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  1. Friedrich-Alexander-Universität
  2. Technische Fakultät
  3. Department Informatik
Friedrich-Alexander-Universität Lehrstuhl für Informatik 4 (Systemsoftware)
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                              Aufgabe 2: Unterbrechungen

                              Enumerations | Functions
                              PS2Controller Namespace Reference
                              I/O subsystem

                              PS/2 Controller. More...

                              Enumerations

                              enum  Status {
                                HAS_OUTPUT = 1 << 0 ,
                                INPUT_PENDING = 1 << 1 ,
                                SYSTEM_FLAG = 1 << 2 ,
                                IS_COMMAND = 1 << 3 ,
                                IS_MOUSE = 1 << 5 ,
                                TIMEOUT_ERROR = 1 << 6 ,
                                PARITY_ERROR = 1 << 7
                              }
                               Flags in the PS/2 controller status register. More...
                               
                              enum  KeyboardCommand : uint8_t {
                                KEYBOARD_SET_LED = 0xed ,
                                KEYBOARD_SEND_ECHO = 0xee ,
                                KEYBOARD_SET_SPEED = 0xf3 ,
                                KEYBOARD_ENABLE = 0xf4 ,
                                KEYBOARD_DISABLE = 0xf5 ,
                                KEYBOARD_SET_DEFAULT = 0xf6
                              }
                               Commands to be send to the Keyboard. More...
                               
                              enum  Reply {
                                ACK = 0xfa ,
                                RESEND = 0xfe ,
                                ECHO = 0xee
                              }
                               Replies. More...
                               
                              enum  ControllerCommand {
                                CONTROLLER_GET_COMMAND_BYTE = 0x20 ,
                                CONTROLLER_SET_COMMAND_BYTE = 0x60 ,
                                CONTROLLER_MOUSE_DISABLE = 0xa7 ,
                                CONTROLLER_MOUSE_ENABLE = 0xa8 ,
                                CONTROLLER_KEYBOARD_DISABLE = 0xad ,
                                CONTROLLER_KEYBOARD_ENABLE = 0xae ,
                                CONTROLLER_SEND_TO_MOUSE = 0xd4
                              }
                               Commands for the PS/2 Controller. More...
                               
                              enum  MouseCommand {
                                MOUSE_RESET = 0xff ,
                                MOUSE_DEFAULTS = 0xf6 ,
                                MOUSE_STREAMING_DISABLE = 0xf5 ,
                                MOUSE_STREAMING_ENABLE = 0xf4 ,
                                MOUSE_SAMPLE_RATE = 0xf3 ,
                                MOUSE_ID = 0xf2 ,
                                MOUSE_REQUEST_PACKET = 0xeb ,
                                MOUSE_REQUEST_STATUS = 0xe9 ,
                                MOUSE_RESOLUTION = 0xe8 ,
                                MOUSE_SCALING_2_1 = 0xe7 ,
                                MOUSE_SCALING_1_1 = 0xe6
                              }
                               Commands to be send to the mouse. More...
                               
                              enum  Delay {
                                DELAY_250MS = 0 ,
                                DELAY_500MS = 1 ,
                                DELAY_750MS = 2 ,
                                DELAY_1000MS = 3
                              }
                               Delay before the keyboard starts repeating sending a pressed key. More...
                               
                              enum  Speed {
                                SPEED_30_0CPS = 0x00 ,
                                SPEED_26_7CPS = 0x01 ,
                                SPEED_24_0CPS = 0x02 ,
                                SPEED_21_8CPS = 0x03 ,
                                SPEED_20_7CPS = 0x04 ,
                                SPEED_18_5CPS = 0x05 ,
                                SPEED_17_1CPS = 0x06 ,
                                SPEED_16_0CPS = 0x07 ,
                                SPEED_15_0CPS = 0x08 ,
                                SPEED_13_3CPS = 0x09 ,
                                SPEED_12_0CPS = 0x0a ,
                                SPEED_10_9CPS = 0x0b ,
                                SPEED_10_0CPS = 0x0c ,
                                SPEED_09_2CPS = 0x0d ,
                                SPEED_08_6CPS = 0x0e ,
                                SPEED_08_0CPS = 0x0f ,
                                SPEED_07_5CPS = 0x10 ,
                                SPEED_06_7CPS = 0x11 ,
                                SPEED_06_0CPS = 0x12 ,
                                SPEED_05_5CPS = 0x13 ,
                                SPEED_05_0CPS = 0x14 ,
                                SPEED_04_6CPS = 0x15 ,
                                SPEED_04_3CPS = 0x16 ,
                                SPEED_04_0CPS = 0x17 ,
                                SPEED_03_7CPS = 0x18 ,
                                SPEED_03_3CPS = 0x19 ,
                                SPEED_03_0CPS = 0x1a ,
                                SPEED_02_7CPS = 0x1b ,
                                SPEED_02_5CPS = 0x1c ,
                                SPEED_02_3CPS = 0x1d ,
                                SPEED_02_1CPS = 0x1e ,
                                SPEED_02_0CPS = 0x1f
                              }
                               Repeat Rate of Characters. More...
                               
