Command Distributor

Improve and split multi-language responses. Remove dependency on RingStream.

CommandDistributor.cpp

@@ -30,16 +30,29 @@
 #include "DCC.h"
 #include "TrackManager.h"
 
-#if defined(BIG_MEMORY) | defined(WIFI_ON) | defined(ETHERNET_ON)
-// This section of CommandDistributor is simply not relevant on a uno or similar
-const byte NO_CLIENT=255;
 
+#ifdef BIG_RAM 
+  // use a buffer to allow broadcast
+  #define BUFFER broadcastBufferWriter
+  #define FLUSH broadcastBufferWriter->flush();
+  #define SHOVE(type) broadcastToClients(type);
+  StringBuffer * CommandDistributor::broadcastBufferWriter=new StringBuffer();
+#else
+  // on a UNO/NANO write direct to Serial and ignore flush/shove 
+  #define BUFFER &Serial
+  #define FLUSH 
+  #define SHOVE(type) 
+#endif 
+
+#ifdef CD_HANDLE_RING
+  // wifi or ethernet ring streams with multiple client types
   RingStream *  CommandDistributor::ring=0;
   byte CommandDistributor::ringClient=NO_CLIENT;
   CommandDistributor::clientType  CommandDistributor::clients[8]={
     NONE_TYPE,NONE_TYPE,NONE_TYPE,NONE_TYPE,NONE_TYPE,NONE_TYPE,NONE_TYPE,NONE_TYPE};
-RingStream * CommandDistributor::broadcastBufferWriter=new RingStream(100);
 
+// Parse is called by Withrottle or Ethernet interface to determine which
+// protocol the client is using and call the appropriate part of dcc++Ex
 void  CommandDistributor::parse(byte clientId,byte * buffer, RingStream * stream) {
   ring=stream;
   ringClient=stream->peekTargetMark();
@@ -56,15 +69,15 @@ void  CommandDistributor::parse(byte clientId,byte * buffer, RingStream * stream
 void CommandDistributor::forget(byte clientId) {
   clients[clientId]=NONE_TYPE;
 }
+#endif 
 
-
-void CommandDistributor::broadcast(bool includeWithrottleClients) {
-  broadcastBufferWriter->write((byte)'\0');
+// This will not be called on a uno 
+void CommandDistributor::broadcastToClients(clientType type) {
 
   /* Boadcast to Serials */
-  SerialManager::broadcast(broadcastBufferWriter);
+  if (type==COMMAND_TYPE) SerialManager::broadcast(broadcastBufferWriter->getString());
 
-#if defined(WIFI_ON) | defined(ETHERNET_ON)
+#ifdef CD_HANDLE_RING
   // If we are broadcasting from a wifi/eth process we need to complete its output
   // before merging broadcasts in the ring, then reinstate it in case
   // the process continues to output to its client.
@@ -72,49 +85,46 @@ void CommandDistributor::broadcast(bool includeWithrottleClients) {
 
   /* loop through ring clients */
   for (byte clientId=0; clientId<sizeof(clients); clientId++) {
-    if (clients[clientId]==NONE_TYPE) continue;
-    if ( clients[clientId]==WITHROTTLE_TYPE && !includeWithrottleClients) continue;
+    if (clients[clientId]==type)  {
       ring->mark(clientId);
-    broadcastBufferWriter->printBuffer(ring);
+      ring->print(broadcastBufferWriter->getString());
       ring->commit();
     }
+  }
   if (ringClient!=NO_CLIENT) ring->mark(ringClient);
 
 #endif
- broadcastBufferWriter->flush();
 }
-#else
-// For a UNO/NANO we can broadcast direct to just one Serial instead of the ring
-// Redirect ring output ditrect to Serial
-#define broadcastBufferWriter &Serial
-// and ignore the internal broadcast call.
-void CommandDistributor::broadcast(bool includeWithrottleClients) {
-  (void)includeWithrottleClients;
-}
-#endif
 
