ps/2 keyboard prototype

kvmd/kvmd.yaml

@@ -8,7 +8,7 @@ kvmd:
         pinout:
             clock: 17
             data: 4
-        delay: 0.0002
+        pulse: 0.0002
 
     atx:
         leds:

kvmd/kvmd/__init__.py

@@ -5,6 +5,7 @@ from .application import init
 
 from .atx import Atx
 from .streamer import Streamer
+from .ps2 import Ps2Keyboard
 from .server import Server
 
 from . import gpio
@@ -33,9 +34,16 @@ def main() -> None:
             loop=loop,
         )
 
+        keyboard = Ps2Keyboard(
+            clock=config["keyboard"]["pinout"]["clock"],
+            data=config["keyboard"]["pinout"]["data"],
+            pulse=config["keyboard"]["pulse"],
+        )
+
         Server(
             atx=atx,
             streamer=streamer,
+            keyboard=keyboard,
             heartbeat=config["server"]["heartbeat"],
             atx_leds_poll=config["atx"]["leds"]["poll"],
             video_shutdown_delay=config["video"]["shutdown_delay"],

kvmd/kvmd/atx.py

@@ -24,8 +24,8 @@ class Atx:
         self.__power_led = gpio.set_input(power_led)
         self.__hdd_led = gpio.set_input(hdd_led)
 
-        self.__power_switch = gpio.set_output_zeroed(power_switch)
+        self.__power_switch = gpio.set_output(power_switch)
-        self.__reset_switch = gpio.set_output_zeroed(reset_switch)
+        self.__reset_switch = gpio.set_output(reset_switch)
         self.__click_delay = click_delay
         self.__long_click_delay = long_click_delay
 

kvmd/kvmd/gpio.py

@@ -21,8 +21,8 @@ def bcm() -> Generator[None, None, None]:
         _logger.info("GPIO cleaned")
 
 
-def set_output_zeroed(pin: int) -> int:
+def set_output(pin: int, initial: bool=False) -> int:
-    GPIO.setup(pin, GPIO.OUT)
+    GPIO.setup(pin, GPIO.OUT, initial=initial)
     GPIO.output(pin, False)
     return pin
 

kvmd/kvmd/ps2.py

@@ -0,0 +1,63 @@
+import multiprocessing
+import multiprocessing.queues
+import queue
+import logging
+import time
+
+from . import gpio
+
+
+# =====
+_logger = logging.getLogger(__name__)
+
+
+class Ps2Keyboard(multiprocessing.Process):
+    def __init__(self, clock: int, data: int, pulse: float) -> None:
+        super().__init__(daemon=True)
+
+        self.__clock = gpio.set_output(clock, initial=True)
+        self.__data = gpio.set_output(data, initial=True)
+        self.__pulse = pulse
+
+        self.__queue: multiprocessing.queues.Queue = multiprocessing.Queue()
+        self.__event = multiprocessing.Event()
+
+    def start(self) -> None:
+        _logger.info("Starting keyboard daemon ...")
+        super().start()
+
+    def stop(self) -> None:
+        _logger.info("Stopping keyboard daemon ...")
+        self.__event.set()
+        self.join()
+
+    def send_byte(self, code: int) -> None:
+        self.__queue.put(code)
+
+    def run(self) -> None:
+        try:
+            while not self.__event.is_set():
+                try:
+                    code = self.__queue.get(timeout=0.1)
+                except queue.Empty:
+                    pass
+                else:
+                    self.__send_byte(code)
+        except Exception:
+            _logger.exception("Unhandled exception")
+            raise
+
+    def __send_byte(self, code: int) -> None:
+        code_bits = list(map(bool, bin(code)[2:].zfill(8)))
+        code_bits.reverse()
+        message = [False] + code_bits + [(not sum(code_bits) % 2), True]
+        for bit in message:
+            self.__send_bit(bit)
+
+    def __send_bit(self, bit: bool) -> None:
+        gpio.write(self.__clock, True)
+        gpio.write(self.__data, bool(bit))
+        time.sleep(self.__pulse)
+        gpio.write(self.__clock, False)
+        time.sleep(self.__pulse)
+        gpio.write(self.__clock, True)

kvmd/kvmd/server.py

@@ -13,6 +13,7 @@ import aiohttp
 
 from .atx import Atx
 from .streamer import Streamer
+from .ps2 import Ps2Keyboard
 
 
 # =====
@@ -36,6 +37,7 @@ class Server:  # pylint: disable=too-many-instance-attributes
         self,
         atx: Atx,
         streamer: Streamer,
+        keyboard: Ps2Keyboard,
         heartbeat: float,
         atx_leds_poll: float,
         video_shutdown_delay: float,
@@ -45,6 +47,7 @@ class Server:  # pylint: disable=too-many-instance-attributes
         self.__atx = atx
         self.__streamer = streamer
         self.__heartbeat = heartbeat
+        self.__keyboard = keyboard
         self.__video_shutdown_delay = video_shutdown_delay
         self.__atx_leds_poll = atx_leds_poll
         self.__loop = loop
@@ -55,6 +58,8 @@ class Server:  # pylint: disable=too-many-instance-attributes
         self.__system_tasks: List[asyncio.Task] = []
 
     def run(self, host: str, port: int) -> None:
+        self.__keyboard.start()
+
         app = aiohttp.web.Application(loop=self.__loop)
         app.router.add_get("/", self.__root_handler)
         app.router.add_get("/ws", self.__ws_handler)
@@ -62,6 +67,7 @@ class Server:  # pylint: disable=too-many-instance-attributes
         app.on_cleanup.append(self.__on_cleanup)
 
         self.__system_tasks.extend([
+            self.__loop.create_task(self.__monitor_keyboard()),
             self.__loop.create_task(self.__stream_controller()),
             self.__loop.create_task(self.__poll_dead_sockets()),
             self.__loop.create_task(self.__poll_atx_leds()),
@@ -101,9 +107,17 @@ class Server:  # pylint: disable=too-many-instance-attributes
             await self.__remove_socket(ws)
 
     async def __on_cleanup(self, _: aiohttp.web.Application) -> None:
+        if self.__keyboard.is_alive():
+            self.__keyboard.stop()
         if self.__streamer.is_running():
             await self.__streamer.stop()
 
+    @_system_task
+    async def __monitor_keyboard(self) -> None:
+        while self.__keyboard.is_alive():
+            await asyncio.sleep(0.1)
+        raise RuntimeError("Keyboard dead")
+
     @_system_task
     async def __stream_controller(self) -> None:
         prev = 0

kvmd/kvmd/streamer.py

@@ -22,8 +22,8 @@ class Streamer:  # pylint: disable=too-many-instance-attributes
         loop: asyncio.AbstractEventLoop,
     ) -> None:
 
-        self.__cap_power = gpio.set_output_zeroed(cap_power)
+        self.__cap_power = gpio.set_output(cap_power)
-        self.__vga_power = gpio.set_output_zeroed(vga_power)
+        self.__vga_power = gpio.set_output(vga_power)
         self.__sync_delay = sync_delay
 
         self.__cmd = (