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[USB device design] - composite device, dual hid high-speed (64BYTE and 1024byte)
2022-07-25 11:49:00 【L_ seventeen】
Preface
In the work project , Some projects have high requirements for data throughput （ Such as the need to 5M/s About the bandwidth ）, So the author designed a high-speed HID, Endpoint size ：1024Byte equipment , But the company's previous products used endpoint size ：64Byte Full speed equipment , In order to ensure USB Device compatibility , So the author designed two interfaces HID equipment （Interface0：64Byte HID、Interface1：1024Byte HID）. Okay , Next, let's introduce double HID How to develop composite equipment .
Preparation
1. belt USB 2.0 High speed function MCU ( The author's NXP RT1052)
2.libusb 1.x edition （ The development host computer can use this library ）
3.VS2015 keil （IDE There are many environmental choices , Differ from man to man ）
HID Descriptor basic structure
- Configuration descriptor ： The number of interfaces mainly set is ：2
- Interface descriptors ： Interface 0, The endpoint descriptor is set to ：64Byte; Interface 1, The endpoint descriptor is set to ：1024Byte
-------------------------
Configuration Descriptor:
-------------------------
0x09 bLength
0x02 bDescriptorType
0x0049 wTotalLength (73 bytes)
0x02 bNumInterfaces
0x01 bConfigurationValue
0x00 iConfiguration
0xC0 bmAttributes (Self-powered Device)
0x32 bMaxPower (100 mA)
Interface Descriptor:
------------------------------
0x09 bLength
0x04 bDescriptorType
0x00 bInterfaceNumber
0x00 bAlternateSetting
0x02 bNumEndPoints
0x03 bInterfaceClass (Human Interface Device Class)
0x00 bInterfaceSubClass
0x00 bInterfaceProtocol
0x00 iInterface
HID Descriptor:
------------------------------
0x09 bLength
0x21 bDescriptorType
0x0110 bcdHID
0x21 bCountryCode
0x01 bNumDescriptors
0x22 bDescriptorType (Report descriptor)
0x001B bDescriptorLength
Endpoint Descriptor:
------------------------------
0x07 bLength
0x05 bDescriptorType
0x81 bEndpointAddress (IN endpoint 1)
0x03 bmAttributes (Transfer: Interrupt / Synch: None / Usage: Data)
0x0040 wMaxPacketSize (1 x 64 bytes)
0x01 bInterval (1 microframes)
Endpoint Descriptor:
------------------------------
0x07 bLength
0x05 bDescriptorType
0x02 bEndpointAddress (OUT endpoint 2)
0x03 bmAttributes (Transfer: Interrupt / Synch: None / Usage: Data)
0x0040 wMaxPacketSize (1 x 64 bytes)
0x01 bInterval (1 microframes)
Interface Descriptor:
------------------------------
0x09 bLength
0x04 bDescriptorType
0x01 bInterfaceNumber
0x00 bAlternateSetting
0x02 bNumEndPoints
0x03 bInterfaceClass (Human Interface Device Class)
0x00 bInterfaceSubClass
0x00 bInterfaceProtocol
0x00 iInterface
HID Descriptor:
------------------------------
0x09 bLength
0x21 bDescriptorType
0x0110 bcdHID
0x21 bCountryCode
0x01 bNumDescriptors
0x22 bDescriptorType (Report descriptor)
0x001B bDescriptorLength
Endpoint Descriptor:
------------------------------
0x07 bLength
0x05 bDescriptorType
0x83 bEndpointAddress (IN endpoint 3)
0x03 bmAttributes (Transfer: Interrupt / Synch: None / Usage: Data)
0x0400 wMaxPacketSize (1 x 1024 bytes)
0x01 bInterval (1 microframes)
Endpoint Descriptor:
------------------------------
0x07 bLength
0x05 bDescriptorType
0x03 bEndpointAddress (OUT endpoint 3)
0x03 bmAttributes (Transfer: Interrupt / Synch: None / Usage: Data)
0x0400 wMaxPacketSize (1 x 1024 bytes)
0x01 bInterval (1 microframes)
Interface 0,HID Report descriptor 64byte
uint8_t g_UsbDeviceHid64ByteReportDescriptor[] =
{
0x05, 0x01,
0x09, 0x00,
0xa1, 0x01,
0x15, 0x00,
0x25, 0xff,
0x19, 0x01,
0x29, 0x08,
0x95, 0x40,
0x75, 0x08,
0x81, 0x02,
0x19, 0x01,
0x29, 0x08,
0x91, 0x02,
0xc0
};
Interface 1：HID Report descriptor 1024byte
uint8_t g_UsbDeviceHid1024ByteReportDescriptor[] =
{
0x05, 0x01,
0x09, 0x00,
0xa1, 0x01,
0x15, 0x00,
0x25, 0xff,
0x19, 0x01,
0x29, 0x08,
0x95, 0x80,
0x75, 0x40,
0x81, 0x02,
0x19, 0x01,
0x29, 0x08,
0x91, 0x02,
0xc0
};
Realization USB Standard request
USB Standard request , does ： Bus reset , Set interface , Get interface , Get device descriptor , Get configuration descriptor , Get string descriptor and so on . Anyway, the host requests nothing , What the equipment provides .
