In SX Microcontrollers, SX/B Compiler and SX-Key Tool, jdemeyer wrote:

I have a few places in code where I move bytes around like this:

[code]
FOR Index=0 to 6
    There(Index)=Here(Index)
NEXT
[/code]

Since I have a few places, I would rather have a subroutine to call such as

MoveBytes Here,There, 6

I'm not familiar with a couple things.

1) How might I pass the address of a memory location to a subroutine?
2) Once I am in the subroutine, how might I read one location and place it in another?
3) Did I make this too hard?

This was my attempt:

[code]
temp1=4
ASM
MOV __PARAM1,#Here & $FF
MOV __PARAM2,#Here >> 8
MOV __PARAM3,#There & $FF
MOV __PARAM4,#There >> 8
MOV FSR,#__PARAMCNT
MOV IND,#4
MOV FSR,#$10 
CALL @__MoveBytes
ENDASM

MoveBytes:
temp2=__PARAM1
temp3=__PARAM2
tempA=__PARAM3
tempB=__PARAM4
FOR ACount=0 to temp1
	READ temp2+temp3,temp4
	ASM
		MOV FSR,#tempA+tempB
		MOV IND,temp4
		INC tempB
	ENDASM
NEXT

RETURN
[/code]

I'd much rather prefer something like

[code]
MOV W,#Here                ;                      There(Index)=Here(Index)
ADD W,Index                     
MOV FSR,W                     
MOV __PARAM2,IND              
MOV FSR,#$10                  
MOV W,#There          
ADD W,Index                     
MOV FSR,W                     
MOV IND,__PARAM2
[/code]

But I'm not sure how to set up the address indirection.

Joe

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