7 segment display through C

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Hey guys .. i have very interesting thing. does anybody of you know how to display a number generated by a C program on 7 segment display instead of displaying it on a computer screen?

further details:
I wish to do it via 8255 ..
Is there any way to pass parameters to an assembly language (.asm) program through C program?
e.g.

C program

C

#include ....

void main ()
{
int a=2,b=2,x=a+b;
//passing 'x' to .asm program which will display '4' on 7 segment display.
}

Posted 30-Mar-10 21:22pm

rags112

Updated 30-Mar-10 22:46pm

CPallini

v2

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5 solutions

Solution 6

I would use IO-Warrior24->(I2C)->MAX6955. Once the parts are on your desk, its a matter of 60 minutes or so to put them together.

Posted 24-Jul-10 6:01am

RealSkydiver

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Sandeep Mewara 24-Jul-10 12:39pm

Reason for my vote of 1
Whats the point of replying to 3-4 month old question? By now, OP must have already moved on.

RealSkydiver 24-Jul-10 13:30pm

Well, you read it. I check my posts every now and than - so could the OP. Or, even if not, someone else might stumble across this post, years later. What's wrong with making their lifes easier?

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CPallini · Accepted Answer · 2010-03-30T21:26:00

Possibly you should first connect the display to the computer. You must read the display's technical documentation both for connecting the device to the PC, and to know how to programmatically access it.

OK, you would like to use the 8255 chip. Do you know how to connect the 8255 to the PC, then?

rags112 wrote:
Is there any way to pass parameters to an assembly language (.asm) program through C program?

Usually there is a way, you should check your C compiler's documentation.
However your problem looks quite different: you need to send data from the PC to the 8255 and, in turns to the LCD display).

:)

LittleYellowBird · Accepted Answer · 2010-03-30T21:40:00

If you want to display your data on an external 7 segment display, as CPallini says above, you will need to find a suitable display and interface circuit. This will need to connect either to the Serial Com port or the USB port.

If you can use the Serial Port (RS232) then something like this would be good ....

http://www.futurlec.com/4x7_Segment.shtml[^]

It will come with a data sheet of commands which will explain how to drive it.

Good Luck! :thumbsup:

r.ps · Accepted Answer · 2010-03-30T21:38:00

rags112 wrote:
instead of displaying it on a computer screen?

What do you mean by that?? You can't route what you display on the computer screen to a 7-segment display.

If you want to display a number on a 7 segment, there are several things you would need to figure out first;
for e.g. How do you plan to connect the display to the computer? serial or parallel connection? Is the display connected thorough a shift-register? and so on...

LittleYellowBird · Accepted Answer · 2010-03-30T23:25:00

Solution 5

I am sorry, I don't understand what you are trying to achieve here. The 8255 is a peripheral interface chip, so I guess you have an embedded system using a 8085 microprocessor or similar.

Is your 'C' code for the microprocessor or a PC? :)

Posted 30-Mar-10 23:25pm

LittleYellowBird

7 segment display through C

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