出现这个错误，usage fault: SCB_CFSR_UFSR:0x02 INVSTATE，发现是线程中一个数据处理函数问题，涉及指针 为啥呢

msh />psr: 0x60000000
r00: 0x20004110
r01: 0x20004130
r02: 0xffffffff
r03: 0x00000000
r04: 0x00000000
r05: 0x00000000
r06: 0x00000000
r07: 0x00000000
r08: 0x00000000
r09: 0x00400138
r10: 0x000001c2
r11: 0xdeadbeef
r12: 0x00000000
 lr: 0x08003989
 pc: 0x00000000
hard fault on thread: dcm250
thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
dcm250     1  running 0x0000008c 0x00000400    13%   0x00000014 -02
tshell    20  suspend 0x00000138 0x00001000    07%   0x0000000a 000
tidle0    31  ready   0x00000040 0x00000100    34%   0x0000001a 000
timer      4  suspend 0x00000070 0x00000200    25%   0x00000009 000
usage fault:
SCB_CFSR_UFSR:0x02 INVSTATE

Read_angleData(&dcm.pitch, &dcm.roll, &dcm.head);
void Read_angleData(float *pitch, float *roll, float *head)
{
    uint8_t buff[32];
    rt_memcpy(buff, dcm.rxbuff, dcm.rx_len+1);
    if(buff[3] == 0x84)
    {
        *pitch = (buff[4] & 0x0F)*100 + (buff[5]>>4)*10 + (buff[5] & 0x0F) + (buff[6]>>4)*0.1 + (buff[6] & 0x0F)*0.01;
        //if(buff[4] & 0xF0) *pitch = -*pitch;
        *roll = (buff[7] & 0x0F)*100 + (buff[8]>>4)*10 + (buff[8] & 0x0F) + (buff[9]>>4)*0.1 + (buff[9] & 0x0F)*0.01;
        //if(buff[7] & 0xF0) *roll = -*roll;
        *head = (buff[10] & 0x0F)*100 + (buff[11]>>4)*10 + (buff[11] & 0x0F) + (buff[12]>>4)*0.1 + (buff[12] & 0x0F)*0.01;
        //if(buff[10] & 0xF0) *head = -*head;
    }
    rt_memset(buff,0,sizeof(buff));
}