+====================================
Intelligent Keyboard (ikbd) Protocol
+====================================
-1. Introduction
+Introduction
+============
The Atari Corp. Intelligent Keyboard (ikbd) is a general purpose keyboard
controller that is flexible enough that it can be used in a variety of
the controller is possible in applications in which only a unidirectional
communications medium is available by carefully designing the default modes.
-3. Keyboard
+Keyboard
+========
The keyboard always returns key make/break scan codes. The ikbd generates
keyboard scan codes for each key press and release. The key scan make (key
is obtained by ORing 0x80 with the make code.
The special codes 0xF6 through 0xFF are reserved for use as follows:
+
+=================== ====================================================
+ Code Command
+=================== ====================================================
0xF6 status report
0xF7 absolute mouse position record
0xF8-0xFB relative mouse position records (lsbs determined by
- mouse button states)
+ mouse button states)
0xFC time-of-day
0xFD joystick report (both sticks)
0xFE joystick 0 event
0xFF joystick 1 event
+=================== ====================================================
The two shift keys return different scan codes in this mode. The ENTER key
and the RETurn key are also distinct.
-4. Mouse
+Mouse
+=====
The mouse port should be capable of supporting a mouse with resolution of
approximately 200 counts (phase changes or 'clicks') per inch of travel. The
The mouse buttons can be treated as part of the mouse or as additional
keyboard keys.
-4.1 Relative Position Reporting
+Relative Position Reporting
+---------------------------
In relative position mode, the ikbd will return relative mouse position
records whenever a mouse event occurs. A mouse event consists of a mouse
resumed) (b) while any event is being transmitted.
The relative mouse position record is a three byte record of the form
-(regardless of keyboard mode):
+(regardless of keyboard mode)::
+
%111110xy ; mouse position record flag
; where y is the right button state
; and x is the left button state
Note that the sign of the delta y reported is a function of the Y origin
selected.
-4.2 Absolute Position reporting
+Absolute Position reporting
+---------------------------
The ikbd can also maintain absolute mouse position. Commands exist for
resetting the mouse position, setting X/Y scaling, and interrogating the
current mouse position.
-4.3 Mouse Cursor Key Mode
+Mouse Cursor Key Mode
+---------------------
The ikbd can translate mouse motion into the equivalent cursor keystrokes.
The number of mouse clicks per keystroke is independently programmable in
codes above those normally assigned for the largest envisioned keyboard (i.e.
LEFT=0x74 & RIGHT=0x75).
-5. Joystick
+Joystick
+========
-5.1 Joystick Event Reporting
+Joystick Event Reporting
+------------------------
In this mode, the ikbd generates a record whenever the joystick position is
changed (i.e. for each opening or closing of a joystick switch or trigger).
-The joystick event record is two bytes of the form:
+The joystick event record is two bytes of the form::
+
%1111111x ; Joystick event marker
; where x is Joystick 0 or 1
%x000yyyy ; where yyyy is the stick position
; and x is the trigger
-5.2 Joystick Interrogation
+Joystick Interrogation
+----------------------
The current state of the joystick ports may be interrogated at any time in
this mode by sending an 'Interrogate Joystick' command to the ikbd.
-The ikbd response to joystick interrogation is a three byte report of the form
+The ikbd response to joystick interrogation is a three byte report of the form::
+
0xFD ; joystick report header
%x000yyyy ; Joystick 0
%x000yyyy ; Joystick 1
; where x is the trigger
; and yyy is the stick position
-5.3 Joystick Monitoring
+Joystick Monitoring
+-------------------
A mode is available that devotes nearly all of the keyboard communications
time to reporting the state of the joystick ports at a user specifiable rate.
command in this mode not only stop the output but also temporarily stops
scanning the joysticks (samples are not queued).
-5.4 Fire Button Monitoring
+Fire Button Monitoring
+----------------------
A mode is provided to permit monitoring a single input bit at a high rate. In
this mode the ikbd monitors the state of the Joystick 1 fire button at the
only stops the output but also temporarily stops scanning the button (samples
are not queued).
-5.5 Joystick Key Code Mode
+Joystick Key Code Mode
+----------------------
The ikbd may be commanded to translate the use of either joystick into the
equivalent cursor control keystroke(s). The ikbd provides a single breakpoint
joysticks produce pseudo key scan codes above those used by the largest key
matrix envisioned (i.e. JOYSTICK0=0x74, JOYSTICK1=0x75).
-6. Time-of-Day Clock
+Time-of-Day Clock
+=================
The ikbd also maintains a time-of-day clock for the system. Commands are
available to set and interrogate the timer-of-day clock. Time-keeping is
maintained down to a resolution of one second.
