add technical documentation

game-ctrl/buttons.c

@@ -8,6 +8,7 @@
 #include "shapes.h"
 #include "canvas.h"
 #include "sound.h"
+#include "eeprom.h"
 
 
 bool mutedFlag = true;
@@ -84,27 +85,22 @@ void buttonsExec(void *handle) {
 
   if (buttonsMoveLeftPressed()) {
     stoneMoveLeft();
-    soundCtrl(SOUND_MOTION);
     buttonPressed = 1;
   }
   if (buttonsMoveRightPressed()) {
     stoneMoveRight();
-    soundCtrl(SOUND_MOTION);
     buttonPressed = 1;
   }
   if (buttonsRotateLeftPressed()) {
     stoneRotateLeft();
-    soundCtrl(SOUND_MOTION);
     buttonPressed = 1;
   }
   if (buttonsRotateRightPressed()) {
     stoneRotateRight();
-    soundCtrl(SOUND_MOTION);
     buttonPressed = 1;
   }
   if (buttonsMoveDownPressed()) {
     stoneMoveDown();
-    soundCtrl(SOUND_MOTION);
     buttonPressed = 1;
   }
 
@@ -112,6 +108,7 @@ void buttonsExec(void *handle) {
     canvasShow();
 
     if (mutedFlag) {
+      eepromIncGameCounter();
       soundCtrl(SOUND_UNMUTE);
       mutedFlag = false;
     }

game-ctrl/config.c

@@ -7,19 +7,24 @@
 #include "eeprom.h"
 #include "display.h"
 #include "shapes.h"
+#include "sound.h"
 
 
 static bool configChanged = false;
+static bool muted = false;
 
 static void configHandleFlash() {
+  uint8_t color = eepromReadFlashColor();
+
+  canvasFillRow(CANVAS_HEIGHT-1, color);
+  displaySetValue(color);
+
   if (buttonsConfig2Pressed()) {
     configChanged = true;
-    uint8_t color = eepromReadFlashColor() + 1;
+    color += 1;
     if (color > _color_end) {
       color = 0;
     }
-    canvasFillRow(CANVAS_HEIGHT-1, color);
-    displaySetValue(color);
     eepromSetFlashColor(color);
   }
 }
@@ -33,8 +38,18 @@ static void configHandleResetHighScore() {
   }
 }
 
+static void configHandleResetGameCounter() {
+  displaySetValue(eepromReadGameCounter());
+
+  if (buttonsConfig2Pressed()) {
+    configChanged = true;
+    eepromClearGameCounter(0);
+  }
+}
+
 static void configHandleBrightness() {
   displaySetValue(eepromReadBrightness());
+  stoneDrawConfigPattern();
 
   if (buttonsConfig2Pressed()) {
     configChanged = true;
@@ -43,13 +58,35 @@ static void configHandleBrightness() {
       brightness = 0;
     }
     eepromSetBrightness(brightness);
-
-    stoneDrawConfigPattern();
   }
 }
 
-void (*configHandler[])(void) = { configHandleFlash, configHandleResetHighScore, configHandleBrightness };
+static void configHandleAmplitude() {
+  displaySetValue(eepromReadAmplitude());
+  if (muted) {
+    muted = false;
+    soundCtrl(SOUND_START);
+    soundCtrl(SOUND_UNMUTE);
+  }
 
