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direct_pin_driver.go
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direct_pin_driver.go
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package gpio
import (
"strconv"
"github.com/hybridgroup/gobot"
)
// DirectPinDriver represents a GPIO pin
type DirectPinDriver struct {
name string
pin string
connection gobot.Connection
gobot.Commander
}
// NewDirectPinDriver return a new DirectPinDriver given a Connection, name and pin.
//
// Adds the following API Commands:
// "DigitalRead" - See DirectPinDriver.DigitalRead
// "DigitalWrite" - See DirectPinDriver.DigitalWrite
// "AnalogRead" - See DirectPinDriver.AnalogRead
// "AnalogWrite" - See DirectPinDriver.AnalogWrite
// "PwmWrite" - See DirectPinDriver.PwmWrite
// "ServoWrite" - See DirectPinDriver.ServoWrite
func NewDirectPinDriver(a gobot.Connection, name string, pin string) *DirectPinDriver {
d := &DirectPinDriver{
name: name,
connection: a,
pin: pin,
Commander: gobot.NewCommander(),
}
d.AddCommand("DigitalRead", func(params map[string]interface{}) interface{} {
val, err := d.DigitalRead()
return map[string]interface{}{"val": val, "err": err}
})
d.AddCommand("DigitalWrite", func(params map[string]interface{}) interface{} {
level, _ := strconv.Atoi(params["level"].(string))
return d.DigitalWrite(byte(level))
})
d.AddCommand("AnalogRead", func(params map[string]interface{}) interface{} {
val, err := d.AnalogRead()
return map[string]interface{}{"val": val, "err": err}
})
d.AddCommand("PwmWrite", func(params map[string]interface{}) interface{} {
level, _ := strconv.Atoi(params["level"].(string))
return d.PwmWrite(byte(level))
})
d.AddCommand("ServoWrite", func(params map[string]interface{}) interface{} {
level, _ := strconv.Atoi(params["level"].(string))
return d.ServoWrite(byte(level))
})
return d
}
// Name returns the DirectPinDrivers name
func (d *DirectPinDriver) Name() string { return d.name }
// Pin returns the DirectPinDrivers pin
func (d *DirectPinDriver) Pin() string { return d.pin }
// Connection returns the DirectPinDrivers Connection
func (d *DirectPinDriver) Connection() gobot.Connection { return d.connection }
// Start implements the Driver interface
func (d *DirectPinDriver) Start() (errs []error) { return }
// Halt implements the Driver interface
func (d *DirectPinDriver) Halt() (errs []error) { return }
// Turn Off pin
func (d *DirectPinDriver) Off() (err error) {
if writer, ok := d.Connection().(DigitalWriter); ok {
return writer.DigitalWrite(d.Pin(), byte(0))
}
err = ErrDigitalWriteUnsupported
return
}
// Turn On pin
func (d *DirectPinDriver) On() (err error) {
if writer, ok := d.Connection().(DigitalWriter); ok {
return writer.DigitalWrite(d.Pin(), byte(1))
}
err = ErrDigitalWriteUnsupported
return
}
// DigitalRead returns the current digital state of the pin
func (d *DirectPinDriver) DigitalRead() (val int, err error) {
if reader, ok := d.Connection().(DigitalReader); ok {
return reader.DigitalRead(d.Pin())
}
err = ErrDigitalReadUnsupported
return
}
// DigitalWrite writes to the pin. Acceptable values are 1 or 0
func (d *DirectPinDriver) DigitalWrite(level byte) (err error) {
if writer, ok := d.Connection().(DigitalWriter); ok {
return writer.DigitalWrite(d.Pin(), level)
}
err = ErrDigitalWriteUnsupported
return
}
// AnalogRead reads the current analog reading of the pin
func (d *DirectPinDriver) AnalogRead() (val int, err error) {
if reader, ok := d.Connection().(AnalogReader); ok {
return reader.AnalogRead(d.Pin())
}
err = ErrAnalogReadUnsupported
return
}
// PwmWrite writes the 0-254 value to the specified pin
func (d *DirectPinDriver) PwmWrite(level byte) (err error) {
if writer, ok := d.Connection().(PwmWriter); ok {
return writer.PwmWrite(d.Pin(), level)
}
err = ErrPwmWriteUnsupported
return
}
// ServoWrite writes value to the specified pin
func (d *DirectPinDriver) ServoWrite(level byte) (err error) {
if writer, ok := d.Connection().(ServoWriter); ok {
return writer.ServoWrite(d.Pin(), level)
}
err = ErrServoWriteUnsupported
return
}