🧑‍💻 General and Axis-based bitfield flags (#23989)

Marlin/src/core/types.h

 
 #define AXIS_COLLISION(L) (AXIS4_NAME == L || AXIS5_NAME == L || AXIS6_NAME == L || AXIS7_NAME == L || AXIS8_NAME == L || AXIS9_NAME == L)
 
+// General Flags for some number of states
+template<size_t N>
+struct Flags {
+  typedef typename IF<(N>8), uint16_t, uint8_t>::type bits_t;
+  typedef struct { bool b0:1, b1:1, b2:1, b3:1, b4:1, b5:1, b6:1, b7:1; } N8;
+  typedef struct { bool b0:1, b1:1, b2:1, b3:1, b4:1, b5:1, b6:1, b7:1, b8:1, b9:1, b10:1, b11:1, b12:1, b13:1, b14:1, b15:1; } N16;
+  union {
+    bits_t b;
+    typename IF<(N>8), N16, N8>::type flag;
+  };
+  void reset()                             { b = 0; }
+  void set(const int n, const bool onoff)  { onoff ? set(n) : clear(n); }
+  void set(const int n)                    { b |=  (bits_t)_BV(n); }
+  void clear(const int n)                  { b &= ~(bits_t)_BV(n); }
+  bool test(const int n) const             { return TEST(b, n); }
+        bool operator[](const int n)       { return test(n); }
+  const bool operator[](const int n) const { return test(n); }
+  const int size() const                   { return sizeof(b); }
+};
+
+// Specialization for a single bool flag
+template<>
+struct Flags<1> {
+  bool b;
+  void reset()                            { b = false; }
+  void set(const int n, const bool onoff) { onoff ? set(n) : clear(n); }
+  void set(const int)                     { b = true; }
+  void clear(const int)                   { b = false; }
+  bool test(const int) const              { return b; }
+        bool operator[](const int)        { return b; }
+  const bool operator[](const int) const  { return b; }
+  const int size() const                  { return sizeof(b); }
+};
+
+typedef Flags<8> flags_8_t;
+typedef Flags<16> flags_16_t;
+
+// Flags for some axis states, with per-axis aliases xyzijkuvwe
+typedef struct AxisFlags {
+  union {
+    struct Flags<LOGICAL_AXES> flags;
+    struct { bool LOGICAL_AXIS_LIST(e:1, x:1, y:1, z:1, i:1, j:1, k:1, u:1, v:1, w:1); };
+  };
+  void reset()                             { flags.reset(); }
+  void set(const int n)                    { flags.set(n); }
+  void set(const int n, const bool onoff)  { flags.set(n, onoff); }
+  void clear(const int n)                  { flags.clear(n); }
+  bool test(const int n) const             { return flags.test(n); }
+        bool operator[](const int n)       { return flags[n]; }
+  const bool operator[](const int n) const { return flags[n]; }
+  const int size() const                   { return sizeof(flags); }
+} axis_flags_t;
+
 //
 // Enumerated axis indices
 //

Marlin/src/feature/fancheck.cpp

 #if HAS_AUTO_FAN && EXTRUDER_AUTO_FAN_SPEED != 255 && DISABLED(FOURWIRES_FANS)
   bool FanCheck::measuring = false;
 #endif
-bool FanCheck::tacho_state[TACHO_COUNT];
+Flags<TACHO_COUNT> FanCheck::tacho_state;
 uint16_t FanCheck::edge_counter[TACHO_COUNT];
 uint8_t FanCheck::rps[TACHO_COUNT];
 FanCheck::TachoError FanCheck::error = FanCheck::TachoError::NONE;
 
     if (status != tacho_state[f]) {
       if (measuring) ++edge_counter[f];
-      tacho_state[f] = status;
+      tacho_state.set(f, status);
     }
   }
 }

Marlin/src/feature/fancheck.h

     #else
       static constexpr bool measuring = true;
     #endif
-    static bool tacho_state[TACHO_COUNT];
+    static Flags<TACHO_COUNT> tacho_state;
     static uint16_t edge_counter[TACHO_COUNT];
     static uint8_t rps[TACHO_COUNT];
     static TachoError error;

Marlin/src/feature/fwretract.cpp

 // private:
 
