diff --git a/README.md b/README.md index c7b580df..6f14e6b2 100644 --- a/README.md +++ b/README.md @@ -231,6 +231,7 @@ a shared set of drivers provided using the `gobot/drivers/gpio` package: - Button - Buzzer - Direct Pin + - EasyDriver - Grove Button - Grove Buzzer - Grove LED diff --git a/drivers/gpio/easy_driver.go b/drivers/gpio/easy_driver.go new file mode 100644 index 00000000..e77ec37a --- /dev/null +++ b/drivers/gpio/easy_driver.go @@ -0,0 +1,281 @@ +package gpio + +import ( + "errors" + "strconv" + "time" + + "gobot.io/x/gobot" +) + +// EasyDriver object +type EasyDriver struct { + gobot.Commander + + name string + connection DigitalWriter + stepPin string + dirPin string + enPin string + sleepPin string + + angle float32 + rpm uint + dir int8 + moving bool + stepNum int + enabled bool + sleeping bool +} + +// NewEasyDriver returns a new EasyDriver from SparkFun (https://www.sparkfun.com/products/12779) +// TODO: Support selecting phase input instead of hard-wiring MS1 and MS2 to board truth table +// This should also work for the BigEasyDriver (untested) +// A - DigitalWriter +// stepPin - Pin corresponding to step input on EasyDriver +// dirPin - Pin corresponding to dir input on EasyDriver. Optional +// enPin - Pin corresponding to enabled input on EasyDriver. Optional +// sleepPin - Pin corresponding to sleep input on EasyDriver. Optional +// angle - Step angle of motor +func NewEasyDriver(a DigitalWriter, angle float32, stepPin string, dirPin string, enPin string, sleepPin string) *EasyDriver { + d := &EasyDriver{ + Commander: gobot.NewCommander(), + name: gobot.DefaultName("EasyDriver"), + connection: a, + stepPin: stepPin, + dirPin: dirPin, + enPin: enPin, + sleepPin: sleepPin, + + angle: angle, + rpm: 1, + dir: 1, + enabled: true, + sleeping: false, + } + + // panic if step pin isn't set + if stepPin == "" { + panic("Step pin is not set") + } + + // 1/4 of max speed. Not too fast, not too slow + d.rpm = d.GetMaxSpeed() / 4 + + d.AddCommand("Move", func(params map[string]interface{}) interface{} { + degs, _ := strconv.Atoi(params["degs"].(string)) + return d.Move(degs) + }) + d.AddCommand("Step", func(params map[string]interface{}) interface{} { + return d.Step() + }) + d.AddCommand("Run", func(params map[string]interface{}) interface{} { + return d.Run() + }) + d.AddCommand("Stop", func(params map[string]interface{}) interface{} { + return d.Stop() + }) + + return d +} + +// Name of EasyDriver +func (d *EasyDriver) Name() string { return d.name } + +// SetName sets name for EasyDriver +func (d *EasyDriver) SetName(n string) { d.name = n } + +// Connection returns EasyDriver's connection +func (d *EasyDriver) Connection() gobot.Connection { return d.connection.(gobot.Connection) } + +// Start implements the Driver interface +func (d *EasyDriver) Start() (err error) { return } + +// Halt implements the Driver interface; stops running the stepper +func (d *EasyDriver) Halt() (err error) { + d.Stop() + return +} + +// Move the motor given number of degrees at current speed. +func (d *EasyDriver) Move(degs int) (err error) { + if d.moving { + // don't do anything if already moving + return + } + + d.moving = true + + steps := int(float32(degs) / d.angle) + for i := 0; i < steps; i++ { + if !d.moving { + // don't continue to step if driver is stopped + break + } + + d.Step() + } + + d.moving = false + + return +} + +// Step the stepper 1 step +func (d *EasyDriver) Step() (err error) { + stepsPerRev := d.GetMaxSpeed() + + // a valid steps occurs for a low to high transition + d.connection.DigitalWrite(d.stepPin, 0) + // 1 minute / steps