rt_free()处理片外的SRAM时会崩溃

发布于 2021-04-12 22:23:06 浏览：1455 订阅该版

rt_malloc（）申请的如果是片内，free就OK。
rt_malloc（）申请的如果是SRAM，free就崩溃。
debug信息：
((header_ptr->next->magic & RT_MEMHEAP_MASK) == RT_MEMHEAP_MAGIC) assertion failed at function:rt_memheap_free, line number:532

没有精力跟踪，所以先报告一下。

细节1，内存测试通过，说明运行没毛病：

![7b09d7cb4ff9f75a0ca3413ad7d0a527.png](https://oss-club.rt-thread.org/uploads/20210413/7b09d7cb4ff9f75a0ca3413ad7d0a527.png)

细节2: 出问题的代码：
int tst5(void)
{
    rt_uint16_t* wt = (rt_uint16_t*)rt_malloc(2048);
    rt_uint16_t* rd = (rt_uint16_t*)rt_malloc(2048);
    rt_kprintf("rt_malloc(2048) wr=0x%x rd=0x%x\r\n",wt,rd);

rt_uint16_t* testsram = (rt_uint16_t*)rt_malloc(500000);
    if(testsram==0){
        rt_kprintf("rt_malloc(500k) failed\r\n");
        return -1;
    }else
        rt_kprintf("rt_malloc(500k) p=0x%x size=%d\r\n",testsram,sizeof(testsram));

rt_uint16_t ts=0;
    rt_uint16_t count=240;
    for(int i=0;i<1024;i++)
        wt[i]=i+1024;
    size_t st=2048;
    for(ts=0;ts<count;ts++){
       FMC_SRAM_WriteBuffer16(wt,testsram+ts*st,1024);
    }
    rt_kprintf("write ok\r\n");

long i=0;
    for(ts=0;ts<count;ts++)
    {
        FMC_SRAM_ReadBuffer16(rd,testsram+ts*st,1024);
        for(int j=0;j<1024;j++){
            if(wt[j]==rd[j])
                i++;
            else {
                i--;
            }
        }
    }
    rt_kprintf("result =%d\r\n",i);

rt_free(wt);
    rt_free(rd);
    //rt_free(testsram); bug !!!
    return 0;
}
MSH_CMD_EXPORT(tst5, memery memheap test5);

细节3: meamheap初始化
static struct rt_memheap _heap_sram;
void rt_system_heap2_init(void *begin_addr, void *end_addr)
{
    /* initialize a default heap in the system */
    rt_memheap_init(&_heap_sram,
                    "heapSRAM",
                    begin_addr,
                    (rt_uint32_t)end_addr - (rt_uint32_t)begin_addr);
}