 #if HAS_MULTI_EXTRUDER
-  bool FWRetract::retracted_swap[EXTRUDERS];          // Which extruders are swap-retracted
+  Flags<EXTRUDERS> FWRetract::retracted_swap;         // Which extruders are swap-retracted
 #endif
 
 // public:
   bool FWRetract::autoretract_enabled;                // M209 S - Autoretract switch
 #endif
 
-bool FWRetract::retracted[EXTRUDERS];                 // Which extruders are currently retracted
+Flags<EXTRUDERS> FWRetract::retracted;                // Which extruders are currently retracted
 
 float FWRetract::current_retract[EXTRUDERS],          // Retract value used by planner
       FWRetract::current_hop;
   settings.swap_retract_recover_feedrate_mm_s = RETRACT_RECOVER_FEEDRATE_SWAP;
   current_hop = 0.0;
 
+  retracted.reset();
   EXTRUDER_LOOP() {
-    retracted[e] = false;
-    E_TERN_(retracted_swap[e] = false);
+    E_TERN_(retracted_swap.clear(e));
     current_retract[e] = 0.0;
   }
 }
 
   TERN_(RETRACT_SYNC_MIXING, mixer.T(old_mixing_tool));   // Restore original mixing tool
 
-  retracted[active_extruder] = retracting;                // Active extruder now retracted / recovered
+  retracted.set(active_extruder, retracting);             // Active extruder now retracted / recovered
 
   // If swap retract/recover update the retracted_swap flag too
   #if HAS_MULTI_EXTRUDER
-    if (swapping) retracted_swap[active_extruder] = retracting;
+    if (swapping) retracted_swap.set(active_extruder, retracting);
   #endif
 
   /* // debugging

Marlin/src/feature/fwretract.h

 class FWRetract {
 private:
   #if HAS_MULTI_EXTRUDER
-    static bool retracted_swap[EXTRUDERS];         // Which extruders are swap-retracted
+    static Flags<EXTRUDERS> retracted_swap;        // Which extruders are swap-retracted
   #endif
 
 public:
     static constexpr bool autoretract_enabled = false;
   #endif
 
-  static bool retracted[EXTRUDERS];                // Which extruders are currently retracted
+  static Flags<EXTRUDERS> retracted;               // Which extruders are currently retracted
   static float current_retract[EXTRUDERS],         // Retract value used by planner
                current_hop;                        // Hop value used by planner
 
 
   static void reset();
 
-  static void refresh_autoretract() {
-    EXTRUDER_LOOP() retracted[e] = false;
-  }
+  static void refresh_autoretract() { retracted.reset(); }
 
   static void enable_autoretract(const bool enable) {
     #if ENABLED(FWRETRACT_AUTORETRACT)

Marlin/src/feature/powerloss.cpp

     EXTRUDER_LOOP() {
       if (info.retract[e] != 0.0) {
         fwretract.current_retract[e] = info.retract[e];
-        fwretract.retracted[e] = true;
+        fwretract.retracted.set(e);
       }
     }
     fwretract.current_hop = info.retract_hop;

Marlin/src/gcode/control/M17_M18_M84.cpp

 #include "../../core/debug_out.h"
 #include "../../libs/hex_print.h"
 
-inline axis_flags_t selected_axis_bits() {
-  axis_flags_t selected{0};
+inline stepper_flags_t selected_axis_bits() {
+  stepper_flags_t selected{0};
   #if HAS_EXTRUDERS
     if (parser.seen('E')) {
       if (E_TERN0(parser.has_value())) {
 }
 
 // Enable specified axes and warn about other affected axes
-void do_enable(const axis_flags_t to_enable) {
+void do_enable(const stepper_flags_t to_enable) {
   const ena_mask_t was_enabled = stepper.axis_enabled.bits,
                   shall_enable = to_enable.bits & ~was_enabled;
 
   }
 }
 
-void try_to_disable(const axis_flags_t to_disable) {
+void try_to_disable(const stepper_flags_t to_disable) {
   ena_mask_t still_enabled = to_disable.bits & stepper.axis_enabled.bits;
 
   DEBUG_ECHOLNPGM("Enabled: ", hex_word(stepper.axis_enabled.bits), " To Disable: ", hex_word(to_disable.bits), " | ", hex_word(still_enabled));

