see https://developer.mbed.org/users/okini3939/notebook/graphic-poi/

Dependencies:   IAP RAM_DISK USBDevice mbed

Revision:
0:49512863ec9b
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/USBDevice.lib	Thu Dec 01 01:58:40 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/USBDevice/#01321bd6ff89