Merge 2c133da140 into 6d8ca67a2b

Commented MAX_LOCOS
Lowered the default Max for Uno CS from 30 to 10

DCC.h

@@ -43,9 +43,9 @@ const uint16_t LONG_ADDR_MARKER = 0x4000;
 // Allocations with memory implications..!
 // Base system takes approx 900 bytes + 8 per loco. Turnouts, Sensors etc are dynamically created
 #if defined(HAS_ENOUGH_MEMORY)
-const byte MAX_LOCOS = 50;
-#else
-const byte MAX_LOCOS = 30;
+const byte MAX_LOCOS = 50;  // Default 50 for Mega2560,  Increase for ESP32 and STM32 Nucleo 
+#else                       // Adjust Max Locos as needed.
+const byte MAX_LOCOS = 10;  // Lower Max Loco for Uno CS, Recommended as a JMRI DecoderPro Programming Station 
 #endif
 
 class DCC

DCCEXParser.cpp

@@ -119,6 +119,7 @@ Once a new OPCODE is decided upon, update this list.
 #include "version.h"
 #include "KeywordHasher.h"
 #include "CamParser.h"
+#include "Stash.h"
 #ifdef ARDUINO_ARCH_ESP32
 #include "WifiESP32.h"
 #endif
@@ -777,7 +778,7 @@ void DCCEXParser::parseOne(Print *stream, byte *com, RingStream * ringStream)
 
     case 'J' : // throttle info access
         {
-            if ((params<1) | (params>3)) break; // <J>
+            if (params<1) break; // <J>
             //if ((params<1) | (params>2)) break; // <J>
             int16_t id=(params==2)?p[1]:0;
             switch(p[0]) {
@@ -801,7 +802,7 @@ void DCCEXParser::parseOne(Print *stream, byte *com, RingStream * ringStream)
                     return;
 
                 case "L"_hk: // <JL display row> track state and mA value on display
-                    if (params<3) break;
+                    if (params!=3) break;
                     TrackManager::reportCurrentLCD(p[1], p[2]);   // Track power status     
                     return;
 
@@ -810,11 +811,10 @@ void DCCEXParser::parseOne(Print *stream, byte *com, RingStream * ringStream)
                     StringFormatter::send(stream, F("<jA>\n"));
                     return;
  
-                case "M"_hk: // <JM> intercepted by EXRAIL
-                    if (params>1) break; // invalid cant do
-                    // <JM> requests stash size so say none.
-                    StringFormatter::send(stream,F("<jM 0>\n")); 
-                    return;
+                case "M"_hk: // <JM> Stash management
+                    if (parseJM(stream, params, p))
+                        return;
+                    break;
  
             case "R"_hk: // <JR> returns rosters 
                 StringFormatter::send(stream, F("<jR"));
@@ -1405,6 +1405,40 @@ bool DCCEXParser::parseI(Print *stream, int16_t params, int16_t p[])
 }
 #endif
 
+bool DCCEXParser::parseJM(Print *stream, int16_t params, int16_t p[]) {
+  switch (params) {
+    case 1: // <JM> list all stashed automations
+        Stash::list(stream);
+        return true; 
+        
+    case 2: // <JM id> get stash value 
+        Stash::list(stream, p[1]);
+        return true;
+
+    case 3: // 
+        if (p[1]=="CLEAR"_hk) {
+            if (p[2]=="ALL"_hk) { // <JM CLEAR ALL>
+                Stash::clearAll();
+                return true;
+            }
+            Stash::clear(p[2]); // <JM CLEAR id>
+            return true;
+        }
+        Stash::set(p[1], p[2]);  // <JM id loco>
+        return true;
+    
+    case 4: // <JM CLEAR ANY id>
+    if (p[1]=="CLEAR"_hk && p[2]=="ANY"_hk) { 
+        // <JM CLEAR ANY id>
+        Stash::clearAny(p[3]);
+        return true;
+    }
+    
+    default: break;
+}
+return false;
+}
+
 // CALLBACKS must be static
 bool DCCEXParser::stashCallback(Print *stream, int16_t p[MAX_COMMAND_PARAMS], RingStream * ringStream)
 {

