Add RC pin as brake pin

Author: habazut

DCCRMT.cpp

@@ -399,4 +399,25 @@ bool RMTChannel::addPin(byte pin, bool inverted) {
 bool RMTChannel::addPin(pinpair pins) {
   return addPin(pins.pin) && addPin(pins.invpin, true);
 }
+// and we can not yet take away what we giweth
+bool RMTChannel::addRCPin(int16_t brakePin) {
+  bool inverted = false;
+  if (brakePin<0) {
+    inverted = true;
+    brakePin = -brakePin;
+  }
+  if (brakePin == UNUSED_PIN)
+    return true;
+  // now we can work with brakePin
+  DIAG(F("Adding RC pin %d %s"), brakePin, inverted ? "inverted" : "");  
+  gpio_num_t gpioNum = (gpio_num_t)(brakePin);
+  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, PWM0_OUT0A_IDX, inverted, 0);
+  if (err != ESP_OK) return false;
+  return true;
+
+}
 #endif //ESP32

DCCRMT.h

@@ -35,6 +35,7 @@ class RMTChannel {
   RMTChannel(pinpair pins, bool isMain);
   bool addPin(byte pin, bool inverted=0);
   bool addPin(pinpair pins);
+  bool addRCPin(int16_t brakePin); // signed (inverted or not)
   void IRAM_ATTR RMTinterrupt();
   void RMTprefill();
   //int RMTfillData(dccPacket packet);

DCCWaveformRMT.cpp

@@ -54,8 +54,9 @@ void DCCWaveform::begin() {
       //DIAG(F("new MAIN channel with pins %d %d"), p.pin, p.invpin);
       rmtMainChannel = new RMTChannel(p, true); /* create new main channel */
     }
-//    int8_t brakePin = md->getBrakePinSigned();
-//    rmtMainChannel->addRC
+    int16_t brakePin = md->getBrakePinSigned();
+    // if RC and so on XXX 
+    rmtMainChannel->addRCPin(brakePin);
   }
   MotorDriver *md = TrackManager::getProgDriver();
   if (md) {