PWM - Pulse Width Modulation

This class provides the feature of PWM output.

Note: BC25 series module does not support this feature.

Constructor

misc.PWM

class misc.PWM(PWM.PWMn,PWM.ABOVE_xx, highTime, cycleTime)

Parameter:

• PWM.PWMn - Integer type. PWM channel. Click here to learn more for supported channels and corresponding pins.

• PWM.ABOVE_xx - Integer type. Time range.

  For EC200U, EC600U , EG915U and EG912U series modules:
  PWM.ABOVE_MS ms-level time range: (0,10]
  PWM.ABOVE_1US us-level time range: (0,10000]
  PWM.ABOVE_10US us-level time range: (1,10000]
  PWM.ABOVE_BELOW_US ns-level time range: [100,65535]

• highTime - Integer type. High level time.

  For ms-level time, unit: ms.
  For us-level time, unit: us.
  For ns-level: it needs to be calculated by users.
  Frequency = 13Mhz / cycleTime
  Duty cycle = highTime/ cycleTime

• cycleTime - Integer type. Cycle time.

  For ms-level time, unit: ms.
  For us-level time, unit: us.
  For ns-level: it needs to be calculated by users.
  Frequency = 13Mhz / cycleTime
  Duty cycle = highTime/ cycleTime

Example:

 from misc import PWM
 pwm1 = PWM(PWM.PWM1, PWM.ABOVE_MS, 1, 2)

Mapping Relationship Between PWM Channels and Pysical Pins:

The corresponding pins of EC100Y series module for PWM0-PWM3 are as follows:
PWM0 – pin19
PWM1 – pin18
PWM2 – pin23
PWM3 – pin22
The corresponding pins of EC600S-CN and EC600N modules for PWM0-PWM3 are as follows:
PWM0 – pin52
PWM1 – pin53
PWM2 – pin70
PWM3 – pin69
The corresponding pins of EC800N module for PWM0-PWM3 are as follows:
PWM0 – pin79
PWM1 – pin78
PWM2 – pin16
PWM3 – pin49
The corresponding pin of EC200U series module for PWM0 is as follows:
PWM0 – pin135
The corresponding pin of EC600U series module for PWM0 is as follows:
PWM0 – pin70
The corresponding pins of EC600M module for PWM0-PWM3 are as follows:
PWM0 – pin57
PWM1 – pin56
PWM2 – pin70
PWM3 – pin69
The corresponding pin of EG915U series module for PWM0 is as follows:
PWM0 – pin20
The corresponding pins of EC800M/EG810M module for PWM0-PWM3 are as follows:
PWM0 – pin83
PWM1 – pin78
PWM2 – pin16
PWM3 – pin49
The corresponding pins of EG912N module for PWM0-PWM3 are as follows:
PWM0 – pin21
PWM1 – pin116
PWM2 – pin107
PWM3 – pin92

The corresponding pins of EG912U module for PWM0 are as follow:
PWM0 – pin20

The corresponding pins of BG95 module for PWM0-PWM1 are as follow:
PWM0 – pin66
PWM1 – pin85

The corresponding pins of EC200A/UC200A module for PWM0-PWM2 are as follow:
PWM0 – pin1
PWM1 – pin4
PWM2 – pin6

Methods

PWM.open

PWM.open()

This methods enables PWM output.

Return Value:

0 - Successful execution

-1 - Failed execution

PWM.close

PWM.close()

This methods disables PWM output.

Return Value:

0 - Successful execution

-1 - Failed execution

Example:

from misc import PWM
import utime
if __name__ == '__main__':
    pwm = PWM(PWM.PWM0, PWM.ABOVE_MS, 1, 2)  # Initializes a PWM object
    pwm.open()  # Enables PWM output
    utime.sleep(10)
    pwm.close()  # Disables PWM output

Constants