From ce7f9f028e8eea958617edfa955d1e05a124a42d Mon Sep 17 00:00:00 2001
From: stswangzhiping <59632378+stswangzhiping@users.noreply.github.com>
Date: Thu, 19 Mar 2026 08:52:52 +0800
Subject: [PATCH] =?UTF-8?q?fix(display):=20=E6=94=B9=E7=94=A8=20#m2=20?=
 =?UTF-8?q?=E6=A8=A1=E5=BC=8F=E6=98=BE=E7=A4=BA=20PIN=20=E6=95=B0=E5=AD=97?=
 =?UTF-8?q?=EF=BC=8C=E4=BF=AE=E5=A4=8D=20#m3=20=E4=B8=8D=E6=94=AF=E6=8C=81?=
 =?UTF-8?q?=E6=95=B0=E5=AD=97=E5=AF=BC=E8=87=B4=E7=9A=84=E6=98=BE=E7=A4=BA?=
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Made-with: Cursor
---
 lib/led.js | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/lib/led.js b/lib/led.js
index 94a972b..9ba89cd 100644
--- a/lib/led.js
+++ b/lib/led.js
@@ -113,15 +113,14 @@ class Display {
   showPinMiddle4(pin) {
     const s = String(pin || '');
     const mid4 = s.length >= 6 ? s.slice(1, 5) : s.padStart(4, '0').slice(-4);
-    // 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);
+    // #m2 模式支持数字，4字符直接跟在模式号后（无空格）
+    this._write('#m2' + mid4);
     log.info('display', `显示屏 → PIN 中间4位: ${mid4}`);
   }
 
   _write(val) {
     try {
-      // 用 printf 避免 echo 的换行符导致 sysfs 写入失败
-      execSync(`printf '%s' "${val}" | tee ${DISPLAY_PATH} > /dev/null`, { timeout: 3000 });
+      execSync(`echo "${val}" | tee ${DISPLAY_PATH} > /dev/null`, { timeout: 3000 });
     } catch (e) {
       log.warn('display', `写入失败: ${e.message}`);
     }