Cypress Semiconductor AN6077 Manual do Utilizador descarregar pdf (Página 80)

// Renumerate if necessary. Do this by checking the renum

bit. If it

// is already set, there is no need to renumerate. The renum

bit will

// already be set if this firmware was loaded from an

eeprom.

if(!(USBCS & bmRENUM))

{

EZUSB_Discon(TRUE); // renumerate

}

#endif

// unconditionally re-connect. If we loaded from eeprom we

are

// disconnected and need to connect. If we just renumerated

this

// is not necessary but doesn't hurt anything

USBCS &=~bmDISCON;

CKCON = (CKCON&(~bmSTRETCH)) |

FW_STRETCH_VALUE; // Set stretch

// clear the Sleep flag.

Sleep = FALSE;

// Task Dispatcher

while(TRUE) // Main Loop

{

// Poll User Device

TD_Poll();

// Check for pending SETUP

if(GotSUD)

{

SetupCommand(); // Implement setup command

GotSUD = FALSE; // Clear SETUP flag

}

// check for and handle suspend.

// NOTE: Idle mode stops the processor clock. There are

only two

// ways out of idle mode, the WAKEUP pin, and detection

of the USB

// resume state on the USB bus. The timers will stop and

the

// processor will not wake up on any other interrupts.

if (Sleep)

{

if(TD_Suspend())

{

Sleep = FALSE; // Clear the "go to sleep" flag. Do

it here to prevent any race condition between wakeup and the

next sleep.

{

EZUSB_Susp(); // Place processor in idle

mode.

}

while(!Rwuen && EZUSB_EXTWAKEUP());

// above. Must continue to go back into suspend if the

host has disabled remote wakeup

// *and* the wakeup was caused by the external

wakeup pin.

// 8051 activity will resume here due to USB bus or

Wakeup# pin activity.

EZUSB_Resume(); // If source is the Wakeup# pin,

signal the host to Resume.

TD_Resume();

}

BOOL HighSpeedCapable()

{

// this function determines if the chip is high-speed capable.

// FX2 and FX2LP are high-speed capable. FX1 is not - it

does

// not have a high-speed transceiver.

if (GPCR2 & bmFULLSPEEDONLY)

return FALSE;

else

return TRUE;

}

// Device request parser

void SetupCommand(void)

{

void *dscr_ptr;

switch(SETUPDAT[1])

{

case SC_GET_DESCRIPTOR: // *** Get

Descriptor

if(DR_GetDescriptor())

switch(SETUPDAT[3])

{

case GD_DEVICE: // Device

SUDPTRH = MSB(pDeviceDscr);

SUDPTRL = LSB(pDeviceDscr);

break;

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