Intel 386 Manuale Utente Scaricare il pdf (Pagina 323)

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101

Intel386™ EX EMBEDDED MICROPROCESSOR USER’S MANUAL

11-36

#define SIO_0 0

#define LENGTH 32

char String_Read[LENGTH];

int error;

error = SerialReadStr (SIO_0,

String_Read,

LENGTH);

Real/Protected Mode

No changes required.

*****************************************************************************/

int SerialReadStr(int Unit, char far *str, int count)

{

WORD ReceivePortAddr;

WORD StatusPortAddr;

BYTE Status;

int i;

/* Set Port base, based on serial port used */

ReceivePortAddr = (Unit ? RBR1 : RBR0);

StatusPortAddr = (Unit ? LSR1 : LSR0);

for(i=0; i < count-1; i++)

{

// Status register is cleared after read, so we must save

// it’s value when read

while(!((Status=_GetEXRegByte(StatusPortAddr)) & SIO_RX_BUF_FULL))

if( Status & SIO_ERROR_BITS ) /* Error Bit set then return NULL */

{

str[i+1] = ‘\0’;

return Status & SIO_ERROR_BITS;

}

str[i] = _GetEXRegByte(ReceivePortAddr);

}

str[i] = ‘\0’;

return E_OK;

}/* SerialReadStr */

/*****************************************************************************

SerialReadChar:

Description:

Is a Polled serial port read function that waits forever or

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Intel 386 Manuale Utente Pagina 323

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