ESP8266TimerInterrupt (original) (raw)

I try to create a "glow" at certain intervals. Current design is that I loop through my sinus-table with 60 ms and do a analogWrite(), stop at the end of the sinus-loop, then wait some time and then rinse repeat. Looping the 60 ms does not work soooo well, as you already wrote.

To run more smoothly I thought of using the ESP8266Timer to switch the 60 ms-pwm change. For demonstration the restart is done in a simple ticker-loop().

All I get is nothing near a glow but watchdog resets. "analogWrite();" seems to be the offender.

#include "ESP8266TimerInterrupt.h"

#ifndef LED_BUILTIN
#define LED_BUILTIN       2         // Pin D4 mapped to pin GPIO2/TXD1 of ESP8266, NodeMCU and WeMoS, control on-board LED
#endif

const int sinus[] = {  0, 20, 45, 89, 134, 178, 221, 265, 308, 350, 391, 432,
                       472, 512, 550, 587, 623, 658, 691, 723, 754, 784,
                       812, 838, 863, 886, 907, 927, 945, 961, 976, 988,
                       999, 1007, 1014, 1019, 1022, 1023, 1023, 1023
                    };
const int sinuslen = sizeof(sinus) / sizeof(sinus[0]);
const int sinusschrittzeit = 60;
const long sinusdauer = sinusschrittzeit * sinuslen;

volatile int step = 0;
volatile int direction = 1;

ESP8266Timer ITimer;

void ICACHE_RAM_ATTR TimerHandler(void)
{
  analogWrite(LED_BUILTIN, sinus[step]);
  step += direction;
  if (step < 0) {
    step = 0;
    direction = 1;
    ITimer.disableTimer();
  }
  if (step > sinuslen - 1) {
    step = sinuslen - 1;
    direction = -1;
  }
}

void setup()
{
  Serial.begin(115200);
  while (!Serial);

  pinMode(LED_BUILTIN, OUTPUT);

  // Interval in microsecs
  if (ITimer.attachInterruptInterval(60L * 1000L, TimerHandler))
  {
    ITimer.disableTimer();
    Serial.println("\n\nStarting  ITimer OK");
  }
  else
    Serial.println("\n\nCan't set ITimer correctly. Select another freq. or interval");
}

void loop()
{
  static unsigned long ticker = 0;

  if  (millis() - ticker > 6000) {
    step = 0;
    direction = 1;
    ticker = millis();
    ITimer.enableTimer();
  }
}