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Table of Contents
Note: This IBM PC BIOS API call is for DOS/Win16 personality only. Use Family API for portability.
Note: osFree Macro Library provides macros for most of functions
@AuxInit
Brief
Initialize serial port
Syntax
@AuxInit port, settings
Parameters
- port (WORD) - port number
- settings (BYTE) - port settings
Baud rates is passed in the high order 3 bits as follows:
000 = 110 baud
001 = 150 ''
010 = 300 ''
011 = 600 ''
100 = 1200 ''
101 = 2400 ''
110 = 4800 ''
111 = 9600 ''
Bits 4-3 define parity:
0 0 no parity
1 0 no parity
0 1 odd parity
1 1 even parity
Bit 2 defines stop bits:
0 1 stop bit;
1 2
Bits 1-0 character length:
1 0 7 bits
1 1 8 bits
Return
- AX - port status
Bitfields for serial line status (AH):
| Bit(s) | Description |
|---|---|
| 7 | timeout |
| 6 | transmit shift register empty |
| 5 | transmit holding register empty |
| 4 | break detected |
| 3 | framing error |
| 2 | parity error |
| 1 | overrun error |
| 0 | receive data ready |
Bitfields for modem status (AL):
| Bit(s) | Description |
|---|---|
| 7 | carrier detect |
| 6 | ring indicator |
| 5 | data set ready |
| 4 | clear to send |
| 3 | delta carrier detect |
| 2 | trailing edge of ring indicator |
| 1 | delta data set ready |
| 0 | delta clear to send |