This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

HID Example for MCBSTM32E change ReportDescriptor

Hello everybody,

i have here an MCBSTM32E and i tried to write my own HID client on the PC.
It worked already fine but now i want to send more then just one Byte. But i dont know how i have to change the ReportDescriptor on the Board and which other settings i have to change.
I hope you can help me and explain which settings need to be changed.

regards
Mathias

0 Chinzei Tsuneo over 15 years ago

See this topic,
http://www.keil.com/forum/11137/

Above topic was discussed on HID example for LPC2148.
Keil example code is common with STM32, at least, on descriptors.

Tsuneo
Cancel
Vote up 0 Vote down

Cancel

0 Mathias D over 15 years ago in reply to Chinzei Tsuneo

Hi Tsuneo,

thanks for you answer. I read the Topic and changed the HID-Example of the MCBSTM32E like you wrote there.
But i still have some problems.
This is my ReportDescriptor

usbdesc.c

#define HID_INPUT_REPORT_BYTES       64              /* size of report in Bytes */
#define HID_OUTPUT_REPORT_BYTES      1              /* size of report in Bytes */
#define HID_FEATURE_REPORT_BYTES     1              /* size of report in Bytes */

const U8 HID_ReportDescriptor[] = {
  HID_UsagePageVendor( 0x00                     ),
  HID_Usage          ( 0x01                     ),
  HID_Collection     ( HID_Application          ),
    HID_LogicalMin   ( 0                        ),  /* value range: 0 - 0xFF */
    HID_LogicalMaxS  ( 0xFF                     ),
    HID_ReportSize   ( 8                        ),  /* 8 bits */
    HID_ReportCount  ( HID_INPUT_REPORT_BYTES   ),
    HID_Usage        ( 0x01                     ),
    HID_Input        ( HID_Data | HID_Variable | HID_Absolute ),
    HID_ReportCount  ( HID_OUTPUT_REPORT_BYTES  ),
    HID_Usage        ( 0x01                     ),
    HID_Output       ( HID_Data | HID_Variable | HID_Absolute ),
    HID_ReportCount  ( HID_FEATURE_REPORT_BYTES ),
    HID_Usage        ( 0x01                     ),
    HID_Feature      ( HID_Data | HID_Variable | HID_Absolute ),
  HID_EndCollection,
};

/* USB Configuration Descriptor */
/*   All Descriptors (Configuration, Interface, Endpoint, Class, Vendor) */
const U8 USB_ConfigDescriptor[] = {
...

/* Endpoint, HID Interrupt In */
  USB_ENDPOINT_DESC_SIZE,            /* bLength */
  USB_ENDPOINT_DESCRIPTOR_TYPE,      /* bDescriptorType */
  USB_ENDPOINT_IN(1),                /* bEndpointAddress */
  USB_ENDPOINT_TYPE_INTERRUPT,       /* bmAttributes */
  WBVAL(0x0040),                     /* wMaxPacketSize */
  0x20,          /* 32ms */          /* bInterval */
/* Terminator */
  0                                  /* bLength */
};

The variable InReport i defined like this:

main.c

U8 InReport[HID_INPUT_REPORT_BYTES];

But when i try to compile i get two errors.
Both here:

usbuser.c

#if USB_CONFIGURE_EVENT
void USB_Configure_Event (void) {

  if (USB_Configuration) {                   /* Check if USB is configured */
    GetInReport();
    USB_WriteEP(HID_EP_IN, &InReport, sizeof(InReport));
  }
}
#endif

/*
 *  USB Endpoint 1 Event Callback
 *   Called automatically on USB Endpoint 1 Event
 *    Parameter:       event
 */

void USB_EndPoint1 (U32 event) {

  switch (event) {
    case USB_EVT_IN:
      GetInReport();
      USB_WriteEP(HID_EP_IN, &InReport, sizeof(InReport));
      break;
  }
}

The problem is the &InReport but what should i write here instead? Just InReport oder &InReport[0]?

The same here:

hiduser.c

BOOL HID_GetReport(void){

  /*ReportID = SetupPacket.wValue.WB.L; */
  switch (SetupPacket.wValue.WB.H){
    case HID_REPORT_INPUT:
      GetInReport();
      EPOBuf[0] = InReport;
      break;
    case HID_REPORT_OUTPUT:
      return (__FALSE);     /*Not Supported*/
    case HID_REPORT_FEATURE:
      return (__FALSE);     /*Not Supported*/
  }
  return (__TRUE)
}

What should i write instead of

EPOBuf[0] = InReport;

Hope you can help me.

regards
Mathias