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0011_HID_Compliant_Device.md

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HID Compliant Deivce

参考文档

Modify Keyboard to Unknow Device

  • 仅将HID Keyboard声明改成HID Unknow设备： 
    HIDReportDscr:
    db 05h, 01h    ;    Usage Page (Generic Desktop)
    ;db 09h, 06h   ;    Usage (Keyboard)
    db 09h, 00h    ;    Usage (undefine)
    db 0A1h, 01h   ;    Collection (Application)
    db 05h, 07h    ;    Usage Page (Key codes)
    db 19h, 0E0h   ;    Usage minimum (234)
    db 29h, 0E7h   ;    Usage maximum (231)
    db 15h, 00h    ;    Logical minimum (0)
    db 25h, 01h    ;    Logical maximum (1)
    db 75h, 01h    ;    Report size (1)
    db 95h, 08h    ;    Report count (8)
    db 81h, 02h    ;    Input (data, variable, absolute)
    db 95h, 01h    ;    Report count (1)
    db 75h, 08h    ;    Report size (8)
    db 81h, 01h    ;    Input (constant)
    db 95h, 05h    ;    Report count (5)
    db 75h, 01h    ;    Report size (1)
    db 05h, 08h    ;    Usage Page (LED)
    db 19h, 01h    ;    Usage minimum (1)
    db 29h, 05h    ;    Usage maximum (5)
    db 91h, 02h    ;    Output (data, variable, absolute)
    db 95h, 01h    ;    Report count (1)
    db 75h, 03h    ;    Report size (3)
    db 91h, 01h    ;    Output (constant)
    db 95h, 03h    ;    Report count (3)
    db 75h, 08h    ;    Report size (8)
    db 15h, 00h    ;    Logical minimum (0)
    db 25h, 65h    ;    Logical maximum (101)
    db 05h, 07h    ;    Usage page (key codes)
    db 19h, 00h    ;    Usage minimum (0)
    db 29h, 65h    ;    Usage maximum (101)
    db 81h, 00h    ;    Input (data, array)
    db 0C0h        ;    End Collection
HIDReportDscrEnd:
    ./images/HID_Keyboard_To_HID_Compliant_Device.png
  • SimpleHIDWrite读写： ./images/HID_Keyboard_To_HID_Compliant_Device_Read_Write.png

Modify HID Report Dscr

  • HID Report Dscr 
    HIDReportDscr:
    db 05h, 01h    ;    Usage Page (Generic Desktop)
    ;db 09h, 06h   ;    Usage (Keyboard)
    db 09h, 00h    ;    Usage (undefine)
    db 0A1h, 01h   ;    Collection (Application)
    db 05h, 07h    ;    Usage Page (Key codes)
    db 19h, 0E0h   ;    Usage minimum (234)
    db 29h, 0E7h   ;    Usage maximum (231)
    db 15h, 00h    ;    Logical minimum (0)
    db 25h, 01h    ;    Logical maximum (1)
    db 75h, 01h    ;    Report size (1)
    db 95h, 08h    ;    Report count (8)
    db 81h, 02h    ;    Input (data, variable, absolute)
    db 95h, 05h    ;    Report count (5)
    db 75h, 01h    ;    Report size (1)
    db 05h, 08h    ;    Usage Page (LED)
    db 19h, 01h    ;    Usage minimum (1)
    db 29h, 05h    ;    Usage maximum (5)
    db 91h, 02h    ;    Output (data, variable, absolute)
    db 95h, 01h    ;    Report count (1)
    db 75h, 03h    ;    Report size (3)
    db 91h, 01h    ;    Output (constant)
    db 0C0h        ;    End Collection
HIDReportDscrEnd:
  • Deal With Report 
    void TD_Poll(void)             // Called repeatedly while the device is idle
{
    if( !(EP1INCS & bmEPBUSY) )    // Is the IN1BUF available,
    {
        buttons = PB0;
        buttons &= 0x01;
        if (((oldbuttons - buttons) != 0) && (keyStatus == KEY_UP) && (PB0 == 1))    //Change in button state
        {
            EP1INBUF[0] = 4;

