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Tuesday, December 27, 2011

Data conversion in 8051 C


Packed BCD to ASCII

What to do??
Say number be 28
First separate 2 to get 02.
Second separate 8 to get 08.
Now add 30 to both to get 32 and 38 respectively.
Hence these are our ascii values.
#include<reg51.h>
void main()
{
                unsigned char x,y,z;
                unsigned char bytemy = 0x28;
                x = mybyte & 0x0F;     //mask lower 4 bits
                P1 = x | 0x30;         //make it ascii
                y = mybyte & 0xF0;     //mask upper 4 bits
                y = y >> 4;            //shift it to lower 4 bits
                P2 = y | 0x30;         //make it ascii
}// end of main
end of program

ASCII to Packed BCD.

What to do??
Say we have 2 ascii numbers 02 and 08.
We need to get say 28.
So shift 02 to 20.
Add 08 to it.
Hence this is our packed BCD.
#include<reg51.h>
void main()
{
                unsigned char myBCD;
                unsigned char x = '2',y='8';
                x = x & 0x0F;       //mask lower 4 bits just in case.
                x = x << 4;            //shift 4 left to make it upper digit
                y = y & 0x0F;       //just in case
                myBCD = x | y;  //combine to make BCD
                P1 = myBCD;
}// end of main
// end of program

1 comment:

  1. Interesting Blog

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    Thanks
    Manoj Singh

    ReplyDelete