ESP32 Forum

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ledc_fade_func_install(0);
ledc_isr_register(&ledc_isr_fnc, NULL, ESP_INTR_FLAG_IRAM , NULL);

 while (1) {
            printf("1. LEDC fade up to duty = %d\n", LEDC_TEST_DUTY);
            for (ch = 0; ch < LEDC_TEST_CH_NUM; ch++) {
                ledc_set_fade_with_time(ledc_channel[ch].speed_mode,
                        ledc_channel[ch].channel, LEDC_TEST_DUTY, LEDC_TEST_FADE_TIME);
                ledc_fade_start(ledc_channel[ch].speed_mode,
                        ledc_channel[ch].channel, LEDC_FADE_NO_WAIT);
            }
            vTaskDelay(LEDC_TEST_FADE_TIME / portTICK_PERIOD_MS);
}

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void IRAM_ATTR ledc_isr_fnc( void * arg) {
	printf("OMG, it is works \n");
}

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ledc_fade_func_install(ESP_INTR_FLAG_IRAM);
ledc_isr_register(&ledc_isr_fnc, NULL, ESP_INTR_FLAG_IRAM, NULL);

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void IRAM_ATTR ledc_isr_fnc(void * arg) {

	 uint32_t l_ulCounter = counter++;
	 BaseType_t xHigherPriorityTaskWoken;
	 xQueueSendFromISR(queue, &l_ulCounter, &xHigherPriorityTaskWoken);
	 if( xHigherPriorityTaskWoken )
	     {
	         /* Actual macro used here is port specific. */
		 	 portYIELD_FROM_ISR();
	     }
}