//*****************************************************************************
//
// Handles the SysTick timeout interrupt.
//
//*****************************************************************************
void
SysTickIntHandler(void)
{
unsigned long ulData, ulDelta;
//
// Read the state of the buttons.
//
ulData = GPIOPinRead(GPIO_PORTG_BASE,
(GPIO_PIN_3 | GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_6 |
GPIO_PIN_7));
//
// Determine the switches that are at a different state than the debounced
// state.
//
ulDelta = ulData ^ g_ucSwitches;
//
// Increment the clocks by one.
//
g_ucSwitchClockA ^= g_ucSwitchClockB;
g_ucSwitchClockB = ~g_ucSwitchClockB;
//
// Reset the clocks corresponding to switches that have not changed state.
//
g_ucSwitchClockA &= ulDelta;
g_ucSwitchClockB &= ulDelta;
//
// Get the new debounced switch state.
//
g_ucSwitches &= g_ucSwitchClockA | g_ucSwitchClockB;
g_ucSwitches |= (~(g_ucSwitchClockA | g_ucSwitchClockB)) & ulData;
//
// Determine the switches that just changed debounced state.
//
ulDelta ^= (g_ucSwitchClockA | g_ucSwitchClockB);
//
// See if the up button was just pressed.
//
if((ulDelta & 0x08) && !(g_ucSwitches & 0x08))
{
//
// Increase the volume of the playback.
//
ClassDVolumeUp(16);
}
//
// See if the down button was just pressed.
//
if((ulDelta & 0x10) && !(g_ucSwitches & 0x10))
{
//
// Decrease the volume of the playback.
//
ClassDVolumeDown(16);
}
//
// See if the left button was just pressed.
//
if((ulDelta & 0x20) && !(g_ucSwitches & 0x20))
{
//
// Start playback of the PCM stream.
//
ClassDPlayPCM(g_pucPCMData, sizeof(g_pucPCMData));
}
//
// See if the right button was just pressed.
//
if((ulDelta & 0x40) && !(g_ucSwitches & 0x40))
{
//
// Start playback of the ADPCM stream.
//
ClassDPlayADPCM(g_pucADPCMData, sizeof(g_pucADPCMData));
}
//
// See if the select button was just pressed.
//
if((ulDelta & 0x80) && !(g_ucSwitches & 0x80))
{
//
// Stop playback.
//
ClassDStop();
}
}
//*****************************************************************************
//
// Performs all necessary menu and control processing based on new button
// states.
//
// \param ucButtons contains the current state of each of the front panel
// buttons. A 1 in a bit position indicates that the corresponding button
// is released while a 0 indicates that the button is pressed.
// \param ucChanged contains bit flags showing which button states changed
// since the last call to this function. A 1 indicates that the corresponding
// button state changed while a 0 indicates that it remains unchanged.
// \param ucRepeat contains bit flags indicating whether a key autorepeat
// event is being signalled for each key. A 1 indicates that an autorepeat is
// being signalled while a 0 indicates that it is not.
//
// This is the top level function called when any key changes state. This
// updates the relevant control or controls on the screen and processes
// the key appropriately for the control that currently has focus.
//
// \return Returns \b true if the menu was dismissed as a result of this
// call (in which case the caller should refresh the main waveform
// display area) or any control reported that a display update is required.
// Returns \b false if the menu is still being displayed or if it
// was not being displayed when the function was called and no control
// reported needing a display update.
//
//*****************************************************************************
tBoolean
MenuProcess(unsigned char ucButtons, unsigned char ucChanged,
unsigned char ucRepeat)
{
tGroup *pFocusGroup;
tBoolean bRetcode;
tBoolean bRedrawNeeded;
//
// Assume we won't be dismissing the menu until we find out otherwise.
//
bRedrawNeeded = false;
//
// Which group has focus?
//
pFocusGroup = g_sMenu.ppcGroups[g_sMenu.ucFocusGroup];
//
// Is the menu currently visible?
//
if(!g_bMenuShown)
{
//
// The menu is not currently shown. First check to see if we need to
// show it and, if so, do this. We look for a release of the select
// button to trigger the display of the menu. Note that we
// deliberately ignore all other key notifications that may be present
// at the same time.
//
if(BUTTON_RELEASED(SELECT_BUTTON, ucButtons, ucChanged))
{
//
// Draw the menu.
//
g_bMenuShown = MenuDisplay(&g_sMenu);
//
// Get rid of any alert message that may currently be displayed.
//
RendererClearAlert();
}
else
{
//
// We were not being asked to show the menu so we pass the
// various events on to the group for it to decide what to do
// with them. For the group, we pass on any button press or auto-
// repeat indication. We ignore button releases in this case.
//
//
// Left button press or repeat.
