Updates

device_server.py

@@ -13,6 +13,7 @@ import re
 import socket
 import subprocess
 import threading
+import time
 
 from flask import Flask, jsonify, request
 
@@ -25,6 +26,7 @@ KIOSK_SCRIPT = "/root/display_test_nexio.py"
 
 _video_proc: subprocess.Popen | None = None
 _video_lock = threading.Lock()
+_kiosk_args: list[str] = ["python3", KIOSK_SCRIPT]   # updated when kiosk is started
 
 # ---------------------------------------------------------------------------
 # Register commands to execute on each GET /registers request.
@@ -89,16 +91,38 @@ def _parse_memtool_output(raw: str) -> list:
 
 @app.route("/display", methods=["PUT"])
 def control_display():
+    global _video_proc
     data  = request.get_json(force=True) or {}
     state = data.get("state", "").lower()
     if state == "on":
         with _video_lock:
-            if _video_proc is not None and _video_proc.poll() is None:
+            if "--static-pink" in _kiosk_args:
+                # Full kill+restart so the DSI controller goes through LP-11 → HS
+                # startup, giving the scope a clean LP trigger on Pass 1.
+                if _video_proc is not None and _video_proc.poll() is None:
+                    _video_proc.terminate()
+                    try:
+                        _video_proc.wait(timeout=3)
+                    except subprocess.TimeoutExpired:
+                        _video_proc.kill()
+                        _video_proc.wait()
+                time.sleep(0.15)   # let DSI reach LP-11
+                try:
+                    log = open("/tmp/kiosk.log", "w")
+                    _video_proc = subprocess.Popen(
+                        _kiosk_args, stdout=log,
+                        stderr=subprocess.STDOUT, env=os.environ.copy(),
+                    )
+                except Exception as e:
+                    return jsonify({"error": f"restart failed: {e}"}), 500
+                return jsonify({"status": "static-pink restarted"}), 200
+            elif _video_proc is not None and _video_proc.poll() is None:
+                # Video mode: UDP trigger switches clip and reloads pipeline
                 _sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
                 _sock.sendto(b'switch', ('127.0.0.1', 5001))
                 _sock.close()
                 return jsonify({"status": "video switched"}), 200
-        # fallback when video is not running
+        # fallback when no kiosk is running
         os.system("echo 0 > /sys/class/graphics/fb0/blank")
         return jsonify({"status": "Display ON"}), 200
     elif state == "off":
@@ -216,6 +240,7 @@ def control_video():
                 mode = data.get("mode", "")
                 if mode == "static-pink":
                     cmd.append("--static-pink")
+                _kiosk_args[:] = cmd   # persist so control_display knows the mode
                 log = open("/tmp/kiosk.log", "w")
                 _video_proc = subprocess.Popen(
                     cmd,

display_test_nexio.py

@@ -185,6 +185,10 @@ def play_static_color(r: int, g: int, b: int):
 
     Uses videotestsrc pattern=solid-color so every DSI line carries the same
     repeating RGB triplet — any deviation in the proto_decoder output is a DSI fault.
+
+    Listens on UDP port 5001 for a trigger packet (same as play_kiosk), which
+    briefly cycles the pipeline through READY→PLAYING to generate the LP→HS
+    startup sequence that the scope captures on Pass 1.
     """
     Gst.init(None)
 
@@ -214,6 +218,22 @@ def play_static_color(r: int, g: int, b: int):
                 old, new, _ = msg.parse_state_changed()
                 print(f"Pipeline: {old.value_nick} -> {new.value_nick}", flush=True)
 
+    def _restart_pipeline():
+        """Cycle READY→PLAYING to produce the LP→HS startup the scope triggers on."""
+        print("UDP trigger: restarting pipeline (READY → PLAYING)", flush=True)
+        pipeline.set_state(Gst.State.READY)
+        pipeline.set_state(Gst.State.PLAYING)
+        return False  # GLib.idle_add one-shot
+
+    def _udp_listener():
+        sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+        sock.bind(('127.0.0.1', 5001))
+        while True:
+            sock.recv(64)
+            GLib.idle_add(_restart_pipeline)
+
+    threading.Thread(target=_udp_listener, daemon=True).start()
+
     bus.connect("message", on_message)
     pipeline.set_state(Gst.State.PLAYING)
     print(f"Static colour R:{r} G:{g} B:{b} (0x{argb:08X}) — running", flush=True)