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turn off signal pin during cutout as that might switch some H-bridges between high and low side

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This commit is contained in:
Harald Barth 2022-05-17 08:06:10 +02:00
parent c9195f8035
commit 3f57c1210d
3 changed files with 32 additions and 3 deletions
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33
DCCTimer.cpp
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@ -227,6 +227,14 @@ void DCCTimer::read(uint8_t word, uint8_t *mac, uint8_t offset) {
TCNT4 = 0; // this timer fires half cycle after Timer 1 (no idea why /4 !)
#endif
// turn on PWM for the pins here (instead of in setPWM())
// only needed if RailCom is inactive as otherwise RailCom
// takes care of that. Does not hurt tough
onoffPWM(TIMER1_A_PIN, true);
onoffPWM(TIMER1_B_PIN, true);
#ifdef TIMER1_C_PIN
onoffPWM(TIMER1_C_PIN, true);
#endif
interrupts();
}
@ -253,19 +261,38 @@ void DCCTimer::read(uint8_t word, uint8_t *mac, uint8_t offset) {
false;
}
void DCCTimer::onoffPWM(byte pin, bool on) {
if (pin==TIMER1_A_PIN) {
if (on)
TCCR1A |= _BV(COM1A1);
else
TCCR1A &= ~(_BV(COM1A1));
}
else if (pin==TIMER1_B_PIN) {
if (on)
TCCR1A |= _BV(COM1B1);
else
TCCR1A &= ~(_BV(COM1B1));
}
#ifdef TIMER1_C_PIN
else if (pin==TIMER1_C_PIN) {
if (on)
TCCR1A |= _BV(COM1C1);
else
TCCR1A &= ~(_BV(COM1C1));
}
#endif
}
void DCCTimer::setPWM(byte pin, bool high) {
uint16_t val=high?1024:0;
if (pin==TIMER1_A_PIN) {
TCCR1A |= _BV(COM1A1);
OCR1A= val;
}
else if (pin==TIMER1_B_PIN) {
TCCR1A |= _BV(COM1B1);
OCR1B= val;
}
#ifdef TIMER1_C_PIN
else if (pin==TIMER1_C_PIN) {
TCCR1A |= _BV(COM1C1);
OCR1C= val;
}
#endif

1
DCCTimer.h
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@ -11,6 +11,7 @@ class DCCTimer {
static bool isPWMPin(byte pin);
static bool isRailcomPin(byte pin);
static void setPWM(byte pin, bool high);
static void onoffPWM(byte pin, bool on);
#if (defined(TEENSYDUINO) && !defined(__IMXRT1062__))
static void read_mac(byte mac[6]);
static void read(uint8_t word, uint8_t *mac, uint8_t offset);

1
MotorDriver.cpp
View File

@ -115,6 +115,7 @@ void MotorDriver::setBrake(bool on) {
}
void MotorDriver::setRailcomCutout(bool on) {
DCCTimer::onoffPWM(signalPin,!on);
DCCTimer::setPWM(brakePin,on ^ invertBrake);
}