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Teensy double speed interrupt

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This commit is contained in:
Asbelos 2021-05-16 21:00:34 +01:00
parent 955362a033
commit 8e71dd8926
2 changed files with 47 additions and 11 deletions
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1
.gitignore vendored
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@ -9,3 +9,4 @@ Release/*
config.h
.vscode/extensions.json
mySetup.h
myFilter.cpp

57
DCCTimer.cpp
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@ -95,30 +95,65 @@ INTERRUPT_CALLBACK interruptHandler=0;
#elif defined(TEENSYDUINO)
IntervalTimer myDCCTimer;
bool interruptFlipflop=false;
byte railcomPin[2]={0,0];
enum RAILCOM_NEXT:byte {SKIP,CUT_OUT,CUT_IN);
RAILCOM_NEXT railcom1Next[]={SKIP,SKIP};
void DCCTimer::begin(INTERRUPT_CALLBACK callback) {
interruptHandler=callback;
myDCCTimer.begin(interruptHandler, DCC_SIGNAL_TIME);
myDCCTimer.begin(interruptFast, DCC_SIGNAL_TIME/2);
}
// This interrupt happens every 29uS, and alternately calls the DCC waveform
// or handles any pending Railcom cutout pins.
void interruptFast() {
nterruptFlipflop=!interruptFlipflop;
if (interruptFiliflop) {
interruptHandler();
return;
}
// Railcom interrupt, half way between DCC interruots
for (byte channel=0;channel<2;channel++) {
byte pin=railcomPin[channel;
if (pin) {
switch (railcomNext[channel]) {
case CUT_OUT:
digitalWrite(pin,HIGH);
break;
case CUT_IN:
digitalWrite(pin,HIGH);
break;
case IGNORE: break;
}
railcomNext[channel]=IGNORE;
}
}
}
bool DCCTimer::isPWMPin(byte pin) {
//Teensy: digitalPinHasPWM, todo
(void) pin;
return false; // TODO what are the relevant pins?
return true; // We are so fast we can pretend we do support this
}
bool DCCTimer::isRailcomPin(byte pin) {
//Teensy: digitalPinHasPWM, todo
(void) pin;
return false; // TODO what are the relevant pins?
if (railcomPin[0]==0) railcomPin[0]=pin;
else if (railcomPin[1]==0) railcomPin[1]=pin;
else return false;
return true; // We are so fast we can pretend we do support this
}
void DCCTimer::setPWM(byte pin, bool high) {
// TODO what are the relevant pins?
(void) pin;
(void) high;
// setting pwm on a railcom pin is deferred to the next railcom interruyupt.
for (byte channel=0;channel<2;channel++) {
if (pin==railcomPin[channel]) {
railcomNext[channel]=high?CUT_OUT:CUT_IN;
return;
}
}
digitalWrite(pin,high?HIGH:LOW);
}
void DCCTimer::getSimulatedMacAddress(byte mac[6]) {