令人极度困惑的指针问题，求大神帮忙看看

• 本帖最后由 朋友，你好 于 2020-1-11 12:08 编辑 *

```void save_data(uint8_t msg, uint16_t size)
{
uint32_t len = 8192;
uint8_t data[80];
uint8_t i = 0;
while(len < 20400)
{
nwy_flash_read(len, data, 80);
rt_thread_delay(1);
for(i=0; i<77;)
{
rt_kprintf(“i = %d,data = %x,len = %d
“,i, data,len);
if((uint16_t)(&data) == 0xdaeb)
{
rt_kprintf(“data = UPLOAD_DATA_FLAG
“);
i += 5+(data[i+3]<<8|data[i+4]);
}
else if((uint32_t)(&data) == 0xffffffff)
{
rt_kprintf(“data = %x
“, data);
rt_memset(data, 0, 80); (uint16_t*)data = UPLOAD_DATA_FLAG;
data[2] = 1;
data[3] = size>>8;
data[4] = size;

            rt_memcpy(&data[5], msg, size);
            SPI_W25QXX_Write_NoCheck(data, len+i, 5+size);
            return;               
        }
        else
        {
            i++;
        }
    }
    len += 80;
}
if(len >= 20400)
{
    *(uint16_t*)data = UPLOAD_DATA_FLAG;
    data[2] = 1;
    data[3] = size>>8;
    data[4] = size;
    rt_memcpy(&data[5], msg, size);
    nwy_flash_write(FLASH_UPLOAD_DATA_ADDR, data, 5+size);
    rt_memset(data, 0xff, 1);
    nwy_flash_write(FLASH_UPLOAD_DATA_ADDR+4096, data, 1);
    nwy_flash_write(FLASH_UPLOAD_DATA_ADDR+8192, data, 1);
}     

}```

运行结果如下：

i = 0,data = eb,len = 8192
data = UPLOAD_DATA_FLAG
i = 48,data = eb,len = 8192
data = UPLOAD_DATA_FLAG
i = 0,data = 0,len = 8272
psr: 0x01000000
pc: 0x08013d24
lr: 0x08017c47
r12: 0x00000000
r03: 0x08013ce3
r02: 0x40013800
r01: 0x00000000
r00: 0x2000564f
hard fault on thread: UploadData
thread pri status sp stack size max used left tick error

at_clnt0 9 suspend 0x00000098 0x00000600 35% 0x00000005 000
UploadData 10 running 0x00000164 0x00001400 36% 0x0000000a 000
tshell 10 suspend 0x0000007c 0x00000800 07% 0x0000000a 000
tidle0 31 ready 0x00000054 0x00000100 32% 0x00000019 000
timer 4 suspend 0x0000005c 0x00000180 23% 0x00000009 000

当把程序改成如下形式之后，就没问题了，可以正常运行。

```void save_data(uint8_t msg, uint16_t size)
{
uint32_t len = 8192;
uint8_t data[80];
volatile uint8_t i = 0;
while(len < 20400)
{
nwy_flash_read(len, data, 80);
rt_thread_delay(1);
for(i=0; i<77;)
{
// if((uint16_t)(&data) == 0xdaeb)
if((data == 0xeb) && (data[i+1] == 0xda))
{
i += 5+(data[i+3]<<8|data[i+4]);
}
// else if((uint32_t)(&data) == 0xffffffff)
else if((data == 0xff) && (data[i+1] == 0xff) && (data[i+2] == 0xff) && (data[i+3] == 0xff))
{ (uint16_t*)data = UPLOAD_DATA_FLAG;
data[2] = 1;
data[3] = size>>8;
data[4] = size;

            rt_memcpy(&data[5], msg, size);
            SPI_W25QXX_Write_NoCheck(data, len+i, 5+size);
            return;                
        }
        else
        {
            i++;
        }                
    }
    len += 80;
}
if(len >= 20400)
{
    *(uint16_t*)data = UPLOAD_DATA_FLAG;
    data[2] = 1;
    data[3] = size>>8;
    data[4] = size;
    rt_memcpy(&data[5], msg, size);
    nwy_flash_write(FLASH_UPLOAD_DATA_ADDR, data, 5+size);
    rt_memset(data, 0xff, 1);
    nwy_flash_write(FLASH_UPLOAD_DATA_ADDR+4096, data, 1);
    nwy_flash_write(FLASH_UPLOAD_DATA_ADDR+8192, data, 1);
}     

}
```求解。。。