Fix 3.5C backlight and GT911: BL=GPIO27, INT left as input after reset.

Black screen on cyd_35r came from TFT_BL=21; align pins/platformio/touch with CYD_PROJECT_GUIDE and export firmware/cyd_35r.

Co-authored-by: Cursor <cursoragent@cursor.com>

firmware/README.md

@@ -1,17 +1,16 @@
 # 预编译固件
 
-目录：[`cyd/`](cyd/)
+| 目录 | 板子 | 功能 |
+|------|------|------|
+| [`cyd/`](cyd/) | 2.8" ESP32-2432S028R（ILI9341 + XPT2046） | 口哨 GPIO22 + SoftSPI 触控 + LVGL |
+| [`cyd_35r/`](cyd_35r/) | 3.5" ESP32-3248S035C（ST7796 + GT911，BL=27） | 口哨 GPIO22 + 电容触控 + LVGL |
 
-| 项 | 内容 |
-|----|------|
-| 板子 | CYD ESP32-2432S028R（ILI9341） |
-| 功能 | 三针口哨传感器（GPIO22 高低电平）+ SoftSPI 触控 + LVGL |
-| 版本 | 见同目录 `VERSION.txt` / `meta.json` |
+版本见各目录 `VERSION.txt` / `meta.json`。
 
 ## 刷写
 
 ```powershell
-cd firmware\cyd
+cd firmware\cyd        # 或 firmware\cyd_35r
 .\flash.ps1
 # 或 .\flash.ps1 -Port COM4
 ```
@@ -19,6 +18,7 @@ cd firmware\cyd
 ## 重新打包
 
 ```powershell
-.\firmware\export_from_build.ps1
-.\firmware\export_from_build.ps1 -SkipBuild
+.\firmware\export_from_build.ps1                 # 2.8
+.\firmware\export_from_build.ps1 -Env cyd_35r    # 3.5
+.\firmware\export_from_build.ps1 -SkipBuild      # 跳过编译
 ```

firmware/cyd_35r/VERSION.txt

@@ -0,0 +1,15 @@
+name: CYD voicechecktest (cyd_35r)
+git: 2beb80a
+date: 2026-10-25
+board: ESP32-3248S035 (ST7796)
+flash_size: 4MB
+offsets:
+  0x1000  bootloader.bin
+  0x8000  partitions.bin
+  0xe000  boot_app0.bin
+  0x10000 firmware.bin
+sha256:
+  bootloader.bin  3D234A7471F67B013686DABD4DEE7C1FA915C9928463616A94BC9297ACF1ABF8
+  boot_app0.bin   F94C5D786A7A8FAB06AC5D10E33BF37711A6697636DC037559EA19CC410A17F0
+  firmware.bin    4E42FBC004B05D8088CD8B7D7949FEADF70F4CDF768AF1EE55766C5B5FAA4E05
+  partitions.bin  148B959CBFF1C38AA8E1D5C0BA9D612C54997B945E56A63F41223EEF650653A1

firmware/cyd_35r/flash.bat

@@ -0,0 +1,5 @@
+@echo off
+setlocal
+cd /d "%~dp0"
+powershell -NoProfile -ExecutionPolicy Bypass -File "%~dp0flash.ps1" %*
+exit /b %ERRORLEVEL%

firmware/cyd_35r/flash.ps1

@@ -0,0 +1,98 @@
+# Flash archived CYD TF+Speaker firmware (no rebuild needed)
+# Usage:
+#   .\flash.ps1
+#   .\flash.ps1 -Port COM5
+#   .\flash.ps1 -Port COM5 -Baud 460800
+
+param(
+  [string]$Port = "",
+  [int]$Baud = 921600
+)
+
+$ErrorActionPreference = "Stop"
+$here = Split-Path -Parent $MyInvocation.MyCommand.Path
+Set-Location $here
+
+function Find-Esptool {
+  $pio = Get-Command pio -ErrorAction SilentlyContinue
+  if (-not $pio) {
+    $pioPath = Join-Path $env:USERPROFILE "AppData\Local\Programs\Python\Python312\Scripts\pio.exe"
+    if (Test-Path $pioPath) {
+      $env:Path = "$(Split-Path $pioPath);$env:Path"
+      $pio = Get-Command pio -ErrorAction SilentlyContinue
+    }
+  }
+  if ($pio) {
+    $pkg = Join-Path $env:USERPROFILE ".platformio\packages\tool-esptoolpy\esptool.py"
+    if (Test-Path $pkg) { return @{ Kind = "py"; Path = $pkg } }
+  }
+  $py = Get-Command python -ErrorAction SilentlyContinue
+  if ($py) {
+    try {
+      & python -c "import esptool" 2>$null
+      if ($LASTEXITCODE -eq 0) { return @{ Kind = "mod"; Path = "esptool" } }
+    } catch {}
+  }
+  $esp = Get-Command esptool.py -ErrorAction SilentlyContinue
+  if ($esp) { return @{ Kind = "py"; Path = $esp.Source } }
+  return $null
+}
+
+if (-not $Port) {
+  $ports = @()
+  try {
+    Add-Type -AssemblyName System.IO.Ports -ErrorAction SilentlyContinue | Out-Null
+    $ports = [System.IO.Ports.SerialPort]::GetPortNames() | Sort-Object
+  } catch {}
+  if (-not $ports -or $ports.Count -eq 0) {
+    $ports = Get-CimInstance Win32_SerialPort -ErrorAction SilentlyContinue |
+      Select-Object -ExpandProperty DeviceID | Sort-Object
+  }
+  if (-not $ports -or $ports.Count -eq 0) {
+    Write-Error "No serial ports found. Plug in the CYD USB cable, then retry with -Port COMx"
+  }
+  if ($ports.Count -eq 1) {
+    $Port = $ports[0]
+  } else {
+    Write-Host "Available ports: $($ports -join ', ')"
+    $Port = $ports[-1]
+    Write-Host "Using last port: $Port (override with -Port)"
+  }
+}
+
+$tool = Find-Esptool
+if (-not $tool) {
+  Write-Error "esptool not found. Install PlatformIO (`pio`) or: pip install esptool"
+}
+
+$needed = @("bootloader.bin", "partitions.bin", "boot_app0.bin", "firmware.bin")
+foreach ($f in $needed) {
+  if (-not (Test-Path (Join-Path $here $f))) {
+    Write-Error "Missing $f — run ..\export_from_build.ps1 from repo root first"
+  }
+}
+
+$argsCommon = @(
+  "--chip", "esp32",
+  "--port", $Port,
+  "--baud", "$Baud",
+  "--before", "default_reset",
+  "--after", "hard_reset",
+  "write_flash", "-z",
+  "--flash_mode", "dio",
+  "--flash_freq", "40m",
+  "--flash_size", "4MB",
+  "0x1000", "bootloader.bin",
+  "0x8000", "partitions.bin",
+  "0xe000", "boot_app0.bin",
+  "0x10000", "firmware.bin"
+)
+
+Write-Host "Flashing $here -> $Port @ $Baud"
+if ($tool.Kind -eq "mod") {
+  & python -m esptool @argsCommon
+} else {
+  & python $tool.Path @argsCommon
+}
+if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+Write-Host "Done. Open serial monitor at 115200 if needed."