DCCEXParser.h

@@ -52,6 +52,7 @@ struct DCCEXParser
     static bool parsef(Print * stream, int16_t params, int16_t p[]);
     static bool parseC(Print * stream, int16_t params, int16_t p[]);
     static bool parseD(Print * stream, int16_t params, int16_t p[]);
+    static bool parseJM(Print * stream, int16_t params, int16_t p[]);
 #ifndef IO_NO_HAL
     static bool parseI(Print * stream, int16_t params, int16_t p[]);
 #endif

EXRAIL2.cpp

@@ -57,6 +57,7 @@
 #include "Turntables.h"
 #include "IODevice.h"
 #include "EXRAILSensor.h"
+#include "Stash.h"
 
 
 // One instance of RMFT clas is used for each "thread" in the automation.
@@ -92,8 +93,7 @@ LookList *  RMFT2::onBlockEnterLookup=NULL;
 LookList *  RMFT2::onBlockExitLookup=NULL;
 byte * RMFT2::routeStateArray=nullptr; 
 const FSH  * * RMFT2::routeCaptionArray=nullptr; 
-int16_t * RMFT2::stashArray=nullptr;
-int16_t RMFT2::maxStashId=0;
+
 
 // getOperand instance version, uses progCounter from instance.
 uint16_t RMFT2::getOperand(byte n) {
@@ -258,13 +258,7 @@ LookList* RMFT2::LookListLoader(OPCODE op1, OPCODE op2, OPCODE op3) {
       IODevice::configureInput((VPIN)pin,true);
       break;
     }
-    case OPCODE_STASH:
-    case OPCODE_CLEAR_STASH:
-    case OPCODE_PICKUP_STASH: {
-      maxStashId=max(maxStashId,((int16_t)operand));
-      break;
-    }
-
+    
     case OPCODE_ATGTE:
     case OPCODE_ATLT:
     case OPCODE_IFGTE:
@@ -352,13 +346,7 @@ LookList* RMFT2::LookListLoader(OPCODE op1, OPCODE op2, OPCODE op3) {
   }
   SKIPOP; // include ENDROUTES opcode
   
-  if (compileFeatures & FEATURE_STASH) {
-    // create the stash array from the highest id found
-    if (maxStashId>0) stashArray=(int16_t*)calloc(maxStashId+1, sizeof(int16_t));
-     //TODO check EEPROM and fetch stashArray
-  }
-  
-  DIAG(F("EXRAIL %db, fl=%d, stash=%d"),progCounter,MAX_FLAGS, maxStashId);
+  DIAG(F("EXRAIL %db, fl=%d"),progCounter,MAX_FLAGS);
 
   // Removed for 4.2.31  new RMFT2(0); // add the startup route
   diag=saved_diag;
@@ -815,6 +803,10 @@ void RMFT2::loop2() {
   case OPCODE_IFCLOSED:
     skipIf=Turnout::isThrown(operand);
     break;
+    
+  case OPCODE_IFSTASH:
+    skipIf=Stash::get(operand)==0;
+    break;
 
 #ifndef IO_NO_HAL
   case OPCODE_IFTTPOSITION: // do block if turntable at this position
@@ -1067,30 +1059,32 @@ void RMFT2::loop2() {
     break;   
 
   case OPCODE_STASH:
-    if (compileFeatures & FEATURE_STASH) 
-      stashArray[operand] = invert? -loco : loco;
+    Stash::set(operand,invert? -loco : loco);
     break; 
 
   case OPCODE_CLEAR_STASH:
-    if (compileFeatures & FEATURE_STASH) 
-      stashArray[operand] = 0;
+    Stash::clear(operand);
     break; 
        
