From 06fb009773416a7fbd5f996091ce54c5ac58a36e Mon Sep 17 00:00:00 2001
From: wangfq <wangfq@collectpublish.net>
Date: Wed, 12 Aug 2026 19:15:37 +0800
Subject: [PATCH] =?UTF-8?q?test(vd960DBN):=20UART2=20=E9=9A=94=E7=A6=BB?=
 =?UTF-8?q?=E5=AE=9E=E9=AA=8C=20=E2=80=94=20=E8=BD=AF=E4=BB=B6=E7=A6=81?=
 =?UTF-8?q?=E7=94=A8=20Loop=20=E5=8F=A3=E5=AE=9A=E4=BD=8D=E5=A4=8D?=
 =?UTF-8?q?=E4=BD=8D=E6=BA=90?=
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现场: RST_REASON 全 0 瞬态复位, 总在 Loop 帧后 ~10ms, 指向 Loop 侧干扰
实验: uart_init 后立即禁用 USART2 + PA3 脱离 UART 功能(上拉输入)
     = 等效软件断开 Loop; 同时快照无帧入队, 同步验证 SPI 活动非诱因
判定: 不复位+无乱码 → Loop 数据路径干扰实锤
      还复位 → 物理引脚级干扰 或 CH32 自身电源问题
通过后删除此块
---
 .../APP/peripheral_main.c                       | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/peripheral_main.c b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/peripheral_main.c
index ceecfa1..1d8858c 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/peripheral_main.c
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/peripheral_main.c
@@ -331,6 +331,23 @@ int main(void)
     HAL_Init();
 
     uart_init();
+
+    /* ===== 实验: 禁用 UART2 (Loop 口) 隔离测试 (2026-08-12) =====
+       目的: 验证 Loop MCU 数据/干扰是否导致复位循环 (RST_REASON 全 0 瞬态复位)
+       做法: USART2 关断 + PA3 脱离 UART 功能(上拉输入) — 等效软件断开 Loop
+       通过后删除此块; 另: 禁用后快照无帧入队, 同步验证快照 SPI 活动非诱因 */
+    {
+        GPIO_InitTypeDef gpio;
+        USART_ITConfig(USART2, USART_IT_RXNE, DISABLE);
+        USART_Cmd(USART2, DISABLE);
+        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
+        gpio.GPIO_Pin  = GPIO_Pin_3;
+        gpio.GPIO_Mode = GPIO_Mode_IPU;     /* PA3 脱离 UART2, 上拉输入 */
+        gpio.GPIO_Speed = GPIO_Speed_50MHz;
+        GPIO_Init(GPIOA, &gpio);
+        PRINT("ISOLATE: UART2 disabled (Loop isolation test)\n");
+    }
+
     TIM3_Init();
     TIM2_Init();