feat(led): allow LEDC ISR to be configured onto specific cores (#328)

* feat(led): allow LEDC ISR to be configured onto specific cores

* add missing include / dep

* update style of comment

Author: finger563

components/led/CMakeLists.txt

@@ -1,3 +1,3 @@
 idf_component_register(
   INCLUDE_DIRS "include"
-  REQUIRES base_component driver)
+  REQUIRES base_component driver task)

components/led/include/led.hpp

@@ -10,6 +10,7 @@
 #include <freertos/semphr.h>
 
 #include "base_component.hpp"
+#include "run_on_core.hpp"
 
 namespace espp {
 /**
@@ -42,9 +43,13 @@ class Led : public BaseComponent {
    *  channels that should be associated.
    */
   struct Config {
-    ledc_timer_t timer;  /**< The LEDC timer that you want associated with the LEDs. */
-    size_t frequency_hz; /**< The frequency that you want to run the PWM hardawre for the LEDs at.
-                            @note this is inversely related to the duty resolution configuration. */
+    int isr_core_id = -1; /**< The core to install the LEDC fade function (interrupt) on. If
+                            -1, then the LEDC interrupt is installed on the core that this
+                            constructor is called on. If 0 or 1, then the LEDC interrupt is
+                            installed on the specified core. */
+    ledc_timer_t timer;   /**< The LEDC timer that you want associated with the LEDs. */
+    size_t frequency_hz;  /**< The frequency that you want to run the PWM hardawre for the LEDs at.
+                             @note this is inversely related to the duty resolution configuration. */
     std::vector<ChannelConfig> channels; /**< The LED channels that you want to control. */
     ledc_timer_bit_t duty_resolution{
         LEDC_TIMER_13_BIT}; /**< The resolution of the duty cycle for these LEDs. @note this is
@@ -94,9 +99,14 @@ class Led : public BaseComponent {
     logger_.info("Initializing the fade service");
     static bool fade_service_installed = false;
     if (!fade_service_installed) {
-      ledc_fade_func_install(0);
-      fade_service_installed = true;
+      auto install_fn = []() -> esp_err_t { return ledc_fade_func_install(0); };
+      auto err = espp::task::run_on_core(install_fn, config.isr_core_id);
+      if (err != ESP_OK) {
+        logger_.error("install ledc fade service failed {}", esp_err_to_name(err));
+      }
+      fade_service_installed = err == ESP_OK;
     }
+
     ledc_cbs_t callbacks = {.fade_cb = &Led::cb_ledc_fade_end_event};
 
     // we associate each channel with its own semaphore so that they can be