问题描述
我需要把它变成一个列表理解。我被困了一段时间。有什么想法吗？
LIST p=16f1829 ;list directive to define processor
#INCLUDE <p16f1829.inc> ;processor specific variable deFinitions
__CONfig _CONfig1,(_FOSC_INTOSC & _WDTE_OFF & _PWRTE_OFF & _MCLRE_OFF & _CP_OFF & _CPD_OFF & _BOREN_ON & _CLKOUTEN_OFF & _IESO_OFF & _FcmeN_OFF);
__CONfig _CONfig2,(_WRT_OFF & _PLLEN_OFF & _STVREN_OFF & _LVP_OFF);
;-------------------------------------------------------------------------
; UDATA_SHR declares a section of shared (all across the banks) uninitialised data
INT_VAR UDATA_SHR ; INT_VAR is the section name in ACCESS RAM
TempC RES 1 ;
L0 RES 1 ;
w_temp RES 1 ; variable used for context saving
pclath_temp RES 1 ; variable used for context saving
status_temp RES 1 ; variable used for context saving
;-------------------------------------------------------------------------
LEDtrisA EQU TRISA
LEDtrisC EQU TRISC
LEDlatA EQU LATA
LEDlatC EQU LATC
;-------------------------------------------------------------------------
RESET_VECTOR CODE 0x0000
GOTO START ; When using debug header,ICD2 may not stop
; on instruction 0 during reset.
;-------------------------------------------------------------------------
INT_VECTOR CODE 0x0004 ; Interrupt vector location
ISR ; Relocatable Interrupt Service Routine
; Context saving for ISR
MOVWF w_temp ; save off current W register contents
MOVF STATUS,w ; move status register into W register
MOVWF status_temp ; save off contents of STATUS register
MOVF PCLATH,w ; Saves value in register PCLATH
MOVWF pclath_temp
;-------------------------------------------------------------------------
; If the interrupt came from the timer,execute the TMR0 interrupt
; service routine.
BANKSEL TMR0
MOVLW .96
MOVWF TMR0
BTFSC INTCON,TMR0IF
CALL Service_TMR0
BRA Updatedisplay ; Refresh the display
Updatedisplay
BANKSEL LATA ; Selects memory bank containing LATA register
MOVF LEDlatA,w ; display status -> w register
ANDLW 0x0f ; Separate the lower half byte
MOVWF TempC ; Save display status in TempC
BSF TempC,4 ; Beginning status of LSD display
RRF TempC,F ; Set the status of the next display
BTFSS STATUS,C ; C = 1?
BCF TempC,3 ; If not,turn off the LSD display
BTFSC TempC,0
BRA UpdateMsd ; If it is turned on,display the MSD
; digit of the number
UpdateLsd
BCF TempC,3
BSF TempC,1
BTFSS STATUS,Z ; If it is,skip
MOVF L0,w ; Third LSD digit -> w
ANDLW 0x0f ; /
BRA displayOut ; Show it on the display
UpdateMsd
SWAPF L0,w ; MSD figure - >
ANDLW 0x0f ; /
BTFSC STATUS,Z ; MSD = 0?
MOVLW 0x0a ; If it is,skip
displayOut
CALL LedTable ; Take the mask for a digit
MOVWF LEDlatC ; Set the mask on port B
MOVF TempC,W ; Turn on displays
MOVWF LEDlatA
BRA ISR_END
LedTable
ADDWF PCL,F
RETLW B'00111111' ; mask for digit 0
RETLW B'00000110' ; mask for digit 1
RETLW B'01011011' ; mask for digit 2
RETLW B'01001111' ; mask for digit 3
RETLW B'01100110' ; mask for digit 4
RETLW B'01101101' ; mask for digit 5
RETLW B'01111101' ; mask for digit 6
RETLW B'00000111' ; mask for digit 7
RETLW B'01111111' ; mask for digit 8
RETLW B'01101111' ; mask for digit 9
RETLW B'00000000' ; no digit ......
;-------------------------------------------------------------------------
ISR_END
; Restore contents before returning from interrupt
MOVF pclath_temp,w ; PCLATH is given its original content
MOVWF PCLATH
MOVF status_temp,w ; STATUS is given its original content
MOVWF STATUS
SWAPF w_temp,f ; W is given its original content
SWAPF w_temp,w
BSF INTCON,GIE ; Global interrupt enabled
RETFIE ; Return from interrupt routine
;-------------------------------------------------------------------------
MAIN_PROG CODE
START
;-------------------------------------------------------------------------
ERRORLEVEL -302 ; disable warning accessing register not in bank 0
BANKSEL OSCTUNE ; Configure OPTION_REG and TMR0
MOVLW 0x00 ; Set oscillator to factory calibrated frequency
MOVWF OSCTUNE ;
BANKSEL STATUS
ERRORLEVEL +302 ; Enable warning accessing register not in bank 0
CLEAR_RAM ; code sequence initialises all GPR's to 0x00
MOVLW 0x70 ; initialise pointer
MOVWF FSR0 ; to RAM
CLRF FSR0H
NEXT
CLRF INDF0 ; Clear INDF0 register
INCF FSR0L,F ; Inc pointer
BTFSS FSR0L,7 ; All done?
GOTO NEXT ; No,clear NEXT
CONTINUE ; Yes,CONTINUE
nop
;-------------------------------------------------------------------------
; MAIN BODY OF PROGRAM
;-------------------------------------------------------------------------
; Setup main init
BANKSEL OSCCON ; Selects memory bank containing OSCCON register
MOVLW b'01011000' ; Set cpu clock speed of 500KHz -> correlates to (1/(500K/4)) for each instruction
MOVWF OSCCON ; OSCCON <- 0x38
; Setup pins as digital I/O
BANKSEL ANSELA ; Selects memory bank containing ANSELA register
CLRF ANSELA ; All pins are digital
CLRF ANSELC
; Configure the input & output pins
BANKSEL TRISA ; Selects memory bank containing TRISA register
MOVLW b'11111100' ; RA0 and RA1 are configured as outputs and
; used for 7-segment display multiplexing
; RA2 is input push-button for initialization
MOVWF TRISA
CLRF LEDtrisC ; Port C is output
BANKSEL LATA ; Selects memory bank containing LATA register
CLRF LEDlatA ; Set all outputs to "0"
CLRF LEDlatC ;
BSF LEDlatA,1 ; Turn on MSD display
; Setup Timer0 as the delay
BANKSEL OPTION_REG
MOVLW b'10000100' ; TMR0 is incremented each 32us (Fclk=8MHz)
MOVWF OPTION_REG ; ps = 32
BANKSEL TMR0 ; Selects memory bank containing TMR0 register
BSF INTCON,GIE ; Global interrupt enabled
BSF INTCON,TMR0IE ; Timer TMR0 interrupt enabled
MOVLW 0x79
MOVWF L0
MAINLOOP
BRA MAINLOOP ; Continue forever
; TIMER 0 Interrupt routine clears the TMR0 interrupt flag.
Service_TMR0:
BANKSEL INTCON
BCF INTCON,TMR0IF ; MUST ALWAYS clear this in software or else stuck in the ISR forever
RETURN
;-------------------------------------------------------------------------
; END OF PROGRAM
;-------------------------------------------------------------------------
END ; End of program
解决方法
你可以这样做 -
[number*i for i in range(length+1)][1:]
这将迭代 range(length+1) 将每个乘以数字并存储在列表中。然后我只取除第 0 个元素之外的所有元素。
您可以从 1 开始迭代以避免首先生成第 0 个元素，正如@wwii 所建议的
[number*i for i in range(1,length+1)] #or simply range(length)