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diff --git a/Marlin/src/gcode/feature/leds/M7219.cpp b/Marlin/src/gcode/feature/leds/M7219.cpp
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+++ b/Marlin/src/gcode/feature/leds/M7219.cpp
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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/>.
+ *
+ */
+
+#include "../../../inc/MarlinConfigPre.h"
+
+#if ENABLED(MAX7219_GCODE)
+
+#include "../../gcode.h"
+#include "../../../feature/max7219.h"
+
+/**
+ * M7219: Control the Max7219 LED matrix
+ *
+ *  I         - Initialize (clear) the matrix
+ *  F         - Fill the matrix (set all bits)
+ *  P         - Dump the led_line[] array values
+ *  C<column> - Set a column to the bitmask given by 'V' (Units 0-3 in portrait layout)
+ *  R<row>    - Set a row to the bitmask given by 'V' (Units 0-3 in landscape layout)
+ *  X<pos>    - X index of an LED to set or toggle
+ *  Y<pos>    - Y index of an LED to set or toggle
+ *  V<value>  - LED on/off state or row/column bitmask (8, 16, 24, or 32-bits)
+ *              ('C' / 'R' can be used to update up to 4 units at once)
+ *
+ * Directly set a native matrix row to the 8-bit value 'V':
+ *  D<line>   - Display line (0..7)
+ *  U<unit>   - Unit index (0..MAX7219_NUMBER_UNITS-1)
+ */
+void GcodeSuite::M7219() {
+  if (parser.seen('I')) {
+    max7219.register_setup();
+    max7219.clear();
+  }
+
+  if (parser.seen('F')) max7219.fill();
+
+  const uint32_t v = parser.ulongval('V');
+
+  if (parser.seenval('R')) {
+    const uint8_t r = parser.value_byte();
+    max7219.set_row(r, v);
+  }
+  else if (parser.seenval('C')) {
+    const uint8_t c = parser.value_byte();
+    max7219.set_column(c, v);
+  }
+  else if (parser.seenval('X') || parser.seenval('Y')) {
+    const uint8_t x = parser.byteval('X'), y = parser.byteval('Y');
+    if (parser.seenval('V'))
+      max7219.led_set(x, y, v > 0);
+    else
+      max7219.led_toggle(x, y);
+  }
+  else if (parser.seen('D')) {
+    const uint8_t uline = parser.value_byte() & 0x7,
+                  line = uline + (parser.byteval('U') << 3);
+    if (line < MAX7219_LINES) {
+      max7219.led_line[line] = v;
+      return max7219.refresh_line(line);
+    }
+  }
+
+  if (parser.seen('P')) {
+    LOOP_L_N(r, MAX7219_LINES) {
+      SERIAL_ECHOPGM("led_line[");
+      if (r < 10) SERIAL_CHAR(' ');
+      SERIAL_ECHO(int(r));
+      SERIAL_ECHOPGM("]=");
+      for (uint8_t b = 8; b--;) SERIAL_CHAR('0' + TEST(max7219.led_line[r], b));
+      SERIAL_EOL();
+    }
+  }
+}
+
+#endif // MAX7219_GCODE