11 files changed, 629 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..bf43616
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,5 @@
+main: main.c locate.c display.c vubars.c locate.h gm.h display.h vubars.h heuristics.c
+        gcc -O2 -o main main.c locate.c display.c vubars.c heuristics.c -l cwiid -lm -lSDL -lSDL_gfx
+
+clean:
+        rm main
diff --git a/display.c b/display.c
new file mode 100644
index 0000000..a4ac62b
--- /dev/null
+++ b/display.c
@@ -0,0 +1,63 @@
+#include <SDL/SDL.h>
+#include <SDL/SDL_gfxPrimitives.h>
+
+#include "display.h"
+
+static SDL_Surface *screen;
+static int g_width, g_height;
+
+void display_init( int width, int height) {
+  g_width = width;
+  g_height = height;
+
+  if (SDL_Init (SDL_INIT_EVERYTHING) == -1) {
+    fprintf( stderr, "Can't initialize SDL.\n" );
+    exit (1);
+  }
+
+  screen = SDL_SetVideoMode ( width, height, 24, SDL_SWSURFACE | SDL_DOUBLEBUF );
+  if( !screen ) {
+    fprintf( stderr, "Can't set video mode.\n" );
+    exit( 1 );
+  }
+
+  memset( screen->pixels, 0, width * height * 3 );
+  SDL_WM_SetCaption ( "GodMachine", "GodMachine" );
+
+}
+
+void display_clear( ) {
+//  rectangleColor( screen, 0, 0, g_width, g_height, 0 );
+
+  memset( screen->pixels, 0, g_width * g_height * 3 );
+  vlineColor( screen, g_width / 2, 0, g_height, 0xffffffff );
+  hlineColor( screen, 0, g_width, g_height / 2, 0xffffffff );
+}
+
+void display_circle( int wii_id, int x, int y, int w ) {
+  int xoff = ( wii_id & 1 ) * g_width / 2;
+  int yoff = ( wii_id >> 1 ) * g_height / 2;
+
+  filledCircleColor(screen, x + xoff, y + yoff, w, 0xffffffff );
+
+}
+
+void display_line( int wii_id, int x0, int y0, int x1, int y1 ) {
+  int xoff = ( wii_id & 1 ) * g_width / 2;
+  int yoff = ( wii_id >> 1 ) * g_height / 2;
+
+  aalineColor( screen, x0 + xoff, y0 + yoff, x1 + xoff, y1 + yoff, 0xffffffff );
+
+}
+
+void display_rectangle( int wii_id, int x, int y, int w, int h ) {
+  int xoff = ( wii_id & 1 ) * g_width / 2;
+  int yoff = ( wii_id >> 1 ) * g_height / 2;
+
+  boxColor( screen, x + xoff, y + yoff, x + xoff + w, y + yoff + h, 0xffffffff );
+
+}
+
+void display_redraw() {
+  SDL_Flip( screen );
+}
diff --git a/display.h b/display.h
new file mode 100644
index 0000000..2b2464f
--- /dev/null
+++ b/display.h
@@ -0,0 +1,6 @@
+void display_init( int width, int height);
+void display_redraw( );
+
+void display_clear( );
+void display_line( int wii_id, int x0, int y0, int x1, int y1 );
+void display_circle( int wii_id, int x, int y, int w );
diff --git a/gm.h b/gm.h
new file mode 100644
index 0000000..95b54f3
--- /dev/null
+++ b/gm.h
@@ -0,0 +1,5 @@
+typedef struct {
+  double x; double y;
+} wii_pt;
+
+#define WII_COUNT 4
diff --git a/heuristics.c b/heuristics.c
new file mode 100644
index 0000000..429a612
--- /dev/null
+++ b/heuristics.c
@@ -0,0 +1,111 @@
+#include <stdio.h>
+
+#include "vubars.h"
+
+static void heuristics_getGesture( int const amount, int const off, int const * const values,
+   int *dxl, int *dyl, int *dxr, int *dyr );
+
+int heuristics_getEnergy( int const amount, int const * const values ) {
+  int energy = 0;
+  int i;
+
+  for( i = 0; i < amount-1; ++i )
+    energy += values[i]*values[i+1];
+
+  return energy;
+}
+
+// Gets the two longest consecutive gestures found
+// in frames. -1 in off[ab] means no gesture found
+
+// Here what counts: the bigger abs(dx[ab]),   the longer the gesture
+//                   the bigger dy[ab]/dx[ab], the slower the gesture
