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
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esp32	Fix Memory leak in addApbChangeCallback() (#3560)	2019-12-30 21:35:29 +02:00