oryginalny program wyglada tak taki dostałem od nauczyciela mam z nim zrobic
Rewrite the delay section of the program as a subroutine with annotations. Also include a flowchart of the overall program and explain the advantage a subroutine might have over keeping the delay section within the main program.
1. ; File CHASER.ASM
2. ; Blinks LEDs on outputs (Port B) in a rotating pattern.
3. ; Reverses direction if port A, Bit 0, is high.
4. processor 16f84
5. include <p16f84.inc>
6. __config _RC_OSC & _WDT_OFF & _PWRTE_ON
7. ; Give names to 2 memory locations (registers)
8. J equ H’1F’ ; J = address hex 1F
9. K equ H’1E’ ; K = address hex 1E
10. ; Program
11. org 0 ; start at address 0
12. ; Set Port B to output and initialize it.
13. movlw B’00000000’ ;
14. tris PORTB ;
15. movlw B’00000001’ ;
16. movwf PORTB ;
17. bcf STATUS,C ;
18. ; Main loop. Check Port A, Bit 0, and rotate either left or right through the carry register.
19. mloop:
20. btfss PORTA,0 ;
21. goto m1
22. rlf PORTB,f ;
23. goto m2
24. m1:
25. rrf PORTB,f ;
26. m2:
27. ; Add a delay
28. movlw h’32’ ;
29. movwf J ;
30. jloop: movwf K ;
31. kloop: decfsz K,f ;
32. goto kloop
33. decfsz J,f ;
34. goto jloop
35. movlw 02h ;
36. ;Possibly change LED direction
37. xorwf PORTA,0;
38. goto mloop ;
39. end ;
tak to pozmieniałem czy jest ktos to wstanie posprawdzać
File CHASER.ASM
; Blinks LEDs on outputs (Port B) in a rotating pattern.
; Reverses direction if port A, Bit 0, is high.
processor 16f84
include <p16f84.inc>
__config _RC_OSC & _WDT_OFF & _PWRTE_ON
; Give names to 2 memory locations (registers)
J equ H’1F’ ; J = address hex 1F
K equ H’1E’ ; K = address hex 1E
; Program
org 0 ; start at address 0
; Set Port B to output and initialize it.
movlw B’00000000’ ; put binary ’00000000’ in the working register
tris PORTB ; copy W to port B control register
movlw B’00000001’ ; put binary ’00000001’ in the working register
movwf PORTB ; copy the Wreg to PORTB
bcf STATUS,C ; clear the carry bit
; Main loop. Check Port A, Bit 0, and rotate either left or right through the carry register.
mloop:
btfss PORTA,0 ; ; skip next instruction if bit=1
goto m1
rlf PORTB,f ; rotate port B bits to left
goto m2
m1:
rrf PORTB,f ; rotate port B bits to right
m2:
; add a Delay
call Delay ; call subroutine to slow the LED
movlw 02h; copy the 02h into working register
;Possibly change LED direction
xorwf PORTA,0; Toggle the LED
goto mloop ;
;Here is Subroutine
Delay
movlw h’32’ ; w := 32 hex
movwf J ; J := w
jloop: movwf K ; K := w
kloop: decfsz K,f ; K := K-1, skip next if zero
goto kloop ; repeat kloop if delay is not zero
decfsz J,f ; J := J-1, decrement register skip next if zero
goto jloop ; repeat jloop if delay is not zero
Return ;When finished return to main, return from call, location of nex
end ; program ends here
A subroutine is a section of code, or program, than can be called as and when you need it. Subroutines are used if we are performing the same function more than once, for example creating a delay. The advantages of using a subroutine are that it will be easier to alter the value once inside a subroutine rather than, say, ten times throughout your program, and also it helps to reduce the amount of memory in our program occupies inside the PIC.
The advantages of breaking a program into subroutines :
• Decomposing a complex programming task into simpler steps: this is one of the two main tools of structured programming, along with data structures
• Reducing duplicate code within a program
• Enabling reuse of code across multiple programs
• Dividing a large programming task among various programmers, or various stages of a project
• Hiding implementation details from users of the subroutine
Linkia
Rewrite the delay section of the program again using a built-in Timer0 function with annotations. Also explain with aid of a diagram how the timer function counts the delay and the advantage a function might have over keeping the delay section in the main program
; File CHASER.ASM
; Blinks LEDs on outputs (Port B) in a rotating pattern.
; Reverses direction if port A, Bit 0, is high.
Clock : XTAL 4 MHz
processor 16f84
include <p16f84.inc>
__config _RC_OSC & _WDT_OFF & _PWRTE_ON
; Program
org 0 ; start at address 0
; Set Port B to output and initialize it.
Movlw ;configure Timer0 with
movlw B’00000000’ ; put binary ’00000000’ in the working register
tris PORTB ; copy W to port B control register
movlw B’00000001’ ; put binary ’00000001’ in the working register
movwf PORTB ; copy the Wreg to PORTB
bcf STATUS,C ; clear the carry bit
; Main loop. Check Port A, Bit 0, and rotate either left or right through the carry register.
mloop:
btfss PORTA,0 ; ; skip next instruction if bit=1
goto m1
rlf PORTB,f ; rotate port B bits to left
goto m2
m1:
rrf PORTB,f ; rotate port B bits to right
m2:
BTFSS INTCOM ,T0IF ; wait here until Timer0 count rolls over
GOTO MainLoop ; loop for ??????