+  if (buttonsConfig2Pressed()) {
+    configChanged = true;
+    uint8_t amplitude = eepromReadAmplitude() + 1;
+    if (amplitude > 15) {
+      amplitude = 0;
+    }
+    eepromSetAmplitude(amplitude);
+    soundCtrl(SOUND_COMMAND + SOUND_SUBCMD_AMPLITUDE + amplitude);
+  }
+}
+
+void (*configHandler[])(void) = { 
+  configHandleResetHighScore, 
+  configHandleResetGameCounter, 
+  configHandleFlash, 
+  configHandleBrightness, 
+  configHandleAmplitude 
+};
 
 void configExec(void *handle) {
   static uint8_t configState = 0;
@@ -60,7 +97,14 @@ void configExec(void *handle) {
 
     miniCanvasClear();
     canvasClear();
-    miniCanvasSetPixel(configState, 0, _red);
+    if (! muted) {
+      muted = true;
+      soundCtrl(SOUND_MUTE);
+    }
+
+    uint8_t row = configState / 3;
+    uint8_t column = configState % 3;
+    miniCanvasSetPixel(column, row, _red);
   }
 
   if (buttonsConfig1Pressed()) {
@@ -73,13 +117,13 @@ void configExec(void *handle) {
   configHandler[configState]();
 
   if (configChanged) {
-    miniCanvasSetPixel(0, 2, _red);
+    miniCanvasSetPixel(0, 3, _red);
     if (buttonsConfig4Pressed()) {
       eepromCommit();
       configChanged = false;
     }
   } else {
-    miniCanvasSetPixel(0, 2, _green);
+    miniCanvasSetPixel(0, 3, _green);
   }
 
   canvasShow();
@@ -87,5 +131,5 @@ void configExec(void *handle) {
 
 
 void configInit() {
-  schAdd(configExec, NULL, 0, 25);
+  schAdd(configExec, NULL, 0, 100);
 }

game-ctrl/eeprom.c

@@ -1,9 +1,15 @@
 #include <stdint.h>
+#include <string.h>
+#include <sys/param.h>
 #include "eeprom.h"
 #include "spi.h"
+#include "scheduler.h"
+#include "display.h"
+#include "canvas.h"
+#include "../rgb-driver/colors.h"
 
 
-#define MAGIC 0xb000
+#define MAGIC 0xb003
 #define HIGHSCORE_ADDR 0x00
 #define DUMMY 0x00
 #define CMD_READ  0b00000011
@@ -15,8 +21,10 @@
 typedef struct {
   uint16_t magic;
   uint16_t highScore;
+  uint16_t gameCounter;
   uint8_t flashColor;
   uint8_t brightness;
+  uint8_t amplitude;
 } t_configBlock;
 
 typedef union {
@@ -57,10 +65,8 @@ void eepromInit() {
   readBuf();
 
   if (buf.v.magic != MAGIC) {
+    memset(buf.buffer, 0, sizeof(t_configBlock));
     buf.v.magic = MAGIC;
-    buf.v.highScore = 0;
-    buf.v.flashColor = 0;
-    buf.v.brightness = 0;
     writeBuf();
   }
 }
@@ -69,6 +75,35 @@ void eepromCommit() {
   writeBuf();
 }
 
+
+void eepromShowValues() {
+  canvasClear();
+  canvasFillRow(0, _green);
+  canvasShow();
+  displaySetValue(buf.v.highScore);
+  wait(2);
+  canvasClear();
+  canvasFillRow(1, _green);
+  canvasShow();
+  displaySetValue(MIN(buf.v.gameCounter, 9999));
+  wait(2);
+  canvasClear();
+  canvasFillRow(2, _green);
+  canvasShow();
+  displaySetValue(buf.v.flashColor);
+  wait(2);
+  canvasClear();
+  canvasFillRow(3, _green);
+  canvasShow();
+  displaySetValue(buf.v.brightness);
+  wait(2);
+  canvasClear();
+  canvasFillRow(4, _green);
+  canvasShow();
+  displaySetValue(buf.v.amplitude);
+  wait(2);
+}
+
 uint16_t eepromReadHighScore() {
   return buf.v.highScore;
 }
@@ -94,3 +129,25 @@ void eepromSetBrightness(uint8_t v) {
   buf.v.brightness = v;
 }
 
