请教下SPI Flash 的文件系统

发布于 2013-11-05 17:20:10 浏览：3771 订阅该版

最近刚刚加入RT-Thread,打算采用SK-LPC1788硬件做一个网页设置的系统,但是在SPI接口部分不是非常的理解.
其中参考了realtouch-stm32f4-master的部分SPI驱动,但是还是没有理解该SPI驱动的架构,希望高手能够指点下。
具体部分出在了   static struct stm32_spi_bus stm32_spi;
```struct stm32_spi_bus
{
    struct rt_spi_bus parent;
    SPI_TypeDef * SPI;
#ifdef SPI_USE_DMA
    DMA_Stream_TypeDef * DMA_Stream_TX;
    uint32_t DMA_Channel_TX;

DMA_Stream_TypeDef * DMA_Stream_RX;
    uint32_t DMA_Channel_RX;

uint32_t DMA_Channel_TX_FLAG_TC;
//    uint32_t DMA_Channel_TX_FLAG_TE;
    uint32_t DMA_Channel_RX_FLAG_TC;
//    uint32_t DMA_Channel_RX_FLAG_TE;
#endif /* #ifdef SPI_USE_DMA */
};```
这个定义是做什么的了？

如下的SPI总线和SPI设备之间是个什么样的关系了？

```struct rt_spi_ops;
struct rt_spi_bus
{
	struct rt_device parent;
	const struct rt_spi_ops *ops;

struct rt_mutex lock;
	struct rt_spi_device* owner;
};

/**
 * SPI operators
 */
struct rt_spi_ops
{
	rt_err_t (*configure)(struct rt_spi_device* device, struct rt_spi_configuration* configuration);
	rt_uint32_t (*xfer)(struct rt_spi_device* device, struct rt_spi_message* message);
};

/**
 * SPI Virtual BUS, one device must connected to a virtual BUS
 */
struct rt_spi_device
{
	struct rt_device parent;
	struct rt_spi_bus *bus;

struct rt_spi_configuration config;
};
#define SPI_DEVICE(dev)	((struct rt_spi_device*)(dev))```

有没有更加易懂的SPI Flash加文件系统的例程了？