Marlin/src/lcd/menu/menu_tramming.cpp

 #include "../../core/debug_out.h"
 
 static float z_measured[G35_PROBE_COUNT];
-static bool z_isvalid[G35_PROBE_COUNT];
+static Flags<G35_PROBE_COUNT> z_isvalid;
 static uint8_t tram_index = 0;
 static int8_t reference_index; // = 0
 
   move_to_tramming_wait_pos();
 
   DEBUG_ECHOLNPGM("probe_single_point(", tram_index, ") = ", z_probed_height, "mm");
-  return (z_isvalid[tram_index] = !isnan(z_probed_height));
+
+  const bool v = !isnan(z_probed_height);
+  z_isvalid.set(tram_index, v);
+  return v;
 }
 
 static void _menu_single_probe() {
   ui.defer_status_screen();
 
   // Initialize measured point flags
-  ZERO(z_isvalid);
+  z_isvalid.reset();
   reference_index = -1;
 
   // Inject G28, wait for homing to complete,

Marlin/src/module/settings.cpp

 #endif
 
 #define _EN_ITEM(N) , E##N
+#define _EN1_ITEM(N) , E##N:1
 
-typedef struct { uint16_t NUM_AXIS_LIST(X, Y, Z, I, J, K, U, V, W), X2, Y2, Z2, Z3, Z4 REPEAT(E_STEPPERS, _EN_ITEM); } tmc_stepper_current_t;
-typedef struct { uint32_t NUM_AXIS_LIST(X, Y, Z, I, J, K, U, V, W), X2, Y2, Z2, Z3, Z4 REPEAT(E_STEPPERS, _EN_ITEM); } tmc_hybrid_threshold_t;
-typedef struct {  int16_t NUM_AXIS_LIST(X, Y, Z, I, J, K, U, V, W), X2, Y2, Z2, Z3, Z4;                              } tmc_sgt_t;
-typedef struct {     bool NUM_AXIS_LIST(X, Y, Z, I, J, K, U, V, W), X2, Y2, Z2, Z3, Z4 REPEAT(E_STEPPERS, _EN_ITEM); } tmc_stealth_enabled_t;
+typedef struct { uint16_t NUM_AXIS_LIST(X, Y, Z, I, J, K, U, V, W), X2, Y2, Z2, Z3, Z4 REPEAT(E_STEPPERS, _EN_ITEM); } per_stepper_uint16_t;
+typedef struct { uint32_t NUM_AXIS_LIST(X, Y, Z, I, J, K, U, V, W), X2, Y2, Z2, Z3, Z4 REPEAT(E_STEPPERS, _EN_ITEM); } per_stepper_uint32_t;
+typedef struct {  int16_t NUM_AXIS_LIST(X, Y, Z, I, J, K, U, V, W), X2, Y2, Z2, Z3, Z4;                              } mot_stepper_int16_t;
+typedef struct {     bool NUM_AXIS_LIST(X:1, Y:1, Z:1, I:1, J:1, K:1, U:1, V:1, W:1), X2:1, Y2:1, Z2:1, Z3:1, Z4:1 REPEAT(E_STEPPERS, _EN1_ITEM); } per_stepper_bool_t;
 
 #undef _EN_ITEM
 
   //
   // HAS_TRINAMIC_CONFIG
   //
-  tmc_stepper_current_t tmc_stepper_current;            // M906 X Y Z X2 Y2 Z2 Z3 Z4 E0 E1 E2 E3 E4 E5
-  tmc_hybrid_threshold_t tmc_hybrid_threshold;          // M913 X Y Z X2 Y2 Z2 Z3 Z4 E0 E1 E2 E3 E4 E5
-  tmc_sgt_t tmc_sgt;                                    // M914 X Y Z X2 Y2 Z2 Z3 Z4
-  tmc_stealth_enabled_t tmc_stealth_enabled;            // M569 X Y Z X2 Y2 Z2 Z3 Z4 E0 E1 E2 E3 E4 E5
+  per_stepper_uint16_t tmc_stepper_current;             // M906 X Y Z I J K U V W X2 Y2 Z2 Z3 Z4 E0 E1 E2 E3 E4 E5
+  per_stepper_uint32_t tmc_hybrid_threshold;            // M913 X Y Z I J K U V W X2 Y2 Z2 Z3 Z4 E0 E1 E2 E3 E4 E5
+  mot_stepper_int16_t tmc_sgt;                          // M914 X Y Z I J K U V W X2 Y2 Z2 Z3 Z4
+  per_stepper_bool_t tmc_stealth_enabled;               // M569 X Y Z I J K U V W X2 Y2 Z2 Z3 Z4 E0 E1 E2 E3 E4 E5
 
