FreeRTOS分配错误

Question

我在STM32F107VC上使用FreeRTOS V6.1.1并且经常出现malloc错误.堆区域在链接器脚本中定义,但在几次分配后它仍然卡在pvPortMalloc()的这个循环中:

while( ( pxBlock->xBlockSize < xWantedSize ) && ( pxBlock->pxNextFreeBlock != NULL ) )
{
    pxPreviousBlock = pxBlock;
    pxBlock = pxBlock->pxNextFreeBlock;
}

pxBlock: 0x20002300
pxPreviousBlock: 0x20002300
pxNewBlockLink: 0x00
xHeapHasBeenInitialised: 0x01

链接器脚本:

/* Entry Point */
ENTRY(Reset_Handler)

/* Highest address of the user mode stack */
_estack = 0x20010000;    /* end of 64K RAM */

/* Generate a link error if heap and stack don't fit into RAM */
_Min_Heap_Size = 0;      /* required amount of heap  */
_Min_Stack_Size = 0x200; /* required amount of stack */

/* Specify the memory areas */
MEMORY
{
  FLASH (rx)      : ORIGIN = 0x08000000, LENGTH = 256K
  RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 64K
  MEMORY_B1 (rx)  : ORIGIN = 0x60000000, LENGTH = 0K
}

...

怎么会这样？

Answer 1

这可能是由 heap_2.c 中的碎片引起的。尽管分配很小，但行为是一致的。使用 heap_4.c 解决了它。