Fix 3.5C pins per CYD_PROJECT_GUIDE: BL=27, LD2420 TX=GPIO4, GT911 INT as INPUT.

Black-screen cause was TFT_BL=21; archive flashable firmware/cyd_35r. Co-authored-by: Cursor <cursoragent@cursor.com>
2026-10-25 11:04:59 +08:00
parent 569149030a
commit 786f48ebd6
16 changed files with 476 additions and 87 deletions
--- a/README.md
+++ b/README.md
@@ -1,24 +1,33 @@
 # CYD LD2420 雷达仪表盘

-ESP32 Cheap Yellow Display（ESP32-2432S028R）+ HLK-LD2420 24GHz 毫米波雷达 + LVGL 仪表盘。
+ESP32 Cheap Yellow Display + HLK-LD2420 24GHz 毫米波雷达 + LVGL 仪表盘。  
+默认 **2.8" ESP32-2432S028R**；可选 **3.5" ESP32-3248S035C**（`cyd_35r`）。板型差异见 [`../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 | HLK-LD2420 |
-| OT1 | **GPIO22**（模块串口 TX → ESP RX，固件 ≥ v1.5.3） |
-| RX | **GPIO27**（模块串口 RX → ESP TX） |
-| 供电 | 3.3V / GND（与 CYD 共地） |
+| 项目 | 2.8"（默认） | 3.5" C（`cyd_35r`） |
+|------|--------------|---------------------|
+| 板子 | ESP32-2432S028R（ILI9341 + XPT2046） | ESP32-3248S035C（ST7796 + GT911） |
+| 横屏 UI | 320×240 | 480×320 |
+| 背光 | GPIO21 | **GPIO27** |
+| LD2420 OT1 | **GPIO22**（→ ESP RX） | **GPIO22**（同左） |
+| LD2420 RX | **GPIO27**（← ESP TX） | **GPIO4**（← ESP TX；27 是背光） |
+| 供电 | 3.3V / GND（共地） | 同左 |

 接线（固件 ≥ v1.5.3）：

 ```
+# 2.8"
 LD2420 3V3 → CYD 3.3V
 LD2420 GND → CYD GND
 LD2420 OT1 → GPIO22
 LD2420 RX  → GPIO27
+
+# 3.5C（勿接 27/21：背光 / GT911 INT）
+LD2420 3V3 → CYD 3.3V
+LD2420 GND → CYD GND
+LD2420 OT1 → GPIO22
+LD2420 RX  → GPIO4
 ```

 > 旧固件（&lt; v1.5.3）串口 TX 在 OT2，且默认波特率多为 **256000**。本工程会依次探测 115200 / 256000。
@@ -36,21 +45,30 @@ LD2420 RX  → GPIO27
 依赖 [PlatformIO](https://platformio.org/)。

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

 ### 预编译固件（随时刷，不必编译）

-已归档到 [`firmware/cyd_28r/`](firmware/cyd_28r/)（含 bootloader / partitions / app）：
+| 目录 | 板型 |
+|------|------|
+| [`firmware/cyd_28r/`](firmware/cyd_28r/) | 2.8" ILI9341 |
+| [`firmware/cyd_35r/`](firmware/cyd_35r/) | 3.5C ST7796 + GT911 |

 ```powershell
-cd firmware\cyd_28r
+cd firmware\cyd_28r   # 或 cyd_35r
 .\flash.ps1
 # 或 .\flash.ps1 -Port COM3
 ```

-说明见 [`firmware/README.md`](firmware/README.md)。源码更新后重新打包：`.\firmware\export_from_build.ps1`。
+说明见 [`firmware/README.md`](firmware/README.md)。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
+```

 ### 环境选择

@@ -59,6 +77,7 @@ cd firmware\cyd_28r
 | `cyd_28r` | 标准 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" 3248S035C（ST7796 + GT911，BL=27） |

