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Support multiple tone(), analogWrite(), and Servo (#4640)

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Remove and rewrite all the parts of the core/libraries using TIMER1
and consolidate into a single, shared waveform generation interrupt
structure.  Tone, analogWrite(), Servo all now just call into this
shared resource to perform their tasks so are all compatible
and can be used simultaneously.

This setup enables multiple tones, analogWrites, servos, and stepper
motors to be controlled with reasonable accuracy.  It uses both TIMER1
and the internal ESP cycle counter to handle timing of waveform edges.
TIMER1 is used in non-reload mode and only edges cause interrupts.  The
interrupt is started and stopped as required, minimizing overhead when
these features are not being used.

A generic "startWaveform(pin, high-US, low-US, runtime-US)" and
"stopWaveform(pin)" allow for further types of interfaces.  Minimum
high or low period is ~1 us.

Add a tone(float) method, useful when working with lower frequencies.

Fixes #4321.  Fixes 4349.
This commit is contained in:
Earle F. Philhower, III
2018-06-07 18:38:58 -07:00
committed by GitHub
parent ea4720b03e
commit ebda795f34
12 changed files with 599 additions and 840 deletions
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cores/esp8266/Arduino.h
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@@ -279,6 +279,7 @@ unsigned long pulseIn(uint8_t pin, uint8_t state, unsigned long timeout = 100000
unsigned long pulseInLong(uint8_t pin, uint8_t state, unsigned long timeout = 1000000L);
void tone(uint8_t _pin, unsigned int frequency, unsigned long duration = 0);
void tone(uint8_t _pin, double frequency, unsigned long duration = 0);
void noTone(uint8_t _pin);
// WMath prototypes