hex to dec conversion(16 bit) on microcontroller interfaced with adc

[pamulapati alekya]

hi,

can anybody help in giving me the working link of hex to decimal coversion on a micro controller...

and can you say what is the difference between this program when it is used for 16 bit and 8 bit seperatly.?

regards.

 

[xpress_embedo]

Here is the Conversion Logic:-

temp = MYDATA * 2;    //MYDATA is the data coming from the PORT of the Controller to which your ADC of 8bit is connected
        //Conversion Process Starts Here       
            ones = temp%10;
            temp = temp/10;
            tens = temp%10;
            hundreds = temp/10;

And to display it on LCD just add 0x30H to each it will make it ASCII value..
If u don't understand then inform us..
We will try to help u properly...


You can see the Example at the following link... Voltmeter using AT89C51

ADC Interfacing - MATLAB ACADEMY

If u are using a controller of 10-Bit inbuilt ADC as in PIC

u can use the following logic...

//Here ADRESL stores lower bytes and ADRESH stores Higher Bytes
                adc_data = ADRESH & 0x00FF;
		adc_data = adc_data<<8;
		adc_data = adc_data | ADRESL;

Hope this assist u..

 

[Tahmid]

Here is the Conversion Logic:-

temp = MYDATA * 2;    //MYDATA is the data coming from the PORT of the Controller to which your ADC of 8bit is connected
        //Conversion Process Starts Here       
            ones = temp%10;
            temp = temp/10;
            tens = temp%10;
            hundreds = temp/10;

I think there is a mistake here. The code should be:

temp = MYDATA;    //MYDATA is the data coming from the PORT of the Controller to which your ADC of 8bit is connected
        //Conversion Process Starts Here       
            ones = temp%10;
            temp = temp/10;
            tens = temp%10;
            hundreds = temp/10;

Let's say that MYDATA holds the value 249. In the code you provided, temp = 249 * 2 = 498 (provided temp is a 16-bit register, or atleast ≧ 9 bits). Then, ones = 8, tens = 9, hundreds = 4.
But, in my code, temp = MYDATA = 249. Ones = 9, tens = 4, hundreds = 2.

Hope this helps.
Tahmid.

 

[xpress_embedo]

Yes Tahmid u are absolutely right..

Actually that was a copy paste code from the site MATLAB ACADEMY...

and in that code they are making a voltmeter using ADC... that's why they require to multiply the data by 2 (exactly 1.953)..

But yes u right..
It is my mistake to put that code at that post..
Sorry..Dear

 

[jpanhalt]

What language do you want, C or Assembly?
Do you want full 16-bit to BCD or will 12-bit do for you?

I have a fairly thick folder of such routines in Assembly copied from others. The one I am currently using is 12-bit by Peter Hemsley (PicList) and that works well for most A/D converters. There are many other options. If you want to see some of the options, go to PicList and search on Radix in conversions (PIC Microcontoller Radix Math Methods ).

John

 

[pamulapati alekya]

could you please explain me the logic behind 0*30h..
as we however need to display on lcd by ascii values...

 

[xpress_embedo]

To display 1 in integer on LCD, you have to send 0x31 its ascii code..
That's why
0 ----- > 0x30
1 ----- > 0x31
2 ----- > 0x32
3 ----- > 0x33
4 ----- > 0x34
5 ----- > 0x35
6 ----- > 0x36
7 ----- > 0x37
8 ----- > 0x38
9 ----- > 0x39

or u just OR (|) your result with 0x30...


This is all done to display data on LCD..

 

[pamulapati alekya]

we are doing it in assembly level language. on 8 bit adc of 16 channel but using only two channels for giving input other all channels are left opened.

---------- Post added at 07:29 ---------- Previous post was at 07:27 ----------

we are doing it in assembly level language in serial mode. on 8 bit adc of 16 channel but using only two channels for giving input other all channels are left opened. did this code works for this one.. :!: because it seems like c language.

 

[jpanhalt]

Go to PicList.com as mentioned above. I found the 12Bit to BCD by Hemsley (second link, near bottom) quite easy to install, and it worked.

PIC Microcontoller Radix Math Methods

10bit to BCD unpacked 4 digit in 38 inst ~88 cycles by E. A. Grens

John

 

[Tahmid]

we are doing it in assembly level language. on 8 bit adc of 16 channel but using only two channels for giving input other all channels are left opened.

---------- Post added at 07:29 ---------- Previous post was at 07:27 ----------

we are doing it in assembly level language in serial mode. on 8 bit adc of 16 channel but using only two channels for giving input other all channels are left opened. did this code works for this one.. :!: because it seems like c language.

It won't work for you because it's in C. Do as jpanhalt has said and you can find the assembly routines.