Couple of sunday night questions...

h0ffman · 10 January 2011, 00:18

First one, although I'm sure I should know this... Really basic stuff but..

How do you convert hex to decimal so you can display it on screen??? For example, i want to show track 04 / 11, not track 04 / 0B. Or BPM 160 rathern than A0.

Second one, whats the best way to time a routine?

Cheers

KevG · 10 January 2011, 00:33

Everyone does it their own way, but for me....

1. I always convert to binary first. In Hex, each digit is 4 bits so you just convert the binary digits to decimal. Then convert the value of the decimal to a string to display it.

2. For timing I use a millisecs function (in what-ever language)
e.g....

Time1=Current time (in millisecs)
Your routine....
Time2=Current time (in millisecs)
TotalTime=Time2-Time1

Thats how I would do it. But no doubt someone else will post another way of doing it.

Hope that helps.

Kev G.

Galahad/FLT · 10 January 2011, 00:37

Quote:

Originally Posted by h0ffman

First one, although I'm sure I should know this... Really basic stuff but..

How do you convert hex to decimal so you can display it on screen??? For example, i want to show track 04 / 11, not track 04 / 0B. Or BPM 160 rathern than A0.

Second one, whats the best way to time a routine?

Cheers

Easiest way to time a routine is vertical blank, but the most accurate is CIA, but rarely does anyone bother to use the CIA to time.

As for Hex to Decimal: http://eab.abime.net/showpost.php?p=251559&postcount=5

Leffmann · 10 January 2011, 02:10

Generally, for picking a number apart into digits of an arbitrary base: divide your number by the base, the remainder will be the next higher digit, and you then use the quotient as the numerator and repeat this division until you are left with 0.

(I assume this is what you were looking for, or do you have an actual hexadecimal text string you want to convert?)

EDIT better explanation: take any number and keep dividing it by f.ex 10 until you are left with 0. The remainder of each division will be the value of the next higher digit.

Code:

         ; print any number up to 65535 as ascii

print    clr.l    d0
         move.w   value, d0
         lea      string+6, a0
         clr.b    -(a0)

loop     divu.w   #10, d0      ; format as base 10, decimal

         swap     d0           ; upper word contains remainder
         add.b    #"0", d0     ; which we convert to ascii
         move.b   d0, -(a0)    ; and store
         clr.w    d0

         swap     d0           ; lower word contains quotient
         bne      loop         ; repeat until quotient is 0

         rts                   ; A0 now points to our ascii string

string   ds.b     6

value    dc.w     48109

h0ffman · 10 January 2011, 10:42

Cheers Leffman, I'll be able to display the BPM now

Getting closer to completion. Mind you I still have the 16x16 scroller to do.

10 January 2011, 02:10	#4
Leffmann Join Date: Jul 2008 Location: Sweden Posts: 2,269	Generally, for picking a number apart into digits of an arbitrary base: divide your number by the base, the remainder will be the next higher digit, and you then use the quotient as the numerator and repeat this division until you are left with 0. (I assume this is what you were looking for, or do you have an actual hexadecimal text string you want to convert?) EDIT better explanation: take any number and keep dividing it by f.ex 10 until you are left with 0. The remainder of each division will be the value of the next higher digit. Code: ; print any number up to 65535 as ascii print clr.l d0 move.w value, d0 lea string+6, a0 clr.b -(a0) loop divu.w #10, d0 ; format as base 10, decimal swap d0 ; upper word contains remainder add.b #"0", d0 ; which we convert to ascii move.b d0, -(a0) ; and store clr.w d0 swap d0 ; lower word contains quotient bne loop ; repeat until quotient is 0 rts ; A0 now points to our ascii string string ds.b 6 value dc.w 48109 Last edited by Leffmann; 10 January 2011 at 02:21.

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10 January 2011, 00:18	#1
h0ffman Registered User Join Date: Aug 2008 Location: Salisbury Posts: 744	Couple of sunday night questions... First one, although I'm sure I should know this... Really basic stuff but.. How do you convert hex to decimal so you can display it on screen??? For example, i want to show track 04 / 11, not track 04 / 0B. Or BPM 160 rathern than A0. Second one, whats the best way to time a routine? Cheers

10 January 2011, 00:33	#2
KevG Banned Join Date: Jan 2009 Location: U.K. Posts: 93	Everyone does it their own way, but for me.... 1. I always convert to binary first. In Hex, each digit is 4 bits so you just convert the binary digits to decimal. Then convert the value of the decimal to a string to display it. 2. For timing I use a millisecs function (in what-ever language) e.g.... Time1=Current time (in millisecs) Your routine.... Time2=Current time (in millisecs) TotalTime=Time2-Time1 Thats how I would do it. But no doubt someone else will post another way of doing it. Hope that helps. Kev G.

10 January 2011, 10:42	#5
h0ffman Registered User Join Date: Aug 2008 Location: Salisbury Posts: 744	Cheers Leffman, I'll be able to display the BPM now Getting closer to completion. Mind you I still have the 16x16 scroller to do.

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