STM32H750,u32_t数据非四字节对齐访问导致HardFault

wjp2547532

PACK_STRUCT_BEGIN
/* The IPv4 header */
struct ip_hdr {
  /* version / header length */
  PACK_STRUCT_FLD_8(u8_t _v_hl);
  /* type of service */
  PACK_STRUCT_FLD_8(u8_t _tos);
  /* total length */
  PACK_STRUCT_FIELD(u16_t _len);
  /* identification */
  PACK_STRUCT_FIELD(u16_t _id);
  /* fragment offset field */
  PACK_STRUCT_FIELD(u16_t _offset);
#define IP_RF 0x8000U        /* reserved fragment flag */
#define IP_DF 0x4000U        /* don't fragment flag */
#define IP_MF 0x2000U        /* more fragments flag */
#define IP_OFFMASK 0x1fffU   /* mask for fragmenting bits */
  /* time to live */
  PACK_STRUCT_FLD_8(u8_t _ttl);
  /* protocol*/
  PACK_STRUCT_FLD_8(u8_t _proto);
  /* checksum */
  PACK_STRUCT_FIELD(u16_t _chksum);
  /* source and destination IP addresses */
  PACK_STRUCT_FLD_S(ip4_addr_p_t src);
  PACK_STRUCT_FLD_S(ip4_addr_p_t dest);
} PACK_STRUCT_STRUCT;
PACK_STRUCT_END

_v_hl = 0x3004120e, _tos = 0x3004120f, _len = 0x30041210, id = 0x30041212, _offset = 0x30041214, _ttl = 0x30041216, _proto = 0x30041217          _chksum = 0x30041218, src = 0x3004121a, dest = 0x3004121e, src.addr = 0x3004121a, dest.addr = 0x3004121e

IP协议的header结构体因为需要未进行四字节对齐，src.addr为u32_t类型，而src.addr的地址不是四字节对齐，导致访问src.addr时进入HardFault
请问有大佬知道这个问题应该怎么解决么

wjp2547532

顶一哈