+uint8_t eepromReadAmplitude() {
+  return buf.v.amplitude;
+}
+
+void eepromSetAmplitude(uint8_t v) {
+  buf.v.amplitude = v;
+}
+
+uint16_t eepromReadGameCounter() {
+  return buf.v.gameCounter;
+}
+
+void eepromIncGameCounter() {
+  buf.v.gameCounter += 1;
+  writeBuf();
+}
+
+void eepromClearGameCounter() {
+  buf.v.gameCounter = 0;
+}
+
+

game-ctrl/eeprom.h

@@ -5,13 +5,19 @@
 
 
 void eepromInit();
+void eepromCommit();
+void eepromShowValues();
 uint16_t eepromReadHighScore();
 void eepromSetHighScore(uint16_t v);
 uint8_t eepromReadFlashColor();
 void eepromSetFlashColor(uint8_t v);
 uint8_t eepromReadBrightness();
 void eepromSetBrightness(uint8_t v);
-void eepromCommit();
+uint8_t eepromReadAmplitude();
+void eepromSetAmplitude(uint8_t v);
+void eepromIncGameCounter();
+uint16_t eepromReadGameCounter();
+void eepromClearGameCounter();
 
 
 

game-ctrl/game.c

@@ -24,13 +24,15 @@ static uint16_t delayFactor(uint16_t level) {
 }
 
 typedef enum { 
+  e_BootWait,
   e_Start, e_NewStone, e_Down, e_DownDelay, 
   e_ClearRowInit, e_ClearRowNext, e_ClearRowCheck, e_ClearRowFlash, e_ClearRowFlashDelay, e_ClearRowWipe,
   e_GameOver, e_GameOverFill, e_GameOverWipe, e_GameOverDelay 
 } state_t;
 
 void gameExec(void *handle) {
-  static state_t state = e_Start;
+  static state_t state = e_BootWait;
+  static uint16_t bootWaitTime = 2500 / GAME_CYCLE_TIME;
   static uint8_t gameOverDelay;
   static uint8_t rowIndex;
   static uint16_t proceedDelay;
@@ -46,6 +48,12 @@ void gameExec(void *handle) {
 #endif
 // --- engine begin -------------------------------------------------------
   switch (state) {
+    case e_BootWait:
+      bootWaitTime -= 1;
+      if (bootWaitTime == 0) {
+        state = e_Start;
+      }
+      break;
 // --- phase: game --------------------------------------------------------
     case e_Start:
       canvasClear();

game-ctrl/main.c

@@ -14,6 +14,7 @@
 #include "display.h"
 #include "eeprom.h"
 #include "config.h"
+#include "sound.h"
 
 
 int main() {
@@ -34,8 +35,11 @@ int main() {
     displayInit();
     myRandInit();
     canvasInit();
+    soundInit();
     buttonsInit();
 
+    eepromShowValues();
+
     if (isConfigMode()) {
       configInit();
     } else {

game-ctrl/scheduler.c

@@ -109,3 +109,9 @@ uint32_t getSeconds() {
   return s;
 }
 
+void wait(uint8_t t) {
+  uint8_t startTime = getSeconds();
+
+  while (getSeconds() < (startTime + t));
+}
+

game-ctrl/scheduler.h

@@ -32,6 +32,6 @@ void schExec();
 void schUpdate();
 uint8_t schTaskCnt();
 uint32_t getSeconds();
-
+void wait(uint8_t t);
 
 #endif /* PONTCOOPSCHEDULER_H_ */

game-ctrl/shapes.c

@@ -354,14 +354,18 @@ const orientation_t nextOrientation[5][4] = { // 5 = number of directions to mov
 stone_t stone;
 shape_t nextShape;
 