                              enum  LED {
                                LED_SCROLL_LOCK = 1 << 0 ,
                                LED_NUM_LOCK = 1 << 1 ,
                                LED_CAPS_LOCK = 1 << 2
                              }
                               Keyboard LEDs. More...
                               

                              Functions

                              void init ()
                               Initialization of connected devices. More...
                               
                              bool fetch (Key &pressed)
                               Retrieve the keyboard event. More...
                               
                              bool fetch (Pointer &state)
                               Retrieve the mouse event. More...
                               
                              void setRepeatRate (Speed speed, Delay delay)
                               Configure the repeat rate of the keyboard. More...
                               
                              void setLed (enum LED led, bool on)
                               Enable or disable a keyboard LED. More...
                               
                              void drainBuffer ()
                               Empties the keyboard buffer. More...
                               

                              Detailed Description

                              PS/2 Controller.

                              Initializes the PS/2 devices (Keyboard and optional Mouse), and determines both the scan code and ASCII character of a pressed key from the transmitted make and break codes using the KeyDecoder.

                              Note
                              This controller is also known as Intel 8042 (nowadays integrated in the mainboard) or Keyboard Controller. But to avoid confusion with the actual Keyboard and since we use the PS/2-compatible mode to support the Mouse as well, the name PS/2 Controller was chosen for the sake of simplicity.
                              Since modern PCs sometimes don't have an PS/2 connector, USB keyboards and mice are emulated as PS/2 device with USB Legacy Support.

                              Enumeration Type Documentation

                              enum PS2Controller::Status

                              Flags in the PS/2 controller status register.

                              Enumerator
                              HAS_OUTPUT 

                              Output buffer non-empty?

                              INPUT_PENDING 

                              Is input buffer full?

                              SYSTEM_FLAG 

                              set on soft reset, cleared on power up

                              IS_COMMAND 

                              Is command Byte? (otherwise data)

                              IS_MOUSE 

                              Mouse output has data.

                              TIMEOUT_ERROR 

                              Timeout error.

                              PARITY_ERROR 

                              Parity error.

                              enum PS2Controller::KeyboardCommand : uint8_t

                              Commands to be send to the Keyboard.

                              Enumerator
                              KEYBOARD_SET_LED 

                              Set the LED (according to the following parameter byte)

                              KEYBOARD_SEND_ECHO 

                              Send an echo packet.

                              KEYBOARD_SET_SPEED 

                              Set the repeat rate (according to the following parameter byte)

                              KEYBOARD_ENABLE 

                              Enable Keyboard.

                              KEYBOARD_DISABLE 

                              Disable Keyboard.

                              KEYBOARD_SET_DEFAULT 

                              Load defaults.

                              enum PS2Controller::Reply

                              Replies.

                              Enumerator
                              ACK 

                              Acknowledgement.

                              RESEND 

                              Request to resend (not required to implement)

                              ECHO 

                              Echo answer.

                              enum PS2Controller::ControllerCommand

                              Commands for the PS/2 Controller.

                              These commands are processed by the controller and not send to keyboard/mouse. They have to be written into the command register.

                              Enumerator
                              CONTROLLER_GET_COMMAND_BYTE 

                              Read Command Byte of PS/2 Controller.

                              CONTROLLER_SET_COMMAND_BYTE 

                              Write Command Byte of PS/2 Controller.

                              CONTROLLER_MOUSE_DISABLE 

                              Disable mouse interface.

                              CONTROLLER_MOUSE_ENABLE 

                              Enable mouse interface.

                              CONTROLLER_KEYBOARD_DISABLE 

                              Disable keyboard interface.

                              CONTROLLER_KEYBOARD_ENABLE 

                              Enable keyboard interface.

                              CONTROLLER_SEND_TO_MOUSE 

                              Send parameter to mouse device.

                              enum PS2Controller::MouseCommand

                              Commands to be send to the mouse.

                              See also
                              ps2mouse
                              Enumerator
                              MOUSE_RESET 

                              Reset and perform self-test.

                              MOUSE_DEFAULTS 

                              Reset settings to default.

                              MOUSE_STREAMING_DISABLE 

                              Don't report mouse movements.

                              MOUSE_STREAMING_ENABLE 

                              Send data on mouse movement/button events.

                              MOUSE_SAMPLE_RATE 

                              Set sample rate.

                              MOUSE_ID 

                              Get device ID.

                              MOUSE_REQUEST_PACKET 

                              Get movement data.

                              MOUSE_REQUEST_STATUS 

                              Get status packet (responses with 3 bytes)

                              MOUSE_RESOLUTION 

                              Set resolution (requires parameter)

                              MOUSE_SCALING_2_1 

                              Set scaling 2:1.

                              MOUSE_SCALING_1_1 

                              Set scaling 1:1.

                              enum PS2Controller::Delay

                              Delay before the keyboard starts repeating sending a pressed key.

