Refactor display options in ssd1306.go (#77)

ssd1306/ssd1306.go

@@ -84,11 +84,13 @@ const (
 
 // DefaultOpts is the recommended default options.
 var DefaultOpts = Opts{
-	W:             128,
-	H:             64,
-	Rotated:       false,
-	Sequential:    false,
-	SwapTopBottom: false,
+	W:                128,
+	H:                64,
+	Rotated:          false,
+	MirrorVertical:   false,
+	MirrorHorizontal: false,
+	Sequential:       false,
+	SwapTopBottom:    false,
 }
 
 // Opts defines the options for the device.
@@ -96,11 +98,21 @@ type Opts struct {
 	W int
 	H int
 	// Rotated determines if the display is rotated by 180°.
+	//
+	// Deprecated: Use MirrorVertical and MirrorHorizontal instead.
 	Rotated bool
 	// Sequential corresponds to the Sequential/Alternative COM pin configuration
 	// in the OLED panel hardware. Try toggling this if half the rows appear to be
 	// missing on your display.
 	Sequential bool
+	// MirrorVertical corresponds to the COM remap configuration in the OLED panel
+	// hardware. Try toggling this if the display is flipped vertically.
+	// Overwrites Rotated.
+	MirrorVertical bool
+	// MirrorHorizontal corresponds to the SEG remap configuration in the OLED panel
+	// hardware. Try toggling this if the display is flipped horizontally.
+	// Overwrites Rotated.
+	MirrorHorizontal bool
 	// SwapTopBottom corresponds to the Left/Right remap COM pin configuration in
 	// the OLED panel hardware. Try toggling this if the top and bottom halves of
 	// your display are swapped.
@@ -354,6 +366,12 @@ func getInitCmd(opts *Opts) []byte {
 		comScan = 0xC0
 		columnAddr = byte(0xA0)
 	}
+	if opts.MirrorVertical {
+		comScan = byte(0xC0)
+	}
+	if opts.MirrorHorizontal {
+		columnAddr = byte(0xA0)
+	}
 	// See page 40.
 	hwLayout := byte(0x02)
 	if !opts.Sequential {

ssd1306/ssd1306_test.go

@@ -29,7 +29,7 @@ func TestNewI2C_fail(t *testing.T) {
 	if d, err := NewI2C(&bus, &Opts{W: 64}); d != nil || err == nil {
 		t.Fatal(d, err)
 	}
-	if d, err := NewI2C(&bus, &Opts{W: 64, H: 64, Rotated: true}); d != nil || err == nil {
+	if d, err := NewI2C(&bus, &Opts{W: 64, H: 64, MirrorVertical: true, MirrorHorizontal: true}); d != nil || err == nil {
 		t.Fatal(d, err)
 	}
 	if err := bus.Close(); err != nil {
@@ -491,7 +491,7 @@ func TestSPI_3wire(t *testing.T) {
 func TestSPI_4wire_String(t *testing.T) {
 	port := spitest.Playback{
 		Playback: conntest.Playback{
-			Ops: []conntest.IO{{W: getInitCmd(&Opts{W: 128, H: 64, Rotated: false})}},
+			Ops: []conntest.IO{{W: getInitCmd(&Opts{W: 128, H: 64, MirrorVertical: false, MirrorHorizontal: false})}},
 		},
 	}
 	dev, err := NewSPI(&port, &gpiotest.Pin{N: "pin1", Num: 42}, &DefaultOpts)
@@ -516,7 +516,7 @@ func TestSPI_4wire_Write_differential(t *testing.T) {
 	port := spitest.Playback{
 		Playback: conntest.Playback{
 			Ops: []conntest.IO{
-				{W: getInitCmd(&Opts{W: 128, H: 64, Rotated: false})},
+				{W: getInitCmd(&Opts{W: 128, H: 64, MirrorVertical: false, MirrorHorizontal: false})},
 
 				// Page 1
 				{W: []byte{0xB0, 0x00, 0x10}},
@@ -573,7 +573,7 @@ func TestSPI_4wire_Write_differential_fail(t *testing.T) {
 	port := spitest.Playback{
 		Playback: conntest.Playback{
 			Ops: []conntest.IO{
-				{W: getInitCmd(&Opts{W: 128, H: 64, Rotated: false})},
+				{W: getInitCmd(&Opts{W: 128, H: 64, MirrorVertical: false, MirrorHorizontal: false})},
 				// Page 1
 				{W: []byte{0xB0, 0x00, 0x10}},
 				{W: buf1},
@@ -623,7 +623,7 @@ func TestSPI_4wire_Write_differential_fail(t *testing.T) {
 func TestSPI_4wire_gpio_fail(t *testing.T) {
 	port := spitest.Playback{
 		Playback: conntest.Playback{
-			Ops: []conntest.IO{{W: getInitCmd(&Opts{W: 128, H: 64, Rotated: false})}},
+			Ops: []conntest.IO{{W: getInitCmd(&Opts{W: 128, H: 64, MirrorVertical: false, MirrorHorizontal: false})}},
 		},
 	}
 	pin := &failPin{fail: false}
@@ -666,7 +666,7 @@ func TestInitCmd(t *testing.T) {
 //
 
 func initCmdI2C() []byte {
-	return append([]byte{0}, getInitCmd(&Opts{W: 128, H: 64, Rotated: false})...)
+	return append([]byte{0}, getInitCmd(&Opts{W: 128, H: 64, MirrorVertical: false, MirrorHorizontal: false})...)
 }
 
 func getI2CPlayback() *i2ctest.Playback {

ssd1306/ssd1306smoketest/ssd1306smoketest.go

@@ -94,7 +94,11 @@ func (s *SmokeTest) Run(f *flag.FlagSet, args []string) (err error) {
 	if len(*dcName) != 0 {
 		dc = gpioreg.ByName(*dcName)
 	}
-	opts := ssd1306.Opts{W: *w, H: *h, Rotated: *rotated}
+	opts := ssd1306.Opts{W: *w, H: *h}
+	if *rotated {
+		opts.MirrorHorizontal = true
+		opts.MirrorVertical = true
+	}
 	if !*record {
 		return s.run(i2cBus, spiPort, dc, &opts)
 	}