+static shape_t randomNextShape() {
+  return ((shape_t[]){ e_I, e_O, e_T, e_Z, e_S, e_L, e_J })[myRandGet() % e_ShapeInvalid];
+}
+
 void shapesInit() {
   stone.shape = e_ShapeInvalid;
-  nextShape = e_Z;
+  nextShape = randomNextShape();
 }
 
 void stoneCreate() {
   stone.shape = nextShape;
-  nextShape = ((shape_t[]){ e_I, e_O, e_T, e_Z, e_S, e_L, e_J })[myRandGet() % e_ShapeInvalid];
+  nextShape = randomNextShape();
   stone.orientation = e_0;
   stone.x = 4;
   stone.y = 0;
@@ -452,6 +456,21 @@ void nextStoneDraw() {
                      motions[nextShape].color);
 }
 
+static void stoneJustDraw(uint8_t x, uint8_t y, shape_t shape) {
+  canvasSetPixel(x + motions[shape].draw[0].x, 
+                 y + motions[shape].draw[0].y, 
+                 motions[shape].color);
+  canvasSetPixel(x + motions[shape].draw[1].x, 
+                 y + motions[shape].draw[1].y, 
+                 motions[shape].color);
+  canvasSetPixel(x + motions[shape].draw[2].x, 
+                 y + motions[shape].draw[2].y, 
+                 motions[shape].color);
+  canvasSetPixel(x + motions[shape].draw[3].x, 
+                 y + motions[shape].draw[3].y, 
+                 motions[shape].color);
+}
+
 uint8_t stoneDraw() { 
   nextStoneDraw();
 
@@ -466,38 +485,12 @@ uint8_t stoneDraw() {
       canvasIsPixelFree(stone.x + motions[stone.shape].draw[3].x, 
                         stone.y + motions[stone.shape].draw[3].y)) {
     // if so, draw the shape
-    canvasSetPixel(stone.x + motions[stone.shape].draw[0].x, 
+    stoneJustDraw(stone.x, stone.y, stone.shape);
-                   stone.y + motions[stone.shape].draw[0].y, 
-                   motions[stone.shape].color);
-    canvasSetPixel(stone.x + motions[stone.shape].draw[1].x, 
-                   stone.y + motions[stone.shape].draw[1].y, 
-                   motions[stone.shape].color);
-    canvasSetPixel(stone.x + motions[stone.shape].draw[2].x, 
-                   stone.y + motions[stone.shape].draw[2].y, 
-                   motions[stone.shape].color);
-    canvasSetPixel(stone.x + motions[stone.shape].draw[3].x, 
-                   stone.y + motions[stone.shape].draw[3].y, 
-                   motions[stone.shape].color);
     res = 1;
   }
   return res;
 }
 
-static void stoneJustDraw(uint8_t x, uint8_t y, shape_t shape) {
-  canvasSetPixel(x + motions[shape].draw[0].x, 
-                 y + motions[shape].draw[0].y, 
-                 motions[shape].color);
-  canvasSetPixel(x + motions[shape].draw[1].x, 
-                 y + motions[shape].draw[1].y, 
-                 motions[shape].color);
-  canvasSetPixel(x + motions[shape].draw[2].x, 
-                 y + motions[shape].draw[2].y, 
-                 motions[shape].color);
-  canvasSetPixel(x + motions[shape].draw[3].x, 
-                 y + motions[shape].draw[3].y, 
-                 motions[shape].color);
-}
-
 void stoneDrawConfigPattern() {
   stoneJustDraw(1, 0, e_I);
   stoneJustDraw(3, 4, e_O);

game-ctrl/sound.c

@@ -1,10 +1,12 @@
 #include <stdint.h>
 #include "sound.h"
 #include "spi.h"
+#include "eeprom.h"
 
 
 
 void soundInit() {
+  soundCtrl(SOUND_COMMAND + SOUND_SUBCMD_AMPLITUDE + eepromReadAmplitude());
 }
 
 

readme.md

@@ -39,6 +39,8 @@ The communcation with the game play controller is implemented as a sequences of
 
 ![](./docs/rgb-driver.jpg)
 
+Details are here https://gitea.hottis.de/wn/tetris/src/branch/main/rgb-driver/readme.md
+
 
 ## Score Display
 

rgb-driver/readme.md

@@ -26,6 +26,37 @@ Schematics and legend for signals:
 
