gobot.io/x/gobot@v1.16.0/platforms/raspi/pwm_pin_test.go (about)

     1  package raspi
     2  
     3  import (
     4  	"errors"
     5  	"testing"
     6  
     7  	"gobot.io/x/gobot/gobottest"
     8  	"gobot.io/x/gobot/sysfs"
     9  )
    10  
    11  var _ sysfs.PWMPinner = (*PWMPin)(nil)
    12  
    13  func TestPwmPin(t *testing.T) {
    14  	pin := NewPWMPin("1")
    15  	gobottest.Assert(t, pin.Export(), nil)
    16  	gobottest.Assert(t, pin.Enable(true), nil)
    17  	val, _ := pin.Polarity()
    18  	gobottest.Assert(t, val, "normal")
    19  	gobottest.Assert(t, pin.InvertPolarity(true), nil)
    20  	val, _ = pin.Polarity()
    21  	gobottest.Assert(t, val, "normal")
    22  
    23  	period, err := pin.Period()
    24  	gobottest.Assert(t, err, errors.New("Raspi PWM pin period not set"))
    25  	gobottest.Assert(t, pin.SetDutyCycle(10000), errors.New("Raspi PWM pin period not set"))
    26  
    27  	gobottest.Assert(t, pin.SetPeriod(20000000), nil)
    28  	period, _ = pin.Period()
    29  	gobottest.Assert(t, period, uint32(20000000))
    30  	gobottest.Assert(t, pin.SetPeriod(10000000), errors.New("Cannot set the period of individual PWM pins on Raspi"))
    31  
    32  	dc, _ := pin.DutyCycle()
    33  	gobottest.Assert(t, dc, uint32(0))
    34  
    35  	// call currently fails in test
    36  	gobottest.Refute(t, pin.SetDutyCycle(10000), nil)
    37  	dc, _ = pin.DutyCycle()
    38  	gobottest.Assert(t, dc, uint32(10000))
    39  
    40  	gobottest.Assert(t, pin.SetDutyCycle(999999999), errors.New("Duty cycle exceeds period."))
    41  	dc, _ = pin.DutyCycle()
    42  	gobottest.Assert(t, dc, uint32(10000))
    43  
    44  	// call currently fails in test
    45  	gobottest.Refute(t, pin.Unexport(), nil)
    46  }