主机协议栈

关于主机协议栈中结构体的命名、分类、成员组成,参考下面这两张图:

../_images/api_host1.png
../_images/api_host2.png

CORE

CLASS 驱动信息结构体

struct usbh_class_info {
    uint8_t match_flags; /* Used for product specific matches; range is inclusive */
    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

struct usbh_endpoint {
    struct usb_endpoint_descriptor ep_desc;
};

接口备用结构体

struct usbh_interface_altsetting {
    struct usb_interface_descriptor intf_desc;
    struct usbh_endpoint ep[CONFIG_USBHOST_MAX_ENDPOINTS];
};

接口结构体

struct usbh_interface {
    struct usbh_interface_altsetting altsetting[CONFIG_USBHOST_MAX_INTF_ALTSETTINGS];
    uint8_t altsetting_num;
    char devname[CONFIG_USBHOST_DEV_NAMELEN];
    struct usbh_class_driver *class_driver;
    void *priv;
};

配置结构体

struct usbh_configuration {
    struct usb_configuration_descriptor config_desc;
    struct usbh_interface intf[CONFIG_USBHOST_MAX_INTERFACES];
};

hubport 结构体

struct usbh_hubport {
    bool connected;   /* True: device connected; false: disconnected */
    uint8_t port;     /* Hub port index */
    uint8_t dev_addr; /* device address */
    uint8_t speed;    /* device speed */
    struct usb_device_descriptor device_desc;
    struct usbh_configuration config;
    const char *iManufacturer;
    const char *iProduct;
    const char *iSerialNumber;
    uint8_t *raw_config_desc;
    struct usb_setup_packet *setup;
    struct usbh_hub *parent;
    struct usb_endpoint_descriptor ep0;
    struct usbh_urb ep0_urb;
    usb_osal_mutex_t mutex;
};

hub 结构体

struct usbh_hub {
    usb_slist_t list;
    bool connected;
    bool is_roothub;
    uint8_t index;
    uint8_t hub_addr;
    struct usb_hub_descriptor hub_desc;
    struct usbh_hubport child[CONFIG_USBHOST_MAX_EHPORTS];
    struct usbh_hubport *parent;
    struct usb_endpoint_descriptor *intin;
    struct usbh_urb intin_urb;
    uint8_t *int_buffer;
};

usbh_initialize

usbh_initialize 用来初始化 usb 主机协议栈,包括:初始化 usb 主机控制器,创建 roothub 设备,创建 hub 检测线程。

int usbh_initialize(uint8_t busid, uint32_t reg_base);
  • busid bus id,从 0开始,不能超过 CONFIG_USBHOST_MAX_BUS

  • reg_base hcd 寄存器基地址

  • return 0 表示正常其他表示错误

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

lsusb

lsusb 用来查看和操作 hub 上的设备信息。需要借助 shell 插件使用。

int lsusb(int argc, char **argv);

CDC ACM

HID

MSC

RNDIS