AVR development in Linux

* Install necessary packages

$ sudo apt-get install gcc-avr
$ sudo apt-get install avrdude
$ sudo apt-get install avr-libc

* Compiling code

Steps(2) -> .c => .elf => .hex

$ avr-gcc -Os -mmcu=$2 file_name.c -o file_name.elf
 $ avr-objcopy -j .text -O ihex file_name.elf file_name.hex

* Uploading code

$ sudo avrdude -p part_name -c programmer_id \
     -U flash:w:file_name.hex

•  part_name => m16, m8
•  prog_id => usbasp
•  "flash" => programs flash
•  "w" => write mode
•  shld be run as super user => "sudo"

* Compiler optimization

• specify an option -Ox while compiling (avr-gcc -Ox ... )
• x => optimization levels
• "-Os" => "s"=> small - for smaller code

Made a video of LED blinking @ 900ms

* FUSE BITS:

 # read
$ avrdude -p m16 -c usbasp -U fuse_name:r:file_name.txt:h

•  fuse_name => lfuse,hfuse,lock
•  "r" => read
•  fuse value "h" in hex format
• stored in file_name.txt file

# write
$ avrdude -p m16 -c usbasp -U fuse_name:w:0x82:m

•  "0x82" => sample fuse value
•  "m" => immediate ( use value in cmd directly )
•  "w" => write

* Note: make use of AVR fuse CALC available online

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