per revolution / revolutions per minute + // let's keep it as Microseconds so we only have to do integer math + time.Sleep(time.Duration(60*1000*1000/stepsPerRev/d.rpm) * time.Microsecond) + d.connection.DigitalWrite(d.stepPin, 1) + + // increment or decrement the number of steps by 1 + d.stepNum += int(d.dir) + + return +} + +// Run the stepper continuously +func (d *EasyDriver) Run() (err error) { + if d.moving { + // don't do anything if already moving + return + } + + d.moving = true + + go func() { + for d.moving { + d.Step() + } + }() + + return +} + +// Stop running the stepper +func (d *EasyDriver) Stop() (err error) { + d.moving = false + return +} + +// SetDirection sets the direction to be moving. Valid directions are "cw" or "ccw" +func (d *EasyDriver) SetDirection(dir string) (err error) { + // can't change direct if dirPin isn't set + if d.dirPin == "" { + return errors.New("dirPin is not set") + } + + if dir == "ccw" { + d.dir = -1 + d.connection.DigitalWrite(d.dirPin, 1) // high is ccw + } else { // default to cw, even if user specified wrong value + d.dir = 1 + d.connection.DigitalWrite(d.dirPin, 0) // low is cw + } + + return +} + +// SetSpeed sets the speed of the motor in RPMs. 1 is the lowest and GetMaxSpeed is the highest +func (d *EasyDriver) SetSpeed(rpm uint) (err error) { + if rpm < 1 { + d.rpm = 1 + } else if rpm > d.GetMaxSpeed() { + d.rpm = d.GetMaxSpeed() + } else { + d.rpm = rpm + } + + return +} + +// GetMaxSpeed returns the max speed of the stepper +func (d *EasyDriver) GetMaxSpeed() uint { + return uint(360 / d.angle) +} + +// GetCurrentStep returns current step number +func (d *EasyDriver) GetCurrentStep() int { + return d.stepNum +} + +// IsMoving returns a bool stating whether motor is currently in motion +func (d *EasyDriver) IsMoving() bool { + return d.moving +} + +// Enable enables all motor output +func (d *EasyDriver) Enable() (err error) { + // can't enable if enPin isn't set. This is fine normally since it will be enabled by default + if d.enPin == "" { + return errors.New("enPin is not set. Board is enabled by default") + } + + d.enabled = true + d.connection.DigitalWrite(d.enPin, 0) // enPin is active low + + return +} + +// Disable disables all motor output +func (d *EasyDriver) Disable() (err error) { + // can't disable if enPin isn't set + if d.enPin == "" { + return errors.New("enPin is not set") + } + + // let's stop the motor first + d.Stop() + + d.enabled = false + d.connection.DigitalWrite(d.enPin, 1) // enPin is active low + + return +} + +// IsEnabled returns a bool stating whether motor is enabled +func (d *EasyDriver) IsEnabled() bool { + return d.enabled +} + +// Sleep puts the driver to sleep and disables all motor output. Low power mode. +func (d *EasyDriver) Sleep() (err error) { + // can't sleep if sleepPin isn't set + if d.sleepPin == "" { + return errors.New("sleepPin is not set") + } + + // let's stop the motor first + d.Stop() + + d.sleeping = true + d.connection.DigitalWrite(d.sleepPin, 0) // sleepPin is active low + + return +} + +// Wake wakes up the driver +func (d *EasyDriver) Wake() (err error) { + // can't wake if sleepPin isn't set + if d.sleepPin == "" { + return errors.New("sleepPin is not set") + } + + d.sleeping = false + d.connection.DigitalWrite(d.sleepPin, 1) // sleepPin is active low + + // we need to wait 1ms after sleeping before doing a step to charge the step pump (according to data sheet) + // this will ensure that happens + time.Sleep(1 * time.Millisecond) + + return +} + +// IsSleeping returns a bool stating whether motor is enabled +func (d *EasyDriver) IsSleeping() bool { + return d.sleeping +} diff --git a/drivers/gpio/easy_driver_test.go b/drivers/gpio/easy_driver_test.go new file mode 100644 index 00000000..825c398e --- /dev/null +++ b/drivers/gpio/easy_driver_test.go @@ -0,0 +1,138 @@ +package gpio + +import ( + "gobot.io/x/gobot/gobottest" + "strings" + "testing" + "time" +) + +const ( + stepAngle = 0.5 // use non int step angle to check int math + stepsPerRev = 720 +) + +func initEasyDriver() *EasyDriver { + return NewEasyDriver(newGpioTestAdaptor(), stepAngle, "1", "2", "3", "4") +} + +func TestEasyDriverDefaultName(t *testing.T) { + d := initEasyDriver() + gobottest.Assert(t, strings.HasPrefix(d.Name(), "EasyDriver"), true) +} + +func TestEasyDriverSetName(t *testing.T) { + d := initEasyDriver() + d.SetName("OtherDriver") + gobottest.Assert(t, strings.HasPrefix(d.Name(), "OtherDriver"), true) +} + +func TestEasyDriverMove(t *testing.T) { + d := initEasyDriver() + d.Move(2) + time.Sleep(2 * time.Millisecond) + gobottest.Assert(t, d.GetCurrentStep(), 4) + gobottest.Assert(t, d.IsMoving(), false) +} + +func TestEasyDriverRun(t *testing.T) { + d := initEasyDriver() + d.Run() + gobottest.Assert(t, d.IsMoving(), true) + d.Run() + gobottest.Assert(t, d.IsMoving(), true) +} + +func TestEasyDriverStop(t *testing.T) { + d := initEasyDriver() + d.Run() + gobottest.Assert(t, d.IsMoving(), true) + d.Stop() + gobottest.Assert(t, d.IsMoving(), false) +} + +func TestEasyDriverStep(t *testing.T) { + d := initEasyDriver() + d.Step() + gobottest.Assert(t, d.GetCurrentStep(), 1) + d.Step() + d.Step() + d.Step() + gobottest.Assert(t, d.GetCurrentStep(), 4) + d.SetDirection("ccw") + d.Step() + gobottest.Assert(t, d.GetCurrentStep(), 3) +} + +func TestEasyDriverSetDirection(t *testing.T) { + d := initEasyDriver() + gobottest.Assert(t, d.dir, int8(1)) + d.SetDirection("cw") + gobottest.Assert(t, d.dir, int8(1)) + d.SetDirection("ccw") + gobottest.Assert(t, d.dir, int8(-1)) + d.SetDirection("nothing") + gobottest.Assert(t, d.dir, int8(1)) +} + +func TestEasyDriverSetSpeed(t *testing.T) { + d := initEasyDriver() + gobottest.Assert(t, d.rpm, uint(stepsPerRev/4)) // default speed of 720/4 + d.SetSpeed(0) + gobottest.Assert(t, d.rpm, uint(1)) + d.SetSpeed(200) + gobottest.Assert(t, d.rpm, uint(200)) + d.SetSpeed(1000) + gobottest.Assert(t, d.rpm, uint(stepsPerRev)) +} + +func TestEasyDriverGetMaxSpeed(t *testing.T) { + d := initEasyDriver() + gobottest.Assert(t, d.GetMaxSpeed(), uint(stepsPerRev)) +} + +func TestEasyDriverSleep(t *testing.T) { + // let's test basic functionality + d := initEasyDriver() + d.Sleep() + gobottest.Assert(t, d.IsSleeping(), true) + + // let's make sure it stops first + d = initEasyDriver() + d.Run() + d.Sleep() + gobottest.Assert(t, d.IsSleeping(), true) + gobottest.Assert(t, d.IsMoving(), false) +} + +func TestEasyDriverWake(t *testing.T) { + // let's test basic functionality + d := initEasyDriver() + d.Sleep() + gobottest.Assert(t, d.IsSleeping(), true) + d.Wake() + gobottest.Assert(t, d.IsSleeping(), false) +} + +func TestEasyDriverDisable(t *testing.T) { + // let's test basic functionality + d := initEasyDriver() + d.Disable() + gobottest.Assert(t, d.IsEnabled(), false) + + // let's make sure it stops first + d = initEasyDriver() + d.Run() + d.Disable() + gobottest.Assert(t, d.IsEnabled(), false) + gobottest.Assert(t, d.IsMoving(), false) +} + +func TestEasyDriverEnable(t *testing.T) { + // let's test basic functionality + d := initEasyDriver() + d.Disable() + gobottest.Assert(t, d.IsEnabled(), false) + d.Enable() + gobottest.Assert(t, d.IsEnabled(), true) +} \ No newline at end of file