using_avrprog(3avr)

🦋✨ NAME ✨🦋

using_avrprog — using the avrdude program 👑

🌸 Note, bestie: this section was contributed by Brian Dean [ bsd@bsdhome.com ]. Also, the avrdude program was previously called avrprog. The name got changed so nobody would confuse it with the avrprog program that Atmel ships with AvrStudio. iykyk 🙈

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💜 what even is avrdude

So avrdude is a program you use to update or read the flash and EEPROM memories of Atmel AVR microcontrollers on FreeBSD Unix. No cap. It supports the Atmel serial programming protocol using the PC's parallel port, and it 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). Periodt.

🎀 installing it

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

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

🔥 programming, in action

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

And the vibe check after that looks like this:

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.

🧚 breaking down those flags

• 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. 💖

💅 interactive mode

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

avrdude>

(yes bestie, the page literally just trails off mid-sentence into the prompt like that — iconic behavior honestly 😭✨)

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🌈 and that's the whole page! this one's from the AVR-LibC gang, version 2.2.1, and it lives at using_avrprog(3avr) in section 3 of the manual. mwah, go program a chip, you absolute main character 💖👑🦋