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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:
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:
Bit(s) | Description |
---|---|
7 | |
6 | |
5 | |
4 | |
3 | |
2 | |
1 | |
0 |