led pwm, menu fold

book.toml

@@ -7,11 +7,15 @@ src = "src"
 
 [output.html]
 git-repository-url = "https://github.com/ImplFerris/esp32-book"
-cname = "esp.implrust.com"
+cname = "esp32.implrust.com"
 preferred-dark-theme = "ayu"
 preferred-light-theme = "rust"
 default-theme = "light"
 mathjax-support = true
 
 # [output.html.playground]
 # editable = true
+
+[output.html.fold]
+enable = true
+level = 1     # the depth to start folding

src/SUMMARY.md

@@ -10,6 +10,6 @@
     - [Voltage Divider](./core-concepts/voltage-divider.md)
     - [ADC](./core-concepts/adc.md)
     - [PWM](./core-concepts/pwm/index.md)
+        - [LED PWM Controller](./core-concepts/pwm/led-pwm-controller.md)
     - [no_std, no_main in Rust](./core-concepts/no-std-main.md)
 - [Dimming LED](./dimming-led/index.md)
-    - [LED PWM Controller](./core-concepts/pwm/led-pwm-controller.md)

src/core-concepts/pwm/led-pwm-controller.md

@@ -1 +1,8 @@
-# LED PWM Controller
+# LED PWM Controller(LEDC)
+
+The ESP32 has LED PWM Controller(LEDC) that generates PWM signals for controlling LEDs(example, dimming effect). However, its functionality isn't limited to LEDs;you can use it for other applications as well.  If you are not familiar with PWM(Pulse Width Modulation), i recommend you to check the PWM section [here](../core-concepts/pwm.md). 
+
+The LEDC includes 16 independent PWM generators and supports a maximum PWM duty cycle resolution of 20 bits. The 16 PWM channels further classified into two types: 8 high speed channel and 8 low speed channels.
+
+The PWM controller can automatically increase or decrease the duty cycle gradually, allowing for smooth fades without using the processor. For more details, refer to page 390 of the [ESP32 Technical Reference Manual](https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf#ledpwm).
+

src/dimming-led/index.md

@@ -1,6 +1,7 @@
 # Dimming LED
 
-In this exercise, we'll dim an external LED using Pulse Width Modulation (PWM), which will be explained in the next chapter. 
+In this exercise, we'll dim an external LED using Pulse Width Modulation (PWM). Before you begin, I recommend reading the [PWM and LED PWM sections](../core-concepts/pwm/index.md) in the Core Concepts chapter.
+
 
 ## Hardware Requirements
 

src/esp32-intro/esp32-family.md

@@ -105,4 +105,3 @@ The following are basic specs for the ESP32:
 ## Reference
 - [Buyers Guide](https://eitherway.io/posts/esp32-buyers-guide/)
 - [Chip Series Comparison](https://docs.espressif.com/projects/esp-idf/en/v5.0/esp32s3/hw-reference/chip-series-comparison.html)
-- [ESP32 Guide 2024 Video](https://www.youtube.com/watch?v=u5unB24lhC4)