15.0
+ 
+//    RUN ONLY ON mbed-os-5.15.2
+//      https://github.com/ARMmbed/mbed-os/releases/tag/mbed-os-5.15.2
 #if (MBED_MAJOR_VERSION == 5) &&\
     (MBED_MINOR_VERSION == 15) &&\
-    (MBED_PATCH_VERSION == 0)
+    (MBED_PATCH_VERSION == 2)
+#elif (MBED_MAJOR_VERSION == 5) &&\
+    (MBED_MINOR_VERSION == 15) &&\
+    (MBED_PATCH_VERSION == 1)
+    // use mbed-os-5.15.2 but mbed_version.h has 5.15.1 value
 #else
-    //#warning "Please use Mbed-os5.15.0"
-    #error "Please use Mbed-os5.15.0"
+    //#warning "Please use mbed-os-5.15.2"
+    #error "Please use mbed-os-5.15.2"
 #endif
\ No newline at end of file