• Read Attiny44 micro controller datasheet
• Install Arduino IDE
• Make arduino as ISP
• Download Arduino Board libraries for ATtiny boards
• Connect FTDI to Arduino
• Burn bootloder in Hello ftdi board
• Compile C program
• Transfer C program to your FTDI board

Before starting of programming I have decided to go through Attiny44 datasheet
Here is a link for Attiny44 Datasheet Attiny24/44/84 datasheet
My friend Chaitali had explained us how to read datasheet and introduced us some of the important concepts

Following are some of the takeouts after reading Datasheet

• Attiny44 has 4K memory whereas Attiny24 has 2K memory and Attiny84 has 8K memory everything else remains the same
• Pinout diagram is useful and need to take it handy while designing circuit. It shows that it has total 14 pins

• PA stands for port A and PB stands for Port B
• PB0 and PB1 are the pins where external crystal can be connected
• There are MISO, MOSI, SCK (SCL), RESET, VCC and GND labels respecctively at pins PA5, PA6, PA4, PB3, VCC and GND
• PA4 and PA6 has SCL and SDA hence this controller can be used for I2C communication


• Block diagram can be seen on Page no 4 which indicates it has
  • DDRA : Data direction register for port A
  • DDRB : Data direction register for port B
  • PORTA : Register to activate pins of a port A
  • PORTB : Register to activate pins of a port B

• Download arduino IDE from Arduino IDE Download
• For linux 64 bit it will download file naming "arduino-1.8.1-linux64.tar.xz"
  wget https://downloads.arduino.cc/arduino-1.8.1-linux64.tar.xz
  Even though you can copy and paste this command in terminal and execute. Its better to manually download the latest version of arduino IDE
• Extract "arduino-1.8.1-linux64.tar.xz" at suitable location. Preferable extract it in your home folder
  mv arduino-1.8.1-linux64.tar.xz /home/-Your Username Here-/
  Will move compressed file to your home folder
  cd ~
  Change your directory to home directory
  tar -xJf ./arduino-1.8.1-linux64.tar.xz
  Extract compressed file which will create a folder naming "arduino-1.8.1" which is your installation folder of Arduino IDE
  cd arduino-1.8.1/
  ./install.sh
  Open arduino-1.8.1 folder and run install.sh script
  This will install shortcut of Arduino IDE. Thats it. Arduino IDE is installed

Without which ATtiny boards will not be visible under Tools -> Board

• Write your own c programs. Download sample program from here
  • Programs
• Write make file based on what processor you are using
  • I have changed following lines in the original make file
    PROJECT=hello.ftdi.44.echo
    PROJECT=t44.blink.syk
    avrdude -p t44 -P usb -c usbtiny -U flash:w:$(PROJECT).c.hex
    avrdude -p t44 -P /dev/ttyACM0 -c stk500v1 -b19200 -U flash:w:$(PROJECT).c.hex
    avrdude -p t44 -P usb -c usbtiny -U lfuse:w:0x5E:m
    avrdude -p t44 -P /dev/ttyACM0 -c stk500v1 -b19200 -U lfuse:w:0x5E:m
    -P /dev/ttyACM0 is a port on which board is connected. You can find it in Arduino IDE tools menu
    -c stk500v1 is a programmer type. Since we are using arduino as a programmer
    For more info on avrdude command line arguments you can refer http://www.ladyada.net/learn/avr/avrdude.html
    
    
• Install avr-gcc package if not installed on your computer. Its GCC compiler for c programs
  sudo apt install gcc-avr
  Without installing gcc-avr you will encounter error "make: avr-gcc: Command not found"
• Install avr-libc package if not installed on your computer. These are header files available in software repository of Ubuntu Mate
  sudo apt install avr-libc
  Without this package you will encounter following error
  avr/io.h: No such file or directory #include <avr/io.h> ^ compilation terminated
• Install avrdude package if not installed on your computer
  sudo apt install avrdude
  Without this package you will encounter following error
  make: avrdude: Command not found
• transfer.sh is a bash script combining all following make commands. Run following commands in terminal to compile and transfer c program to your board
  Make sure your board is connected through arduino and Capacitor is still connected
  • make -f t44.blink.syk.c.make
  • make -f t44.blink.syk.c.make program-usbtiny-fuses
  • make -f t44.blink.syk.c.make program-usbtiny

  OR

  • ./transfer.sh