PWM/analogWrite() and tone()
Posted: Wed Apr 26, 2017 2:18 pmI have a Touch-TFT display, a photo resistor and a buzzer connected to a Wemos D1 mini. Depending on the photo resistor value (read via A0) I control the background LED of the TFT via analogWrite(). If I touch on the screen I make some click-noise via tone().
Very often (not always!) the screen gets completely dark whenever the first sound rings.
Digging into source code I found, that both (PWM and Tone) are both using timer1. This smells a lot like a concurrency problem.
Can anyone confirm that one must not use PWM and Tone at the same time?
Are there any recommendations to work around that problem? Currently I just analogWrite(PIN, 0) to stop timer1 before any sounds. Ugly, but works.
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Tom
Very often (not always!) the screen gets completely dark whenever the first sound rings.
Digging into source code I found, that both (PWM and Tone) are both using timer1. This smells a lot like a concurrency problem.
Can anyone confirm that one must not use PWM and Tone at the same time?
Are there any recommendations to work around that problem? Currently I just analogWrite(PIN, 0) to stop timer1 before any sounds. Ugly, but works.
--
Tom