.gitignore

@@ -1,2 +1,2 @@
 *.stamp
-local_secrets.py
+secrets.py

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "third_party/micropython"]
-	path = third_party/micropython
-	url = https://github.com/micropython/micropython.git

src/Makefile

@@ -11,25 +11,11 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-SRC = $(wildcard *.py) $(wildcard lib/*.py)
+SRC = $(wildcard *.py)
 
-MPY_CROSS = ../third_party/micropython/mpy-cross/build/mpy-cross
-
-put: $(SRC:%.py=build/put-%.stamp)
+put: $(SRC:%.py=put-%.stamp)
 	ampy -p /dev/ttyUSB? ls
 
-build/put-%.stamp: %.py
-	mkdir -p $(@D)
-	ampy -p /dev/ttyUSB? put $< $(<F)
-	touch -r $< $@
-
-build/%.mpy: %.py $(MPY_CROSS)
-	mkdir -p $(@D)
-	$(MPY_CROSS) -O1 -march=xtensa -o $@ $<
-
-$(MPY_CROSS):
-	$(MAKE) -C $(dir $(@D))
-
-clean:
-	rm -rf build
-
+put-%.stamp: %.py
+	ampy -p /dev/ttyUSB? put $*.py
+	cp -a $< $@

src/asynced.py

@@ -15,16 +15,14 @@ import time
 
 import compat
 
-from typing import Generator
 
-
-def delay(secs: float) -> Generator[None, None, None]:
+def delay(secs: float) -> generator:
     end = compat.monotonic() + secs
     while compat.monotonic() < end:
         yield None
 
 
-def fps(fps: float) -> Generator[None, None, None]:
+def fps(fps: float) -> generator:
     yield None
     dt = 1 / fps
     until = compat.monotonic() + dt
@@ -39,12 +37,16 @@ def fps(fps: float) -> Generator[None, None, None]:
         yield None
 
 
-def wait(stop_ms: int) -> Generator[int, None, None]:
-    """Waits for stop_ms to pass, yielding how many ms have passed so far."""
+def wait(stop: int) -> generator:
     start = compat.monotonic()
     while True:
         elapsed = int((compat.monotonic() - start) * 1000)
-        elapsed = min(stop_ms, elapsed)
+        elapsed = min(stop, elapsed)
         yield elapsed
-        if elapsed >= stop_ms:
+        if elapsed >= stop:
             break
+
+
+def test():
+    for f in delay(2.0):
+        print(utime.ticks_ms())

src/compat.py

@@ -14,16 +14,14 @@
 import random
 import time
 
-import utime
+
+def monotonic():
+    return time.ticks_ms() * 1e-3
 
 
-def monotonic() -> float:
-    return utime.ticks_ms() * 1e-3
+def sleep(secs):
+    time.sleep_ms(int(secs * 1e3))
 
 
-def sleep(secs: float) -> None:
-    utime.sleep_ms(int(secs * 1e3))
-
-
-def randint(start: int, limit: int) -> int:
+def randint(start, limit):
     return start + random.getrandbits(30) % (limit - start + 1)

src/iptime.py

@@ -13,7 +13,6 @@
 # limitations under the License.
 import random
 import time
-from typing import Generator, Optional
 
 import urequests
 
@@ -21,7 +20,7 @@ import asynced
 import compat
 
 
-def _fetch() -> Optional[dict]:
+def _fetch():
     try:
         return urequests.get("http://worldtimeapi.org/api/ip").json()
     except OSError as ex:
@@ -36,7 +35,7 @@ def _jitter(mid: int) -> int:
     return compat.randint(mid, mid * 120 // 100)
 
 
-def _sync() -> Generator[Optional[dict], None, None]:
+def _sync() -> generator:
     while True:
         # Poll quickly until the first result comes in.
         while True:
@@ -65,12 +64,12 @@ def _get_day_sec(resp):
     return float(hms[0]) * 3600 + float(hms[1]) * 60 + float(hms[2])
 
 
-def day_sec() -> Generator[Optional[float], None, None]:
+def day_sec() -> generator:
     s = _sync()
     # Spin until the first result comes in.
     for got in s:
         if got is None:
-            yield None
+            yield None, None
             continue
         local = compat.monotonic()
         base = _get_day_sec(got)
@@ -78,10 +77,9 @@ def day_sec() -> Generator[Optional[float], None, None]:
             break
     good = got
 
