Add Ultiboard2 electronics. With PWM current settings. For the few people that have this new board as experiment in their UM-Original.

Marlin/Marlin_main.cpp

@@ -2778,6 +2778,15 @@ void process_commands()
         if(code_seen('B')) digipot_current(4,code_value());
         if(code_seen('S')) for(int i=0;i<=4;i++) digipot_current(i,code_value());
       #endif
+      #ifdef MOTOR_CURRENT_PWM_XY_PIN
+        if(code_seen('X')) digipot_current(0, code_value());
+      #endif
+      #ifdef MOTOR_CURRENT_PWM_Z_PIN
+        if(code_seen('Z')) digipot_current(1, code_value());
+      #endif
+      #ifdef MOTOR_CURRENT_PWM_E_PIN
+        if(code_seen('E')) digipot_current(2, code_value());
+      #endif
     }
     break;
     case 908: // M908 Control digital trimpot directly.

Marlin/pins.h

@@ -1295,6 +1295,89 @@
 
 #endif
 
+#if MOTHERBOARD == 72
+#define KNOWN_BOARD
+/*****************************************************************
+* Ultiboard v2.0 pin assignment
+******************************************************************/
+
+#ifndef __AVR_ATmega2560__
+ #error Oops!  Make sure you have 'Arduino Mega 2560' selected from the 'Tools -> Boards' menu.
+#endif
+
+#define X_STEP_PIN 25
+#define X_DIR_PIN 23
+#define X_STOP_PIN 22
+#define X_ENABLE_PIN 27
+
+#define Y_STEP_PIN 32
+#define Y_DIR_PIN 33
+#define Y_STOP_PIN 26
+#define Y_ENABLE_PIN 31
+
+#define Z_STEP_PIN 35
+#define Z_DIR_PIN 36
+#define Z_STOP_PIN 29
+#define Z_ENABLE_PIN 34
+
+#define HEATER_BED_PIN 4
+#define TEMP_BED_PIN 10
+
+#define HEATER_0_PIN  2
+#define TEMP_0_PIN 8
+
+#define HEATER_1_PIN 3
+#define TEMP_1_PIN 9
+
+#define HEATER_2_PIN -1
+#define TEMP_2_PIN -1
+
+#define E0_STEP_PIN         42
+#define E0_DIR_PIN          43
+#define E0_ENABLE_PIN       37
+
+#define E1_STEP_PIN         49
+#define E1_DIR_PIN          47
+#define E1_ENABLE_PIN       48
+
+#define SDPOWER            -1
+#define SDSS               53
+#define LED_PIN            8
+#define FAN_PIN            7
+#define PS_ON_PIN          12
+#define KILL_PIN           -1
+#define SUICIDE_PIN        -1  //PIN that has to be turned on right after start, to keep power flowing.
+#define SAFETY_TRIGGERED_PIN     28 //PIN to detect the safety circuit has triggered
+#define MAIN_VOLTAGE_MEASURE_PIN 14 //Analogue PIN to measure the main voltage, with a 100k - 4k7 resitor divider.
+
+#define MOTOR_CURRENT_PWM_XY_PIN 44
+#define MOTOR_CURRENT_PWM_Z_PIN 45
+#define MOTOR_CURRENT_PWM_E_PIN 46
+//Motor current PWM conversion, PWM value = MotorCurrentSetting * 255 / range
+#define MOTOR_CURRENT_PWM_RANGE 2000
+
+//arduino pin witch triggers an piezzo beeper
+#define BEEPER 18
+
+#define LCD_PINS_RS 20
+#define LCD_PINS_ENABLE 15
+#define LCD_PINS_D4 14
+#define LCD_PINS_D5 21
+#define LCD_PINS_D6 5
+#define LCD_PINS_D7 6
+
+//buttons are directly attached
+#define BTN_EN1 40
+#define BTN_EN2 41
+#define BTN_ENC 19  //the click
+
+#define BLEN_C 2
+#define BLEN_B 1
+#define BLEN_A 0
+
+#define SDCARDDETECT 39
+
+#endif//MOTHERBOARD == 72
 
 /****************************************************************************************
 * RUMBA pin assignment

Marlin/stepper.cpp

@@ -72,6 +72,9 @@ static volatile bool endstop_z_hit=false;
 #ifdef ABORT_ON_ENDSTOP_HIT_FEATURE_ENABLED
 bool abort_on_endstop_hit = false;
 #endif
+#ifdef MOTOR_CURRENT_PWM_XY_PIN
+  int motor_current_setting[3] = DEFAULT_PWM_MOTOR_CURRENT;
+#endif
 
 static bool old_x_min_endstop=false;
 static bool old_x_max_endstop=false;
@@ -1198,6 +1201,16 @@ void digipot_init() //Initialize Digipot Motor Current
       //digitalPotWrite(digipot_ch[i], digipot_motor_current[i]);
       digipot_current(i,digipot_motor_current[i]);
   #endif
+  #ifdef MOTOR_CURRENT_PWM_XY_PIN
+    pinMode(MOTOR_CURRENT_PWM_XY_PIN, OUTPUT);
+    pinMode(MOTOR_CURRENT_PWM_Z_PIN, OUTPUT);
+    pinMode(MOTOR_CURRENT_PWM_E_PIN, OUTPUT);
+    digipot_current(0, motor_current_setting[0]);
+    digipot_current(1, motor_current_setting[1]);
+    digipot_current(2, motor_current_setting[2]);
+    //Set timer5 to 31khz so the PWM of the motor power is as constant as possible. (removes a buzzing noise)
+    TCCR5B = (TCCR5B & ~(_BV(CS50) | _BV(CS51) | _BV(CS52))) | _BV(CS50);
+  #endif
 }
 
 void digipot_current(uint8_t driver, int current)
@@ -1206,6 +1219,11 @@ void digipot_current(uint8_t driver, int current)
     const uint8_t digipot_ch[] = DIGIPOT_CHANNELS;
     digitalPotWrite(digipot_ch[driver], current);
   #endif
+  #ifdef MOTOR_CURRENT_PWM_XY_PIN
+  if (driver == 0) analogWrite(MOTOR_CURRENT_PWM_XY_PIN, (long)current * 255L / (long)MOTOR_CURRENT_PWM_RANGE);
+  if (driver == 1) analogWrite(MOTOR_CURRENT_PWM_Z_PIN, (long)current * 255L / (long)MOTOR_CURRENT_PWM_RANGE);
+  if (driver == 2) analogWrite(MOTOR_CURRENT_PWM_E_PIN, (long)current * 255L / (long)MOTOR_CURRENT_PWM_RANGE);
+  #endif
 }
 
 void microstep_init()