remove last traces of legacy I2C calls

examples/apds9960/proximity/main.go

@@ -8,33 +8,42 @@ import (
 )
 
 func main() {
-
+	// Sleep to catch any errors through the serial monitor.
+	time.Sleep(1000 * time.Millisecond)
+	bus := machine.I2C0
 	// use Nano 33 BLE Sense's internal I2C bus
-	machine.I2C1.Configure(machine.I2CConfig{
-		SCL:       machine.SCL1_PIN,
-		SDA:       machine.SDA1_PIN,
-		Frequency: machine.TWI_FREQ_400KHZ,
+	err := bus.Configure(machine.I2CConfig{
+		SCL:       machine.GP1,
+		SDA:       machine.GP0,
+		Frequency: 400 * machine.KHz,
 	})
+	if err != nil {
+		panic(err.Error())
+	}
 
-	sensor := apds9960.New(machine.I2C1)
+	sensor := apds9960.New(bus)
 
 	// use default settings
 	sensor.Configure(apds9960.Configuration{})
 
 	if !sensor.Connected() {
 		println("APDS-9960 not connected!")
+		println("err:", sensor.Err())
 		return
 	}
-
-	sensor.EnableProximity() // enable proximity engine
-
+	println("APDS connected!")
+	err = sensor.EnableProximity() // enable proximity engine
+	if err != nil {
+		panic(err.Error())
+	}
 	for {
-
 		if sensor.ProximityAvailable() {
 			p := sensor.ReadProximity()
 			println("Proximity:", p)
 		}
+		if err := sensor.Err(); err != nil {
+			println(err.Error())
+		}
 		time.Sleep(time.Millisecond * 100)
 	}
-
 }