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Converting a binary coded decimal value to hexadecimal

Stephen McSpadden

Hello,

I'm new to the 8051 and I am hoping someone has had to solve a similar problem to this before, although this is not an 8051 specific problem.

Can someone give me assistance on how to convert a 12-digit binary coded decimal value to hexadecimal on the 8051? The BCD value is packed into 6 consecutive bytes.

Any help would be appreciated.

Regards,

Stephen McSpadden.

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    The following code will convert the array of BCD digits in variable bcd to a 32-bit binary value in hex.

    Of course, a 32-bit binary cannot hold the full range of values that you can get from 12 decimal digits. This code just indicates how to go about the conversion.

    main( void )
{

    data unsigned char bcd[6] = { 0x00, 0x00, 0x12, 0x34, 0x56, 0x78 };
    data unsigned char loop;
    data unsigned char data *p;
    data unsigned long hex;

    hex = 0;

    loop = sizeof( bcd );

    p = &bcd[0];

    do
    {
        hex = hex * 10;

        hex = hex + ( *p >> 4 );

        hex = hex * 10;

        hex = hex + ( *p & 0x0F );

        p++;

    }while( --loop != 0 );

}

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  • 0

    The following code will convert the array of BCD digits in variable bcd to a 32-bit binary value in hex.

    Of course, a 32-bit binary cannot hold the full range of values that you can get from 12 decimal digits. This code just indicates how to go about the conversion.

    main( void )
{

    data unsigned char bcd[6] = { 0x00, 0x00, 0x12, 0x34, 0x56, 0x78 };
    data unsigned char loop;
    data unsigned char data *p;
    data unsigned long hex;

    hex = 0;

    loop = sizeof( bcd );

    p = &bcd[0];

    do
    {
        hex = hex * 10;

        hex = hex + ( *p >> 4 );

        hex = hex * 10;

        hex = hex + ( *p & 0x0F );

        p++;

    }while( --loop != 0 );

}

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