AVR Assembler Problem with DB (ATMega8)

Hello people. I'm sorry, before all, because I write a little of English.

I need to calculate the sinus (trigonometric function). This way:

-The angle will be entered by the PortB, and the sinus come back by the
PortD (multiply per 100)
-The calculation will be make with a table.
-The table must have in de flash memory ( Z ?)

This is de table (DB?):

0 10 20 30 40 50 60 70 80 90
0 17 34 50 64 77 87 94 98 100  (Sinus)
           
For example. If I have a 20 in PortB, I need that PortD have a 34.


I have this code, but I don't how continue...

INCLUDE "m8def.inc"

DEF n = R16
DEF suma = R17
DEF i = R18

ORG 0x0 rjmp inici

inici:

	
	//ldi XH, high(2*sinus) ; high(0x60)
	ldi ZL, low(2*angle)
	ldi ZH, high(2*sinus)
	angle:
		.DB "0 10 20 30 40 50 60 70 80 90 100",0
	sinus:
		.DB "0 17 34 50 64 77 87 94 98 100",0
	
	in n, PINB ; take n


fi:rjmp fi


Thank you!

Serafin schrieb:
> Hello people. I'm sorry, before all, because I write a little of English.
> 
> I need to calculate the sinus (trigonometric function). This way:
> 
> -The angle will be entered by the PortB, and the sinus come back by the
> PortD (multiply per 100)
> -The calculation will be make with a table.
> -The table must have in de flash memory ( Z ?)

The following is a quick, absolutely untested solution. Just a few words:
My sinus table is a sequence of sin(0�),sin(1�),sin(2�),... So you just 
read the degrees from port B, add them to the table start, read the 
value at that location with lpm, and send it to port D. lpm is limited 
to 64k flash, for larger flashes you need elpm.
The table only needs the values for 0..90�. For larger values you can 
use symmetries:
a>180�: sin(a)=-sin(a-180�)
then
90&#4294967295;<a<180&#4294967295;: sin(a)=sin(180&#4294967295;-a)
The implementation of these formula is left as an exercise.

; Sinus Table
sinus:    .DB   0,  2,  3,  5,  7,  9, 10, 12, 14, 16
           .DB  17, 19, 21, 22, 24, 26, 28, 29, 31, 33
           .DB  34, 36, 37, 39, 41, 42, 44, 45, 47, 48
           .DB  50, 52, 53, 54, 56, 57, 59, 60, 62, 63
           .DB  64, 66, 67, 68, 69, 71, 72, 73, 74, 75
           .DB  77, 78, 79, 80, 81, 82, 83, 84, 85, 86
           .DB  87, 87, 88, 89, 90, 91, 91, 92, 93, 93
           .DB  94, 95, 95, 96, 96, 97, 97, 97, 98, 98
           .DB  98, 99, 99, 99, 99,100,100,100,100,100
           .DB 100

start:    ldi R30,low(sinus)
           ldi R31,high(sinus)
           in R2, PINB
           clr R3
           add R30,R2
           adc R31,R3
           lpm R2, Z
           out PORTD, R2
           rjmp start

-- 
Mit freundlichen Gr&#4294967295;&#4294967295;en

Frank-Christian Kr&#4294967295;gel