CDC_OVF_ERR embedded resource_error ai_generated true

USB CDC: ACM数据缓冲区溢出，端点0x81上丢弃64字节

USB CDC: ACM data buffer overflow, 64 bytes discarded on endpoint 0x81

ID: embedded/usb-cdc-acm-buffer-overflow

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82%修复率
88%置信度
1证据数
2023-11-20首次发现

版本兼容性

版本状态引入弃用备注
STM32Cube_FW_F4 v1.27.0 active — — —
TinyUSB v0.15.0 active — — —
USB CDC Class v1.2.0 active — — —

根因分析

USB CDC接收缓冲区已满，因为应用程序未能足够快地从虚拟COM端口读取数据，导致溢出。

English

The USB CDC receive buffer is full because the application does not read data fast enough from the virtual COM port, causing overflow.

generic

官方文档

https://www.st.com/resource/en/application_note/an4879-usb-hardware-and-pcb-guidelines-using-stm32-mcus-stmicroelectronics.pdf

解决方案

  1. Implement a circular buffer in the application to store incoming USB data and process it in a lower-priority task, ensuring the CDC receive interrupt never blocks.
  2. Increase the polling rate of the CDC receive function in the main loop, e.g., call CDC_Receive_FS() every 1ms instead of 10ms.

无效尝试

常见但无效的做法:

  1. Increase the USB buffer size in the CDC configuration 85% 失败

    Larger buffers only delay the overflow but do not fix the root cause of slow data consumption; eventually overflow still occurs.

  2. Reduce the baud rate of the virtual COM port to slow transmission 95% 失败

    Baud rate is irrelevant for USB CDC; data is packet-based and the host can still send at full speed.