chuck todd 9ad860758c Fix Memory leak in addApbChangeCallback() (#3560) ...

* `ledcWriteTone()` added a `apbcallback()` evertime the tone value was non zero.  
* `addApbChangeCallback()` did not detect duplicate callbacks.
* changed the apbcallback list to a double link to support roll forward, roll back execution.  This made the sequences of clock change callback start with the newest registered -> to oldest on the `before` then oldest -> newest after the clock change.  This made the UART debug log output have minimal gibberish during the clock change.
* change how the UART callback handled the MUTEX because if any `apbchangeCallback()` executed a `log_x()` a deadlock would occur.

This fixes #3555

2019-12-30 21:35:29 +02:00

..

esp32

Fix Memory leak in addApbChangeCallback() (#3560)

2019-12-30 21:35:29 +02:00