   case OPCODE_CLEAR_ALL_STASH:
-    if (compileFeatures & FEATURE_STASH) 
-      for (int i=0;i<=maxStashId;i++) stashArray[operand]=0;
+    Stash::clearAll();
+    break;
+
+  case OPCODE_CLEAR_ANY_STASH:
+    if (loco) Stash::clearAny(loco);
     break;
 
   case OPCODE_PICKUP_STASH:
-    if (compileFeatures & FEATURE_STASH) {
-      int16_t x=stashArray[operand];
-      if (x>=0) {
-        loco=x;
-        invert=false;
-        break;
-      }
-      loco=-x;
-      invert=true;
+      {
+        auto x=Stash::get(operand);
+        if (x>=0) {
+          loco=x;
+          invert=false;
+        }
+        else {
+          loco=-x;
+          invert=true;    
+        }
     }
     break;
   

EXRAIL2.h

@@ -77,6 +77,7 @@ enum OPCODE : byte {OPCODE_THROW,OPCODE_CLOSE,OPCODE_TOGGLE_TURNOUT,
              OPCODE_ROUTE_ACTIVE,OPCODE_ROUTE_INACTIVE,OPCODE_ROUTE_HIDDEN,
              OPCODE_ROUTE_DISABLED,
              OPCODE_STASH,OPCODE_CLEAR_STASH,OPCODE_CLEAR_ALL_STASH,OPCODE_PICKUP_STASH,
+             OPCODE_CLEAR_ANY_STASH,
              OPCODE_ONBUTTON,OPCODE_ONSENSOR,
              OPCODE_NEOPIXEL,
              OPCODE_ONBLOCKENTER,OPCODE_ONBLOCKEXIT,
@@ -93,7 +94,8 @@ enum OPCODE : byte {OPCODE_THROW,OPCODE_CLOSE,OPCODE_TOGGLE_TURNOUT,
              OPCODE_IFCLOSED,OPCODE_IFTHROWN,
              OPCODE_IFRE,
              OPCODE_IFLOCO,
-             OPCODE_IFTTPOSITION
+             OPCODE_IFTTPOSITION,
+             OPCODE_IFSTASH,
              };
 
 // Ensure thrunge_lcd is put last as there may be more than one display, 
@@ -137,7 +139,7 @@ enum SignalType {
   static const byte FEATURE_LCC   = 0x40;
   static const byte FEATURE_ROSTER= 0x20;
   static const byte FEATURE_ROUTESTATE= 0x10;
-  static const byte FEATURE_STASH = 0x08;
+  // spare = 0x08;
   static const byte FEATURE_BLINK = 0x04;
   static const byte FEATURE_SENSOR = 0x02;
   static const byte FEATURE_BLOCK = 0x01;

EXRAIL2MacroReset.h

@@ -46,6 +46,7 @@
 #undef CALL 
 #undef CLEAR_STASH
 #undef CLEAR_ALL_STASH
+#undef CLEAR_ANY_STASH
 #undef CLOSE 
 #undef CONFIGURE_SERVO
 #undef DCC_SIGNAL
@@ -88,6 +89,7 @@
 #undef IFRANDOM 
 #undef IFRED
 #undef IFRESERVE
+#undef IFSTASH
 #undef IFTHROWN
 #undef IFTIMEOUT
 #undef IFTTPOSITION
@@ -338,6 +340,11 @@
  * @brief Clears all stashed loco values
  */
 #define CLEAR_ALL_STASH
+/**
+* @def CLEAR_ANY_STASH
+* @brief Clears loco value from all stash entries
+*/
+#define CLEAR_ANY_STASH
 /**
  * @def CLOSE(turnout_id)
  * @brief Close turnout by id
@@ -602,6 +609,13 @@
  * @param signal_id 
  */
 #define IFRED(signal_id)
+/**
+ * @def IFSTASH(stash_id)
+ * @brief Checks if given stash entry has a non zero value
+ * @see IF
+ * @param stash_id 
+ */
+#define IFSTASH(stash_id) 
 /**
  * @def IFTHROWN(turnout_id)
  * @brief Checks if given turnout is in THROWN state