+// Public broadcast functions below 
 void  CommandDistributor::broadcastSensor(int16_t id, bool on ) {
-  StringFormatter::send(broadcastBufferWriter,F("<%c %d>\n"), on?'Q':'q', id);
-  broadcast(false);
+  FLUSH
+  StringFormatter::send(BUFFER,F("<%c %d>\n"), on?'Q':'q', id);
+  SHOVE(COMMAND_TYPE)
 }
 
 void  CommandDistributor::broadcastTurnout(int16_t id, bool isClosed ) {
   // For DCC++ classic compatibility, state reported to JMRI is 1 for thrown and 0 for closed;
   // The string below contains serial and Withrottle protocols which should
   // be safe for both types.
-  StringFormatter::send(broadcastBufferWriter,F("<H %d %d>\n"),id, !isClosed);
-#if defined(WIFI_ON) | defined(ETHERNET_ON)
-  StringFormatter::send(broadcastBufferWriter,F("PTA%c%d\n"), isClosed?'2':'4', id);
+  FLUSH
+  StringFormatter::send(BUFFER,F("<H %d %d>\n"),id, !isClosed);
+  SHOVE(COMMAND_TYPE)
+
+#ifdef CD_HANDLE_RING 
+  FLUSH
+  StringFormatter::send(BUFFER,F("PTA%c%d\n"), isClosed?'2':'4', id);
+  SHOVE(WITHROTTLE_TYPE)
 #endif
-  broadcast(true);
 }
 
 void  CommandDistributor::broadcastLoco(byte slot) {
   DCC::LOCO * sp=&DCC::speedTable[slot];
-  StringFormatter::send(broadcastBufferWriter,F("<l %d %d %d %l>\n"),
+  FLUSH
+  StringFormatter::send(BUFFER,F("<l %d %d %d %l>\n"),
 			sp->loco,slot,sp->speedCode,sp->functions);
-  broadcast(false);
-#if defined(WIFI_ON) | defined(ETHERNET_ON)
+  SHOVE(COMMAND_TYPE)
+#ifdef CD_HANDLE_RING
   WiThrottle::markForBroadcast(sp->loco);
 #endif
 }
@@ -130,14 +140,24 @@ void  CommandDistributor::broadcastPower() {
   else if (main) reason=F(" MAIN");
   else if (prog) reason=F(" PROG");
   else state='0';
-
-  StringFormatter::send(broadcastBufferWriter,
-                        F("<p%c%S>\nPPA%c\n"),state,reason, main?'1':'0');
+  FLUSH
+  StringFormatter::send(BUFFER,F("<p %c%S>\n"),state,reason);
+  SHOVE(COMMAND_TYPE)
+#ifdef CD_HANDLE_RING
+  FLUSH
+  StringFormatter::send(BUFFER,F("PPA%c\n"), main?'1':'0');
+  SHOVE(WITHROTTLE_TYPE)
+#endif
   LCD(2,F("Power %S%S"),state=='1'?F("On"):F("Off"),reason);  
-  broadcast(true);
 }
 
 void CommandDistributor::broadcastText(const FSH * msg) {
-  StringFormatter::send(broadcastBufferWriter,F("%S"),msg);
-  broadcast(false); 
+  FLUSH
+  StringFormatter::send(BUFFER,F("%S"),msg);
+  SHOVE(COMMAND_TYPE) 
+#ifdef CD_HANDLE_RING
+  FLUSH
+  StringFormatter::send(BUFFER,F("Hm%S\n"), msg);
+  SHOVE(WITHROTTLE_TYPE)
+#endif
 }

CommandDistributor.h

@@ -23,6 +23,13 @@
 #define CommandDistributor_h
 #include "DCCEXParser.h"
 #include "RingStream.h"
+#include "StringBuffer.h"
+#include "defines.h"
+
+#if WIFI_ON | ETHERNET_ON 
+  // Command Distributor must handle a RingStream of clients
+  #define CD_HANDLE_RING
+#endif 
 
 class CommandDistributor {
 
@@ -35,14 +42,15 @@ public :
   static void broadcastText(const FSH * msg);
   static void forget(byte clientId);
 private:
-  static void broadcast(bool includeWithrottleClients);
-  static RingStream * ring;
-  static RingStream * broadcastBufferWriter;
-  static byte ringClient;
-
-   // each bit in broadcastlist = 1<<clientid
   enum clientType: byte {NONE_TYPE,COMMAND_TYPE,WITHROTTLE_TYPE};
+  static void broadcastToClients(clientType type);
+  static StringBuffer * broadcastBufferWriter;
+  #ifdef CD_HANDLE_RING
+    static RingStream * ring;
+    static const byte NO_CLIENT=255;
+    static byte ringClient;
     static clientType clients[8];
+  #endif
 };
 
