LEDC Block¶
How this block appears in a Simulink model?¶
What can be configured?¶
| Configuration Parameter | Selectable Option/Value | Description |
|---|---|---|
| LEDC Timer | LEDC_TIMER_0--LEDC_TIMER_1--LEDC_TIMER_2--LEDC_TIMER_3 | Select the timer |
| Duty Resolution | LEDC_TIMER_1_BIT to LEDC_TIMER_20_BIT | Select the duty resolution |
| PWM Frequency (Hz) | Select the PWM frequency | |
| Timer Speed Mode | LED_HIGH_SPEED_MODE--LED_LOW_SPEED_MODE | Select the LEDC driver speed mode |
| Source Clock | If the value for this parameter is LEDC_AUTO_CLOCK, the clock will be selected automatically | |
| Hide unused channel configurations | on--off | The channels assigned Do not use will be hidden |
| hpoint | specify the hpoint | |
| Duty Cycle Mode | Using hardware--Using software | Select the duty cycle mode. the Duty cycle mode will also change the input method (from mask or from input port) for this parameter |
| Fade function | ledc_set_fade_time_and_start--ledc_set_fade_step_and_start | In the hardware mode the user will be able to select the fade function to be used |
| Target Duty | Specify the target duty. The maximum of this parameter depend on the timer configurations. Check reference for more information | |
| Max Fade Time (milliseconds) | Specify the time duration for the fade | |
| Fade Mode | LEDC_FADE_NO_WAIT--LEDC_FADE_DONE | Select fade mode |
| Scale | Select scale | |
| Cycle Number | Select cycle number |
When to use this block?¶
This block is designed to control LED intensity using PWM signals. This block could be used for other similar applications involving PWM signal generation as well.
How does this block work?¶
- The ESP32 family has 8 high speed channels and 8 low speed channels while ESP32-S2 has 8 low speed channels to generate LED PWM.
- There are four Timer modules to be selected.
- When the PWM frequency increases the resolution decreases.
Reference¶
Check LED Control documentation of ESPRESSIF
Demo¶
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