Here are the data structures with brief descriptions:

CADC_meas	Container for ADC measurement results
Ccan_device	Represents a CAN device, storing the SPI slave controlling the MCP2515
CCAN_frame	Represents a full CAN frame for sending/receiving
Ccan_msg	Represents a simple CAN message with an address, data count, and a single byte of data
Ccontrol_state	Stores current control state
Cio_avr_device	Represents an SPI-connected AVR-I/O board
Cio_joystick_device	Represents a joystick input device
Cio_joystick_position	Represents the position of a joystick relative to center
Cio_oled_device	Represents an OLED display device controlled via SPI
Cmenu_cfg	Menu configuration and state
Cmenu_item	Menu item struct
Coled_font	Represents a font for OLED displays
CUSART_config	USART configuration structure