From c91eee77f1ea2591b53f0b1b67c36bd30af9d023 Mon Sep 17 00:00:00 2001
From: nitiantuhao <2062405236@qq.com>
Date: Fri, 13 Mar 2026 22:25:12 +0800
Subject: [PATCH] 1.0

---
 Core/Src/main.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/Core/Src/main.c b/Core/Src/main.c
index 3f6fdf1..83c2d8a 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -69,10 +69,20 @@ void SystemClock_Config(void);
 extern USBD_HandleTypeDef hUsbDeviceFS; // 引入 USB 状态句柄
 
 int _write(int file, char *ptr, int len) {
-  for (int i = 0; i < len; i++) {
-    HAL_UART_Transmit(&huart4, (uint8_t*)&ptr[i], 1, 1000);
-    HAL_Delay(1);  // 每个字符间隔 1ms
+  // 1. 致命拦截：如果电脑压根没连上 USB，直接丢弃数据，坚决不死等！
+  if (hUsbDeviceFS.dev_state != USBD_STATE_CONFIGURED) {
+    return len;
   }
+
+  uint8_t result = CDC_Transmit_FS((uint8_t*)ptr, len);
+  uint32_t timeout = 0;
+
+  // 2. 极短超时：就算 USB 连着但突然卡了，最多循环 5000 次就强行放弃，保命要紧
+  while(result == USBD_BUSY && timeout < 5000) {
+    timeout++;
+    result = CDC_Transmit_FS((uint8_t*)ptr, len);
+  }
+
   return len;
 }
 /* USER CODE END 0 */