How can i convert 16 bit number to decimal ?

EDAboard.com Forum Index -> Microcontrollers -> How can i convert 16 bit number to decimal ?

Author

Message

SphinX

Joined: 25 Jan 2002
Posts: 1069
Helped: 28
Location: EGYPT

30 Mar 2004 16:19 bin16 2 bcd microchip

Hi,

In my work we need to convert 16 bit number to decimal using ATMEL.

Ex. This number 65535 ----> R0=6 R1=5 R2=5 R3=3 R4=5

I need just an idea only.
I know a method for 8 bit conversion but what about 16 bit number.

Please help me or i will be fired Sad

Sphinx

Google
AdSense
Google Adsense

30 Mar 2004 16:19 Ads

SphinX

Joined: 25 Jan 2002
Posts: 1069
Helped: 28
Location: EGYPT

30 Mar 2004 16:28 how to convert 16 bit to 8 bit atmel

Hi,

I found a routine using PIC at
http://www.piclist.com/techref/microchip/math/radix/b2a-16b4a-ng.htm

But there are strange instruction

skpc
skpnc
IFNDEF known_zero

What these instructions do?

Thanx

Gorilla

Joined: 13 Jan 2003
Posts: 92
Helped: 9

30 Mar 2004 16:33 decimal to 16 bit converter

Look for binary to BCD conversion algorithms, there are a lot of examples online.

By the way: 'ATMEL' does not say a lot about the architercture you are using. They sell MARC4, 8051, AVR and ARM based cores...

Anyway, here is one example in 8051 assembly:

http://www.8052.com/codelib/bintoasc.asm

SphinX

Joined: 25 Jan 2002
Posts: 1069
Helped: 28
Location: EGYPT

30 Mar 2004 16:58 16 bit number to decimal

Hi Gorilla,

:multi: THANX VERY MUCH. :multi:
We use 8051 mcu.

SphinX

svicent

Joined: 11 Jul 2001
Posts: 413
Helped: 23

31 Mar 2004 14:43 Re: How can i convert 16 bit number to decimal ?

Hi SphinX

This is my 8051 version to convert 16 bit number to decimal:

; FUNCTION: BIN2BCD
; BYTES: 27
; CYCLES: 327
; INPUT: R6 (Msb) and R7 (Lsb) (binary_16_bits)
; OUTPUT: R3 (Msb), R4 and R5 (Lsb) (PACKET BCD)
; Destroy: R2, R6, R7, A, and PSW
;
; ALGORITM:
;
; BCD = 0;
; COUNT = 16; // (TO PROCESS 16 BITS)
; do {
; BIN16 = BIN16 * 2
; BCD = BCD * 2 + CARRY
; COUNT = COUNT - 1
; } while (COUNT != 0);
;

BIN2BCD:
CLR A ; BCD = 0
MOV R5,A
MOV R4,A
MOV R3,A

MOV R2,#16 ; TO PROCESS 16 BITS

BIN_10:
MOV A,R7 ; BIN16 = BIN16 * 2
ADD A,R7
MOV R7,A
MOV A,R6
ADDC A,R6 ; CARRY = MSB of BIN16
MOV R6,A

MOV A,R5 ; BCD = BCD * 2 + CARRY
ADDC A,R5
DA A
MOV R5,A

MOV A,R4
ADDC A,R4
DA A
MOV R4,A

MOV A,R3
ADDC A,R3
DA A
MOV R3,A

DJNZ R2,BIN_10
RET

Best regards.

artem

Joined: 22 May 2003
Posts: 1652
Helped: 91
Location: Turan

31 Mar 2004 18:56 How can i convert 16 bit number to decimal ?

Hi SphinX

There were few topics related to hex to bcd conversion . But especially for ATMEL there is Atmel's written high efficiency routines for BCD arithmetics (see application notes for AVR on www.atmel.com ) . Those are written in asm and execute faster than C implementation .