From 01c90c940e8bde88acc514baee679ee6635ac57a Mon Sep 17 00:00:00 2001
From: Bjoern Kerler <info@revskills.de>
Date: Sat, 10 Feb 2024 19:07:21 +0100
Subject: [PATCH] Add gcode M27 auto report support

---
 lib/Marlin/Marlin/src/gcode/gcode.h         |  7 ++++++
 src/common/marlin_server.cpp                | 13 +++++++++++
 src/marlin_stubs/sdcard/M20-M30_M32-M34.cpp | 24 ++++++++++++++-------
 3 files changed, 36 insertions(+), 8 deletions(-)

diff --git a/lib/Marlin/Marlin/src/gcode/gcode.h b/lib/Marlin/Marlin/src/gcode/gcode.h
index c23a4a1870..e3cecd7244 100644
--- a/lib/Marlin/Marlin/src/gcode/gcode.h
+++ b/lib/Marlin/Marlin/src/gcode/gcode.h
@@ -308,6 +308,13 @@
 
 enum AxisRelative : uint8_t { REL_X, REL_Y, REL_Z, REL_E, E_MODE_ABS, E_MODE_REL };
 
+#if ENABLED(SDSUPPORT) || ENABLED(SDCARD_GCODES)
+namespace M27_handler {
+  extern uint32_t sd_auto_report_delay;
+  void print_sd_status();
+} // namespace M27_handler
+#endif
+
 class GcodeSuite {
 public:
 
diff --git a/src/common/marlin_server.cpp b/src/common/marlin_server.cpp
index 81d234234d..efaea7f339 100644
--- a/src/common/marlin_server.cpp
+++ b/src/common/marlin_server.cpp
@@ -566,6 +566,15 @@ void safely_unload_filament_from_nozzle_to_mmu() {
 }
 #endif
 
+void print_sd_report() {
+    static uint32_t last_sd_report = 0;
+    uint32_t current_time = ticks_s();
+    if (M27_handler::sd_auto_report_delay && (current_time - last_sd_report) >= M27_handler::sd_auto_report_delay) {
+        M27_handler::print_sd_status();
+        last_sd_report = current_time;
+    }
+}
+
 #ifdef MINDA_BROKEN_CABLE_DETECTION
 static void print_Z_probe_cnt() {
     if (DEBUGGING(INFO)) {
@@ -641,6 +650,10 @@ static void cycle() {
 
     print_fan_spd();
 
+#if ENABLED(SDSUPPORT) || ENABLED(SDCARD_GCODES)
+    print_sd_report();
+#endif
+
 #ifdef MINDA_BROKEN_CABLE_DETECTION
     print_Z_probe_cnt();
 #endif
diff --git a/src/marlin_stubs/sdcard/M20-M30_M32-M34.cpp b/src/marlin_stubs/sdcard/M20-M30_M32-M34.cpp
index fa525bc45b..4ecd8664d5 100644
--- a/src/marlin_stubs/sdcard/M20-M30_M32-M34.cpp
+++ b/src/marlin_stubs/sdcard/M20-M30_M32-M34.cpp
@@ -82,6 +82,19 @@ void GcodeSuite::M26() {
     }
 }
 
+uint32_t M27_handler::sd_auto_report_delay = 0;
+
+void M27_handler::print_sd_status() {
+    if (media_print_get_state() != media_print_state_NONE) {
+        SERIAL_ECHOPGM(MSG_SD_PRINTING_BYTE);
+        SERIAL_ECHO(media_print_get_position());
+        SERIAL_CHAR('/');
+        SERIAL_ECHOLN(media_print_get_size());
+    } else {
+        SERIAL_ECHOLNPGM(MSG_SD_NOT_PRINTING);
+    }
+}
+
 /**
  * M27 - Report SD print status on serial port
  *
@@ -93,15 +106,10 @@ void GcodeSuite::M27() {
     if (parser.seen('C')) {
         SERIAL_ECHOPGM("Current file: ");
         SERIAL_ECHOLN(marlin_vars()->media_SFN_path.get_ptr());
+    } else if (parser.seen('S')) {
+        M27_handler::sd_auto_report_delay = parser.byteval('S');
     } else {
-        if (media_print_get_state() != media_print_state_NONE) {
-            SERIAL_ECHOPGM(MSG_SD_PRINTING_BYTE);
-            SERIAL_ECHO(media_print_get_position());
-            SERIAL_CHAR('/');
-            SERIAL_ECHOLN(media_print_get_size());
-        } else {
-            SERIAL_ECHOLNPGM(MSG_SD_NOT_PRINTING);
-        }
+        M27_handler::print_sd_status();
     }
 }