+void heuristics_getGestures( int const amount, int const * const values,
+  int *offa, int *dxa, int *dya, int *dda,
+  int *offb, int *dxb, int *dyb, int *ddb )
+{
+  int    i, l = 0;
+  int dxl [ amount ], dyl [ amount ], dxr [ amount ], dyr [ amount ];
+
+  // Get the longest gestures for each point - both into left and rite
+  for( i=0; i<amount; ++i )
+    heuristics_getGesture( amount, i, values, dxl + i, dyl + i, dxr + i, dyr + i );
+
+  // "Sort" gesture by length
+  *offa = *dxa = *dya = 0;
+  for( i=0; i<amount; ++i ) {
+    if( dxr[ i ] > *dxa ) { *offa = i; *dxa = dxr[ i ]; *dya = dyr[ i ]; *dda = 1; }
+    if( dxl[ i ] > *dxa ) { *offa = i; *dxa = dxl[ i ]; *dya = dyl[ i ]; *dda =-1; }
+  }
+
+  // If no gesture found at all, invalidate off
+  // and return... second run wouldnt suddenly find a gesture
+  if( *dxa == 0 ) { *offa = *offb = -1; return; }
+
+  // Now clear the best result - this will find us the second best result
+  i = *offa;
+  if( *dda == 1 ) {
+    for( i=*offa; i < *offa + dxr[ *offa ]; ++i )
+      dxr[ i ] = 0;
+  } else {
+    for( i=*offa; i > *offa - dxl[ *offa ]; --i )
+      dxl[ i ] = 0;
+  }
+
+  // "Sort" remaining gestures by length
+  *offb = *dxb = *dyb = 0;
+  for( i=0; i<amount; ++i ) {
+    if( dxr[ i ] > *dxb ) { *offb = i; *dxb =  dxr[ i ]; *dyb = dyr[ i ]; *ddb = 1;}
+    if( dxl[ i ] > *dxb ) { *offb = i; *dxb = -dxl[ i ]; *dyb = dyl[ i ]; *ddb =-1;}
+  }
+
+  // If no secondary gesture found, invalidate off
+  if( *dxb == 0 ) *offb = -1;
+}
+
+static void heuristics_getGesture( int const amount, int const off, int const * const values,
+   int * const dxl, int * const dyl, int * const dxr, int * const dyr )
+{
+  int i;
+
+  // Initialize as "nothing happened"
+  *dxl = *dxr = *dyl = *dyr = 0;
+
+  // if this didn't peak in last frame, we're not starting
+  // a gesture here.
+  if( values[off] != VU_PEAK ) return;
+
+  if( off > 0 )        *dyl = values[off]-values[off-1];
+  if( off < amount-1 ) *dyr = values[off]-values[off+1];
+
+  if( !*dyl && !*dyr ) return;
+
+  // Depending on where this peaks seems to have come from,
+  // chose direction where to follow it
+  // try to collect enough monotonic samples and calculate a
+  // slope. Since our sample peaks, all others cant be larger 
+  if( (*dyl) && (*dyl < *dyr) ) {
+    (*dxl)++;
+    for( i=off-1; i>=0; --i ) {
+      int dy = values[i+1] - values[i];
+
+      // If it scrolled out of scope, ignore it
+      if( !values[i] || dy < 0 ) break;
+
+      (*dxl)++;
+      (*dyl) += dy;
+    }
+  } else {
+    (*dxr)++;
+    // Do the same when going right
+    for( i=off+1; i<amount; ++i ) {
+      int dy = values[i-1] - values[i];
+
+      // If it scrolled out of scope, ignore it
+      if( !values[i] || dy < 0 ) break;
+
+      (*dxr)++;
+      (*dyr) += dy;
+    }
+  }
+}
diff --git a/heuristics.h b/heuristics.h
new file mode 100644
index 0000000..a01d1f7
--- /dev/null
+++ b/heuristics.h
@@ -0,0 +1,13 @@
+// Gets the two longest consecutive gestures found
+// in frames. -1 in off[ab] means no gesture found
+
+// Here what counts: the bigger abs(dx[ab]),   the longer the gesture
+//                   the bigger dy[ab]/dx[ab], the slower the gesture
+void heuristics_getGestures( int const amount, int const * const values,
+  int *offa, int *dxa, int *dya, int *dda,
+  int *offb, int *dxb, int *dyb, int *ddb );
+
+// Calculate an "energy" level contained in vu bars.
