Objective Development Forums

Posted: **Sun Feb 28, 2010 2:33 am**

I never really needed a length greater than 64 before but found out setting my REPORT_SIZE to a 9 causes enumeration issues. Guessing there is a setting for htis as I know I have seen sizes in the 16's or at least greater then 8.

This is my config

Code: Select all

var usbDescriptorConfiguration[] = { 0 }; // dummy

uchar my_usbDescriptorConfiguration[] = {    /* USB configuration descriptor */
    9,          /* sizeof(usbDescriptorConfiguration): length of descriptor in bytes */
    USBDESCR_CONFIG,    /* descriptor type */
    18 + 7 * USB_CFG_HAVE_INTRIN_ENDPOINT + 9, 0,
                /* total length of data returned (including inlined descriptors) */
    1,          /* number of interfaces in this configuration */
    1,          /* index of this configuration */
    0,          /* configuration name string index */
#if USB_CFG_IS_SELF_POWERED
    USBATTR_SELFPOWER,  /* attributes */
#else
    USBATTR_BUSPOWER,   /* attributes */
#endif
    USB_CFG_MAX_BUS_POWER/2,            /* max USB current in 2mA units */
/* interface descriptor follows inline: */
    9,          /* sizeof(usbDescrInterface): length of descriptor in bytes */
    USBDESCR_INTERFACE, /* descriptor type */
    0,          /* index of this interface */
    0,          /* alternate setting for this interface */
    USB_CFG_HAVE_INTRIN_ENDPOINT,   /* endpoints excl 0: number of endpoint descriptors to follow */
    USB_CFG_INTERFACE_CLASS,
    USB_CFG_INTERFACE_SUBCLASS,
    USB_CFG_INTERFACE_PROTOCOL,
    0,          /* string index for interface */
//#if (USB_CFG_DESCR_PROPS_HID & 0xff)    /* HID descriptor */
    9,          /* sizeof(usbDescrHID): length of descriptor in bytes */
    USBDESCR_HID,   /* descriptor type: HID */
    0x01, 0x01, /* BCD representation of HID version */
    0x00,       /* target country code */
    0x01,       /* number of HID Report (or other HID class) Descriptor infos to follow */
    0x22,       /* descriptor type: report */
    USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH, 0,  /* total length of report descriptor */
//#endif
#if USB_CFG_HAVE_INTRIN_ENDPOINT    /* endpoint descriptor for endpoint 1 */
    7,          /* sizeof(usbDescrEndpoint) */
    USBDESCR_ENDPOINT,  /* descriptor type = endpoint */
    0x81,       /* IN endpoint number 1 */
    0x03,       /* attrib: Interrupt endpoint */
    8, 0,       /* maximum packet size */
    USB_CFG_INTR_POLL_INTERVAL, /* in ms */
#endif
};

and this is my descriptor

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const char generic_usbHidReportDescriptor[] PROGMEM = {
    0x05, 0x01,                    // USAGE_PAGE (Generic Desktop)
    0x09, 0x05,                    // USAGE (Gamepad)
    0xa1, 0x01,                    // COLLECTION (Application)
   
    0x09, 0x01,                    //   USAGE (Pointer)    
   0xa1, 0x00,                    //   COLLECTION (Physical)
   0x05, 0x01,                    //     USAGE_PAGE (Generic Desktop)
    0x09, 0x30,                    //     USAGE (X)
    0x09, 0x31,                    //     USAGE (Y)
   
   0x09, 0x33,                  //     USAGE (Rx)
   0x09, 0x34,                  //     USAGE (Ry)

   0x09, 0x35,                  //     USAGE (Rz)   
   0x09, 0x36,                  //     USAGE (Slider)   

    0x15, 0x00,                    //     LOGICAL_MINIMUM (0)
    0x26, 0xFF, 0x00,              //     LOGICAL_MAXIMUM (255)
    0x75, 0x08,                    //     REPORT_SIZE (8)
    0x95, 0x06,                    //     REPORT_COUNT (6)
    0x81, 0x02,                    //     INPUT (Data,Var,Abs)
   0xc0,                          //   END_COLLECTION (Physical)

    0x05, 0x09,                    // USAGE_PAGE (Button)
    0x19, 0x01,                    //   USAGE_MINIMUM (Button 1)
    0x29, 24,                    //   USAGE_MAXIMUM (Button 24)
    0x15, 0x00,                    //   LOGICAL_MINIMUM (0)
    0x25, 0x01,                    //   LOGICAL_MAXIMUM (1)
    0x75, 0x01,                    // REPORT_SIZE (1)
    0x95, 24,                    // REPORT_COUNT (24)
    0x81, 0x02,                    // INPUT (Data,Var,Abs)
    0xc0
};

What did I miss?

Posted: **Wed Mar 03, 2010 2:30 am**

ok looks like maximum packet size ( in my device config ) is the value that I need to increase but going from 8 to 9 prevents and packets from working, however going from 8 to 7, does just as expected, allows only 7. I also see the device descriptor has a packet size but changing that prevents my usb from enumerating. There must be another value I need to change to get more then 8.

I was also thinking it was in 8's but 16 didnt work.

Ok I use usbalyzer and see I'm chaining wMaxPacketSize but I also see bMaxPacketSize is still 8, cant find a way to change that nor am I sure it need to be ( but feel it should be 16 ).

Objective Development Forums

packet size > then 8

packet size > then 8

Re: report size > then 8