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diff --git a/Marlin/src/core/serial.h b/Marlin/src/core/serial.h
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#include "../inc/MarlinConfig.h"
+#include "serial_hook.h"
+
+// Commonly-used strings in serial output
+extern const char NUL_STR[], SP_P_STR[], SP_T_STR[],
+                  X_STR[], Y_STR[], Z_STR[], E_STR[],
+                  X_LBL[], Y_LBL[], Z_LBL[], E_LBL[],
+                  SP_A_STR[], SP_B_STR[], SP_C_STR[],
+                  SP_X_STR[], SP_Y_STR[], SP_Z_STR[], SP_E_STR[],
+                  SP_X_LBL[], SP_Y_LBL[], SP_Z_LBL[], SP_E_LBL[];
+
+//
+// Debugging flags for use by M111
+//
+enum MarlinDebugFlags : uint8_t {
+  MARLIN_DEBUG_NONE          = 0,
+  MARLIN_DEBUG_ECHO          = _BV(0), ///< Echo commands in order as they are processed
+  MARLIN_DEBUG_INFO          = _BV(1), ///< Print messages for code that has debug output
+  MARLIN_DEBUG_ERRORS        = _BV(2), ///< Not implemented
+  MARLIN_DEBUG_DRYRUN        = _BV(3), ///< Ignore temperature setting and E movement commands
+  MARLIN_DEBUG_COMMUNICATION = _BV(4), ///< Not implemented
+  #if ENABLED(DEBUG_LEVELING_FEATURE)
+    MARLIN_DEBUG_LEVELING    = _BV(5), ///< Print detailed output for homing and leveling
+    MARLIN_DEBUG_MESH_ADJUST = _BV(6), ///< UBL bed leveling
+  #else
+    MARLIN_DEBUG_LEVELING    = 0,
+    MARLIN_DEBUG_MESH_ADJUST = 0,
+  #endif
+  MARLIN_DEBUG_ALL           = 0xFF
+};
+
+extern uint8_t marlin_debug_flags;
+#define DEBUGGING(F) (marlin_debug_flags & (MARLIN_DEBUG_## F))
+
+//
+// Serial redirection
+//
+typedef int8_t serial_index_t;
+#define SERIAL_ALL 0x7F
+#if HAS_MULTI_SERIAL
+  #define _PORT_REDIRECT(n,p)   REMEMBER(n,multiSerial.portMask,p)
+  #define SERIAL_ASSERT(P)      if(multiSerial.portMask!=(P)){ debugger(); }
+  #ifdef SERIAL_CATCHALL
+    typedef MultiSerial<decltype(MYSERIAL), decltype(SERIAL_CATCHALL), 0> SerialOutputT;
+  #else
+    typedef MultiSerial<decltype(MYSERIAL0), TERN(HAS_ETHERNET, ConditionalSerial<decltype(MYSERIAL1)>, decltype(MYSERIAL1)), 0>      SerialOutputT;
+  #endif
+  extern SerialOutputT          multiSerial;
+  #define SERIAL_IMPL           multiSerial
+#else
+  #define _PORT_REDIRECT(n,p)   NOOP
+  #define SERIAL_ASSERT(P)      NOOP
+  #define SERIAL_IMPL           MYSERIAL0
+#endif
+
+#define SERIAL_OUT(WHAT, V...)  (void)SERIAL_IMPL.WHAT(V)
+
+#define PORT_REDIRECT(p)        _PORT_REDIRECT(1,p)
+#define SERIAL_PORTMASK(P)      _BV(P)
+
+#define SERIAL_ECHO(x)          SERIAL_OUT(print, x)
+#define SERIAL_ECHO_F(V...)     SERIAL_OUT(print, V)
+#define SERIAL_ECHOLN(x)        SERIAL_OUT(println, x)
+#define SERIAL_PRINT(x,b)       SERIAL_OUT(print, x, b)
+#define SERIAL_PRINTLN(x,b)     SERIAL_OUT(println, x, b)
+#define SERIAL_FLUSH()          SERIAL_OUT(flush)
+
