Using Out endpoint on a HID joystick

[Uri_ba]

I've been playing around with LUFA for Joysticks for a while, And I've got pretty good at modifiying the basic joystick templates to do what I want,

However, in my current project, I'm trying to use the OUT endpoint in order to change settings on the fly from a software (which I'll write).

I've ended up with this HID descriptor (Using Low-level template as base).

const USB_Descriptor_Configuration_t PROGMEM ConfigurationDescriptor =

{

.Config =

{

.Header                 = {.Size = sizeof(USB_Descriptor_Configuration_Header_t), .Type = DTYPE_Configuration},

.TotalConfigurationSize = sizeof(USB_Descriptor_Configuration_t),

.TotalInterfaces        = 1,

.ConfigurationNumber    = 1,

.ConfigurationStrIndex  = NO_DESCRIPTOR,

.ConfigAttributes       = (USB_CONFIG_ATTR_RESERVED ),

.MaxPowerConsumption    = USB_CONFIG_POWER_MA(100)

},

.HID_Interface =

{

.Header                 = {.Size = sizeof(USB_Descriptor_Interface_t), .Type = DTYPE_Interface},

.InterfaceNumber        = INTERFACE_ID_Joystick,

.AlternateSetting       = 0x00,

.TotalEndpoints         = 2,

.Class                  = HID_CSCP_HIDClass,

.SubClass               = HID_CSCP_NonBootSubclass,

.Protocol               = HID_CSCP_NonBootProtocol,

.InterfaceStrIndex      = NO_DESCRIPTOR

},

.HID_JoystickHID =

{

.Header                 = {.Size = sizeof(USB_HID_Descriptor_HID_t), .Type = HID_DTYPE_HID},

.HIDSpec                = VERSION_BCD(1,1,1),

.CountryCode            = 0x00,

.TotalReportDescriptors = 1,

.HIDReportType          = HID_DTYPE_Report,

.HIDReportLength        = sizeof(JoystickReport)

},

.HID_ReportINEndpoint =

{

.Header                 = {.Size = sizeof(USB_Descriptor_Endpoint_t), .Type = DTYPE_Endpoint},

.EndpointAddress        = JOYSTICK_EPADDR,

.Attributes             = (EP_TYPE_INTERRUPT | ENDPOINT_ATTR_NO_SYNC | ENDPOINT_USAGE_DATA),

.EndpointSize           = JOYSTICK_EPSIZE,

.PollingIntervalMS      = 0x04

},

.HID_ReportOUTEndpoint = 

{

.Header                 = {.Size = sizeof(USB_Descriptor_Endpoint_t), .Type = DTYPE_Endpoint},

.EndpointAddress        = JOYSTICK_OUT_EPADDR,

.Attributes             = (EP_TYPE_INTERRUPT | ENDPOINT_ATTR_NO_SYNC | ENDPOINT_USAGE_DATA),

.EndpointSize           = JOYSTICK_EPSIZE,

.PollingIntervalMS      = 0x04

}

};

when using "USB live" I can see the device and on paper it looks OK

ConnectionStatus: DeviceConnected

Current Config Value: 0x01

Device Bus Speed:     Full

Device Address:       0x0D

Open Pipes:              2

Endpoint Descriptor:

bEndpointAddress:     0x81  IN

Transfer Type:   Interrupt

wMaxPacketSize:     0x0008 (8)

bInterval:            0x04

Endpoint Descriptor:

bEndpointAddress:     0x01  OUT

Transfer Type:   Interrupt

wMaxPacketSize:     0x0008 (8)

bInterval:            0x04

Configuration Descriptor:

wTotalLength:       0x0029

bNumInterfaces:       0x01

bConfigurationValue:  0x01

iConfiguration:       0x00

bmAttributes:         0x80 (Bus Powered )

MaxPower:             0x32 (100 Ma)

Interface Descriptor:

bInterfaceNumber:     0x00

bAlternateSetting:    0x00

bNumEndpoints:        0x02

bInterfaceClass:      0x03 (HID)

bInterfaceSubClass:   0x00

bInterfaceProtocol:   0x00

iInterface:           0x00

HID Descriptor:

bcdHID:             0x0111

bCountryCode:         0x00

bNumDescriptors:      0x01

bDescriptorType:      0x22

wDescriptorLength:  0x004B

Endpoint Descriptor:

bEndpointAddress:     0x81  IN

Transfer Type:   Interrupt

wMaxPacketSize:     0x0008 (8)

bInterval:            0x04

However, When I try to actually send data to the device. it seems that windows from some reason sees the device with 0 byte "output" endpoint, and will not send the data I want to send.

Can anyone point me to what I am missing? 

Ive added this chunk to the "HID_task" function

/* Select the Joystick Report Endpoint */

Endpoint_SelectEndpoint(JOYSTICK_OUT_EPADDR);

if (Endpoint_IsOUTReceived()) {

/* Check to see if the packet contains data */

if (Endpoint_IsReadWriteAllowed())

{

processStickOut(Endpoint_Read_8(),Endpoint_Read_16_LE());

}

Endpoint_ClearOUT();

}

Thanks In advance,

Uri

[Bartosz Szymański]

I know it was a long time ago, but did you manage to solve the problem?

[sean]

Honestly I have not found time to drive in to it yet but plan to. 

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