usb_status_t USB_DeviceCallback(usb_device_handle handle, uint32_t event, void *param)
{
usb_status_t error = kStatus_USB_Success;
uint8_t *temp8 = (uint8_t *)param;
uint16_t *temp16 = (uint16_t *)param;
switch (event)
{
case kUSB_DeviceEventBusReset:
{
/* USB bus reset signal detected */
g_UsbDeviceHidGeneric.attach = 0U;
if (kStatus_USB_Success == USB_DeviceClassGetSpeed(CONTROLLER_ID, &g_UsbDeviceHidGeneric.speed))
{
USB_DeviceSetSpeed(handle, g_UsbDeviceHidGeneric.speed);
}
}
break;
case kUSB_DeviceEventSetConfiguration:
if(param)
{
/* Set device configuration request */
g_UsbDeviceHidGeneric.attach = 1U;
g_UsbDeviceHidGeneric.currentConfiguration = *temp8;
if (USB_HID_GENERIC_CONFIGURE_INDEX == (*temp8))
{
error = USB_DeviceHidRecv(
g_UsbDeviceHidGeneric.hidHandle, USB_HID_GENERIC_ENDPOINT_OUT,
(uint8_t *)g_UsbDeviceHidGeneric.buffer,
USB_HID_GENERIC_OUT_BUFFER_LENGTH);
error = USB_DeviceHidRecv(
g_UsbDeviceHidGeneric.hid1024ByteHandle, USB_HID_1024BYTE_ENDPOINT_OUT,
(uint8_t *)g_UsbDeviceHidGeneric.buffer1024byte,
USB_HID_1024BYTE_OUT_BUFFER_LENGTH);
}
}
break;
case kUSB_DeviceEventSetInterface:
if (g_UsbDeviceHidGeneric.attach)
{
/* Set device interface request */
uint8_t interface = (uint8_t)((*temp16 & 0xFF00U) >> 0x08U);
uint8_t alternateSetting = (uint8_t)(*temp16 & 0x00FFU);
if (interface == USB_HID_64BYTE_INTERFACE_INDEX)
{
g_UsbDeviceHidGeneric.currentInterfaceAlternateSetting[interface] = alternateSetting;
if (alternateSetting == 0U)
{
error = USB_DeviceHidRecv(
g_UsbDeviceHidGeneric.hidHandle, USB_HID_GENERIC_ENDPOINT_OUT,
(uint8_t *)g_UsbDeviceHidGeneric.buffer,
USB_HID_GENERIC_OUT_BUFFER_LENGTH);
}
}
else if (interface == USB_HID_1024BYTE_INTERFACE_INDEX)
{
g_UsbDeviceHidGeneric.currentInterfaceAlternateSetting[interface] = alternateSetting;
if (alternateSetting == 0U)
{
error = USB_DeviceHidRecv(
g_UsbDeviceHidGeneric.hid1024ByteHandle, USB_HID_1024BYTE_ENDPOINT_OUT,
(uint8_t *)g_UsbDeviceHidGeneric.buffer1024byte,
USB_HID_1024BYTE_OUT_BUFFER_LENGTH);
}
}
}
break;
case kUSB_DeviceEventGetConfiguration:
if (param)
{
/* Get current configuration request */
*temp8 = g_UsbDeviceHidGeneric.currentConfiguration;
error = kStatus_USB_Success;
}
break;
case kUSB_DeviceEventGetInterface:
if (param)
{
/* Get current alternate setting of the interface request */
uint8_t interface = (uint8_t)((*temp16 & 0xFF00U) >> 0x08U);
if (interface < USB_DEVICE_INTERFACE_COUNT)
{
*temp16 = (*temp16 & 0xFF00U) | g_UsbDeviceHidGeneric.currentInterfaceAlternateSetting[interface];
error = kStatus_USB_Success;
}
else
{
error = kStatus_USB_InvalidRequest;
}
}
break;
case kUSB_DeviceEventGetDeviceDescriptor:
if (param)
{
/* Get device descriptor request */
error = USB_DeviceGetDeviceDescriptor(handle, (usb_device_get_device_descriptor_struct_t *)param);
