Add support for HID Keyboard LEDs

src/machine/usb/descriptor/hid.go

@@ -26,7 +26,7 @@ var interfaceHID = [interfaceTypeLen]byte{
 	TypeInterface,
 	0x02, // InterfaceNumber
 	0x00, // AlternateSetting
-	0x01, // NumEndpoints
+	0x02, // NumEndpoints
 	0x03, // InterfaceClass
 	0x00, // InterfaceSubClass
 	0x00, // InterfaceProtocol
@@ -103,7 +103,7 @@ var classHID = [ClassHIDTypeLen]byte{
 	0x00, // CountryCode
 	0x01, // NumDescriptors
 	0x22, // ClassType
-	0x7E, // ClassLength L
+	0x90, // ClassLength L
 	0x00, // ClassLength H
 }
 
@@ -128,6 +128,7 @@ var CDCHID = Descriptor{
 		InterfaceHID.Bytes(),
 		ClassHID.Bytes(),
 		EndpointEP4IN.Bytes(),
+		EndpointEP5OUT.Bytes(),
 	}),
 	HID: map[uint16][]byte{
 		2: Append([][]byte{
@@ -147,6 +148,15 @@ var CDCHID = Descriptor{
 			HIDReportCount(1),
 			HIDReportSize(8),
 			HIDInputConstVarAbs,
+			HIDReportCount(3),
+			HIDReportSize(1),
+			HIDUsagePageLED,
+			HIDUsageMinimum(1),
+			HIDUsageMaximum(3),
+			HIDOutputDataVarAbs,
+			HIDReportCount(5),
+			HIDReportSize(1),
+			HIDOutputConstVarAbs,
 			HIDReportCount(6),
 			HIDReportSize(8),
 			HIDLogicalMinimum(0),

src/machine/usb/descriptor/hidreport.go

@@ -13,6 +13,7 @@ const (
 	hidUnit            = 0x65
 	hidCollection      = 0xa1
 	hidInput           = 0x81
+	hidOutput          = 0x91
 	hidReportSize      = 0x75
 	hidReportCount     = 0x95
 	hidReportID        = 0x85
@@ -121,6 +122,12 @@ var (
 
 	// Input (Data, Variable, Relative), 2 position bytes (X & Y)
 	HIDInputDataVarRel = []byte{hidInput, 0x06}
+
+	// Output (Data, Variable, Absolute), Modifier byte
+	HIDOutputDataVarAbs = []byte{hidOutput, 0x02}
+
+	// Output (Const, Variable, Absolute), Modifier byte
+	HIDOutputConstVarAbs = []byte{hidOutput, 0x03}
 )
 
 func HIDReportSize(size int) []byte {