HID Usage Tables Document 1.1 - C. Scott Ananian

Universal Serial Bus HID Usage Tables 83Usage ID Usage Name Usage Type Section3F Character Spacing Horizontal SV 17.840 Character Spacing Vertical SV 17.841 Unicode Character Set SF 17.242-FFFF Reserved17.1 Alphanumeric DisplayAlphaNumericDisplay17.2 FlagsCA – A collection of alphanumeric-related display usages.If a flag is defined as a single-bit constant Input item, it is simply a read-only bit for the host. If a flag isdefined as an Output item, it can be used to enable or disable the flag’s feature.The Display ASCII Character Set defines a minimum character set that will be supported by a display. Theblank character locations in the table may be optionally defined by a vendor. All characters will be passed tothe display, so to take advantage of the other characters the controlling application must know vendorspecificinformation. The total number of character codes supported is vendor-specific.Display AttributesReportASCII Character SetCL –Identifies the report associated with features of the display device.SF – Finding this usage in a display application descriptor indicates that thedevice supports an 8-bit ASCII-compatible character set as shown in Table19. In the table, the high nibble of the character code is labeled across the topand the low nibble is labeled down the left side. NoOp means that nooperation is performed if this character is received. Space clears the characterposition.Table 19: ASCII Display Character SetLow High NibbleNibble 0 1 2 3 4 5 6 70 NoOp Space 0 @ P ` p1 ! 1 A Q a q2 “ 2 B R b r3 # 3 C S c s4 $ 4 D T d t5 % 5 E U e u6 & 6 F V f v7 ‘ 7 G W g w8 ( 8 H X h x9 ) 9 I Y i yA * : J Z j zB + ; K [ k {Version 1.1 April 8, 1999