diff options
| author | Daniel Gibson <metalcaedes@gmail.com> | 2021-01-05 13:48:43 +0100 |
|---|---|---|
| committer | Daniel Gibson <metalcaedes@gmail.com> | 2021-01-06 17:27:52 +0100 |
| commit | 8e823d276f939d79b2d323fad675fb8442a718c2 (patch) | |
| tree | 54af191c3614736bafc4ad66e9c3e4512403140e /cores/arduino/USBDesc.h | |
| parent | 60f0d0b125e06dbf57b800192c80e5f60d681438 (diff) | |
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
Diffstat (limited to 'cores/arduino/USBDesc.h')
| -rw-r--r-- | cores/arduino/USBDesc.h | 17 |
1 files changed, 17 insertions, 0 deletions
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 |