+// to soften spikes, we correlate neighbouring bars
+int heuristics_getEnergy( int const amount, int const * const values );
+
diff --git a/locate.c b/locate.c
new file mode 100644
index 0000000..1d3ec72
--- /dev/null
+++ b/locate.c
@@ -0,0 +1,91 @@
+#include <math.h>
+#include <stdio.h>
+
+#include "gm.h"
+
+static wii_pt bounds[2][4];
+static int    g_calibrated[4];
+
+double get_dist( wii_pt *p1, wii_pt *p2 ) {
+  double d = (p1->x - p2->x)*(p1->x - p2->x) +
+             (p1->y - p2->y)*(p1->y - p2->y);
+  return sqrt(d);
+}
+
+/* This call stores information about the expected
+   rectangle for each wii
+*/
+void wii_calibrate( int wii_id, wii_pt *coords ) {
+  double max_dist = 0.0;
+  int pt1 = 0, pt2 = 0, i, j;
+
+  /* Points with maximal distance span a rectangle */
+  for( i=0; i<4; ++i )
+    for( j=1; j<4; ++j ) { 
+      double dist = get_dist( coords+i, coords+j );
+      if( dist > max_dist ) {
+        pt1 = i; pt2 = j; 
+        max_dist = dist;
+      }
+    }
+
+  if( coords[pt1].x > coords[pt2].x ) {
+    bounds[0][wii_id] = coords[pt1];
+    bounds[1][wii_id] = coords[pt2];
+  } else {
+    bounds[1][wii_id] = coords[pt1];
+    bounds[0][wii_id] = coords[pt2];
+  }
+
+  g_calibrated[wii_id] = 1;
+}
+
+int wii_point_to_led( int wii_id, wii_pt *coords ) {
+  // Ick nenn die immer so.
+  const double x0 = bounds[0][wii_id].x;
+  const double y0 = bounds[0][wii_id].y;
+  const double x1 = bounds[1][wii_id].x;
+  const double y1 = bounds[1][wii_id].y;
+  const double xp = coords->x;
+  const double yp = coords->y;
+
+//printf( "%lf:%lf ", xp, yp );
+
+  // Where m is slope of orthogonal line
+  // And n is square of diagonal of bounding box
+  double m = (x1-x0)*(xp-x0)+(y1-y0)*(yp-y0);
+  double n = (x1-x0)*(x1-x0)+(y1-y0)*(y1-y0);
+
+  // To find out distance of coord to our base line
+  double q = (xp-x0)*(y1-y0)-(yp-y0)*(x1-x0);
+
+//printf( "%lf %lf %lf\n", m, n, q );
+
+  double offs_on_line = m/n;
+  double dist_to_line = q/n;
+
+  // If wii is not calibrated, we cannot detect point
+  if( !g_calibrated[wii_id] )
+    return -1;
+
+  // Point is too far away to be considered a match
+  if( ( dist_to_line > 0.1 ) || ( dist_to_line < -0.1 ) ) {
+//    puts( "too far " );
+    return -1;
+  }
+
+//  printf( "%1.3lf\n", offs_on_line );
+
+  // Check, which segment our line hits
+  if( ( offs_on_line > (-1.0/6.0) ) && ( offs_on_line <= (1.0/6.0) ) )
+    return 0;
+  if( ( offs_on_line > ( 1.0/6.0) ) && ( offs_on_line <= (3.0/6.0) ) )
+    return 1;
+  if( ( offs_on_line > ( 3.0/6.0) ) && ( offs_on_line <= (5.0/6.0) ) )
+    return 2;
+  if( ( offs_on_line > ( 5.0/6.0) ) && ( offs_on_line <= (7.0/6.0) ) )
+    return 3;
+
+  // No match!