+#ifdef ARDUINO_ARCH_STM32
+  #define SERIAL_FLUSHTX()      SERIAL_OUT(flush)
+#elif TX_BUFFER_SIZE > 0
+  #define SERIAL_FLUSHTX()      SERIAL_OUT(flushTX)
+#else
+  #define SERIAL_FLUSHTX()
+#endif
+
+// Print up to 10 chars from a list
+#define __CHAR_N(N,V...)  _CHAR_##N(V)
+#define _CHAR_N(N,V...)   __CHAR_N(N,V)
+#define _CHAR_1(c)        SERIAL_OUT(write, c)
+#define _CHAR_2(a,b)      do{ _CHAR_1(a); _CHAR_1(b); }while(0)
+#define _CHAR_3(a,V...)   do{ _CHAR_1(a); _CHAR_2(V); }while(0)
+#define _CHAR_4(a,V...)   do{ _CHAR_1(a); _CHAR_3(V); }while(0)
+#define _CHAR_5(a,V...)   do{ _CHAR_1(a); _CHAR_4(V); }while(0)
+#define _CHAR_6(a,V...)   do{ _CHAR_1(a); _CHAR_5(V); }while(0)
+#define _CHAR_7(a,V...)   do{ _CHAR_1(a); _CHAR_6(V); }while(0)
+#define _CHAR_8(a,V...)   do{ _CHAR_1(a); _CHAR_7(V); }while(0)
+#define _CHAR_9(a,V...)   do{ _CHAR_1(a); _CHAR_8(V); }while(0)
+#define _CHAR_10(a,V...)  do{ _CHAR_1(a); _CHAR_9(V); }while(0)
+
+#define SERIAL_CHAR(V...) _CHAR_N(NUM_ARGS(V),V)
+
+// Print up to 12 pairs of values. Odd elements auto-wrapped in PSTR().
+#define __SEP_N(N,V...)   _SEP_##N(V)
+#define _SEP_N(N,V...)    __SEP_N(N,V)
+#define _SEP_1(PRE)       SERIAL_ECHOPGM(PRE)
+#define _SEP_2(PRE,V)     serial_echopair_PGM(PSTR(PRE),V)
+#define _SEP_3(a,b,c)     do{ _SEP_2(a,b); SERIAL_ECHOPGM(c); }while(0)
+#define _SEP_4(a,b,V...)  do{ _SEP_2(a,b); _SEP_2(V); }while(0)
+#define _SEP_5(a,b,V...)  do{ _SEP_2(a,b); _SEP_3(V); }while(0)
+#define _SEP_6(a,b,V...)  do{ _SEP_2(a,b); _SEP_4(V); }while(0)
+#define _SEP_7(a,b,V...)  do{ _SEP_2(a,b); _SEP_5(V); }while(0)
+#define _SEP_8(a,b,V...)  do{ _SEP_2(a,b); _SEP_6(V); }while(0)
+#define _SEP_9(a,b,V...)  do{ _SEP_2(a,b); _SEP_7(V); }while(0)
+#define _SEP_10(a,b,V...) do{ _SEP_2(a,b); _SEP_8(V); }while(0)
+#define _SEP_11(a,b,V...) do{ _SEP_2(a,b); _SEP_9(V); }while(0)
+#define _SEP_12(a,b,V...) do{ _SEP_2(a,b); _SEP_10(V); }while(0)
+#define _SEP_13(a,b,V...) do{ _SEP_2(a,b); _SEP_11(V); }while(0)
+#define _SEP_14(a,b,V...) do{ _SEP_2(a,b); _SEP_12(V); }while(0)
+#define _SEP_15(a,b,V...) do{ _SEP_2(a,b); _SEP_13(V); }while(0)
+#define _SEP_16(a,b,V...) do{ _SEP_2(a,b); _SEP_14(V); }while(0)
+#define _SEP_17(a,b,V...) do{ _SEP_2(a,b); _SEP_15(V); }while(0)
+#define _SEP_18(a,b,V...) do{ _SEP_2(a,b); _SEP_16(V); }while(0)
+#define _SEP_19(a,b,V...) do{ _SEP_2(a,b); _SEP_17(V); }while(0)
+#define _SEP_20(a,b,V...) do{ _SEP_2(a,b); _SEP_18(V); }while(0)
+#define _SEP_21(a,b,V...) do{ _SEP_2(a,b); _SEP_19(V); }while(0)
+#define _SEP_22(a,b,V...) do{ _SEP_2(a,b); _SEP_20(V); }while(0)
+#define _SEP_23(a,b,V...) do{ _SEP_2(a,b); _SEP_21(V); }while(0)
+#define _SEP_24(a,b,V...) do{ _SEP_2(a,b); _SEP_22(V); }while(0)
+
+#define SERIAL_ECHOPAIR(V...) _SEP_N(NUM_ARGS(V),V)
+
+// Print up to 12 pairs of values. Odd elements must be PSTR pointers.
