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:
43:c0605f23f916
Parent:
39:1dbc943a21cf
--- a/USBDevice/USBDevice.cpp	Fri Feb 27 10:00:59 2015 +0000
+++ b/USBDevice/USBDevice.cpp	Thu Mar 12 14:32:09 2015 +0000
@@ -187,7 +187,7 @@
     /* Check we should be transferring data OUT */
     if (transfer.direction != HOST_TO_DEVICE)
     {
-#if defined(TARGET_KL25Z) | defined(TARGET_KL43Z) | defined(TARGET_KL46Z) | defined(TARGET_K20D5M) | defined(TARGET_K64F) | defined(TARGET_K22F)
+#if defined(TARGET_KL25Z) | defined(TARGET_KL43Z) | defined(TARGET_KL46Z) | defined(TARGET_K20D5M) | defined(TARGET_K64F) | defined(TARGET_K22F) | defined(TARGET_TEENSY3_1)
         /*
          * We seem to have a pending device-to-host transfer.  The host must have
          * sent a new control request without waiting for us to finish processing