 #endif

SerialManager.cpp

@@ -21,6 +21,7 @@
 
 #include "SerialManager.h"
 #include "DCCEXParser.h"
+
 SerialManager * SerialManager::first=NULL;
 
 SerialManager::SerialManager(Stream * myserial) {
@@ -49,11 +50,11 @@ void SerialManager::init() {
 #endif
 }
 
-void SerialManager::broadcast(RingStream * ring) {
-    for (SerialManager * s=first;s;s=s->next) s->broadcast2(ring);
+void SerialManager::broadcast(char * stringBuffer) {
+    for (SerialManager * s=first;s;s=s->next) s->broadcast2(stringBuffer);
 }
-void SerialManager::broadcast2(RingStream * ring) {
-    ring->printBuffer(serial);
+void SerialManager::broadcast2(char * stringBuffer) {
+    serial->print(stringBuffer);
 }
 
 void SerialManager::loop() {

SerialManager.h

@@ -23,7 +23,7 @@
 
 #include "Arduino.h"
 #include "defines.h"
-#include "RingStream.h"
+
 
 #ifndef COMMAND_BUFFER_SIZE
  #define COMMAND_BUFFER_SIZE 100
@@ -33,13 +33,13 @@ class SerialManager {
 public:
   static void init();
   static void loop();
-  static void broadcast(RingStream * ring);
+  static void broadcast(char * stringBuffer);
   
 private:  
   static SerialManager * first;
   SerialManager(Stream * myserial);
   void loop2();
-  void broadcast2(RingStream * ring);
+  void broadcast2(char * stringBuffer);
   Stream * serial;
   SerialManager * next;
   byte bufferLength;

StringBuffer.cpp

@@ -0,0 +1,45 @@
+/*
+ *  © 2022 Chris Harlow
+ *  All rights reserved.
+ *  
+ *  This file is part of DCC-EX CommandStation-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 "StringBuffer.h"
+#include "DIAG.h"
+
+StringBuffer::StringBuffer() {
+    flush();
+};
+
+char * StringBuffer::getString() { 
+   return _buffer;
+}
+
+void StringBuffer::flush() {
+    _pos_write=0;
+    _buffer[0]='\0';
+}
+
+size_t StringBuffer::write(uint8_t b) {
+  if (_pos_write>=buffer_max) return 0;
+  _buffer[_pos_write] = b;
+  ++_pos_write;
+  _buffer[_pos_write]='\0';
+  return 1;
+}
+
+

StringBuffer.h

@@ -0,0 +1,38 @@
+ /*
+ *  © 2022 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 StringBuffer_h
+#define StringBuffer_h
+#include <Arduino.h>
+
+class StringBuffer : public Print {
+  public:
+    StringBuffer(); 
+    // Override Print default
+    virtual size_t write(uint8_t b);
+    void flush();
+    char * getString();
+  private:
+    static const int  buffer_max=64; // enough for long text msgs to throttles  
+    int16_t _pos_write;
+    char _buffer[buffer_max+1];
+};
+
+#endif

version.h

@@ -6,6 +6,7 @@
 
 #define VERSION "4.0.3"
 // 4.0.3 Track Manager additions:
+//       Broadcast improvements to separate <> and Withrottle responses
 //       Float eliminated saving >1.5kb PROGMEM and speed. 
 //       SET_TRACK(track,mode) Functions (A-H, MAIN|PROG|DC|DCX|OFF)
 //       New DC track function and DCX reverse polarity function