-7. Status Inquiries
+Status Inquiries
+================
The current state of ikbd modes and parameters may be found by sending status
inquiry commands that correspond to the ikbd set commands.
-8. Power-Up Mode
+Power-Up Mode
+=============
The keyboard controller will perform a simple self-test on power-up to detect
major controller faults (ROM checksum and RAM test) and such things as stuck
received while port 0 is presumed to be a mouse, the button is logically
assigned to Joystick1 (until the mouse is reenabled by another mouse command).
-9. ikbd Command Set
+ikbd Command Set
+================
This section contains a list of commands that can be sent to the ikbd. Command
codes (such as 0x00) which are not specified should perform no operation
(NOPs).
-9.1 RESET
+RESET
+-----
+
+::
0x80
0x01
closed will cause the break scan code to be generated (the break code arriving
without being preceded by the make code is a flag for a key matrix error).
-9.2. SET MOUSE BUTTON ACTION
+SET MOUSE BUTTON ACTION
+-----------------------
+
+::
0x07
%00000mss ; mouse button action
; position report
; where y=1, mouse key press causes absolute report
; and x=1, mouse key release causes absolute report
- ; mss=100, mouse buttons act like keys
+ ; mss=100, mouse buttons act like keys
This command sets how the ikbd should treat the buttons on the mouse. The
default mouse button action mode is %00000000, the buttons are treated as part
of the mouse logically.
When buttons act like keys, LEFT=0x74 & RIGHT=0x75.
-9.3 SET RELATIVE MOUSE POSITION REPORTING
+SET RELATIVE MOUSE POSITION REPORTING
+-------------------------------------
+
+::
0x08
button is pressed or released. Otherwise the mouse buttons behave as if they
were keyboard keys.
-9.4 SET ABSOLUTE MOUSE POSITIONING
+SET ABSOLUTE MOUSE POSITIONING
+------------------------------
+
+::
0x09
XMSB ; X maximum (in scaled mouse clicks)
XLSB
YMSB ; Y maximum (in scaled mouse clicks)
YLSB
-
+
Set absolute mouse position maintenance. Resets the ikbd maintained X and Y
coordinates.
In this mode, the value of the internally maintained coordinates does NOT wrap
command sets the maximum positive value that can be attained in the scaled
coordinate system. Motion beyond that value is also ignored.
-9.5 SET MOUSE KEYCODE MOSE
+SET MOUSE KEYCODE MOSE
+----------------------
+
+::
0x0A
deltax ; distance in X clicks to return (LEFT) or (RIGHT)
cause the make code immediately followed by the break code. Note that this
command is not affected by the mouse motion origin.
-9..6 SET MOUSE THRESHOLD
+SET MOUSE THRESHOLD
+-------------------
+
+::
0x0B
X ; x threshold in mouse ticks (positive integers)
command is valid only in RELATIVE MOUSE POSITIONING mode. The thresholds
default to 1 at RESET (or power-up).
-9.7 SET MOUSE SCALE
+SET MOUSE SCALE
+---------------
+
+::
0x0C
X ; horizontal mouse ticks per internal X
POSITIONING mode unless the ikbd has been commanded to report on button press
or release (see SET MOSE BUTTON ACTION).
-9.8 INTERROGATE MOUSE POSITION
+INTERROGATE MOUSE POSITION
+--------------------------
+
+::
0x0D
Returns:
The INTERROGATE MOUSE POSITION command is valid when in the ABSOLUTE MOUSE
POSITIONING mode, regardless of the setting of the MOUSE BUTTON ACTION.
-9.9 LOAD MOUSE POSITION
+LOAD MOUSE POSITION
+-------------------
+
+::
0x0E
0x00 ; filler
This command allows the user to preset the internally maintained absolute
mouse position.
-9.10 SET Y=0 AT BOTTOM
+SET Y=0 AT BOTTOM
+-----------------
+
+::
0x0F
mouse motion. This causes mouse motion toward the user to be negative in sign
and away from the user to be positive.
-9.11 SET Y=0 AT TOP
+SET Y=0 AT TOP
+--------------
+
+::
0x10
This causes mouse motion toward the user to be positive in sign and away from
the user to be negative.
-9.12 RESUME
+RESUME
+------
+
+::
0x11
thought of as a NO OPERATION command. If this command is received by the ikbd
and it is not PAUSED, it is simply ignored.
-9.13 DISABLE MOUSE
+DISABLE MOUSE
+-------------
+
+::
0x12
N.B. If the mouse buttons have been commanded to act like keyboard keys, this
command DOES affect their actions.
