From 33046948b994ac8620c337de4ffd029029688cb5 Mon Sep 17 00:00:00 2001
From: stswangzhiping <59632378+stswangzhiping@users.noreply.github.com>
Date: Thu, 19 Mar 2026 08:37:00 +0800
Subject: [PATCH] =?UTF-8?q?fix(display):=20=E7=94=A8=20printf=20=E4=BB=A3?=
 =?UTF-8?q?=E6=9B=BF=20echo=EF=BC=8C=E4=BF=AE=E5=A4=8D=20VFD=20=E5=86=99?=
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Made-with: Cursor
---
 lib/led.js | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/lib/led.js b/lib/led.js
index ca24380..94a972b 100644
--- a/lib/led.js
+++ b/lib/led.js
@@ -97,9 +97,9 @@ const DISPLAY_PATH = '/sys/devices/platform/openvfd/attr/led';
  *   #s1         系统时钟模式，显示当前时间
  */
 class Display {
-  /** 网络断开 / AP 模式 → 显示 "AP " */
+  /** 网络断开 / AP 模式 → 显示 "AP  " */
   showAP() {
-    this._write('#m3 AP ');
+    this._write('#m3AP  ');
     log.info('display', '显示屏 → AP');
   }
 
@@ -113,14 +113,15 @@ class Display {
   showPinMiddle4(pin) {
     const s = String(pin || '');
     const mid4 = s.length >= 6 ? s.slice(1, 5) : s.padStart(4, '0').slice(-4);
-    this._write('#m3 ' + mid4);
+    // 不加空格分隔符，内容直接跟在 #m3 后，否则空格占用第一个显示位
+    this._write('#m3' + mid4);
     log.info('display', `显示屏 → PIN 中间4位: ${mid4}`);
   }
 
   _write(val) {
     try {
-      // 用 shell 管道写入，与 echo "..." | tee ... 行为完全一致
-      execSync(`echo "${val}" | tee ${DISPLAY_PATH} > /dev/null`, { timeout: 3000 });
+      // 用 printf 避免 echo 的换行符导致 sysfs 写入失败
+      execSync(`printf '%s' "${val}" | tee ${DISPLAY_PATH} > /dev/null`, { timeout: 3000 });
     } catch (e) {
       log.warn('display', `写入失败: ${e.message}`);
     }