diff --git a/lib/ESP8266PWM/src/core_esp8266_waveform_pwm.cpp b/lib/ESP8266PWM/src/core_esp8266_waveform_pwm.cpp
new file mode 100644
index 0000000000..78c7160d90
--- /dev/null
+++ b/lib/ESP8266PWM/src/core_esp8266_waveform_pwm.cpp
@@ -0,0 +1,717 @@
+/* esp8266_waveform imported from platform source code
+   Modified for WLED to work around a fault in the NMI handling,
+   which can result in the system locking up and hard WDT crashes.
+
+   Imported from https://github.com/esp8266/Arduino/blob/7e0d20e2b9034994f573a236364e0aef17fd66de/cores/esp8266/core_esp8266_waveform_pwm.cpp
+*/
+
+/*
+  esp8266_waveform - General purpose waveform generation and control,
+                     supporting outputs on all pins in parallel.
+
+  Copyright (c) 2018 Earle F. Philhower, III.  All rights reserved.
+
+  The core idea is to have a programmable waveform generator with a unique
+  high and low period (defined in microseconds or CPU clock cycles).  TIMER1
+  is set to 1-shot mode and is always loaded with the time until the next
+  edge of any live waveforms.
+
+  Up to one waveform generator per pin supported.
+
+  Each waveform generator is synchronized to the ESP clock cycle counter, not
+  the timer.  This allows for removing interrupt jitter and delay as the
+  counter always increments once per 80MHz clock.  Changes to a waveform are
+  contiguous and only take effect on the next waveform transition,
+  allowing for smooth transitions.
+
+  This replaces older tone(), analogWrite(), and the Servo classes.
+
+  Everywhere in the code where "cycles" is used, it means ESP.getCycleCount()
+  clock cycle count, or an interval measured in CPU clock cycles, but not
+  TIMER1 cycles (which may be 2 CPU clock cycles @ 160MHz).
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+*/
+
+
+#include <Arduino.h>
+#include <coredecls.h>
+#include "ets_sys.h"
+#include "core_esp8266_waveform.h"
+#include "user_interface.h"
+
+extern "C" {
+
+// Linker magic
+void usePWMFixedNMI() {};
+
+// Maximum delay between IRQs
+#define MAXIRQUS (10000)
+
+// Waveform generator can create tones, PWM, and servos
+typedef struct {
+  uint32_t nextServiceCycle;   // ESP cycle timer when a transition required
+  uint32_t expiryCycle;        // For time-limited waveform, the cycle when this waveform must stop
+  uint32_t timeHighCycles;     // Actual running waveform period (adjusted using desiredCycles)
+  uint32_t timeLowCycles;      //
+  uint32_t desiredHighCycles;  // Ideal waveform period to drive the error signal
+  uint32_t desiredLowCycles;   //
+  uint32_t lastEdge;           // Cycle when this generator last changed
+} Waveform;
+
+class WVFState {
+public:
+  Waveform waveform[17];        // State of all possible pins
+  uint32_t waveformState = 0;   // Is the pin high or low, updated in NMI so no access outside the NMI code
+  uint32_t waveformEnabled = 0; // Is it actively running, updated in NMI so no access outside the NMI code
+
+  // Enable lock-free by only allowing updates to waveformState and waveformEnabled from IRQ service routine
+  uint32_t waveformToEnable = 0;  // Message to the NMI handler to start a waveform on a inactive pin
+  uint32_t waveformToDisable = 0; // Message to the NMI handler to disable a pin from waveform generation
+
+  uint32_t waveformToChange = 0; // Mask of pin to change. One bit set in main app, cleared when effected in the NMI
+  uint32_t waveformNewHigh = 0;
+  uint32_t waveformNewLow = 0;
+
+  uint32_t (*timer1CB)() = NULL;
+
+  // Optimize the NMI inner loop by keeping track of the min and max GPIO that we
+  // are generating.  In the common case (1 PWM) these may be the same pin and
+  // we can avoid looking at the other pins.
