Created
June 29, 2017 23:52
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ESP8266 (WEMOS D1) Zero Cross Triac using Timer0 (higher resolution/quality than Timer1)
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#define TIMR_OVRHD 7000 | |
uint8_t _z = 0; | |
uint32_t _v = 20000; | |
void ICACHE_RAM_ATTR _ISR0() { | |
if (_z == 1) { | |
_z = 2; | |
timer0_write(ESP.getCycleCount() + 8000); // 8000 = 100us, 80000 = 1ms | |
digitalWrite(D2, HIGH); | |
} | |
else if (_z == 2) { | |
digitalWrite(D2, LOW); | |
timer0_detachInterrupt(); // Must detach interrupt handler before next time it is attached to avoid ESP crash | |
_z = 0; | |
} | |
} | |
void ICACHE_RAM_ATTR _ZC() { | |
_z = 1; | |
timer0_attachInterrupt(_ISR0); // Attaching interrupt handler here avoids ESP crash | |
timer0_write(ESP.getCycleCount() + TIMR_OVRHD + _v); | |
} | |
void setup() { | |
Serial.begin(74880); | |
timer0_isr_init(); // Attaching the interrupt handler here causes the ESP to crash | |
pinMode(D2, OUTPUT); | |
digitalWrite(D2, LOW); | |
pinMode(D3, INPUT_PULLUP); | |
attachInterrupt(D3, _ZC, RISING); | |
Serial.printf("\n\n"); | |
} | |
uint32_t _t = millis(); | |
uint8_t _d = 1; | |
void loop() { | |
uint32_t t = millis(); | |
if (t - _t > 100) { | |
_v += _d ? 20000 : -20000; | |
if (_v == 20000 || _v == 640000) _d = !_d; | |
_t = t; | |
} | |
} |
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