Intel 386 Manual do Utilizador descarregar pdf (Página 321)

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Intel386™ EX EMBEDDED MICROPROCESSOR USER’S MANUAL

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options

ModemCntrl Defines the operation of the modem control lines

BaudRate Specifies baud rate. The baud divisor value is calculated

based on clocking source and clock frequency. The

clocking frequency is set by calling the

InitializeLibrary function.

ClockRate Specifies the serial port clocking rate, for internal

clocking = CLK2, for external = COMCLK

Returns:Error Codes

E_INVAILD_DEVICE -- Unit number specifies a non-existing device

E_OK -- Initialized OK, No error.

Assumptions:

SIOCFG Has already been configured for Clocking source and Modem

control source

REMAPCFG register has Expanded I/O space access enabled (ESE bit set).

The processor Port pin are initialized separately.

Syntax:

#define SIO_0 0x0

#define SIO_8N1 (SIO_8DATA | SIO_1STOPBIT | SIO_NOPARITY)

#define SIO_MCR_RTS 0x2

#define SIO_MCR_DTR 0x1

#define SIO_8DATA 0x3

#define SIO_1STOPBIT 0x0

//Clock rate of COMCLK, i.e., External clocking

#define BAUD_CLKIN 1843200L

int error;

error = InitSIO(SIO_0, // Which Serial Port

SIO_8N1, // Mode, 8-data, no parity, 1-stop

SIO_MCR_RTS+SIO_MCR_DTR, // Modem line controls

9600, // Baud Rate

BAUD_CLKIN); // Baud Clocking Rate

Real/Protected Mode:

No changes required.

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

int InitSIO(int Unit, BYTE Mode, BYTE ModemCntrl, DWORD BaudRate,

DWORD BaudClkIn)

{

WORD SIOPortBase;

WORD BaudDivisor;

/* Check for valid unit */

if(Unit > 1)

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