how to store or save to a memory location

Posted on 2004-05-01
Medium Priority
Last Modified: 2008-02-26
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
Question by:ransula

Author Comment

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
LVL 12

Accepted Solution

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


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