//
if(BUTTON_PRESSED(LEFT_BUTTON, ucButtons, ucChanged) ||
BUTTON_REPEAT(LEFT_BUTTON, ucRepeat))
{
bRetcode = pFocusGroup->pfnGroupEventProc(pFocusGroup,
MENU_EVENT_LEFT);
if(bRetcode)
{
bRedrawNeeded = true;
}
}
//
// Right button press or repeat.
//
if(BUTTON_PRESSED(RIGHT_BUTTON, ucButtons, ucChanged) ||
BUTTON_REPEAT(RIGHT_BUTTON, ucRepeat))
{
bRetcode = pFocusGroup->pfnGroupEventProc(pFocusGroup,
MENU_EVENT_RIGHT);
if(bRetcode)
{
bRedrawNeeded = true;
}
}
//
// Left button released.
//
if(BUTTON_RELEASED(LEFT_BUTTON, ucButtons, ucChanged))
{
bRetcode = pFocusGroup->pfnGroupEventProc(pFocusGroup,
MENU_EVENT_LEFT_RELEASE);
if(bRetcode)
{
bRedrawNeeded = true;
}
}
//
// Right button released.
//
if(BUTTON_RELEASED(RIGHT_BUTTON, ucButtons, ucChanged))
{
bRetcode = pFocusGroup->pfnGroupEventProc(pFocusGroup,
MENU_EVENT_RIGHT_RELEASE);
if(bRetcode)
{
bRedrawNeeded = true;
}
}
//
// Up button press.
//
if(BUTTON_PRESSED(UP_BUTTON, ucButtons, ucChanged) ||
BUTTON_REPEAT(UP_BUTTON, ucRepeat))
{
bRetcode = pFocusGroup->pfnGroupEventProc(pFocusGroup,
MENU_EVENT_UP);
if(bRetcode)
{
bRedrawNeeded = true;
}
}
//
// Down button press.
//
if(BUTTON_PRESSED(DOWN_BUTTON, ucButtons, ucChanged) ||
BUTTON_REPEAT(DOWN_BUTTON, ucRepeat))
{
bRetcode = pFocusGroup->pfnGroupEventProc(pFocusGroup,
MENU_EVENT_DOWN);
if(bRetcode)
{
bRedrawNeeded = true;
}
}
}
}
else
{
//
// The menu is already visible so we ignore left and right keys and
// use up/down/select only to change the focus group.
//
//
// If this button press will result in a group focus change we need to
// redraw the current group in its non-focused colors, update the
// focus to the new group then send an activate event to the group.
//
if(BUTTON_PRESSED(DOWN_BUTTON, ucButtons, ucChanged) ||
BUTTON_REPEAT(DOWN_BUTTON, ucRepeat) ||
BUTTON_PRESSED(UP_BUTTON, ucButtons, ucChanged) ||
BUTTON_REPEAT(UP_BUTTON, ucRepeat))
{
//
// Redraw the current focus button in its original colors
//
MenuDrawGroupButton(&g_sMenu, g_sMenu.ucFocusGroup,
&g_psBtnColors);
//
// Update the group with the focus
//
if(BUTTON_PRESSED(DOWN_BUTTON, ucButtons, ucChanged) ||
BUTTON_REPEAT(DOWN_BUTTON, ucRepeat))
{
if(g_sMenu.ucFocusGroup < (g_sMenu.ucNumGroups - 1))
{
g_sMenu.ucFocusGroup++;
}
}
else
{
if(g_sMenu.ucFocusGroup > 0)
{
g_sMenu.ucFocusGroup--;
}
}
//
// Redraw the new focus button with the focus colors.
//
MenuDrawGroupButton(&g_sMenu, g_sMenu.ucFocusGroup,
&g_psFocusColors);
//
// Tell the new group that it has been activated.
//
pFocusGroup = g_sMenu.ppcGroups[g_sMenu.ucFocusGroup];
bRetcode = (pFocusGroup->pfnGroupEventProc)(pFocusGroup,
MENU_EVENT_ACTIVATE);
if(bRetcode)
{
bRedrawNeeded = true;
}
}
//
// Now look for a release of the SELECT key. This indicates that we
// must dismiss the menu.
//
if(BUTTON_RELEASED(SELECT_BUTTON, ucButtons, ucChanged))
{
//
// We did receive a release message for the SELECT button so
// tell the caller that the menu has been dismissed.
//
g_bMenuShown = false;
bRedrawNeeded = true;
}
}
//
// Play the button click sound if any button was just pressed.
//
if((~ucButtons & ucChanged) && g_bClicksEnabled)
{
ClassDPlayADPCM(g_pucADPCMClick, sizeof(g_pucADPCMClick));
}
return(bRedrawNeeded);
}
