Use fabs() instead of abs() when using floats

This saves 514 bytes of flash memory

Firmware/Marlin_main.cpp

@@ -5503,7 +5503,7 @@ if(eSoundMode!=e_SOUND_MODE_SILENT)
 		plan_buffer_line_curposXYZE(3000 / 60);
 		st_synchronize();
 		
-		while (abs(degBed() - PINDA_MIN_T) > 1) {
+		while (fabs(degBed() - PINDA_MIN_T) > 1) {
 			delay_keep_alive(1000);
 			serialecho_temperatures();
 		}
@@ -9694,7 +9694,7 @@ void mesh_plan_buffer_line(const float &x, const float &y, const float &z, const
         int n_segments = 0;
 
         if (mbl.active) {
-            float len = abs(dx) + abs(dy);
+            float len = fabs(dx) + fabs(dy);
             if (len > 0)
                 // Split to 3cm segments or shorter.
                 n_segments = int(ceil(len / 30.f));
@@ -11240,7 +11240,7 @@ void uvlo_tiny()
     planner_abort_hard();
 
     // Allow for small roundoffs to be ignored
-    if(abs(current_position[Z_AXIS] - eeprom_read_float((float*)(EEPROM_UVLO_TINY_CURRENT_POSITION_Z))) >= 1.f/cs.axis_steps_per_unit[Z_AXIS])
+    if(fabs(current_position[Z_AXIS] - eeprom_read_float((float*)(EEPROM_UVLO_TINY_CURRENT_POSITION_Z))) >= 1.f/cs.axis_steps_per_unit[Z_AXIS])
     {
         // Clean the input command queue, inhibit serial processing using saved_printing
         cmdqueue_reset();
@@ -12028,7 +12028,7 @@ void M600_wait_for_user(float HotendTempBckp) {
 				break;
 			case 2: //waiting for nozzle to reach target temperature
 
-				if (abs(degTargetHotend(active_extruder) - degHotend(active_extruder)) < 1) {
+				if (fabs(degTargetHotend(active_extruder) - degHotend(active_extruder)) < 1) {
 					lcd_display_message_fullscreen_P(_T(MSG_PRESS_TO_UNLOAD));
 					waiting_start_time = _millis();
 					wait_for_user_state = 0;

Firmware/mesh_bed_calibration.cpp

@@ -993,7 +993,7 @@ bool find_bed_induction_sensor_point_z(float minimum_z, uint8_t n_iter, int
         // we have to let the planner know where we are right now as it is not where we said to go.
         update_current_position_z();
 		//printf_P(PSTR("Zs: %f, Z: %f, delta Z: %f"), z_bckp, current_position[Z_AXIS], (z_bckp - current_position[Z_AXIS]));
-		if (abs(current_position[Z_AXIS] - z_bckp) < 0.025) {
+		if (fabs(current_position[Z_AXIS] - z_bckp) < 0.025) {
 			//printf_P(PSTR("PINDA triggered immediately, move Z higher and repeat measurement\n")); 
 			current_position[Z_AXIS] += 0.5;
 			go_to_current(homing_feedrate[Z_AXIS]/60);
@@ -1019,7 +1019,7 @@ bool find_bed_induction_sensor_point_z(float minimum_z, uint8_t n_iter, int
 //        SERIAL_ECHOPGM("Bed find_bed_induction_sensor_point_z low, height: ");
 //        MYSERIAL.print(current_position[Z_AXIS], 5);
 //        SERIAL_ECHOLNPGM("");
-		float dz = i?abs(current_position[Z_AXIS] - (z / i)):0;
+		float dz = i?fabs(current_position[Z_AXIS] - (z / i)):0;
         z += current_position[Z_AXIS];
 		//printf_P(PSTR("Z[%d] = %d, dz=%d\n"), i, (int)(current_position[Z_AXIS] * 1000), (int)(dz * 1000));
 		//printf_P(PSTR("Z- measurement deviation from avg value %f um\n"), dz);