+#define __SEP_N_P(N,V...)   _SEP_##N##_P(V)
+#define _SEP_N_P(N,V...)    __SEP_N_P(N,V)
+#define _SEP_1_P(PRE)       serialprintPGM(PRE)
+#define _SEP_2_P(PRE,V)     serial_echopair_PGM(PRE,V)
+#define _SEP_3_P(a,b,c)     do{ _SEP_2_P(a,b); serialprintPGM(c); }while(0)
+#define _SEP_4_P(a,b,V...)  do{ _SEP_2_P(a,b); _SEP_2_P(V); }while(0)
+#define _SEP_5_P(a,b,V...)  do{ _SEP_2_P(a,b); _SEP_3_P(V); }while(0)
+#define _SEP_6_P(a,b,V...)  do{ _SEP_2_P(a,b); _SEP_4_P(V); }while(0)
+#define _SEP_7_P(a,b,V...)  do{ _SEP_2_P(a,b); _SEP_5_P(V); }while(0)
+#define _SEP_8_P(a,b,V...)  do{ _SEP_2_P(a,b); _SEP_6_P(V); }while(0)
+#define _SEP_9_P(a,b,V...)  do{ _SEP_2_P(a,b); _SEP_7_P(V); }while(0)
+#define _SEP_10_P(a,b,V...) do{ _SEP_2_P(a,b); _SEP_8_P(V); }while(0)
+#define _SEP_11_P(a,b,V...) do{ _SEP_2_P(a,b); _SEP_9_P(V); }while(0)
+#define _SEP_12_P(a,b,V...) do{ _SEP_2_P(a,b); _SEP_10_P(V); }while(0)
+#define _SEP_13_P(a,b,V...) do{ _SEP_2_P(a,b); _SEP_11_P(V); }while(0)
+#define _SEP_14_P(a,b,V...) do{ _SEP_2_P(a,b); _SEP_12_P(V); }while(0)
+#define _SEP_15_P(a,b,V...) do{ _SEP_2_P(a,b); _SEP_13_P(V); }while(0)
+#define _SEP_16_P(a,b,V...) do{ _SEP_2_P(a,b); _SEP_14_P(V); }while(0)
+#define _SEP_17_P(a,b,V...) do{ _SEP_2_P(a,b); _SEP_15_P(V); }while(0)
+#define _SEP_18_P(a,b,V...) do{ _SEP_2_P(a,b); _SEP_16_P(V); }while(0)
+#define _SEP_19_P(a,b,V...) do{ _SEP_2_P(a,b); _SEP_17_P(V); }while(0)
+#define _SEP_20_P(a,b,V...) do{ _SEP_2_P(a,b); _SEP_18_P(V); }while(0)
+#define _SEP_21_P(a,b,V...) do{ _SEP_2_P(a,b); _SEP_19_P(V); }while(0)
+#define _SEP_22_P(a,b,V...) do{ _SEP_2_P(a,b); _SEP_20_P(V); }while(0)
+#define _SEP_23_P(a,b,V...) do{ _SEP_2_P(a,b); _SEP_21_P(V); }while(0)
+#define _SEP_24_P(a,b,V...) do{ _SEP_2_P(a,b); _SEP_22_P(V); }while(0)
+
+#define SERIAL_ECHOPAIR_P(V...) _SEP_N_P(NUM_ARGS(V),V)
+
+// Print up to 12 pairs of values followed by newline
+#define __SELP_N(N,V...)   _SELP_##N(V)
+#define _SELP_N(N,V...)    __SELP_N(N,V)
+#define _SELP_1(PRE)       SERIAL_ECHOLNPGM(PRE)
+#define _SELP_2(PRE,V)     do{ serial_echopair_PGM(PSTR(PRE),V); SERIAL_EOL(); }while(0)
+#define _SELP_3(a,b,c)     do{ _SEP_2(a,b); SERIAL_ECHOLNPGM(c); }while(0)
+#define _SELP_4(a,b,V...)  do{ _SEP_2(a,b); _SELP_2(V); }while(0)
+#define _SELP_5(a,b,V...)  do{ _SEP_2(a,b); _SELP_3(V); }while(0)
+#define _SELP_6(a,b,V...)  do{ _SEP_2(a,b); _SELP_4(V); }while(0)
+#define _SELP_7(a,b,V...)  do{ _SEP_2(a,b); _SELP_5(V); }while(0)
+#define _SELP_8(a,b,V...)  do{ _SEP_2(a,b); _SELP_6(V); }while(0)
+#define _SELP_9(a,b,V...)  do{ _SEP_2(a,b); _SELP_7(V); }while(0)
+#define _SELP_10(a,b,V...) do{ _SEP_2(a,b); _SELP_8(V); }while(0)
+#define _SELP_11(a,b,V...) do{ _SEP_2(a,b); _SELP_9(V); }while(0)
+#define _SELP_12(a,b,V...) do{ _SEP_2(a,b); _SELP_10(V); }while(0)
+#define _SELP_13(a,b,V...) do{ _SEP_2(a,b); _SELP_11(V); }while(0)
+#define _SELP_14(a,b,V...) do{ _SEP_2(a,b); _SELP_12(V); }while(0)
+#define _SELP_15(a,b,V...) do{ _SEP_2(a,b); _SELP_13(V); }while(0)
