Cirrus-logic AN181 Uživatelský manuál stáhnout pdf (Strana 4)

AN181

4 AN181REV1

SAMPLE POLLING ROUTINE

Pseudo Code

#define EventMask = 0xFFC0

#define RegisterMask = 0x003F

#define RxEvent = 0x0004

#define TxEvent = 0x0008

#define BufEvent = 0x000C

Poll-Chip{

unsigned short Event;

Event = Poll-Registers()

While Event <> 0x0000 {

Switch (RegisterMask & Event) {

Case RxEvent:

result = Process-RxEvent(Event);

break;

Case TxEvent:

result = Process-TxEvent(Event)

break;

Case BufEvent:

result = Process-BufEvent(Event);

break;

} // End Switch

Event = Poll-Registers()

} // End While

} // End Poll-Chip

Poll-Registers{

unsigned short Event;

Event = Read-RxEventRegister();

If (EventMask & Event) {

return Event;}

Event = Read-TxEventRegister()

If (EventMask & Event) {

return Event;}

Event = Read-BufEventRegister()

If (EventMask & Event) {

return Event;}

Return 0x0000

// End Poll-Registers

}

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