embedded runtime_error ai_generated true

SysTick：中断在翻转周期内未得到服务，时间基准损坏

SysTick: interrupt not serviced within rollover period, time base corrupted

ID: embedded/arm-systick-rollover-missed

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85%修复率
88%置信度
1证据数
2024-03-12首次发现

版本兼容性

版本状态引入弃用备注
FreeRTOS v10.6.0 active — — —
ARM Cortex-M4 r0p1 active — — —
STM32CubeH7 v1.11.0 active — — —

根因分析

SysTick中断被更高优先级的中断服务程序屏蔽或延迟，导致24位计数器未执行处理程序就翻转，损坏了RTOS滴答计数。

English

SysTick interrupt was masked or delayed by higher-priority ISR, causing the 24-bit counter to wrap without handler execution, corrupting RTOS tick count.

generic

官方文档

https://developer.arm.com/documentation/dui0552/a/cortex-m3-peripherals/system-timer--systick

解决方案

  1. Ensure SysTick interrupt priority is lower than time-critical ISRs but never masked for longer than 1 SysTick period. In FreeRTOS, set configMAX_SYSCALL_INTERRUPT_PRIORITY to include SysTick and check that no ISR runs for > 1 ms (assuming 1 kHz tick).
  2. Add a guard to detect missed tick and manually increment RTOS tick count. Implement a high-priority timer that checks if SysTick counter wrapped without ISR.
  3. Reduce interrupt latency by splitting long ISRs into deferred tasks (e.g., using FreeRTOS task notifications or semaphores).

无效尝试

常见但无效的做法:

  1. Increase SysTick interrupt priority to 0 (highest) 60% 失败

    Setting SysTick to highest priority may break critical timing in other interrupts and does not address the root cause of long ISR masking.

  2. Disable all other interrupts to ensure SysTick runs 70% 失败

    Disabling interrupts globally defeats the purpose of RTOS and can cause watchdog resets or data loss.

  3. Increase SysTick reload value to extend rollover period 90% 失败

    SysTick reload is fixed at 24 bits (max 16,777,215 cycles); increasing it is impossible without changing clock source.