feat: add Chacon 54662 support

Author: fcrespel

README.md

@@ -1,6 +1,6 @@
 # Remote Control REST API
 
-REST API to use an RF 433 MHz transmitter as a remote control. It currently only supports the Chacon DIO 1.0 protocol.
+REST API to use an RF 433 MHz transmitter as a remote control. It currently only supports the Chacon DIO 1.0 and Chacon 54662 protocols.
 
 It has only been tested on an ODROID-C4 board and uses an ODROID-specific WiringPi version. It should be easy to adapt it for other boards (e.g. Raspberry Pi).
 

app/chacon54662/__init__.py

@@ -0,0 +1,28 @@
+import argparse
+
+import odroid_wiringpi as wiringpi
+
+from .protocol import transmit
+
+
+def parse_args():
+    parser = argparse.ArgumentParser(description="Chacon 54662 remote control")
+    parser.add_argument("-g", "--gpio", help="GPIO WiringPi pin number (default: 0)", type=int, choices=range(0, 30), metavar="[0-29]", default=0)
+    parser.add_argument("-w", "--word", help="24-bit code word", type=int, required=True)
+    parser.add_argument("-r", "--repeat", help="Number of times to repeat the message (default: 1)", type=int, default=1)
+    return parser.parse_args()
+
+
+def main():
+    args = parse_args()
+
+    if wiringpi.wiringPiSetup() == -1:
+        raise Exception("Failed to initialize WiringPi")
+    wiringpi.pinMode(args.gpio, wiringpi.OUTPUT)
+
+    for _ in range(args.repeat):
+        transmit(args.gpio, args.word)
+
+
+if __name__ == "__main__":
+    main()

app/chacon54662/cli.py

@@ -0,0 +1,46 @@
+import odroid_wiringpi as wiringpi
+
+TIME_HIGH_LOCK = 290
+TIME_LOW_LOCK = 2400
+
+TIME_HIGH_0 = 1070
+TIME_LOW_0 = 470
+
+TIME_HIGH_1 = 290
+TIME_LOW_1 = 1250
+
+
+def sendBit(pin: int, b: bool):
+    if b:
+        wiringpi.digitalWrite(pin, wiringpi.HIGH)
+        wiringpi.delayMicroseconds(TIME_HIGH_1)
+        wiringpi.digitalWrite(pin, wiringpi.LOW)
+        wiringpi.delayMicroseconds(TIME_LOW_1)
+    else:
+        wiringpi.digitalWrite(pin, wiringpi.HIGH)
+        wiringpi.delayMicroseconds(TIME_HIGH_0)
+        wiringpi.digitalWrite(pin, wiringpi.LOW)
+        wiringpi.delayMicroseconds(TIME_LOW_0)
+
+
+def sendWord(pin: int, word: int, bits: int):
+    for bit in reversed(range(bits)):
+        if word & (1 << bit):
+            sendBit(pin, True)
+        else:
+            sendBit(pin, False)
+
+
+def transmit(pin: int, word: int):
+    for _ in range(4):
+        # Code word (24 bits)
+        sendWord(pin, word, 24)
+
+        # End lock
+        wiringpi.digitalWrite(pin, wiringpi.HIGH)
+        wiringpi.delayMicroseconds(TIME_HIGH_LOCK)
+        wiringpi.digitalWrite(pin, wiringpi.LOW)
+        wiringpi.delayMicroseconds(TIME_LOW_LOCK)
+
+    # Delay before next transmission
+    wiringpi.delay(10)

app/chacon54662/protocol.py

@@ -0,0 +1,24 @@
+from fastapi import APIRouter, Body, Path, Query, Request
+
+from .protocol import transmit
+
+router = APIRouter(prefix="/chacon54662", tags=["chacon54662"])
+
+
+@router.get("/state/{stateKey}", summary="Get button state")
+async def get_state(request: Request, stateKey: str = Path(pattern="[a-z0-9-]")):
+    """Get the current state for a given stateKey"""
+    if stateKey in request.app.state.chacon54662:
+        return request.app.state.chacon54662[stateKey]
+    else:
+        return 0
+
+
+@router.put("/word", summary="Send 24-bit code word")
+async def put_word(request: Request, word: str = Body(pattern="[01]{24}"), repeat: int = 3,
+                   stateKey: str = Query(default=None, pattern="[a-z0-9-]"), stateValue: int = Query(default=None, ge=0, le=1)):
+    """Send a 24-bit code word and optionally save state in a given stateKey"""
+    if stateKey is not None and stateValue is not None:
+        request.app.state.chacon54662[stateKey] = stateValue
+    for _ in range(repeat):
+        transmit(request.app.state.gpio, int(word, 2))

app/chacon54662/routes.py

@@ -6,6 +6,7 @@
 
 import odroid_wiringpi as wiringpi
 import uvicorn
+from chacon54662.routes import router as chacon54662_router
 from chacondio10.routes import router as chacondio10_router
 from fastapi import FastAPI
 from fastapi.responses import RedirectResponse
@@ -22,8 +23,10 @@ async def lifespan(app: FastAPI):
     yield
 
 app = FastAPI(title="Remote Control REST API", description="REST API to use an RF 433 MHz transmitter as a remote control", version="1.0", lifespan=lifespan)
+app.include_router(chacon54662_router)
 app.include_router(chacondio10_router)
 app.state.gpio = 0
+app.state.chacon54662 = {}
 app.state.chacondio10 = {}