mastuart.lst

aduc842原程序代码 ad公司芯片应用笔记

MASTUART                                                                                                      PAGE 1

                       1    ;====================================================================
                       2    ;
                       3    ; Author        : ADI - Apps
                       4    ;
                       5    ; Date          : October 2003
                       6    ;
                       7    ; File          : MASTuart.asm
                       8    ;
                       9    ; Hardware      ; ADuC842/ADuC843
                      10    ;
                      11    ; Description   : This Program transmits the numbers 1-10 in binary 
                      12    ;                 form continuously down the SPI serial port. 
                      13    ;                 After the transmission of each byte the incoming 
                      14    ;                 byte is saved in order between internal RAM 
                      15    ;                 addresses 40h and 50h.
                      16    ;
                      17    ;                 After the 16 bytes have been writen into memory 
                      18    ;                 the program outputs the received data up the UART 
                      19    ;                 where it can be viewed using Hyperterminal. 
                      20    ;                 
                      21    ;                 An SPI slave program can be run on a second ADuC832 
                      22    ;                 to communicate with this master code.
                      23    ;                 The Slave program (SLAVuart.asm in the SPI\SLAVE
                      24    ;                 directory) should be started after the master 
                      25    ;                 program (MASTuart.asm) but within the time delay 
                      26    ;                 of 5s in order that the slave program is 
                      27    ;                 synchronised by the first outputted clock of the 
                      28    ;                 master.
                      29    ;
                      30    ;                 The clock is outputted at sclock (pin 26)
                      31    ;                 The data is outputted at sdata/MOSI (pin 27)  
                      32    ;                 The data is inputted at MISO (pin 14)
                      33    ;====================================================================
                      34    ;       
                      35    $MOD842                                  ;Use 8052 predefined Symbols
                      36    
  00B4                37    LED     EQU     P3.4
  0000                38    FLAG    BIT     00H
                      39    
                      40    ;____________________________________________________________________
                      41                                                      ; BEGINNING OF CODE
----                  42    CSEG
0000                  43    ORG 0000H
                      44    
0000 020060           45            JMP MAIN
                      46    ;____________________________________________________________________
                      47                                                  ; SPI INTERRUPT ROUTINE
003B                  48    ORG 003BH
003B D2B5             49            SETB    P3.5          ; set the SS bit after transmission
003D C200             50            CLR     FLAG          ; Clear flag to leave loop
                      51    
003F A7F7             52            MOV     @R1, SPIDAT   ; move input into memory
0041 09               53            INC     R1            ; increment memory location so new 
                      54                                  ; data is stored in new address
                      55            
0042 B95003           56            CJNE    R1, #50H, CONT ; reset memory location to 40h when 
                      57                                   ; memory location reaches 50h saving
                      58                                   ; 16 bytes of data
MASTUART                                                                                                      PAGE 2

