Serial controller algorithm

hi all,
i would like to implement a serial controller controlling 7 segment display to c++.
Can anyone just give me an algorithm so i can apply it to c++ coding??i dont need the code just plain simple pseudo code will do.

The controller decodes incoming hexadecimal encoded in ASCII text stream.Assume input stream is stored in an input buffer from where the command handler reads each character. Valid commands are stored in the command buffer and a command handler reads them and executes them thereby updating the current display. the command is: [$] [UP/DOWN?STOP]. the $ is the start character for each command, UP increments the output value, DOWN decrements the output value while STOP sets the output value to 0 if the output is below 5. the output range is from 0 to 9.

> The controller decodes incoming hexadecimal encoded in ASCII text stream.
What kind of double-speak is this?

Does the controller receive say
$ UP

If so, then what is all that "hexadecimal encoded" mumbo jumbo?

The algorithm is very simple, you read a command, decode it, then take the appropriate action.

Try writing it as a console program first (input is keyboard, output is screen).

i know the basic stuff like input and output
i just need the body part of the algoirthm.
The controller controls 7 segment display. It either increment or decrements the digit displayed on the 7 segment display.

Code:

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input control stream: -------> decoder------->7 segment-----> output
{$UP....$DOWN....ect}

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That's all there is - what's the problem?

Maintain a variable which changes in response to UP/DOWN/STOP commands, then refresh your 7-segment display with the new value.

the problem is i need an algorithm so i can write a c++

You already have something resembling an algorithm in your text describing the problem - is there any part of the description of the problem that you find hard to understand or you want clarified, then please ask more precisely.

--
Mats

i would like a pseudo code for these:

input stream (algorithm for this)
Call (decoder) ( algorithm for this)
Call (7 Segment) ( algorithm for this)
Output outcome (algorithm for this)

This is the test data i will be using:
$up
$ = i, u = j, p = k;
For i from 1 to 127
For j from 1 to 127
For k from 1 to 127

"algorithm" for what appears to be a few lines of code is stretching the term somewhat.

Can you do this as a console program?

Code:

---

void displayOnSegmentDisplay ( int n ) {
  cout << "Display " << n << endl;
}

---

Like I said, get the logic working as a console program. If you write the input and output as two separate functions, then that is ALL you would need to rewrite when move to your controller. The rest of the program logic would be
a) untouched
b) known to work.

pseudo code is the process of telling you the step of what does the programme do with english terms and a bit of code in it
like this:

area of triangle:

input num1 and num2
compute area of triangle
area = 1 / 2 * num1 * num2
output area

just like that. so i want a code like that so i know how to implement to c++. makes life easier if there was a guideline. thank you

I'd say you've already written that much out.

what?if u dont wana help its okay

Quote:

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Originally Posted by kenneth_888

what?if u dont wana help its okay

---

It is one thing helping out with understanding things, or with the details of a problem. But if you are asking someone else to essentially write the code for you, then you're looking at the wrong place. Try some consulting service, perhaps. That is, if you are willing to pay for it.

--
Mats

im not askin for the code, just a guide line of how to write a serial controller code.
and i did say if u dont want to help its okay

No one is saying that we don't want to help you - but there's difference between giving help to solve a small part of a bigger problem, and sitting down to describe exactly what you need to do to solve the whole problem - especially as it seems like there's a pretty well-defined problem in your original text, so I ask again: Which part of the original problem description is it that you have a hard time dealing with?

--
Mats

i dont know where to start off writing the algorithm with the serial controller.
do i decode the hex into binary then binary corresponds to the segment table to display the digit out??

Make a list of 5 things you need to do.
For each thing, look at how simple it is and how you might write the code for it. If it's complicated, break it down into at most 5 more steps. Keep going until everything looks simple.

Eg, making tea.
1. Boil water
2. Add tea bag
3. Pour water
4. Add milk and sugar
5. Drink

So
1. Boil water
might be
1.1 Open kettle
1.2 Open tap
1.3 Add water
1.4 Close tap and kettle

Quote:

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Originally Posted by Salem

1. Boil water
2. Add tea bag
3. Pour water
#ifdef IS_ENGLISH
4. Add milk and sugar
4.1 Remove teabag
#else
4. Remove teabag
4.1 Add milk and sugar
#end
5. Drink

---

QuantumPete ;)

that depends on the controller's interface. what data do you have to send to him?