我的任务是开发一个程序，它将 LED 从 D7 闪烁到 D0。
我开发了一种解决方案，它使它们闪烁一次，然后出现堆栈溢出。
我对查找表持怀疑态度，因为以前我在上次 TRISA 配置中遇到错误（现在评论）我正在粘贴代码。
;*********************************************************************************
; Filename: Pic_demonstration.asm -it should be!
; Author: Alexander Drabek
; Date: 01.05.13
; Description: This Assembler program for PIC16F684 turns ON and OFF LEDs from D7 to D0
; with a delay of 0.5 second
;Check if trisa reaching the 4th and PORTA eight leds.
;To report:
;1.separate PCL in Bank1 and Bank0
;2.Lookup table and undaestanding of options of the code.
;3.we are assuming to work in Bank0
;4.overflow.
list p=16F684 ; List directive to define processor
#include <p16f684.inc> ; Processor specific variable definitions
__CONFIG _CP_OFF & _WDT_OFF & _PWRTE_ON & _INTRC_OSC_NOCLKOUT & _MCLRE_OFF & _CPD_OFF
;****************************** Assignment Statements ****************************
;Delay counters
COUNT1 EQU 20h ; Store COUNT1 at address 20h
COUNT2 EQU 21h ; Store COUNT2 at address 21h
normal EQU 22h ; Store normal at address 22h - responsible for general loop(4 times change trisa)
COUNT3 EQU 26h ; another counter to make more delay
;Loops counters
PORTA_Internal EQU 23h ;Store PORTA_Internal at address 21h
COUNT_LED_NUMBER EQU 24h ; Store COUNT_LED_NUMBER at address 21h
COUNT_TRISA_NUMBER EQU 25h ; Store COUNT_TRISA_NUMBER at address 21h
;****************************** "Start" of Program ******************************
; Initial configuration
;errorlevel -302 ; Disable bank switch warning
org 0x000 ; Processor reset vector
bcf STATUS,RP0 ; Bank 0 selected
movlw 07h ; Set RA<2:0> to digital and
movwf CMCON0 ; Comparators turned OFF
bsf STATUS,RP0 ; Bank 1 selected
clrf ANSEL ; Digital I/O selected
movlw B'00111111' ; Move in W - 0x3F - Set all I/O pins as digital inputs
movwf TRISA ; Configure I/O ports
clrf INTCON ; Disable all interrupts, clear all flags
bcf STATUS,RP0 ; Bank 0 selected
clrf PORTA ; Clear all outputs
;*********************************************************************************
; Load values for counters .
AGAIN;reset the value
movlw B'11101010' ; First load a value of say, F0h in the W register
movwf COUNT2 ; Now move it to COUNT2 register
movlw 0x03; ; First load a value of say, F0h in the W register
movwf COUNT3 ; Now move it to COUNT2 register
movlw B'00000100' ; Load a value 4, in the W register
movwf normal ; Move it to normal
movlw B'00000010' ; First load a value of say, 1 in the W register
movwf PORTA_Internal ; Now move it to PORTA_Internal
movlw B'00000000' ; First load a value of say, 1 in the W register
movwf COUNT_LED_NUMBER ; Now move it to COUNT2 register
movlw B'00000000' ; First load a value of say, 1 in the W register
movwf COUNT_TRISA_NUMBER ; Now move it to COUNT2 register
goto start_loop
;********************************************************************************
;*********************************************************************************
Lookup_PORTA
movlw low TablePORTA
ADDWF COUNT_LED_NUMBER,0
movwf PCL ; Jump to specified entry
TablePORTA RETLW B'00000010' ; Sending HIGH to D7 -ok
RETLW B'00000100' ; Sending HIGH to D6 -ok
RETLW B'00000100' ; Sending HIGH to D5 -ok
RETLW B'00100000' ; Sending HIGH to D4 -ok
RETLW B'00000100' ; Sending HIGH to D3 -ok
RETLW B'00010000' ; Sending HIGH to D2 -ok
RETLW B'00100000' ; Sending HIGH to D1 -ok
RETLW B'00010000' ; Sending HIGH to D0 -OK--------
Lookup_TRISA
movlw low TableTRISA
ADDWF COUNT_TRISA_NUMBER,0
movwf PCL ; Jump to Specified entry ; RETLW B'00111001'; 57 - overflow!
