wifinina: control nina pins, for example leds

wifinina/pins.go

@@ -0,0 +1,65 @@
+package wifinina
+
+import "errors"
+
+// Mimics machine package's pin control
+//
+// NB! These are NINA chip pins, not main unit pins.
+//
+// Digital pin values and modes taken from
+// https://github.com/arduino/nina-fw/blob/master/arduino/cores/esp32/wiring_digital.h
+
+type Pin uint8
+
+const (
+	PinLow uint8 = iota
+	PinHigh
+)
+
+type PinMode uint8
+
+const (
+	PinInput PinMode = iota
+	PinOutput
+	PinInputPullup
+)
+
+type PinConfig struct {
+	Mode PinMode
+}
+
+var (
+	ErrPinNoDevice = errors.New("wifinina pin: device not set")
+)
+
+var pinDevice *Device
+
+func pinUseDevice(d *Device) {
+	pinDevice = d
+}
+
+func (p Pin) Configure(config PinConfig) error {
+	if pinDevice == nil {
+		return ErrPinNoDevice
+	}
+	return pinDevice.PinMode(uint8(p), uint8(config.Mode))
+}
+
+func (p Pin) Set(high bool) error {
+	if pinDevice == nil {
+		return ErrPinNoDevice
+	}
+	value := PinLow
+	if high {
+		value = PinHigh
+	}
+	return pinDevice.DigitalWrite(uint8(p), value)
+}
+
+func (p Pin) High() error {
+	return p.Set(true)
+}
+
+func (p Pin) Low() error {
+	return p.Set(false)
+}