RS232 communication in Pascal

[Hebbe]

I would like to send and receive data via the RS232 COM port on the computer.

I know one can use the port array for simple tasks, but I've seen simple implementations of programming the UART-chip of the computer in DOS/Pascal environment. This code was posted at this forum about 2 years ago.

This program included initialization of the UART chip and an array type variable in pascal to use indepent from the interrupt-driven process in the UART.

So problem is I cannot find the example code, and would like if You know of similar examples.

 

[dkdude]

Hi Hebbe,

I would do it with inline assembler (or asm function) in TP/BP.

You need to know the details of INT 14h (that's a BIOS interrupt service for com ports).

Here's a reference link I found:

http://www.geocities.com/firepower_50ae/CodeNote/int14h.html

I did write a unit for this once in the past but cannot find it right now.

My response is only valid if you know ASM and interrupt services. Are you familiar with ASM programming in Pascal? If not -get back with a comment.

If you need to look at some examples, then try looking at SWAG :

http://www.gdsoft.com/swag/swag.html

Again, SWAG is only valid if you're an experienced programmer because some of the code snips are complex and not too good commented for novice programmers.

Hope you find my response helpfull §:O)

Good Luck


Jakob

 

[ppc386]

I think this might work:

http://www-user.rhrk.uni-kl.de/~kiesel/objcom/index.html

 

[realm174]

Although I never really understood the whole rs-232 thing, I do have a unit (bunch of files actually) that do zmodem. I was able to use a fair amount of procs from that unit, even tho I never really had a need for zmodem in that way. If you're interested, let me know where I can email it to.



Cheers,

Realm174