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how to store or save to a memory location

Posted on 2004-05-01
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Last Modified: 2008-02-26
ok,
sorry that my last post was unclear to some of you.

here's my next question in regards to LC-3 assembly language.

i've read a string of chars, one char at a time. everytime i read a char from the console, i want to store it in a memory area (some memory block).

let's say the momory block should starts at x3201. so for example, if i read "hello" from the console, i want to store 'h' in x3201, 'e' in x3202 (ie x3201 offset by 1),
'l' in x3203 ... etc

this is what i'm done (and it's not working :-| ):
----------------------------------------------------
Data  .FILL  x3201

;so for the first char read, i do this (trying to store it)
;first char is in say R0

; R1 is a ptr to memory block, Data
LED R1,Data
 
; offset by 0, points R1 to first memory  slot
; i don't think this is right, but don' know any better
STR R1,R0,#0                      

the next time a char is read, i'll have to move the ptr to next memory slot and save the char there .... and so on. hope i've made it clear enough
-----------------------------

can anyone help
thanks
r
0
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Question by:ransula
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4 Comments
 

Author Comment

by:ransula
ID: 10968658
i'm reading a max of 20 chars
store the chars in memory starting at x3201 ...

i tried using
LDR R1,R0,#0

instead of
STR R1,R0,#0

but doesn't work either
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LVL 12

Accepted Solution

by:
stefan73 earned 500 total points
ID: 10975751
Hi ransula,
> ; offset by 0, points R1 to first memory  slot
> ; i don't think this is right, but don' know any better
> STR R1,R0,#0                      

The order is not correct. Try
STR R0,R1,#0

instead. You can also use
ST R0,R1
...as you offset is 0.

So if you want to store your characters, you need to increase R1 at loop end
ADD R1,R1,#1
...and store your R0 value:
ST R0,R1



Cheers,
Stefan
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