MarlinFirmware · thinkyhead · Dec 27, 2023 · Dec 25, 2023
diff --git a/Marlin/src/HAL/LPC1768/eeprom_sdcard.cpp b/Marlin/src/HAL/LPC1768/eeprom_sdcard.cpp
@@ -91,7 +91,7 @@ bool PersistentStore::access_finish() {
 static void debug_rw(const bool write, int &pos, const uint8_t *value, const size_t size, const FRESULT s, const size_t total=0) {
   #if ENABLED(DEBUG_SD_EEPROM_EMULATION)
     FSTR_P const rw_str = write ? F("write") : F("read");
-    SERIAL_ECHOLN(AS_CHAR(' '), rw_str, F("_data("), pos, AS_CHAR(','), *value, AS_CHAR(','), size, F(", ...)"));
+    SERIAL_ECHOLN(C(' '), rw_str, F("_data("), pos, C(','), *value, C(','), size, F(", ...)"));
     if (total)
       SERIAL_ECHOLN(F(" f_"), rw_str, F("()="), s, F("\n size="), size, F("\n bytes_"), write ? F("written=") : F("read="), total);
     else

diff --git a/Marlin/src/HAL/shared/Delay.cpp b/Marlin/src/HAL/shared/Delay.cpp
@@ -109,7 +109,7 @@
   #if ENABLED(MARLIN_DEV_MODE)
     void dump_delay_accuracy_check() {
       auto report_call_time = [](FSTR_P const name, FSTR_P const unit, const uint32_t cycles, const uint32_t total, const bool do_flush=true) {
-        SERIAL_ECHOLN(F("Calling "), name, F(" for "), cycles, AS_CHAR(' '), unit, F(" took: "), total, AS_CHAR(' '), unit);
+        SERIAL_ECHOLN(F("Calling "), name, F(" for "), cycles, C(' '), unit, F(" took: "), total, C(' '), unit);
         if (do_flush) SERIAL_FLUSHTX();
       };
 

diff --git a/Marlin/src/core/debug_section.h b/Marlin/src/core/debug_section.h
@@ -39,7 +39,7 @@ class SectionLog {
 
   void echo_msg(FSTR_P const fpre) {
     SERIAL_ECHO(fpre);
-    if (the_msg) SERIAL_ECHO(AS_CHAR(' '), the_msg);
+    if (the_msg) SERIAL_ECHO(C(' '), the_msg);
     SERIAL_CHAR(' ');
     print_xyz(xyz_pos_t(current_position));
   }

diff --git a/Marlin/src/core/mstring.h b/Marlin/src/core/mstring.h
@@ -98,7 +98,7 @@ class MString {
 
   void debug(FSTR_P const f) {
     #if ENABLED(MSTRING_DEBUG)
-      SERIAL_ECHOLN(f, AS_CHAR(':'), uintptr_t(str), AS_CHAR(' '), length(), AS_CHAR(' '), str);
+      SERIAL_ECHOLN(f, C(':'), uintptr_t(str), C(' '), length(), C(' '), str);
     #endif
   }
 

diff --git a/Marlin/src/core/serial.h b/Marlin/src/core/serial.h
@@ -148,7 +148,7 @@ template <typename T> void SERIAL_ECHOLN(T x) { SERIAL_IMPL.println(x); }
 
 // Wrapper for ECHO commands to interpret a char
 void SERIAL_ECHO(serial_char_t x);
-#define AS_DIGIT(C) AS_CHAR('0' + (C))
+#define AS_DIGIT(n) C('0' + (n))
 
 // Print an integer with a numeric base such as PrintBase::Hex
 template <typename T> void SERIAL_PRINT(T x, PrintBase y)   { SERIAL_IMPL.print(x, y); }

diff --git a/Marlin/src/core/types.h b/Marlin/src/core/types.h
@@ -298,9 +298,9 @@ typedef IF<TERN0(ABL_USES_GRID, (GRID_MAX_POINTS > 255)), uint16_t, uint8_t>::ty
 #define MMM_TO_MMS(MM_M) feedRate_t(static_cast<float>(MM_M) / 60.0f)
 #define MMS_TO_MMM(MM_S) (static_cast<float>(MM_S) * 60.0f)
 
-// Packaged character for AS_CHAR macro and other usage
+// Packaged character for C macro and other usage
 typedef struct SerialChar { char c; SerialChar(char n) : c(n) { } } serial_char_t;
-#define AS_CHAR(C) serial_char_t(C)
+#define C(c) serial_char_t(c)
 
