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      <title>FreeRTOS 静态内存：对象活多久，RAM 算一次</title>
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      <description>以 STM32F407xx 和固定 CubeF4 所带 FreeRTOS V10.3.1 为边界，给出纯静态双任务、idle 内存回调和 HSI 启动参考实现；从对象生命周期、栈元素字节换算，走到 SRAM/CCM 分区账本与任务栈、MSP 运行余量的独立核验。未进行目标编译或上板验证。</description>
      
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