tx11to20.lst

aduc842原程序代码 ad公司芯片应用笔记

TX11TO20                                                                                                      PAGE 1

                       1    ;====================================================================
                       2    ;
                       3    ; Author        : ADI - Apps
                       4    ;
                       5    ; Date          : October 2003
                       6    ;
                       7    ; File          : tx11to20.asm
                       8    ;
                       9    ; Hardware      : ADuC842/ADuC843
                      10    ;
                      11    ; Description   : This slave program transmits the numbers 11-20 in 
                      12    ;                 binary form continuously down the spi port after
                      13    ;                 receiving a clock signal. 
                      14    ;
                      15    ;                 After the transmission of each byte the incoming 
                      16    ;                 byte is saved in order at a internal RAM address 
                      17    ;                 between #40h and #50h
                      18    ;
                      19    ;                 This program can be used with the master program 
                      20    ;                 spimast.asm (which generates a clock signal for 
                      21    ;                 the slave) 
                      22    
                      23    ;                 The Slave program tx11to20 should be started 
                      24    ;                 after the master program (842mstr.asm) but within
                      25    ;                 the time delay of 5s in order that the slave 
                      26    ;                 program is synchronised by the first outputted 
                      27    ;                 clock of the master.
                      28    ;
                      29    ;                 The clock is inputted at sclock (pin 26)
                      30    ;                 The data is outputted at MISO (pin 14)
                      31    ;                 The data is inputted at sdata/MOSI (pin 27)   
                      32    ;
                      33    ;====================================================================
                      34    ;       
                      35    $MOD842                                  ;Use 8052 predefined Symbols
                      36    
  00B4                37    LED     EQU     P3.4
  0000                38    FLAG    BIT     00H
                      39    
                      40    
                      41    ;____________________________________________________________________
                      42                                                      ; BEGINNING OF CODE
----                  43    CSEG
0000                  44    ORG 0000H
                      45    
0000 020060           46            JMP MAIN
                      47    ;____________________________________________________________________
                      48                                                  ; SPI INTERRUPT ROUTINE
003B                  49    ORG 003BH
003B C200             50            CLR     FLAG          ; Clear flag to leave loop
                      51    
003D A7F7             52            MOV     @R1, SPIDAT   ; move input into memory
003F 09               53            INC     R1            ; increment memory location so new 
                      54                                  ; data is stored in new address
                      55            
0040 B95002           56            CJNE    R1, #50H, CONT ; reset memory location to 40h when 
                      57                                   ; memory location reaches 50h saving
                      58                                   ; 16 bytes of data
TX11TO20                                                                                                      PAGE 2

0043 7940             59            MOV     R1, #40H
0045 32               60    CONT:   RETI
                      61    
                      62    
                      63    ;====================================================================
                      64    
0060                  65    ORG 0060H                    ; Start code at address above interrupts                   
                      66    
                      67    
                      68    
0060                  69    MAIN:                          ; Main program
                      70    
0060 75F824           71            MOV     SPICON,#24h    ; Initialise SPICON to have
                      72                                   ; -Enable SPI serial port
                      73                                   ; -slave mode select
                      74                                   ; -CPOL=0, clk idling low 
                      75                                   ; -CPHA=1
                      76    ; note: it is important to have CPHA in the master and the slave 
                      77    ;       program equal, otherwise uncertainty will exist, as the input
                      78    ;       will be measued during its change of state, and not is at
                      79    ;       its final value.
                      80                   
0063 75A901           81            MOV     IEIP2, #01h    ; Enable SPI interrupt
                      82      
0066 780A             83            MOV     R0, #0AH       ; initialise R0 to 10 to start
                      84                                   ; transmission from 11
0068 7940             85            MOV     R1, #40h       ; initialise R1 to 40 to store the 
                      86                                   ; input data from memory location 40
                      87            
006A D2AF             88            SETB    EA             ; Enable interrupts
                      89    
006C                  90    TRNSMT: 
006C 08               91            INC     R0
006D 88F7             92            MOV     SPIDAT, R0     ; transmit the current value on R0
006F D200             93            SETB    FLAG           ; set flag so that we wait here until
                      94                                   ; the spi interrupt routine clears
                      95                                   ; the FLAG
                      96    
0071 2000FD           97            JB      FLAG, $        ; stay here until flag is cleared
                      98                                   ; by interrupt
                      99             
                     100    ; check if R0 is equal to 20. If so the number 20 has been 
                     101    ; transmitted and we should reset R0 to 10 to start transmission 
                     102    ; from 11 again.
0074 E8              103            MOV     A, R0 
0075 B414F4          104            CJNE    A, #14H, TRNSMT ; if R0 is not 20, jump to TRNSMT 
0078 780A            105            MOV     R0, #0AH        ; if R0=20 make R0=10 & jump to TRNSMT 
007A 80F0            106            JMP     TRNSMT
                     107                    
                     108    END

VERSION 1.2h ASSEMBLY COMPLETE, 0 ERRORS FOUND
TX11TO20                                                                                                      PAGE 3

CONT . . . . . . . . . . . . . .  C ADDR  0045H  
EA . . . . . . . . . . . . . . .  B ADDR  00AFH  PREDEFINED  
FLAG . . . . . . . . . . . . . .  B ADDR  0000H  
IEIP2. . . . . . . . . . . . . .  D ADDR  00A9H  PREDEFINED  
LED. . . . . . . . . . . . . . .    NUMB  00B4H  NOT USED  
MAIN . . . . . . . . . . . . . .  C ADDR  0060H  
P3 . . . . . . . . . . . . . . .  D ADDR  00B0H  PREDEFINED  
SPICON . . . . . . . . . . . . .  D ADDR  00F8H  PREDEFINED  
SPIDAT . . . . . . . . . . . . .  D ADDR  00F7H  PREDEFINED  
TRNSMT . . . . . . . . . . . . .  C ADDR  006CH