 // Packaged types: float with precision and/or width; a repeated space/character
 typedef struct WFloat { float value; char width; char prec;

diff --git a/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp b/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp
@@ -465,7 +465,7 @@ void unified_bed_leveling::G29() {
             SERIAL_ECHOLNPGM("Mesh invalidated. Probing mesh.");
           }
           if (param.V_verbosity > 1)
-            SERIAL_ECHOLN(F("Probing around ("), param.XY_pos.x, AS_CHAR(','), param.XY_pos.y, F(").\n"));
+            SERIAL_ECHOLN(F("Probing around ("), param.XY_pos.x, C(','), param.XY_pos.y, F(").\n"));
           probe_entire_mesh(param.XY_pos, parser.seen_test('T'), parser.seen_test('E'), parser.seen_test('U'));
 
           report_current_position();
@@ -1572,14 +1572,14 @@ void unified_bed_leveling::smart_fill_mesh() {
             if (DEBUGGING(LEVELING)) {
               #if ENABLED(UBL_TILT_ON_MESH_POINTS)
                 const xy_pos_t oldLpos = oldRpos.asLogical();
-                DEBUG_ECHO(F("Calculated point: ("), p_float_t(oldRpos.x, 7), AS_CHAR(','), p_float_t(oldRpos.y, 7),
-                           F(")   logical: ("), p_float_t(oldLpos.x, 7), AS_CHAR(','), p_float_t(oldLpos.y, 7),
+                DEBUG_ECHO(F("Calculated point: ("), p_float_t(oldRpos.x, 7), C(','), p_float_t(oldRpos.y, 7),
+                           F(")   logical: ("), p_float_t(oldLpos.x, 7), C(','), p_float_t(oldLpos.y, 7),
                            F(")\nSelected mesh point: ")
                 );
               #endif
               const xy_pos_t lpos = rpos.asLogical();
-              DEBUG_ECHO(      AS_CHAR('('), p_float_t(rpos.x, 7), AS_CHAR(','), p_float_t(rpos.y, 7),
-                         F(")  logical: ("), p_float_t(lpos.x, 7), AS_CHAR(','), p_float_t(lpos.y, 7),
+              DEBUG_ECHO(      C('('), p_float_t(rpos.x, 7), C(','), p_float_t(rpos.y, 7),
+                         F(")  logical: ("), p_float_t(lpos.x, 7), C(','), p_float_t(lpos.y, 7),
                          F(")  measured: "), p_float_t(measured_z, 7),
                          F("  correction: "), p_float_t(zcorr, 7)
               );
@@ -1614,22 +1614,22 @@ void unified_bed_leveling::smart_fill_mesh() {
     vector_3 normal = vector_3(lsf_results.A, lsf_results.B, 1).get_normal();
 
     if (param.V_verbosity > 2)
-      SERIAL_ECHOLN(F("bed plane normal = ["), p_float_t(normal.x, 7), AS_CHAR(','), p_float_t(normal.y, 7), AS_CHAR(','), p_float_t(normal.z, 7), AS_CHAR(']'));
+      SERIAL_ECHOLN(F("bed plane normal = ["), p_float_t(normal.x, 7), C(','), p_float_t(normal.y, 7), C(','), p_float_t(normal.z, 7), C(']'));
 
     matrix_3x3 rotation = matrix_3x3::create_look_at(vector_3(lsf_results.A, lsf_results.B, 1));
 
     GRID_LOOP(i, j) {
       float mx = get_mesh_x(i), my = get_mesh_y(j), mz = z_values[i][j];
 
       if (DEBUGGING(LEVELING)) {
-        DEBUG_ECHOLN(F("before rotation = ["), p_float_t(mx, 7), AS_CHAR(','), p_float_t(my, 7), AS_CHAR(','), p_float_t(mz, 7), F("]   ---> "));
+        DEBUG_ECHOLN(F("before rotation = ["), p_float_t(mx, 7), C(','), p_float_t(my, 7), C(','), p_float_t(mz, 7), F("]   ---> "));
         DEBUG_DELAY(20);
       }
 
       rotation.apply_rotation_xyz(mx, my, mz);
 
       if (DEBUGGING(LEVELING)) {
-        DEBUG_ECHOLN(F("after rotation = ["), p_float_t(mx, 7), AS_CHAR(','), p_float_t(my, 7), AS_CHAR(','), p_float_t(mz, 7), F("]   ---> "));
+        DEBUG_ECHOLN(F("after rotation = ["), p_float_t(mx, 7), C(','), p_float_t(my, 7), C(','), p_float_t(mz, 7), F("]   ---> "));
         DEBUG_DELAY(20);
       }
 
