apply @gen2thomas suggestions

apa102/apa102.go

@@ -38,7 +38,7 @@ func New(b drivers.SPI) *Device {
 // NewSoftwareSPI returns a new APA102 driver that will use a software based
 // implementation of the SPI protocol.
 func NewSoftwareSPI(sckPin, sdoPin legacy.PinOutput, delay uint32) *Device {
-	return New(&bbSPI{SCK: sckPin.Set, SDO: sdoPin.Set, Delay: delay, config: func() {
+	return New(&bbSPI{SCK: sckPin.Set, SDO: sdoPin.Set, Delay: delay, configurePins: func() {
 		legacy.ConfigurePinOut(sckPin)
 		legacy.ConfigurePinOut(sdoPin)
 	}})

apa102/softspi.go

@@ -11,18 +11,18 @@ import (
 // most purposes other than the APA102 package. It might be desirable to make
 // this more generic and include it in the TinyGo "machine" package instead.
 type bbSPI struct {
-	SCK    drivers.PinOutput
-	SDO    drivers.PinOutput
-	Delay  uint32
-	config func()
+	SCK           drivers.PinOutput
+	SDO           drivers.PinOutput
+	Delay         uint32
+	configurePins func()
 }
 
 // Configure sets up the SCK and SDO pins as outputs and sets them low
 func (s *bbSPI) Configure() {
-	if s.config == nil {
+	if s.configurePins == nil {
 		panic(legacy.ErrConfigBeforeInstantiated)
 	}
-	s.config()
+	s.configurePins()
 	s.SCK(false)
 	s.SDO(false)
 	if s.Delay == 0 {