Tone generation using PWM

[pmulvey]

My routine is:

def Tone(Speaker, Frequency, Duration):
    pwm = PWM(0, frequency = Frequency)
    pwm = pwm.channel(0, pin=Speaker, duty_cycle = 0.5)
    sleep_ms(Duration)

Calling it with:

Tone(Speaker, 800, 1000)

How do I stop the Tone after the delay?

This routine on the Esp8266 worked:

def Tone(Speaker, Frequency, Duration):
    pwm = PWM(Pin(Speaker))
    pwm.freq(Frequency)
    pwm.duty(500)
    sleep_ms(Duration)
    pwm.deinit()

[pmulvey]

Actually this is a better fix, the previous fix left the Speaker pin High and using power, this leaves it Low.

def Tone(Speaker, Frequency, Duration):
    pwm = PWM(0, frequency = Frequency)
    pwm = pwm.channel(0, pin=Speaker, duty_cycle = 0.5)
    sleep_ms(Duration)
    i = Pin(Speaker, mode=Pin.IN)

I seem to be talking to myself a lot !!?? Anyone else around?

[pmulvey]

I'm answering my own query again but a workaround that I found is this:

def Tone(Speaker, Frequency, Duration):
    pwm = PWM(0, frequency = Frequency)
    pwm = pwm.channel(0, pin=Speaker, duty_cycle = 0.5)
    sleep_ms(Duration)
    pwm = PWM(0, frequency = 4000)

Setting the PWM frequency to >3999Hz kills the output. Must be a more elegant way though.