dev notes

You want to understand how does this library works? Great! This article is specially for it.

Common information

Of course, we need timer. After all, esp_timer became best choice - it provide flexible API and low latency. Next, all system should be thread-safe, so we need semaphores and queues.

After some thinking, I found that best way is to queue events and handle it directly from timer's callback. If timer isn't started, I just start one-shot with zero delay.

How can I mix different frequecies in same mixer?

Members of SoundMixer

• esp_timer_handle_t timer - timer for this instance.
• SemaphoreHandle_t mutex - main mutex for thread-unsafe resources.
• SemaphoreHandle_t timerMutex - counting semaphore with two states. Given if timer is active and any event will be handled.
• QueueHandle_t queue - queue for all events.
• dac_channel_t dacCh - it is pretty clear.