-    assert base is not None
     for got in s:
         now = base + compat.monotonic() - local
-        yield now % (60 * 60 * 24)
+        yield now % (60 * 60 * 24), good
 
         if got is not None:
             # Update the baseline.
@@ -93,7 +91,7 @@ def day_sec() -> Generator[Optional[float], None, None]:
 
 
 def test():
-    for secs in day_sec():
+    for secs, meta in day_sec():
         print(secs)
         compat.sleep(0.3)
 

src/lib/typing.py

@@ -1,7 +0,0 @@
-Generator = None
-
-Optional = None
-
-Tuple = None
-
-Iterable = None

src/mqtt.py

@@ -1,166 +0,0 @@
-import socket
-
-import asynced
-
-from typing import Generator, Optional, Tuple
-
-_CONNECT = 1
-_CONNACK = 2
-_PUBLISH = 3
-_PUBACK = 4
-_PUBREC = 5
-_PUBREL = 6
-_PUBCOMP = 7
-_SUBSCRIBE = 8
-_SUBACK = 9
-_UNSUBSCRIBE = 10
-_UNSUBACK = 11
-_PINGREQ = 12
-_PINGRESP = 13
-_DISCONNECT = 14
-
-_DUP = 8
-_QOS = 2
-_RETAIN = 1
-
-_UPDATE_SECONDS = 120
-
-
-class Message:
-    def __init__(self, topic: str, value: str):
-        self.topic = topic
-        self.value = value
-
-    topic: str
-    value: str
-
-
-def _getch() -> Generator[None, Optional[int], int]:
-    """Returns the first non-None value sent to the generator"""
-    while True:
-        got = yield None
-        if got is not None:
-            return got
-
-
-def _get_packet() -> Generator[None, Optional[int], Tuple[int, bytearray]]:
-    """Decodes and returns the next packet"""
-    control = yield from _getch()
-    size = 0
-    shift = 0
-    while True:
-        got = yield from _getch()
-        size |= (got & 0x7F) << shift
-        shift += 7
-        if (got & 0x80) == 0:
-            break
-    payload = bytearray(size)
-    for i in range(len(payload)):
-        payload[i] = yield from _getch()
-    return control, payload
-
-
-def _encode_string(value: str) -> bytearray:
-    """Encodes a length-value string"""
-    encoded = value.encode()
-    return bytearray((len(encoded) >> 8, len(encoded) & 0xFF)) + encoded
-
-
-def _write_packet(
-    sock,
-    control: int,
-    payload: bytearray | bytes,
-    packet_id: Optional[int] = None,
-) -> None:
-    if packet_id is not None:
-        header = bytearray(
-            (control, len(payload) + 2, (packet_id >> 8) & 0xFF, packet_id & 0xFF)
-        )
-    else:
-        header = bytearray((control, len(payload)))
-    print("mqtt: >", header, payload)
-    sock.write(header + payload)
-
-
-def _send_connect(sock: socket.socket, username: str, password: str):
-    flags = 0x02
-    if username:
-        flags |= 0x80
-    if password:
-        flags |= 0x40
-    payload = (
-        _encode_string("MQTT")
-        + b"\x04"  # Protocol level
-        + bytearray((flags,))
-        + bytearray((0, _UPDATE_SECONDS * 2))  # Keep alive seconds
-        + _encode_string("")  # Client identifier
-    )
-    if username:
-        payload += _encode_string(username)
-    if password:
-        payload += _encode_string(password)
-    _write_packet(sock, _CONNECT << 4, payload)
-
-
-def _send_subscribe(sock: socket.socket, topic: str):
-    packet_id = hash(topic) & 0xFFFF
-    _write_packet(
-        sock,
-        (_SUBSCRIBE << 4) | 2,
-        _encode_string(topic) +
-        # QOS
-        b"\x00",
-        packet_id,
-    )
-
-
-def _send_publish(sock: socket.socket, topic: str, value: str):
-    _write_packet(sock, _PUBLISH << 4, _encode_string(topic) + value.encode())
-
-
-def _sender(sock: socket.socket, path: str) -> Generator[None, None, None]:
-    _send_subscribe(sock, path + "/#")
-
-    while True:
-        _send_publish(sock, path + "/available", "online")
-        yield from asynced.delay(_UPDATE_SECONDS)
-
-
-def _receiver() -> Generator[Optional[Message], Optional[int], None]:
-    while True:
-        control, payload = yield from _get_packet()
-        if (control >> 4) == _PUBLISH:
-            qos = (control // _QOS) & 3
-            topic_length = (payload[0] << 8) | payload[1]
-            topic = payload[2 : 2 + topic_length].decode()
-            has_packet_id = qos == 1 or qos == 2
-            packet_id_length = 2 if has_packet_id else 0
-            value = payload[2 + topic_length + packet_id_length :].decode()
-            print("mqtt: topic update:", topic, value)
-            yield Message(topic, value)
-
-
-def client(
-    sock: socket.socket,
-    path: str,
-    username: str = "",
-    password: str = "",
-) -> Generator[Optional[Message], Optional[int], None]:
-    _send_connect(sock, username, password)
-
-    connack, payload = yield from _get_packet()
-    if connack != _CONNACK << 4:
-        raise Exception("Expected CONNACK")
-
-    if len(payload) < 2:
-        raise Exception("CONNACK is too short")
-    if payload[1] != 0:
-        raise Exception("CONNACK has an error code")
-
-    receiver = _receiver()
-    sender = _sender(sock, path)
-
-    got = yield None
-    while True:
-        sender.send(None)
-        got = yield receiver.send(got)