+  uint16_t startPin = 0;
+  uint16_t endPin = 0;
+};
+static WVFState wvfState;
+
+
+// Ensure everything is read/written to RAM
+#define MEMBARRIER() { __asm__ volatile("" ::: "memory"); }
+
+// Non-speed critical bits
+#pragma GCC optimize ("Os")
+
+// Interrupt on/off control
+static IRAM_ATTR void timer1Interrupt();
+static bool timerRunning = false;
+
+static __attribute__((noinline)) void initTimer() {
+  if (!timerRunning) {
+    timer1_disable();
+    ETS_FRC_TIMER1_INTR_ATTACH(NULL, NULL);
+    ETS_FRC_TIMER1_NMI_INTR_ATTACH(timer1Interrupt);
+    timer1_enable(TIM_DIV1, TIM_EDGE, TIM_SINGLE);
+    timerRunning = true;
+    timer1_write(microsecondsToClockCycles(10));
+  }
+}
+
+static IRAM_ATTR void forceTimerInterrupt() {
+  if (T1L > microsecondsToClockCycles(10)) {
+    T1L = microsecondsToClockCycles(10);
+  }
+}
+
+// PWM implementation using special purpose state machine
+//
+// Keep an ordered list of pins with the delta in cycles between each
+// element, with a terminal entry making up the remainder of the PWM
+// period.  With this method sum(all deltas) == PWM period clock cycles.
+//
+// At t=0 set all pins high and set the timeout for the 1st edge.
+// On interrupt, if we're at the last element reset to t=0 state
+// Otherwise, clear that pin down and set delay for next element
+// and so forth.
+
+constexpr int maxPWMs = 8;
+
+// PWM machine state
+typedef struct PWMState {
+  uint32_t mask; // Bitmask of active pins
+  uint32_t cnt;  // How many entries
+  uint32_t idx;  // Where the state machine is along the list
+  uint8_t  pin[maxPWMs + 1];
+  uint32_t delta[maxPWMs + 1];
+  uint32_t nextServiceCycle;  // Clock cycle for next step
+  struct PWMState *pwmUpdate; // Set by main code, cleared by ISR
+} PWMState;
+
+static PWMState pwmState;
+static uint32_t _pwmFreq = 1000;
+static uint32_t _pwmPeriod = microsecondsToClockCycles(1000000UL) / _pwmFreq;
+
+
+// If there are no more scheduled activities, shut down Timer 1.
+// Otherwise, do nothing.
+static IRAM_ATTR void disableIdleTimer() {
+ if (timerRunning && !wvfState.waveformEnabled && !pwmState.cnt && !wvfState.timer1CB) {
+    ETS_FRC_TIMER1_NMI_INTR_ATTACH(NULL);
+    timer1_disable();
+    timer1_isr_init();
+    timerRunning = false;
+  }
+}
+
+// Notify the NMI that a new PWM state is available through the mailbox.
+// Wait for mailbox to be emptied (either busy or delay() as needed)
+static IRAM_ATTR void _notifyPWM(PWMState *p, bool idle) {
+  p->pwmUpdate = nullptr;
+  pwmState.pwmUpdate = p;
+  MEMBARRIER();
+  forceTimerInterrupt();
+  while (pwmState.pwmUpdate) {
+    if (idle) {
+      esp_yield();
+    }
+    MEMBARRIER();
+  }
+}
+
+static void _addPWMtoList(PWMState &p, int pin, uint32_t val, uint32_t range);
+
+
+// Called when analogWriteFreq() changed to update the PWM total period
+//extern void _setPWMFreq_weak(uint32_t freq) __attribute__((weak)); 
+void _setPWMFreq_weak(uint32_t freq) {
+  _pwmFreq = freq;
+
+  // Convert frequency into clock cycles
+  uint32_t cc = microsecondsToClockCycles(1000000UL) / freq;
+
