esp-idf/examples/peripherals/ledc/README.md

# LEDC(LED control) Example

###This example shows:

 * init LEDC module:
 
     a.	You need to set the timer of LEDC first, this decide the frequency and resolution of PWM.
     
     b.	You need to set the LEDC channel you want to use, and bind the channel with one of the timers.
     
 * You can install a default fade function, then you can use fade APIs.
 
 * You can also set a target duty directly without fading.
 
 * This example use GPIO18/19/4/5 as LEDC ouput, and it will change the duty repeatedly.

 * GPIO18/19 are from high speed channel group. GPIO4/5 are from low speed channel group.
driver: ledc - update fading functions, add example and doc 1. add fading functions. 2. clear up ledc.c and ledc.h 3. update api doc. 4. add ledc example 5. edit ledc.rst and add readme for example code. 6. add s_ prefix for static global values. 7. add mutex for fade functions 8. minor changes according to the comments. 2016-12-25 10:11:24 -05:00			`# LEDC(LED control) Example`

			`###This example shows:`

			`* init LEDC module:`

			`a. You need to set the timer of LEDC first, this decide the frequency and resolution of PWM.`

			`b. You need to set the LEDC channel you want to use, and bind the channel with one of the timers.`

			`* You can install a default fade function, then you can use fade APIs.`

			`* You can also set a target duty directly without fading.`

			`* This example use GPIO18/19/4/5 as LEDC ouput, and it will change the duty repeatedly.`

Feature: add ledc low speed channels 1. Add low speed channels for LEDC module. 2. Improve fade object allocate mechanism. 3. Improve ledc example, add 2 low speed channels in example. 4. Remove debug code 5. Improve the register bit field name of slow clock. 2017-02-08 06:52:18 -05:00			`* GPIO18/19 are from high speed channel group. GPIO4/5 are from low speed channel group.`