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

Hi,
 I seem to be here a lot today.. I have an interesting problem and it appears to be a compiler issue. I have the code:

ReadSwitches:
  Switches = SInp   
\ NOP   
  Switches = ~Switches
  \ nop

Return

 

 Which compiles to:

ReadSwitches:
MOV FSR,#Switches                                       ;  Switches = SInp   
MOV IND,SInp   
MOV FSR,#$10

NOP                                                             ;\ NOP

MOV FSR,#Switches                                       ; Switches = ~Switches

MOV W,/IND

MOV __PARAM2,W

MOV FSR,#$10

NOT __PARAM2

MOV FSR, #Switches

MOV IND,__PARAM2

MOV FSR,#$10

NOP                                                            ; \ nop

 

The problem is that the MOV W,/IND inverts the bits then the NOT __PARAM2,W does it again returning switches to the original state. I have used this successfully with switches in the Base page but when switches is at address $20 it does not work. 

 

Anyone got a clue? 

 

Thad

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