up2: correct i2c default bus information to match correct values

Signed-off-by: Ron Evans <ron@hybridgroup.com>

examples/up2_lcd.go

@@ -0,0 +1,49 @@
+// +build example
+//
+// Do not build by default.
+
+package main
+
+import (
+	"time"
+
+	"gobot.io/x/gobot"
+	"gobot.io/x/gobot/drivers/i2c"
+	"gobot.io/x/gobot/platforms/upboard/up2"
+)
+
+func main() {
+	board := up2.NewAdaptor()
+	screen := i2c.NewGroveLcdDriver(board)
+
+	work := func() {
+		screen.Write("hello")
+
+		screen.SetRGB(255, 0, 0)
+
+		gobot.After(5*time.Second, func() {
+			screen.Clear()
+			screen.Home()
+			screen.SetRGB(0, 255, 0)
+			// set a custom character in the first position
+			screen.SetCustomChar(0, i2c.CustomLCDChars["smiley"])
+			// add the custom character at the end of the string
+			screen.Write("goodbye\nhave a nice day " + string(byte(0)))
+			gobot.Every(500*time.Millisecond, func() {
+				screen.Scroll(false)
+			})
+		})
+
+		screen.Home()
+		time.Sleep(1 * time.Second)
+		screen.SetRGB(0, 0, 255)
+	}
+
+	robot := gobot.NewRobot("screenBot",
+		[]gobot.Connection{board},
+		[]gobot.Device{screen},
+		work,
+	)
+
+	robot.Start()
+}

platforms/upboard/up2/adaptor.go

@@ -23,7 +23,7 @@ type Adaptor struct {
 	pinmap             map[string]sysfsPin
 	digitalPins        map[int]*sysfs.DigitalPin
 	pwmPins            map[int]*sysfs.PWMPin
-	i2cBuses           [2]i2c.I2cDevice
+	i2cBuses           [6]i2c.I2cDevice
 	mutex              *sync.Mutex
 	spiDefaultBus      int
 	spiDefaultChip     int
@@ -209,12 +209,12 @@ func (c *Adaptor) PWMPin(pin string) (sysfsPin sysfs.PWMPinner, err error) {
 }
 
 // GetConnection returns a connection to a device on a specified bus.
-// Valid bus number is [0..1] which corresponds to /dev/i2c-0 through /dev/i2c-1.
+// Valid bus number is [5..6] which corresponds to /dev/i2c-5 through /dev/i2c-6.
 func (c *Adaptor) GetConnection(address int, bus int) (connection i2c.Connection, err error) {
 	c.mutex.Lock()
 	defer c.mutex.Unlock()
 
-	if (bus < 0) || (bus > 1) {
+	if (bus < 5) || (bus > 6) {
 		return nil, fmt.Errorf("Bus number %d out of range", bus)
 	}
 	if c.i2cBuses[bus] == nil {
@@ -225,7 +225,7 @@ func (c *Adaptor) GetConnection(address int, bus int) (connection i2c.Connection
 
 // GetDefaultBus returns the default i2c bus for this platform
 func (c *Adaptor) GetDefaultBus() int {
-	return 0
+	return 5
 }
 
 // GetSpiConnection returns an spi connection to a device on a specified bus.

platforms/upboard/up2/adaptor_test.go

@@ -86,12 +86,12 @@ func TestAdaptorDigitalReadWriteError(t *testing.T) {
 func TestUP2AdaptorI2c(t *testing.T) {
 	a := NewAdaptor()
 	fs := sysfs.NewMockFilesystem([]string{
-		"/dev/i2c-0",
+		"/dev/i2c-5",
 	})
 	sysfs.SetFilesystem(fs)
 	sysfs.SetSyscall(&sysfs.MockSyscall{})
 
-	con, err := a.GetConnection(0xff, 0)
+	con, err := a.GetConnection(0xff, 5)
 	gobottest.Assert(t, err, nil)
 
 	con.Write([]byte{0x00, 0x01})
@@ -175,7 +175,7 @@ func TestUP2AdaptorPwmReadError(t *testing.T) {
 
 func TestUP2I2CDefaultBus(t *testing.T) {
 	a, _ := initTestUP2Adaptor()
-	gobottest.Assert(t, a.GetDefaultBus(), 0)
+	gobottest.Assert(t, a.GetDefaultBus(), 5)
 }
 
 func TestUP2GetConnectionInvalidBus(t *testing.T) {