+#define _SELP_16(a,b,V...) do{ _SEP_2(a,b); _SELP_14(V); }while(0)
+#define _SELP_17(a,b,V...) do{ _SEP_2(a,b); _SELP_15(V); }while(0)
+#define _SELP_18(a,b,V...) do{ _SEP_2(a,b); _SELP_16(V); }while(0)
+#define _SELP_19(a,b,V...) do{ _SEP_2(a,b); _SELP_17(V); }while(0)
+#define _SELP_20(a,b,V...) do{ _SEP_2(a,b); _SELP_18(V); }while(0)
+#define _SELP_21(a,b,V...) do{ _SEP_2(a,b); _SELP_19(V); }while(0)
+#define _SELP_22(a,b,V...) do{ _SEP_2(a,b); _SELP_20(V); }while(0)
+#define _SELP_23(a,b,V...) do{ _SEP_2(a,b); _SELP_21(V); }while(0)
+#define _SELP_24(a,b,V...) do{ _SEP_2(a,b); _SELP_22(V); }while(0)
+#define _SELP_25(a,b,V...) do{ _SEP_2(a,b); _SELP_23(V); }while(0)
+#define _SELP_26(a,b,V...) do{ _SEP_2(a,b); _SELP_24(V); }while(0)
+#define _SELP_27(a,b,V...) do{ _SEP_2(a,b); _SELP_25(V); }while(0)
+#define _SELP_28(a,b,V...) do{ _SEP_2(a,b); _SELP_26(V); }while(0)
+#define _SELP_29(a,b,V...) do{ _SEP_2(a,b); _SELP_27(V); }while(0)
+#define _SELP_30(a,b,V...) do{ _SEP_2(a,b); _SELP_28(V); }while(0) // Eat two args, pass the rest up
+
+#define SERIAL_ECHOLNPAIR(V...) _SELP_N(NUM_ARGS(V),V)
+
+// Print up to 12 pairs of values followed by newline
+#define __SELP_N_P(N,V...)   _SELP_##N##_P(V)
+#define _SELP_N_P(N,V...)    __SELP_N_P(N,V)
+#define _SELP_1_P(PRE)       serialprintPGM(PRE)
+#define _SELP_2_P(PRE,V)     do{ serial_echopair_PGM(PRE,V); SERIAL_EOL(); }while(0)
+#define _SELP_3_P(a,b,c)     do{ _SEP_2_P(a,b); serialprintPGM(c); }while(0)
+#define _SELP_4_P(a,b,V...)  do{ _SEP_2_P(a,b); _SELP_2_P(V); }while(0)
+#define _SELP_5_P(a,b,V...)  do{ _SEP_2_P(a,b); _SELP_3_P(V); }while(0)
+#define _SELP_6_P(a,b,V...)  do{ _SEP_2_P(a,b); _SELP_4_P(V); }while(0)
+#define _SELP_7_P(a,b,V...)  do{ _SEP_2_P(a,b); _SELP_5_P(V); }while(0)
+#define _SELP_8_P(a,b,V...)  do{ _SEP_2_P(a,b); _SELP_6_P(V); }while(0)
+#define _SELP_9_P(a,b,V...)  do{ _SEP_2_P(a,b); _SELP_7_P(V); }while(0)
+#define _SELP_10_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_8_P(V); }while(0)
+#define _SELP_11_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_9_P(V); }while(0)
+#define _SELP_12_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_10_P(V); }while(0)
+#define _SELP_13_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_11_P(V); }while(0)
+#define _SELP_14_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_12_P(V); }while(0)
+#define _SELP_15_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_13_P(V); }while(0)
+#define _SELP_16_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_14_P(V); }while(0)
+#define _SELP_17_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_15_P(V); }while(0)
+#define _SELP_18_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_16_P(V); }while(0)
+#define _SELP_19_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_17_P(V); }while(0)
+#define _SELP_20_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_18_P(V); }while(0)