 ## 项目结构

@@ -86,6 +105,7 @@ README.md                      # 本文档

 | 日期 | 说明 |
 |------|------|
+| 2026-10-25 | 按 `CYD_PROJECT_GUIDE.md` 修正 3.5：BL=27、LD2420 TX→GPIO4、GT911 INT 复位后 INPUT；归档 `firmware/cyd_35r/` |
 | 2026-10-18 | 初版：CYD + LD2420 LVGL 仪表盘；OT1→GPIO22、RX→GPIO27；显示固件版本 |
 | 2026-10-18 | 存在逻辑改为 ESPHome 出厂门限 + 10s 离开保持（动/静均保持 ON） |
 | 2026-10-18 | 归档预编译固件到 `firmware/cyd_28r/`，附一键刷写；初始化本地 Git |
@@ -94,7 +114,7 @@ README.md                      # 本文档

 ```
 CYD LVGL LD2420 Radar Dashboard
-LD2420 probe @ 115200 baud RX=22 TX=27
+LD2420 probe @ 115200 baud RX=22 TX=27   # 3.5 为 TX=4
  FW=v1.6.1  mode=simple
  set gates 1..12 to=10s (OK)
 ```
--- a/firmware/README.md
+++ b/firmware/README.md
@@ -1,17 +1,19 @@
 # 预编译固件（可随时刷写）

-当前归档目录：[`cyd_28r/`](cyd_28r/)
+| 目录 | 板子 | 接线 |
+|------|------|------|
+| [`cyd_28r/`](cyd_28r/) | ESP32-2432S028R（ILI9341） | OT1→22，RX→27 |
+| [`cyd_35r/`](cyd_35r/) | ESP32-3248S035C（ST7796 + GT911） | OT1→22，RX→4；BL=27 |

-对应板子：**CYD ESP32-2432S028R**（ILI9341），LD2420 OT1→GPIO22、RX→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）

 1. USB 连接板子  
-2. 在本目录执行：
+2. 进入对应目录执行：

 ```powershell
-cd firmware\cyd_28r
+cd firmware\cyd_28r   # 或 cyd_35r
 .\flash.ps1
 # 或指定端口
 .\flash.ps1 -Port COM3
@@ -40,7 +42,9 @@ esptool.py --chip esp32 --port COM3 --baud 921600 write_flash -z ^
 在仓库根目录：

