Add external PCM input.

CRIO.cpp

@@ -15,6 +15,7 @@ DigitalPin<coilOutPin> _coilOutPin(OUTPUT, LOW);
 DigitalPin<diagOutPin> _diagOutPin(OUTPUT, LOW);
 DigitalPin<speakerOutPin> _speakerOutPin(OUTPUT, LOW);
 
+
 CRIO::CRIO() : _remainingPulseUs(0), pw(pulseWindowUs), maxPitch(maxMidiPitch), breakoutUs(minBreakoutUs), _ticksSinceLastPulse(0), handlePulsePtr(&CRIO::handleNoPulse) {
 }
 
@@ -26,6 +27,10 @@ bool CRIO::fixedPulseEnabled() {
   return false;
 }
 
+bool CRIO::midiEnabled() {
+  return true;
+}
+
 inline void CRIO::pulseOn() {
   _speakerOutPin.high();
   _diagOutPin.high();
@@ -99,15 +104,23 @@ bool CRIO::pollPots() {
 void CRIO::updateLcd() {
 }
 
+void CRIO::updateLcdAll() {
+}
+
 void CRIO::updateCoeff() {
 }
 
 void CRIO::updateLcdCoeff() {
 }
 
+void CRIO::runPcm() {
+}
+
 #ifdef CR_UI
 DigitalPin<fixedVarPulseInPin> _fixedVarInPin(INPUT, LOW);
 DigitalPin<percussionEnableInPin> _percussionEnableInPin(INPUT, LOW);
+DigitalPin<pcmMidiInPin> _pcmMidiPin(INPUT, LOW);
+DigitalPin<pcmInPin> _pcmPin(INPUT, LOW);
 
 // TODO: Regular LCD library uses timers and isn't interruptable.
 #include "CRLiquidCrystal.h"
@@ -144,6 +157,10 @@ bool CRIOLcd::fixedPulseEnabled() {
   return _fixedVarInPin.read();
 }
 
+bool CRIOLcd::midiEnabled() {
+  return _pcmMidiPin.read();
+}
+
 inline cr_fp_t CRIOLcd::_scalePot(uint8_t pin) {
   uint16_t sample = analogRead(pin);
   sample = sample >> 2 << 2;
@@ -171,6 +188,25 @@ bool CRIOLcd::pollPots() {
   return false;
 }
 
+void CRIOLcd::updateLcdAll() {
+  for (byte i = 0; i < sizeof(_lcdBuffer); ++i) {
+    updateLcd();
+  }
+}
+
+void CRIOLcd::runPcm() {
+  memset(_lcdLine1, ' ', lcdWidth);
+  const char pcmDisplay[] = "PCM";
+  memcpy(_lcdLine1, pcmDisplay, sizeof(pcmDisplay));
+  updateLcdAll();
+  for (;;) {
+    pulseOff();
+    while (!_pcmPin.read()) {};
+    pulseOn();
+    while (_pcmPin.read()) {};
+  }
+}
+
 void CRIOLcd::updateLcd() {
   char c = _lcdBuffer[_lcdRow][_lcdCol];
   if (c == 0) {

CRIO.h

@@ -35,11 +35,16 @@ class CRIO {
   void schedulePulse(cr_fp_t pulseUs);
   virtual bool handlePulse();
   virtual void updateLcd();
+  virtual void updateLcdAll();
   virtual bool pollPots();
   virtual void updateCoeff();
   virtual void updateLcdCoeff();
   virtual bool percussionEnabled();
   virtual bool fixedPulseEnabled();
+  virtual bool midiEnabled();
+  virtual void runPcm();
+  void pulseOff();
+  void pulseOn();
   cr_fp_t pw;
   uint8_t maxPitch;
   cr_fp_t breakoutUs;
@@ -48,8 +53,6 @@ class CRIO {
   bool handleLongPulse();
   bool handlePulseOff();
   bool handleNoPulse();
-  void pulseOff();
-  void pulseOn();
   bool (CRIO::*handlePulsePtr)(void);
   cr_pulse_t _remainingPulseUs;
   uint16_t _ticksSinceLastPulse;
@@ -60,11 +63,14 @@ class CRIOLcd : public CRIO {
  public:
   CRIOLcd();
   void updateLcd() override;
+  void updateLcdAll() override;
   bool pollPots() override;
   void updateCoeff() override;
   void updateLcdCoeff() override;
   bool percussionEnabled() override;
   bool fixedPulseEnabled() override;
+  bool midiEnabled() override;
+  void runPcm() override;
  private:
   cr_fp_t _scalePot(uint8_t);
   char _lcdBuffer[lcdLines][lcdWidth+1];

chime_red2.ino

@@ -133,7 +133,11 @@ void enableMidi() {
 // cppcheck-suppress unusedFunction
 void setup() {
   resetAll();
+  if (!crio.midiEnabled()) {
+    crio.runPcm();
+  }
   enableMidi();
+  crio.updateLcdAll();
 }
 
 // cppcheck-suppress unusedFunction

pins.h

@@ -16,8 +16,10 @@
 const uint8_t coilOutPin = 11;
 const uint8_t diagOutPin = 12;
 const uint8_t speakerOutPin = 13;
+const uint8_t pcmInPin = 2;
 const uint8_t fixedVarPulseInPin = 32;
 const uint8_t percussionEnableInPin = 36;
+const uint8_t pcmMidiInPin = 44;
 
 const uint8_t lcd_d7 = 45;
 const uint8_t lcd_d6 = 43;