//*****************************************************************************
//
// This application performs simple audio synthesis and playback based on the
// keys pressed on the touch screen virtual piano keyboard.
//
//*****************************************************************************
int
main(void)
{
uint32_t ui32SysClock, ui32OldKey, ui32NewKey;
tContext sContext;
//
// Run from the PLL at 120 MHz.
//
ui32SysClock = SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
SYSCTL_OSC_MAIN |
SYSCTL_USE_PLL |
SYSCTL_CFG_VCO_480), 120000000);
//
// Configure the device pins.
//
PinoutSet();
//
// Initialize the display driver.
//
Kentec320x240x16_SSD2119Init(ui32SysClock);
//
// Initialize the graphics context.
//
GrContextInit(&sContext, &g_sKentec320x240x16_SSD2119);
//
// Draw the application frame.
//
FrameDraw(&sContext, "synth");
//
// Draw the keys on the virtual piano keyboard.
//
DrawWhiteKeys(&sContext);
DrawBlackKeys(&sContext);
//
// Initialize the touch screen driver.
//
TouchScreenInit(ui32SysClock);
TouchScreenCallbackSet(TouchCallback);
//
// Initialize the sound driver.
//
SoundInit(ui32SysClock);
SoundVolumeSet(128);
SoundStart(g_pi16AudioBuffer, AUDIO_SIZE, 64000, SoundCallback);
//
// Default the old and new key to not pressed so that the first key press
// will be properly drawn on the keyboard.
//
ui32OldKey = NUM_WHITE_KEYS + NUM_BLACK_KEYS;
ui32NewKey = NUM_WHITE_KEYS + NUM_BLACK_KEYS;
//
// Loop forever.
//
while(1)
{
//
// See if the first half of the sound buffer needs to be filled.
//
if(HWREGBITW(&g_ui32Flags, FLAG_PING) == 1)
{
//
// Synthesize new audio into the first half of the sound buffer.
//
ui32NewKey = GenerateAudio(g_pi16AudioBuffer, AUDIO_SIZE / 2);
//
// Clear the flag for the first half of the sound buffer.
//
HWREGBITW(&g_ui32Flags, FLAG_PING) = 0;
}
//
// See if the second half of the sound buffer needs to be filled.
//
if(HWREGBITW(&g_ui32Flags, FLAG_PONG) == 1)
{
//
// Synthesize new audio into the second half of the sound buffer.
//
ui32NewKey = GenerateAudio(g_pi16AudioBuffer + (AUDIO_SIZE / 2),
AUDIO_SIZE / 2);
//
// Clear the flag for the second half of the sound buffer.
//
HWREGBITW(&g_ui32Flags, FLAG_PONG) = 0;
}
//
// See if a different key has been pressed.
//
if(ui32OldKey != ui32NewKey)
{
//
// See if the old key was a white key.
//
if(ui32OldKey < NUM_WHITE_KEYS)
{
//
// Redraw the face of the white key so that it no longer shows
// as being pressed.
//
FillWhiteKey(&sContext, ui32OldKey, ClrWhiteKey);
}
//
// See if the old key was a black key.
//
else if(ui32OldKey < (NUM_WHITE_KEYS + NUM_BLACK_KEYS))
{
//
// Redraw the face of the black key so that it no longer shows
// as being pressed.
//
FillBlackKey(&sContext, ui32OldKey - NUM_WHITE_KEYS,
ClrBlackKey);
}
//
// See if the new key is a white key.
//
if(ui32NewKey < NUM_WHITE_KEYS)
{
//
// Redraw the face of the white key so that it is shown as
// being pressed.
//
FillWhiteKey(&sContext, ui32NewKey, ClrPressed);
}
//
// See if the new key is a black key.
//
else if(ui32NewKey < (NUM_WHITE_KEYS + NUM_BLACK_KEYS))
{
//
// Redraw the face of the black key so that it is shown as
// being pressed.
//
FillBlackKey(&sContext, ui32NewKey - NUM_WHITE_KEYS,
ClrPressed);
}
//
// Save the new key as the old key.
//
ui32OldKey = ui32NewKey;
}
}
}
//*****************************************************************************
//
// A simple demonstration of the features of the TivaWare Graphics Library.
//
//*****************************************************************************
int
main(void)
{
tContext sContext;
uint32_t ui32SysClock;
//
// Run from the PLL at 120 MHz.
//
ui32SysClock = SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
SYSCTL_OSC_MAIN |
SYSCTL_USE_PLL |
SYSCTL_CFG_VCO_480), 120000000);
//
// Configure the device pins.
//
PinoutSet();
//
// Initialize the display driver.
//
Kentec320x240x16_SSD2119Init(ui32SysClock);
//
// Initialize the graphics context.
//
GrContextInit(&sContext, &g_sKentec320x240x16_SSD2119);
//
// Draw the application frame.
//
FrameDraw(&sContext, "grlib-demo");
//
// Configure and enable uDMA
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UDMA);
SysCtlDelay(10);
ROM_uDMAControlBaseSet(&psDMAControlTable[0]);
ROM_uDMAEnable();
//
// Initialize the sound driver.
//
SoundInit(ui32SysClock);
SoundVolumeSet(128);
SoundStart(g_pi16AudioBuffer, AUDIO_SIZE, 64000, SoundCallback);
//
// Initialize the touch screen driver and have it route its messages to the
// widget tree.
//
TouchScreenInit(ui32SysClock);
TouchScreenCallbackSet(WidgetPointerMessage);
//
// Add the title block and the previous and next buttons to the widget
// tree.
//
WidgetAdd(WIDGET_ROOT, (tWidget *)&g_sPrevious);
WidgetAdd(WIDGET_ROOT, (tWidget *)&g_sTitle);
WidgetAdd(WIDGET_ROOT, (tWidget *)&g_sNext);
//
// Add the first panel to the widget tree.
//
g_ui32Panel = 0;
WidgetAdd(WIDGET_ROOT, (tWidget *)g_psPanels);
CanvasTextSet(&g_sTitle, g_pcPanelNames[0]);
//
// Issue the initial paint request to the widgets.
//
WidgetPaint(WIDGET_ROOT);
//
// Loop forever handling widget messages.
//
while(1)
{
//
// Process any messages in the widget message queue.
//
WidgetMessageQueueProcess();
//
// See if the first half of the sound buffer needs to be filled.
//
if(HWREGBITW(&g_ui32Flags, FLAG_PING) == 1)
{
//
// generate new audio into the first half of the sound buffer.
//
GenerateAudio(g_pi16AudioBuffer, AUDIO_SIZE / 2);
//
// Clear the flag for the first half of the sound buffer.
//
HWREGBITW(&g_ui32Flags, FLAG_PING) = 0;
}
//
// See if the second half of the sound buffer needs to be filled.
//
if(HWREGBITW(&g_ui32Flags, FLAG_PONG) == 1)
{
//
// generate new audio into the second half of the sound buffer.
//
GenerateAudio(g_pi16AudioBuffer + (AUDIO_SIZE / 2),
AUDIO_SIZE / 2);
//
// Clear the flag for the second half of the sound buffer.
//
HWREGBITW(&g_ui32Flags, FLAG_PONG) = 0;
}
}
}
