Fix 3.5C board pins per CYD guide: BL=27, GY30 SCL=21.

Correct black-screen backlight, free GPIO21 after GT911 init (Wire1), export/flash cyd_35r package. Co-authored-by: Cursor <cursoragent@cursor.com>
2026-10-25 11:19:52 +08:00
parent 604fa26f04
commit d81383aaf6
18 changed files with 573 additions and 81 deletions
--- a/README.md
+++ b/README.md
@@ -1,20 +1,24 @@
 # CYD GY30 光照仪表盘

-ESP32 Cheap Yellow Display（ESP32-2432S028R）+ GY30（BH1750）+ LVGL 光照仪表盘。
+ESP32 Cheap Yellow Display + GY30（BH1750）+ LVGL 光照仪表盘。

-布局与交互参考同目录下的 [temperature](../temperature) / [sgp30test](../sgp30test)。
+默认 **2.8"**（`cyd_28r`）；可选 **3.5C**（`cyd_35r`）。布局与交互参考 [temperature](../temperature) / [sgp30test](../sgp30test)；板级约定见 [CYD_PROJECT_GUIDE.md](../CYD_PROJECT_GUIDE.md)。

 ## 硬件

-| 项目 | 说明 |
-|------|------|
-| 板子 | CYD ESP32-2432S028R（2.8" ILI9341） |
-| 传感器 | GY30 / BH1750（光照 lux） |
-| SDA | **GPIO22** |
-| SCL | **GPIO27** |
-| 供电 | USB 5V；传感器接 **3.3V** |
+| 项目 | 2.8"（默认 `cyd_28r`） | 3.5C（`cyd_35r`） |
+|------|------------------------|-------------------|
+| 板子 | ESP32-2432S028R（ILI9341） | ESP32-3248S035C（ST7796） |
+| 触控 | XPT2046 SoftSPI | GT911 I2C（Wire1） |
+| 背光 | **GPIO21** | **GPIO27** |
+| GY30 SDA | **GPIO22** | **GPIO22**（不变） |
+| GY30 SCL | **GPIO27** | **GPIO21**（2.8 的 27→21） |
+| 供电 | USB 5V；传感器 **3.3V** | 同左 |

-接线：`VCC→3.3V`，`GND→GND`，`SDA→GPIO22`，`SCL→GPIO27`。
+接线：
+
+- **2.8**：`VCC→3.3V`，`GND→GND`，`SDA→GPIO22`，`SCL→GPIO27`
+- **3.5**：`VCC→3.3V`，`GND→GND`，`SDA→GPIO22`，`SCL→GPIO21`（勿接 27，那是背光）

 ## 功能

@@ -29,33 +33,42 @@ ESP32 Cheap Yellow Display（ESP32-2432S028R）+ GY30（BH1750）+ LVGL 光照
 依赖 [PlatformIO](https://platformio.org/)。

 ```bash
+# 2.8"
 pio run -e cyd_28r -t upload
-pio device monitor -b 115200
+
+# 3.5"
+pio run -e cyd_35r -t upload
 ```

 ### 预编译固件

 ```powershell
-cd firmware\cyd_28r
+cd firmware\cyd_28r   # 或 cyd_35r
 .\flash.ps1
 ```

-源码更新后重新打包：`.\firmware\export_from_build.ps1`。
+源码更新后重新打包：
+
+```powershell
+.\firmware\export_from_build.ps1              # 2.8
+.\firmware\export_from_build.ps1 -Env cyd_35r # 3.5
+```

 | 环境 | 适用 |
 |------|------|
-| `cyd_28r` | 标准 ILI9341 CYD（默认） |
+| `cyd_28r` | 标准 2.8" ILI9341 CYD（默认） |
 | `cyd_28r_inv` | 颜色反相 / 发白 |
 | `cyd_28_st7789` | USB-C 双口 / ST7789 变体 |
+| `cyd_35r` | 3.5" ESP32-3248S035C（ST7796 + GT911） |

 ## 项目结构

 ```
-platformio.ini                 # 板级与库依赖
-include/lv_conf.h              # LVGL 配置
-src/main.cpp                   # 仪表盘主程序
-scripts/exclude_lvgl_asm.py    # 排除 ESP32 不兼容的 LVGL ASM
-firmware/                      # 预编译固件
+platformio.ini                 # 板级与库依赖（含 cyd_35r）
+include/lv_conf.h / touch.h
+src/main.cpp / touch.cpp
+scripts/exclude_lvgl_asm.py
+firmware/cyd_28r/  firmware/cyd_35r/
 README.md
 ```