@@ -1641,7 +1641,7 @@ void unified_bed_leveling::smart_fill_mesh() {
       rotation.debug(F("rotation matrix:\n"));
       DEBUG_ECHOLN(F("LSF Results A="), p_float_t(lsf_results.A, 7), F("  B="), p_float_t(lsf_results.B, 7), F("  D="), p_float_t(lsf_results.D, 7));
       DEBUG_DELAY(55);
-      DEBUG_ECHOLN(F("bed plane normal = ["), p_float_t(normal.x, 7), AS_CHAR(','), p_float_t(normal.y, 7), AS_CHAR(','), p_float_t(normal.z, 7), AS_CHAR(']'));
+      DEBUG_ECHOLN(F("bed plane normal = ["), p_float_t(normal.x, 7), C(','), p_float_t(normal.y, 7), C(','), p_float_t(normal.z, 7), C(']'));
       DEBUG_EOL();
 
       /**
@@ -1659,7 +1659,7 @@ void unified_bed_leveling::smart_fill_mesh() {
         };
         auto debug_pt = [](const int num, const xy_pos_t &pos, const_float_t zadd) {
           d_from();
-          DEBUG_ECHOLN(F("Point "), num, AS_CHAR(':'), p_float_t(normed(pos, zadd), 6), F("   Z error = "), p_float_t(zadd - get_z_correction(pos), 6));
+          DEBUG_ECHOLN(F("Point "), num, C(':'), p_float_t(normed(pos, zadd), 6), F("   Z error = "), p_float_t(zadd - get_z_correction(pos), 6));
         };
         debug_pt(1, probe_pt[0], normal.z * gotz[0]);
         debug_pt(2, probe_pt[1], normal.z * gotz[1]);
@@ -1668,7 +1668,7 @@ void unified_bed_leveling::smart_fill_mesh() {
           constexpr xy_float_t safe_xy = { Z_SAFE_HOMING_X_POINT, Z_SAFE_HOMING_Y_POINT };
           d_from(); DEBUG_ECHOLN(F("safe home with Z="), F("0 : "), p_float_t(normed(safe_xy, 0), 6));
           d_from(); DEBUG_ECHOLN(F("safe home with Z="), F("mesh value "), p_float_t(normed(safe_xy, get_z_correction(safe_xy)), 6));
-          DEBUG_ECHO(F("   Z error = ("), Z_SAFE_HOMING_X_POINT, AS_CHAR(','), Z_SAFE_HOMING_Y_POINT, F(") = "), p_float_t(get_z_correction(safe_xy), 6));
+          DEBUG_ECHO(F("   Z error = ("), Z_SAFE_HOMING_X_POINT, C(','), Z_SAFE_HOMING_Y_POINT, F(") = "), p_float_t(get_z_correction(safe_xy), 6));
         #endif
       #endif
     } // DEBUGGING(LEVELING)

diff --git a/Marlin/src/feature/encoder_i2c.cpp b/Marlin/src/feature/encoder_i2c.cpp
@@ -49,7 +49,7 @@ void I2CPositionEncoder::init(const uint8_t address, const AxisEnum axis) {
 
   initialized = true;
 
-  SERIAL_ECHOLNPGM("Setting up encoder on ", AS_CHAR(AXIS_CHAR(encoderAxis)), " axis, addr = ", address);
+  SERIAL_ECHOLNPGM("Setting up encoder on ", C(AXIS_CHAR(encoderAxis)), " axis, addr = ", address);
 
   position = get_position();
 }
@@ -67,7 +67,7 @@ void I2CPositionEncoder::update() {
     /*
     if (trusted) { //commented out as part of the note below
       trusted = false;
-      SERIAL_ECHOLNPGM("Fault detected on ", AS_CHAR(AXIS_CHAR(encoderAxis)), " axis encoder. Disengaging error correction until module is trusted again.");
+      SERIAL_ECHOLNPGM("Fault detected on ", C(AXIS_CHAR(encoderAxis)), " axis encoder. Disengaging error correction until module is trusted again.");
     }
     */
     return;
@@ -92,7 +92,7 @@ void I2CPositionEncoder::update() {
       if (millis() - lastErrorTime > I2CPE_TIME_TRUSTED) {
         trusted = true;
 
