Atmega_Hex_Uploader_Fixed_Filename: How to change the fuse setting? about arduino_sketches HOT 8 OPEN

void writeFuse (const byte newValue, const byte instruction)

// which program instruction writes which fuse
const byte fuseCommands [4] = { writeLowFuseByte, writeHighFuseByte, writeExtendedFuseByte, writeLockByte };

writeFuse (0xD9, writeHighFuseByte);
writeFuse (0xEF, writeLowFuseByte);

  // now fix up fuses so we can boot    
  if (errors == 0)
    updateFuses (true);

  // now fix up fuses so we can boot    
  if (errors == 0)
    {
    // updateFuses (true);  // OMITTED BECAUSE OF TWO LINES BELOW
    writeFuse (0xD9, writeHighFuseByte);
    writeFuse (0xEF, writeLowFuseByte);
    }

 // Function for string (from the text file placed inside SD card) to hex
byte StrToHex(char str[])
{
  return (byte) (str <= '9') ? str - '0' : str - '7';
}

// Function to check if file exist
boolean fileExists(const char* name) {
  return sd.exists(name);
}


// within void setup ()  after line number 1370 of the original code
 if (errors == 0)
    {
      if(fileExists(fileName_fuse)){

        // Modified for kapil
        // fileName_fuse is a file named "fuse.txt"
        // contain single line "DEFF0500"
        // HFuseLFuseEFuesLock
       
        File NewFile;
        String read_line;
        char hexValue[10];
        byte Fuse_Byte_file[4];
        int pp=0;
   
        NewFile = sd.open(fileName_fuse);
        if (NewFile){
          while(NewFile.available()){
          read_line = NewFile.readStringUntil('\n');
          break;
          }
        }
        NewFile.close();      
        read_line.toCharArray(hexValue,10);
       
        for(int f_line=0; f_line<4; f_line++){
          Fuse_Byte_file[f_line] = (16 * StrToHex(hexValue[pp])) + StrToHex(hexValue[pp+1]);
          //Serial.println(Fuse_Byte_file[f_line], HEX);
          //Serial.println("\n"); // it displays perfectly
          pp=pp+2;
        }      
        // For USBASP following fusebit are used for atmega8    HFUSE=0xc9  LFUSE=0xef
        //ATmega8 HFUSE=0xD9  LFUSE=0xE1  Factory Default Settings for ATmega8.
        //H fuse: Reset Disabled  : Unprogrammed (Reset pin is enabled)
        //Watchdog        : Off
        //SPI Programming : Enabled
        //CKOPT           : Unprogrammed
        //EEPROM Preserve : Unprogrammed (EEPROM not preserved)
        //BOOT size       : 1024 words
        //Reset Vector    : User flash code
        //L fuse: Brown-out level : 2.7V
        //Brown-out detect: Disabled
        //Startup timing  : Default
        //Clock Source    : Internal, 1MHz
        //ATmega8 HFUSE=0xD9  LFUSE=0xEF ; External Crystal upto 16MHz. Rest of the options : Default.
        writeFuse (Fuse_Byte_file[0], writeHighFuseByte); // For arduino Uno HFUSE: 0XDE
        writeFuse (Fuse_Byte_file[1], writeLowFuseByte); // For arduino Uno LFUSE: 0xFF
        writeFuse (Fuse_Byte_file[2], writeExtendedFuseByte); // For arduino Uno EFUSE: 0x05
        //writeFuse (Fuse_Byte_file[3], writeLockByte); //Caution!! use carefully
      }
      else
        updateFuses (true);
    }