   //
   // LIN_ADVANCE
     {
       _FIELD_TEST(tmc_stepper_current);
 
-      tmc_stepper_current_t tmc_stepper_current{0};
+      per_stepper_uint16_t tmc_stepper_current{0};
 
       #if HAS_TRINAMIC_CONFIG
         #if AXIS_IS_TMC(X)
       _FIELD_TEST(tmc_hybrid_threshold);
 
       #if ENABLED(HYBRID_THRESHOLD)
-        tmc_hybrid_threshold_t tmc_hybrid_threshold{0};
+        per_stepper_uint32_t tmc_hybrid_threshold{0};
         TERN_(X_HAS_STEALTHCHOP,  tmc_hybrid_threshold.X =  stepperX.get_pwm_thrs());
         TERN_(Y_HAS_STEALTHCHOP,  tmc_hybrid_threshold.Y =  stepperY.get_pwm_thrs());
         TERN_(Z_HAS_STEALTHCHOP,  tmc_hybrid_threshold.Z =  stepperZ.get_pwm_thrs());
         TERN_(E7_HAS_STEALTHCHOP, tmc_hybrid_threshold.E7 = stepperE7.get_pwm_thrs());
       #else
         #define _EN_ITEM(N) , .E##N =  30
-        const tmc_hybrid_threshold_t tmc_hybrid_threshold = {
+        const per_stepper_uint32_t tmc_hybrid_threshold = {
           NUM_AXIS_LIST(.X = 100, .Y = 100, .Z = 3, .I = 3, .J = 3, .K = 3, .U = 3, .V = 3, .W = 3),
           .X2 = 100, .Y2 = 100, .Z2 = 3, .Z3 = 3, .Z4 = 3
           REPEAT(E_STEPPERS, _EN_ITEM)
     // TMC StallGuard threshold
     //
     {
-      tmc_sgt_t tmc_sgt{0};
+      mot_stepper_int16_t tmc_sgt{0};
       #if USE_SENSORLESS
         NUM_AXIS_CODE(
           TERN_(X_SENSORLESS, tmc_sgt.X = stepperX.homing_threshold()),
     {
       _FIELD_TEST(tmc_stealth_enabled);
 
-      tmc_stealth_enabled_t tmc_stealth_enabled = { false };
+      per_stepper_bool_t tmc_stealth_enabled = { false };
       TERN_(X_HAS_STEALTHCHOP,  tmc_stealth_enabled.X  = stepperX.get_stored_stealthChop());
       TERN_(Y_HAS_STEALTHCHOP,  tmc_stealth_enabled.Y  = stepperY.get_stored_stealthChop());
       TERN_(Z_HAS_STEALTHCHOP,  tmc_stealth_enabled.Z  = stepperZ.get_stored_stealthChop());
       {
         _FIELD_TEST(tmc_stepper_current);
 
-        tmc_stepper_current_t currents;
+        per_stepper_uint16_t currents;
         EEPROM_READ(currents);
 
         #if HAS_TRINAMIC_CONFIG
 
       // TMC Hybrid Threshold
       {
-        tmc_hybrid_threshold_t tmc_hybrid_threshold;
+        per_stepper_uint32_t tmc_hybrid_threshold;
         _FIELD_TEST(tmc_hybrid_threshold);
         EEPROM_READ(tmc_hybrid_threshold);
 
       // TMC StallGuard threshold.
       //
       {
-        tmc_sgt_t tmc_sgt;
+        mot_stepper_int16_t tmc_sgt;
         _FIELD_TEST(tmc_sgt);
         EEPROM_READ(tmc_sgt);
         #if USE_SENSORLESS
       {
         _FIELD_TEST(tmc_stealth_enabled);
 
-        tmc_stealth_enabled_t tmc_stealth_enabled;
+        per_stepper_bool_t tmc_stealth_enabled;
         EEPROM_READ(tmc_stealth_enabled);
 
         #if HAS_TRINAMIC_CONFIG

Marlin/src/module/stepper.cpp

   #endif
 #endif
 
-axis_flags_t Stepper::axis_enabled; // {0}
+stepper_flags_t Stepper::axis_enabled; // {0}
 
