D3N9: Demscene tribute on ChipKIT UNO32

D3N9.cpp

/*

D3N9: Old-Skool demoscene scroller for PIC32

*/

/* Kindly ripped from IOShield_OLED_Full_Demo */
#include <IOShieldOled.h>
#define  OLED  IOShieldOledClass
OLED  oled;

// Message to display.
char greetz[] = "*** Sine-wave text display for MPIDE/Uno32 *** Written by @indrora ***   Greetz go out to  ...  Quelab ... Digilent ... Microchip ... Arduino ... ben_zen ... #gaygeeks ... #c *** Don't forget to floss! " ;

// Max columns
#define COL_MAX IOShieldOled.colMax
// Number of chars out of the message we can display at any one time.
#define NUM_CHARS 16

// Macros. 
#define MIDDLE_X (oled.colMax/2)
#define MIDDLE_Y (oled.rowMax/2)

// Times through the loop we've been
int ticks = 1;

// Floating-point version of the map function from Arduino
float mapf(float x, float in_min, float in_max, float out_min, float out_max)
{
  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}


void setup() {

  // Init OLED.
  oled.begin();
  pinMode(2, INPUT); // forward/backward.
  pinMode(7, INPUT); // play/pause
  pinMode(8, INPUT); // Display text on HIGH
  pinMode(35, INPUT);// display starfield on HIGH
}
void loop() {

  
  // Clear the buffer, since we're drawing a frame.
  oled.clearBuffer();

  float phase = map(analogRead(A0), 0, 1023, 1,32);
  if(digitalRead(8) == HIGH)
  {
    // Draw text scroller.
    oled.setDrawMode(OLED::modeSet);
    for(int ix=0;ix<NUM_CHARS;ix++)
    {
      float pos = min( ( ( MIDDLE_Y-4)  + (sinf((float)(ticks+ix)/phase)*(float)(MIDDLE_Y)*0.75) ), 24 ) ;
      // This is a glorious hack.
      // c_char is ticks/phase + ix mod sizeof(greetz) -1
      // c_char now rotates gracefully through the string, looping when it needs to.
      char c_char = *(greetz + ((ticks/(int)phase) + ix) % sizeof(greetz)-1 );
      oled.moveTo(8*ix,pos);
      // putChar would, here, put it on the 4x16 grid. drawChar uses "graphic" characters.
      oled.drawChar(c_char);
    }
  }
  if(digitalRead(35) == HIGH)
  {
    // Draw the starfield behind.
    oled.setDrawMode(OLED::modeXor);
    for(int ix = 0;ix<24; ix++)
    {
      float x = mapf(ix,0,31 ,0,oled.colMax) ;
      // Some fun math.
      float y = mapf( sinf((cosf(2*ix)/24)*ticks), -1 , 1,0,oled.rowMax);
      // This should mix things up a touch.
      oled.moveTo( (int)(x*2) % (int)oled.colMax ,y );
      oled.drawPixel();
    }
  }
  // Now, what do we do /now/
  int dir = digitalRead(2);
  int go =  digitalRead(7);
  if(go != LOW)
  {
    if(dir != LOW)
      ticks++;
    else
      ticks--;
  }
  delay(64);
  // Pump the display. 
  oled.updateDisplay();
}