Apply const, spacing, etc.

Marlin/M100_Free_Mem_Chk.cpp

@@ -189,7 +189,6 @@ void free_memory_pool_report(char * const ptr, const int16_t size) {
    *  This is useful to check the correctness of the M100 D and the M100 F commands.
    */
   void corrupt_free_memory(char *ptr, const uint16_t size) {
-    if (parser.seen('C')) {
     ptr += 8;
     const uint16_t near_top = top_of_stack() - ptr - 250, // -250 to avoid interrupt activity that's altered the stack.
                    j = near_top / (size + 1);
@@ -202,7 +201,6 @@ void free_memory_pool_report(char * const ptr, const int16_t size) {
     }
     SERIAL_EOL();
   }
-  }
 #endif // M100_FREE_MEMORY_CORRUPTOR
 
 /**

Marlin/Marlin_main.cpp

@@ -1276,16 +1276,17 @@ void get_available_commands() {
  *
  * Returns TRUE if the target is invalid
  */
-bool get_target_extruder_from_command(int code) {
+bool get_target_extruder_from_command(const uint16_t code) {
   if (parser.seen('T')) {
-    if (parser.value_byte() >= EXTRUDERS) {
+    const int8_t e = parser.value_byte();
+    if (e >= EXTRUDERS) {
       SERIAL_ECHO_START();
       SERIAL_CHAR('M');
       SERIAL_ECHO(code);
-      SERIAL_ECHOLNPAIR(" " MSG_INVALID_EXTRUDER " ", parser.value_byte());
+      SERIAL_ECHOLNPAIR(" " MSG_INVALID_EXTRUDER " ", e);
       return true;
     }
-    target_extruder = parser.value_byte();
+    target_extruder = e;
   }
   else
     target_extruder = active_extruder;
@@ -5676,7 +5677,7 @@ inline void gcode_G92() {
         #if HAS_POSITION_SHIFT
           const float p = current_position[i];
         #endif
-        float v = parser.value_axis_units((AxisEnum)i);
+        const float v = parser.value_axis_units((AxisEnum)i);
 
         current_position[i] = v;
 
@@ -6405,7 +6406,7 @@ static bool pin_is_protected(const int8_t pin) {
 inline void gcode_M42() {
   if (!parser.seen('S')) return;
 
-  int pin_status = parser.value_int();
+  const int pin_status = parser.value_int();
   if (!WITHIN(pin_status, 0, 255)) return;
 
   int pin_number = parser.seen('P') ? parser.value_int() : LED_PIN;
@@ -6645,7 +6646,7 @@ inline void gcode_M42() {
    */
   inline void gcode_M43() {
 
-    if (parser.seen('T')) {   // must be first or else it's "S" and "E" parameters will execute endstop or servo test
+    if (parser.seen('T')) {   // must be first or else its "S" and "E" parameters will execute endstop or servo test
       toggle_pins();
       return;
     }
@@ -8580,7 +8581,7 @@ inline void gcode_M226() {
    */
   inline void gcode_M280() {
     if (!parser.seen('P')) return;
-    int servo_index = parser.value_int();
+    const int servo_index = parser.value_int();
     if (WITHIN(servo_index, 0, NUM_SERVOS - 1)) {
       if (parser.seen('S'))
         MOVE_SERVO(servo_index, parser.value_int());
@@ -8753,7 +8754,7 @@ inline void gcode_M226() {
    *       M302 S170 P1 ; set min extrude temp to 170 but leave disabled
    */
   inline void gcode_M302() {
-    bool seen_S = parser.seen('S');
+    const bool seen_S = parser.seen('S');
     if (seen_S) {
       thermalManager.extrude_min_temp = parser.value_celsius();
       thermalManager.allow_cold_extrude = (thermalManager.extrude_min_temp == 0);
@@ -8960,10 +8961,12 @@ inline void gcode_M400() { stepper.synchronize(); }
    * M405: Turn on filament sensor for control
    */
   inline void gcode_M405() {
-    // This is technically a linear measurement, but since it's quantized to centimeters and is a different unit than
+    // This is technically a linear measurement, but since it's quantized to centimeters and is a different
-    // everything else, it uses parser.value_int() instead of parser.value_linear_units().
+    // unit than everything else, it uses parser.value_byte() instead of parser.value_linear_units().
-    if (parser.seen('D')) meas_delay_cm = parser.value_byte();
+    if (parser.seen('D')) {
+      meas_delay_cm = parser.value_byte();
       NOMORE(meas_delay_cm, MAX_MEASUREMENT_DELAY);
+    }
 