            EP1INBC = 1;

            keyStatus = KEY_DOWN;
        } else if (((oldbuttons - buttons) == 0) && (keyStatus == KEY_DOWN) && (PB0 == 0)){
            EP1INBUF[0] = 0;

            EP1INBC = 1;
              
            keyStatus = KEY_UP;
        }
        oldbuttons = buttons;
    }

    if( !(EP1OUTCS & bmEPBUSY) )    // Is there something available
    {
        PB2 = ~PB2;

        EP1OUTBC = 0;                //Rearm endpoint buffer
    }
}
  • Data Transfer ./images/HID_Keyboard_To_HID_Compliant_Device_2_Byte.png
  • 从上可知，貌似我们没有设置Report id，接下来处理一下指定Report id；

Modify HID Report Dscr With Report ID

  • HID Report Dscr 
    HIDReportDscr:
    db 05h, 01h    ;    Usage Page (Generic Desktop)
    ;db 09h, 06h   ;    Usage (Keyboard)
    db 09h, 00h    ;    Usage (undefine)
    db 0A1h, 01h   ;    Collection (Application)
    db 85h, 01h    ;    Report id(1)
    db 05h, 07h    ;    Usage Page (Key codes)
    db 19h, 0E0h   ;    Usage minimum (234)
    db 29h, 0E7h   ;    Usage maximum (231)
    db 15h, 00h    ;    Logical minimum (0)
    db 25h, 01h    ;    Logical maximum (1)
    db 75h, 01h    ;    Report size (1)
    db 95h, 08h    ;    Report count (8)
    db 81h, 02h    ;    Input (data, variable, absolute)
    db 95h, 05h    ;    Report count (5)
    db 75h, 01h    ;    Report size (1)
    db 05h, 08h    ;    Usage Page (LED)
    db 19h, 01h    ;    Usage minimum (1)
    db 29h, 05h    ;    Usage maximum (5)
    db 91h, 02h    ;    Output (data, variable, absolute)
    db 95h, 01h    ;    Report count (1)
    db 75h, 03h    ;    Report size (3)
    db 91h, 01h    ;    Output (constant)
    db 0C0h        ;    End Collection
HIDReportDscrEnd:
  • Deal With Report 
    void TD_Poll(void)             // Called repeatedly while the device is idle
{
    if( !(EP1INCS & bmEPBUSY) )   // Is the IN1BUF available,
    {
        buttons = PB0;
        buttons &= 0x01;
        if (((oldbuttons - buttons) != 0) && (keyStatus == KEY_UP) && (PB0 == 1))   //Change in button state
        {
            EP1INBUF[0] = 1;
            EP1INBUF[1] = 4;

            EP1INBC = 2;

            keyStatus = KEY_DOWN;
        } else if (((oldbuttons - buttons) == 0) && (keyStatus == KEY_DOWN) && (PB0 == 0)){
            EP1INBUF[0] = 1;
            EP1INBUF[1] = 0;

            EP1INBC = 2;
           
            keyStatus = KEY_UP;
        } 
        oldbuttons = buttons;
    }

    if( !(EP1OUTCS & bmEPBUSY) )   // Is there something available
    {
        PB2 = ~PB2;

        EP1OUTBC = 0;            //Rearm endpoint buffer
    }
}
  • Data Transfer ./images/HID_Keyboard_To_HID_Compliant_Device_With_Report_ID.png
  • 结论：
    • 如果没有设定Report id，那么第一个字节可以当作数据字节，不过系统会自动补这个字节；
    • 如果设定了Report id，那么第一个字节是Report id，后面在跟数据，Report id需要手动填写；
    • Report id相当于对数据进行分类。