'UART_SIGNAL_TXD_INV' was not declared in this scope

[kokospalme]

When I want to compile the RX example, the compiler gives me following error (file dmx.cpp, line 191):
/ESP32-DMX/src/dmx.cpp:191:45: error: 'UART_SIGNAL_TXD_INV' was not declared in this scope

I dont't really know where this define should be or what it should looks like...
Can you guys please help me?
cheers

[CypixDev]

Just add "#include <esp32-hal-gpio.h>" to "dmx.h"