#define DRIVE_SYSTEM 0

#define SDA_PIN         20  

firmware  hangs when i use #define UI_HAS_I2C_KEYS.

#define DRIVE_SYSTEM 3

#define

#define COMPILE_I2C_DRIVER

Easy question: Is it possible to disable the UI_RESET_PIN by setting it to "#define UI_RESET_PIN -1"? Or will I encounter any problems with that?

#define MCP_IN_ADDRESS 0x20

#define UI_DISPLAY_I2C_ADDRESS 0x4e but the firmware freezes again.

#define UI_DISPLAY_RS_PIN _BV(0)

#define EXT1_HEATER_PIN HEATER_0_PIN

#define UI_DISPLAY_RS_PIN _BV(2)

#define UI_KEYS_I2C_BUTTON_LOW(pin,action_) if((keymask & pin)==0) action=action_;

#define UI_DISPLAY_I2C_ADDRESS 0x4e

#define UI_ACTION_AUTOLEVEL_G32S2        1215

Whats the problem? Just put the coordinates behind#define Z_PROBE_X1  100

#define Z_PROBE_X1 

#define Z_PROBE_X1 

#define DISABLE_MIN_ENDSTOPS

#define ACK_WITH_LINENUMBER 0