# Data Structures

Here are the data structures with brief descriptions:

FacePrinter | A FacePrinter is capable of performing low-level printing operations to some assigned (physical or 'virtual') face
filedescriptor | A union presenting a platform-independent representation of a file descriptor (specifically one capable of performing serial I/O)
fioparms | An AVRDUDE struct describing the ways in which a file may be opened
GPIOInterruptHandlerInfo | Information about an external interrupt handler attached to a GPIO pin
GRL | A GRL is a "General Reflex Locator"
ihexrec | The description of a single line of an Intel "ihex" format "hex file"
PacketHeader | The information associated with a packet, when it is stored in memory only -- there is no preestablished packet header on the wire
PacketPrinterHeader | Stores the information needed to use a virtual face to print a packet into a user-supplied buffer
PinInfo_s | A description of a single SFB-programmer-visible hardware pin
Programmer | A structure holding state associated with a program we may burn or are in the process of burning
PWMInfo | The per-PWM-capable SFB pin information needed to configure PWM on that pin
serial_device | A collection of function pointers that present the platform-independent interface for serial I/O
SFB_CONFIG_MEM_T | The data stored in flash configuration memory by the SFB _secondary_ bootloader
SFBAlarm | Manage "alarm clock"-style settable timers
SFBBootBlock | The exactly-64-byte-long SFB 'boot block' contents
SFBBrainReflex | A 'convenience object' which provides a means of declaring reflexes that trigger at the "brain" -- i.e., after the individual faces and the Spine
SFBByteBuffer | Base class providing services common to SFBRxByteBuffer and SFBTxByteBuffer
SFBDispatchEntry | An SFBDispatchEntry describes an SFB reflex
SFBFrame | Handles packet framing and deframing
SFBGRLMasterTable | The description of all the known arrays-of-PacketHandler's 'reflex tables'
SFBHeap | A minimal heap memory allocator, based on the ancient K&R approach
SFBHWHostRegister | An incomplete cut at host-side simulation of the SFB hardware registers
SFBHWHostRegisterMap | An incomplete cut at host-side simulation of the SFB hardware registers
SFBHWSerial | The object supporting 'hardware level' serial operations on the SFB
SFBHWTimer | The representation of a hardware timer
SFBMemory | A class for temporarily storing packets, and then retriggering on them at a later time
SFBProvenance | An SFBProvenance provides information that describes a sketch as a physical artifact
SFBReactor | The SFBReactor manages the SFB reflex triggering system: It determines how an SFB will react to any given packet type
SFBRxByteBuffer | A specialized SFBByteBuffer that handles asynchronous data reception, i.e., data is added to the buffer at interrupt level (IL), and removed from the buffer in the background process (BG)
SFBSerial | A serial communications "endpoint", implementing the SFB packet protocol, including baud rate negotiation (BRN)
SFBSpineReflex | A 'convenience object' which provides a means of declaring reflexes that trigger at the "spine" -- i.e., after the individual faces, but before the Brain
SFBTxByteBuffer | A specialized SFBByteBuffer that handles asynchronous data transmission, i.e., data is added to the buffer in the background process (BG), and removed from the buffer at interrupt level (IL)
UartDescriptor | UART (hardware serial port) configuration information