Modify USB profile to remove serial port - just want keyboard (Leonardo)

[unicorn79]

Hello! I'm using IDE 1.8.0 and Arduino leonardo. I try the standard USB HID keyboard sketch. Please tell me how to disable the serial port that appears in Device manager (Windows 7 x64) when the device is connected (after the bootloader finish) - it's called Arduino Leonardo (COM 40) for example. But i need, that there is only a USB HID keyboard and nothing else.
In this thread, dude seem to have decided this question:
Link
but the structure of the USBDesc.h file in my IDE 1.8.0 is different ...

#define PLUGGABLE_USB_ENABLED

#if defined(EPRST6)
#define USB_ENDPOINTS 7 // AtMegaxxU4
#else
#define USB_ENDPOINTS 5 // AtMegaxxU2
#endif

#define ISERIAL_MAX_LEN     20

#define CDC_INTERFACE_COUNT	2
#define CDC_ENPOINT_COUNT	3

#define CDC_ACM_INTERFACE	0	// CDC ACM
#define CDC_DATA_INTERFACE	1	// CDC Data
#define CDC_FIRST_ENDPOINT	1
#define CDC_ENDPOINT_ACM	(CDC_FIRST_ENDPOINT)							// CDC First
#define CDC_ENDPOINT_OUT	(CDC_FIRST_ENDPOINT+1)
#define CDC_ENDPOINT_IN		(CDC_FIRST_ENDPOINT+2)

#define INTERFACE_COUNT		(MSC_INTERFACE + MSC_INTERFACE_COUNT)

#define CDC_RX CDC_ENDPOINT_OUT
#define CDC_TX CDC_ENDPOINT_IN

#define IMANUFACTURER   1
#define IPRODUCT        2
#define ISERIAL         3

Any ideas? Thanks!

[facchinm]

Hi @unicorn79 ,
there is no easy way to get rid of the CDC interface because it's usually the only way to reprogram the board. Anyway, if you know what you are doing, a fast and hacky method is

diff --git a/hardware/arduino/avr/cores/arduino/USBCore.cpp b/hardware/arduino/avr/cores/arduino/USBCore.cpp
index e00fb028e..efbee7be5 100644
--- a/hardware/arduino/avr/cores/arduino/USBCore.cpp
+++ b/hardware/arduino/avr/cores/arduino/USBCore.cpp
@@ -376,8 +376,8 @@ bool ClassInterfaceRequest(USBSetup& setup)
 {
        u8 i = setup.wIndex;
 
-       if (CDC_ACM_INTERFACE == i)
-               return CDC_Setup(setup);
+       //if (CDC_ACM_INTERFACE == i)
+       //      return CDC_Setup(setup);
 
 #ifdef PLUGGABLE_USB_ENABLED
        return PluggableUSB().setup(setup);
@@ -467,7 +467,7 @@ static u8 SendInterfaces()
 {
        u8 interfaces = 0;
 
-       CDC_GetInterface(&interfaces);
+       //CDC_GetInterface(&interfaces);
 
 #ifdef PLUGGABLE_USB_ENABLED
        PluggableUSB().getInterface(&interfaces);

In this way the first two endpoint are not being configured, so probably the OS will complain about it but it should work anyway (it works for sure on Linux).

[unicorn79]

It works perfectly! Thanks a lot! IDE 1.8.0 (Windows 7 x64)

[oliverdoug]

hello unicor79, could you help me with the procedures you performed? I'm having the same problem and tried the tips but I did not succeed.