-        SERIAL_ECHOLNPGM("Untrusted encoder module on ", AS_CHAR(AXIS_CHAR(encoderAxis)), " axis has been fault-free for set duration, reinstating error correction.");
+        SERIAL_ECHOLNPGM("Untrusted encoder module on ", C(AXIS_CHAR(encoderAxis)), " axis has been fault-free for set duration, reinstating error correction.");
 
         //the encoder likely lost its place when the error occurred, so we'll reset and use the printer's
         //idea of where it the axis is to re-initialize
@@ -106,7 +106,7 @@ void I2CPositionEncoder::update() {
           SERIAL_ECHOLNPGM("Current position is ", pos);
           SERIAL_ECHOLNPGM("Position in encoder ticks is ", positionInTicks);
           SERIAL_ECHOLNPGM("New zero-offset of ", zeroOffset);
-          SERIAL_ECHOLN(F("New position reads as "), get_position(), AS_CHAR('('), mm_from_count(get_position()), AS_CHAR(')'));
+          SERIAL_ECHOLN(F("New position reads as "), get_position(), C('('), mm_from_count(get_position()), C(')'));
         #endif
       }
     #endif

diff --git a/Marlin/src/feature/encoder_i2c.h b/Marlin/src/feature/encoder_i2c.h
@@ -261,32 +261,32 @@ class I2CPositionEncodersMgr {
 
     static void report_error_count(const int8_t idx, const AxisEnum axis) {
       CHECK_IDX();
-      SERIAL_ECHOLNPGM("Error count on ", AS_CHAR(AXIS_CHAR(axis)), " axis is ", encoders[idx].get_error_count());
+      SERIAL_ECHOLNPGM("Error count on ", C(AXIS_CHAR(axis)), " axis is ", encoders[idx].get_error_count());
     }
 
     static void reset_error_count(const int8_t idx, const AxisEnum axis) {
       CHECK_IDX();
       encoders[idx].set_error_count(0);
-      SERIAL_ECHOLNPGM("Error count on ", AS_CHAR(AXIS_CHAR(axis)), " axis has been reset.");
+      SERIAL_ECHOLNPGM("Error count on ", C(AXIS_CHAR(axis)), " axis has been reset.");
     }
 
     static void enable_ec(const int8_t idx, const bool enabled, const AxisEnum axis) {
       CHECK_IDX();
       encoders[idx].set_ec_enabled(enabled);
-      SERIAL_ECHOPGM("Error correction on ", AS_CHAR(AXIS_CHAR(axis)));
+      SERIAL_ECHOPGM("Error correction on ", C(AXIS_CHAR(axis)));
       SERIAL_ECHO_TERNARY(encoders[idx].get_ec_enabled(), " axis is ", "en", "dis", "abled.\n");
     }
 
     static void set_ec_threshold(const int8_t idx, const float newThreshold, const AxisEnum axis) {
       CHECK_IDX();
       encoders[idx].set_ec_threshold(newThreshold);
-      SERIAL_ECHOLNPGM("Error correct threshold for ", AS_CHAR(AXIS_CHAR(axis)), " axis set to ", newThreshold, "mm.");
+      SERIAL_ECHOLNPGM("Error correct threshold for ", C(AXIS_CHAR(axis)), " axis set to ", newThreshold, "mm.");
     }
 
     static void get_ec_threshold(const int8_t idx, const AxisEnum axis) {
       CHECK_IDX();
       const float threshold = encoders[idx].get_ec_threshold();
-      SERIAL_ECHOLNPGM("Error correct threshold for ", AS_CHAR(AXIS_CHAR(axis)), " axis is ", threshold, "mm.");
+      SERIAL_ECHOLNPGM("Error correct threshold for ", C(AXIS_CHAR(axis)), " axis is ", threshold, "mm.");
     }
 
     static int8_t idx_from_axis(const AxisEnum axis) {

diff --git a/Marlin/src/feature/max7219.cpp b/Marlin/src/feature/max7219.cpp
@@ -136,7 +136,7 @@ uint8_t Max7219::suspended; // = 0;
 
