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movf a, w subwf b, w btfss STATUS, C else movf b, w subwf a, w btfsc STATUS, C endif else error Unknown if Condition endif endif endif
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To help determine if there is an error in the code, note that if no Condition test is true, an error is forced, indicating that the input condition is unknown. This can be another technique for debugging macros: If conditional code ends up somewhere where it shouldn t be, an error message will alert you to the situation and help you to debug the application. The macros themselves use conditional code to produce simple code for the actual functions. For example, in the code
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_ifv Parm1, >, Parm2 : ; _else : ; _end
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the best-case assembler would be
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; _ifv Parm1, >, Parm2 movf b, w subwf a, w btfss STATUS, C goto _ifelse1 ; : ; ; _else goto _ifend1 ; _ifelse1: : ; ; _end _ifend1:
Not True, Jump to else code Code to Execute if Parm1 > Parm2 Finished with true code, Jump to _end Code to Execute if Parm1 <= Parm2
If you try out the macros in structre.inc, you will nd that this is the exact code that is created for this example. To do this, I had to create three stacks to keep track of where I was. The rst stack records what is the nesting level of the structured conditional statements. For these macros, I only allow four nesting levels deep. The next stack
STRUCTURED PROGRAMMING MACROS
records what was the previous operation. This is important for _else, _end, and _until to make sure that they are responding correctly. The last stack records the label number for the previous operation. These stacks are combined with a label number to keep track of what is the correct label to use and jump to. The label number is appended to the end of the label using the #v(Number) feature of the MPASM macro assembler. When a label is encountered with this string at the end, the Number is evaluated and concatenated to the end of the string. For the label
_test#v(123)
the actual label recognized by MPASM would be
_test123
I use this feature to keep track of which label should be jumped to. After every statement, I increment this counter for the next statement to use for its labels. Expanding the preceding example to
_ifv Parm1, >, Parm2 _whilec ParmA == ParmB : : _end _else : _end
; ; ; ;
Code to Execute if Parm1 > Parm2 while ParmA == Constant ParmB End the _while Code to Execute if Parm1 <= Parm2
the structured programming macros will push the appropriate label number onto the stack and retrieve it when necessary. Thus, for the expanded example, the actual PIC microcontroller code would be
; _ifv Parm1, >, Parm2 movf b, w subwf a, w btfss STATUS, C goto _ifelse1 ; _whilec ParmA == ParmB _ifwhile2: movf ParmA, w subwf ParmB, w btfss STATUS, Z goto _ifend2 : : ; _end goto _ifwhile2 _ifend2:
Not True, Jump to else code
; ; ;
Code to Execute if Parm1 > Parm2 while ParmA == Constant ParmB End the _while
MACRO DEVELOPMENT
; _else goto _ifend1 _ifelse1: : ; _end _ifend1:
; Finished with true code, Jump to _end ; Code to Execute if Parm1 <= Parm2
I realize that this code is somewhat hard to follow, but if you work through it, you will discover that the _while loop is separate from the _if code by virtue of the label number, which is 2 for the _while and 1 for the _if. These values are kept track of by the three stacks I mentioned earlier. The stacks used for storing the label number and the other values are not stacks per se but actual variables that are shifted over by four and then loaded with the value. This limits the total label numbers to 16 different labels, but for most small PIC microcontroller applications, this should be suf cient. If you feel that more are needed, then you could modify the macros to use a separate stack for _if, _while, and _do, as well as come up with a way of having multiple stack values for each one. With a bit of work, you could have up to 64 label numbers for each type of structured programming macro by expanding the type of macro saved to four different types. The macros described in this section could be considered to come under the heading of out there. These macros involved quite a bit of work to get them to the point where they are now. After reading this chapter, you do have the knowledge to produce macros like this, but I want to caution you to think through what you are trying to accomplish. Macros, almost by de nition, do not produce functions that are easy to debug or even understand.
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