Initialize BootLoader

• Reset ( further Infos here: en/SerialProtocol )

   SendOutData('R', 0, NULL, 0);   

  Enter Bootloader

   SEND_CHAR(27);      // ESC
   Delay(20);          
   SEND_CHAR(0xAA);
   Delay(80);           

  Bootloader will send "MKBL" on success Get AVR-Signature:

   SEND_CHAR('t');   // get signature
   Answer:
   RxBuffer[0] = 0x74 ; RxBuffer[1] = 0x00 = MEGA644
   RxBuffer[0] = 0x76 ; RxBuffer[1] = 0x00 = MEGA8
   RxBuffer[0] = 0x78 ; RxBuffer[1] = 0x00 = MEGA168
   RxBuffer[0] = 0x7A ; RxBuffer[1] = 0x00 = MEGA1284
   RxBuffer[0] = 0xE0 ; RxBuffer[1] = 0x00 = STR91x 

  set Device:

   SEND_CHAR('T'); 
   END_CHAR(devicetyp);   // set devicetyp = 0x74 or 0x76 or 0x78 or 0xE0
  
   Answer:  RxBuffer[0] = 0x0D      // OKAY 

  Get Version (BootBlock)

   SEND_CHAR('V');
  
   Answer:
   RxBuffer[0] = Major;
   RxBuffer[1] = Minor; 

  Get Buffer Size:

   SEND_CHAR('b'); 
  
   Answer:
   RxBuffer[0] = 'Y'
   (unsigned int) SendBufferSize = RxBuffer[1]* 0x100 + RxBuffer[2];    

Flash Firmware

• Set size of Flash to clear ( only navi ):

   cmd[0] = 'X';
   cmd[1] = (Size >> 16) & 0xFF;
   cmd[2] = (Size >> 8) & 0xFF;
   cmd[3] = Size & 0xFF;
   SEND_BYTES(cmd, 4);
   
  
   Answer:
   RxBuffer[0] = 0x0D      // OKAY 

  clear Flash:

   SEND_CHAR('e');
  
   Answer:
   RxBuffer[0] = 0x0D      // OKAY 

  Set Adress:

   cmd[0] = 'A';
   cmd[1] = 0x00;
   cmd[2] = 0x00;
   SEND_BYTES(cmd, 3);
  
   Answer
   RxBuffer[0] = 0x0D      // OKAY  

  write Block:

  get data from Hex according http://www.schulz-koengen.de/biblio/intelhex.htm

   cmd[0] = 'B';
   cmd[1] = (SendBufferSize >> 8) & 0xFF;
   cmd[2] = SendBufferSize & 0xFF;
   cmd[3] = 'F';
   SEND_BYTES(cmd, 4);
   SEND_BYTES(data, SendBufferSize);
  
   Antwort:
   RxBuffer[0] = 0x0D      // OKAY 

  set buffersize correctly at last block when flashing the Navi-Ctrl you have to add CRC16 to every block - don't increase cmd[1]/cmd[2] with the 2 bytes of the crc

  
  Optional: Read Block to verify written Data (FC only): - set Addr to 0x00 ( see above )

   cmd[0] = 'g';
   cmd[1] = (SendBufferSize >> 8) & 0xFF;
   cmd[2] = SendBufferSize & 0xFF;
   cmd[3] = 'F';
   SEND_BYTES(cmd, 4);
          
    Answer:
    1 Block data - sizze according cmd[1] and cmd[2] 

Reset Settings

• only for FC

   cmd[0] = 'B';
   cmd[1] = 0;
   cmd[2] = 4;
   cmd[3] = 'E';
   SEND_BYTES(cmd, 4);
  
   cmd[0] = 0xFF;
   cmd[1] = 0xFF;
   cmd[2] = 0xFF;
   cmd[3] = 0xFF';
   SEND_BYTES(cmd, 4); 

Exit Bootloader

•  SEND_CHAR('E'); 

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CategoryCoding