@@ -63,5 +76,6 @@ README.md

 | 日期 | 说明 |
 |------|------|
-| 2026-10-20 | 初版：参考 temperature/sgp30test，GY30(BH1750) SDA=GPIO22 / SCL=GPIO27，LUX/LEVEL 双表盘、场景条、趋势图 |
+| 2026-10-20 | 初版：GY30(BH1750) SDA=GPIO22 / SCL=GPIO27，LUX/LEVEL 双表盘 |
 | 2026-10-20 | 增加 `meta.json` 与 `media/preview.html`，供 cydweb 本地目录展示 |
+| 2026-10-25 | 按 CYD_PROJECT_GUIDE 修正 3.5：背光 GPIO27、GY30 SCL=GPIO21、GT911 Wire1、导出/刷写 `cyd_35r` |
--- a/firmware/README.md
+++ b/firmware/README.md
@@ -1,14 +1,16 @@
 # 预编译固件（可随时刷写）

-当前归档目录：[`cyd_28r/`](cyd_28r/)
+| 目录 | 板子 |
+|------|------|
+| [`cyd_28r/`](cyd_28r/) | CYD ESP32-2432S028R（2.8" ILI9341），GY30 → SDA=GPIO22 / SCL=GPIO27 |
+| [`cyd_35r/`](cyd_35r/) | CYD ESP32-3248S035C（3.5" ST7796 + GT911），GY30 → SDA=GPIO22 / SCL=GPIO21 |

-对应板子：**CYD ESP32-2432S028R**（ILI9341），GY30 → SDA=GPIO22 / SCL=GPIO27。  
-版本信息见 [`cyd_28r/VERSION.txt`](cyd_28r/VERSION.txt)。
+版本信息见各目录 `VERSION.txt`。

 ## 直接刷写（无需重新编译）

 ```powershell
-cd firmware\cyd_28r
+cd firmware\cyd_28r   # 或 cyd_35r
 .\flash.ps1
 # 或指定端口
 .\flash.ps1 -Port COM3
@@ -23,5 +25,6 @@ cd firmware\cyd_28r
 在仓库根目录：

