embedded protocol_error ai_generated true

USB: HCD timeout waiting for transfer completion on pipe 3

ID: embedded/usb-host-hcd-timeout

Also available as: JSON · Markdown · 中文
77%Fix Rate
84%Confidence
1Evidence
2024-04-22First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
STM32Cube_FW_H7_V1.11.0 active — — —
USB_Host_Lib 2.2.0 active — — —
IAR EWARM 9.50.1 active — — —
ARM GCC 12.2.1 active — — —

Root Cause

USB host controller driver (HCD) timeout due to device not responding, incorrect endpoint configuration, or electrical noise on D+/D- lines.

generic

中文

USB主机控制器驱动超时，原因是设备无响应、端点配置错误或D+/D-线路上的电气噪声。

Official Documentation

https://www.st.com/resource/en/application_note/dm00250344-usb-host-and-device-library-on-stm32-mcus-stmicroelectronics.pdf

Workarounds

  1. 80% success Increase USB host channel timeout value in HAL_HCD_Init(): hhcd.Init.TransferTimeout = 5000; (from default 1000 ms) and regenerate code. 
    Increase USB host channel timeout value in HAL_HCD_Init(): hhcd.Init.TransferTimeout = 5000; (from default 1000 ms) and regenerate code.
  2. 85% success Add USB line debouncing in hardware: place 15 kΩ pull-down resistors on D+ and D- lines, and ensure VBUS is stable with a 10 µF capacitor. 
    Add USB line debouncing in hardware: place 15 kΩ pull-down resistors on D+ and D- lines, and ensure VBUS is stable with a 10 µF capacitor.
  3. 75% success Reinitialize the USB host port after timeout: call HAL_HCD_Stop(&hhcd); HAL_HCD_Start(&hhcd); then retry the transfer up to 3 times. 
    Reinitialize the USB host port after timeout: call HAL_HCD_Stop(&hhcd); HAL_HCD_Start(&hhcd); then retry the transfer up to 3 times.

中文步骤

  1. Increase USB host channel timeout value in HAL_HCD_Init(): hhcd.Init.TransferTimeout = 5000; (from default 1000 ms) and regenerate code.
  2. Add USB line debouncing in hardware: place 15 kΩ pull-down resistors on D+ and D- lines, and ensure VBUS is stable with a 10 µF capacitor.
  3. Reinitialize the USB host port after timeout: call HAL_HCD_Stop(&hhcd); HAL_HCD_Start(&hhcd); then retry the transfer up to 3 times.

Dead Ends

Common approaches that don't work:

  1. Increasing USB host polling interval in HAL_HCD_IRQHandler() 85% fail

    Longer polling intervals may cause missed transfers and do not solve underlying timeout.

  2. Re-enumerating the device by disconnecting and reconnecting in software 90% fail

    Does not fix root cause; device may fail again due to same config error.

  3. Adding a 100 ms delay before each USB transfer 80% fail

    Degrades throughput and may violate USB timing specifications.