# Secure Bootloader Sample Reference Typedef Documentation

## BL_FCS_t

typedef uint16_t BL_FCS_t

Location: bl_fcs.h:86

Define a FCS type.

## BL_FSFileId_t

typedef uint16_t BL_FSFileId_t

Location: bl_simple_filer.h:132

Define a file identifier as a sixteen bit word.

## BL_BootAppId_t

typedef char BL_BootAppId_t

Location: bl_versions.h:109

Define the application ID as a six character string.