 ![](./docs/schematics.jpeg)
 
+### Some more explanations
+
+Consider above schematics and the screen shot "Last octets" from the oscilloscope.
+
+![](./docs/timing.png)
+
+Timer TA1 is running in "up mode" to the value 45 set in compare register `TA1CCR0`. The compare registers `TA1CCR1` is set to 10, `TA1CCR2` is set to 22.
+The output mode of the timer is set to "Reset/Set", which means the GPIO associated with `TA1CCR1` (P2.1) and `TA1CCR2` (P2.4) are set at the overflow and 
+restart of the counter and reset when the counter matches the associated compare value.
+
+So, on P2.1 (D1 on the oscilloscope) we have a long pulse and at P2.4 (D0 on the oscilloscope) we have a short pulse, with synchronous raising edge.
+
+![](./docs/74hc74-function-table.png)
+
+The inverted signal P2.4 is connected to the Clock input of a 74HC74 D-flipflop, the data input of the flipflop is connected to GPIO P1.0 (D2 on the oscilloscope).
+
+The interrupt service routine `shifter_isr` is triggered by the overflow and restart of the timer, this interrupt service routine provides the next bit to be 
+signaled on P1.0. This bit is stored at the falling edge of P2.4 (long pulse) in the flipflop.
+
+The short pulse (P2.1, D1) is ANDed using a 74HC08 with the inverted output of the flipflop, the long pulse (P2.4, D0) is ANDed with the non-inverted output of
+the flipflop, the ANDed results are ORed using a 74HC32.
+
+So, at the output of the OR gate (yellow on the oscilloscope) we get a long pulse for a 1 at P1.0 provided by the ISR and a short pulse for a 0 at P1.0.
+
+The routine `drawscreen` takes color values from the "frame buffer" beginning at `screendata` and translated them into the red, green and blue values and provides these values, first red, then green and finally blue to the ISR via the `DATA_REGISTER`.
+
+The ISR cycles over the `DATA_REGISTER` and presents the bits at P1.0.
+
+Additionally, when the first bit of a full draw screen cycle is presented at P1.0 by the ISR, it also sets the data enable signal at P1.1 and when the last bit has been provided it disabled the data enable signal. This signal is also synchronized using a flipflop and used to enable the short/long pulses using an AND gate.
+
+
 
 ## Timing
 

sound-driver/Makefile

@@ -12,7 +12,7 @@ ASFLAGS=$(COMMONFLAGS) -D__ASSEMBLER__
 
 LDFLAGS=-mmcu=$(MCU) -L $(TOOLCHAIN_PREFIX)/include
 
-$(ARTIFACT).elf:	main.o scheduler.o spi.o spi_init.o sequencer.o melody_tetris.o melody_tusch1.o psg.o mute.o melody_pling.o
+$(ARTIFACT).elf:	main.o scheduler.o spi.o spi_init.o sequencer.o melody_tetris.o melody_tusch1.o psg.o mute.o melody_pling.o config.o
 	$(CC) -o $@ $(LDFLAGS) $^
 	$(OBJDUMP) -D $(ARTIFACT).elf > $(ARTIFACT).txt
 

sound-driver/config.c

@@ -0,0 +1,26 @@
+#include <stdint.h>
+#include <sys/param.h>
+#include "config.h"
+
+
+typedef struct {
+  uint8_t melodyAmplitude;
+  uint8_t effectsAmplitude;
+} config_t;
+
+config_t config;
+
+
+void configSetAmplitude(uint8_t v) {
+  config.melodyAmplitude = MIN(v, 15);
+  config.effectsAmplitude = MIN(v+4, 15);
+}
+
+uint8_t *configGetMelodyAmplitudePtr() {
+  return &(config.melodyAmplitude);
+}
+
+uint8_t *configGetEffectsAmplitudePtr() {
+  return &(config.effectsAmplitude);
+}
+