}
break;
case kUSB_DeviceEventGetConfigurationDescriptor:
if (param)
{
/* Get device configuration descriptor request */
error = USB_DeviceGetConfigurationDescriptor(handle,
(usb_device_get_configuration_descriptor_struct_t *)param);
}
break;
case kUSB_DeviceEventGetStringDescriptor:
if (param)
{
/* Get device string descriptor request */
error = USB_DeviceGetStringDescriptor(handle, (usb_device_get_string_descriptor_struct_t *)param);
}
break;
case kUSB_DeviceEventGetHidDescriptor:
if (param)
{
/* Get hid descriptor request */
error = USB_DeviceGetHidDescriptor(handle, (usb_device_get_hid_descriptor_struct_t *)param);
}
break;
case kUSB_DeviceEventGetHidReportDescriptor:
if (param)
{
/* Get hid report descriptor request */
error =
USB_DeviceGetHidReportDescriptor(handle, (usb_device_get_hid_report_descriptor_struct_t *)param);
}
break;
case kUSB_DeviceEventGetHidPhysicalDescriptor:
if (param)
{
/* Get hid physical descriptor request */
error = USB_DeviceGetHidPhysicalDescriptor(handle,
(usb_device_get_hid_physical_descriptor_struct_t *)param);
}
break;
default:
break;
}
return error;
}
HID Report descriptor request function modification ：
usb_status_t USB_DeviceGetHidReportDescriptor(usb_device_handle handle,
usb_device_get_hid_report_descriptor_struct_t *hidReportDescriptor)
{
if (USB_HID_64BYTE_INTERFACE_INDEX== hidReportDescriptor->interfaceNumber)
{
hidReportDescriptor->buffer = g_UsbDeviceHidGenericReportDescriptor;
hidReportDescriptor->length = USB_DESCRIPTOR_LENGTH_HID_GENERIC_REPORT;
}
else if(USB_HID_1024BYTE_INTERFACE_INDEX == hidReportDescriptor->interfaceNumber)
{
hidReportDescriptor->buffer = g_UsbDeviceHid1024ByteReportDescriptor;
hidReportDescriptor->length = USB_DESCRIPTOR_LENGTH_HID_GENERIC_REPORT;
}
else
{
return kStatus_USB_InvalidRequest;
}
return kStatus_USB_Success;
}
Connect the device to the host to see the enumeration status
Enumeration process
adopt Bus Hound You can see the enumeration process by capturing packets , Here's the picture ：
Design idea of upper computer
1. Traverse Windows All ports usb equipment , Get the number of devices
libusb_get_device_list
2. Traverse the descriptor information of all devices , adopt PID VID Wait for the information to find the equipment we specified
libusb_get_device_descriptor
3. Open the specified device
libusb_open
4. Query interface 0, Query interface 1
Get the interface endpoint IN OUT
5. Communication on endpoint （hid Is to interrupt transmission , So interrupt the transmission sdk）
libusb_interrupt_transfer
Refer to the author's previous articles ：HID High speed equipment 1024byte------ Setup of upper and lower computers
Transceiver test
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