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where the mul and add statements pop the two top elements off the stack, perform the operations, and then push the result back onto the stack. The problem with the low-end and mid-range PIC microcontrollers is the lack of a data stack. This stack can be simulated using the macros:
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Push Macro incf FSR, f movwf INDF endm
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Pop Macro movf INDF, w decf FSR, f endm
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The rst macro will push the contents of the accumulator (w) onto the stack after incrementing the data stack pointer (FSR). I increment rst because if there is an interrupt, which also uses the stack, and the data was written to before the increment, there is the opportunity that the value put onto the stack is overwritten during the interrupt handler. The PIC18 processor architecture does not have this concern, as indirect addressing operations have the capability of incrementing and decrementing the FSR register during data transfers. Ideally, in a C language, the preincrement and postdecrement should be used to provide stack functions that are compatible with the statements above. Even though the PIC18 has the FSR preincrement and postdecrement operations, they do not have an offset add/subtract capability, which would make accessing stack data within subroutines easier. For example, the call and subroutine code:
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Subr(int YAxis, int ZAxis) { : Address = 4 + (YAxis * Width) + (ZAxis * Length * Width); : } // : A = Subr(j, k); End Subr
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requires accessing data on the stack at arbitrary locations. Before Subr is called, both the j and k variables are pushed onto the stack and accessed by the statements within Subr. For the Address assignment statement, these stack values have to be pulled off the stack along with pushing temporary values onto the stack. Assuming the preincrement and postdecrement push and pop operations described above, this statement would become:
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; Address = 4 + (YAxis * Width) + (ZAxis * Length * Width); push Stack - 1 ; Push ZAxis Stack Parameter push Length mul push Width mul push Stack - 3 ; Push YAxis Stack Parameter push Width mul add ; Add the Two Products Together push 4 add pop Address
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The problem is the Stack - 1 and Stack - 3 operations. In many other processors, an offset can be added to the index for carrying out an access. This is possible in the PIC18 with its ability to add the offset to the FSR register and the movff (move from le register to le register) instruction. In the low-end and mid-range PIC microcontroller architectures, the push Stack - n (which I call an offset push) operation would be executed as:
bcf INTCON, GIE ; ; ; ; Disable Interrupts in the Mid-Range PIC microcontrollers Decrement the Stack to the Correct Position
movlw n subwf FSR, f movf INDF, w movwf PushPopTemp movlw n + 1 addwf FSR, f bsf INTCON, GIE movf PushPopTemp, w movwf INDF
; ; ; ; ;
Increment to the Current Position + 1 for Push Enable Interrupts in the Mid-Range PIC microcontrollers Save the Data on the Stack
This is obviously quite a complex operation and it uses up a lot of execution cycles and space in the PIC microcontroller s program memory. In the PIC18, the data stack pushes and pops should use preincrements and postdecrements to make previous stack values be above the current position. By doing this, the code required to execute the Address assignment is:
movlw movff movff call 1 PLUSW0, POSTDEC0 Length, POSTDEC0 mul ; Push ZAxis onto the Stack ; Push the Previous Stack Element Again ; onto Stack ; Push Length onto the Stack ; Multiply the Two Top Stack Elements ; Together Push Width onto the Stack ; Push YAxis onto the Stack
movff Width, POSTDEC0 ; call mul movlw 3 movff PLUSW0, POSTDEC0 movff Width call mul call add movlw movwf call movff 4 POSTDEC0 add PREINC0, Address
; ; ;
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