                      59            
0045 12008C           60            CALL    SNDUART         ; send the data up the UART
0048 32               61    CONT:   RETI
                      62    
                      63    ;____________________________________________________________________
                      64                                                           ; MAIN PROGRAM
                      65    
0060                  66    ORG 0060H                    ; Start code at address above interrupts                   
                      67    
0060                  68    MAIN:                          ; Main program
                      69    
0060 759E83           70            MOV     T3CON,#083h
0063 759D2D           71            MOV     T3FD,#02Dh
0066 759852           72            MOV     SCON,#052h
                      73    
0069 75F837           74            MOV     SPICON,#037h   ; Initialise SPICON to have
                      75                                   ; -bitrate=fosc/64
                      76                                   ; -CPHA=1
                      77                                   ; -CPOL=0, sclk idling low
                      78                                   ; -master mode select
                      79                                   ; -Enable SPI serial port
                      80              
006C 75A901           81            MOV     IEIP2, #01h    ; Enable SPI interrrupt
006F D2AF             82            SETB    EA             ; Enable interrupts
                      83    
0071 7940             84            MOV     R1, #40h       ; initialise R1 to 40 to store the 
                      85                                   ; input data from memory location 40
0073 7800             86            MOV     R0, #00H       ; initialise R0 to 0 to start 
                      87                                   ; transmissions from 1
                      88    
                      89    ; Delay the output of data by 2.0s in order that  the slave program
                      90    ; can be easily synchronised with the master program.
                      91    
0075 74C8             92            MOV      A, #200      
0077 1200F8           93            CALL     DELAY
                      94    
007A                  95    TRNSMT: 
007A 08               96            INC     R0
007B C2B5             97            CLR     P3.5           ; clear the SS bit during transmission           
007D 88F7             98            MOV     SPIDAT, R0     ; transmit the current value on R0
007F D200             99            SETB    FLAG           ; set flag so that we wait here until
                     100                                   ; the spi interrupt routine clears
                     101                                   ; the FLAG
                     102    
0081 2000FD          103            JB      FLAG, $        ; stay here until flag is  cleared
                     104                                   ; by interrupt
                     105            
                     106    ; check if R0 is equal to 10. If so the number 10 has been 
                     107    ; transmitted and we should reset R0 to 0 to start transmission 
                     108    ; from 1 again
                     109    
0084 E8              110            MOV     A, R0 
0085 B40AF2          111            CJNE    A, #0AH, TRNSMT ; if R0 is not 10, jump to TRNSMT 
0088 7800            112            MOV     R0, #00H        ; if R0=10 make R0=0 & jump to TRNSMT 
008A 80EE            113            JMP     TRNSMT
                     114            
                     115    ; Transmit the values in locations 40h->50h up the UART wait for 
                     116    ; 5 seconds and then transmit and receive values to/from the slave
MASTUART                                                                                                      PAGE 3

                     117    ; again down the SPI port.      
                     118    
008C                 119    SNDUART:
008C B2B4            120            CPL      LED          ;CPL LED with each transmission
008E 900104          121            MOV      DPTR, #TITLE 
0091 1200B8          122            CALL     SENDSTRING   ; write title block on screen
                     123    
0094 7940            124            MOV      R1, #40h     ; move value at address 40 into R2
0096 E7              125            MOV      A, @R1     
0097 FA              126            MOV      R2, A                           
                     127    
0098                 128    NEXT:                        ; Put new value on a new line
0098 740A            129            MOV      A, #10      ; Transmit a linefeed (= ASCII 10)
009A 1200D0          130            CALL     SENDCHAR
009D 740D            131            MOV      A, #13      ;Transmit a carriage return (=ASCII 13)
009F 1200D0          132            CALL     SENDCHAR
                     133    
00A2 EA              134            MOV      A, R2       ; Transmit R2 i.e. value @ address R1
00A3 1200D8          135            CALL     SENDVAL
00A6 09              136            INC      R1          ; Increment address
00A7 E7              137            MOV      A, @R1
00A8 FA              138            MOV      R2, A       ; R2 holds the value @ addrR1
                     139    
00A9 E9              140            MOV      A, R1           ; Check if at address 50h
00AA B450EB          141            CJNE     A, #50h, NEXT   ; if not jump to Next 
00AD 0200B0          142            JMP      WAIT2S          ; if so wait 2s and repeat
                     143    
00B0 74C8            144    WAIT2S: MOV      A, #200      ; wait 2s before sending down the 
                     145                                  ; SPI port again for ease of viewing
                     146                                  ; on screen and to allow the slave
                     147                                  ; synchronise itself with the master
00B2 1200F8          148            CALL     DELAY
00B5 7940            149            MOV      R1, #40h     ; store new inputs at address 40h again 
00B7 32              150            RETI
                     151    
                     152    ;____________________________________________________________________
                     153                                                             ; SENDSTRING
                     154    
00B8                 155    SENDSTRING:     ; sends ASCII string to UART starting at location
                     156                    ; DPTR and ending with a null (0) value
                     157    
00B8 C0E0            158            PUSH    ACC