+  // Simple static adjustment to bring period closer to requested due to overhead
+  // Empirically determined as a constant PWM delay and a function of the number of PWMs
+#if F_CPU == 80000000
+  cc -= ((microsecondsToClockCycles(pwmState.cnt) * 13) >> 4) + 110;
+#else
+  cc -= ((microsecondsToClockCycles(pwmState.cnt) * 10) >> 4) + 75;
+#endif
+
+  if (cc == _pwmPeriod) {
+    return; // No change
+  }
+
+  _pwmPeriod = cc;
+
+  if (pwmState.cnt) {
+    PWMState p;  // The working copy since we can't edit the one in use
+    p.mask = 0;
+    p.cnt = 0;
+    for (uint32_t i = 0; i < pwmState.cnt; i++) {
+      auto pin = pwmState.pin[i];
+      _addPWMtoList(p, pin, wvfState.waveform[pin].desiredHighCycles, wvfState.waveform[pin].desiredLowCycles);
+    }
+    // Update and wait for mailbox to be emptied
+    initTimer();
+    _notifyPWM(&p, true);
+    disableIdleTimer();
+  }
+}
+/*
+static void _setPWMFreq_bound(uint32_t freq) __attribute__((weakref("_setPWMFreq_weak")));
+void _setPWMFreq(uint32_t freq) { 
+  _setPWMFreq_bound(freq);
+}
+*/
+
+// Helper routine to remove an entry from the state machine
+// and clean up any marked-off entries
+static void _cleanAndRemovePWM(PWMState *p, int pin) {
+  uint32_t leftover = 0;
+  uint32_t in, out;
+  for (in = 0, out = 0; in < p->cnt; in++) {
+    if ((p->pin[in] != pin) && (p->mask & (1<<p->pin[in]))) {
+        p->pin[out] = p->pin[in];
+        p->delta[out] = p->delta[in] + leftover;
+        leftover = 0;
+        out++;
+    } else {
+        leftover += p->delta[in];
+        p->mask &= ~(1<<p->pin[in]);
+    }
+  }
+  p->cnt = out;
+  // Final pin is never used: p->pin[out] = 0xff;
+  p->delta[out] = p->delta[in] + leftover;
+}
+
+
+// Disable PWM on a specific pin (i.e. when a digitalWrite or analogWrite(0%/100%))
+//extern bool _stopPWM_weak(uint8_t pin) __attribute__((weak));
+IRAM_ATTR bool _stopPWM_weak(uint8_t pin) {
+  if (!((1<<pin) & pwmState.mask)) {
+    return false; // Pin not actually active
+  }
+
+  PWMState p;  // The working copy since we can't edit the one in use
+  p = pwmState;
+
+  // In _stopPWM we just clear the mask but keep everything else
+  // untouched to save IRAM.  The main startPWM will handle cleanup.
+  p.mask &= ~(1<<pin);
+  if (!p.mask) {
+    // If all have been stopped, then turn PWM off completely
+    p.cnt = 0;
+  }
+
+  // Update and wait for mailbox to be emptied, no delay (could be in ISR)
+  _notifyPWM(&p, false);
+  // Possibly shut down the timer completely if we're done
+  disableIdleTimer();
+  return true;
+}
+/*
+static bool _stopPWM_bound(uint8_t pin) __attribute__((weakref("_stopPWM_weak")));
+IRAM_ATTR bool _stopPWM(uint8_t pin) {
+  return _stopPWM_bound(pin);
+}
+*/
+
+static void _addPWMtoList(PWMState &p, int pin, uint32_t val, uint32_t range) {
+  // Stash the val and range so we can re-evaluate the fraction
+  // should the user change PWM frequency.  This allows us to
+  // give as great a precision as possible.  We know by construction
+  // that the waveform for this pin will be inactive so we can borrow
+  // memory from that structure.
