Intel 386 - Manual (Page 325)

Intel386™ EX EMBEDDED MICROPROCESSOR USER’S MANUAL
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SerialWriteChar:
Description:
Is a Polled serial port write function that waits forever or
until a character has been written to the serial port.
Parameters:
Unit Unit number of the serial port. 0 for SIO port 0,
1 for SIO port 1.
ch Character value to be written out
Returns:
None
Assumptions:
REMAPCFG register has Expanded I/O space access enabled (ESE bit set).
The processor Port pin are initialized separately.
Syntax:
#define SIO_0 0
char Char_Out = ‘a’;
SerialWriteChar (SIO_0, Char_Out);
Real/Protected Mode
No changes required.
*****************************************************************************/
void SerialWriteChar(int Unit, BYTE ch)
{
WORD TransmitPortAddr;
WORD StatusPortAddr;
/* Set Port base, based on serial port used */
TransmitPortAddr = (Unit ? TBR1 : TBR0);
StatusPortAddr = (Unit ? LSR1 : LSR0);
/* Wait until buffer is empty */
while(!(_GetEXRegByte(StatusPortAddr) & SIO_TX_BUF_EMPTY)) ;
_SetEXRegByte(TransmitPortAddr,ch);
}/* SerialWriteChar */
/*****************************************************************************
SerialWriteStr: