ESP8266_RTOS_SDK/examples/peripherals/pwm

PWM Example

• This example will show you how to use PWM module by running four channels:
  • Observe PWM signal with logic analyzer or oscilloscope.

Pin assignment

* GPIO12 is assigned as the PWM channel 0.  
* GPIO13 is assigned as the PWM channel 1.  
* GPIO14 is assigned as the PWM channel 2.  
* GPIO15 is assigned as the PWM channel 3.  

How to use example

Hardware Required

• Connection:
  • Connect the PWM channel to a logic analyzer or oscilloscope.

Configure the project

make menuconfig

• Set serial port under Serial Flasher Options.

Build and Flash

Build the project and flash it to the board, then run monitor tool to view serial output:

make -j4 flash monitor

(To exit the serial monitor, type Ctrl-].)

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Example Output

• LOG:

I (220) gpio: GPIO[12]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
I (225) gpio: GPIO[13]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
I (247) gpio: GPIO[14]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
I (251) gpio: GPIO[15]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
I (265) pwm: --- PWM v3.2

I (20276) main: PWM stop

I (30276) main: PWM re-start

I (50276) main: PWM stop

I (60279) main: PWM re-start

I (80279) main: PWM stop

I (90279) main: PWM re-start

I (110272) main: PWM stop

I (120272) main: PWM re-start

• WAVE FORM: