为什么配置spi时将配置结构体定义在main中会出现内存访问错误呢？

请问大家下我将配置spi用的结构体定义在main函数中会出错，而定义为全局变量则一切正常。

出错代码

int main(void)
{
rt_err_t rt = RT_EOK;
rt_device_t device;
struct rt_spi_device device_llcc68;
struct rt_spi_configuration llcc68_cfg;
llcc68_cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_0 | RT_SPI_MSB;
llcc68_cfg.data_width = 8;
llcc68_cfg.max_hz = 40000000;
rt = rt_hw_spi_device_attach("spi1", "LLCC68_2", GET_PIN(3, 26));
rt_kprintf("rt = 0x%x\r\n", rt);
rt = rt_spi_configure(&device_llcc68, &llcc68_cfg);
rt_kprintf("rt = 0x%x\r\n", rt);
device = rt_device_find("LLCC68_2");
while(1)
{
rt_thread_mdelay(500);
}
}

正常代码

struct rt_spi_device device_llcc68;
struct rt_spi_configuration llcc68_cfg;

int main(void)
{
rt_err_t rt = RT_EOK;
rt_device_t device;
llcc68_cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_0 | RT_SPI_MSB;
llcc68_cfg.data_width = 8;
llcc68_cfg.max_hz = 40000000;
rt = rt_hw_spi_device_attach("spi1", "LLCC68_2", GET_PIN(3, 26));
rt_kprintf("rt = 0x%x\r\n", rt);
rt = rt_spi_configure(&device_llcc68, &llcc68_cfg);
rt_kprintf("rt = 0x%x\r\n", rt);
device = rt_device_find("LLCC68_2");
while(1)
{
rt_thread_mdelay(500);
}
}
感谢！！