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Board index » 產品技術問題 (開版時請註明使用的元件編號及C編譯器版本) » » 8-bit PIC® MCU » RS232的棘手問題~~


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hahaha
Re: RS232的棘手問題~~
#3
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太感謝你了~~真的解決了~~ ^^"
不知能否為我解釋一下，想要多學點

發表於: 2006/4/21 11:24
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Ryang
Re: RS232的棘手問題~~
#2
版主
版主


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在judge裡刪掉 CREN & SPEN 清零的動作後再試試看:
judge:
        clrf    PORTD
        clrf    TRISD
        clrf    LATD
;        bcf        RCSTA,CREN,0  
;        bcf        RCSTA,SPEN,0
        movff    RCREG,number
        btfss    number,1        
        goto    turn    
        goto    act    
        return

發表於: 2006/4/20 16:22
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hahaha
RS232的棘手問題~~
#1
新會員
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小妹我使用RS232傳輸訊號給PIC實驗板，運用VB寫一個測試程式用按鈕傳值給板子，把RS232的特殊暫存器RCREG所接收到的資料陣列直接傳給PORTD，發現一個問題，訊號的確是有送入PORTD，但是往往測試到第31次，PORTD就會停住而不在改變，用示波器量測的結果是資料有一直在更新，可是實驗板就是停住，都要按一下實驗板上的RESET鍵，才可以重新來，不知道為什麼會這樣，以下我列出我的程式碼，希望版主可以為我解個答，謝謝~~

====================================
程式碼
====================================
#include <p18f452.inc>
Baud_Rate    equ        d'103'
W_Temp        set     0x20
STATUS_Temp    set     0x21
BSR_Temp               set     0x22
number        set        0x23
        org        0x00
        nop
        goto    Main_Program
        org        0x08
        goto    INT_SER
        retfie
        org        0x18
        retfie
    
Main_Program:
        clrf    PORTD
        clrf    TRISD
        clrf    LATD

BB        call    RS232_Initial
        call    Open_Interrupt
ss        goto    ss
 
INT_SER:
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        movwf    W_Temp,0            ; Save W
        movff   STATUS,STATUS_Temp    ; Save STATUS
        movff    BSR,BSR_Temp                      ; Save BSR
        btfss    PIR1,RCIF,0
        goto    INT_SER
        call    judge
        call    INT_SER_End
        goto    BB
        retfie

INT_SER_End:
       
        movff   STATUS_Temp,STATUS    
                                ; Load STATUS
        movff    BSR_Temp,BSR                        ; Load BSR
        movf    W_Temp,W,0            ; Load W
        return
 
Open_Interrupt:        
        bsf        RCON,IPEN,0
        bsf        INTCON,PEIE,0    
        bsf        INTCON,GIE,0
        return    

RS232_Initial:
        clrf    TMR0L
        clrf    TMR0H
        bsf     TRISC,6,0
        bcf        TRISC,6,0
        bcf        TRISC,7,0
        bsf        TRISC,7,0
        movlw    Baud_Rate
        movwf    SPBRG,0
        bsf        TXSTA,BRGH,0
        bcf     TXSTA,SYNC,0  ;高速 非同步 8bit    
        bsf        RCSTA,CREN,0
        bsf        RCSTA,SPEN,0
        bsf        IPR1,RCIP,0
        bsf        PIE1,RCIE,0
        return

judge:
        clrf    PORTD
        clrf    TRISD
        clrf    LATD
        bcf        RCSTA,CREN,0  
        bcf        RCSTA,SPEN,0
        movff    RCREG,number
        btfss    number,1        
        goto    turn    
        goto    act    
        return

turn
        btfss    number,0    
                           ;判斷最後一bit為1時則為right
         goto    left            
                                 ;left為            0x42
    goto    right    
                       ;right為0x43    
        
act
        btfss    number,0
        goto    forward
        goto    stop
left
        movff    RCREG,LATD
        
        retfie

right
        movff    RCREG,LATD
        
        retfie


forward
        movff    RCREG,LATD
             
        retfie

stop
        movff    RCREG,LATD
        
        retfie
        end



發表於: 2006/4/20 15:00
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Board index » 產品技術問題 (開版時請註明使用的元件編號及C編譯器版本) » » 8-bit PIC® MCU » RS232的棘手問題~~


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