 void Max7219::error(FSTR_P const func, const int32_t v1, const int32_t v2/*=-1*/) {
   #if ENABLED(MAX7219_ERRORS)
-    SERIAL_ECHO(F("??? Max7219::"), func, AS_CHAR('('), v1);
+    SERIAL_ECHO(F("??? Max7219::"), func, C('('), v1);
     if (v2 > 0) SERIAL_ECHOPGM(", ", v2);
     SERIAL_CHAR(')');
     SERIAL_EOL();

diff --git a/Marlin/src/feature/meatpack.cpp b/Marlin/src/feature/meatpack.cpp
@@ -140,7 +140,7 @@ void MeatPack::handle_output_char(const uint8_t c) {
   #if ENABLED(MP_DEBUG)
     if (chars_decoded < 1024) {
       ++chars_decoded;
-      DEBUG_ECHOLNPGM("RB: ", AS_CHAR(c));
+      DEBUG_ECHOLNPGM("RB: ", C(c));
     }
   #endif
 }

diff --git a/Marlin/src/feature/mixing.cpp b/Marlin/src/feature/mixing.cpp
@@ -60,7 +60,7 @@ void Mixer::normalize(const uint8_t tool_index) {
   }
   #ifdef MIXER_NORMALIZER_DEBUG
     SERIAL_ECHOPGM("Mixer: Old relation : [ ");
-    MIXER_STEPPER_LOOP(i) SERIAL_ECHO(collector[i] / csum, AS_CHAR(' '));
+    MIXER_STEPPER_LOOP(i) SERIAL_ECHO(collector[i] / csum, C(' '));
     SERIAL_ECHOLNPGM("]");
   #endif
 
@@ -72,12 +72,12 @@ void Mixer::normalize(const uint8_t tool_index) {
     csum = 0;
     SERIAL_ECHOPGM("Mixer: Normalize to : [ ");
     MIXER_STEPPER_LOOP(i) {
-      SERIAL_ECHO(uint16_t(color[tool_index][i]), AS_CHAR(' '));
+      SERIAL_ECHO(uint16_t(color[tool_index][i]), C(' '));
       csum += color[tool_index][i];
     }
     SERIAL_ECHOLNPGM("]");
     SERIAL_ECHOPGM("Mixer: New relation : [ ");
-    MIXER_STEPPER_LOOP(i) SERIAL_ECHO(p_float_t(uint16_t(color[tool_index][i]) / csum, 3), AS_CHAR(' '));
+    MIXER_STEPPER_LOOP(i) SERIAL_ECHO(p_float_t(uint16_t(color[tool_index][i]) / csum, 3), C(' '));
     SERIAL_ECHOLNPGM("]");
   #endif
 

diff --git a/Marlin/src/feature/runout.cpp b/Marlin/src/feature/runout.cpp
@@ -135,7 +135,7 @@ void event_filament_runout(const uint8_t extruder) {
     if (run_runout_script) {
       #if MULTI_FILAMENT_SENSOR
         MString<strlen(FILAMENT_RUNOUT_SCRIPT)> script;
-        script.setf(F(FILAMENT_RUNOUT_SCRIPT), AS_CHAR(tool));
+        script.setf(F(FILAMENT_RUNOUT_SCRIPT), C(tool));
         #if ENABLED(FILAMENT_RUNOUT_SENSOR_DEBUG)
           SERIAL_ECHOLNPGM("Runout Command: ", &script);
         #endif

diff --git a/Marlin/src/gcode/bedlevel/G35.cpp b/Marlin/src/gcode/bedlevel/G35.cpp
@@ -100,7 +100,7 @@ void GcodeSuite::G35() {
     const float z_probed_height = probe.probe_at_point(tramming_points[i], PROBE_PT_RAISE);
     if (isnan(z_probed_height)) {
       SERIAL_ECHO(
-        F("G35 failed at point "), i + 1, F(" ("), FPSTR(pgm_read_ptr(&tramming_point_name[i])), AS_CHAR(')'),
+        F("G35 failed at point "), i + 1, F(" ("), FPSTR(pgm_read_ptr(&tramming_point_name[i])), C(')'),
         FPSTR(SP_X_STR), tramming_points[i].x, FPSTR(SP_Y_STR), tramming_points[i].y
       );
       err_break = true;
@@ -109,7 +109,7 @@ void GcodeSuite::G35() {
 
