Passing additional configuration to arduino-cli compile

[panigrah]

Arduino-ide allows setting up of additional build parameters specific to each board. e.g. when building for an esp32 board i can set configuration parameters such as partition in the arduino IDE.

How do I configure a partition when using arduino-cli? It always picks the default.

[per1234]

You do this by specifying the board configuration options in the arduino-cli command's --fqbn option.

For example, if you wanted to compile with the equivalent of having the Tools > Partition Scheme > Minimal (1.3MB APP/700KB SPIFFS) setting selected in the Arduino IDE, you would use this command:

arduino-cli compile --fqbn esp32:esp32:esp32:PartitionScheme=minimal

As you discovered, when you don't specify a configuration option value in the FQBN (e.g., esp32:esp32:esp32), the default option is used.

I have provided more information on how custom boards options work with FQBNs and how to determine the correct FQBN in these earlier issues:

• Ability to specify SoftDevice #591 (comment)
• Need assistance tracking down FQBNs for boards #138 (comment)

We probably do need to further improve the documentation to make this easier for the Arduino CLI users, but we have an existing issue about that (#355), so I'll go ahead and close this one.