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

Bamse,
  If you only using the SHIFTIN and SHIFTOUT commands, it wouldn't be too hard to make specialized versions that WOULD allow different pins to be used. If you don't need high speed, you could probably write them in SX/B too.
 

  I would use a method of numbering the pins from RA.0 to RC.7 with number from 0 to 23 (I know that RA.3-RA.7 don't exist, but it makes the code easier to pretend they do). Then do something like:




[code]
'UNTESTED CODE 

  

pinNumber VAR Byte 

pinBit    VAR Byte 

pinAddr   VAR Byte 

  

PinHigh  SUB 1 


  

PinHigh: 

  pinNumber = __PARAM1                      ' Get passed pin number (0 to 23) 

  pinBit = pinNumber AND 7                  ' Get pin bit position 

  pinBit = 1 << pinBit                      ' Make pin mask 

  pinAddr = pinNumber >> 3                  ' Get pin port address 

  pinAddr = pinAddr + @RA                   ' Start at port RA (notice @) 

  __RAM(pinAddr) = __RAM(pinAddr) OR pinBit ' Set the port bit high 

  RETURN 

  
[/code]
  I would just make routines to set a pin number high and low. Then just call them as needed in your higher level subroutines (like shiftout).
 

  Let me know if you need for info, but I think that will work for ya.

 

Bean.

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