+  return -1;
+}
diff --git a/locate.h b/locate.h
new file mode 100644
index 0000000..0b72f72
--- /dev/null
+++ b/locate.h
@@ -0,0 +1,9 @@
+#ifndef _WII_LOCATE_H_
+#define _WII_LOCATE_H_
+
+#include "gm.h"
+
+void wii_calibrate( int wii_id, wii_pt *coords );
+int wii_point_to_led( int wii_id, wii_pt *coords );
+
+#endif
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..e645b48
--- /dev/null
+++ b/main.c
@@ -0,0 +1,172 @@
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <time.h>
+
+#include <cwiid.h>
+#include "gm.h"
+#include "display.h"
+
+/* Our wii's bluetooth and wii handles */
+static bdaddr_t g_bdaddr[4];
+static cwiid_wiimote_t *g_wiimotes[4];
+static int g_num_controls = 0;
+static int g_samples_received = 0;
+static uint32_t g_starttime;
+
+static volatile int g_redraw_lock = 0;
+
+static const int g_width = 400, g_height = 300;
+
+cwiid_mesg_callback_t cwiid_callback;
+cwiid_err_t err;
+void err(cwiid_wiimote_t *wiimote, const char *s, va_list ap)
+{
+  if (wiimote) printf("%d:", cwiid_get_id(wiimote)); else printf("-1:");
+  vprintf(s, ap);
+  printf("\n");
+}
+
+int main( int argc, char **argv ) {
+  int LEDs[4] = { CWIID_LED1_ON,  CWIID_LED1_ON | CWIID_LED2_ON,
+                  CWIID_LED1_ON | CWIID_LED2_ON | CWIID_LED3_ON,
+                  CWIID_LED1_ON | CWIID_LED2_ON | CWIID_LED3_ON | CWIID_LED4_ON };
+  int i;
+  struct timeval now;
+
+  signal( SIGINT, exit );
+  display_init( g_width, g_height);
+
+  cwiid_set_err(err);
+
+  /* If no bdaddrs given on command line, just connect to
+     first visible wii */
+  if( argc <= 1 ) {
+    char bt_out[64];
+    g_bdaddr[0] = *BDADDR_ANY;
+
+    while( !(g_wiimotes[g_num_controls] = cwiid_open( &g_bdaddr[0], 0 )))
+      fprintf( stderr, "Unable to connect to wiimote\n" );
+
+    ba2str( &g_bdaddr[0], bt_out );
+    fprintf( stderr, "Connected to wiimote %i (BT-Addr: %s)\n", i, bt_out );
+    g_num_controls++;
+  }
+
+  /* ... else try to reach every single wii */
+  for( i=0; i<argc-1; ++i ) {
+    str2ba(argv[i+1], &g_bdaddr[i]);
+
+    while( !(g_wiimotes[g_num_controls] = cwiid_open( &g_bdaddr[i], 0 )))
+      fprintf( stderr, "Unable to connect to wiimote %i (BT-Addr: %s)\n", i, argv[i+1] );
+
+    g_num_controls++;
+    fprintf( stderr, "Connected to wiimote %i (BT-Addr: %s)\n", i, argv[i+1] );
+  }
+
+  for( i=0; i<g_num_controls; ++i ) {
+    if (cwiid_set_mesg_callback(g_wiimotes[i], cwiid_callback)) {
+      fprintf(stderr, "Unable to set message callback\n");
+      return -1;
+    }
+
+    /* Set report mode to IR */
+    cwiid_set_rpt_mode(g_wiimotes[i], CWIID_RPT_IR);
+
+    /* Enable call back */
+    cwiid_enable(g_wiimotes[i], CWIID_FLAG_MESG_IFC);
+
+    /* Reflect number in leds */
+    cwiid_set_led(g_wiimotes[i], LEDs[i]);
+  }
+
+  gettimeofday(&now, (struct timezone *)NULL);
+  g_starttime = now.tv_sec * 1000 + now.tv_usec / 1000; /* in ms */
+
+  /* Spin and let call back do all the work */
+  while( 1 ) {
+    if( ! (++i & 0xffff ) ) {
+      int wii_id, led;
+      while( g_redraw_lock );
+
+      for( wii_id=0; wii_id<4; ++wii_id )
+        for( led = 0; led<4; ++led )
+          display_rectangle( wii_id, led * g_width / 16, 0, g_width / 16, vubars_getinfo(wii_id, led)/2 );
+
+      display_redraw();
+      usleep( 1000 );
