indirect addressing

Amr Hassan · Oct 30, 2006

i have an array of words in db1

i want to display the content of word 0 on the first positve edge
of m10.0 word 2 on the seond and so on

the way i naturlly do so is that i calculate the address and

then :

l mw[md 100]
t mw 200

how can i do so using pointers ?

thanks

SimonGoldsworthy · Oct 30, 2006

What will you display before the first positive edge, what happens when you reach the end of the array, can you reset the index back to zero at any time ?

Amr Hassan · Oct 30, 2006

i want a display the first entry , if reached the end to display lat entry and yes i want to be able to reset

SimonGoldsworthy · Oct 30, 2006

So, before the first edge, the display shows entry 0, after the first positive edge, the display shows entry 0, after the second positive edge, the display shows entry 1 etc.
(The array is 0 based
Array[0]
Array[1]
Array[2]....
)

Amr Hassan · Oct 30, 2006

yes exactly

Amr Hassan · Oct 30, 2006

i have tried this

OPN DB 1
LAR1 P#DBX 0.0
L W [AR1,P#0.0]
T MW 2

this pointed to the first word in the data block
when i wrote

OPN DB 1
LAR1 P#DBX 0.0
L W [AR1,P#2.0]
T MW 2

it pointed to the second word

now is there a way to increase this offset through the program?

SimonGoldsworthy · Oct 30, 2006

All you can do is increase the offset in a stored variable and then add the offset to AR1.

Amr Hassan · Oct 30, 2006

please explain how

SimonGoldsworthy · Oct 30, 2006

Assume your array index is held in MD1000, then the following code could be used:

Code:

	  OPN   DB	 1
	  LAR1  P#DBX 0.0
	  L	 MD  1000
	  SLD   4
	  +AR1  
	  L	 W [AR1,P#0.0]
	  T	 MW	 2

Amr Hassan · Oct 30, 2006

Thanx a lot

indirect addressing

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