+  wvfState.waveform[pin].desiredHighCycles = val;  // Numerator == high
+  wvfState.waveform[pin].desiredLowCycles = range; // Denominator == low
+
+  uint32_t cc = (_pwmPeriod * val) / range;
+
+  // Clip to sane values in the case we go from OK to not-OK when adjusting frequencies
+  if (cc == 0) {
+    cc = 1;
+  } else if (cc >= _pwmPeriod) {
+    cc = _pwmPeriod - 1;
+  }
+
+  if (p.cnt == 0) {
+    // Starting up from scratch, special case 1st element and PWM period
+    p.pin[0] = pin;
+    p.delta[0] = cc;
+   // Final pin is never used: p.pin[1] = 0xff;
+    p.delta[1] = _pwmPeriod - cc;
+  } else {
+    uint32_t ttl = 0;
+    uint32_t i;
+    // Skip along until we're at the spot to insert
+    for (i=0; (i <= p.cnt) && (ttl + p.delta[i] < cc); i++) {
+      ttl += p.delta[i];
+    }
+    // Shift everything out by one to make space for new edge
+    for (int32_t j = p.cnt; j >= (int)i; j--) {
+      p.pin[j + 1] = p.pin[j];
+      p.delta[j + 1] = p.delta[j];
+    }
+    int off = cc - ttl; // The delta from the last edge to the one we're inserting
+    p.pin[i] = pin;
+    p.delta[i] = off; // Add the delta to this new pin
+    p.delta[i + 1] -= off; // And subtract it from the follower to keep sum(deltas) constant
+  }
+  p.cnt++;
+  p.mask |= 1<<pin;
+}
+
+// Called by analogWrite(1...99%) to set the PWM duty in clock cycles
+//extern bool _setPWM_weak(int pin, uint32_t val, uint32_t range) __attribute__((weak));
+bool _setPWM_weak(int pin, uint32_t val, uint32_t range) {
+  stopWaveform(pin);
+  PWMState p;  // Working copy
+  p = pwmState;
+  // Get rid of any entries for this pin
+  _cleanAndRemovePWM(&p, pin);
+  // And add it to the list, in order
+  if (p.cnt >= maxPWMs) {
+    return false; // No space left
+  }
+
+  // Sanity check for all-on/off
+  uint32_t cc = (_pwmPeriod * val) / range;
+  if ((cc == 0) || (cc >= _pwmPeriod)) {
+    digitalWrite(pin, cc ? HIGH : LOW);
+    return true;
+  }
+
+  _addPWMtoList(p, pin, val, range);
+
+  // Set mailbox and wait for ISR to copy it over
+  initTimer();
+  _notifyPWM(&p, true);
+  disableIdleTimer();
+
+  // Potentially recalculate the PWM period if we've added another pin
+  _setPWMFreq(_pwmFreq);
+
+  return true;
+}
+/*
+static bool _setPWM_bound(int pin, uint32_t val, uint32_t range) __attribute__((weakref("_setPWM_weak")));
+bool _setPWM(int pin, uint32_t val, uint32_t range) {
+  return _setPWM_bound(pin, val, range);
+}
+*/
+
+// Start up a waveform on a pin, or change the current one.  Will change to the new
+// waveform smoothly on next low->high transition.  For immediate change, stopWaveform()
+// first, then it will immediately begin.
+//extern int startWaveformClockCycles_weak(uint8_t pin, uint32_t timeHighCycles, uint32_t timeLowCycles, uint32_t runTimeCycles, int8_t alignPhase, uint32_t phaseOffsetUS, bool autoPwm)  __attribute__((weak));
+int startWaveformClockCycles_weak(uint8_t pin, uint32_t timeHighCycles, uint32_t timeLowCycles, uint32_t runTimeCycles,
+                             int8_t alignPhase, uint32_t phaseOffsetUS, bool autoPwm) {
+  (void) alignPhase;
+  (void) phaseOffsetUS;
+  (void) autoPwm;
+
+   if ((pin > 16) || isFlashInterfacePin(pin) || (timeHighCycles == 0)) {
+    return false;
+  }
+  Waveform *wave = &wvfState.waveform[pin];
+  wave->expiryCycle = runTimeCycles ? ESP.getCycleCount() + runTimeCycles : 0;
+  if (runTimeCycles && !wave->expiryCycle) {
+    wave->expiryCycle = 1; // expiryCycle==0 means no timeout, so avoid setting it
+  }
+
+  _stopPWM(pin); // Make sure there's no PWM live here
+
+  uint32_t mask = 1<<pin;
+  MEMBARRIER();
+  if (wvfState.waveformEnabled & mask) {
+    // Make sure no waveform changes are waiting to be applied
+    while (wvfState.waveformToChange) {
+      esp_yield(); // Wait for waveform to update
