Using the avrdude program


This section was contributed by Brian Dean [ ].

The avrdude program was previously called avrprog. The name was changed to avoid confusion with the avrprog program that Atmel ships with AvrStudio.

avrdude is a program that is used to update or read the flash and EEPROM memories of Atmel AVR microcontrollers on FreeBSD Unix. It supports the Atmel serial programming protocol using the PC's parallel port and can upload either a raw binary file or an Intel Hex format file. It can also be used in an interactive mode to individually update EEPROM cells, fuse bits, and/or lock bits (if their access is supported by the Atmel serial programming protocol.) The main flash instruction memory of the AVR can also be programmed in interactive mode, however this is not very useful because one can only turn bits off. The only way to turn flash bits on is to erase the entire memory (using avrdude's -e option).

avrdude is part of the FreeBSD ports system. To install it, simply do the following:

 # cd /usr/ports/devel/avrdude # make install 

Once installed, avrdude can program processors using the contents of the .hex file specified on the command line. In this example, the file main.hex is burned into the flash memory:

 # avrdude -p 2313 -e -m flash -i main.hex avrdude: AVR device initialized and
          ready to accept instructions avrdude: Device signature = 0x1e9101 avrdude: erasing chip
          avrdude: done. avrdude: reading input file "main.hex" avrdude: input file main.hex auto
          detected as Intel Hex avrdude: writing flash: 1749 0x00 avrdude: 1750 bytes of flash
          written avrdude: verifying flash memory against main.hex: avrdude: reading on-chip flash
          data: 1749 0x00 avrdude: verifying ... avrdude: 1750 bytes of flash verified avrdude done.
          Thank you. 

The -p 2313 option lets avrdude know that we are operating on an AT90S2313 chip. This option specifies the device id and is matched up with the device of the same id in avrdude's configuration file ( /usr/local/etc/avrdude.conf ). To list valid parts, specify the -v option. The -e option instructs avrdude to perform a chip-erase before programming; this is almost always necessary before programming the flash. The -m flash option indicates that we want to upload data into the flash memory, while -i main.hex specifies the name of the input file.

The EEPROM is uploaded in the same way, the only difference is that you would use -m eeprom instead of -m flash.

To use interactive mode, use the -t option:

 # avrdude -p 2313 -t avrdude: AVR device initialized and ready to accept
          instructions avrdude: Device signature = 0x1e9101 avrdude> The '?' command displays a
          list of valid commands: avrdude> ? >>> ? Valid commands: dump : dump memory :
          dump <memtype> <addr> <N-Bytes> read : alias for dump write : write
          memory : write <memtype> <addr> <b1> <b2> ... <bN> erase :
          perform a chip erase sig : display device signature bytes part : display the current part
          information send : send a raw command : send <b1> <b2> <b3> <b4>
          help : help ? : help quit : quit Use the 'part' command to display valid memory types for
          use with the 'dump' and 'write' commands. avrdude>