-9.14 PAUSE OUTPUT
+PAUSE OUTPUT
+------------
+
+::
0x13
MONITORING mode, the PAUSE OUTPUT command also temporarily stops the
monitoring process (i.e. the samples are not enqueued for transmission).
-0.15 SET JOYSTICK EVENT REPORTING
+SET JOYSTICK EVENT REPORTING
+----------------------------
+
+::
0x14
Enter JOYSTICK EVENT REPORTING mode (DEFAULT). Each opening or closure of a
joystick switch or trigger causes a joystick event record to be generated.
-9.16 SET JOYSTICK INTERROGATION MODE
+SET JOYSTICK INTERROGATION MODE
+-------------------------------
+
+::
0x15
Disables JOYSTICK EVENT REPORTING. Host must send individual JOYSTICK
INTERROGATE commands to sense joystick state.
-9.17 JOYSTICK INTERROGATE
+JOYSTICK INTERROGATE
+--------------------
+
+::
0x16
is valid in either the JOYSTICK EVENT REPORTING mode or the JOYSTICK
INTERROGATION MODE.
-9.18 SET JOYSTICK MONITORING
+SET JOYSTICK MONITORING
+-----------------------
+
+::
0x17
rate ; time between samples in hundredths of a second
N.B. The user should not set the rate higher than the serial communications
channel will allow the 2 bytes packets to be transmitted.
-9.19 SET FIRE BUTTON MONITORING
+SET FIRE BUTTON MONITORING
+--------------------------
+
+::
0x18
Returns: (as long as in mode)
the previous byte to be sent to the host (i.e. scan rate = 8/10 * baud rate).
The sample interval should be as constant as possible.
-9.20 SET JOYSTICK KEYCODE MODE
+SET JOYSTICK KEYCODE MODE
+-------------------------
+
+::
0x19
RX ; length of time (in tenths of seconds) until
disabled. The values of TX and TY then become meaningless, and the generation
of cursor 'keystrokes' is set by VX and VY.
-9.21 DISABLE JOYSTICKS
+DISABLE JOYSTICKS
+-----------------
+
+::
0x1A
INTERROGATION MODE, SET JOYSTICK MONITORING, SET FIRE BUTTON MONITORING, and
SET JOYSTICK KEYCODE MODE.)
-9.22 TIME-OF-DAY CLOCK SET
+TIME-OF-DAY CLOCK SET
+---------------------
+
+::
0x1B
YY ; year (2 least significant digits)
and not alter that particular field of the date or time. This permits setting
only some subfields of the time-of-day clock.
-9.23 INTERROGATE TIME-OF-DAT CLOCK
+INTERROGATE TIME-OF-DAT CLOCK
+-----------------------------
+
+::
0x1C
Returns:
All time-of-day is sent in packed BCD format.
-9.24 MEMORY LOAD
+MEMORY LOAD
+-----------
+
+::
0x20
ADRMSB ; address in controller
This command permits the host to load arbitrary values into the ikbd
controller memory. The time between data bytes must be less than 20ms.
-9.25 MEMORY READ
+MEMORY READ
+-----------
+
+::
0x21
ADRMSB ; address in controller
This command permits the host to read from the ikbd controller memory.
-9.26 CONTROLLER EXECUTE
+CONTROLLER EXECUTE
+------------------
+
+::
0x22
ADRMSB ; address of subroutine in
This command allows the host to command the execution of a subroutine in the
ikbd controller memory.
-9.27 STATUS INQUIRIES
-
+STATUS INQUIRIES
+----------------
+
+::
+
Status commands are formed by inclusively ORing 0x80 with the
relevant SET command.
ikbd to restore its state. The 0 pad bytes will be treated as NOPs by the
ikbd.
- Valid STATUS INQUIRY commands are:
+ Valid STATUS INQUIRY commands are::
0x87 mouse button action
0x88 mouse mode
mode or FIRE BUTTON MONITORING mode.
-10. SCAN CODES
+SCAN CODES
+==========
The key scan codes returned by the ikbd are chosen to simplify the
implementation of GSX.
-GSX Standard Keyboard Mapping.
+GSX Standard Keyboard Mapping
+======= ============
Hex Keytop
+======= ============
01 Esc
02 1
03 2
09 8
0A 9
0B 0
-0C -
-0D ==
+0C \-
+0D \=
0E BS
0F TAB
10 Q
26 L
27 ;
28 '
-29 `
+29 \`
2A (LEFT) SHIFT
-2B \
+2B \\
2C Z
2D X
2E C
70 KEYPAD 0
71 KEYPAD .
72 KEYPAD ENTER
+======= ============
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff