主机协议栈¶
CORE¶
CLASS 驱动信息结构体¶
struct usbh_class_info {
uint8_t class; /* Base device class code */
uint8_t subclass; /* Sub-class, depends on base class. Eg. */
uint8_t protocol; /* Protocol, depends on base class. Eg. */
uint16_t vid; /* Vendor ID (for vendor/product specific devices) */
uint16_t pid; /* Product ID (for vendor/product specific devices) */
const struct usbh_class_driver *class_driver;
};
端点结构体¶
typedef struct usbh_endpoint {
struct usb_endpoint_descriptor ep_desc;
} usbh_endpoint_t;
接口结构体¶
typedef struct usbh_interface {
struct usb_interface_descriptor intf_desc;
struct usbh_endpoint ep[CONFIG_USBHOST_EP_NUM];
char devname[CONFIG_USBHOST_DEV_NAMELEN];
struct usbh_class_driver *class_driver;
void *priv;
} usbh_interface_t;
配置结构体¶
typedef struct usbh_configuration {
struct usb_configuration_descriptor config_desc;
struct usbh_interface intf[CONFIG_USBHOST_INTF_NUM];
} usbh_configuration_t;
hubport 结构体¶
typedef struct usbh_hubport {
bool connected; /* True: device connected; false: disconnected */
bool port_change; /* True: port changed; false: port do not change */
uint8_t port; /* Hub port index */
uint8_t dev_addr; /* device address */
uint8_t speed; /* device speed */
usbh_epinfo_t ep0; /* control ep info */
struct usb_device_descriptor device_desc;
struct usbh_configuration config;
#if 0
uint8_t* config_desc;
#endif
struct usb_setup_packet *setup;
struct usbh_hub *parent; /*if NULL, is roothub*/
} usbh_hubport_t;
hub 结构体¶
typedef struct usbh_hub {
usb_slist_t list;
uint8_t index; /* Hub index */
uint8_t nports; /* Hub port number */
uint8_t dev_addr; /* Hub device address */
usbh_epinfo_t intin;
uint8_t *int_buffer;
struct hub_port_status *port_status;
struct usb_hub_descriptor hub_desc;
struct usbh_hubport child[CONFIG_USBHOST_EHPORTS];
struct usbh_hubport *parent; /* Parent hub port */
struct usb_work work;
} usbh_hub_t;
usbh_event_notify_handler¶
usbh_event_notify_handler 是 USB 中断中的核心，用于处理不同的中断标志。包括复位、端点0 IN/OUT/SETUP、其他端点 IN/OUT 、SUSPEND、RESUME、SOF 中断等等。用于需要在 porting 接口中的 USB中断中调用该接口。
void usbh_event_notify_handler(uint8_t event, uint8_t rhport);
event 中断事件
rhport roothub 端口号
其中 event 有如下类型：
enum usbh_event_type {
USBH_EVENT_ATTACHED,
USBH_EVENT_REMOVED,
};
usbh_initialize¶
usbh_initialize 用来初始化 usb 主机协议栈，包括：创建插拔检测用的信号量和枚举线程、高低工作队列、初始化 roothub端点0 配置，初始化 usb 主机控制器。
int usbh_initialize(void);
usbh_find_class_instance¶
usbh_find_class_instance 根据注册的 class 名称查找对应的 class 结构体句柄。
void *usbh_find_class_instance(const char *devname);
devname class 名称
return class 结构体句柄