transferred pwm module documentation

docs/en/modules/pwm.md

@@ -0,0 +1,152 @@
+# pwm Module
+
+## pwm.close()
+Quit PWM mode for the specified GPIO pin.
+
+#### Syntax
+`pwm.close(pin)`
+
+#### Parameters
+`pin` 1~12, IO index
+
+#### Returns
+`nil`
+
+#### See also
+[pwm.start()](#pwmstart)
+
+## pwm.getclock()
+Get selected PWM frequency of pin.
+
+#### Syntax
+`pwm.getclock(pin)`
+
+#### Parameters
+`pin` 1~12, IO index
+
+#### Returns
+`number` PWM frequency of pin
+
+#### See also
+[pwm.setclock()](#pwmsetclock)
+
+#### See also
+[pwm.getduty()](#pwmgetduty)
+
+## pwm.getduty()
+Get selected duty cycle of pin.
+
+#### Syntax
+`pwm.getduty(pin)`
+
+#### Parameters
+`pin` 1~12, IO index
+
+#### Returns
+`number` duty cycle, max 1023
+
+#### See also
+[pwm.setduty()](#pwmsetduty)
+
+## pwm.setclock()
+Set PWM frequency.
+**Note:** Setup of the PWM frequency will synchronously change other setups as well if there are any. Only one PWM frequency can be allowed for the system.
+
+#### Syntax
+`pwm.setclock(pin, clock)`
+
+#### Parameters
+- `pin` 1~12, IO index
+- `clock` 1~1000, PWM frequency
+
+#### Returns
+`nil`
+
+#### See also
+[pwm.getclock()](#pwmgetclock)
+
+## pwm.setduty()
+Set duty cycle for a pin.
+
+#### Syntax
+`pwm.setduty(pin, duty)`
+
+#### Parameters
+- `pin` 1~12, IO index
+- `duty` 0~1023, pwm duty cycle, max 1023 (10bit)
+
+#### Returns
+`nil`
+
+#### Example
+```lua
+-- D1 is connected to green led
+-- D2 is connected to blue led
+-- D3 is connected to red led
+pwm.setup(1, 500, 512)
+pwm.setup(2, 500, 512)
+pwm.setup(3, 500, 512)
+pwm.start(1)
+pwm.start(2)
+pwm.start(3)
+function led(r, g, b)
+    pwm.setduty(1, g)
+    pwm.setduty(2, b)
+    pwm.setduty(3, r)
+end
+led(512, 0, 0) --  set led to red
+led(0, 0, 512) -- set led to blue.
+```
+
+## pwm.setup()
+Set pin to PWM mode. Only 6 pins can be set to PWM mode at the most.
+
+#### Syntax
+`pwm.setup(pin, clock, duty)`
+
+#### Parameters
+- `pin` 1~12, IO index
+- `clock` 1~1000, pwm frequency
+- `duty` 0~1023, pwm duty cycle, max 1023 (10bit)
+
+#### Returns
+`nil`
+
+#### Example
+```lua
+-- set pin index 1 as pwm output, frequency is 100Hz, duty cycle is half.
+pwm.setup(1, 100, 512)
+```
+
+#### See also
+[pwm.start()](#pwmstart)
+
+## pwm.start()
+PWM starts, the waveform is applied to the GPIO pin.
+
+#### Syntax
+`pwm.start(pin)`
+
+####Parameters
+`pin` 1~12, IO index
+
+#### Returns
+`nil`
+
+#### See also
+[pwm.stop()](#pwmstop)
+
+## pwm.stop()
+Pause the output of the PWM waveform.
+
+#### Syntax
+`pwm.stop(pin)`
+
+#### Parameters
+`pin` 1~12, IO index
+
+#### Returns
+`nil`
+
+#### See also
+[pwm.start()](#pwmstart)

mkdocs.yml

@@ -37,6 +37,7 @@ pages:
         - 'node': 'en/modules/node.md'
         - 'file': 'en/modules/file.md'
         - 'i2c' : 'en/modules/i2c.md'
+        - 'pwm' : 'en/modules/pwm.md'
         - 'rtcmem': 'en/modules/rtcmem.md'
         - 'rtctime': 'en/modules/rtctime.md'
         - 'rtcfifo': 'en/modules/rtcfifo.md'