请问为什么配置spi时将配置结构体定义在main中会出现内存访问错误

发布于 2022-11-23 15:23:19 浏览：481 订阅该版

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
```c
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
```c
	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！！