Cleanups

hd44780/af_i2c_backpack.go

@@ -40,10 +40,9 @@ func NewAdafruitI2CBackpack(bus i2c.Bus, address uint16, rows, cols int) (*HD447
 		return nil, err
 	}
 	gr := *mcp.Group(0, []int{d4, d5, d6, d7, rsPin, enablePin, backlightPin})
-	grPins := gr.Pins()
-	reset := grPins[4].(gpio.PinOut)
-	enable := grPins[5].(gpio.PinOut)
-	bl := grPins[6].(gpio.PinOut)
+	reset, _ := gr.ByOffset(4).(gpio.PinOut)
+	enable, _ := gr.ByOffset(5).(gpio.PinOut)
+	bl := gr.ByOffset(6).(gpio.PinOut)
 	return NewHD44780(gr, &reset, &enable, &bl, rows, cols)
 }
 
@@ -53,9 +52,9 @@ func NewAdafruitSPIBackpack(conn spi.Conn, rows, cols int) (*HD44780, error) {
 	chip := nxp74hc595.New(conn)
 	// The SPI side has the same pins but in reverse order from the I2C side.
 	gr, _ := chip.Group(d7, d6, d5, d4)
-	rs := chip.Pins[rsPin]
-	e := chip.Pins[enablePin]
-	bt := dev.Pins[backlightPin]
+	rs := &chip.Pins[rsPin]
+	e := &chip.Pins[enablePin]
+	bt := &chip.Pins[backlightPin]
 
-	return hd44780.NewHD44780(gr, &rs, &e, &bt, rows, cols)
+	return NewHD44780(gr, rs, e, bt, rows, cols)
 }

hd44780/example_test.go

@@ -99,7 +99,6 @@ func ExampleNewAdafruitI2CBackpack() {
 	_ = displaytest.TestTextDisplay(dev, true)
 }
 
-
 func ExampleNewAdafruitSPIBackpack() {
 	if _, err := host.Init(); err != nil {
 		log.Fatal(err)
@@ -122,7 +121,7 @@ func ExampleNewAdafruitSPIBackpack() {
 	_ = display.Clear()
 	_, _ = display.WriteString("Hello")
 	time.Sleep(5 * time.Second)
-	_ = displaytest.TestTextDisplay(lcd, true)
+	_ = displaytest.TestTextDisplay(display, true)
 }
 
 func ExampleNewPCF857xBackpack() {