Stereo Demo effect

examples/StereoSIDSimpleDemo/StereoSIDSimpleDemo.ino

@@ -0,0 +1,180 @@
+#include <SID.h>
+
+/************************************************************************
+
+        Arduino controls an
+	Atmega8 MOS6581 SID Emulator
+        by softare serial line
+        
+	( SID = Sound Interface Device )
+
+         random sound pitch example fro demostration of Stereo Effect
+ Sid voidce 2 is controlled by pin 10
+ The sketch push sound on channel 1 (pin9) and after 2 seconds on channel 2 (pin10)
+ 
+        
+
+
+****************************************************************************
+
+	date	authors					version		comment
+	======	======================	=======		==============================
+	2017 	Giovanni Giorgi         V1.0		First version based on
+                                                        Christoph Haberer implementation
+
+***************************************************************************/
+/***************************************************************************
+ *   
+ *   (c) 2007 Christoph Haberer, christoph(at)roboterclub-freiburg.de
+ *
+ ***************************************************************************
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation version 2 of the License,                *
+ *   If you extend the program please maintain the list of authors.        *
+ *   If you want to use this software for commercial purposes and you      *
+ *   don't want to make it open source, please contact the authors for     *
+ *   licensing.                                                            *
+ ***************************************************************************/
+#define OFF 0
+#define SETTRIANGLE_1	4,0x11,5,0xBB,6,0xAA,
+#define C4_1	1,0x11,0,0x25,
+#define CONTROLREG 4 // SID control register address
+
+// waveforms
+#define SETNOISE_1 	4,0x81,5,0xBB,6,0xAD, // SID register setup to create noise
+
+SID mySid;
+
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);  
+  mySid.begin();
+}
+
+/************************************************************************
+	
+    void setwaveform_noise(uint8_t channel)
+    
+    Set sid registers to create a noise waveform.
+    The SID has 3 channels, which should be accesed according to this
+    definition:
+    
+    #define CHANNEL1  0
+    #define CHANNEL2  7
+    #define CHANNEL3  14
+    
+    For noise sounds it makes sense to use only one channel, because 
+    using multiple channels gives almost no audible difference.
+    
+************************************************************************/
+void setwaveform_triangle(uint8_t channel)
+{
+  uint8_t dataset[]={ SETTRIANGLE_1 C4_1 0xFF };
+  //  uint8_t dataset[]={SETNOISE_1 C4_1 0xFF};
+  uint8_t n=0; 
+
+  while(dataset[n]!=0xFF) 
+  {
+     mySid.set_register(channel+dataset[n], dataset[n+1]); 
+     // register address, register content
+     n+=2;
+  }
+}
+
+  /************************************************************************
+	
+    void set_frequency(uint16_t pitch,uint8_t channel)
+    
+    Set sid frequncy registers.
+    
+    The pitch has to be:
+    
+    pitch=16.77*frequency
+    
+    The SID has 3 channels, which should be accesed according to this
+    definition:
+    
+    #define CHANNEL1  0
+    #define CHANNEL2  7
+    #define CHANNEL3  14
+    
+************************************************************************/
+// pitch=16.77*frequency
+void set_frequency(uint16_t pitch,uint8_t channel)
+{
+    mySid.set_register(channel, pitch&0xFF); // low register adress
+    mySid.set_register(channel+1, pitch>>8); // high register adress
+    }
+
+uint8_t zufall()
+{
+	static uint16_t startwert=0x0AA;
+
+	uint16_t temp;
+	uint8_t n;
+
+	for(n=1;n<8;n++)
+	{
+		temp = startwert;
+		startwert=startwert << 1;
+
+		temp ^= startwert;
+		if ( ( temp & 0x4000 ) == 0x4000 ) 
+		{ 
+			startwert |= 1;
+		}
+	}
+
+	return (startwert);
+}
+    #define CHANNEL1  0
+    #define CHANNEL2  7
+    #define CHANNEL3  14
+
+/************************************************************************
+	
+    main loop
+
+    create space ship noise
+    
+************************************************************************/        
+const int SECONDS_PERIOD=2;
+void loop()
+{
+  uint16_t n;
+  uint8_t flag,k;
+  uint16_t soundindex=0;
+
+
+
+  setwaveform_triangle(CHANNEL1);
+  setwaveform_triangle(CHANNEL2);
+
+  boolean switchChannel=false;
+  int c;
+  digitalWrite(LED_BUILTIN, HIGH);  
+  set_frequency(0,CHANNEL1);
+  set_frequency(0,CHANNEL2);
+  c=SECONDS_PERIOD*10;
+  while(--c>0)
+  {
+    n=zufall()*8;    
+    set_frequency(n*17,CHANNEL2); // Voce 2 Channel (pin10)
+    n=zufall()*2;    
+    delay(100);
+  } 
+  set_frequency(0,CHANNEL1);
+  set_frequency(0,CHANNEL2);
+  digitalWrite(LED_BUILTIN, LOW);  
+  // then invert 
+  c=SECONDS_PERIOD*10;
+  while(--c>0)
+  {
+    n=zufall()*8;    
+    set_frequency(n*17,CHANNEL1); // change noise generator frequency    
+    n=zufall()*2;    
+    delay(100);
+  }  
+
+}
+