EXRAIL2Parser.cpp

@@ -181,36 +181,7 @@ void RMFT2::ComandFilter(Print * stream, byte & opcode, byte & paramCount, int16
               return;
             }
             break;
-        case "M"_hk:
-            // NOTE: we only need to handle valid calls here because 
-            // DCCEXParser has to have code to handle the <J<> cases where
-            // exrail isnt involved anyway. 
-            // This entire code block is compiled out if STASH macros not used 
-          if (!(compileFeatures & FEATURE_STASH)) return;
-          if (paramCount==1) { // <JM>
-              StringFormatter::send(stream,F("<jM %d>\n"),maxStashId);
-              opcode=0;
-              break;
-            } 
-          if (paramCount==2) {  // <JM id>
-              if (p[1]<=0 || p[1]>maxStashId) break;
-              StringFormatter::send(stream,F("<jM %d %d>\n"),
-                    p[1],stashArray[p[1]]);
-               opcode=0;     
-               break;    
-          } 
-          if (paramCount==3) {  // <JM id cab>
-              if (p[1]<=0 || p[1]>maxStashId) break;
-              stashArray[p[1]]=p[2];
-              opcode=0;
-              break;      
-          }
-          break; 
-
-        default:
-            break;
-        }
-	break;
+        
 
   case 'K': // <K blockid loco>  Block enter
   case 'k': // <k blockid loco>  Block exit
@@ -223,6 +194,7 @@ void RMFT2::ComandFilter(Print * stream, byte & opcode, byte & paramCount, int16
     break;
   }
 }
+}
 
 bool RMFT2::parseSlash(Print * stream, byte & paramCount, int16_t p[]) {
 
@@ -268,15 +240,6 @@ bool RMFT2::parseSlash(Print * stream, byte & paramCount, int16_t p[]) {
 			      slot.id);
       } 
     }
-
-    if (compileFeatures & FEATURE_STASH) {
-      for (int i=1;i<=maxStashId;i++) {
-        if (stashArray[i])
-          StringFormatter::send(stream,F("\nSTASH[%d] Loco=%d"),
-              i, stashArray[i]); 
-      } 
-    }
-    
     StringFormatter::send(stream,F(" *>\n"));
     return true;
   }

EXRAILAsserts.h

@@ -53,7 +53,7 @@ constexpr int16_t seqCount(const int16_t value, const int16_t pos=0, const int16
 #define new
 #define MotorDriver(power_pin,signal_pin,signal_pin2, \
    brake_pin,current_pin,senseFactor,tripMilliamps,faultPin) \
-   power_pin,signal_pin,signal_pin2,brake_pin,current_pin,faultPin
+   abs(power_pin),abs(signal_pin),abs(signal_pin2),abs(brake_pin),abs(current_pin),abs(faultPin)
 #ifndef PIN_BLACKLIST 
   #define PIN_BLACKLIST UNUSED_PIN
 #endif 
@@ -128,37 +128,38 @@ constexpr bool unsafePin(const int16_t value, const uint16_t pos=0 ) {
 
 //check speeds
 #undef SPEED
-#define SPEED(speed) static_assert(speed>=0 && speed<128,"Speed out of valid range 0-127");
+#define SPEED(speed) static_assert(speed>=0 && speed<128,"\n\nUSER ERROR: Speed out of valid range 0-127\n");
 #undef FWD
-#define FWD(speed) static_assert(speed>=0 && speed<128,"Speed out of valid range 0-127");
+#define FWD(speed) static_assert(speed>=0 && speed<128,"\n\nUSER ERROR: Speed out of valid range 0-127\n");
 #undef REV
-#define REV(speed) static_assert(speed>=0 && speed<128,"Speed out of valid range 0-127");
+#define REV(speed) static_assert(speed>=0 && speed<128,"\n\nUSER ERROR: Speed out of valid range 0-127\n");
 