 ```powershell
-.\firmware\export_from_build.ps1
+.\firmware\export_from_build.ps1              # 2.8
+.\firmware\export_from_build.ps1 -Env cyd_35r # 3.5
 ```
--- a/firmware/cyd_35r/VERSION.txt
+++ b/firmware/cyd_35r/VERSION.txt
@@ -0,0 +1,15 @@
+name: CYD gy30test (cyd_35r)
+git: 604fa26
+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    531415EDA642DD3A6E8CAA0B6D1F42E3EF653C28BC8DC19A359FE45E0BFD3463
+  partitions.bin  0A8B5720E7B77FF11F1462458C3A509DEE79224E5279898F26D6A2E3AE0517B7
--- a/firmware/cyd_35r/boot_app0.bin
+++ b/firmware/cyd_35r/boot_app0.bin
--- a/firmware/cyd_35r/bootloader.bin
+++ b/firmware/cyd_35r/bootloader.bin
--- a/firmware/cyd_35r/firmware.bin
+++ b/firmware/cyd_35r/firmware.bin
--- a/firmware/cyd_35r/flash.bat
+++ b/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%
--- a/firmware/cyd_35r/flash.ps1
+++ b/firmware/cyd_35r/flash.ps1
@@ -0,0 +1,85 @@
+# Flash archived CYD climate 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 {
+  $pio = Get-Command pio -ErrorAction SilentlyContinue
+  if ($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 $tool) {
+  Write-Error "esptool not found. Install PlatformIO (`pio`) or: pip install esptool"
+}
+
+$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."
+
--- a/firmware/cyd_35r/media/media/preview.html
+++ b/firmware/cyd_35r/media/media/preview.html
@@ -0,0 +1,82 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8" />
+<meta name="viewport" content="width=320" />
+<title>CLIMATE</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:#0A1018;color:#F2F5FA;
+    font:12px/1.2 system-ui,sans-serif;position:relative;overflow:hidden;
+  }
+  .hdr{display:flex;align-items:center;gap:8px;padding:4px 8px;height:24px}
+  .hdr b{font-size:14px;font-weight:700}
+  .hdr .up{color:#7E90A8}
+  .hdr .sp{margin-left:auto;display:flex;align-items:center;gap:6px;color:#7E90A8}
+  .led{width:9px;height:9px;border-radius:50%;background:#4CAF7A}
+  .row{display:flex;gap:6px;padding:0 8px}
+  .panel{
+    flex:1;height:118px;background:#121C2A;border:1px solid #1E2C40;
+    border-radius:6px;padding:6px 8px;position:relative;
+  }
+  .cap{color:#7E90A8;font-size:11px}
+  .gauge{
+    width:90px;height:90px;margin:4px auto 0;border-radius:50%;
+    background:conic-gradient(#3DBF8C 0 70%, #243247 0);
+    mask:radial-gradient(farthest-side,transparent 62%,#000 63%);
+    -webkit-mask:radial-gradient(farthest-side,transparent 62%,#000 63%);
+  }
+  .panel.hum .gauge{background:conic-gradient(#3DB8A8 0 55%, #243247 0)}
+  .val{position:absolute;left:0;right:0;top:48px;text-align:center;font-size:24px;font-weight:700}
+  .panel.hum .val{color:#3DB8A8}
+  .panel.temp .val{color:#3DBF8C}
+  .unit{font-size:11px;color:#7E90A8;font-weight:500}
+  .rng{position:absolute;left:0;right:0;bottom:6px;text-align:center;color:#7E90A8;font-size:11px}
+  .bot{
+    margin:6px 8px 0;height:78px;background:#121C2A;border:1px solid #1E2C40;
+    border-radius:6px;display:flex;gap:8px;padding:8px;
+  }
+  .info{width:88px}
+  .ok{color:#E6B84D;font-size:14px;font-weight:700}
+  .bar{margin-top:8px;height:8px;background:#243247;border-radius:4px;overflow:hidden}
+  .bar>i{display:block;height:100%;width:62%;background:#E6B84D}
+  .meta{margin-top:10px;color:#7E90A8;font-size:11px}
+  .chart{flex:1;background:#0E1622;border-radius:4px;position:relative;overflow:hidden}
+  .chart svg{width:100%;height:100%}
+
+/* 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="hdr"><b>CLIMATE</b><span class="up">up 01:24</span>
+    <span class="sp"><span>OK</span><span class="led"></span></span></div>