BCF INTCON, T0IF ; bit (flag)must be cleared in software
movlw 02h; copy the02h into working register
;Possibly change LED direction
xorwf PORTA,0; Toggle the LED
goto mloop ;
end ; program ends here
prosze o pomoc
Rewrite the delay section of the program as a subroutine with annotations. Also include a flowchart of the overall program and explain the advantage a subroutine might have over keeping the delay section within the main program.
1. ; File CHASER.ASM
2. ; Blinks LEDs on outputs (Port B) in a rotating pattern.
3. ; Reverses direction if port A, Bit 0, is high.
4. processor 16f84
5. include <p16f84.inc>
6. __config _RC_OSC & _WDT_OFF & _PWRTE_ON
7. ; Give names to 2 memory locations (registers)
8. J equ H’1F’ ; J = address hex 1F
9. K equ H’1E’ ; K = address hex 1E
10. ; Program
11. org 0 ; start at address 0
12. ; Set Port B to output and initialize it.
13. movlw B’00000000’ ;
14. tris PORTB ;
15. movlw B’00000001’ ;
16. movwf PORTB ;
17. bcf STATUS,C ;
18. ; Main loop. Check Port A, Bit 0, and rotate either left or right through the carry register.
19. mloop:
20. btfss PORTA,0 ;
21. goto m1
22. rlf PORTB,f ;
23. goto m2
24. m1:
25. rrf PORTB,f ;
26. m2:
27. ; Add a delay
28. movlw h’32’ ;
29. movwf J ;
30. jloop: movwf K ;
31. kloop: decfsz K,f ;
32. goto kloop
33. decfsz J,f ;
34. goto jloop
35. movlw 02h ;
36. ;Possibly change LED direction
37. xorwf PORTA,0;
38. goto mloop ;
39. end ;
tak to pozmieniałem czy jest ktos to wstanie posprawdzać
File CHASER.ASM
; Blinks LEDs on outputs (Port B) in a rotating pattern.
; Reverses direction if port A, Bit 0, is high.
processor 16f84
include <p16f84.inc>
__config _RC_OSC & _WDT_OFF & _PWRTE_ON
; Give names to 2 memory locations (registers)
J equ H’1F’ ; J = address hex 1F
K equ H’1E’ ; K = address hex 1E
; Program
org 0 ; start at address 0
; Set Port B to output and initialize it.
movlw B’00000000’ ; put binary ’00000000’ in the working register
tris PORTB ; copy W to port B control register
movlw B’00000001’ ; put binary ’00000001’ in the working register
movwf PORTB ; copy the Wreg to PORTB
bcf STATUS,C ; clear the carry bit
; Main loop. Check Port A, Bit 0, and rotate either left or right through the carry register.
mloop:
btfss PORTA,0 ; ; skip next instruction if bit=1
goto m1
rlf PORTB,f ; rotate port B bits to left
goto m2
m1:
rrf PORTB,f ; rotate port B bits to right
m2:
; add a Delay
call Delay ; call subroutine to slow the LED
movlw 02h; copy the 02h into working register
;Possibly change LED direction
xorwf PORTA,0; Toggle the LED
goto mloop ;
;Here is Subroutine
Delay
movlw h’32’ ; w := 32 hex
movwf J ; J := w
jloop: movwf K ; K := w
kloop: decfsz K,f ; K := K-1, skip next if zero
goto kloop ; repeat kloop if delay is not zero
decfsz J,f ; J := J-1, decrement register skip next if zero
goto jloop ; repeat jloop if delay is not zero
Return ;When finished return to main, return from call, location of nex
end ; program ends here
A subroutine is a section of code, or program, than can be called as and when you need it. Subroutines are used if we are performing the same function more than once, for example creating a delay. The advantages of using a subroutine are that it will be easier to alter the value once inside a subroutine rather than, say, ten times throughout your program, and also it helps to reduce the amount of memory in our program occupies inside the PIC.
The advantages of breaking a program into subroutines :
• Decomposing a complex programming task into simpler steps: this is one of the two main tools of structured programming, along with data structures
• Reducing duplicate code within a program
• Enabling reuse of code across multiple programs
• Dividing a large programming task among various programmers, or various stages of a project
• Hiding implementation details from users of the subroutine
Linkia
Rewrite the delay section of the program again using a built-in Timer0 function with annotations. Also explain with aid of a diagram how the timer function counts the delay and the advantage a function might have over keeping the delay section in the main program
; File CHASER.ASM
; Blinks LEDs on outputs (Port B) in a rotating pattern.
; Reverses direction if port A, Bit 0, is high.
Clock : XTAL 4 MHz
processor 16f84
include <p16f84.inc>
__config _RC_OSC & _WDT_OFF & _PWRTE_ON
; Program
org 0 ; start at address 0
; Set Port B to output and initialize it.
Movlw ;configure Timer0 with
movlw B’00000000’ ; put binary ’00000000’ in the working register
tris PORTB ; copy W to port B control register
movlw B’00000001’ ; put binary ’00000001’ in the working register
movwf PORTB ; copy the Wreg to PORTB
bcf STATUS,C ; clear the carry bit
; Main loop. Check Port A, Bit 0, and rotate either left or right through the carry register.
mloop:
btfss PORTA,0 ; ; skip next instruction if bit=1
goto m1
rlf PORTB,f ; rotate port B bits to left
goto m2
m1:
rrf PORTB,f ; rotate port B bits to right
m2:
BTFSS INTCOM ,T0IF ; wait here until Timer0 count rolls over
GOTO MainLoop ; loop for ??????
BCF INTCON, T0IF ; bit (flag)must be cleared in software
movlw 02h; copy the02h into working register
;Possibly change LED direction
xorwf PORTA,0; Toggle the LED
goto mloop ;
end ; program ends here
prosze o pomoc
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