Improve Power-loss Recovery (#15135)

Marlin/src/feature/power_loss_recovery.h

@@ -92,13 +92,9 @@ typedef struct {
   // Relative mode
   bool relative_mode, relative_modes_e;
 
-  // Command queue
-  uint8_t queue_length, queue_index_r;
-  char queue_buffer[BUFSIZE][MAX_CMD_SIZE];
-
   // SD Filename and position
   char sd_filename[MAXPATHNAMELENGTH];
-  uint32_t sdpos;
+  volatile uint32_t sdpos;
 
   // Job elapsed time
   millis_t print_job_elapsed;
@@ -114,7 +110,12 @@ class PrintJobRecovery {
     static SdFile file;
     static job_recovery_info_t info;
 
+    static uint8_t queue_index_r;     //!< Queue index of the active command
+    static uint32_t cmd_sdpos,        //!< SD position of the next command
+                    sdpos[BUFSIZE];   //!< SD positions of queued commands
+
     static void init();
+    static void prepare();
 
     static inline void setup() {
       #if PIN_EXISTS(POWER_LOSS)
@@ -130,6 +131,10 @@ class PrintJobRecovery {
       #endif
     }
 
+    // Track each command's file offsets
+    static inline uint32_t command_sdpos() { return sdpos[queue_index_r]; }
+    static inline void commit_sdpos(const uint8_t index_w) { sdpos[index_w] = cmd_sdpos; }
+
     static bool enabled;
     static void enable(const bool onoff);
     static void changed();
@@ -152,6 +157,13 @@ class PrintJobRecovery {
       , const bool save_queue=true
     );
 
+  #if PIN_EXISTS(POWER_LOSS)
+    static inline void outage() {
+      if (enabled && IS_SD_PRINTING() && READ(POWER_LOSS_PIN) == POWER_LOSS_STATE)
+        _outage();
+    }
+  #endif
+
   static inline bool valid() { return info.valid_head && info.valid_head == info.valid_foot; }
 
   #if ENABLED(DEBUG_POWER_LOSS_RECOVERY)
@@ -162,6 +174,10 @@ class PrintJobRecovery {
 
   private:
     static void write();
+
+  #if PIN_EXISTS(POWER_LOSS)
+    static void _outage();
+  #endif
 };
 
 extern PrintJobRecovery recovery;