From fb8a408f936621e70f58540a9ad5d4acbe8479f1 Mon Sep 17 00:00:00 2001
From: stswangzhiping <59632378+stswangzhiping@users.noreply.github.com>
Date: Fri, 3 Apr 2026 19:01:14 +0800
Subject: [PATCH] =?UTF-8?q?fix(led):=20VFD=20=E7=AE=A1=E9=81=93=E7=94=A8?=
 =?UTF-8?q?=20O=5FNONBLOCK=20=E9=98=B2=E6=AD=A2=E4=BA=8B=E4=BB=B6=E5=BE=AA?=
 =?UTF-8?q?=E7=8E=AF=E9=98=BB=E5=A1=9E?=
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FIFO 写入改为 O_WRONLY | O_NONBLOCK：
- 无读端（vfdservice 关闭读端后）openSync 立即抛 ENXIO 而非永久阻塞
- showPin blink timer 每 500-1000ms 自动重试，vfdservice 恢复读后
  即可成功显示 PIN，彻底解决"长时间激活后解绑 PIN 不闪"问题

同时移除 66b94d8 加的 showTime keepalive：
- keepalive 用的也是阻塞 openSync，vfdservice 关闭读端时反而会
  在 setTimeout 回调里阻塞整个事件循环，比不加更危险

Made-with: Cursor
---
 lib/led.js | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/lib/led.js b/lib/led.js
index c778597..a03debf 100644
--- a/lib/led.js
+++ b/lib/led.js
@@ -46,6 +46,9 @@ function vfdTitleNormalize(raw) {
     .padEnd(4, ' ');
 }
 
+// O_WRONLY | O_NONBLOCK：FIFO 无读端时立即抛 ENXIO 而非永久阻塞事件循环
+const VFD_OPEN_FLAGS = fs.constants.O_WRONLY | fs.constants.O_NONBLOCK;
+
 function writeVfdPipeTitle(text4) {
   if (!vfdPipePresent()) return;
   const seg = vfdTitleNormalize(text4);
@@ -58,7 +61,7 @@ function writeVfdPipeTitle(text4) {
     return;
   }
   try {
-    const fd = fs.openSync(VFD_PIPE, 'w');
+    const fd = fs.openSync(VFD_PIPE, VFD_OPEN_FLAGS);
     fs.writeSync(fd, data);
     fs.closeSync(fd);
   } catch (e) {
@@ -71,7 +74,7 @@ function writeVfdPipeClock() {
   const data = Buffer.alloc(VFD_BUF_SIZE);
   data.writeUInt16LE(VFD_MODE_CLOCK, 0);
   try {
-    const fd = fs.openSync(VFD_PIPE, 'w');
+    const fd = fs.openSync(VFD_PIPE, VFD_OPEN_FLAGS);
     fs.writeSync(fd, data);
     fs.closeSync(fd);
   } catch (e) {
@@ -256,13 +259,6 @@ class Display {
     this._stopBlink();
     writeVfdPipeClock();
     log.info('display', '显示屏 → 时间');
-    // 每 30s 刷新一次，保持 vfdservice 持续从管道读取，
-    // 防止长时间无写入后管道"冷却"，导致后续 showPin 写入阻塞
-    const refresh = () => {
-      writeVfdPipeClock();
-      this._blinkTimer = setTimeout(refresh, 30_000);
-    };
-    this._blinkTimer = setTimeout(refresh, 30_000);
   }
 
   showPin(pin) {