TableTRISA RETLW B'00011011'; 27-DECIMAL ; Element 0 of lookup table
RETLW B'00101011'; 43-DECIMAL ; Element 1 of lookup table
RETLW B'00001111'; 15-DECIMAL ; Element 2 of lookup table
;it is always loading first one of eac lookup tables!
;*********************************************************************************
start_loop
;Temporary solution for overflow
bsf STATUS,RP0 ; Bank 1 selected
movlw B'00111001' ; TRISA for D6 and D7
movwf TRISA
bcf STATUS, RP0 ; Bank 0 selected
call DELAY
CALL Lookup_PORTA ; Call the table. -it should obtain the address for next memory cell with PORTA config
movwf PORTA ;light this diod!
call DELAY ; for a half second
clrf PORTA ; Clear PORTA
incfsz COUNT_LED_NUMBER,1 ;increase LED NUmber! save into variable!
call DELAY
CALL Lookup_PORTA ; Call the table. -it should obtain the address for next memory cell with PORTA config
movwf PORTA ;light this diod!
call DELAY ; for a half second
clrf PORTA ; Clear PORTA
incfsz COUNT_LED_NUMBER,1
;end of temporary solution
ITERNAL_TRISA_LOOP ;Change the trisa after 2 diods ,do it till end of lookup table
CALL Lookup_TRISA ; Call the table. -it should obtain the address for next memory cell with trisa config
bsf STATUS,RP0 ;Bank 1
movwf TRISA ;Move config to TRISA
bcf STATUS, RP0 ;Reset bank to 0
decfsz normal,1 ;Decrease the number of posible configuration in this iteration value of 5 -Not sure --it will omit las one (option 4)
goto INTERNAL_LOOP_2DIODS ; Blink 2 diods including delays
goto AGAIN ;
INTERNAL_LOOP_2DIODS ;develop the delay ! +TRISA CHANGE
bcf STATUS, RP0 ;
call DELAY
CALL Lookup_PORTA ; Call the table. -it should obtain the address for next memory cell with PORTA config
movwf PORTA ;light this diod!
call DELAY ; for a half second
clrf PORTA ; Clear PORTA
incfsz COUNT_LED_NUMBER,1 ;increase LED NUmber! save into variable!
decfsz PORTA_Internal,1 ; it should have value of 2 XD
goto INTERNAL_LOOP_2DIODS ; only 1 repeat!
incfsz COUNT_TRISA_NUMBER,1 ;increase the TRISA config number
movlw B'00000010' ; First load a value of say, 1 in the W register
movwf PORTA_Internal ; Now move it to COUNT2 register
goto ITERNAL_TRISA_LOOP ;- Loop forever -
goto AGAIN
;*********************************************************************************
; DELAY Subroutine
;*********************************************************************************
; Generate a delay period
DELAY
LOOP1 decfsz COUNT1,1 ; Decrement COUNT1 and skip next instruction if zero
goto LOOP1 ; else loop back to LOOP1
decfsz COUNT2,1 ; Decrement COUNT2 and skip next instruction if zero
goto LOOP1 ; else loop back to LOOP1
decfsz COUNT3,1 ; Decrement COUNT1 and skip next instruction if zero
goto LOOP1 ; else loop back to LOOP1
movlw 0x03 ; Reload the second counter for the next iteration
movwf COUNT3 ; Decrement COUNT3 and skip next instruction if zero
movlw 0xF0 ; Reload the second counter for the next iteration
movwf COUNT2
return ; else loop back to LOOP1
;*********************************************************************************
end
;*********************************************************************************
有谁知道可能出了什么问题？在调试每个计数器的值对我来说似乎没问题。
我试图寻求帮助，但我在汇编编程方面还很陌生。