 // check duplicate sequences
 #undef SEQUENCE
-#define SEQUENCE(id) static_assert(seqCount(id)==1,"Duplicate ROUTE/AUTOMATION/SEQUENCE " #id);
+#define SEQUENCE(id) static_assert(seqCount(id)==1,"\n\nUSER ERROR: Duplicate ROUTE/AUTOMATION/SEQUENCE(" #id ")\n");
 #undef AUTOMATION
-#define AUTOMATION(id,description) static_assert(seqCount(id)==1,"Duplicate ROUTE/AUTOMATION/SEQUENCE " #id);
+#define AUTOMATION(id,description) static_assert(seqCount(id)==1,"\n\nUSER ERROR: Duplicate ROUTE/AUTOMATION/SEQUENCE(" #id ")\n");
 #undef ROUTE
-#define ROUTE(id,description) static_assert(seqCount(id)==1,"Duplicate ROUTE/AUTOMATION/SEQUENCE " #id);
+#define ROUTE(id,description) static_assert(seqCount(id)==1,"\n\nUSER ERROR: Duplicate ROUTE/AUTOMATION/SEQUENCE(" #id ")\n");
 
 // check dangerous pins
+#define _PIN_RESERVED_ "\n\nUSER ERROR: Pin is used by Motor Shield or other critical function.\n"
 #undef SET
-#define SET(vpin) static_assert(!unsafePin(vpin),"SET(" #vpin ") not safe to use in EXRAIL");
+#define SET(vpin) static_assert(!unsafePin(vpin),"SET(" #vpin ")" _PIN_RESERVED_);
 #undef RESET
-#define RESET(vpin) static_assert(!unsafePin(vpin),"RESET(" #vpin ") not safe to use in EXRAIL");
+#define RESET(vpin) static_assert(!unsafePin(vpin),"RESET(" #vpin ")" _PIN_RESERVED_);
 #undef BLINK
-#define BLINK(vpin,onDuty,offDuty) static_assert(!unsafePin(vpin),"BLINK(" #vpin ") not safe to use in EXRAIL");
+#define BLINK(vpin,onDuty,offDuty) static_assert(!unsafePin(vpin),"BLINK(" #vpin ")" _PIN_RESERVED_);
 #undef SIGNAL
 #define SIGNAL(redpin,amberpin,greenpin) \
-      static_assert(!unsafePin(redpin),"RED " #redpin " not safe to use in EXRAIL"); \
-      static_assert(amberpin==0 ||!unsafePin(amberpin),"AMBER " #amberpin " not safe to use in EXRAIL"); \
-      static_assert(!unsafePin(greenpin),"GREEN " #greenpin " not safe to use in EXRAIL"); 
+      static_assert(!unsafePin(redpin),"Red pin " #redpin _PIN_RESERVED_); \
+      static_assert(amberpin==0 ||!unsafePin(amberpin),"Amber pin " #amberpin _PIN_RESERVED_); \
+      static_assert(!unsafePin(greenpin),"Green pin " #greenpin _PIN_RESERVED_); 
 #undef SIGNALH
 #define SIGNALH(redpin,amberpin,greenpin) \
-      static_assert(!unsafePin(redpin),"RED " #redpin " not safe to use in EXRAIL"); \
-      static_assert(amberpin==0 ||!unsafePin(amberpin),"AMBER " #amberpin " not safe to use in EXRAIL"); \
-      static_assert(!unsafePin(greenpin),"GREEN " #greenpin " not safe to use in EXRAIL"); 
+      static_assert(!unsafePin(redpin),"Red pin " #redpin _PIN_RESERVED_); \
+      static_assert(amberpin==0 ||!unsafePin(amberpin),"Amber pin " #amberpin _PIN_RESERVED_); \
+      static_assert(!unsafePin(greenpin),"Green pin " #greenpin _PIN_RESERVED_); 
 
 // and run the assert pass.       
 #include "myAutomation.h"

