Diff: SDCread.h

Revision:

1:a0055b3280c8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SDCread.h	Mon Dec 14 12:04:01 2015 +0000
@@ -0,0 +1,190 @@
+// It takes 276us to read from sd card and write in 112 buffer
+ 
+//~ #include"SDcard.h"
+#define T_frames 30
+unsigned char buffer_112_counter,sent_tm = 0;
+int disk_read(uint8_t *, uint64_t),j;
+bool new_session = true;
+bool last_buffer = false;
+bool first_block = true;
+bool last_block =false;
+bool repeat_T_frame = false;
+unsigned int counter_in_block=0,diff_prev=0;
+unsigned char  EOS_counter = 0;
+unsigned char enable_T_frame = false;
+uint64_t  start_block_num ;           // Read from TC
+uint64_t  end_block_num ;            // Read from TC
+uint64_t  Number_of_blocks_to_read ;
+uint64_t  block_counter = 0;
+unsigned char buffer_512[512], buffer_112[112],counter_in_S_frame=0,counter_in_SCH=0;
+unsigned char make_EOS_flag = true;
+bool reset = false;
+ 
+void differential_encode(unsigned char* ptr, int length){
+    
+        for(int i=0; i<length;i++){
+        
+            unsigned char s = ptr[i] , t;
+            t = s ^ (s >> 1);
+            (diff_prev == 0) ? t=t^0x00 : t=t^0x80 ;
+            diff_prev = int(s & 0x01);
+            ptr[i] = t;
+        }
+        
+    } 
+ 
+void send_tm_from_SD_card(){
+    
+    if(make_EOS_flag == true){
+        make_EOS_flag = false;
+        Number_of_blocks_to_read = end_block_num - start_block_num +1;
+    }
+    
+    
+    for(buffer_112_counter=0;buffer_112_counter<112;buffer_112_counter++){
+      
+ 
+        if(new_session == true){          //check if it is beginnig of session  
+ 
+            buffer_112[buffer_112_counter]=S_frame[counter_in_S_frame++];  // sending S frame 
+            
+            if(counter_in_S_frame==48){
+//                cout<<"new_session_over\n";
+                counter_in_S_frame=0;
+                new_session = false;
+                enable_T_frame = true;
+//              enable_SCH = true;
+            }
+        }
+        else if(enable_T_frame == true){             // To send t frames
+ 
+            if(block_counter != Number_of_blocks_to_read){                  
+                
+                if(first_block){                            // Read first block
+//                    cout<<"brooooooo"<<start_block_num<<"yo"<<endl;   
+                    SPI_mutex.lock();     
+                    disk_read(buffer_512,start_block_num );
+                    SPI_mutex.unlock();
+                    counter_in_block = 0;
+                    block_counter++;
+                    
+                    first_block = false;
+//                    cout<<"first block exit\n";
+//                   cout<<Number_of_blocks_to_read;
+                   
+                   //printf("\n");
+//                    for(int j=0;j<512;j++){
+//                    printf("%02X ",buffer_512[j]);
+//                    }
+//                    printf("\n");
+//                    if(block_counter == Number_of_blocks_to_read){
+//                        last_block = true;
+//                    }
+                    
+                    
+                }
+                if((counter_in_block == 318 )&&(sent_tm<38)){                 // Read next block
+ 
+//                    cout<<"next block exit\n";
+                    SPI_mutex.lock();
+                    disk_read(buffer_512,start_block_num + block_counter );
+                    SPI_mutex.unlock();
+                    counter_in_block = 0;
+                    block_counter++;
+                    if(block_counter == Number_of_blocks_to_read){
+                        last_block = true;
+                    }
+                }
+            }
+                        
+            if(!last_block){  
+              
+ //                 cout<<int(sent_tm)<<" ";
+                if(sent_tm<38){
+                    buffer_112[buffer_112_counter] = buffer_512[counter_in_block++];    // sending T frames
+//                  cout<<int (counter_in_block)<<" ";
+                    if(counter_in_block == 318){
+                       
+                        sent_tm = sent_tm + 2;
+                    }   
+                }
+                else if(sent_tm == (T_frames-1)){
+                    buffer_112[buffer_112_counter] = buffer_512[(counter_in_block++ )-159];
+                    if(counter_in_block == 318){
+//                        cout<<"last block exit\n";
+                        sent_tm = T_frames;
+                    }
+                }
+                else if(sent_tm == T_frames){       // Give eos and start new session         
+                    buffer_112[buffer_112_counter]=EoS[EOS_counter++];
+                        if(EOS_counter == 120){
+                            enable_T_frame = false;
+                            new_session = true;
+                            EOS_counter =0;
+                            sent_tm=0;
+                            repeat_T_frame = false;
+//                          cout<<"eos exit\n";
+                        }
+                }
+            }
+            if(last_block){
+//                cout<<"lb";
+                if(sent_tm == (T_frames-1) && (repeat_T_frame == false)){
+                    buffer_112[buffer_112_counter] = buffer_512[(counter_in_block++ )-159];
+                    if(counter_in_block == 318){
+//                      cout<<"repeat block exit\n";
+                        sent_tm = T_frames;
+                    }
+                }
+                 if((sent_tm == T_frames) && (repeat_T_frame == false)){       // Give eos and start new session         
+                    buffer_112[buffer_112_counter]=EoS[EOS_counter++];
+                       if(EOS_counter == 120){
+//                        cout<<"eos exit";
+                        enable_T_frame = false;
+                        new_session = true;
+                        EOS_counter =0;
+                        sent_tm=0;
+                    }
+                }
+                else if((sent_tm < (T_frames-1)) && (repeat_T_frame == false)){
+                    buffer_112[buffer_112_counter] = buffer_512[counter_in_block++];    // sending last two T frames    
+                    if(counter_in_block == 318){
+                        sent_tm = sent_tm + 2;
+                        repeat_T_frame= true;
+                    }
+                }
+                else if((sent_tm< T_frames) && (repeat_T_frame == true)){
+                    buffer_112[buffer_112_counter] = buffer_512[(counter_in_block++ )-159];
+                    if(counter_in_block == 477){
+                        sent_tm = sent_tm +1;
+                        counter_in_block = counter_in_block-159;
+                    }
+                }
+                else if((sent_tm == T_frames ) && (repeat_T_frame == true)){       // Give eos and start new session         
+                   
+                    buffer_112[buffer_112_counter]=EoS[EOS_counter++];
+                        if(EOS_counter == 120){
+                        enable_T_frame = false;
+                        new_session = true;
+                        EOS_counter =0;
+//                    printf("yoooo %d",int(sent_tm));    
+                        sent_tm=0;
+                    
+                        last_block = false;
+                        last_buffer = true;
+                        printf("?\r\n");
+                        break;
+                    }
+                }
+                
+            }   
+        
+        }
+                    
+    }
+    differential_encode(buffer_112, 112);
+    if(last_buffer ==true){
+    diff_prev=0;
+    }
+    
+}
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