+  <div class="row">
+    <div class="panel temp"><div class="cap">TEMP</div><div class="gauge"></div>
+      <div class="val">24.6<span class="unit">C</span></div><div class="rng">22.1 / 26.0</div></div>
+    <div class="panel hum"><div class="cap">HUM</div><div class="gauge"></div>
+      <div class="val">48<span class="unit">%</span></div><div class="rng">41 / 55</div></div>
+  </div>
+  <div class="bot">
+    <div class="info"><div class="ok">COMFORT</div><div class="bar"><i></i></div>
+      <div class="meta">DHT11 · GPIO22</div></div>
+    <div class="chart"><svg viewBox="0 0 180 60" preserveAspectRatio="none">
+      <polyline fill="none" stroke="#3DBF8C" stroke-width="2"
+        points="0,40 20,35 40,38 60,28 80,30 100,22 120,26 140,18 160,24 180,20"/>
+      <polyline fill="none" stroke="#3DB8A8" stroke-width="2"
+        points="0,45 20,42 40,44 60,40 80,38 100,36 120,39 140,34 160,37 180,35"/>
+    </svg></div>
+  </div>
+</div></div>
+
+
+</div>
+</body>
+</html>
--- a/firmware/cyd_35r/media/preview.html
+++ b/firmware/cyd_35r/media/preview.html
@@ -0,0 +1,66 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8" />
+<title>LIGHT</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:#0A1018;color:#F2F5FA;font:12px/1.2 system-ui,sans-serif;
+    overflow:hidden}
+  .hdr{display:flex;align-items:center;gap:8px;padding:4px 8px;height:24px}
+  .hdr b{font-size:14px}.up{color:#7E90A8}.sp{margin-left:auto;display:flex;gap:6px;align-items:center;color:#7E90A8}
+  .led{width:9px;height:9px;border-radius:50%;background:#4CAF7A}
+  .row{display:flex;gap:6px;padding:0 8px}
+  .panel{flex:1;height:118px;background:#121C2A;border:1px solid #1E2C40;border-radius:6px;padding:6px 8px;position:relative}
+  .cap{color:#7E90A8;font-size:11px}
+  .gauge{width:90px;height:90px;margin:4px auto 0;border-radius:50%;
+    background:conic-gradient(#F0C040 0 42%, #243247 0);
+    mask:radial-gradient(farthest-side,transparent 62%,#000 63%);
+    -webkit-mask:radial-gradient(farthest-side,transparent 62%,#000 63%)}
+  .panel.lvl .gauge{background:conic-gradient(#4DA3FF 0 58%, #243247 0)}
+  .val{position:absolute;left:0;right:0;top:44px;text-align:center;font-size:20px;font-weight:700;color:#F0C040}
+  .panel.lvl .val{color:#4DA3FF}
+  .unit{font-size:10px;color:#7E90A8}
+  .rng{position:absolute;left:0;right:0;bottom:6px;text-align:center;color:#7E90A8;font-size:11px}
+  .bot{margin:6px 8px 0;height:78px;background:#121C2A;border:1px solid #1E2C40;border-radius:6px;display:flex;gap:8px;padding:8px}
+  .info{width:96px}.ok{color:#4CAF7A;font-size:14px;font-weight:700}
+  .bar{margin-top:8px;height:8px;background:#243247;border-radius:4px;overflow:hidden}
+  .bar>i{display:block;height:100%;width:58%;background:#4DA3FF}
+  .meta{margin-top:8px;color:#7E90A8;font-size:11px}
+  .chart{flex:1;background:#0E1622;border-radius:4px}
+  .chart svg{width:100%;height:100%}
+
+/* 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="hdr"><b>LIGHT</b><span class="up">up 02:18</span>
+    <span class="sp"><span>OK</span><span class="led"></span></span></div>
+  <div class="row">
+    <div class="panel"><div class="cap">LUX</div><div class="gauge"></div>
+      <div class="val">186<span class="unit"> lx</span></div><div class="rng">42 / 420</div></div>
+    <div class="panel lvl"><div class="cap">LEVEL</div><div class="gauge"></div>
+      <div class="val">58<span class="unit"> %</span></div><div class="rng">EV 7.5</div></div>
+  </div>
+  <div class="bot">
+    <div class="info"><div class="ok">INDOOR</div><div class="bar"><i></i></div>
