Converting a binary coded decimal value to hexadecimal

The best way is the direct one:

BINARY_VALUE =
FIRST_DIGIT * BINARY_HUNDRED_THOUSAND +
SECOND_DIGIT * BINARY_TEN_THOUSAND +
THIRD_DIGIT * BINARY_THOUSAND +
...

Regards,
M.

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 );

}