+      MEMBARRIER();
+    }
+    wvfState.waveformNewHigh = timeHighCycles;
+    wvfState.waveformNewLow = timeLowCycles;
+    MEMBARRIER();
+    wvfState.waveformToChange = mask;
+    // The waveform will be updated some time in the future on the next period for the signal
+  } else { //  if (!(wvfState.waveformEnabled & mask)) {
+    wave->timeHighCycles = timeHighCycles;
+    wave->desiredHighCycles = timeHighCycles;
+    wave->timeLowCycles = timeLowCycles;
+    wave->desiredLowCycles = timeLowCycles;
+    wave->lastEdge = 0;
+    wave->nextServiceCycle = ESP.getCycleCount() + microsecondsToClockCycles(1);
+    wvfState.waveformToEnable |= mask;
+    MEMBARRIER();
+    initTimer();
+    forceTimerInterrupt();
+    while (wvfState.waveformToEnable) {
+      esp_yield(); // Wait for waveform to update
+      MEMBARRIER();
+    }
+  }
+
+  return true;
+}
+/*
+static int startWaveformClockCycles_bound(uint8_t pin, uint32_t timeHighCycles, uint32_t timeLowCycles, uint32_t runTimeCycles, int8_t alignPhase, uint32_t phaseOffsetUS, bool autoPwm) __attribute__((weakref("startWaveformClockCycles_weak")));
+int startWaveformClockCycles(uint8_t pin, uint32_t timeHighCycles, uint32_t timeLowCycles, uint32_t runTimeCycles, int8_t alignPhase, uint32_t phaseOffsetUS, bool autoPwm) {
+  return startWaveformClockCycles_bound(pin, timeHighCycles, timeLowCycles, runTimeCycles, alignPhase, phaseOffsetUS, autoPwm);
+}
+
+
+// This version falls-thru to the proper startWaveformClockCycles call and is invariant across waveform generators
+int startWaveform(uint8_t pin, uint32_t timeHighUS, uint32_t timeLowUS, uint32_t runTimeUS,
+                  int8_t alignPhase, uint32_t phaseOffsetUS, bool autoPwm) {
+  return startWaveformClockCycles_bound(pin,
+    microsecondsToClockCycles(timeHighUS), microsecondsToClockCycles(timeLowUS),
+    microsecondsToClockCycles(runTimeUS), alignPhase, microsecondsToClockCycles(phaseOffsetUS), autoPwm);
+}
+*/
+
+// Set a callback.  Pass in NULL to stop it
+//extern void setTimer1Callback_weak(uint32_t (*fn)()) __attribute__((weak));
+void setTimer1Callback_weak(uint32_t (*fn)()) {
+  wvfState.timer1CB = fn;
+  if (fn) {
+    initTimer();
+    forceTimerInterrupt();
+  }
+  disableIdleTimer();
+}
+/*
+static void setTimer1Callback_bound(uint32_t (*fn)()) __attribute__((weakref("setTimer1Callback_weak")));
+void setTimer1Callback(uint32_t (*fn)()) {
+  setTimer1Callback_bound(fn);
+}
+*/
+
+// Stops a waveform on a pin
+//extern int stopWaveform_weak(uint8_t pin) __attribute__((weak));
+IRAM_ATTR int stopWaveform_weak(uint8_t pin) {
+  // Can't possibly need to stop anything if there is no timer active
+  if (!timerRunning) {
+    return false;
+  }
+  // If user sends in a pin >16 but <32, this will always point to a 0 bit
+  // If they send >=32, then the shift will result in 0 and it will also return false
+  uint32_t mask = 1<<pin;
+  if (wvfState.waveformEnabled & mask) {
+    wvfState.waveformToDisable = mask;
+    // Cancel any pending updates for this waveform, too.
+    if (wvfState.waveformToChange & mask) {
+        wvfState.waveformToChange = 0;
+    }
+    forceTimerInterrupt();
+    while (wvfState.waveformToDisable) {
+      MEMBARRIER(); // If it wasn't written yet, it has to be by now
+      /* no-op */ // Can't delay() since stopWaveform may be called from an IRQ
+    }
+  }
+  disableIdleTimer();
+  return true;
+}
+/*
+static int stopWaveform_bound(uint8_t pin) __attribute__((weakref("stopWaveform_weak")));
+IRAM_ATTR int stopWaveform(uint8_t pin) {
+  return stopWaveform_bound(pin);
+}
+*/
+
+// Speed critical bits
+#pragma GCC optimize ("O2")
+
+// Normally would not want two copies like this, but due to different
+// optimization levels the inline attribute gets lost if we try the
+// other version.