+      <div class="meta">GY30 BH1750<br/>SDA22 · SCL27</div></div>
+    <div class="chart"><svg viewBox="0 0 180 60" preserveAspectRatio="none">
+      <polyline fill="none" stroke="#F0C040" stroke-width="2"
+        points="0,40 20,38 40,32 60,30 80,28 100,34 120,26 140,24 160,22 180,25"/>
+      <polyline fill="none" stroke="#4DA3FF" stroke-width="2"
+        points="0,48 20,46 40,44 60,42 80,40 100,43 120,38 140,36 160,35 180,37"/>
+    </svg></div>
+  </div>
+</div></div>
+
+</div>
+</body>
+</html>
--- a/firmware/cyd_35r/meta.json
+++ b/firmware/cyd_35r/meta.json
@@ -0,0 +1,15 @@
+{
+    "boardId":  "esp32-3248s035",
+    "name":  "CYD GY30 light dashboard (3.5\")",
+    "summary":  "Lux \u0026 perceived-level gauges with scene bar and chart",
+    "description":  "GY30 / BH1750 on SDA=GPIO22 / SCL=GPIO21 (3.5C). Dual arcs for LUX / LEVEL%, scene label, EV, live sparkline. Tap cycles backlight; hold resets min/max.",
+    "tags":  [
+                 "light",
+                 "gy30",
+                 "bh1750",
+                 "lux"
+             ],
+    "media":  {
+                  "preview":  "media/preview.html"
+              }
+}
--- a/firmware/cyd_35r/partitions.bin
+++ b/firmware/cyd_35r/partitions.bin
--- a/firmware/export_from_build.ps1
+++ b/firmware/export_from_build.ps1
@@ -73,8 +73,8 @@ if (Test-Path $metaPath) {
  try {
    $meta = Get-Content $metaPath -Raw | ConvertFrom-Json
    $meta.boardId = $boardIdHint
-    if ($Env -eq "cyd_35r" -and $meta.name -notmatch "3\.5") {
-      $meta.name = ($meta.name -replace "\s*$","") + " (3.5\")"
+    if ($Env -eq "cyd_35r" -and $meta.name -notmatch '3\.5') {
+      $meta.name = ($meta.name -replace '\s*$','') + ' (3.5")'
    }
    $meta | ConvertTo-Json -Depth 8 | Set-Content -Encoding utf8 $metaPath
  } catch {
--- a/include/lv_conf.h
+++ b/include/lv_conf.h
@@ -5,7 +5,9 @@

 #define LV_COLOR_DEPTH 16

+#ifndef LV_MEM_SIZE
 #define LV_MEM_SIZE (48 * 1024U)
+#endif
 #define LV_DEF_REFR_PERIOD 16
 #define LV_DPI_DEF 130

--- a/include/touch.h
+++ b/include/touch.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#include <lvgl.h>
+
+void touch_init();
+void touch_read_cb(lv_indev_t *indev, lv_indev_data_t *data);
--- a/platformio.ini
+++ b/platformio.ini
@@ -1,6 +1,6 @@
-; CYD ESP32-2432S028R â€?LVGL GY30(BH1750) å…‰ç…§ä»ªè¡¨ç›?
-; GY30 SDA -> GPIO22, SCL -> GPIO27
-
+; CYD — LVGL GY30(BH1750) light dashboard
+; 2.8": GY30 SDA=GPIO22 SCL=GPIO27, TFT_BL=21
+; 3.5C: GY30 SDA=GPIO22 SCL=GPIO21, TFT_BL=27 (GT911 on Wire1 33/32)
 [platformio]
 default_envs = cyd_28r

@@ -46,12 +46,12 @@ build_flags =
  -D LV_CONF_INCLUDE_SIMPLE=1
  -I include

-; æ ‡å‡† CYD 2.8" ç”µé˜»å±?(ILI9341)
+; 标准 CYD 2.8" 电阻<EFBFBD>?(ILI9341)
 [env:cyd_28r]
 build_flags =
  ${env.build_flags}

-; é¢œè‰²å<EFBFBD><EFBFBD>ç›¸ç‰ˆæœ¬ï¼ˆè‹¥ç”»é<EFBFBD>¢è‰²å<EFBFBD><EFBFBD>/å<>‘ç™½å<C2BD>¯æ”¹ç”¨æ¤çŽ¯å¢ƒï¼?
+; 颜色反相版本（若画面色偏/发白可改用此环境<E78EAF>?
 [env:cyd_28r_inv]
 build_flags =
  ${env.build_flags}
@@ -66,18 +66,28 @@ build_flags =
  -D TFT_RGB_ORDER=TFT_BGR
  -D TFT_INVERSION_ON=1

-; Optional 3.5" CYD ESP32-3248S035 (ST7796 resistive). Default remains cyd_28r.
+; Optional 3.5" CYD ESP32-3248S035C (ST7796 + GT911 capacitive). Default remains cyd_28r.
 ; Build: pio run -e cyd_35r
+; Keep TOUCH_CS=-1 — GPIO33 is GT911 SDA, not resistive touch CS.
+; TFT_BL=GPIO27 (not 21 — 21 is GT911 INT / GY30 SCL). GT911 uses Wire1.
 [env:cyd_35r]
+lib_deps =
+  lvgl/lvgl@9.2.2
+  bodmer/TFT_eSPI@2.5.43
+  claws/BH1750@^1.3.0
 build_flags =
  ${env.build_flags}