     if (filwidth_delay_index[1] == -1) { // Initialize the ring buffer if not done since startup
       const uint8_t temp_ratio = thermalManager.widthFil_to_size_ratio() - 100; // -100 to scale within a signed byte

Marlin/SdFatStructs.h

@@ -523,7 +523,7 @@ struct directoryEntry {
   uint8_t  reservedNT;
           /**
            * The granularity of the seconds part of creationTime is 2 seconds
-           * so this field is a count of tenths of a second and its valid
+           * so this field is a count of tenths of a second and it's valid
            * value range is 0-199 inclusive. (WHG note - seems to be hundredths)
            */
   uint8_t  creationTimeTenths;

Marlin/example_configurations/K8400/README.md

@@ -2,7 +2,7 @@
 http://www.k8400.eu/
 
 Configuration files for the K8400, ported upstream from the official Velleman firmware.
-Like it's predecessor, (K8200), the K8400 is a 3Drag clone. There are some minor differences, documented in pins_K8400.h.
+Like its predecessor, (K8200), the K8400 is a 3Drag clone. There are some minor differences, documented in pins_K8400.h.
 
 Single and dual head configurations provided. Copy the correct Configuration.h and Configuration_adv.h to the /Marlin/ directory.
 

Marlin/servo.cpp

@@ -95,7 +95,7 @@ static inline void handle_interrupts(timer16_Sequence_t timer, volatile uint16_t
   if (SERVO_INDEX(timer, Channel[timer]) < ServoCount && Channel[timer] < SERVOS_PER_TIMER) {
     *OCRnA = *TCNTn + SERVO(timer, Channel[timer]).ticks;
     if (SERVO(timer, Channel[timer]).Pin.isActive)    // check if activated
-      digitalWrite(SERVO(timer, Channel[timer]).Pin.nbr, HIGH); // its an active channel so pulse it high
+      digitalWrite(SERVO(timer, Channel[timer]).Pin.nbr, HIGH); // it's an active channel so pulse it high
   }
   else {
     // finished all channels so wait for the refresh period to expire before starting over

Marlin/twibus.h

@@ -38,18 +38,18 @@ typedef void (*twiRequestFunc_t)();
 /**
  * TWIBUS class
  *
- * This class implements a wrapper around the two wire (I2C) bus, it allows
+ * This class implements a wrapper around the two wire (I2C) bus, allowing
- * Marlin to send and request data from any slave device on the bus. This is
+ * Marlin to send and request data from any slave device on the bus.
- * an experimental feature and it's inner workings as well as public facing
- * interface are prune to change in the future.
  *
- * The two main consumers of this class are M260 and M261, where M260 allows
+ * The two main consumers of this class are M260 and M261. M260 provides a way
- * Marlin to send a I2C packet to a device (please be aware that no repeated
+ * to send an I2C packet to a device (no repeated starts) by caching up to 32
- * starts are possible), this can be done in caching method by calling multiple
+ * bytes in a buffer and then sending the buffer.
- * times M260 B<byte-1 value in base 10> or a one liner M260, have a look at
+ * M261 requests data from a device. The received data is relayed to serial out
- * the gcode_M260() function for more information. M261 allows Marlin to
+ * for the host to interpret.
- * request data from a device, the received data is then relayed into the serial
+ *
- * line for host interpretation.
+ *  For more information see
+ *    - http://marlinfw.org/docs/gcode/M260.html 
+ *    - http://marlinfw.org/docs/gcode/M261.html 
  *
  */
 class TWIBus {