From: Alain Senjean <senjean@club-internet.fr>
Subject: Help: accessing Bios param from Ada
Date: 1999/04/13
Date: 1999-04-13T21:05:06+00:00 [thread overview]
Message-ID: <3713B162.55EA70F7@club-internet.fr> (raw)
Hello,
I am using AdaObjet 7.1.2 under Win98 and i want to develop an application
software using the LPT port for managing an external HW equipment.
I need to identify the port base address and then use registers of the I/O
controller.
I know How, I have a working model of the port driver in Borland C++ (C
language under dos window) using inportb, outportb.
1) identification
--------------
I just need to read four 'words' at address 0000:0408 providing LPT ports
base address.
I am used to target cross developments using motorola memory model but
not to PC memory organisation (segment, offset).
So, I have tried something simple:
type T_Lpt_Bios_Table is array (T_Lpt_Port) of Basic_Types.Word;
Lpt_Bios_Table : T_Lpt_Bios_Table;
for Lpt_Bios_Table use at Basic_Types.Int_To_Addr(16#0000_0408#);
-- memory image
Lpt_Table : T_Lpt_Bios_Table := Lpt_Bios_Table;
where : Word: 0 .. 2**16, T_Lpt_Port: Lpt1 .. Lpt4
very optimistic I think because AdaObject is blocked upon previous line
execution and sometimes the PC itself!
I there any standard service to access Bios segment and retrieve
parameters.
I know this is system specific but It should be something available to
interface with low-level without using C langage (I hope).
Typically I want to avoid introducing a second language just for two or
three services.
2) management
----------
After, I want to manage this port using the base address found in the
previous BIOS table.
Again, first idea, simply by mapping at this address a three fields
volatile record (too simple I think).
Is there any defined service with parameters like (segment, offset, size,
value) for accessing HW ports like inportb, outportb in C ?
Please help me.
next reply other threads:[~1999-04-13 0:00 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-04-13 0:00 Alain Senjean [this message]
1999-04-14 0:00 ` Help: accessing Bios param from Ada Jerry van Dijk
1999-04-14 0:00 ` Alain Senjean
1999-04-14 0:00 ` Tom Moran
1999-04-15 0:00 ` Alain Senjean
1999-04-15 0:00 ` Ed Falis
1999-04-16 0:00 ` Alain Senjean
1999-04-15 0:00 ` Jerry van Dijk
1999-04-17 0:00 ` Alain Senjean
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