-  -U ILI9341_2_DRIVER
-  -D ST7796_DRIVER=1
-  -U TFT_WIDTH
-  -U TFT_HEIGHT
-  -D TFT_WIDTH=320
-  -D TFT_HEIGHT=480
-  -U TFT_BL
-  -D TFT_BL=27
-  -D CYD_BOARD_3248S035=1
+  -UILI9341_2_DRIVER
+  -DST7796_DRIVER=1
+  -UTFT_WIDTH
+  -UTFT_HEIGHT
+  -DTFT_WIDTH=320
+  -DTFT_HEIGHT=480
+  -UTFT_BL
+  -DTFT_BL=27
+  -DCYD_BOARD_3248S035=1
+  -DSUPPORT_TRANSACTIONS
+  -DTFT_RGB_ORDER=TFT_BGR
+  -ULV_MEM_SIZE
+  -DLV_MEM_SIZE=32768

--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,30 +1,26 @@
 /**
- * CYD ESP32-2432S028R — LVGL GY30(BH1750) 光照仪表盘
- * GY30 SDA -> GPIO22, SCL -> GPIO27
+ * CYD — LVGL GY30(BH1750) 光照仪表盘
+ * 2.8": SDA=GPIO22 SCL=GPIO27, TFT_BL=GPIO21
+ * 3.5C: SDA=GPIO22 SCL=GPIO21, TFT_BL=GPIO27 (GT911 INT=21, polled; Wire1 for touch)
 */

 #include <Arduino.h>
 #include <Wire.h>
 #include <lvgl.h>
 #include <TFT_eSPI.h>
-#include <XPT2046_Touchscreen.h>
 #include <BH1750.h>
 #include <math.h>
+#include "touch.h"

 #define I2C_SDA 22
-#define I2C_SCL 27
 #if defined(CYD_BOARD_3248S035)
+#define I2C_SCL 21
 #define TFT_BL_PIN 27
 #else
+#define I2C_SCL 27
 #define TFT_BL_PIN 21
 #endif

-#define XPT2046_IRQ 36
-#define XPT2046_MOSI 32
-#define XPT2046_MISO 39
-#define XPT2046_CLK 25
-#define XPT2046_CS 33
-
 #if defined(CYD_BOARD_3248S035)
 #define SCREEN_WIDTH 480
 #define SCREEN_HEIGHT 320
@@ -37,7 +33,11 @@
 #define EMA_ALPHA 0.35f
 #define HISTORY_LEN 48
 #define LUX_ARC_MAX 1000
+#if defined(CYD_BOARD_3248S035)
+#define DRAW_BUF_SIZE (SCREEN_WIDTH * SCREEN_HEIGHT / 20 * (LV_COLOR_DEPTH / 8))
+#else
 #define DRAW_BUF_SIZE (SCREEN_WIDTH * SCREEN_HEIGHT / 10 * (LV_COLOR_DEPTH / 8))
+#endif

 /* Layout grid — every region has exclusive space, no overlaps */
 #if defined(CYD_BOARD_3248S035)
@@ -78,8 +78,6 @@ static const lv_color_t COL_BAD = lv_color_hex(0xE05A5A);
 static const lv_color_t COL_ARC_BG = lv_color_hex(0x243247);
 static const lv_color_t COL_CHART_BG = lv_color_hex(0x0E1622);

-SPIClass touchscreenSPI = SPIClass(VSPI);
-XPT2046_Touchscreen touchscreen(XPT2046_CS, XPT2046_IRQ);
 BH1750 lightMeter;

 static uint32_t draw_buf[DRAW_BUF_SIZE / 4];
@@ -190,32 +188,26 @@ static void reset_minmax(void) {
 }

 static void touchscreen_read(lv_indev_t *indev, lv_indev_data_t *data) {
-  LV_UNUSED(indev);
  static bool was_pressed = false;
  static uint32_t press_ms = 0;

-  if (touchscreen.tirqTouched() && touchscreen.touched()) {
-    TS_Point p = touchscreen.getPoint();
-    data->point.x = map(p.y, 240, 3800, 1, SCREEN_WIDTH);
-    data->point.y = map(p.x, 200, 3700, SCREEN_HEIGHT, 1);
-    data->state = LV_INDEV_STATE_PRESSED;
+  touch_read_cb(indev, data);
+
+  if (data->state == LV_INDEV_STATE_PRESSED) {
    if (!was_pressed) {
      was_pressed = true;
      press_ms = millis();
    }
-  } else {
-    data->state = LV_INDEV_STATE_RELEASED;
-    if (was_pressed) {
-      was_pressed = false;
-      uint32_t held = millis() - press_ms;
-      if (held >= 700) {
-        reset_minmax();
-      } else if (held < 400) {
-        set_backlight((bright_level + 1) & 0x03);
-        char buf[20];
-        lv_snprintf(buf, sizeof(buf), "brightness %u/3", (unsigned)bright_level);
-        show_hint(buf, 900);
-      }
+  } else if (was_pressed) {
+    was_pressed = false;
+    uint32_t held = millis() - press_ms;
+    if (held >= 700) {
+      reset_minmax();
+    } else if (held < 400) {
+      set_backlight((bright_level + 1) & 0x03);
+      char buf[20];
+      lv_snprintf(buf, sizeof(buf), "brightness %u/3", (unsigned)bright_level);
+      show_hint(buf, 900);
    }
  }
 }
@@ -572,26 +564,26 @@ void setup() {
