USB HID Mouse Driver using LPC2148

Hi Tsuneo,

I made the Report Descriptor in readable format now:-)

const U8 HID_ReportDescriptor[] = {
        HID_UsagePage(HID_USAGE_PAGE_GENERIC),
        HID_Usage(HID_USAGE_GENERIC_MOUSE),
        HID_Collection (HID_Application),
          HID_Usage (HID_USAGE_GENERIC_POINTER),
          HID_Collection (HID_Physical),
            HID_ReportCount (3),
            HID_ReportSize (1),
            HID_UsagePage (HID_USAGE_PAGE_BUTTON),
            HID_UsageMin (1),
            HID_UsageMax (3),
            HID_LogicalMin (0),
            HID_LogicalMax (1),
            HID_Input (HID_Data | HID_Variable | HID_Absolute),
            HID_ReportCount (1),
            HID_ReportSize (5),
            HID_Input (HID_Constant),
            HID_ReportSize (8),
            HID_ReportCount (2),
            HID_UsagePage(HID_USAGE_PAGE_GENERIC),
            HID_Usage(HID_USAGE_GENERIC_X),
            HID_Usage(HID_USAGE_GENERIC_Y),
            HID_LogicalMin(0x81),
            HID_LogicalMax (0x7F),
            HID_Input (HID_Data | HID_Variable | HID_Relative),
          HID_EndCollection,
        HID_EndCollection
};

As the USB mouse protocol requires 3 bytes of Data (Button, X Displacement, Y Displacement), I declared U8 InReport as

U8 InReport[3] = {0};

void GetInReport (void) function does nothing (Code stubing will be done later)

I feel by doing so, it should work but....:-( It is still not working...

Are there any other changes i need to take care ?

Thanks & Regards,
Kamal Joshi

Hi Tsuneo,

I made the Report Descriptor in readable format now:-)

const U8 HID_ReportDescriptor[] = {
        HID_UsagePage(HID_USAGE_PAGE_GENERIC),
        HID_Usage(HID_USAGE_GENERIC_MOUSE),
        HID_Collection (HID_Application),
          HID_Usage (HID_USAGE_GENERIC_POINTER),
          HID_Collection (HID_Physical),
            HID_ReportCount (3),
            HID_ReportSize (1),
            HID_UsagePage (HID_USAGE_PAGE_BUTTON),
            HID_UsageMin (1),
            HID_UsageMax (3),
            HID_LogicalMin (0),
            HID_LogicalMax (1),
            HID_Input (HID_Data | HID_Variable | HID_Absolute),
            HID_ReportCount (1),
            HID_ReportSize (5),
            HID_Input (HID_Constant),
            HID_ReportSize (8),
            HID_ReportCount (2),
            HID_UsagePage(HID_USAGE_PAGE_GENERIC),
            HID_Usage(HID_USAGE_GENERIC_X),
            HID_Usage(HID_USAGE_GENERIC_Y),
            HID_LogicalMin(0x81),
            HID_LogicalMax (0x7F),
            HID_Input (HID_Data | HID_Variable | HID_Relative),
          HID_EndCollection,
        HID_EndCollection
};

As the USB mouse protocol requires 3 bytes of Data (Button, X Displacement, Y Displacement), I declared U8 InReport as

U8 InReport[3] = {0};

void GetInReport (void) function does nothing (Code stubing will be done later)

I feel by doing so, it should work but....:-( It is still not working...

Are there any other changes i need to take care ?

Thanks & Regards,
Kamal Joshi

Are you working on Keil HID example?

Then, you don't need to swap entire descriptors.
Replace just the report descriptor.

I see some errors on the config descriptor set in above post, for example, wTotalLength field. But it's pain to examine the figures without any comment for the fields.
I recomend you to recover the original descriptors from the example.

For other change,

demo.c

BYTE InReport[3];      /* HID Input Report - 3 bytes for mouse */

/*
 *  Get HID Input Report -> InReport
 */

void GetInReport (void) {
  //
  //  Fill InReport[]
  //
  //   InReport[0]    mouse buttons, bit 0: left, bit 1: right, bit2: middle
  //   InReport[1]    X axis relative movement
  //   InReport[2]    Y axis relative movement
  //
}

Tsuneo

Hello guys,

I am a first timer with USB and like many others, VERY CONFUSED.

To start with, i have downloaded the example code for USBHID for LPC2368 and it is not working, leading to more confusion but most of them are conceptual and here are a few of them :

1. How will the code call the functions usbcore.c ?

2. How will the code initialize the descriptors and endpoints ?

Any help will be greatly appreciated.

Thanks.
Nitin

Don't you think you should start with a new thread, instead of hijacking someone elses?

Yes, I should have.

Apologies for that.

Can you please tell me how to start a new one ?

Thanks.

Got it ..

Thanks.

Please Help Tsuneo !

Sorry for posting here again.