                              Enumerator
                              DELAY_250MS 

                              Delay of 0.25s.

                              DELAY_500MS 

                              Delay of 0.5s.

                              DELAY_750MS 

                              Delay of 0.75s.

                              DELAY_1000MS 

                              Delay of 1s.

                              enum PS2Controller::Speed

                              Repeat Rate of Characters.

                              See also
                              The PS/2 Keyboard Interface
                              Enumerator
                              SPEED_30_0CPS 

                              30 characters per second

                              SPEED_26_7CPS 

                              26.7 characters per second

                              SPEED_24_0CPS 

                              24 characters per second

                              SPEED_21_8CPS 

                              12.8 characters per second

                              SPEED_20_7CPS 

                              20.7 characters per second

                              SPEED_18_5CPS 

                              18.5 characters per second

                              SPEED_17_1CPS 

                              17.1 characters per second

                              SPEED_16_0CPS 

                              16 characters per second

                              SPEED_15_0CPS 

                              15 characters per second

                              SPEED_13_3CPS 

                              13.3 characters per second

                              SPEED_12_0CPS 

                              12 characters per second

                              SPEED_10_9CPS 

                              10.9 characters per second

                              SPEED_10_0CPS 

                              10 characters per second

                              SPEED_09_2CPS 

                              9.2 characters per second

                              SPEED_08_6CPS 

                              8.6 characters per second

                              SPEED_08_0CPS 

                              8 characters per second

                              SPEED_07_5CPS 

                              7.5 characters per second

                              SPEED_06_7CPS 

                              6.7 characters per second

                              SPEED_06_0CPS 

                              6 characters per second

                              SPEED_05_5CPS 

                              5.5 characters per second

                              SPEED_05_0CPS 

                              5 characters per second

                              SPEED_04_6CPS 

                              4.6 characters per second

                              SPEED_04_3CPS 

                              4.3 characters per second

                              SPEED_04_0CPS 

                              4 characters per second

                              SPEED_03_7CPS 

                              3.7 characters per second

                              SPEED_03_3CPS 

                              3.3 characters per second

                              SPEED_03_0CPS 

                              3 characters per second

                              SPEED_02_7CPS 

                              2.7 characters per second

                              SPEED_02_5CPS 

                              2.5 characters per second

                              SPEED_02_3CPS 

                              2.3 characters per second

                              SPEED_02_1CPS 

                              2.1 characters per second

                              SPEED_02_0CPS 

                              2 characters per second

                              enum PS2Controller::LED

                              Keyboard LEDs.

                              Enumerator
                              LED_SCROLL_LOCK 

                              Scroll Lock.

                              LED_NUM_LOCK 

                              Num Lock.

                              LED_CAPS_LOCK 

                              Caps Lock.

                              Function Documentation

                              void PS2Controller::init ( )

                              Initialization of connected devices.

                              All status LEDs of the keyboard are switched off and the repetition rate is set to maximum speed.

                              bool PS2Controller::fetch ( Key &  pressed)

                              Retrieve the keyboard event.

                              Retrieves make and brake events from the keyboard. If a valid (non special) key was pressed, the scan code is determined using KeyDecoder::decode into a Key object. Events on special keys like Shift, Alt, CapsLock etc. are stored (in KeyDecoder) and applied on subsequent keystrokes, while no valid key is retrieved.

                              Mouse events are ignored.

                              Todo:
                              Adjust method (unless it is already non-blocking)
                              Parameters
                              pressedReference to an object which will contain the pressed Key on success
                              Returns
                              true if a valid key was decoded
                              bool PS2Controller::fetch ( Pointer &  state)

                              Retrieve the mouse event.

                              If a full mouse state was retrieved (all 3 packets have been successfully processed by the MouseDecoder) the new state is retrieved. Keyboard events are not processed.

                              Note
                              fetch(Key&) has to be adjusted to not process (instead of ignore) mouse packets, or events might be lost.
                              Optional:
                              Adjust method
                              Parameters
                              stateReference to an object which will contain the Mouse Pointer state on success
                              Returns
                              true if a valid mouse pointer state was decoded
                              void PS2Controller::setRepeatRate ( Speed  speed,
                              Delay  delay 
                              )

                              Configure the repeat rate of the keyboard.

                              Parameters
                              delayconfigures how long a key must be pressed before the repetition begins.
                              speeddetermines how fast the key codes should follow each other. Valid values are between 0 (30 characters per second) and 31 (2 characters per second).
                              void PS2Controller::setLed ( enum LED  led,
                              bool  on 
                              )

                              Enable or disable a keyboard LED.

                              Parameters
                              ledLED to enable or disable
                              ontrue will enable the specified LED, false disable
                              void PS2Controller::drainBuffer ( )

                              Empties the keyboard buffer.

                              The keyboard may not send any interrupts if the buffer is not empty. To prevent unhandled keystrokes (for example during boot) the buffer should be emptied once right before allowing keyboard interrupts (even if keystrokes might be lost).

                              Todo:
                              Implement method
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