diff --git a/Marlin/src/HAL/shared/HAL_spi_L6470.cpp b/Marlin/src/HAL/shared/HAL_spi_L6470.cpp
index f3a4544a77..f3c5a31f60 100644
--- a/Marlin/src/HAL/shared/HAL_spi_L6470.cpp
+++ b/Marlin/src/HAL/shared/HAL_spi_L6470.cpp
@@ -25,31 +25,15 @@
  * Copyright (C) 2009 by William Greiman
  */
 
-// --------------------------------------------------------------------------
-// Includes
-// --------------------------------------------------------------------------
-
 #include "../../inc/MarlinConfig.h"
 
 #if HAS_DRIVER(L6470)
 
 #include "Delay.h"
 
-// --------------------------------------------------------------------------
-// Public Variables
-// --------------------------------------------------------------------------
-
-// --------------------------------------------------------------------------
-// Public functions
-// --------------------------------------------------------------------------
-
 #include "../../core/serial.h"
 #include "../../libs/L6470/L6470_Marlin.h"
 
-// --------------------------------------------------------------------------
-// Software L6470 SPI
-// --------------------------------------------------------------------------
-
 // Make sure GCC optimizes this file.
 // Note that this line triggers a bug in GCC which is fixed by casting.
 // See the note below.
diff --git a/Marlin/src/Marlin.h b/Marlin/src/Marlin.h
index cac22c9024..bea5c358c9 100644
--- a/Marlin/src/Marlin.h
+++ b/Marlin/src/Marlin.h
@@ -142,8 +142,6 @@ void manage_inactivity(const bool ignore_stepper_queue=false);
 #define  enable_Z() do{ Z_enable; Z2_enable; Z3_enable; }while(0)
 #define disable_Z() do{ Z_disable; Z2_disable; Z3_disable; CBI(axis_known_position, Z_AXIS); }while(0)
 
-// end  X, Y, Z Stepper enable / disable
-
 //
 // Extruder Stepper enable / disable
 //
@@ -220,7 +218,6 @@ void manage_inactivity(const bool ignore_stepper_queue=false);
   #define  E5_enable NOOP
   #define E5_disable NOOP
 #endif
-// end individual enables/disables
 
 #if ENABLED(MIXING_EXTRUDER)
 
diff --git a/Marlin/src/core/serial.cpp b/Marlin/src/core/serial.cpp
index 2e233d9737..eb39f389ac 100644
--- a/Marlin/src/core/serial.cpp
+++ b/Marlin/src/core/serial.cpp
@@ -52,6 +52,15 @@ void serial_spaces(uint8_t count) { count *= (PROPORTIONAL_FONT_RATIO); while (c
 void serialprint_onoff(const bool onoff) { serialprintPGM(onoff ? PSTR(MSG_ON) : PSTR(MSG_OFF)); }
 void serialprintln_onoff(const bool onoff) { serialprint_onoff(onoff); SERIAL_EOL(); }
 
+void print_bin(const uint16_t val) {
+  uint16_t mask = 0x8000;
+  for (uint8_t i = 16; i--;) {
+    if (i && !(i % 4)) SERIAL_CHAR(' ');
+    SERIAL_CHAR((val & mask) ? '1' : '0');
+    mask >>= 1;
+  }
+}
+
 #if ENABLED(DEBUG_LEVELING_FEATURE)
 
   #include "enum.h"
diff --git a/Marlin/src/core/serial.h b/Marlin/src/core/serial.h
index a248014c68..b2d0f73b3d 100644
--- a/Marlin/src/core/serial.h
+++ b/Marlin/src/core/serial.h
@@ -114,6 +114,8 @@ void serialprint_onoff(const bool onoff);
 void serialprintln_onoff(const bool onoff);
 void serial_spaces(uint8_t count);
 
+void print_bin(const uint16_t val);
+
 #if ENABLED(DEBUG_LEVELING_FEATURE)
   void print_xyz(PGM_P const prefix, PGM_P const suffix, const float x, const float y, const float z);
   void print_xyz(PGM_P const prefix, PGM_P const suffix, const float xyz[]);
diff --git a/Marlin/src/core/utility.cpp b/Marlin/src/core/utility.cpp
index b1a7e42920..e2b44141d8 100644
--- a/Marlin/src/core/utility.cpp
+++ b/Marlin/src/core/utility.cpp
@@ -441,10 +441,3 @@ void safe_delay(millis_t ms) {
   }
 
 #endif // DEBUG_LEVELING_FEATURE
-
-void print_bin(const uint16_t val) {
-  for (uint8_t i = 16; i--;) {
-    SERIAL_ECHO(TEST(val, i));
-    if (!(i & 0x3)) SERIAL_CHAR(' ');
-  }
-}
diff --git a/Marlin/src/core/utility.h b/Marlin/src/core/utility.h
index 3a24608eb9..46dcd5af69 100644
--- a/Marlin/src/core/utility.h
+++ b/Marlin/src/core/utility.h
@@ -120,8 +120,6 @@ inline void serial_delay(const millis_t ms) {
   void log_machine_info();
 #endif
 
