USB device stack; Added getter method for terminal_connected;

Fork of USBDevice by mbed official

Example of use:

#include "mbed.h"
#include "USBSerial.h"

USBSerial  pc;
DigitalOut blue_led(P0_20);

int main() {
    blue_led = 1;
    while(!pc.getTerminal_connected()); //Wait for serial terminal to connect...
    while(1) {
        blue_led = 0;
        wait(0.2);
        blue_led = 1;
        wait(0.2);
    }
}
Revision:
17:bbd6dac92961
Parent:
1:80ab0d068708
--- a/USBDevice/USBDevice_Types.h	Thu Dec 05 13:00:15 2013 +0000
+++ b/USBDevice/USBDevice_Types.h	Thu Jan 23 17:30:20 2014 +0000
@@ -49,7 +49,7 @@
 
 /* Descriptors */
 #define DESCRIPTOR_TYPE(wValue)  (wValue >> 8)
-#define DESCRIPTOR_INDEX(wValue) (wValue & 0xf)
+#define DESCRIPTOR_INDEX(wValue) (wValue & 0xff)
 
 typedef struct {
     struct {