+static inline IRAM_ATTR uint32_t GetCycleCountIRQ() {
+  uint32_t ccount;
+  __asm__ __volatile__("rsr %0,ccount":"=a"(ccount));
+  return ccount;
+}
+
+// Find the earliest cycle as compared to right now
+static inline IRAM_ATTR uint32_t earliest(uint32_t a, uint32_t b) {
+    uint32_t now = GetCycleCountIRQ();
+    int32_t da = a - now;
+    int32_t db = b - now;
+    return (da < db) ? a : b;
+}
+
+// ----- @willmmiles begin patch -----
+// NMI crash workaround
+// Sometimes the NMI fails to return, stalling the CPU.  When this happens,
+// the next NMI gets a return address /inside the NMI handler function/.
+// We work around this by caching the last NMI return address, and restoring
+// the epc3 and eps3 registers to the previous values if the observed epc3
+// happens to be pointing to the _NMILevelVector function.
+extern void _NMILevelVector();
+extern void _UserExceptionVector_1(); // the next function after _NMILevelVector
+static inline IRAM_ATTR void nmiCrashWorkaround() {
+  static uintptr_t epc3_backup, eps3_backup;
+
+  uintptr_t epc3, eps3;
+  __asm__ __volatile__("rsr %0,epc3; rsr %1,eps3":"=a"(epc3),"=a" (eps3));
+  if ((epc3 < (uintptr_t) &_NMILevelVector) || (epc3 >= (uintptr_t) &_UserExceptionVector_1)) {
+    // Address is good; save backup
+    epc3_backup = epc3;
+    eps3_backup = eps3;
+  } else {
+    // Address is inside the NMI handler -- restore from backup
+    __asm__ __volatile__("wsr %0,epc3; wsr %1,eps3"::"a"(epc3_backup),"a"(eps3_backup));
+  }
+}
+// ----- @willmmiles end patch -----
+
+
+// The SDK and hardware take some time to actually get to our NMI code, so
+// decrement the next IRQ's timer value by a bit so we can actually catch the
+// real CPU cycle counter we want for the waveforms.
+
+// The SDK also sometimes is running at a different speed the the Arduino core
+// so the ESP cycle counter is actually running at a variable speed.
+// adjust(x) takes care of adjusting a delta clock cycle amount accordingly.
+#if F_CPU == 80000000
+  #define DELTAIRQ (microsecondsToClockCycles(9)/4)
+  #define adjust(x) ((x) << (turbo ? 1 : 0))
+#else
+  #define DELTAIRQ (microsecondsToClockCycles(9)/8)
+  #define adjust(x) ((x) >> 0)
+#endif
+
+// When the time to the next edge is greater than this, RTI and set another IRQ to minimize CPU usage
+#define MINIRQTIME microsecondsToClockCycles(6)
+
+static IRAM_ATTR void timer1Interrupt() {
+  // ----- @willmmiles begin patch -----
+  nmiCrashWorkaround();
+  // ----- @willmmiles end patch -----
+
+  // Flag if the core is at 160 MHz, for use by adjust()
+  bool turbo = (*(uint32_t*)0x3FF00014) & 1 ? true : false;
+
+  uint32_t nextEventCycle = GetCycleCountIRQ() + microsecondsToClockCycles(MAXIRQUS);
+  uint32_t timeoutCycle = GetCycleCountIRQ() + microsecondsToClockCycles(14);
+
+  if (wvfState.waveformToEnable || wvfState.waveformToDisable) {
+    // Handle enable/disable requests from main app
+    wvfState.waveformEnabled = (wvfState.waveformEnabled & ~wvfState.waveformToDisable) | wvfState.waveformToEnable; // Set the requested waveforms on/off
+    wvfState.waveformState &= ~wvfState.waveformToEnable;  // And clear the state of any just started
+    wvfState.waveformToEnable = 0;
+    wvfState.waveformToDisable = 0;
+    // No mem barrier.  Globals must be written to RAM on ISR exit.
