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is multi touch HID possible with nrf51822 chip?

akash naidu

Hi All,

       Currently i am working on nrf51822 for multi touch HID.For that i have chosen mouse HID example as a reference, in which i have changed HID descriptor(single touch) and some other things.So, that single touch has been working.

And, if i changed the HID descriptor for multi touch, touch devices(touch laptop) were showing "Bluetooth driver error".

is it possible multi touch HID over nrf51822 as a reference of mouse HID example?

if possible, what all changes are to be required to work for multi touch.

so, please guide me how to implement multi touch HID over nrf51822.

regards

akash.

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  • 0

    Hi Akash

    Multi touch should definitely be possible with the nRF51 series. 

    Microsoft have some good articles on how to use multi touch with windows, such as this one. Have you had a look at that?

    If you still can't make it work, are you able to attach your HID descriptor so I can have a look at it?

    Best regards
    Torbjørn

  • 0 in reply to ovrebekk

    Thanks for your precious reply.

    yes, i have gone through windows multi touch HID, but didn't work for me.

    so, i have taken one more multi touch HID, which has been working over USB.

    if i emulated same HID into Bluetooth stack, it was not working.

    here, i am attaching my HID

    0x05, 0x0D, // Usage Page (Digitizer)
    0x09, 0x04, // Usage (Touch Screen)
    0xA1, 0x01, // Collection (Application)
    0x09, 0x22, // Usage (Finger)
    0xA1, 0x02, // Collection (Logical)
    0x09, 0x42, // Usage (Tip Switch)
    0x15, 0x00, // Logical Minimum (0)
    0x25, 0x01, // Logical Maximum (1)
    0x75, 0x01, // Report Size (1)
    0x95, 0x01, // Report Count (1)
    0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
    0x09, 0x30, // Usage (Tip Pressure)
    0x25, 0x7F, // Logical Maximum (127)
    0x75, 0x07, // Report Size (7)
    0x95, 0x01, // Report Count (1)
    0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
    0x09, 0x51, // Usage (0x51)
    0x26, 0xFF, 0x00, // Logical Maximum (255)
    0x75, 0x08, // Report Size (8)
    0x95, 0x01, // Report Count (1)
    0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
    0x05, 0x01, // Usage Page (Generic Desktop Ctrls)
    0x09, 0x30, // Usage (X)
    0x09, 0x31, // Usage (Y)
    0x26, 0xFF, 0x7F, // Logical Maximum (32767)
    0x65, 0x00, // Unit (None)
    0x75, 0x10, // Report Size (16)
    0x95, 0x02, // Report Count (2)
    0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
    0xC0, // End Collection
    0x05, 0x0D, // Usage Page (Digitizer)
    0x27, 0xFF, 0xFF, 0x00, 0x00, // Logical Maximum (65534)
    0x75, 0x10, // Report Size (16)
    0x95, 0x01, // Report Count (1)
    0x09, 0x56, // Usage (0x56)
    0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
    0x09, 0x54, // Usage (0x54)
    0x25, 0x05, // Logical Maximum (12)
    0x75, 0x08, // Report Size (8)
    0x95, 0x01, // Report Count (1)
    0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
    0x05, 0x0D, // Usage Page (Digitizer)
    0x09, 0x55, // Usage (0x55)
    0x25, 0x0A, // Logical Maximum (12)
    0x75, 0x08, // Report Size (8)
    0x95, 0x01, // Report Count (1)
    0xB1, 0x02, // Feature (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
    0xC0, // End Collection

    is there any changes are to be required in code(like feature report, input report,output report)?

    because, single touch has been working without adding any feature reports and output reports.

    regards,

    akash.

  • 0 in reply to akash naidu

    Hi 

    My HID descriptor is almost identical to the one you sent, except there is a slight change around the scan time usage. The ordering of lines was a bit non standard in your version (if you compare the two I am sure you will spot it). 

    You will find the example attached:
    ble_app_hids_mouse.zip

    Unfortunately I tested this on the nRF52832, not the nRF51822. 

    Would you happen to have an nRF52DK available that you can test on?

    If not I will try to port the code to the nRF51 so you can test it there. 

    I don't expect the HID behavior to be different on the nRF52 compared to the nRF51, as long as the BLE connection works as normal. 

    Best regards
    Torbjørn

  • 0 in reply to ovrebekk

    Hi Ovrebekk

    Thanks for sharing the file.

    yes, i have nrf52DK and will test on it.

    On which SDK you have used to implement the project?

    if you share SDK version, so that i can download and edit the main file.Because i am using nRF5_SDK_15.0.0.

    Best regards

    Akash

  • 0 in reply to akash naidu

    Hi Akash

    Sorry about that, I should probably have shared the SDK version with you ;)

    I used the latest one, SDK v15.2.0. 

    Best regards
    Torbjørn

  • 0 in reply to ovrebekk

    Hi Ovrebekk

    Thanks for sharing SDK version.

    When i have downloaded and test it on nrf52DK, i am getting following logs...

    <info> app: HID Mouse example started.
    <info> app: m_whitelist_peer_cnt 1, MAX_PEERS_WLIST 8
    <info> app: Fast advertising.
    <info> app: Connected
    <error> app: Fatal error
    <warning> app: System reset

    Once connection has been established with Android mobile, then i am pressing button 4 for sending report.

    When i have pressed Button 4, was getting Fatal error.

    I have edited mouse example.

    could you please tell me what i have done wrongly?

    Best Regards,

    Akash 

  • 0 in reply to akash naidu

    Hi Akash

    What compiler are you using?

    Which Android phone are you testing on?

    Best regards
    Torbjørn

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