EXRAILMacros.h

@@ -154,14 +154,6 @@ bool exrailHalSetup() {
 #undef ROUTE_CAPTION
 #define ROUTE_CAPTION(id,caption) | FEATURE_ROUTESTATE
 
-#undef CLEAR_STASH
-#define CLEAR_STASH(id) | FEATURE_STASH
-#undef CLEAR_ALL_STASH
-#define CLEAR_ALL_STASH | FEATURE_STASH
-#undef PICKUP_STASH
-#define PICKUP_STASH(id) | FEATURE_STASH
-#undef STASH
-#define STASH(id) | FEATURE_STASH
 #undef BLINK
 #define BLINK(vpin,onDuty,offDuty) | FEATURE_BLINK
 #undef ONBUTTON
@@ -435,6 +427,7 @@ int RMFT2::onLCCLookup[RMFT2::countLCCLookup];
 #define CALL(route) OPCODE_CALL,V(route),
 #define CLEAR_STASH(id) OPCODE_CLEAR_STASH,V(id),
 #define CLEAR_ALL_STASH OPCODE_CLEAR_ALL_STASH,V(0),
+#define CLEAR_ANY_STASH OPCODE_CLEAR_ANY_STASH,V(0),
 #define CLOSE(id)  OPCODE_CLOSE,V(id),
 #define CONFIGURE_SERVO(vpin,pos1,pos2,profile)
 #ifndef IO_NO_HAL
@@ -481,6 +474,7 @@ int RMFT2::onLCCLookup[RMFT2::countLCCLookup];
 #define IFRANDOM(percent) OPCODE_IFRANDOM,V(percent),
 #define IFRED(signal_id) OPCODE_IFRED,V(signal_id),
 #define IFRESERVE(block) OPCODE_IFRESERVE,V(block),
+#define IFSTASH(stash_id) OPCODE_IFSTASH,V(stash_id),
 #define IFTHROWN(turnout_id) OPCODE_IFTHROWN,V(turnout_id),
 #define IFTIMEOUT OPCODE_IFTIMEOUT,0,0,
 #ifndef IO_NO_HAL

Release_Notes/Stash.md

@@ -0,0 +1,21 @@
+# The STASH feature of exrail.
+
+STASH is used for scenarios where it is helpful to relate a loco id to where it is parked. For example a fiddle yard may have 10 tracks and it's much easier for the operator to select a train to depart by using the track number, or pressing a button relating to that track, rather than by knowing the loco id which may be difficult to see.
+
+Automated yard parking can use the stash to determine which tracks are empty without the need for block occupancy detectors.
+
+Note that a negative locoid may be stashed to indicate that the loco will operate with inverted direction. For example a loco facing backwards, with the INVERT_DRECTION state may be stashed by exrail and the invert state will be restored along with the loco id when using the PICKUP_STASH.  CLEAR_ANY_STASH will clear all references to the loco regardless of direction. 
+
+The following Stash  commands are available:
+ | EXRAIL command | Serial protocol | function |
+ | -------------- | --------------- | -------- | 
+ | STASH(s) | `<JM s locoid>` | Save the current loco id in the stash array element s. |
+ | CLEAR_STASH(s) | `<JM s 0>` | Sets stash array element s to zero. |  
+ | CLEAR_ALL_STASH | `<JM CLEAR ALL>` | sets all stash entries to zero |
+ | CLEAR_ANY_STASH | `<JM CLEAR ANY locoid>` | removes current loco from all stash elements | 
+ | PICKUP_STASH(s) | N/A | sets current loco to stash element s |
+ | IFSTASH(s)  | N/A | True if stash element s is not zero |
+ | N/A | `<JM>`  | query all stashes (returns `<jM s loco>` where loco is not zero)
+ | N/A | `<JM stash>` | Query loco in stash (returns `<jM s loco>`)  
+
+