+      vubars_reduce();
+      display_rectangle( 2, g_width/2-10,    0, 20, -vubars_getweather()/2 );
+      display_rectangle( 2, g_width/2-15, -128, 30, 1 );
+      display_rectangle( 2, g_width/2-15,  -64, 30, 1 );
+    }
+  }
+
+  return 0;
+}
+
+void cwiid_callback(cwiid_wiimote_t *wiimote, int mesg_count,
+                    union cwiid_mesg mesg[], struct timespec *timestamp)
+{
+  int i, j, k, wii_id, ledmask;
+  int valid_sources;
+  struct timeval now;
+  uint32_t runtime;
+  wii_pt coords[4];
+
+  gettimeofday(&now, (struct timezone *)NULL);
+  runtime = now.tv_sec * 1000 + now.tv_usec / 1000 - g_starttime; /* in ms */
+
+  for( i=0; i<g_num_controls; ++i ) {
+    if( wiimote == g_wiimotes[i] )
+      wii_id = i;
+  }
+  g_redraw_lock = 1;
+  display_clear();
+  g_samples_received++;
+  for (i=0; i < mesg_count; i++) {
+    switch (mesg[i].type) {
+
+    case CWIID_MESG_IR:
+//      printf("IR Report (%i): ", wii_id );
+//      printf("(%ld Hz) ", ( g_samples_received * 1000 ) / runtime );
+
+      valid_sources = 0;
+      for (j = 0; j < CWIID_IR_SRC_COUNT; j++) {
+        if (mesg[i].ir_mesg.src[j].valid) {
+          coords[valid_sources].x = (double)mesg[i].ir_mesg.src[j].pos[CWIID_X];
+          coords[valid_sources].y = (double)mesg[i].ir_mesg.src[j].pos[CWIID_Y];
+
+          display_circle( wii_id, coords[valid_sources].x / 5.0, coords[valid_sources].y / 5.0, 6 );
+          valid_sources++;
+//          printf("(%d,%d) ", mesg[i].ir_mesg.src[j].pos[CWIID_X],
+//                             mesg[i].ir_mesg.src[j].pos[CWIID_Y]);
+        }
+      }
+
+      if (!valid_sources) {
+//        printf("no sources detected");
+      }
+
+      if( valid_sources == 4 ) {
+        wii_calibrate( wii_id, coords );
+      }
+
+      ledmask = 0;
+      for( j=0; j<valid_sources; ++j ) {
+        int led = wii_point_to_led( wii_id, coords+j );
+        ledmask |= 1<<led;
+      }
+      for( j=0; j<4; ++j ) {
+        vubars_peak( wii_id, j, ( ledmask >> j ) & 1 );
+      }
+
+      break;
+    default:
+      break;
+    }
+  }
+  g_redraw_lock = 0;
+}
+
diff --git a/vubars.c b/vubars.c
new file mode 100644
index 0000000..8fcf081
--- /dev/null
+++ b/vubars.c
@@ -0,0 +1,148 @@
+#include <stdio.h>
+#include <math.h>
+
+#include "gm.h"
+#include "vubars.h"
+#include "heuristics.h"
+
+// This is our current idea of how we want to influence the weather
+// 128 means: do nothing at all
+// 
+// We want to default to softening the weather, so our value always
+// flows back towards 100
+static double vu_value_main       = 100.0;
+static double vu_value_softening  = 0.0;
+static double vu_value_activating = 0.0;
+
+static int wii_last[WII_COUNT * 4];
+static int wii_bars[WII_COUNT * 4];
+
+int vubars_peak( int wii_id, int led, int is_on ) {
+  if( is_on ) {
+    wii_last[wii_id*4+led] = 0;
+  } else {
+    if( ++wii_last[wii_id*4+led] == 1 )
+      wii_bars[wii_id*4+led] = VU_PEAK;
+  }
+}
+
+int vubars_getinfo( int wii_id, int led ) {
+  return wii_bars[wii_id*4+led];
+}
+
+int vubars_getweather( ) {
+  return (int)vu_value_main;
+}
+
+static int GESTURE_A_dd  = 0;
+static int GESTURE_A_dx  = 0;
+static int GESTURE_A_dy  = 0;
+
+static int GESTURE_A_off = 0;
+static int GESTURE_A_ttl = 0;
+