sound-driver/config.h

@@ -0,0 +1,12 @@
+#ifndef _CONFIG_H_
+#define _CONFIG_H_
+
+
+#include <stdint.h>
+
+void configSetAmplitude(uint8_t v);
+uint8_t *configGetMelodyAmplitudePtr();
+uint8_t *configGetEffectsAmplitudePtr();
+
+
+#endif // _CONFIG_H_

sound-driver/melody_pling.c

@@ -3,6 +3,8 @@
 #include "psg.h"
 #include "sequencer.h"
 #include "scheduler.h"
+#include "config.h"
+
 
 const t_tone plingVoice1[] = {
   { .octave = e_O_5,    .note = e_C,     .length = e_L_1_16,    .legato = false, .staccato = false },
@@ -18,13 +20,14 @@ const t_tone plingVoice1[] = {
 };
 
 t_melodies pling = {
-  .melodies = { { .amplitude = 12, .tones = plingVoice1 } },
+  .melodies = { { .tones = plingVoice1 } },
   .numOfMelodies = 1,
   .pace = 200,
   .chip = 1
 };
 
 void playPling() {
+  pling.p_amplitude = configGetEffectsAmplitudePtr();
   sequencerPlayMelodies(&pling);
 }
 

sound-driver/melody_tetris.c

@@ -3,6 +3,7 @@
 #include "psg.h"
 #include "sequencer.h"
 #include "scheduler.h"
+#include "config.h"
 
 
 /*
@@ -924,7 +925,7 @@ const t_tone voice3[] = {
 
 #define INITIAL_PACE 160
 t_melodies tetrisTheme = {
-  .melodies = { { .amplitude = 8, .tones = voice1 }, { .amplitude = 8, .tones = voice2 }, { .amplitude = 8, .tones = voice3 } },
+  .melodies = { { .tones = voice1 }, { .tones = voice2 }, { .tones = voice3 } },
   .numOfMelodies = 3,
   .pace = INITIAL_PACE,
   .chip = 0
@@ -932,6 +933,7 @@ t_melodies tetrisTheme = {
 
 void playMelodyTetris() {
   tetrisTheme.pace = INITIAL_PACE; // reset to start value each time
+  tetrisTheme.p_amplitude = configGetMelodyAmplitudePtr();
   sequencerPlayMelodies(&tetrisTheme);
 }
 

sound-driver/melody_tetris.h

@@ -5,5 +5,6 @@
 void playMelodyTetris();
 void stopMelodyTetris();
 void playMelodyTetrisFaster();
+void playMelodyTetrisAmplitude(uint8_t a);
 
 #endif // _MELODY_TETRIS_H_

sound-driver/melody_tusch1.c

@@ -3,7 +3,7 @@
 #include "psg.h"
 #include "sequencer.h"
 #include "scheduler.h"
-#include "melody_tetris.h"
+#include "config.h"
 
 const t_tone tusch1voice1[] = {
   { .octave = e_O_5,    .note = e_C,     .length = e_L_1_4,     .legato = false, .staccato = true  },
@@ -72,15 +72,15 @@ const t_tone tusch1voice3[] = {
 };
 
 t_melodies tusch1 = {
-  .melodies = { { .amplitude = 12, .tones = tusch1voice1 }, { .amplitude = 12, .tones = tusch1voice2 }, { .amplitude = 12, .tones = tusch1voice3 } },
+  .melodies = { { .tones = tusch1voice1 }, { .tones = tusch1voice2 }, { .tones = tusch1voice3 } },
   .numOfMelodies = 3,
   .pace = 200,
   .chip = 1
 };
 
 void playTusch1() {
+  tusch1.p_amplitude = configGetEffectsAmplitudePtr();
   sequencerPlayMelodies(&tusch1);
-//  playMelodyTetrisFaster();
 }
 