  set_backlight(2);

  Serial.println("CYD LVGL GY30 Light Dashboard");
-  Serial.printf("LVGL %d.%d.%d  SDA=GPIO%d SCL=GPIO%d\n",
+  Serial.printf("LVGL %d.%d.%d  BL=GPIO%d  SDA=GPIO%d SCL=GPIO%d\n",
                lv_version_major(), lv_version_minor(), lv_version_patch(),
-                I2C_SDA, I2C_SCL);
+                TFT_BL_PIN, I2C_SDA, I2C_SCL);
+
+  /* 3.5: GT911 reset briefly drives INT(GPIO21); leave INT as INPUT, then take Wire for GY30. */
+  touch_init();

  Wire.begin(I2C_SDA, I2C_SCL);
  Wire.setClock(100000);

  if (!lightMeter.begin(BH1750::CONTINUOUS_HIGH_RES_MODE)) {
-    Serial.println("GY30/BH1750 not found — check wiring (SDA22/SCL27)");
+    Serial.printf("GY30/BH1750 not found — check wiring (SDA%d/SCL%d)\n",
+                  I2C_SDA, I2C_SCL);
  } else {
    Serial.println("GY30/BH1750 OK");
  }

  lv_init();

-  touchscreenSPI.begin(XPT2046_CLK, XPT2046_MISO, XPT2046_MOSI, XPT2046_CS);
-  touchscreen.begin(touchscreenSPI);
-  touchscreen.setRotation(2);
-
-  #if defined(CYD_BOARD_3248S035)
+#if defined(CYD_BOARD_3248S035)
  lv_display_t *disp = lv_tft_espi_create(320, 480, draw_buf, sizeof(draw_buf));
 #else
  lv_display_t *disp = lv_tft_espi_create(240, 320, draw_buf, sizeof(draw_buf));
@@ -601,6 +593,7 @@ void setup() {
  lv_indev_t *indev = lv_indev_create();
  lv_indev_set_type(indev, LV_INDEV_TYPE_POINTER);
  lv_indev_set_read_cb(indev, touchscreen_read);
+  lv_indev_set_display(indev, disp);

  create_ui();
  delay(200);
--- a/src/touch.cpp
+++ b/src/touch.cpp
@@ -0,0 +1,196 @@
+#include "touch.h"
+
+#include <Arduino.h>
+
+/**
+ * 2.8": XPT2046 resistive SoftSPI bus (CS33).
+ * 3.5C (3248S035C): GT911 capacitive on Wire1 SDA33/SCL32/INT21/RST25.
+ * Feed coords are always native panel 320x480 for LVGL ROTATION_270.
+ * Wire1 leaves Wire free for GY30 (SDA22 / SCL21). TFT_BL is GPIO27.
+ * After address select, INT returns to INPUT so GPIO21 can be GY30 SCL.
+ */
+
+static int16_t clampi(int32_t v, int32_t lo, int32_t hi) {
+  if (v < lo) return (int16_t)lo;
+  if (v > hi) return (int16_t)hi;
+  return (int16_t)v;
+}
+
+#if defined(CYD_BOARD_3248S035)
+
+#include <Wire.h>
+
+/* Native panel size — not UI landscape SCREEN_* (480x320). */
+static constexpr int16_t PANEL_W = 320;
+static constexpr int16_t PANEL_H = 480;
+
+#define CYD_GT911_SDA 33
+#define CYD_GT911_SCL 32
+#define CYD_GT911_INT 21
+#define CYD_GT911_RST 25
+
+/* Minimal GT911 — no config rewrite (TAMC setResolution can hang Wire). */
+static uint8_t s_gt_addr = 0x5D;
+static constexpr uint16_t GT_POINT_INFO = 0x814E;
+static constexpr uint16_t GT_POINT_1 = 0x814F;
+
+static bool gt_write8(uint16_t reg, uint8_t val) {
+  Wire1.beginTransmission(s_gt_addr);
+  Wire1.write((uint8_t)(reg >> 8));
+  Wire1.write((uint8_t)(reg & 0xFF));
+  Wire1.write(val);
+  return Wire1.endTransmission() == 0;
+}
+
+static bool gt_read(uint16_t reg, uint8_t *buf, uint8_t len) {
+  Wire1.beginTransmission(s_gt_addr);
+  Wire1.write((uint8_t)(reg >> 8));
+  Wire1.write((uint8_t)(reg & 0xFF));
+  if (Wire1.endTransmission(false) != 0) {
+    return false;
+  }
+  const uint8_t n = Wire1.requestFrom(s_gt_addr, len);
+  if (n != len) {
+    return false;
+  }
+  for (uint8_t i = 0; i < len; i++) {
+    buf[i] = Wire1.read();
+  }
+  return true;
+}
+
+static bool gt_probe(uint8_t addr) {
+  Wire1.beginTransmission(addr);
+  return Wire1.endTransmission() == 0;
+}
+
+/* TAMC-compatible address select: INT low => 0x5D, INT high => 0x14 */
+static void gt_hw_reset(bool addr_0x14) {
+  pinMode(CYD_GT911_INT, OUTPUT);
