I have this troubling programming problem. I really hope I can get help from experts here

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1. Add two numbers residing in the memory locations FC40 and FC41. Place the sum in the memory location FC42. Execute the program by pressing the key F1

2. In chip programming, write a program in assembly using any simulator to do the following:
I. Send the first number (zero) to accumulator
II. Convert content of accumulator to the segment equivalence and store in memory (say memory x)
III. send the content of memory x to port 1
IV. Call a delay subroutine
V. Increment accumulator and repeat II - IV till you get to number 9
VI. Start afresh

3. Write a program to add 8 and 3 then send your result to port 1 of the micro controller and use eight LEDs to declare the result

What I have tried:

Don't have an idea chip programming and not good in c++

Posted 4-Jan-20 1:25am

Member 14706820

Updated 4-Jan-20 6:51am

RickZeeland

v2

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RickZeeland · Accepted Answer · 2020-01-04T01:56:00

Solution 1

This is not a C or C++ problem, but an Assembly language problem.
Here is a tutorial: Assembly Programming Tutorial - Tutorialspoint[^]

It seems the question is about Siemens PLC programming, see: Siemens S7 PLC Simulation Software - Contrologica[^]

Posted 4-Jan-20 1:56am

RickZeeland

Updated 4-Jan-20 6:30am

v3

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Member 14706820 4-Jan-20 10:27am

Thanks...
I was able to come up with this

Mov fc40, '3'
sub fc40, '0'

Mov fc41, '4'
Sub fc41, '0'

Add fc40, fc41
Add fc40, '0'

Mov fc42, fc40

------
The part of executing the program by pressing the key F1 is where I don't really understand.
Still attempting q2 and 3

RickZeeland 4-Jan-20 10:44am

Apparently you are expected to use the TASM assembler, see: https://stackoverflow.com/questions/15116531/nasm-input-output-to-window

Member 14706820 4-Jan-20 10:54am

Thank you so much... That was helpful... If I run into any more challenges in the other Qs I'll ask.. Thank you

OriginalGriff · Accepted Answer · 2020-01-04T02:06:00

Solution 2

We are more than willing to help those that are stuck: but that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for us to do it all for you.

So we need you to do the work, and we will help you when you get stuck. That doesn't mean we will give you a step by step solution you can hand in!
Start by explaining where you are at the moment, and what the next step in the process is. Then tell us what you have tried to get that next step working, and what happened when you did.

Posted 4-Jan-20 2:06am

OriginalGriff

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Member 14706820 4-Jan-20 10:30am

Thanks...
I was able to come up with this

Mov fc40, '3'
sub fc40, '0'

Mov fc41, '4'
Sub fc41, '0'

Add fc40, fc41
Add fc40, '0'

Mov fc42, fc40

------
The part of executing the program by pressing the key F1 is where I don't really understand.
Still attempting q2 and 3

OriginalGriff 4-Jan-20 10:53am

'm not convinced any of that is actually right - it looks like no valid assembler I've seen. FC40, FC41, and FC42 look like Hex addresses to me, and should probably be preceded by "0x" (or start with "0" and end with "h") to let the assembler know.
And the Add syntax looks unlikely, particularly since the rest of the question starts talking about an accumulator, which is normally the target of an Add operation (and SUB, come to that) in processors that use them.

I'd suggest that you look at your uController instruction set again - I'm pretty sure that even not knowing which processor you are use that isn't right...

Member 14706820 4-Jan-20 11:03am

In Q1 fc40, fc41 and fc42 seem to be just randomly chosen memory locations. Its to be answered just theoretically I guess

OriginalGriff 4-Jan-20 11:22am

That still doesn't mean that the assembler doesn't need to know what you are passing and what "type" of number it is. How is it supposed to that
Add fc40, fc41
is using two memory locations, while
Add fc40, '0'
is only using one?

Seriously, check the processor instruction set again - I've used a lot of processors over the years and they all needed to be told absolutely what they are doing and with what!

Member 14706820 4-Jan-20 14:53pm

According to the tutorial I saw, the sub and add of '0' is for conversion between ASCII and decimal... But I understand what you mean though. Please what do you suggest I do?

RickZeeland 4-Jan-20 12:31pm

It seems the question is about Siemens PLC programming.

Member 14706820 4-Jan-20 14:59pm

Siemens PLC programming.. Wow.. This looks thick. I don't know how to even approach it. Quick question, what question in particular am I using Siemens PLC programming

RickZeeland 4-Jan-20 15:43pm

I'm not a PLC programmer, but it looks like all questions are about PLC programming, maybe you can better ask questions on a Siemens forum or more PLC oriented site, CodeProject is more about .NET and C++ programming ...

Member 14706820 4-Jan-20 15:46pm

OK then... Thanks

Member 14706820 4-Jan-20 15:13pm

I'm trying to solve Q2 using qtspim simulator.. Do you suggest any other simulator?