Calling TC function from TASM

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3 total messages Started by Charlie McIver Wed, 13 Jan 1999 00:00

#118

Author: Charlie McIver
Date: Wed, 13 Jan 1999 00:00

24 lines
1564 bytes

Hi,

Firstly, I'm just getting into the details of assembler programming so
apologies if I seem a little ignorant.

I've got quite alot of experience of 80C51 and compatibles (though all are
embedded single chip microcontrollers so a doddle to use)

I'm using an 186 chip in an embedded application for my university project.
As I understand it I'm going to have start my initialisation in Assembler,
and I have an example of this which works. I then would like to jump into
Turbo C for most of the donkey work, dropping back to assembler when
required.

I've used TC and TASM before and as I recall it wasn't too hard, but how do
I do the initital jump from
Assembler to C?

Also, does anyone know of any good Serial Comms libraries that do not use
BIOS/DOS, but simple talk to the UART?

Many thanks from a keen newbie!

Charlie McIver

Re: Calling TC function from TASM

#119

Author: David Lindauer
Date: Wed, 13 Jan 1999 00:00

31 lines
1890 bytes

Charlie McIver wrote:

> Hi,
>
> I've used TC and TASM before and as I recall it wasn't too hard, but how do
> I do the initital jump from
> Assembler to C?

generally you do this through a call to the _main function (e.g. call _main).
In an embedded project it is also possible to jump directly to main, if you are
sure main isn't going to return.

>
>
> Also, does anyone know of any good Serial Comms libraries that do not use
> BIOS/DOS, but simple talk to the UART?

Did you look around on simtelnet?   I was told there is example code therefor
handling uarts directly.

David

--
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David Lindauer    mailto:camille@bluegrass.net     ICQ: 8699592

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Re: Calling TC function from TASM

#120

Author: black_phantom
Date: Thu, 14 Jan 1999 00:00

32 lines
1889 bytes

> I've used TC and TASM before and as I recall it wasn't too hard, but how do
> I do the initital jump from
> Assembler to C?

In ASM file:

EXTRN _c_entry: near ; far for compact, large and huge memory models

call _c_entry
; Some termination code here - if c_entry() will return.

In C file:

c_entry()
{
}

Similar approach I saw in "Writing OS/2 device drivers in C" - there an author
called _main function this way (put params first).

> Also, does anyone know of any good Serial Comms libraries that do not use
> BIOS/DOS, but simple talk to the UART?

http://www.geocities.com/SiliconValley/Bay/8302/serial1.htm
is a pretty on-line tutorial on COM.


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