Firmware/planner.cpp

@@ -1095,7 +1095,7 @@ Having the real displacement of the head, we can calculate the total movement le
      */
     block->use_advance_lead = extruder_advance_K > 0
                               && delta_mm[E_AXIS] >= 0
-                              && abs(delta_mm[Z_AXIS]) < 0.5;
+                              && fabs(delta_mm[Z_AXIS]) < 0.5;
     if (block->use_advance_lead) {
 #ifdef LA_FLOWADJ
         // M221/FLOW should change uniformly the extrusion thickness

Firmware/temperature.cpp

@@ -472,7 +472,7 @@ void __attribute__((noinline)) PID_autotune(float temp, int extruder, int ncycle
 			//SERIAL_ECHOPGM("s. Difference between current and ambient T: ");
 			//MYSERIAL.println(input - temp_ambient);
 
-			if (abs(input - temp_ambient) < 5.0) { 
+			if (fabs(input - temp_ambient) < 5.0) { 
 				temp_runaway_stop(false, (extruder<0));
 				pid_tuning_finished = true;
 				return;

Firmware/ultralcd.cpp

@@ -4794,7 +4794,7 @@ static void wait_preheat()
     delay_keep_alive(2000);
     lcd_display_message_fullscreen_P(_T(MSG_WIZARD_HEATING));
 	lcd_set_custom_characters();
-	while (abs(degHotend(0) - degTargetHotend(0)) > 3) {
+	while (fabs(degHotend(0) - degTargetHotend(0)) > 3) {
         lcd_display_message_fullscreen_P(_T(MSG_WIZARD_HEATING));
 
         lcd_set_cursor(0, 4);
@@ -7760,7 +7760,7 @@ static bool lcd_selfcheck_axis_sg(unsigned char axis) {
 	eeprom_write_word(((uint16_t*)((axis == X_AXIS)?EEPROM_BELTSTATUS_X:EEPROM_BELTSTATUS_Y)), sg1);
 
 	current_position_final = st_get_position_mm(axis);
-	measured_axis_length[0] = abs(current_position_final - current_position_init);
+	measured_axis_length[0] = fabs(current_position_final - current_position_init);
 
 
 // first measurement end and second measurement begin	
@@ -7777,7 +7777,7 @@ static bool lcd_selfcheck_axis_sg(unsigned char axis) {
 
 	current_position_init = st_get_position_mm(axis);
 
-	measured_axis_length[1] = abs(current_position_final - current_position_init);
+	measured_axis_length[1] = fabs(current_position_final - current_position_init);
 
 	tmc2130_home_exit();
 
@@ -7785,7 +7785,7 @@ static bool lcd_selfcheck_axis_sg(unsigned char axis) {
 
 	for(uint_least8_t i = 0; i < 2; i++){ //check if measured axis length corresponds to expected length
 		printf_P(_N("Measured axis length:%.3f\n"), measured_axis_length[i]);
-		if (abs(measured_axis_length[i] - axis_length) > max_error_mm) {
+		if (fabs(measured_axis_length[i] - axis_length) > max_error_mm) {
 			enable_endstops(false);
 
 			const char *_error_1;
@@ -7804,9 +7804,9 @@ static bool lcd_selfcheck_axis_sg(unsigned char axis) {
 		}
 	}
 
-		printf_P(_N("Axis length difference:%.3f\n"), abs(measured_axis_length[0] - measured_axis_length[1]));
+		printf_P(_N("Axis length difference:%.3f\n"), fabs(measured_axis_length[0] - measured_axis_length[1]));
 	
-		if (abs(measured_axis_length[0] - measured_axis_length[1]) > 1) { //check if difference between first and second measurement is low
+		if (fabs(measured_axis_length[0] - measured_axis_length[1]) > 1) { //check if difference between first and second measurement is low
 			//loose pulleys
 			const char *_error_1;