Urgent help on USB HID Combined Mouse and Keyboard

[HHass]

Hello All,

I have successfully Combined Mouse and Keyboard as a USB device by modifying the USB HID Mouse example and my PC can recognize them. However, I can easily detect the mouse movement and can't detect the Keyboard. By using Bus Hound I could see there is something related to the Keyboard when I press the Button I used for the Keyboard on my board (Which I assign for it Letter 'A').

I made the following modifications:

file: usbd_hid.h

#define USB_ENDPOINT_DESCRIPTOR_TYPE      0x09//0x05   

#define HID_EPIN_SIZE         0x08U//0x04U

#define HID_MOUSE_REPORT_DESC_SIZE  101//(47+54)

file: usbd_hid.c

/* USB HID device FS Configuration Descriptor */

__ALIGN_BEGIN static uint8_t USBD_HID_CfgFSDesc[USB_HID_CONFIG_DESC_SIZ] __ALIGN_END =

{

.

.

.

.

 0x00,/*0x01*/    /*bInterfaceSubClass : 1=BOOT, 0=no boot*/

 0x00,/*0x02*/    /*nInterfaceProtocol : 0=none, 1=keyboard, 2=mouse*/

.

.

.

.

}

MOUSE and Keyboard Report Descriptor

__ALIGN_BEGIN static uint8_t HID_MOUSE_ReportDesc[HID_MOUSE_REPORT_DESC_SIZE] __ALIGN_END =

{

/* 47 */

  0x05, 0x01,          // USAGE_PAGE (Generic Desktop)

  0x09, 0x06,          // USAGE (Keyboard)

  0xa1, 0x01,          // COLLECTION (Application)

  0x85, 0x01,          //  REPORT_ID (1)

  0x05, 0x07,          //  USAGE_PAGE (Keyboard)

  0x19, 0xe0,          //  USAGE_MINIMUM (Keyboard LeftControl)

  0x29, 0xe7,          //  USAGE_MAXIMUM (Keyboard Right GUI)

  0x15, 0x00,          //  LOGICAL_MINIMUM (0)

  0x25, 0x01,          //  LOGICAL_MAXIMUM (1)

  0x75, 0x01,          //  REPORT_SIZE (1)

  0x95, 0x08,          //  REPORT_COUNT (8)

  0x81, 0x02,          //  INPUT (Data,Var,Abs)

  0x95, 0x01,          //  REPORT_COUNT (1)

  0x75, 0x08,          //  REPORT_SIZE (8)

  0x81, 0x03,          //  INPUT (Cnst,Var,Abs)

  0x95, 0x06,          //  REPORT_COUNT (6)

  0x75, 0x08,          //  REPORT_SIZE (8)

  0x15, 0x00,          //  LOGICAL_MINIMUM (0)

  0x25, 0x65,          //  LOGICAL_MAXIMUM (101)

  0x05, 0x07,          //  USAGE_PAGE (Keyboard)

  0x19, 0x00,          //  USAGE_MINIMUM (Reserved (no event indicated))

  0x29, 0x65,          //  USAGE_MAXIMUM (Keyboard Application)

  0x81, 0x00,          //  INPUT (Data,Ary,Abs)

  0xc0,             // END_COLLECTION

/* 54 */

  0x05, 0x01,          // USAGE_PAGE (Generic Desktop)

  0x09, 0x02,          // USAGE (Mouse)

  0xa1, 0x01,          // COLLECTION (Application)

  0x09, 0x01,          //  USAGE (Pointer)

  0xa1, 0x00,          //  COLLECTION (Physical)

  0x85, 0x02,          //   REPORT_ID (2)

  0x05, 0x09,          //   USAGE_PAGE (Button)

  0x19, 0x01,          //   USAGE_MINIMUM (Button 1)

  0x29, 0x03,          //   USAGE_MAXIMUM (Button 3)

  0x15, 0x00,          //   LOGICAL_MINIMUM (0)

  0x25, 0x01,          //   LOGICAL_MAXIMUM (1)

  0x95, 0x03,          //   REPORT_COUNT (3)

  0x75, 0x01,          //   REPORT_SIZE (1)

  0x81, 0x02,          //   INPUT (Data,Var,Abs)

  0x95, 0x01,          //   REPORT_COUNT (1)

  0x75, 0x05,          //   REPORT_SIZE (5)

  0x81, 0x03,          //   INPUT (Cnst,Var,Abs)

  0x05, 0x01,          //   USAGE_PAGE (Generic Desktop)

  0x09, 0x30,          //   USAGE (X)

  0x09, 0x31,          //   USAGE (Y)

  0x09, 0x38,          //   USAGE (Wheel)

  0x15, 0x81,          //   LOGICAL_MINIMUM (-127)

  0x25, 0x7f,          //   LOGICAL_MAXIMUM (127)

  0x75, 0x08,          //   REPORT_SIZE (8)

  0x95, 0x03,          //   REPORT_COUNT (3)

  0x81, 0x06,          //   INPUT (Data,Var,Rel)

  0xc0,             //  END_COLLECTION

  0xc0,             // END_COLLECTION

}; 

Please, I need your assistance to finish this part.

[Pavel A.]

I've made a similar thing with multiple collections on STM32F072. Maybe the problem is in code that you have not shown.

Check translation of the letter A to HID code. After sending it, send another "empty" report to indicate release of the key.

-- pa

[HHass]

Dear @Pavel A.​ ,

I really appreciate your response and I uploaded my code on Github for your check.

Could you please have a look and guide me to fix it?

https://github.com/hossamfadeel/STEM32_CustomHID_USB_4

The design has two main parts:

1- Joystick acts as a mouse.

2- Push Button to send Page Down control of Keyboard.

Waiting for your reply ....

Thanks again,

Hossam

[Pavel A.]

Hi @HHass​ 

For the keyboard release report:

https://github.com/hossamfadeel/STEM32_CustomHID_USB_4/blob/7f8b9b7e057565c368223bad49c0e313261f6446/Src/main.c#L1251

you need to wait until the USB TX becomes ready. And it becomes ready only when the host sends IN token.

This takes time. I think this is the reason why keyboard reports don't work.

Waiting in the EXTI interrupt handler is possible if USB interrupt priority is higher and it can preempt the EXTI ISR.

But it is better to avoid waiting in ISRs and make a more complex design with a "background process".

Sorry I don't have a ready code to share but the idea is to call USBD_HID_SendReport only when the TX is ready.

Regards,

-- pa