src/wordclock.py

@@ -12,27 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import array
-import binascii
-import sys
-import socket
+import random
+import secrets
+import time
 
 import machine
 import neopixel
 import network
-import micropython
 
 import asynced
 import compat
 import iptime
-import mqtt
-import local_secrets
-
-from typing import Optional, Generator, Iterable, Tuple
-
-if "ESP32" in str(sys.implementation):
-    LED_BUILTIN = 2
-else:
-    LED_BUILTIN = 16
 
 # fmt: off
 RANGES = {
@@ -90,8 +80,7 @@ COLOUR = (200, 255, 200)
 # fmt: on
 
 
-def _split(secs: int) -> Tuple[str, str, str]:
-    """Converts a seconds-of-day into minutes, hours, and AM/PM"""
+def split(secs: int) -> tuple:
     secs = int(secs)
     mins = (secs // 60) % 60
     minute = mins // 5
@@ -111,11 +100,13 @@ class Frame:
     Max = 255
     Zeros = tuple([0] * (11 * 10))
 
-    def __init__(self, n: int = 11 * 10, pixels: Optional[array.array] = None):
-        self.pixels = pixels if pixels else list(self.Zeros)
+    def __init__(self, n: int = 11 * 10, pixels: list = None):
+        if pixels is None:
+            pixels = list(self.Zeros)
+        self.pixels = pixels
 
-    def set(self, idx: int, value: int) -> "Frame":
-        self.pixels[idx] = value
+    def set(self, idx: int) -> "Frame":
+        self.pixels[idx] = self.Max
         return self
 
     def __add__(self, other):
@@ -129,7 +120,6 @@ class Frame:
 
 @micropython.native
 def merge(f1: Frame, f2: Frame, num1: int, num2: int, den: int) -> Frame:
-    """Merges two frames together."""
     m = Frame.Max
     p1 = f1.pixels
     p2 = f2.pixels
@@ -142,27 +132,24 @@ def merge(f1: Frame, f2: Frame, num1: int, num2: int, den: int) -> Frame:
     return Frame(pixels=o)
 
 
-def _render(words: Iterable[str], brightness: int) -> Frame:
-    """Renders a list of words into a frame"""
+def render(words: list) -> Frame:
     f = Frame()
     for word in words:
         for w in word.split():
             idx = RANGES.get(w, None)
             if idx is not None:
                 for i in range(len(w)):
-                    f.set(idx + i, brightness)
+                    f.set(idx + i)
             else:
                 print("warning: %s is missing" % w)
     return f
 
 
-def _prefix() -> Tuple[str]:
-    """Returns a random suffix word such as 'dude'"""
+def prefix() -> tuple:
     return (ITS[compat.randint(0, len(ITS) - 1)],)
 
 
-def _show(f: Frame, n):
-    """Renders a frame to a NeoPixel handler"""
+def show(f: Frame, n):
     p = f.pixels
     buf = bytearray(len(p) * 3)
     r, g, b = COLOUR
@@ -176,96 +163,89 @@ def _show(f: Frame, n):
     n.write()
 
 
-def _scan() -> Generator[Frame, None, None]:
-    """Returns a stream of frames that scan across the LEDs"""
+def scan() -> generator:
     f = Frame()
     while True:
         for i in range(len(f.pixels)):
-            yield f.set(i, Frame.Max)
+            yield f.set(i)
             f = f.muldiv(80, 100)
 
 
-def _intensity(num: int, den: int) -> int:
+def intensity(num: int, den: int) -> int:
     idx = num * len(CIEL8) // den
     if idx >= len(CIEL8):
         return 255
     return CIEL8[idx]
 
 
-def _crossfade(src: Frame, dest: Frame, fade_time: int):
-    for at in asynced.wait(fade_time):
-        yield merge(
-            src,
-            dest,
-            _intensity(fade_time - at, fade_time),
-            _intensity(at, fade_time),
-            Frame.Max,
-        )
+def brightness(secs):
+    hour = int(secs) // 60 // 60
+    if hour >= 7 and hour < 22:
+        return 255
+
+    return 1200
 
 
-def _run(brightness_queue: list[int]) -> Generator[Optional[Frame], None, None]:
+def run() -> generator:
     words = None
-    fade_time = 2000
+    fade = 2000
     secs = iptime.day_sec()
-    brightness = 255
 