+    // Find the first GPIO being generated by checking GCC's find-first-set (returns 1 + the bit of the first 1 in an int32_t)
+    wvfState.startPin = __builtin_ffs(wvfState.waveformEnabled) - 1;
+    // Find the last bit by subtracting off GCC's count-leading-zeros (no offset in this one)
+    wvfState.endPin = 32 - __builtin_clz(wvfState.waveformEnabled);
+  } else if (!pwmState.cnt && pwmState.pwmUpdate) {
+    // Start up the PWM generator by copying from the mailbox
+    pwmState.cnt = 1;
+    pwmState.idx = 1; // Ensure copy this cycle, cause it to start at t=0
+    pwmState.nextServiceCycle = GetCycleCountIRQ(); // Do it this loop!
+    // No need for mem barrier here.  Global must be written by IRQ exit
+  }
+
+  bool done = false;
+  if (wvfState.waveformEnabled || pwmState.cnt) {
+    do {
+      nextEventCycle = GetCycleCountIRQ() + microsecondsToClockCycles(MAXIRQUS);
+
+      // PWM state machine implementation
+      if (pwmState.cnt) {
+        int32_t cyclesToGo;
+        do {
+            cyclesToGo = pwmState.nextServiceCycle - GetCycleCountIRQ();
+            if (cyclesToGo < 0) {
+                if (pwmState.idx == pwmState.cnt) { // Start of pulses, possibly copy new
+                  if (pwmState.pwmUpdate) {
+                    // Do the memory copy from temp to global and clear mailbox
+                    pwmState = *(PWMState*)pwmState.pwmUpdate;
+                  }
+                  GPOS = pwmState.mask; // Set all active pins high
+                  if (pwmState.mask & (1<<16)) {
+                    GP16O = 1;
+                  }
+                  pwmState.idx = 0;
+                } else {
+                  do {
+                    // Drop the pin at this edge
+                    if (pwmState.mask & (1<<pwmState.pin[pwmState.idx])) {
+                      GPOC = 1<<pwmState.pin[pwmState.idx];
+                      if (pwmState.pin[pwmState.idx] == 16) {
+                        GP16O = 0;
+                      }
+                    }
+                    pwmState.idx++;
+                    // Any other pins at this same PWM value will have delta==0, drop them too.
+                  } while (pwmState.delta[pwmState.idx] == 0);
+                }
+                // Preserve duty cycle over PWM period by using now+xxx instead of += delta
+                cyclesToGo = adjust(pwmState.delta[pwmState.idx]);
+                pwmState.nextServiceCycle = GetCycleCountIRQ() + cyclesToGo;
+            }
+            nextEventCycle = earliest(nextEventCycle, pwmState.nextServiceCycle);
+        } while (pwmState.cnt && (cyclesToGo < 100));
+      }
+
+      for (auto i = wvfState.startPin; i <= wvfState.endPin; i++) {
+        uint32_t mask = 1<<i;
+
+        // If it's not on, ignore!
+        if (!(wvfState.waveformEnabled & mask)) {
+          continue;
+        }
+
+        Waveform *wave = &wvfState.waveform[i];
+        uint32_t now = GetCycleCountIRQ();
+
+        // Disable any waveforms that are done
+        if (wave->expiryCycle) {
+          int32_t expiryToGo = wave->expiryCycle - now;
+          if (expiryToGo < 0) {
+              // Done, remove!