+#define _SELP_21_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_19_P(V); }while(0)
+#define _SELP_22_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_20_P(V); }while(0)
+#define _SELP_23_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_21_P(V); }while(0)
+#define _SELP_24_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_22_P(V); }while(0)
+#define _SELP_25_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_23_P(V); }while(0)
+#define _SELP_26_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_24_P(V); }while(0)
+#define _SELP_27_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_25_P(V); }while(0)
+#define _SELP_28_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_26_P(V); }while(0)
+#define _SELP_29_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_27_P(V); }while(0)
+#define _SELP_30_P(a,b,V...) do{ _SEP_2_P(a,b); _SELP_28_P(V); }while(0) // Eat two args, pass the rest up
+
+#define SERIAL_ECHOLNPAIR_P(V...) _SELP_N_P(NUM_ARGS(V),V)
+
+// Print up to 20 comma-separated pairs of values
+#define __SLST_N(N,V...)   _SLST_##N(V)
+#define _SLST_N(N,V...)    __SLST_N(N,V)
+#define _SLST_1(a)         SERIAL_ECHO(a)
+#define _SLST_2(a,b)       do{ SERIAL_ECHO(a); SERIAL_ECHOPAIR(", ",b);     }while(0)
+#define _SLST_3(a,b,c)     do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_1(c);  }while(0)
+#define _SLST_4(a,b,V...)  do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_2(V);  }while(0)
+#define _SLST_5(a,b,V...)  do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_3(V);  }while(0)
+#define _SLST_6(a,b,V...)  do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_4(V);  }while(0)
+#define _SLST_7(a,b,V...)  do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_5(V);  }while(0)
+#define _SLST_8(a,b,V...)  do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_6(V);  }while(0)
+#define _SLST_9(a,b,V...)  do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_7(V);  }while(0)
+#define _SLST_10(a,b,V...) do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_8(V);  }while(0)
+#define _SLST_11(a,b,V...) do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_9(V);  }while(0)
+#define _SLST_12(a,b,V...) do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_10(V); }while(0)
+#define _SLST_13(a,b,V...) do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_11(V); }while(0)
+#define _SLST_14(a,b,V...) do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_12(V); }while(0)
+#define _SLST_15(a,b,V...) do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_13(V); }while(0)
+#define _SLST_16(a,b,V...) do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_14(V); }while(0)
+#define _SLST_17(a,b,V...) do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_15(V); }while(0)
+#define _SLST_18(a,b,V...) do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_16(V); }while(0)
+#define _SLST_19(a,b,V...) do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_17(V); }while(0)