     # Flash until time is synced.
-    sc = _scan()
-    for s in secs:
-        if s is not None:
+    sc = scan()
+    for s, meta in secs:
+        if s is not None and meta is not None:
             break
         yield next(sc)
 
     src = Frame()
     while True:
-        changed = False
-        if brightness_queue:
-            brightness = brightness_queue[-1]
-            brightness_queue.clear()
-            changed = True
-
-        now = next(secs)
-        next_words = _split(now)
-        if words != next_words:
-            words = next_words
-            changed = True
-
-        if changed:
-            next_frame = _render(_prefix() + next_words, brightness)
-            yield from _crossfade(src, next_frame, fade_time)
-            src = next_frame
-        else:
+        yield None
+        s, m2 = next(secs)
+        nxt = split(s)
+        if nxt == words:
             yield from asynced.delay(2)
+            continue
+        dest = render(prefix() + nxt)
+        for at in asynced.wait(fade):
+            yield merge(
+                src,
+                dest,
+                intensity(fade - at, fade),
+                intensity(at, fade),
+                brightness(s),
+            )
+        words = nxt
+        src = dest
 
 
-def blink() -> Generator[None, None, None]:
-    led = machine.Pin(LED_BUILTIN, machine.Pin.OUT)
+def blink() -> generator:
+    led = machine.Pin(16, machine.Pin.OUT)
     while True:
-        led.on()
-        yield from asynced.delay(0.03)
         led.off()
+        yield from asynced.delay(0.03)
+        led.on()
         yield from asynced.delay(2.9)
 
 
-def bench() -> Generator[None, None, None]:
+def bench() -> generator:
     yield None
     i = 30
     while True:
         start = compat.monotonic()
-        for _ in range(i):
-            yield None
+        yield from range(i)
         elapsed = compat.monotonic() - start
         if elapsed > 0:
             print("%d in %.3f %.3f/1 %.1f FPS" % (i, elapsed, elapsed / i, i / elapsed))
 
 
-def _connect(wlan: network.WLAN) -> Generator[None, None, None]:
+def connect(wlan) -> generator:
     yield None
 
     while True:
         if not wlan.isconnected():
             wlan.active(True)
-            wlan.connect(local_secrets.WLAN_ESSID, local_secrets.WLAN_PASSWORD)
+            wlan.connect(secrets.WLAN_ESSID, secrets.WLAN_PASSWORD)
         else:
             # Override the DNS server as MicroPython and dnsmasq seem
             # to be incompatible.
@@ -274,64 +254,15 @@ def _connect(wlan: network.WLAN) -> Generator[None, None, None]:
         yield from asynced.delay(10)
 
 
-def _mqtt_client(
-    is_connected, brightness_queue: list[int]
-) -> Generator[None, None, None]:
-    while True:
-        yield from asynced.delay(3)
-
-        if not is_connected():
-            continue
-
-        sock = socket.socket()
-        try:
-            target = socket.getaddrinfo(local_secrets.MQTT_HOST, 1883)[0][-1]
-            print("mqtt: connecting to", target)
-            sock.connect(target)
-            sock.setblocking(False)
-
-            topic = "light/wc-" + binascii.hexlify(machine.unique_id()).decode()
-            client = mqtt.client(
-                sock, topic, local_secrets.MQTT_USERNAME, local_secrets.MQTT_PASSWORD
-            )
-            while True:
-                got = sock.read()
-                if not got:
-                    client.send(None)
-                    yield None
-                    continue
-
-                for ch in got:
-                    message = client.send(ch)
-                    if not message:
-                        continue
-                    client.send(None)
-                    if message.topic.endswith("/brightness"):
-                        brightness_queue.append(int(message.value))
-        except Exception as ex:
-            print("mqtt: exception:", ex)
-        finally:
-            print("mqtt: close")
-            sock.close()
-
-
 def main():
     num = 11 * 10
     n = neopixel.NeoPixel(machine.Pin(2), num)
     wlan = network.WLAN(network.STA_IF)
-    brightness_queue = []
-    routines = (
-        _connect(wlan),
-        _mqtt_client(wlan.isconnected, brightness_queue),
-        _run(brightness_queue),
-        blink(),
-        asynced.fps(30),
-        bench(),
-    )
+    routines = (connect(wlan), run(), blink(), asynced.fps(30), bench())
     while True:
         for r in routines:
             f = next(r)
             if f is None:
                 continue
             elif isinstance(f, Frame):
-                _show(f, n)
+                show(f, n)

third_party/micropython

@@ -1 +0,0 @@
-Subproject commit 678707c8b07323c5b914778708a2858387c3b60c