+  pinMode(CYD_GT911_RST, OUTPUT);
+  digitalWrite(CYD_GT911_INT, LOW);
+  digitalWrite(CYD_GT911_RST, LOW);
+  delay(10);
+  digitalWrite(CYD_GT911_INT, addr_0x14 ? HIGH : LOW);
+  delay(1);
+  digitalWrite(CYD_GT911_RST, HIGH);
+  delay(5);
+  digitalWrite(CYD_GT911_INT, LOW);
+  delay(50);
+  /* Backlight is GPIO27 — leave INT as input so GPIO21 can be GY30 SCL. */
+  pinMode(CYD_GT911_INT, INPUT);
+  delay(50);
+}
+
+static bool gt_find_addr() {
+  for (uint8_t a : {uint8_t(0x5D), uint8_t(0x14)}) {
+    if (gt_probe(a)) {
+      s_gt_addr = a;
+      return true;
+    }
+  }
+  return false;
+}
+
+void touch_init() {
+  Serial.println("Touch: GT911 I2C capacitive (3.5C) minimal Wire1");
+  Wire1.begin(CYD_GT911_SDA, CYD_GT911_SCL);
+  Wire1.setClock(100000);
+#if defined(WIRE_HAS_TIMEOUT) || defined(ESP32)
+  Wire1.setTimeOut(50);
+#endif
+
+  if (!gt_find_addr()) {
+    Serial.println("GT911 not found — hw reset 0x5D");
+    gt_hw_reset(false);
+    if (!gt_find_addr()) {
+      Serial.println("GT911 not found — hw reset 0x14");
+      gt_hw_reset(true);
+      gt_find_addr();
+    }
+  }
+
+  /* Ensure INT is free for GY30 SCL even if probe skipped hw reset. */
+  pinMode(CYD_GT911_INT, INPUT);
+
+  Serial.printf("GT911 probe 0x5D=%s 0x14=%s using=0x%02X\n",
+                gt_probe(0x5D) ? "OK" : "no", gt_probe(0x14) ? "OK" : "no",
+                s_gt_addr);
+  Serial.printf("GT911 SDA=%d SCL=%d INT=%d RST=%d\n", CYD_GT911_SDA,
+                CYD_GT911_SCL, CYD_GT911_INT, CYD_GT911_RST);
+}
+
+void touch_read_cb(lv_indev_t * /*indev*/, lv_indev_data_t *data) {
+  uint8_t info = 0;
+
+  if (!gt_read(GT_POINT_INFO, &info, 1)) {
+    data->state = LV_INDEV_STATE_RELEASED;
+    return;
+  }
+
+  const uint8_t touches = info & 0x0F;
+  const bool buffered = (info & 0x80) != 0;
+
+  if (!buffered || touches == 0) {
+    if (buffered) {
+      gt_write8(GT_POINT_INFO, 0);
+    }
+    data->state = LV_INDEV_STATE_RELEASED;
+    return;
+  }
+
+  uint8_t pt[7];
+  if (!gt_read(GT_POINT_1, pt, 7)) {
+    gt_write8(GT_POINT_INFO, 0);
+    data->state = LV_INDEV_STATE_RELEASED;
+    return;
+  }
+  gt_write8(GT_POINT_INFO, 0);
+
+  const int16_t raw_x = (int16_t)(pt[1] | (pt[2] << 8));
+  const int16_t raw_y = (int16_t)(pt[3] | (pt[4] << 8));
+
+  /* Native 320x480 → LVGL 270. */
+  const int16_t nx = clampi(raw_x, 0, PANEL_W - 1);
+  const int16_t ny = clampi(raw_y, 0, PANEL_H - 1);
+  data->point.x = (int16_t)((PANEL_W - 1) - nx);
+  data->point.y = (int16_t)((PANEL_H - 1) - ny);
+  data->state = LV_INDEV_STATE_PRESSED;
+}
+
+#else
+
+#include <SPI.h>
+#include <XPT2046_Touchscreen.h>
+
+#define XPT2046_IRQ 36
+#define XPT2046_MOSI 32
+#define XPT2046_MISO 39
+#define XPT2046_CLK 25
+#define XPT2046_CS 33
+
+static constexpr int16_t UI_W = 320;
+static constexpr int16_t UI_H = 240;
+
+static SPIClass touchscreenSPI = SPIClass(VSPI);
+static XPT2046_Touchscreen touchscreen(XPT2046_CS, XPT2046_IRQ);
+
+void touch_init() {
+  touchscreenSPI.begin(XPT2046_CLK, XPT2046_MISO, XPT2046_MOSI, XPT2046_CS);
+  touchscreen.begin(touchscreenSPI);
+  touchscreen.setRotation(2);
+  Serial.println("Touch: XPT2046 resistive (2.8)");
+}
+
+void touch_read_cb(lv_indev_t * /*indev*/, lv_indev_data_t *data) {
+  if (touchscreen.tirqTouched() && touchscreen.touched()) {
+    TS_Point p = touchscreen.getPoint();
+    data->point.x = map(p.y, 240, 3800, 1, UI_W);
+    data->point.y = map(p.x, 200, 3700, UI_H, 1);
+    data->state = LV_INDEV_STATE_PRESSED;
+  } else {
+    data->state = LV_INDEV_STATE_RELEASED;
+  }
+}
+
+#endif