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xTaskCreate内存不足分析
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xTaskCreate内存不足分析
使用xTaskCreate创建一个任务,提示errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY,明明configTOTAL_HEAP_SIZE有3000那么多,为什么创建一个2560字节的Heap都会失败呢,那么就分析一下.
首先,我们传进去的其实是usStackDepth,实际还需要和StackType_t相乘,StackType_t取决于平台,像ARM平台默认是uint32_t,也就是传进去2560,实际是10240,还要包含8个字节的xHeapStructSize,即期望10248.
而3000的HEAP_SIZE初始化后也要占用一个 xHeapStruct,所以是2992字节.为了满足他分配,那么需要多大呢?
那当然是最小 8+(usStackDepth*StackType_t +8)+….
所以不能混淆这里分配的大小啊.
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