Add SERIAL_FLOAT_PRECISION option (#18367)

Marlin/Configuration_adv.h

 // This option inserts short delays between lines of serial output.
 #define SERIAL_OVERRUN_PROTECTION
 
+// For serial echo, the number of digits after the decimal point
+//#define SERIAL_FLOAT_PRECISION 4
+
 // @section extras
 
 /**

Marlin/src/MarlinCore.cpp

   #if ENABLED(MARLIN_DEV_MODE)
     auto log_current_ms = [&](PGM_P const msg) {
       SERIAL_ECHO_START();
-      SERIAL_CHAR('['); SERIAL_ECHO(millis()); SERIAL_ECHO("] ");
+      SERIAL_CHAR('['); SERIAL_ECHO(millis()); SERIAL_ECHOPGM("] ");
       serialprintPGM(msg);
       SERIAL_EOL();
     };

Marlin/src/core/debug_out.h

 #undef DEBUG_ERROR_START
 #undef DEBUG_CHAR
 #undef DEBUG_ECHO
+#undef DEBUG_DECIMAL
 #undef DEBUG_ECHO_F
 #undef DEBUG_ECHOLN
 #undef DEBUG_ECHOPGM
   #define DEBUG_ERROR_START       SERIAL_ERROR_START
   #define DEBUG_CHAR              SERIAL_CHAR
   #define DEBUG_ECHO              SERIAL_ECHO
+  #define DEBUG_DECIMAL           SERIAL_DECIMAL
   #define DEBUG_ECHO_F            SERIAL_ECHO_F
   #define DEBUG_ECHOLN            SERIAL_ECHOLN
   #define DEBUG_ECHOPGM           SERIAL_ECHOPGM
   #define DEBUG_ERROR_START()       NOOP
   #define DEBUG_CHAR(...)           NOOP
   #define DEBUG_ECHO(...)           NOOP
+  #define DEBUG_DECIMAL(...)        NOOP
   #define DEBUG_ECHO_F(...)         NOOP
   #define DEBUG_ECHOLN(...)         NOOP
   #define DEBUG_ECHOPGM(...)        NOOP

Marlin/src/core/macros.h

 #define NEAR(x,y) NEAR_ZERO((x)-(y))
 
 #define RECIPROCAL(x) (NEAR_ZERO(x) ? 0 : (1 / float(x)))
-#define FIXFLOAT(f)  ({__typeof__(f) _f = (f); _f + (_f < 0 ? -0.00005f : 0.00005f);})
+#define FIXFLOAT(f)  ({__typeof__(f) _f = (f); _f + (_f < 0 ? -0.0000005f : 0.0000005f);})
 
 //
 // Maths macros that can be overridden by HAL

Marlin/src/core/serial.cpp

 void serial_echopair_PGM(PGM_P const s_P, char v)          { serialprintPGM(s_P); SERIAL_CHAR(v); }
 void serial_echopair_PGM(PGM_P const s_P, int v)           { serialprintPGM(s_P); SERIAL_ECHO(v); }
 void serial_echopair_PGM(PGM_P const s_P, long v)          { serialprintPGM(s_P); SERIAL_ECHO(v); }
-void serial_echopair_PGM(PGM_P const s_P, float v)         { serialprintPGM(s_P); SERIAL_ECHO(v); }
-void serial_echopair_PGM(PGM_P const s_P, double v)        { serialprintPGM(s_P); SERIAL_ECHO(v); }
+void serial_echopair_PGM(PGM_P const s_P, float v)         { serialprintPGM(s_P); SERIAL_DECIMAL(v); }
+void serial_echopair_PGM(PGM_P const s_P, double v)        { serialprintPGM(s_P); SERIAL_DECIMAL(v); }
 void serial_echopair_PGM(PGM_P const s_P, unsigned int v)  { serialprintPGM(s_P); SERIAL_ECHO(v); }
 void serial_echopair_PGM(PGM_P const s_P, unsigned long v) { serialprintPGM(s_P); SERIAL_ECHO(v); }
 

Marlin/src/core/serial.h

 
 #define SERIAL_ECHO_TERNARY(TF, PRE, ON, OFF, POST) serial_ternary(TF, PSTR(PRE), PSTR(ON), PSTR(OFF), PSTR(POST))
 
+#if SERIAL_FLOAT_PRECISION
+  #define SERIAL_DECIMAL(V) SERIAL_PRINT(V, SERIAL_FLOAT_PRECISION)
+#else
+  #define SERIAL_DECIMAL(V) SERIAL_ECHO(V)
+#endif
+
 //
 // Functions for serial printing from PROGMEM. (Saves loads of SRAM.)
 //

Marlin/src/core/utility.cpp

         #if ABL_PLANAR
           SERIAL_ECHOPGM("ABL Adjustment X");
           LOOP_XYZ(a) {
-            float v = planner.get_axis_position_mm(AxisEnum(a)) - current_position[a];
+            const float v = planner.get_axis_position_mm(AxisEnum(a)) - current_position[a];
             SERIAL_CHAR(' ', XYZ_CHAR(a));
             if (v > 0) SERIAL_CHAR('+');
-            SERIAL_ECHO(v);
+            SERIAL_DECIMAL(v);
           }
         #else
           #if ENABLED(AUTO_BED_LEVELING_UBL)

Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp

             if (g29_verbose_level > 1) {
               SERIAL_ECHOPAIR("Probing around (", g29_pos.x);
               SERIAL_CHAR(',');
-              SERIAL_ECHO(g29_pos.y);
+              SERIAL_DECIMAL(g29_pos.y);
               SERIAL_ECHOLNPGM(").\n");
             }
             const xy_pos_t near_probe_xy = g29_pos + probe.offset_xy;

Marlin/src/feature/encoder_i2c.cpp

           SERIAL_ECHOLNPAIR("New zero-offset of ", zeroOffset);
           SERIAL_ECHOPAIR("New position reads as ", get_position());
           SERIAL_CHAR('(');
-          SERIAL_ECHO(mm_from_count(get_position()));
+          SERIAL_DECIMAL(mm_from_count(get_position()));
           SERIAL_ECHOLNPGM(")");
         #endif
       }

Marlin/src/feature/encoder_i2c.h

     static void set_ec_threshold(const int8_t idx, const float newThreshold, const AxisEnum axis) {
       CHECK_IDX();
       encoders[idx].set_ec_threshold(newThreshold);
-      SERIAL_ECHOLNPAIR("Error correct threshold for ", axis_codes[axis], " axis set to ", FIXFLOAT(newThreshold), "mm.");
+      SERIAL_ECHOLNPAIR("Error correct threshold for ", axis_codes[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_ECHOLNPAIR("Error correct threshold for ", axis_codes[axis], " axis is ", FIXFLOAT(threshold), "mm.");
+      SERIAL_ECHOLNPAIR("Error correct threshold for ", axis_codes[axis], " axis is ", threshold, "mm.");
     }
 
     static int8_t idx_from_axis(const AxisEnum axis) {

Marlin/src/feature/powerloss.cpp

         DEBUG_ECHOPGM("current_position: ");
         LOOP_XYZE(i) {
           if (i) DEBUG_CHAR(',');
-          DEBUG_ECHO(info.current_position[i]);
+          DEBUG_DECIMAL(info.current_position[i]);
         }
         DEBUG_EOL();
 
           DEBUG_ECHOPGM("home_offset: ");
           LOOP_XYZ(i) {
             if (i) DEBUG_CHAR(',');
-            DEBUG_ECHO(info.home_offset[i]);
+            DEBUG_DECIMAL(info.home_offset[i]);
           }
           DEBUG_EOL();
         #endif
           DEBUG_ECHOPGM("position_shift: ");
           LOOP_XYZ(i) {
             if (i) DEBUG_CHAR(',');
-            DEBUG_ECHO(info.position_shift[i]);
+            DEBUG_DECIMAL(info.position_shift[i]);
           }
           DEBUG_EOL();
         #endif

Marlin/src/gcode/config/M92.cpp

       if (wanted) {
         const float best = uint16_t(wanted / z_full_step_mm) * z_full_step_mm;
         SERIAL_ECHOPAIR(", best:[", best);
-        if (best != wanted) { SERIAL_CHAR(','); SERIAL_ECHO(best + z_full_step_mm); }
+        if (best != wanted) { SERIAL_CHAR(','); SERIAL_DECIMAL(best + z_full_step_mm); }
         SERIAL_CHAR(']');
       }
       SERIAL_ECHOLNPGM(" }");

Marlin/src/gcode/feature/advance/M900.cpp

         SERIAL_ECHOPGM("Advance K");
         LOOP_L_N(i, EXTRUDERS) {
           SERIAL_CHAR(' ', '0' + i, ':');
-          SERIAL_ECHO(planner.extruder_advance_K[i]);
+          SERIAL_DECIMAL(planner.extruder_advance_K[i]);
         }
         SERIAL_EOL();
       #endif

Marlin/src/gcode/probe/G30.cpp

   const ProbePtRaise raise_after = parser.boolval('E', true) ? PROBE_PT_STOW : PROBE_PT_NONE;
   const float measured_z = probe.probe_at_point(pos, raise_after, 1);
   if (!isnan(measured_z))
-    SERIAL_ECHOLNPAIR("Bed X: ", FIXFLOAT(pos.x), " Y: ", FIXFLOAT(pos.y), " Z: ", FIXFLOAT(measured_z));
+    SERIAL_ECHOLNPAIR("Bed X: ", pos.x, " Y: ", pos.y, " Z: ", measured_z);
 
   restore_feedrate_and_scaling();
 

Marlin/src/module/probe.cpp

     else if (raise_after == PROBE_PT_STOW)
       if (stow()) measured_z = NAN;   // Error on stow?
 
-    if (verbose_level > 2) {
-      SERIAL_ECHOPAIR_F("Bed X: ", LOGICAL_X_POSITION(rx), 3);
-      SERIAL_ECHOPAIR_F(   " Y: ", LOGICAL_Y_POSITION(ry), 3);
-      SERIAL_ECHOLNPAIR_F( " Z: ", measured_z, 3);
-    }
+    if (verbose_level > 2)
+      SERIAL_ECHOLNPAIR("Bed X: ", LOGICAL_X_POSITION(rx), " Y: ", LOGICAL_Y_POSITION(ry), " Z: ", measured_z);
   }
 
   feedrate_mm_s = old_feedrate_mm_s;