Add Device.OutEndpoint, simplify endpoint test.

usb/device.go

@@ -182,6 +182,7 @@ func (d *Device) openEndpoint(cfgNum, ifNum, setNum, epAddr uint8) (*endpoint, e
 	return end, nil
 }
 
+// InEndpoint prepares an IN endpoint for transfer.
 func (d *Device) InEndpoint(cfgNum, ifNum, setNum, epNum uint8) (*InEndpoint, error) {
 	ep, err := d.openEndpoint(cfgNum, ifNum, setNum, endpointAddr(epNum, EndpointDirectionIn))
 	if err != nil {
@@ -193,6 +194,18 @@ func (d *Device) InEndpoint(cfgNum, ifNum, setNum, epNum uint8) (*InEndpoint, er
 	}, nil
 }
 
+// OutEndpoint prepares an OUT endpoint for transfer.
+func (d *Device) OutEndpoint(cfgNum, ifNum, setNum, epNum uint8) (*OutEndpoint, error) {
+	ep, err := d.openEndpoint(cfgNum, ifNum, setNum, endpointAddr(epNum, EndpointDirectionOut))
+	if err != nil {
+		return nil, err
+	}
+	return &OutEndpoint{
+		endpoint: ep,
+		timeout:  d.WriteTimeout,
+	}, nil
+}
+
 // GetStringDescriptor returns a device string descriptor with the given index
 // number. The first supported language is always used and the returned
 // descriptor string is converted to ASCII (non-ASCII characters are replaced

usb/endpoint.go

@@ -110,7 +110,7 @@ func newEndpoint(h *libusbDevHandle, s InterfaceSetting, e EndpointInfo) *endpoi
 	}
 }
 
-// OutEndpoint represents an IN endpoint open for transfer.
+// InEndpoint represents an IN endpoint open for transfer.
 type InEndpoint struct {
 	*endpoint
 	timeout time.Duration

usb/endpoint_test.go

@@ -19,85 +19,88 @@ import (
 	"time"
 )
 
-// IN bulk endpoint
-var testBulkInEP = EndpointInfo{
-	Number:        2,
-	Direction:     EndpointDirectionIn,
-	MaxPacketSize: 512,
-	TransferType:  TransferTypeBulk,
-}
-
-var testBulkInSetting = InterfaceSetting{
-	Number:    0,
-	Alternate: 0,
-	Class:     ClassVendorSpec,
-	Endpoints: []EndpointInfo{testBulkInEP},
-}
-
-// OUT iso endpoint
-var testIsoOutEP = EndpointInfo{
-	Number:        6,
-	MaxPacketSize: 3 * 1024,
-	TransferType:  TransferTypeIsochronous,
-	PollInterval:  125 * time.Microsecond,
-	UsageType:     IsoUsageTypeData,
-}
-
-var testIsoOutSetting = InterfaceSetting{
-	Number:    0,
-	Alternate: 0,
-	Class:     ClassVendorSpec,
-	Endpoints: []EndpointInfo{testIsoOutEP},
-}
-
-func TestInEndpoint(t *testing.T) {
+func TestEndpoint(t *testing.T) {
 	defer func(i libusbIntf) { libusb = i }(libusb)
-	for _, tc := range []struct {
-		desc    string
-		buf     []byte
-		ret     int
-		status  TransferStatus
-		want    int
-		wantErr bool
+	for _, epData := range []struct {
+		ei   EndpointInfo
+		intf InterfaceSetting
 	}{
 		{
-			desc: "empty buffer",
-			buf:  nil,
-			ret:  10,
-			want: 0,
+			ei: EndpointInfo{
+				Number:        2,
+				Direction:     EndpointDirectionIn,
+				MaxPacketSize: 512,
+				TransferType:  TransferTypeBulk,
+			},
+			intf: InterfaceSetting{
+				Number:    0,
+				Alternate: 0,
+				Class:     ClassVendorSpec,
+			},
 		},
 		{
-			desc: "128B buffer, 60 transferred",
-			buf:  make([]byte, 128),
-			ret:  60,
-			want: 60,
-		},
-		{
-			desc:    "128B buffer, 10 transferred and then error",
-			buf:     make([]byte, 128),
-			ret:     10,
-			status:  TransferError,
-			want:    10,
-			wantErr: true,
+			ei: EndpointInfo{
+				Number:        6,
+				MaxPacketSize: 3 * 1024,
+				TransferType:  TransferTypeIsochronous,
+				PollInterval:  125 * time.Microsecond,
+				UsageType:     IsoUsageTypeData,
+			},
+			intf: InterfaceSetting{
+				Number:    0,
+				Alternate: 0,
+				Class:     ClassVendorSpec,
+			},
 		},
 	} {
-		lib := newFakeLibusb()
-		libusb = lib
+		epData.intf.Endpoints = []EndpointInfo{epData.ei}
+		for _, tc := range []struct {
+			desc    string
+			buf     []byte
+			ret     int
+			status  TransferStatus
+			want    int
+			wantErr bool
+		}{
+			{
+				desc: "empty buffer",
+				buf:  nil,
+				ret:  10,
+				want: 0,
+			},
+			{
+				desc: "128B buffer, 60 transferred",
+				buf:  make([]byte, 128),
+				ret:  60,
+				want: 60,
+			},
+			{
+				desc:    "128B buffer, 10 transferred and then error",
+				buf:     make([]byte, 128),
+				ret:     10,
+				status:  TransferError,
+				want:    10,
+				wantErr: true,
+			},
+		} {
+			lib := newFakeLibusb()
+			libusb = lib
 
-		ep := InEndpoint{newEndpoint(nil, testBulkInSetting, testBulkInEP), time.Second}
-		go func() {
-			fakeT := lib.waitForSubmitted()
-			fakeT.length = tc.ret
-			fakeT.status = tc.status
-			close(fakeT.done)
-		}()
-		got, err := ep.Read(tc.buf)
-		if (err != nil) != tc.wantErr {
-			t.Errorf("%s: bulkInEP.Read(): got err: %v, err != nil is %v, want %v", tc.desc, err, err != nil, tc.wantErr)
-			continue
-		}
-		if got != tc.want {
-			t.Errorf("%s: bulkInEP.Read(): got %d bytes, want %d", tc.desc, got, tc.want)
+			ep := newEndpoint(nil, epData.intf, epData.ei)
+			go func() {
+				fakeT := lib.waitForSubmitted()
+				fakeT.length = tc.ret
+				fakeT.status = tc.status
+				close(fakeT.done)
+			}()
+			got, err := ep.transfer(tc.buf, time.Second)
+			if (err != nil) != tc.wantErr {
+				t.Errorf("%s, %s: ep.transfer(...): got err: %v, err != nil is %v, want %v", epData.ei, tc.desc, err, err != nil, tc.wantErr)
+				continue
+			}
+			if got != tc.want {
+				t.Errorf("%s, %s: ep.transfer(...): got %d bytes, want %d", epData.ei, tc.desc, got, tc.want)
+			}
 		}
 	}
 }