 ```powershell
-.\firmware\export_from_build.ps1
+.\firmware\export_from_build.ps1              # 2.8 → cyd_28r
+.\firmware\export_from_build.ps1 -Env cyd_35r # 3.5 → cyd_35r
 # 仅复制、不编译：
 .\firmware\export_from_build.ps1 -SkipBuild
+.\firmware\export_from_build.ps1 -Env cyd_35r -SkipBuild
 ```
--- a/firmware/cyd_35r/VERSION.txt
+++ b/firmware/cyd_35r/VERSION.txt
@@ -0,0 +1,15 @@
+name: CYD ld2420test (cyd_35r)
+git: 5691490
+date: 2026-10-25
+board: ESP32-3248S035 (ST7796 + GT911)
+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    AD799C4C450A00B9037F9F071D45B322DCB36797836580343794B4E56CC2484D
+  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 +1,84 @@
+# Flash archived CYD LD2420 radar 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/preview.html
+++ b/firmware/cyd_35r/media/preview.html
@@ -0,0 +1,63 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8" />
+<title>RADAR</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}.up,.st{color:#7E90A8}.sp{margin-left:auto;display:flex;gap:6px;align-items:center}
+  .led{width:9px;height:9px;border-radius:50%;background:#3DBF8C}
+  .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(#4DA3FF 0 45%, #243247 0);
+    mask:radial-gradient(farthest-side,transparent 62%,#000 63%);
+    -webkit-mask:radial-gradient(farthest-side,transparent 62%,#000 63%)}
+  .panel.pres .gauge{background:conic-gradient(#3DBF8C 0 100%, #243247 0)}
+  .val{position:absolute;left:0;right:0;top:48px;text-align:center;font-size:22px;font-weight:700;color:#4DA3FF}
+  .panel.pres .val{color:#3DBF8C;font-size:18px;top:52px}
+  .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:#3DBF8C;font-size:14px;font-weight:700}
+  .meta{margin-top:10px;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>RADAR</b><span class="up">up 00:42</span>
+    <span class="sp"><span class="st">DETECT</span><span class="led"></span></span></div>
+  <div class="row">
+    <div class="panel"><div class="cap">DIST</div><div class="gauge"></div>
+      <div class="val">186<span style="font-size:11px;color:#7E90A8">cm</span></div>
+      <div class="rng">LD2420</div></div>
+    <div class="panel pres"><div class="cap">PRESENCE</div><div class="gauge"></div>
+      <div class="val">YES</div><div class="rng">OT1 / RX</div></div>
+  </div>
+  <div class="bot">
+    <div class="info"><div class="ok">TARGET</div>
+      <div class="meta">GPIO22 · GPIO27<br/>motion gate ON</div></div>
+    <div class="chart"><svg viewBox="0 0 180 60" preserveAspectRatio="none">
+      <polyline fill="none" stroke="#4DA3FF" stroke-width="2"
+        points="0,50 20,48 40,30 60,28 80,22 100,35 120,40 140,25 160,20 180,18"/>
+    </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 LD2420 radar dashboard (3.5\")",
+  "summary": "Presence & distance from LD2420 mmWave radar",
+  "description": "OT1→GPIO22, RX→GPIO4. TFT_BL=27, GT911 capacitive. Distance gauge, presence LED, motion chart.",
+  "tags": [
+    "radar",
+    "ld2420",
+    "presence",
+    "cyd35"
+  ],
+  "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
@@ -23,7 +23,7 @@ if (-not $SkipBuild) {
 $src = Join-Path $root (".pio\build\" + $Env)
 if ($Env -eq "cyd_35r") {
  $dstName = "cyd_35r"
-  $boardLine = "board: ESP32-3248S035 (ST7796)"
+  $boardLine = "board: ESP32-3248S035 (ST7796 + GT911)"
  $boardIdHint = "esp32-3248s035"
 } else {
  $dstName = "cyd_28r"
@@ -67,21 +67,5 @@ foreach ($h in $hashes) {
 }
 $lines | Set-Content -Encoding utf8 (Join-Path $dst "VERSION.txt")

-# Keep / refresh meta.json boardId for catalog filtering
-$metaPath = Join-Path $dst "meta.json"
-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\")"
-    }
-    $meta | ConvertTo-Json -Depth 8 | Set-Content -Encoding utf8 $metaPath
-  } catch {
-    Write-Host "meta.json update skipped: $_"
-  }
-} elseif ($Env -eq "cyd_35r") {
-  Write-Host "Note: add firmware/cyd_35r/meta.json with boardId=$boardIdHint for the web catalog"
-}

 Write-Host "Exported -> $dst (env=$Env git=$git)"
--- 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 <EFBFBD><EFBFBD>?LVGL LD2420 毫米波雷达仪表盘
-; LD2420 OT1 -> GPIO22 (ESP RX), LD2420 RX -> GPIO27 (ESP TX)
-
+; CYD ESP32-2432S028R — LVGL LD2420 mmWave radar dashboard