 

sound-driver/sequencer.c

@@ -59,7 +59,7 @@ void sequencerExec(void *handle) {
           if (melody->tones[melody->idx].length == e_L_EndMark) {
             melody->idx = 0;
           }
-          psgPlayTone(melodies->chip, channel, melody->amplitude, melody->tones[melody->idx].octave, melody->tones[melody->idx].note);
+          psgPlayTone(melodies->chip, channel, *(melodies->p_amplitude), melody->tones[melody->idx].octave, melody->tones[melody->idx].note);
           melody->lengthCnt = (melody->tones[melody->idx].staccato) ? 
             (calcLength(melodies, melody->tones[melody->idx].length) / 2) : 
             calcLength(melodies, melody->tones[melody->idx].length);

sound-driver/sequencer.h

@@ -44,7 +44,6 @@ typedef struct {
   uint16_t idx;
   uint16_t lengthCnt;
   t_sequencerState state;
-  uint8_t amplitude;
   const t_tone *tones;
 } t_melody;
 
@@ -53,6 +52,7 @@ typedef struct {
 typedef struct {
   uint8_t slotMask;
   uint8_t chip;
+  uint8_t *p_amplitude;
   uint8_t taskId;
   uint16_t quarterLength;
   uint8_t numOfMelodies;

sound-driver/soundCodes.h

@@ -8,7 +8,9 @@
 #define SOUND_GAMEOVER 0x08
 #define SOUND_FANFARE 0x10
 #define SOUND_LOCK 0x20
-#define SOUND_MOTION 0x40
+#define SOUND_PLING 0x40
-#define SOUND_PLING 0x80
+#define SOUND_COMMAND 0x80
+
+#define SOUND_SUBCMD_AMPLITUDE 0x40
 
 #endif // _SOUND_CODES_H_

sound-driver/spi.S

@@ -6,12 +6,21 @@
 receive_isr:
   bit     #UCB0RXIFG, &UC0IFG
   jz      receive_isr_no_data
+  bit     #SOUND_COMMAND, &cmd
+  jnz     receive_isr_no_data
   bis     UCB0RXBUF, &cmd
 receive_isr_no_data:
   reti
 
   .global spiCmdHandler
 spiCmdHandler:
+spiCmdHandler_0:
+  bit     #SOUND_COMMAND, &cmd
+  jz      spiCmdHandler_1
+  ;; insert a call here
+  call    #spiCommandDispatcher
+  mov.b   #0, &cmd
+  ret
 spiCmdHandler_1:
   bit     #SOUND_MUTE, &cmd
   jz      spiCmdHandler_2
@@ -44,11 +53,6 @@ spiCmdHandler_6:
   ;; insert a call here
   bic     #SOUND_LOCK, &cmd
 spiCmdHandler_7:
-  bit     #SOUND_MOTION, &cmd
-  jz      spiCmdHandler_8
-  ;; insert a call here
-  bic     #SOUND_MOTION, &cmd
-spiCmdHandler_8:
   bit     #SOUND_PLING, &cmd
   jz      spiCmdHandler_end
   call    #playPling

sound-driver/spi_init.c

@@ -4,9 +4,10 @@
 #include "scheduler.h"
 #include "spi.h"
 #include "soundCodes.h"
+#include "config.h"
 
 
-uint8_t cmd;
+volatile uint8_t cmd;
 
 void spiInit() {
   // SPI slave
@@ -25,7 +26,14 @@ void spiInit() {
   UC0IE |= UCB0RXIE;
 
   cmd = SOUND_IDLE;
-  schAdd(spiCmdHandler, NULL, 0, 100);
+  schAdd(spiCmdHandler, NULL, 0, 5);
 }
 
+void spiCommandDispatcher() {
+  cmd &= ~SOUND_COMMAND;
 
+  if (cmd & SOUND_SUBCMD_AMPLITUDE) {
+    cmd &= ~SOUND_SUBCMD_AMPLITUDE;
+    configSetAmplitude(cmd);
+  }
+}