Converting 24 bit numbers into BCD for 7 segment displays

[mikoyan]

hi guys,

I'm looking for some advice. I'm using a PIC18F452 device and C language.

Basically, I have a 24 bit number that I need to output from the device, I've elected to use the standard I/O ports as I want my device to stand alone - i.e. not using the ascII option to hyperterminal.

I'm guessing the correct thing to do is to convert the binary value into BCD first, then break down the BCD number somehow (arrays) so that they can be put on the various port output lines... the execution of this is bugging me slightly, I'm not so good with C syntax (have been using FPGAs of late, only recently decided to have a go with PICs)

any advice is greatly appreciated.

 

[DavidT]

BoostC has sprintf, sprintf32 and an integer to decimal function. All populate an array which I then squirt at the lcd one by one. Perhaps your compiler has something similar. You will need to break your 24bit numbers into two for some of these to work.
David.

 

[colin mac]

Use a char variable for each 7-segment. If the number is 120, bitwise operators will split it into 3 chars with values 1, 2, and 0. Then output whatever code displays 1, 2, and 0 to a multiplexed display. Only 7 bits are needed.