BCD to BINARY Converter?

[fingerstyle86]

His guys i am new here, I would just like to ask does anyone know what commands i can use to convert BCD to BINARY or vice versa?

Thanks!

 

[westaust55]

There is no direct command.

Depending how many variables you have available and whether you want the result in a single byte or each digit in a separate byte, there are several options.

1 You can use the BCDTOASCII and then subract $30 (ie "0") from each digit

BCDTOASCII b0, b1, b2 ; BCD value in b0, tens into b1, units into b2
b1 = b1 - $30
b2 = b2 - $30
b0 = b1 * 10 + b2

or

2. in simple maths using 2 varaibles
if b0 = 59 BCD and you want 59 decimal or $3B (hex)
b1 = b0 / 16 * 10
b0 = b0 AND $0F + b1

 

[fingerstyle86]

thanks westaust!!I appreciate it!

 

[hippy]

It's mainly a matter of groups-of-bits manipulation, and to save simply re-typing ...

http://www.hippy.freeserve.co.uk/picaxeq2.htm#How_do_I_convert_between_Decimal_and_BCD

 

[fingerstyle86]

Thanks guys you have been a great help!