From d196068a8ca3d47ec9f92525644b12fb70aeb29b Mon Sep 17 00:00:00 2001
From: Philip Kin <philip@thekinfamily.com>
Date: Wed, 16 Nov 2011 09:16:14 -0600
Subject: M30/M31 fast sd block transfer

---
 Sprinter/Configuration.h |   6 ++-
 Sprinter/Sprinter.pde    | 106 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 111 insertions(+), 1 deletion(-)

(limited to 'Sprinter')

diff --git a/Sprinter/Configuration.h b/Sprinter/Configuration.h
index 950387a..be42e0b 100644
--- a/Sprinter/Configuration.h
+++ b/Sprinter/Configuration.h
@@ -50,9 +50,13 @@ const bool Z_ENDSTOP_INVERT = false;
 // Comment out (using // at the start of the line) to disable SD support:
 #define SDSUPPORT
 
-
 //// ADVANCED SETTINGS - to tweak parameters
 
+#ifdef SDSUPPORT
+	//Fast transfer chunk size (> 1024 is unstable, change at your own risk).
+	#define SD_FAST_XFER_CHUNK_SIZE 1024
+#endif
+
 #include "thermistortables.h"
 
 // For Inverting Stepper Enable Pins (Active Low) use 0, Non Inverting (Active High) use 1
diff --git a/Sprinter/Sprinter.pde b/Sprinter/Sprinter.pde
index bc8a2ac..b189744 100644
--- a/Sprinter/Sprinter.pde
+++ b/Sprinter/Sprinter.pde
@@ -167,6 +167,9 @@ unsigned long stepper_inactive_time = 0;
   bool sdactive = false;
   bool savetosd = false;
   int16_t n;
+  char fastxferbuffer[SD_FAST_XFER_CHUNK_SIZE + 1];
+  int lastxferchar;
+  long xferbytes;
   
   void initsd(){
   sdactive = false;
@@ -205,6 +208,102 @@ unsigned long stepper_inactive_time = 0;
           Serial.println("error writing to file");
       }
   }
+  
+  void fast_xfer()
+  {
+    char *pstr;
+    boolean done = false;
+    
+    //force heater pins low
+    if(HEATER_0_PIN > -1) WRITE(HEATER_0_PIN,LOW);
+    if(HEATER_1_PIN > -1) WRITE(HEATER_1_PIN,LOW);
+    
+    lastxferchar = 1;
+    xferbytes = 0;
+    
+    pstr = strstr(strchr_pointer+4, " ");
+    
+    if(pstr == NULL)
+    {
+      SerialMgr.cur()->println("invalid command");
+      return;
+    }
+    
+    *pstr = '\0';
+    
+    //check mode (currently only RAW is supported
+    if(strcmp(strchr_pointer+4, "RAW") != 0)
+    {
+      SerialMgr.cur()->println("Invalid transfer codec");
+      return;
+    }else{
+      SerialMgr.cur()->print("Selected codec: ");
+      SerialMgr.cur()->println(strchr_pointer+4);
+    }
+    
+    if (!file.open(&root, pstr+1, O_CREAT | O_APPEND | O_WRITE | O_TRUNC))
+    {
+      SerialMgr.cur()->print("open failed, File: ");
+      SerialMgr.cur()->print(pstr+1);
+      SerialMgr.cur()->print(".");
+    }else{
+      SerialMgr.cur()->print("Writing to file: ");
+      SerialMgr.cur()->println(pstr+1);
+    }
+        
+    SerialMgr.cur()->println("ok");
+    
+    //RAW transfer codec
+    //Host sends \0 then up to SD_FAST_XFER_CHUNK_SIZE then \0
+    //when host is done, it sends \0\0.
+    //if a non \0 character is recieved at the beginning, host has failed somehow, kill the transfer.
+    
+    //read SD_FAST_XFER_CHUNK_SIZE bytes (or until \0 is recieved)
+    while(!done)
+    {
+      while(!SerialMgr.cur()->available())
+      {
+      }
+      if(SerialMgr.cur()->peek() != 0)
+      {
+        //host has failed, this isn't a RAW chunk, it's an actual command
+        file.sync();
+        file.close();
+        return;
+      }
+      //clear the initial 0
+      SerialMgr.cur()->read();
+      for(int i=0;i<SD_FAST_XFER_CHUNK_SIZE+1;i++)
+      {
+        while(!SerialMgr.cur()->available())
+        {
+        }
+        lastxferchar = SerialMgr.cur()->read();
+        //buffer the data...
+        fastxferbuffer[i] = lastxferchar;
+        
+        xferbytes++;
+        
+        if(lastxferchar == 0)
+          break;
+      }
+      
+      if(fastxferbuffer[0] != 0)
+      {
+        fastxferbuffer[SD_FAST_XFER_CHUNK_SIZE] = 0;
+        file.write(fastxferbuffer);
+        SerialMgr.cur()->println("ok");
+      }else{
+        SerialMgr.cur()->print("Wrote ");
+        SerialMgr.cur()->print(xferbytes);
+        SerialMgr.cur()->println(" bytes.");
+        done = true;
+      }
+    }
+
+    file.sync();
+    file.close();
+  }
 #endif
 
 
@@ -750,6 +849,13 @@ inline void process_commands()
         //processed in write to file routine above
         //savetosd = false;
         break;
+	  case 30: //M30 - fast SD transfer
+        fast_xfer();
+        break;
+      case 31: //M31 - high speed xfer capabilities
+        SerialMgr.cur()->print("RAW:");
+        SerialMgr.cur()->println(SD_FAST_XFER_CHUNK_SIZE);
+        break;
 #endif
       case 42: //M42 -Change pin status via gcode
         if (code_seen('S'))
-- 
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