home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Pascal Super Library
/
Pascal Super Library (CW International)(1997).bin
/
SWAG
/
SWAGA_C
/
COMM.SWG
/
0016_Detect 16550A UART.pas
< prev
next >
Wrap
Pascal/Delphi Source File
|
1993-07-16
|
3KB
|
114 lines
{
From: Kai_Henningsen@ms.maus.de (Kai Henningsen)
Newsgroups: comp.dcom.modems
Subject: Help upgrade to 16550A
Date: Tue, 04 Aug 92 16:13:00 GMT
Organization: MausNet
Any noncommercial use allowed. For commercial, ask me - or use something
else. The ideas in this program are really very simple ... I seem to
remember most came from an article in DDJ.
}
program ShowUARTs;
uses
m7UtilLo;
type
tUART = (uNoUART, uBadUART, u8250, u16450, u16550, u16550a);
const
MCR = 4;
MSR = 6;
Scratch = 7;
FCR = 2;
IIR = 2;
LOOPBIT = $10;
function UARTat(UART: Word): tUART;
var
HoldMCR,
HoldMSR,
Holder : Byte;
begin {|UARTat}
HoldMCR := Port[UART + MCR];
Port[UART + MCR] := HoldMCR or LOOPBIT;
HoldMSR := Port[UART + MSR];
Port[UART + MCR] := $0A or LOOPBIT;
Holder := Port[UART + MSR] and $F0;
Port[UART + MSR] := HoldMSR;
Port[UART + MCR] := HoldMCR and not LOOPBIT;
if Holder <> $90 then begin
UARTat := uNoUART;
Exit
end {|if Holder<>$90};
Port[UART + Scratch] := $AA;
if Port[UART + Scratch] <> $AA then
UARTat := u8250
else begin
Port[UART + FCR] := $01;
Holder := Port[UART + IIR] and $C0;
case Holder of
$C0: UARTat := u16550a;
$80: UARTat := u16550;
$00: UARTat := u16450;
else UARTat := uBadUART;
end {|case Holder};
Port[UART + FCR] := $00;
end {|if Port[UART+Scratch]<>$AA else};
end {|UARTat};
procedure DisplayUARTat(UART: Word; name: string; num: Integer);
begin {|DisplayUARTat}
Write(Hex(UART, 4), ' ', name, num);
if UART = 0 then
Writeln(' not defined')
else
case UARTat(UART) of
uNoUART: Writeln(' not present');
uBadUART: Writeln(' broken');
u8250: Writeln(' 8250B');
u16450: Writeln(' 16450');
u16550: Writeln(' 16550');
u16550a: Writeln(' 16550A');
else Writeln(' unknown');
end {|case UARTat(UART)};
end {|DisplayUARTat};
var
i : Integer;
BIOSPortTab : array [1 .. 4] of Word absolute $40: 0;
begin {|ShowUARTs}
Writeln; Writeln;
Writeln('COM Port Detector');
Writeln;
for i := 1 to 4 do
DisplayUARTat($02E8 + $100 * (i and 1) + $10 * Ord(i < 3), 'Standard COM',
i);
Writeln;
for i := 3 to 8 do
DisplayUARTat($3220 + $1000 * ((i - 3) div 2) + $8 * Ord(not Odd(i)),
'PS/2 COM', i);
Writeln;
for i := 1 to 4 do
DisplayUARTat(BIOSPortTab[i], 'BIOS COM', i);
end {|ShowUARTs}.
m7utillo is a general utility unit I use a lot; all you need is this routine:
function Hex(v: Longint; w: Integer): String;
var
s : String;
i : Integer;
const
hexc : array [0 .. 15] of Char= '0123456789abcdef';
begin
s[0] := Chr(w);
for i := w downto 1 do begin
s[i] := hexc[v and $F];
v := v shr 4
end;
Hex := s;
end {Hex};