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    array question in Assembly 68HC11


    Hello ppl!

    I have question about arrays in assembly 68HC11.
    I need to create an 8 byte array which holds my motor ids.
    So I recieve this byte 'id' from serial port which is from (0-7). I want to use that id as an index, to get the value in 'motor' array.

    Basicly I am trying to do this: MOTORID=MOTORARRY[MID]

    I dont have too much experience in Motorola processor.


    Here is what I did, and parts from the code & it compiles fine but does not work
    -----------

    Code:
    -reserving space for it
    MOTORARRY RMB	8		; stepper motor select array
    
    -storing array values.
    	LDAA	#%00000000
    	STAA	SPMTRARY
    	LDAA	#%00000001
    	STAA	SPMTRARY+1
    	LDAA	#%00000100
    	STAA	SPMTRARY+2
    	LDAA	#%00000101
    	STAA	SPMTRARY+3
    	LDAA	#%01000000	
    	STAA	SPMTRARY+4
    	LDAA	#%01000001
    	STAA	SPMTRARY+5
    	LDAA	#%01000100
    	STAA	SPMTRARY+6
    	LDAA	#%01000101
    	STAA	SPMTRARY+7
    
    -accessing part
    
    
    	JSR	GETCHE		; this subroutine saves the value on Acc A.	
    	STAA	MID		; stores A on to ID 
    	
    	LDD	MID
    	ADDD	#MOTORARRY
    	XGDX
    	LDD	0,X
    	STD	MOTORID
    Anybody can point out where I did the mistake or any other/better suggestions creating this array and accessing it.

    I would appreciate any help.

    Thanks.
  2. #2
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    Um... sorry if I can'thelp much... but here's what I think. I'm no assembly whiz but I used to do a bit of mips and when you wanted to read a byte or store a byte you needed a hiword offset and then another number from there.

    So what you can do is use the MOTOARRY but not use the [] becuase I don't even know if those can be used to make arrays or something (I told you I sucked..) You put that as the base and hiword address and then you just add a numer to it.
    Code:
        lbu $10, 0x0000($8)
        lbu $11, 0x0001($8)
        lbu $12, 0x0002($8)
        lbu $13, 0x0003($8)
        lbu $14, 0x0004($8)
    In here the $* things are registers and this loads a byte from $8 (base address)+0x0001 (the number of bytes away from the address) and stores it into register $11.

    So if you can get this sort of thing going that might be good enough.

    By the way... what you builing???!? It sounds pretty cool and I wanted to get into electronics or robotics anyway...
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    I need help with simple assembly bubble sort program, needs to sort 10 numbers


    I need help with assembly program to bubble sort 10 numbers

    jmartin732

    I have question about arrays in assembly 68HC11.
    I need to create an 8 byte array which holds my motor ids.
    So I recieve this byte 'id' from serial port which is from (0-7). I want to use that id as an index, to get the value in 'motor' array.

    Basicly I am trying to do this: MOTORID=MOTORARRY[MID]

    I dont have too much experience in Motorola processor.


    Here is what I did, and parts from the code & it compiles fine but does not work
    -----------

    Code:
    -reserving space for it
    MOTORARRY RMB	8		; stepper motor select array
    
    -storing array values.
    	LDAA	#%00000000
    	STAA	SPMTRARY
    	LDAA	#%00000001
    	STAA	SPMTRARY+1
    	LDAA	#%00000100
    	STAA	SPMTRARY+2
    	LDAA	#%00000101
    	STAA	SPMTRARY+3
    	LDAA	#%01000000	
    	STAA	SPMTRARY+4
    	LDAA	#%01000001
    	STAA	SPMTRARY+5
    	LDAA	#%01000100
    	STAA	SPMTRARY+6
    	LDAA	#%01000101
    	STAA	SPMTRARY+7
    
    -accessing part
    
    
    	JSR	GETCHE		; this subroutine saves the value on Acc A.	
    	STAA	MID		; stores A on to ID 
    	
    	LDD	MID
    	ADDD	#MOTORARRY
    	XGDX
    	LDD	0,X
    	STD	MOTORID
    Anybody can point out where I did the mistake or any other/better suggestions creating this array and accessing it.

    I would appreciate any help.

    Thanks.[/QUOTE]

    Comments on this post

    • Dave Sinkula disagrees : Let sleeping threads lie. Read the date of the last post before replying.
  6. #4
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    copy array


    Hello there!

    i am a beginner of shadow11 programming..
    Want to write a program to coppy 300 double-byte unsigned number from array1 to array2. The end of data in array1 marked as $FFFF. The data from array1 is coppy to array2 until marker found but if the marker not found all data go to array2.

    Could anybody help me...?

    Thank you

    Comments on this post

    • salem disagrees : Yet another "me too" grave digger - not even on-topic

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