+; LD2420 OT1 -> GPIO22 (ESP RX); module RX -> GPIO27 (2.8 ESP TX) / GPIO4 (3.5 ESP TX)
+; See ../CYD_PROJECT_GUIDE.md — 3.5 BL=27, GT911 INT=21 (not BL).
 [platformio]
 default_envs = cyd_28r

@@ -45,12 +45,12 @@ build_flags =
  -D LV_CONF_INCLUDE_SIMPLE=1
  -I include

-; 标准 CYD 2.8" 电阻<E794B5><EFBFBD>?(ILI9341)
+; 标准 CYD 2.8" 电阻<E794B5>?(ILI9341)
 [env:cyd_28r]
 build_flags =
  ${env.build_flags}

-; 颜色反相版本（若画面色偏/发白可改用此环境<E78EAF><EFBFBD>?
+; 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}
@@ -65,18 +65,27 @@ 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). LD2420 ESP TX -> GPIO4 (27=BL).
 [env:cyd_35r]
+lib_deps =
+  lvgl/lvgl@9.2.2
+  bodmer/TFT_eSPI@2.5.43
 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
@@ -1,34 +1,30 @@
 /**
- * CYD ESP32-2432S028R — LVGL LD2420 毫米波雷达仪表盘
+ * CYD + LD2420 毫米波雷达仪表盘（2.8 默认 / 3.5C 可选）
 *
 * 接线 (固件 ≥ v1.5.3):
- *   LD2420 OT1 -> GPIO22  (模块串口 TX → ESP RX)
- *   LD2420 RX  -> GPIO27  (模块串口 RX → ESP TX)
+ *   LD2420 OT1 -> GPIO22  (模块串口 TX → ESP RX)  两板相同
+ *   LD2420 RX  -> GPIO27  (2.8 ESP TX) / GPIO4 (3.5 ESP TX；27=背光)
+ * 3.5C (3248S035C): TFT_BL=27，GT911 INT=21 — 勿把 21/27 当传感器脚。
 *   VCC 3.3V / GND
 */

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

 /* ---- pins ---- */
 #define LD2420_RX_PIN 22 /* ESP RX  <- OT1 */
-#define LD2420_TX_PIN 27 /* ESP TX  -> RX  */
 #if defined(CYD_BOARD_3248S035)
+#define LD2420_TX_PIN 4  /* ESP TX  -> RX；3.5 上 27=BL、21=GT911 INT */
 #define TFT_BL_PIN 27
 #else
+#define LD2420_TX_PIN 27 /* ESP TX  -> RX  */
 #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
@@ -41,7 +37,11 @@
 #define SENSOR_STALE_MS 5000
 #define HISTORY_LEN 48
 #define DIST_ARC_MAX 800 /* cm (~11 gates * 70cm) */
+#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 — exclusive regions, no overlaps */
 #if defined(CYD_BOARD_3248S035)
@@ -113,8 +113,6 @@ 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);
 HardwareSerial RadarSerial(2);

 static uint32_t draw_buf[DRAW_BUF_SIZE / 4];
@@ -181,32 +179,26 @@ 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);
    }
  }
 }
@@ -893,11 +885,9 @@ void setup() {

  lv_init();

-  touchscreenSPI.begin(XPT2046_CLK, XPT2046_MISO, XPT2046_MOSI, XPT2046_CS);
-  touchscreen.begin(touchscreenSPI);
-  touchscreen.setRotation(2);
+  touch_init();

-  #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));
@@ -907,6 +897,7 @@ 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();

--- a/src/touch.cpp
+++ b/src/touch.cpp
@@ -0,0 +1,193 @@
+#include "touch.h"
+
+#include <Arduino.h>
+
+/**
+ * 2.8": XPT2046 resistive SoftSPI bus (CS33).
+ * 3.5C (3248S035C): GT911 capacitive on I2C Wire SDA33/SCL32/INT21/RST25.
+ * Backlight is GPIO27 — INT(21) is NOT the backlight. After address select,
+ * leave INT as INPUT (poll-only; some boards have broken INT wiring).
+ * Feed coords are always native panel 320x480 for LVGL ROTATION_270.
+ */
+
+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) {
+  Wire.beginTransmission(s_gt_addr);
+  Wire.write((uint8_t)(reg >> 8));
+  Wire.write((uint8_t)(reg & 0xFF));
+  Wire.write(val);
+  return Wire.endTransmission() == 0;
+}
+
+static bool gt_read(uint16_t reg, uint8_t *buf, uint8_t len) {
+  Wire.beginTransmission(s_gt_addr);
+  Wire.write((uint8_t)(reg >> 8));
+  Wire.write((uint8_t)(reg & 0xFF));
+  if (Wire.endTransmission(false) != 0) {
+    return false;
+  }
+  const uint8_t n = Wire.requestFrom(s_gt_addr, len);
+  if (n != len) {
+    return false;
+  }
+  for (uint8_t i = 0; i < len; i++) {
+    buf[i] = Wire.read();
+  }
+  return true;
+}
+
+static bool gt_probe(uint8_t addr) {
+  Wire.beginTransmission(addr);
+  return Wire.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 for polling / optional IRQ. */
+  pinMode(CYD_GT911_INT, INPUT);
+}
+
+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");
+  Wire.begin(CYD_GT911_SDA, CYD_GT911_SCL);
+  Wire.setClock(100000);
+#if defined(WIRE_HAS_TIMEOUT) || defined(ESP32)
+  Wire.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();
+    }
+  }
+
+  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. UI ≈ (H-1-raw_y, raw_x). */
+  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
+
+/* 2.8 UI landscape feed (unchanged from prior main.cpp). */
+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