-void print_bin(const uint16_t val);
-
 template<typename T>
 class restorer {
   T& ref_;
diff --git a/Marlin/src/inc/SanityCheck.h b/Marlin/src/inc/SanityCheck.h
index 13d1331dfe..6965d8bddb 100644
--- a/Marlin/src/inc/SanityCheck.h
+++ b/Marlin/src/inc/SanityCheck.h
@@ -1953,7 +1953,7 @@ constexpr float sanity_arr_1[] = DEFAULT_AXIS_STEPS_PER_UNIT,
                 sanity_arr_2[] = DEFAULT_MAX_FEEDRATE,
                 sanity_arr_3[] = DEFAULT_MAX_ACCELERATION;
 
-#define _ARR_TEST(N,I) (sanity_arr_##N[MIN(I,COUNT(sanity_arr_##N)-1)] > 0)
+#define _ARR_TEST(N,I) (sanity_arr_##N[MIN(I,int(COUNT(sanity_arr_##N))-1)] > 0)
 
 static_assert(COUNT(sanity_arr_1) >= XYZE, "DEFAULT_AXIS_STEPS_PER_UNIT requires X, Y, Z and E elements.");
 static_assert(COUNT(sanity_arr_1) <= XYZE_N, "DEFAULT_AXIS_STEPS_PER_UNIT has too many elements. (Did you forget to enable DISTINCT_E_FACTORS?)");
diff --git a/Marlin/src/libs/L6470/000_l6470_read_me.md b/Marlin/src/libs/L6470/000_l6470_read_me.md
index 170ba6596e..712ced551b 100644
--- a/Marlin/src/libs/L6470/000_l6470_read_me.md
+++ b/Marlin/src/libs/L6470/000_l6470_read_me.md
@@ -6,20 +6,20 @@ These devices use voltage PWMs to drive the stepper phases. Phase current is not
 
 This software assumes that all L6470 drivers are in one SPI daisy chain.
 
-``` {.gcode}
+```
     The hardware setup is:
 
-        MOSI from controller tied to SDI on the first device
+      MOSI from controller tied to SDI on the first device
 
-        SDO of the first device is tied to SDI of the next device
+      SDO of the first device is tied to SDI of the next device
 
-        SDO of the last device is tied to MISO of the controller
+      SDO of the last device is tied to MISO of the controller
 
-        all devices share the same SCK, SS\_PIN and RESET\_PIN
+      all devices share the same SCK, SS\_PIN and RESET\_PIN
 
-        Each L6470 passes the data it saw on its SDI to its neighbor on the **NEXT** SPI cycle (8 bit delay).
+      Each L6470 passes the data it saw on its SDI to its neighbor on the **NEXT** SPI cycle (8 bit delay).
 
-        Each L6470 acts on the **last** SPI data it saw when the SS\_PIN **goes high**.
+      Each L6470 acts on the **last** SPI data it saw when the SS\_PIN **goes high**.
 ```
 
 The L6470 drivers operate in STEP\_CLOCK mode. In this mode the direction and enable are done via SPI commands and the phase currents are changed in response to step pulses (generated in the usual way).
@@ -58,12 +58,12 @@ The steppers are **NOT** powered up during this sequence.
 
 This array is used by all routines that transmit SPI data.
 
-``` {.gcode}
+```
   Location 0 - number of drivers in chain
 
   Location 1 - axis index for first device in the chain (closest to MOSI)
 
-  …
+  ...
 
   Location N - axis index for last device in the N device long chain (closest to MISO)
 ```
diff --git a/Marlin/src/libs/L6470/L6470_Marlin.h b/Marlin/src/libs/L6470/L6470_Marlin.h
index b2bbcc2ee4..a29e40739e 100644
--- a/Marlin/src/libs/L6470/L6470_Marlin.h
+++ b/Marlin/src/libs/L6470/L6470_Marlin.h
@@ -19,6 +19,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 #include "../../inc/MarlinConfig.h"
 
@@ -61,7 +62,7 @@ public:
   static char index_to_axis[MAX_L6470][3];
   static uint8_t dir_commands[MAX_L6470];
 
-  // flags to guarantee graceful switch if stepper interrupts L6470 SPI transfer
+  // Flags to guarantee graceful switch if stepper interrupts L6470 SPI transfer
   static volatile bool spi_abort;
   static bool spi_active;
 
diff --git a/Marlin/src/module/temperature.h b/Marlin/src/module/temperature.h
index 0e1a132fb6..fd0706e20e 100644
--- a/Marlin/src/module/temperature.h
+++ b/Marlin/src/module/temperature.h
@@ -640,7 +640,7 @@ class Temperature {
         static uint8_t auto_report_temp_interval;
         static millis_t next_temp_report_ms;
         static void auto_report_temperatures(void);
-        FORCE_INLINE void set_auto_report_interval(uint8_t v) {
+        static inline void set_auto_report_interval(uint8_t v) {
           NOMORE(v, 60);
           auto_report_temp_interval = v;
           next_temp_report_ms = millis() + 1000UL * v;
diff --git a/Marlin/src/sd/cardreader.h b/Marlin/src/sd/cardreader.h
index a13633eafe..44a698bd5c 100644
--- a/Marlin/src/sd/cardreader.h
+++ b/Marlin/src/sd/cardreader.h
@@ -128,7 +128,7 @@ public:
 
   #if ENABLED(AUTO_REPORT_SD_STATUS)
     static void auto_report_sd_status(void);
-    static inline void set_auto_report_interval(const uint8_t v) {
+    static inline void set_auto_report_interval(uint8_t v) {
       #if NUM_SERIAL > 1
         auto_report_port = serial_port_index;
       #endif