+              if (i == 16) {
+                GP16O = 0;
+              } 
+              GPOC = mask;
+              wvfState.waveformEnabled &= ~mask;
+              continue;
+            }
+        }
+
+        // Check for toggles
+        int32_t cyclesToGo = wave->nextServiceCycle - now;
+        if (cyclesToGo < 0) {
+          uint32_t nextEdgeCycles;
+          uint32_t desired = 0;
+          uint32_t *timeToUpdate;
+          wvfState.waveformState ^= mask;
+          if (wvfState.waveformState & mask) {
+            if (i == 16) {
+              GP16O = 1;
+            }
+            GPOS = mask;
+
+            if (wvfState.waveformToChange & mask) {
+              // Copy over next full-cycle timings
+              wave->timeHighCycles = wvfState.waveformNewHigh;
+              wave->desiredHighCycles = wvfState.waveformNewHigh;
+              wave->timeLowCycles = wvfState.waveformNewLow;
+              wave->desiredLowCycles = wvfState.waveformNewLow;
+              wave->lastEdge = 0;
+              wvfState.waveformToChange = 0;
+            }
+            if (wave->lastEdge) {
+              desired = wave->desiredLowCycles;
+              timeToUpdate = &wave->timeLowCycles;
+            }
+            nextEdgeCycles = wave->timeHighCycles;
+          } else {
+            if (i == 16) {
+              GP16O = 0;
+            }
+            GPOC = mask;
+            desired = wave->desiredHighCycles;
+            timeToUpdate = &wave->timeHighCycles;
+            nextEdgeCycles = wave->timeLowCycles;
+          }
+          if (desired) {
+            desired = adjust(desired);
+            int32_t err = desired - (now - wave->lastEdge);
+            if (abs(err) < desired) { // If we've lost > the entire phase, ignore this error signal
+                err /= 2;
+                *timeToUpdate += err;
+            }
+          }
+          nextEdgeCycles = adjust(nextEdgeCycles);
+          wave->nextServiceCycle = now + nextEdgeCycles;
+          wave->lastEdge = now;
+        }
+        nextEventCycle = earliest(nextEventCycle, wave->nextServiceCycle);
+      }
+
+      // Exit the loop if we've hit the fixed runtime limit or the next event is known to be after that timeout would occur
+      uint32_t now = GetCycleCountIRQ();
+      int32_t cycleDeltaNextEvent = nextEventCycle - now;
+      int32_t cyclesLeftTimeout = timeoutCycle - now;
+      done = (cycleDeltaNextEvent > MINIRQTIME) || (cyclesLeftTimeout < 0);
+    } while (!done);
+  } // if (wvfState.waveformEnabled)
+
+  if (wvfState.timer1CB) {
+    nextEventCycle = earliest(nextEventCycle, GetCycleCountIRQ() + wvfState.timer1CB());
+  }
+
+  int32_t nextEventCycles = nextEventCycle - GetCycleCountIRQ();
+
+  if (nextEventCycles < MINIRQTIME) {
+    nextEventCycles = MINIRQTIME;
+  }
+  nextEventCycles -= DELTAIRQ;
+
+  // Do it here instead of global function to save time and because we know it's edge-IRQ
+  T1L = nextEventCycles >> (turbo ? 1 : 0);
+}
+
+};
diff --git a/platformio.ini b/platformio.ini
index 34cea4944f..5ebc43f559 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -202,6 +202,7 @@ lib_deps =
   #https://github.com/lorol/LITTLEFS.git
   ESPAsyncTCP @ 1.2.2
   ESPAsyncUDP
+  ESP8266PWM
   ${env.lib_deps}
 
 [esp32]
diff --git a/wled00/wled.cpp b/wled00/wled.cpp
index ec83d45831..41a2d6ea85 100644
--- a/wled00/wled.cpp
+++ b/wled00/wled.cpp
@@ -8,6 +8,8 @@
 #include "soc/rtc_cntl_reg.h"
 #endif
 
+extern "C" void usePWMFixedNMI();
+
 /*
  * Main WLED class implementation. Mostly initialization and connection logic
  */
@@ -408,6 +410,10 @@ void WLED::setup()
   DEBUG_PRINTF_P(PSTR("TX power: %d/%d\n"), WiFi.getTxPower(), txPower);
 #endif
 
+#ifdef ESP8266
+  usePWMFixedNMI(); // link the NMI fix
+#endif
+
 #if defined(WLED_DEBUG) && !defined(WLED_DEBUG_HOST)
   pinManager.allocatePin(hardwareTX, true, PinOwner::DebugOut); // TX (GPIO1 on ESP32) reserved for debug output
 #endif