userpins.h should only contain what a board definition otherwise would contain, like this:
#define KNOWN_BOARD
#define CPU_ARCH ARCH_ARM
/**************************************************************
Arduino Due Pin Assignments
****************************************************************/
#define ORIG_X_STEP_PIN 24
#define ORIG_X_DIR_PIN 23
#define ORIG_X_MIN_PIN 28
#define ORIG_X_MAX_PIN 34
#define ORIG_X_ENABLE_PIN 26
#define ORIG_Y_STEP_PIN 17
#define ORIG_Y_DIR_PIN 16
#define ORIG_Y_MIN_PIN 30
#define ORIG_Y_MAX_PIN 36
#define ORIG_Y_ENABLE_PIN 22
#define ORIG_Z_STEP_PIN 2
#define ORIG_Z_DIR_PIN 3
#define ORIG_Z_MIN_PIN 32
#define ORIG_Z_MAX_PIN 38
#define ORIG_Z_ENABLE_PIN 15
// Note that on the Due pin A0 on the board is channel 2 on the ARM chip
#define HEATER_0_PIN 13
// Due analog pin #54
#define TEMP_0_PIN 7
#define HEATER_1_PIN 7
#define TEMP_1_PIN 3
// Due analog pin #58
#define HEATER_2_PIN 12
// Due analog pin #55
#define TEMP_2_PIN 6
#define HEATER_3_PIN 11
// Due analog pin #56
#define TEMP_3_PIN 5
// Due analog pin #57
#define TEMP_4_PIN 4
// Due analog pin #59 = A5 -> AD 2
#define THERMOCOUPLE_0_PIN 2
// There are no more analog pins freely available.
// You can use direction and enable pin from extruder 0 socket as they are also
// analog pins. Then you need to move the stepper driver to a different socket.
// Direction pin of extruder 0
#define THERMOCOUPLE_1_PIN 1
// Step pin of extruder 0
#define THERMOCOUPLE_2_PIN 0
// Enable pin of extruder 0
#define THERMOCOUPLE_3_PIN 10
#define ORIG_E0_STEP_PIN 61
#define ORIG_E0_DIR_PIN 60
#define ORIG_E0_ENABLE_PIN 62
#define ORIG_E1_STEP_PIN 64
#define ORIG_E1_DIR_PIN 63
#define ORIG_E1_ENABLE_PIN 65
#define ORIG_E2_STEP_PIN 51
#define ORIG_E2_DIR_PIN 53
#define ORIG_E2_ENABLE_PIN 49
// Extra driver on extension board
// Might require pin 66 high for some drivers!
#define ORIG_E3_STEP_PIN 35
#define ORIG_E3_DIR_PIN 33
#define ORIG_E3_ENABLE_PIN 37
// Extra driver on extension port
// Might require pin 25 high for some drivers!
#define ORIG_E4_STEP_PIN 29
#define ORIG_E4_DIR_PIN 27
#define ORIG_E4_ENABLE_PIN 31
#define ORIG_E5_STEP_PIN 67
#define ORIG_E5_DIR_PIN 66
#define ORIG_E5_ENABLE_PIN 68
#define EXTENSION_BOARD_MS1 67
#define EXTENSION_BOARD_MS2 68
#define EXTENSION_BOARD_MS3 69
// 66 -> not connected
// 25 -> not connected
// To set microstepping on startup set START_GCODE to e.g.
// "M42 P67 S255\nM42 P68 S255\nM42 P69 S255"
#define SDSUPPORT 1
#define SDPOWER -1
// 4,10,52 if using HW SPI.
#define SDSS 4
#define ORIG_SDCARDDETECT 14
#define SDCARDDETECTINVERTED 0
#define LED_PIN -1
#define ORIG_FAN_PIN 9
#define ORIG_FAN2_PIN 8
#define ORIG_PS_ON_PIN 40
#define KILL_PIN -1
#define SUICIDE_PIN -1 //PIN that has to be turned on right after start, to keep power flowing.
// 20 or 70
#define SDA_PIN 20
// 21 or 71
#define SCL_PIN 21
// Servo pins: 5,6 und 39
#define E0_PINS ORIG_E0_STEP_PIN,ORIG_E0_DIR_PIN,ORIG_E0_ENABLE_PIN,
#define E1_PINS ORIG_E1_STEP_PIN,ORIG_E1_DIR_PIN,ORIG_E1_ENABLE_PIN,
#define E2_PINS ORIG_E2_STEP_PIN,ORIG_E2_DIR_PIN,ORIG_E2_ENABLE_PIN,
#define E3_PINS ORIG_E3_STEP_PIN,ORIG_E3_DIR_PIN,ORIG_E3_ENABLE_PIN,
#define E4_PINS ORIG_E4_STEP_PIN,ORIG_E4_DIR_PIN,ORIG_E4_ENABLE_PIN,
#define E5_PINS ORIG_E5_STEP_PIN,ORIG_E5_DIR_PIN,ORIG_E5_ENABLE_PIN,
#define TWI_CLOCK_FREQ 400000
// see eeprom device data sheet for the following values these are for 24xx256
#define EEPROM_SERIAL_ADDR 0x50 // 7 bit i2c address (without R/W bit)
#define EEPROM_PAGE_SIZE 64 // page write buffer size
#define EEPROM_PAGE_WRITE_TIME 7 // page write time in milliseconds (docs say 5ms but that is too short)
// specify size of eeprom address register
// TWI_MMR_IADRSZ_1_BYTE for 1 byte, or TWI_MMR_IADRSZ_2_BYTE for 2 byte
#define EEPROM_ADDRSZ_BYTES TWI_MMR_IADRSZ_2_BYTE
#define EEPROM_AVAILABLE 1
