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