H743 hard fault on thread: erx？

发布于 2021-01-26 10:45:03 浏览：1614 订阅该版

H743在调试网络的时候出现：
```
00> psr: 0xa1000000
00> r00: 0x2402ef89
00> r01: 0x300400fd
00> r02: 0x80000000
00> r03: 0x000000ea
00> r04: 0x2402ef3c
00> r05: 0x00000000
00> r06: 0x2402ef3c
00> r07: 0xdeadbeef
00> r08: 0xdeadbeef
00> r09: 0xdeadbeef
00> r10: 0xdeadbeef
00> r11: 0xdeadbeef
00> r12: 0x2402ef4c
00>  lr: 0x0802d54b
00>  pc: 0x080005ae
00> hard fault on thread: erx
00> usage fault:
00> SCB_CFSR_UFSR:0x100 UNALIGNED 
```
大约指向 rt_stm32_eth_rx函数
![微信截图_20210126100638.png](https://oss-club.rt-thread.org/uploads/20210126/7f15a679a99effe8494b139fafbcf01c.png)
这个drv_eth.c是从ART-Pi移植过来的
![微信截图_20210126103632.png](https://oss-club.rt-thread.org/uploads/20210126/e0aed75eabf34f62e0376755b701a955.png)
函数rt_stm32_eth_rx
```c
/* receive data*/
struct pbuf *rt_stm32_eth_rx(rt_device_t dev)
{
    rt_uint32_t framelength = 0;
    rt_uint16_t l;
    struct pbuf *p = RT_NULL, *q;
    ETH_BufferTypeDef RxBuff;
    
  if(HAL_ETH_GetRxDataBuffer(&EthHandle, &RxBuff) == HAL_OK) 
  {
    HAL_ETH_GetRxDataLength(&EthHandle, (uint32_t *)&framelength);

/* Build Rx descriptor to be ready for next data reception */
    HAL_ETH_BuildRxDescriptors(&EthHandle);

/* Invalidate data cache for ETH Rx Buffers */
    SCB_InvalidateDCache_by_Addr((uint32_t *)RxBuff.buffer, framelength);
      
    p = pbuf_alloc(PBUF_RAW, framelength, PBUF_RAM);
    if (p != NULL)
    {
        for (q = p, l = 0; q != NULL; q = q->next)
        {
            memcpy((rt_uint8_t *)q->payload, (rt_uint8_t *)&RxBuff.buffer[l], q->len);
            l = l + q->len;
        }
    }
  }

return p;
}
```
这个函数没有完全理解，求问是不是这个memcpy函数导致的SCB_CFSR_UFSR:0x100 UNALIGNED 错误？换成rt_memcpy是否安全点