From 8e823d276f939d79b2d323fad675fb8442a718c2 Mon Sep 17 00:00:00 2001 From: Daniel Gibson Date: Tue, 5 Jan 2021 13:48:43 +0100 Subject: Allow disabling CDC with -DCDC_DISABLED Sometimes Arduino-based USB devices don't work because some hardware (like KVM switches) gets confused by the CDC sub-devices. This change makes it relatively easy to disable CDC at compiletime. Disabling it of course means that the serial console won't work anymore, so you need to use the reset button when flashing. CDC_DISABLED is also used in ArduinoCore-samd for the same purpose. based on https://github.com/gdsports/usb-metamorph/tree/master/USBSerPassThruLine See also https://github.com/NicoHood/HID/issues/225 and https://github.com/arduino/Arduino/issues/6387 and https://forum.arduino.cc/index.php?topic=545288.msg3717028#msg3717028 --- cores/arduino/USBDesc.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'cores/arduino/USBDesc.h') diff --git a/cores/arduino/USBDesc.h b/cores/arduino/USBDesc.h index c0dce07..b55ac20 100644 --- a/cores/arduino/USBDesc.h +++ b/cores/arduino/USBDesc.h @@ -26,8 +26,25 @@ #define ISERIAL_MAX_LEN 20 +// Uncomment the following line or pass -DCDC_DISABLED to the compiler +// to disable CDC (serial console via USB). +// That's useful if you want to create an USB device (like an USB Boot Keyboard) +// that works even with problematic devices (like KVM switches). +// Keep in mind that with this change you'll have to use the Arduino's +// reset button to be able to flash it. +//#define CDC_DISABLED + +#ifndef CDC_DISABLED +#define CDC_ENABLED +#endif + +#ifdef CDC_ENABLED #define CDC_INTERFACE_COUNT 2 #define CDC_ENPOINT_COUNT 3 +#else // CDC_DISABLED +#define CDC_INTERFACE_COUNT 0 +#define CDC_ENPOINT_COUNT 0 +#endif #define CDC_ACM_INTERFACE 0 // CDC ACM #define CDC_DATA_INTERFACE 1 // CDC Data -- cgit v1.2.3-18-g5258