binary 2 bcd .

Forum 2005-2010 (read only) Software Syntax & Programs
1

Hi , Is there a library to convert binary to bcd.

I want to display a reading from a ADC port and convert the 0 to 1023 to an array of bcd digits ( 4 ) to display on leds.

I can think of one way, eg use itoa and convert it to a a string then minus a number to can back to 0 to 9 , but is there a simple way than this ?

Thank in advance Peter

2

Some old processors do this automagically with built-in instructions, so I figured it wasn't really magic. Found this nice page with a useful algorithm:

http://www.engr.udayton.edu/faculty/jloomis/ece314/notes/devices/binary_to_BCD/bin_to_BCD.html

For sixteen bit numbers, you'll need three bytes to hold five BCD digits in nibbles, and your result won't be done until you've shifted sixteen times.