Stash.cpp

@@ -0,0 +1,89 @@
+/* 
+*  © 2024 Chris Harlow
+ *  All rights reserved.
+ *  
+ *  This file is part of DCC-EX
+ *
+ *  This 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.
+ *
+ *  It 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 CommandStation.  If not, see <https://www.gnu.org/licenses/>. 
+*/
+#include "Stash.h"
+#include "StringFormatter.h"
+
+Stash::Stash(int16_t stash_id, int16_t loco_id) {
+    this->stashId = stash_id;
+    this->locoId = loco_id;
+    this->next = first;
+    first = this;
+}
+
+void Stash::clearAll() {
+    for (auto s=first;s;s=s->next) {
+        s->locoId = 0;
+        s->stashId =0;
+    }
+}
+
+void Stash::clearAny(int16_t loco_id) {
+    auto lid=abs(loco_id);
+    for (auto s=first;s;s=s->next)
+        if (abs(s->locoId) == lid) {
+            s->locoId = 0;
+            s->stashId =0;
+        }
+}
+
+void Stash::clear(int16_t stash_id) {
+    set(stash_id,0);
+}
+
+int16_t Stash::get(int16_t stash_id) {
+    for (auto s=first;s;s=s->next)
+        if (s->stashId == stash_id) return s->locoId;
+    return 0;
+}
+
+void Stash::set(int16_t stash_id, int16_t loco_id) {
+    // replace any existing stash
+    for (auto s=first;s;s=s->next)
+        if (s->stashId == stash_id) {
+            s->locoId=loco_id;
+            if (loco_id==0) s->stashId=0; // recycle
+            return;
+        }
+    if (loco_id==0) return; // no need to create a zero entry.
+
+    // replace any empty stash 
+    for (auto s=first;s;s=s->next)
+        if (s->locoId == 0) {
+            s->locoId=loco_id;
+            s->stashId=stash_id;
+            return;
+        }
+    // create a new stash
+    new Stash(stash_id, loco_id);
+}
+ 
+void Stash::list(Print * stream, int16_t stash_id) {
+    bool sent=false;
+    for (auto s=first;s;s=s->next)
+      if ((s->locoId) && (stash_id==0 || s->stashId==stash_id)) {
+          StringFormatter::send(stream,F("<jM %d %d>\n"),
+            s->stashId,s->locoId);
+          sent=true;
+      }
+    if (!sent) StringFormatter::send(stream,F("<jM %d 0>\n"),
+          stash_id);
+}
+
+Stash* Stash::first=nullptr;

Stash.h

@@ -0,0 +1,39 @@
+/* 
+*  © 2024 Chris Harlow
+ *  All rights reserved.
+ *  
+ *  This file is part of DCC-EX
+ *
+ *  This 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.
+ *
+ *  It 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 CommandStation.  If not, see <https://www.gnu.org/licenses/>. 
+*/
+#ifndef Stash_h
+#define Stash_h
+#include <Arduino.h>
+
+class Stash {
+  public:
+    static void clear(int16_t stash_id);
+    static void clearAll();
+    static void clearAny(int16_t loco_id);
+    static int16_t get(int16_t stash_id);
+    static void set(int16_t stash_id, int16_t loco_id);
+    static void list(Print * stream, int16_t stash_id=0); // id0 = LIST ALL
+  private:
+    Stash(int16_t stash_id, int16_t loco_id);
+    static Stash* first;
+    Stash* next;
+    int16_t stashId;   
+    int16_t locoId;
+};
+#endif

version.h

@@ -3,7 +3,11 @@
 
 #include "StringFormatter.h"
 
-#define VERSION "5.5.17"
+#define VERSION "5.5.18"
+// 5.5.18 - New STASH internals 
+//        - EXRAIL IFSTASH/CLEAR_ANY_STASH
+//        - <JM CLEAR ANY id> to clear any stash with loco id
+//        - See Release_Notes/Stash.md  
 // 5.5.17 - Extensive new compile time checking in exrail scripts (duplicate sequences etc), no function change 
 // 5.5.16 - DOXYGEN comments in EXRAIL2MacroReset.h
 // 5.5.15 - Support for F429ZI/F329ZI