Question

我正在尝试用8051机器语言创建一个程序，它允许我以16字节块的形式将数据从ROM发送到PC，以便它可以同时执行其他工作。在这段代码中，我期待屏幕上显示以下输出：

Central station Debug Mode
Testing 115200bps speed mode with 16 byte chunks
12345678901234567890123456789012345678901234567890123456789012345678901234567890
80x25 screen?
uC to Linux screen test
Working? Yes? Maybe? No?
Test 100% wireless. 115200bps speed
TEST IS NOW FINISHED!
TX TEST OVER WAITING FOR RECEPTION!

然而，我得到的远不止于此。我实际收到的输出（根据Linux中的screen命令）如下：

OITPECER ROF
!H

我查看该文本，它让我认为它处理了最后16个字节，同时跳过了其余的开头字节。

我得到的微控制器和我正在测试的PC都在原始模式下设置为115200 bps，具有8个数据位，没有奇偶校验和1个停止位，并且在测试期间两个设备的电源保持连接所以我不能责怪缺乏权力。

我可以对此代码做些什么来改进它，以便所有文本都可以正确输出？

    TXBUFS equ 30h
RXBUFS equ 40h
TXOP bit 7Dh
RXOP bit 7Ch

org 0h
ljmp main

org 23h ;serial INT
  push PSW
  setb RS0 ;all serial functions use bank 1.
  jbc RI,rxdf
  jbc TI,txdf
  exitint:
  clr RS0
  pop PSW
reti


main:
mov SP,#52h
lcall serialinit
ljmp startdebug

;Serial port receive function
;Receiver controls R1 value unless we want to reset local buffer
rxdf:
  cjne R1,#RXBUFS+17,noerx
    clr RXOP
    ajmp exitint
  noerx:
  mov @R1,SBUF
  inc R1
ajmp exitint

;Serial port transmit function
txdf:
  cjne R0,#TXBUFS+17,noetx
    clr TXOP
    ajmp exitint
  noetx:
  mov SBUF,@R0
  inc R0
ajmp exitint

;enable receive
startrx:
  setb RS0
  mov R1,#RXBUFS
  setb RXOP
  clr RS0
ret

;Reset receiver stack
resetget:
  setb RS0
  mov R0,#RXBUFS+17
  clr RS0
ret

;Get byte as A from receiver stack.
getrx:
  setb RS0
  dec R0
  mov A,@R0
  clr RS0
ret

;Reset our stack pointer (to zero bytes on transmitter stack)
resetadd:
  setb RS0
  mov R0,#TXBUFS+17
  clr RS0
ret

;Add byte from A onto our transmitter stack. C=1 if end of stack reached
addtx:
  setb RS0
  dec R0
  mov @R0,A
  cjne R0,#TXBUFS,notxendp
    setb C
    inc R0
    clr RS0
  ret
  notxendp:
  clr C
  clr RS0
ret

;send data
starttx:
  setb TXOP ;set transmit busy flag
  setb RS0
  mov SBUF,@R0 ;send 1st byte right away to trigger interrupt later
  inc R0
  clr RS0
ret

;serial init
serialinit:
  mov TH1,#0FFh ;speed=115kbps
  mov TL1,TH1
  mov PCON,#80h
  mov SCON,#50h
  mov TMOD,#22h ;auto reload for timers
  setb RS0
  mov R0,#TXBUFS+17  ;setup our pointers.
  mov R1,#RXBUFS
  clr RS0
  setb TR1
  setb ES
  setb EA ;enable interrupts
ret

startdebug:
  mov DPTR,#mmenu ;load text
  lcall dprint ;and print it (not working correctly)
sjmp $

;print what's in ROM
dprint:
    lcall resetadd ;reset transmitter pointer
dprint2:
clr A
movc A,@A+DPTR
inc DPTR
jz dexitp ;exit function if character from local ROM is 0h
  lcall addtx ;send byte to transmitter
  jnc nostall
    ;at this point, we made buffer full so do 16-byte transmission
    lcall starttx
    ;and stall until all 16 bytes are transmitted
    txst:
      nop
    jb TXOP,txst
    ;reset transmitter pointer again for next 16 bytes
    lcall resetadd
  nostall:
  sjmp dprint2
dexitp:
  ;do one more round of transmission for remaining characters in transmit buffer
  lcall starttx
  ;and stall again
  txst2:
    nop
  jb TXOP,txst2
  ;and reset
  lcall resetadd
ret

mmenu:
db 'Central station Debug Mode',0Dh,0Ah,0Dh,0Ah
db 'Testing 115200bps speed mode with 16 byte chunks',0Dh,0Ah
db '12345678901234567890123456789012345678901234567890123456789012345678901234567890',0Dh,0Ah
db '80x25 screen?',0Dh,0Ah
db 'uC to Linux screen test',0Dh,0Ah
db 'Working? Yes? Maybe? No?',0Dh,0Ah
db 'Test 100% wireless. 115200bps speed',0Dh,0Ah,0Dh,0Ah
db 'TEST IS NOW FINISHED!',0Dh,0Ah
db 'TX TEST OVER WAITING FOR RECEPTION!',0Dh,0Ah,00h

8051 micro的串口输出不完整且反转

0 个答案: