Send inverted signal (DCC and DC mode) on ESP32 if signalPin2 defined in MotorDriver

DCCRMT.cpp

@@ -69,7 +69,7 @@ void IRAM_ATTR interrupt(rmt_channel_t channel, void *t) {
   if (tt) tt->RMTinterrupt();
 }
 
-RMTChannel::RMTChannel(byte pin, bool isMain) {
+RMTChannel::RMTChannel(pinpair pins, bool isMain) {
   byte ch;
   byte plen;
   if (isMain) {
@@ -119,13 +119,14 @@ RMTChannel::RMTChannel(byte pin, bool isMain) {
   config.rmt_mode = RMT_MODE_TX;
   config.channel = channel = (rmt_channel_t)ch;
   config.clk_div = RMT_CLOCK_DIVIDER;
-  config.gpio_num = (gpio_num_t)pin;
+  config.gpio_num = (gpio_num_t)pins.pin;
   config.mem_block_num = 2; // With longest DCC packet 11 inc checksum (future expansion)
                             // number of bits needed is 22preamble + start +
                             // 11*9 + extrazero + EOT = 124
                             // 2 mem block of 64 RMT items should be enough
 
   ESP_ERROR_CHECK(rmt_config(&config));
+  addPin(pins.invpin, true);
   /*
   // test: config another gpio pin
   gpio_num_t gpioNum = (gpio_num_t)(pin-1);
@@ -213,14 +214,19 @@ void IRAM_ATTR RMTChannel::RMTinterrupt() {
     dataRepeat--;
 }
 
-bool RMTChannel::addPin(byte pin) {
+bool RMTChannel::addPin(byte pin, bool inverted) {
+  if (pin == UNUSED_PIN)
+    return true;
   gpio_num_t gpioNum = (gpio_num_t)(pin);
   esp_err_t err;
   PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[gpioNum], PIN_FUNC_GPIO);
   err = gpio_set_direction(gpioNum, GPIO_MODE_OUTPUT);
   if (err != ESP_OK) return false;
-  gpio_matrix_out(gpioNum, RMT_SIG_OUT0_IDX+channel, 0, 0);
+  gpio_matrix_out(gpioNum, RMT_SIG_OUT0_IDX+channel, inverted, 0);
   if (err != ESP_OK) return false;
   return true;
 }
+bool RMTChannel::addPin(pinpair pins) {
+  return addPin(pins.pin) && addPin(pins.invpin, true);
+}
 #endif //ESP32

DCCRMT.h

@@ -23,6 +23,7 @@
 #include "driver/rmt.h"
 #include "soc/rmt_reg.h"
 #include "soc/rmt_struct.h"
+#include "MotorDriver.h" // for class pinpair
 
 // make calculations easy and set up for microseconds
 #define RMT_CLOCK_DIVIDER 80
@@ -31,8 +32,9 @@
 
 class RMTChannel {
  public:
-  RMTChannel(byte pin, bool isMain);
+  RMTChannel(pinpair pins, bool isMain);
-  bool addPin(byte pin);
+  bool addPin(byte pin, bool inverted=0);
+  bool addPin(pinpair pins);
   void IRAM_ATTR RMTinterrupt();
   void RMTprefill();
   //int RMTfillData(dccPacket packet);

DCCWaveform.cpp

@@ -211,22 +211,24 @@ DCCWaveform::DCCWaveform(byte preambleBits, bool isMain) {
 }
 void DCCWaveform::begin() {
   for(const auto& md: TrackManager::getMainDrivers()) {
+    pinpair p = md->getSignalPin();
     if(rmtMainChannel) {
-      DIAG(F("added pin %d to MAIN channel"), md->getSignalPin());
+      DIAG(F("added pins %d %d to MAIN channel"), p.pin, p.invpin);
-      rmtMainChannel->addPin(md->getSignalPin()); // add pin to existing main channel
+      rmtMainChannel->addPin(p); // add pin to existing main channel
     } else {
-      DIAG(F("new MAIN channel with pin %d"), md->getSignalPin());
+      DIAG(F("new MAIN channel with pins %d %d"), p.pin, p.invpin);
-      rmtMainChannel = new RMTChannel(md->getSignalPin(), true); /* create new main channel */
+      rmtMainChannel = new RMTChannel(p, true); /* create new main channel */
     }
   }
   MotorDriver *md = TrackManager::getProgDriver();
   if (md) {
+    pinpair p = md->getSignalPin();
     if (rmtProgChannel) {
-      DIAG(F("added pin %d to PROG channel"), md->getSignalPin());
+      DIAG(F("added pins %d %d to PROG channel"), p.pin, p.invpin);
-      rmtProgChannel->addPin(md->getSignalPin()); // add pin to existing prog channel
+      rmtProgChannel->addPin(p); // add pin to existing prog channel
     } else {
-      DIAG(F("new PROGchannel with pin %d"), TrackManager::getProgDriver()->getSignalPin());
+      DIAG(F("new PROGchannel with pins %d %d"), p.pin, p.invpin);
-      rmtProgChannel = new RMTChannel(TrackManager::getProgDriver()->getSignalPin(), false);
+      rmtProgChannel = new RMTChannel(p, false);
     }
   }
 }

MotorDriver.h

@@ -77,6 +77,16 @@
 #define UNUSED_PIN 127 // inside int8_t
 #endif
 
+class pinpair {
+public:
+  pinpair(byte p1, byte p2) {
+    pin = p1;
+    invpin = p2;
+  };
+  byte pin = UNUSED_PIN;
+  byte invpin = UNUSED_PIN;
+};
+
 #if defined(__IMXRT1062__) || defined(ARDUINO_ARCH_ESP8266) || defined(ARDUINO_ARCH_ESP32) || defined(ARDUINO_ARCH_SAMD) || defined(ARDUINO_ARCH_STM32)
 typedef uint32_t portreg_t;
 #else
@@ -134,7 +144,7 @@ class MotorDriver {
       else
 	pinMode(signalPin, INPUT);
     };
-    inline byte getSignalPin() { return signalPin; };
+    inline pinpair getSignalPin() { return pinpair(signalPin,signalPin2); };
     virtual void setDCSignal(byte speedByte);
     inline void detachDCSignal() {
 #ifndef ARDUINO_ARCH_ESP32

TrackManager.cpp

@@ -140,8 +140,15 @@ bool TrackManager::setTrackMode(byte trackToSet, TRACK_MODE mode, int16_t dcAddr
 
 #ifdef ARDUINO_ARCH_ESP32
     // remove pin from MUX matrix and turn it off
-    DIAG(F("Track=%c remove pin %d"),trackToSet+'A', track[trackToSet]->getSignalPin());
+    pinpair p = track[trackToSet]->getSignalPin();
-    gpio_reset_pin((gpio_num_t)track[trackToSet]->getSignalPin());
+    DIAG(F("Track=%c remove  pin %d"),trackToSet+'A', p.pin);
+    gpio_reset_pin((gpio_num_t)p.pin);
+    pinMode(p.pin, OUTPUT); // gpio_reset_pin may reset to input
+    if (p.invpin != UNUSED_PIN) {
+      DIAG(F("Track=%c remove ^pin %d"),trackToSet+'A', p.invpin);
+      gpio_reset_pin((gpio_num_t)p.invpin);
+      pinMode(p.invpin, OUTPUT); // gpio_reset_pin may reset to input
+    }
 #endif
     if (mode==TRACK_MODE_PROG) {
       // only allow 1 track to be prog