+#define _SLST_20(a,b,V...) do{ SERIAL_ECHO(a); _SEP_2(", ",b); _SLST_18(V); }while(0) // Eat two args, pass the rest up
+
+#define SERIAL_ECHOLIST(pre,V...)   do{ SERIAL_ECHOPGM(pre); _SLST_N(NUM_ARGS(V),V); }while(0)
+#define SERIAL_ECHOLIST_N(N,V...)   _SLST_N(N,LIST_N(N,V))
+
+#define SERIAL_ECHOPGM_P(P)         (serialprintPGM(P))
+#define SERIAL_ECHOLNPGM_P(P)       (serialprintPGM(P "\n"))
+
+#define SERIAL_ECHOPGM(S)           (serialprintPGM(PSTR(S)))
+#define SERIAL_ECHOLNPGM(S)         (serialprintPGM(PSTR(S "\n")))
+
+#define SERIAL_ECHOPAIR_F_P(P,V...) do{ serialprintPGM(P); SERIAL_ECHO_F(V); }while(0)
+#define SERIAL_ECHOLNPAIR_F_P(V...) do{ SERIAL_ECHOPAIR_F_P(V); SERIAL_EOL(); }while(0)
+
+#define SERIAL_ECHOPAIR_F(S,V...)   SERIAL_ECHOPAIR_F_P(PSTR(S),V)
+#define SERIAL_ECHOLNPAIR_F(V...)   do{ SERIAL_ECHOPAIR_F(V); SERIAL_EOL(); }while(0)
+
+#define SERIAL_ECHO_START()         serial_echo_start()
+#define SERIAL_ERROR_START()        serial_error_start()
+#define SERIAL_EOL()                SERIAL_CHAR('\n')
+
+#define SERIAL_ECHO_MSG(V...)       do{ SERIAL_ECHO_START(); SERIAL_ECHOLNPAIR(V); }while(0)
+#define SERIAL_ERROR_MSG(V...)      do{ SERIAL_ERROR_START(); SERIAL_ECHOLNPAIR(V); }while(0)
+
+#define SERIAL_ECHO_SP(C)           serial_spaces(C)
+
+#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.)
+//
+void serial_echopair_PGM(PGM_P const s_P, const char *v);
+void serial_echopair_PGM(PGM_P const s_P, char v);
+void serial_echopair_PGM(PGM_P const s_P, int v);
+void serial_echopair_PGM(PGM_P const s_P, unsigned int v);
+void serial_echopair_PGM(PGM_P const s_P, long v);
+void serial_echopair_PGM(PGM_P const s_P, unsigned long v);
+void serial_echopair_PGM(PGM_P const s_P, float v);
+void serial_echopair_PGM(PGM_P const s_P, double v);
+inline void serial_echopair_PGM(PGM_P const s_P, uint8_t v) { serial_echopair_PGM(s_P, (int)v); }
+inline void serial_echopair_PGM(PGM_P const s_P, bool v)    { serial_echopair_PGM(s_P, (int)v); }
+inline void serial_echopair_PGM(PGM_P const s_P, void *v)   { serial_echopair_PGM(s_P, (uintptr_t)v); }
+
+void serialprintPGM(PGM_P str);
+void serial_echo_start();
+void serial_error_start();
+void serial_ternary(const bool onoff, PGM_P const pre, PGM_P const on, PGM_P const off, PGM_P const post=nullptr);
+void serialprint_onoff(const bool onoff);
+void serialprintln_onoff(const bool onoff);
+void serialprint_truefalse(const bool tf);
+void serial_spaces(uint8_t count);
+
+void print_bin(const uint16_t val);
+void print_xyz(const float &x, const float &y, const float &z, PGM_P const prefix=nullptr, PGM_P const suffix=nullptr);
+
+inline void print_xyz(const xyz_pos_t &xyz, PGM_P const prefix=nullptr, PGM_P const suffix=nullptr) {
+  print_xyz(xyz.x, xyz.y, xyz.z, prefix, suffix);
+}
+
+#define SERIAL_POS(SUFFIX,VAR) do { print_xyz(VAR, PSTR("  " STRINGIFY(VAR) "="), PSTR(" : " SUFFIX "\n")); }while(0)
+#define SERIAL_XYZ(PREFIX,V...) do { print_xyz(V, PSTR(PREFIX), nullptr); }while(0)