     if (DEBUGGING(LEVELING)) {
       DEBUG_ECHOLN(
-        F("Probing point "), i + 1, F(" ("), FPSTR(pgm_read_ptr(&tramming_point_name[i])), AS_CHAR(')'),
+        F("Probing point "), i + 1, F(" ("), FPSTR(pgm_read_ptr(&tramming_point_name[i])), C(')'),
         FPSTR(SP_X_STR), tramming_points[i].x, FPSTR(SP_Y_STR), tramming_points[i].y,
         FPSTR(SP_Z_STR), z_probed_height
       );

diff --git a/Marlin/src/gcode/calibrate/G33.cpp b/Marlin/src/gcode/calibrate/G33.cpp
@@ -92,7 +92,7 @@ void ac_cleanup() {
 }
 
 void print_signed_float(FSTR_P const prefix, const_float_t f) {
-  SERIAL_ECHO(F("  "), prefix, AS_CHAR(':'));
+  SERIAL_ECHO(F("  "), prefix, C(':'));
   serial_offset(f);
 }
 

diff --git a/Marlin/src/gcode/calibrate/M48.cpp b/Marlin/src/gcode/calibrate/M48.cpp
@@ -245,7 +245,7 @@ void GcodeSuite::M48() {
       sigma = SQRT(dev_sum / (n + 1));
 
       if (verbose_level > 1) {
-        SERIAL_ECHO(n + 1, F(" of "), n_samples, F(": z: "), p_float_t(pz, 3), AS_CHAR(' '));
+        SERIAL_ECHO(n + 1, F(" of "), n_samples, F(": z: "), p_float_t(pz, 3), C(' '));
         dev_report(verbose_level > 2, mean, sigma, min, max);
         SERIAL_EOL();
       }

diff --git a/Marlin/src/gcode/calibrate/M666.cpp b/Marlin/src/gcode/calibrate/M666.cpp
@@ -52,7 +52,7 @@
           is_err = true;
         else {
           delta_endstop_adj[i] = v;
-          if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPGM("delta_endstop_adj[", AS_CHAR(AXIS_CHAR(i)), "] = ", v);
+          if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPGM("delta_endstop_adj[", C(AXIS_CHAR(i)), "] = ", v);
         }
       }
     }

diff --git a/Marlin/src/gcode/config/M92.cpp b/Marlin/src/gcode/config/M92.cpp
@@ -82,7 +82,7 @@ void GcodeSuite::M92() {
       if (wanted) {
         const float best = uint16_t(wanted / z_full_step_mm) * z_full_step_mm;
         SERIAL_ECHOPGM(", best:[", best);
-        if (best != wanted) { SERIAL_ECHO(AS_CHAR(','), best + z_full_step_mm); }
+        if (best != wanted) { SERIAL_ECHO(C(','), best + z_full_step_mm); }
         SERIAL_CHAR(']');
       }
       SERIAL_ECHOLNPGM(" }");

diff --git a/Marlin/src/gcode/control/M605.cpp b/Marlin/src/gcode/control/M605.cpp
@@ -144,7 +144,7 @@
 
         HOTEND_LOOP() {
           DEBUG_ECHOPGM_P(SP_T_STR, e);
-          LOOP_NUM_AXES(a) DEBUG_ECHOPGM("  hotend_offset[", e, "].", AS_CHAR(AXIS_CHAR(a) | 0x20), "=", hotend_offset[e][a]);
+          LOOP_NUM_AXES(a) DEBUG_ECHOPGM("  hotend_offset[", e, "].", C(AXIS_CHAR(a) | 0x20), "=", hotend_offset[e][a]);
           DEBUG_EOL();
         }
         DEBUG_EOL();

diff --git a/Marlin/src/gcode/feature/advance/M900.cpp b/Marlin/src/gcode/feature/advance/M900.cpp
@@ -131,7 +131,7 @@ void GcodeSuite::M900() {
         SERIAL_ECHOLNPGM("Advance K=", planner.extruder_advance_K[0]);
       #else
         SERIAL_ECHOPGM("Advance K");
-        EXTRUDER_LOOP() SERIAL_ECHO(AS_CHAR(' '), AS_CHAR('0' + e), AS_CHAR(':'), planner.extruder_advance_K[e]);
+        EXTRUDER_LOOP() SERIAL_ECHO(C(' '), C('0' + e), C(':'), planner.extruder_advance_K[e]);
         SERIAL_EOL();
       #endif