firmware/cyd_35r/media/preview.html

@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8" />
+<title>Whistle / Sound</title>
+<style>
+
+  *{box-sizing:border-box;margin:0;padding:0}
+  html,body{width:320px;height:240px;overflow:hidden;background:#000;margin:0}
+  .bezel{width:320px;height:240px;background:#1a1408}
+  .screen{width:320px;height:240px;background:#0A1016;color:#EAF0F6;font:12px/1.2 system-ui,sans-serif;position:relative;overflow:hidden}
+  .muted{color:#7A8B9C}.ok{color:#3DDC97}.bad{color:#E85D4C}.acc{color:#4FC3F7}.amber{color:#FFB74D}
+  .btn{border:0;border-radius:8px;background:#243140;color:#EAF0F6;font-weight:600}
+  .btn.acc{background:#1A4A6E}.btn.on{background:#1B5E4A}.btn.warn{background:#6B3A1E}
+
+
+  .t{position:absolute;left:0;right:0;top:8px;text-align:center;font-size:18px;font-weight:700}
+  .pin{position:absolute;left:0;right:0;top:36px;text-align:center}
+  .st{position:absolute;left:0;right:0;top:64px;text-align:center;font-size:32px;font-weight:800}
+  .lvl{position:absolute;left:0;right:0;top:108px;text-align:center;font-size:11px}
+  .bar{position:absolute;left:24px;right:24px;top:130px;height:16px;background:#2A3340;border-radius:4px;overflow:hidden}
+  .bar>i{display:block;height:100%;width:18%;background:#3DDC97}
+  .hits{position:absolute;left:0;right:0;top:158px;text-align:center}
+  .act{position:absolute;left:90px;width:140px;bottom:12px;height:44px}
+
+
+/* CYD 3.5" full-bleed: non-uniform scale matches firmware UX()/UY(). */
+html,body{width:480px!important;height:320px!important;overflow:hidden!important;background:#000!important;margin:0!important;padding:0!important}
+.cyd35-scale{width:320px;height:240px;transform:scale(1.5,1.3333333333);transform-origin:0 0;overflow:hidden}
+</style>
+</head>
+<body>
+<div class="cyd35-scale">
+
+<div class="bezel"><div class="screen" id="s">
+
+  <div class="t">Whistle / Sound</div>
+  <div class="pin muted">OUT -&gt; GPIO22  (H/L)</div>
+  <div class="st">QUIET</div>
+  <div class="lvl muted">pin: LOW  -&gt; idle</div>
+  <div class="bar"><i></i></div>
+  <div class="hits muted">hits: 7</div>
+  <button class="btn act" type="button">Reset</button>
+
+</div></div>
+
+</div>
+</body>
+</html>

firmware/cyd_35r/meta.json

@@ -0,0 +1,20 @@
+{
+  "boardId": "esp32-3248s035",
+  "name": "CYD Whistle Sound Sensor (3.5\")",
+  "summary": "3-pin whistle module on GPIO22: digital H/L detect, hit count, Reset",
+  "description": "ST7796 + GT911 capacitive + LVGL 480x320. BL=GPIO27. OUT->GPIO22 high/low (default active HIGH). QUIET/SOUND UI, debounced hits, no dB (digital only).",
+  "tags": [
+    "sound",
+    "whistle",
+    "digital",
+    "gpio22",
+    "touch",
+    "lvgl",
+    "cyd",
+    "cyd_35r",
+    "gt911"
+  ],
+  "media": {
+    "preview": "media/preview.html"
+  }
+}