/*********************************************************************
* Function: void SYSTEM_Initialize( SYSTEM_STATE state )
*
* Overview: Initializes the system.
*
* PreCondition: None
*
* Input: SYSTEM_STATE - the state to initialize the system into
*
* Output: None
*
********************************************************************/
void SYSTEM_Initialize( SYSTEM_STATE state )
{
switch(state)
{
case SYSTEM_STATE_USB_START:
//On the PIC18F46J50 Family of USB microcontrollers, the PLL will not power up and be enabled
//by default, even if a PLL enabled oscillator configuration is selected (such as HS+PLL).
//This allows the device to power up at a lower initial operating frequency, which can be
//advantageous when powered from a source which is not gauranteed to be adequate for 48MHz
//operation. On these devices, user firmware needs to manually set the OSCTUNE<PLLEN> bit to
//power up the PLL.
{
unsigned int pll_startup_counter = 600;
OSCTUNEbits.PLLEN = 1; //Enable the PLL and wait 2+ms until the PLL locks before enabling USB module
while(pll_startup_counter--);
}
//Device switches over automatically to PLL output after PLL is locked and ready.
BUTTON_Enable(BUTTON_USB_DEVICE_HID_CUSTOM);
softStartStatus = SOFT_START_POWER_START;
break;
case SYSTEM_STATE_USB_SUSPEND:
//Configure device for low power consumption. Turn off app power.
AppPowerDisable();
softStartStatus = SOFT_START_POWER_OFF;
break;
case SYSTEM_STATE_USB_RESUME:
softStartStatus = SOFT_START_POWER_START;
break;
}
}
/******************************************************************************
* Function: void USBCBSuspend(void)
*
* Overview: Call back that is invoked when a USB suspend is detected
*****************************************************************************/
void USBCBSuspend(void)
{
#if defined(SOFTSTART_ENABLED)
//Turn off the App Vdd
AppPowerDisable();
#endif
//Example power saving code. Insert appropriate code here for the desired
//application behavior. If the microcontroller will be put to sleep, a
//process similar to that shown below may be used:
//ConfigureIOPinsForLowPower();
//SaveStateOfAllInterruptEnableBits();
//DisableAllInterruptEnableBits();
//should enable at least USBActivityIF as a wake source:
//EnableOnlyTheInterruptsWhichWillBeUsedToWakeTheMicro();
Sleep();
//Preferrably, these should be done in the USBCBWakeFromSuspend() function:
//RestoreStateOfAllPreviouslySavedInterruptEnableBits();
//RestoreIOPinsToNormal();
//IMPORTANT NOTE: Do not clear the USBActivityIF (ACTVIF) bit here.
//This bit is cleared inside the usb_device.c file. Clearing USBActivityIF
//here will cause things to not work as intended.
}
