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04/05/11 07:03
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#181691 - Intel 8051 RS-232 Interface and fingerprint module !!
Hello there

I want your help about this program. I have a device that I must sent one packet which consists of 25 bytes via serial interface (rs-232) using 8051 micro-controller and after the package received form the device it responds with another packet (25 bytes).

For example I must sent something like this:
7E 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 (25 bytes)

and after that I must receive something like this:
7E 00 00 00 01 00 00 00 01 00 00 00 0A 00 00 00 00 00 00 00 00 00 00 00 0C

I wrote this program and now I want to see the packet that the device sent to host (8051). But I can't see it complete, I only receive the first and the last byte, this is the program, is it anything wrong ?

Thank you in advance :)

ORG 000H

;===================================baudrate==========================================

MOV      SCON,#50H           ; receive enable, 8-BIT, 1 STOP BIT.
MOV      TMOD,#20H           ; timer 1 in 8-bit auto reload.
MOV      TH1,#0FDH           ; baud rate 9600.
SETB     TR1                 ; Start Timer 1
ANL      PCON, #01111111B    ; SMOD = 0
;======================================================================================

MOV      R0,#25
MOV      DPTR,#TABLE

NEXT:
MOV      A,#0
MOVC     A,@A+DPTR
CLR      TI                  ;Clear TI.
MOV      SBUF,A              ;Send the content of ACC to Serial port
JNB      TI,$                ;Pause until the TI bit is set.
INC      DPTR
DJNZ     R0,NEXT

MOV      R2,#25

NEXT1:
JNB      RI,$                ;Wait for 8051 to set the RI flag.
MOV      A,SBUF              ;Read the character from the serial port.
MOV      P2,A                ;Echo the content of ACC to P2
CALL     DELAY
CLR      RI                  ;Set the RI=0 for getting the next byte
DJNZ     R2,NEXT1

;==============================
; DELAY 0.5S
;==============================
DELAY:
MOV     R5,#5
DL2:
MOV     R6,#200
DL1:
MOV     R7,#249
DJNZ    R7,$
DJNZ    R6,DL1
DJNZ    R5,DL2
RET

;==============================
TABLE:  DB 7EH,00H,00H,00H,33H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,1AH,00H,00H,00H,00H,00H,00H,00H,4EH
END 



List of 77 messages in thread
TopicAuthorDate
Intel 8051 RS-232 Interface and fingerprint module !!            01/01/70 00:00      
   I want to see the packet            01/01/70 00:00      
   Comments            01/01/70 00:00      
      MTS-51 8051 Microcomputer Trainer            01/01/70 00:00      
         A what?            01/01/70 00:00      
            please help !!            01/01/70 00:00      
               Never wait until "it works"            01/01/70 00:00      
                  I do it            01/01/70 00:00      
                     RE: "must work to continue writing code"            01/01/70 00:00      
                     you got a very positive reply            01/01/70 00:00      
               You need to provide the information!            01/01/70 00:00      
               P2            01/01/70 00:00      
   that old?            01/01/70 00:00      
      No - not that old!            01/01/70 00:00      
         80C51RD+            01/01/70 00:00      
            But what about those displays??            01/01/70 00:00      
               7-Segment LED displays            01/01/70 00:00      
                  That raises further questions            01/01/70 00:00      
                     BCD to 7-segment decoder            01/01/70 00:00      
                        But still no answer - repeated identical values?            01/01/70 00:00      
                           DELAY            01/01/70 00:00      
                              And you're surprised that you miss characters?!            01/01/70 00:00      
                                 Yes you are right but            01/01/70 00:00      
                                    Think about it            01/01/70 00:00      
                                       too busy to think ?            01/01/70 00:00      
                                          Coding is the LAST thing you should do!            01/01/70 00:00      
   Interesting article about fingerprint recognition            01/01/70 00:00      
      Thank you very much            01/01/70 00:00      
         Nothing to do with nitgen            01/01/70 00:00      
            yes I have read...            01/01/70 00:00      
               Again,            01/01/70 00:00      
                  ok, I am listenig to you..            01/01/70 00:00      
                     Serial Comms            01/01/70 00:00      
                        Σας ευχαριστώ κύριε Αγγελή για την            01/01/70 00:00      
                           BEFORE you start coding...            01/01/70 00:00      
                           Thinking before coding            01/01/70 00:00      
   Thank you very much..            01/01/70 00:00      
      Standard byte-by-byte loop            01/01/70 00:00      
         is this ok ?            01/01/70 00:00      
            Table bytes comparison            01/01/70 00:00      
               Does 8051 has two DPTR ??            01/01/70 00:00      
                  Same DPTR if you don't have two            01/01/70 00:00      
                  Please crarify settings of board/device            01/01/70 00:00      
                     for the moment...            01/01/70 00:00      
                  WHY ON EARTH            01/01/70 00:00      
                     Yes I know what they are...            01/01/70 00:00      
                        Why even keep the received data in an array?            01/01/70 00:00      
                           Please read....            01/01/70 00:00      
                              I have - have you?            01/01/70 00:00      
                                 Yes please            01/01/70 00:00      
                                    you can't store in code memory            01/01/70 00:00      
   Is this code ok ??            01/01/70 00:00      
      Wrong focus for comments - and untested code            01/01/70 00:00      
         I have tested !!            01/01/70 00:00      
            do you have that much external RAM?            01/01/70 00:00      
            No. You think you have tested but not multiple turns            01/01/70 00:00      
            Experimenting with 8051 embedded            01/01/70 00:00      
               thank you...            01/01/70 00:00      
                  Here we are again....            01/01/70 00:00      
                     take a look !!            01/01/70 00:00      
                        Baudrate            01/01/70 00:00      
                           thanks            01/01/70 00:00      
                           yes, but better            01/01/70 00:00      
                              Question            01/01/70 00:00      
                                 difference between ORG 000H and ORG 113H            01/01/70 00:00      
                                    usually.....            01/01/70 00:00      
                                       Now do you understand...            01/01/70 00:00      
                                 ORG is not an instruction, it is ...            01/01/70 00:00      
                                    PLEASE SEE THIS AND HELP !!            01/01/70 00:00      
                                       Copied "END" without first reading what it meant?            01/01/70 00:00      
                                       step-by-step mode            01/01/70 00:00      
                                          thank you            01/01/70 00:00      
                                             Assembler way is difficult            01/01/70 00:00      
                                                Thank you.....            01/01/70 00:00      
                                                   Step through the examples            01/01/70 00:00      
                                                      Of course            01/01/70 00:00      
                                                         THANK YOU ALL            01/01/70 00:00      

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