+static int GESTURE_B_dd  = 0;
+static int GESTURE_B_dx  = 0;
+static int GESTURE_B_dy  = 0;
+
+static int GESTURE_B_off = 0;
+static int GESTURE_B_ttl = 0;
+
+static void match_gesture( int off, int dx, int dy, int dd ) {
+  if( ( GESTURE_A_dd == dd ) && ( GESTURE_A_off == off + dd ) ) {
+    printf( "...continued A\n" );
+
+    GESTURE_A_off = off;
+    GESTURE_A_dx  = dx;
+    GESTURE_A_dy  = dy;
+    GESTURE_A_ttl = VU_PEAK;
+
+  } else if ( ( GESTURE_B_dd == dd ) && ( GESTURE_B_off == off + dd ) ) {
+    printf( "...continued B\n" );
+
+    GESTURE_B_off = off;
+    GESTURE_B_dx  = dx;
+    GESTURE_B_dy  = dy;
+    GESTURE_B_ttl = VU_PEAK;
+
+  } else {
+    printf( "\n" );
+
+    if( GESTURE_B_ttl >= GESTURE_A_ttl ) {
+      GESTURE_A_off = off;
+      GESTURE_A_dd  = dd;
+      GESTURE_A_dx  = dx;
+      GESTURE_A_dy  = dy;
+      GESTURE_A_ttl = VU_PEAK;
+    } else {
+      GESTURE_B_off = off;
+      GESTURE_B_dd  = dd;
+      GESTURE_B_dx  = dx;
+      GESTURE_B_dy  = dy;
+      GESTURE_B_ttl = VU_PEAK;
+    }
+  }
+}
+
+void vubars_reduce() {
+  int i;
+  double diff;
+
+  // First do some heuristics voodoo
+  int offa, offb, dxa, dxb, dya, dyb, dda, ddb;
+
+  heuristics_getGestures( 16, wii_bars, &offa, &dxa, &dya, &dda, &offb, &dxb, &dyb, &ddb );
+
+  if( ( offa != -1 ) && ( dxa > 2 ) ) {
+    printf( "1mary gesture detected: offset: % 2d direction: %s len: % 2d speed: %lf",
+            offa, dda < 0 ? "left" : "rite", dxa, (double)dya / (double)dxa );
+    match_gesture( offa, dxa, dya, dda );
+  }
+  
+
+  if( ( offb != -1 ) && ( dxb > 2 ) ) {
+    printf( "2ndry gesture detected: offset: % 2d direction: %s len: % 2d speed: %lf\n",
+            offb, ddb < 0 ? "left" : "rite", dxb, (double)dyb / (double)dxb );
+    match_gesture( offb, dxb, dyb, ddb );
+  }
+
+  // Have two gestures living at one
+  if( GESTURE_A_ttl && GESTURE_B_ttl ) {
+    if( GESTURE_A_dd == GESTURE_B_dd ) {
+//      printf( "Two gestures pointing into the same direction.\n" );
+    } else {
+      // The more interesting case: hands move into opposite directions
+      if( GESTURE_A_dd == -1 ) {
+         if ( GESTURE_A_off < GESTURE_B_off )
+           printf( "Slower! (Case 1)\n" );
+         else
+           printf( "Faster! (Case 2)\n" );
+      } else {
+         if ( GESTURE_A_off < GESTURE_B_off )
+           printf( "Faster! (Case 3)\n" );
+         else
+           printf( "Slower! (Case 4)\n" );
+      }
+    }
+  }
+
+  // Now try to modify the weather by using values from our vu-bars
+  diff = (double)heuristics_getEnergy( 16, wii_bars );
+  vu_value_main += diff / 40000.0;
+
+  diff = vu_value_main - 100.0;
+  if( diff<0 ) diff = -diff;
+  diff = sqrt( diff );
+
+  if( vu_value_main > 100.0 ) diff = -diff;
+
+  vu_value_main += diff;
+
+  for( i=0; i<WII_COUNT*4; ++i )
+    if( wii_bars[i] )
+      wii_bars[i]-=VU_STEP;
+
+  if( GESTURE_A_ttl ) GESTURE_A_ttl -= VU_STEP;
+  if( GESTURE_B_ttl ) GESTURE_B_ttl -= VU_STEP;
+
+}
diff --git a/vubars.h b/vubars.h
new file mode 100644
index 0000000..8cca6b8
--- /dev/null
+++ b/vubars.h
@@ -0,0 +1,6 @@
+static unsigned long const VU_STEP = 10;
+static unsigned long const VU_PEAK = 400;
+
+int  vubars_peak( int wii_id, int led, int is_on );
+void vubars_reduce();
+int  vubars_getweather();