 // private:
 

Marlin/src/module/stepper.h

   };
   constexpr ena_mask_t linear_bits() { return _BV(NUM_AXES) - 1; }
   constexpr ena_mask_t e_bits() { return (_BV(EXTRUDERS) - 1) << NUM_AXES; }
-} axis_flags_t;
+} stepper_flags_t;
 
 // All the stepper enable pins
 constexpr pin_t ena_pins[] = {
       static void refresh_motor_power();
     #endif
 
-    static axis_flags_t axis_enabled;   // Axis stepper(s) ENABLED states
+    static stepper_flags_t axis_enabled;  // Axis stepper(s) ENABLED states
 
     static bool axis_is_enabled(const AxisEnum axis E_OPTARG(const uint8_t eindex=0)) {
       return TEST(axis_enabled.bits, INDEX_OF_AXIS(axis, eindex));

Marlin/src/module/temperature.cpp

         static hotend_pid_t work_pid[HOTENDS];
         static float temp_iState[HOTENDS] = { 0 },
                      temp_dState[HOTENDS] = { 0 };
-        static bool pid_reset[HOTENDS] = { false };
+        static Flags<HOTENDS> pid_reset;
         const float pid_error = temp_hotend[ee].target - temp_hotend[ee].celsius;
 
         float pid_output;
           || TERN0(HEATER_IDLE_HANDLER, heater_idle[ee].timed_out)
         ) {
           pid_output = 0;
-          pid_reset[ee] = true;
+          pid_reset.set(ee);
         }
         else if (pid_error > PID_FUNCTIONAL_RANGE) {
           pid_output = PID_MAX;
-          pid_reset[ee] = true;
+          pid_reset.set(ee);
         }
         else {
           if (pid_reset[ee]) {
             temp_iState[ee] = 0.0;
             work_pid[ee].Kd = 0.0;
-            pid_reset[ee] = false;
+            pid_reset.clear(ee);
           }
 
           work_pid[ee].Kd = work_pid[ee].Kd + PID_K2 * (PID_PARAM(Kd, ee) * (temp_dState[ee] - temp_hotend[ee].celsius) - work_pid[ee].Kd);

Marlin/src/module/tool_change.cpp

 #endif
 
 #if ENABLED(TOOLCHANGE_FS_INIT_BEFORE_SWAP)
-  bool toolchange_extruder_ready[EXTRUDERS];
+  Flags<EXTRUDERS> toolchange_extruder_ready;
 #endif
 
 #if EITHER(MAGNETIC_PARKING_EXTRUDER, TOOL_SENSOR) \
       if (new_tool == old_tool && !first_tool_is_primed && enable_first_prime) {
         tool_change_prime();
         first_tool_is_primed = true;
-        TERN_(TOOLCHANGE_FS_INIT_BEFORE_SWAP, toolchange_extruder_ready[old_tool] = true); // Primed and initialized
+        TERN_(TOOLCHANGE_FS_INIT_BEFORE_SWAP, toolchange_extruder_ready.set(old_tool)); // Primed and initialized
       }
     #endif
 
 
             #if ENABLED(TOOLCHANGE_FS_INIT_BEFORE_SWAP)
               if (!toolchange_extruder_ready[new_tool]) {
-                toolchange_extruder_ready[new_tool] = true;
+                toolchange_extruder_ready.set(new_tool);
                 fr = toolchange_settings.prime_speed;       // Next move is a prime
                 unscaled_e_move(0, MMM_TO_MMS(fr));         // Init planner with 0 length move
               }
 
     // Migrate the retracted state
     #if ENABLED(FWRETRACT)
-      fwretract.retracted[migration_extruder] = fwretract.retracted[active_extruder];
+      fwretract.retracted.set(migration_extruder, fwretract.retracted[active_extruder]);
     #endif
 
     // Migrate the temperature to the new hotend

Marlin/src/module/tool_change.h

   #endif
 
   #if ENABLED(TOOLCHANGE_FS_INIT_BEFORE_SWAP)
-    extern bool toolchange_extruder_ready[EXTRUDERS];
+    extern Flags<EXTRUDERS> toolchange_extruder_ready;
   #endif
 
   #if ENABLED(TOOLCHANGE_MIGRATION_FEATURE)