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Keep PWM phases constant #7057

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Keep PWM phases constant #7057

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7f2c4e9
Make sure PWM phases remain constant
s-hadinger Feb 2, 2020
64c6f04
Remove the entire waveform overshoot compensation
Feb 26, 2020
7f821ce
Avoid thrashing
s-hadinger Mar 3, 2020
d7852d2
Merge branch 'master' of https://github.com/esp8266/Arduino into patch-1
s-hadinger Apr 8, 2020
5db5df6
Better handling of interrupt storm during wifi connection
s-hadinger Apr 8, 2020
4f4b504
Better handling of interrupt storm during wifi connection
s-hadinger Apr 8, 2020
c70e835
Merge branch 'master' of https://github.com/esp8266/Arduino into patch-1
s-hadinger May 6, 2020
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Remove the entire waveform overshoot compensation
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Hadinger committed Feb 26, 2020
commit 64c6f047aa9afc2c9bbcb11edcb59b6862fef645
8 changes: 7 additions & 1 deletion cores/esp8266/core_esp8266_waveform.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -256,7 +256,13 @@ static ICACHE_RAM_ATTR void timer1Interrupt() {
// Check for toggles
int32_t cyclesToGo = wave->nextServiceCycle - now;
if (cyclesToGo < 0) {
cyclesToGo = -((-cyclesToGo) % (wave->nextTimeHighCycles + wave->nextTimeLowCycles));
// See #7057
// The following is a no-op unless we have overshot by an entire waveform cycle.
// As modulus is an expensive operation, this code is removed for now:
// cyclesToGo = -((-cyclesToGo) % (wave->nextTimeHighCycles + wave->nextTimeLowCycles));
//
// Alternative version with lower CPU impact:
// while (-cyclesToGo > wave->nextTimeHighCycles + wave->nextTimeLowCycles) { cyclesToGo += wave->nextTimeHighCycles + wave->nextTimeLowCycles)};
waveformState ^= mask;
if (waveformState & mask) {
if (i == 16) {
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