昨天过节忙乎到半夜，今日终于出泥潭，搞定CH372的汇编版Ｕ

2万 · 2009-2-15 13:19

哈哈，前阵子画了板ＣＨ３７４的评估版，焊了块ＣＨ３７２做ＵＳＢ设备试验．
ＣＨ３７２在外置固件下枚举成Ｕ盘，Ｃ语言版本很早就搞定了．
网上遇一网友，说只会汇编，打赌说我无法搞出个汇编版的．
俺就不信这个邪，苦战半夜，终于搞定

源程序如下：

;古老牌U盘汇编版
;CH372+STC89C54单片机
;作者邮箱:xg_2004_sy@126.com

$INCLUDE                      (CH375INC.ASM)

STACK           EQU    80H             ;堆栈区栈顶(向上延伸)
;
; 需要主程序定义的参数
CH375_CMD_PORT        EQU    0xB100         ;CH375命令口的地址,地址译码后自动片选
CH375_DAT_PORT        EQU    0xB000         ;CH375命令口的地址,地址译码后自动片选
;

CH375_CON_ACT        BIT    P1.2

VAR_NeedTransBlockCount      Data     30h
VAR_TransCompleteBlockCount    Data    31H
VAR_MainRXDataPackCount        Data    32h
VAR_ucTransFinishPageCount    DATA    33H
VAR_ucNeedTransPageCount    DATA    34

VAR_ExtSRAMDataLocationPoint_L  Data    35H
VAR_ExtSRAMDataLocationPoint_H  Data    36H

VAR_CSW_BYTE_4            DATA    37H
VAR_CSW_BYTE_5            DATA    38H
VAR_CSW_BYTE_6            DATA    39H
VAR_CSW_BYTE_7            DATA    3AH

var_EP2_UP_STATUS        DATA    3BH        ;上传数据状态切换变量

CMD_BUFFER            DATA      3FH                ;命令包缓冲区,本程序约定命令包长度为CONST_CMD_LEN
CBW_Buffer            DATA     10H        ;cbW占用数据长度为12

VAR_SETUP_REQUEST    EQU   72H                            ;USB请求码
VAR_SETUP_LENGTH    EQU   73H                            ;后续数据长度
VAR_SETUP_DESCR        EQU   74H                            ;描述符偏移地址
VAR_SN_STRING        EQU   75H                            ;产品序列号字符串缓冲区,ANSI字符串
VAR_USB_ADDRESS        EQU   76H

Reload_Count         EQU     0F3H

c_Char_0         EQU   30H
c_Char_1         EQU   31H
c_Char_2         EQU   32H
c_Char_3         EQU   33H
c_Char_4         EQU   34H
c_Char_5         EQU   35H
c_Char_6         EQU   36H
c_Char_7         EQU   37H
c_Char_8         EQU   38H
c_Char_9         EQU   39H


; 定义位标志
CH375_CON_FLAG  BIT    2FH.0          ;375芯片配置完成标志
VAR_MainRXDataStatusMac  Bit 2FH.1    ;主端点数据接收状态机标志
;
;****************************************************************************
;主程序
                ORG   0000H            ;复位后单片机入口
                LJMP  START
                ORG   0013H            ;CH375中断
                LJMP  CH375_INTER

ORG 0100H
;---------------------------------------------------------------------------------

Initial_UART:
                Mov SCON,#50h
                Mov TMOD,#21h
                Mov TH1,#Reload_Count
                Mov TL1,#Reload_Count
                ORL PCON,#80h
                SETB TR1        ;启动定时器
                Ret

UART_Send_Char:                        ;通过串口发送字符,待发送的字符在ACC中
                CLR TI
                Mov SBUF,A
      Uart_Wait_Send_Finish:
                      JNB TI,UART_Wait_Send_Finish
                CLR TI
                Ret
;---------------------------------------------------------------------------------
START:
; 以下初始化指令不是必要的,将单片机恢复为默认状态
                CLR   EA               ;关中断
                MOV   SP,#STACK        ;置堆栈初值
                MOV   A,#0FFH
                MOV   P0,A
                MOV   P1,A             ;清端口状态
                MOV   P2,A
                MOV   P3,A
                CLR   A
                MOV   IE,A             ;清中断允许控制寄存器
                MOV   IP,A             ;清中断优先级控制寄存器
                MOV   PSW,A            ;清程序状态字
                MOV   TCON,A           ;清定时器/计数器控制寄存器
                MOV   TMOD,A           ;清定时器/计数器工作方式寄存器
                MOV   PCON,A           ;清电源控制寄存器
                MOV   R7,#0FFH
                CALL  DELAY_MS            ;延时等待CH375初始化完成
; 初始化
                Call Initial_UART
    UART_SendTestChar:
                Mov a,#c_Char_0
                call UART_Send_Char
                Mov a,#0DH
                call UART_Send_Char
                Mov a,#0AH
                call UART_Send_Char

                Mov a,#c_Char_8
                call UART_Send_Char
                Mov a,#0DH
                call UART_Send_Char
                Mov a,#0AH
                call UART_Send_Char

        ;        AJMP UART_SendTestChar
                MOV R6,#0;
                MOV R7,#0;
                MOV DPTR,#0
                ACALL READ_FLASH_SECTOR

                MOV DPTR,#0
                MOV R4,#4
    TEST_SEND_FLASHSECTOR_PAGE_LOOP:
                MOV R5,#128
    TEST_SEND_FLASHSECTOR_BYTE_LOOP:
                MOVX A,@DPTR
                call UART_Send_Char
                INC DPTR
                DJNZ R5,TEST_SEND_FLASHSECTOR_BYTE_LOOP
                DJNZ R4,TEST_SEND_FLASHSECTOR_PAGE_LOOP

                CALL  CH375_DisConnect    ;配置为断开USB连接的状态
                CALL  CH375_INIT       ;初始化
                call Init_EP2_FUNC_VAlRegister
                setb  EA
                ljmp  $    ;主程序
;

;-------------------------------------------------------------------
;------        STC MCU Flash PGM     --------------------------------
ISP_DATA       DATA 0E2H
ISP_ADDRH    DATA 0E3H
ISP_ADDRL    DATA 0E4H
ISP_CMD        DATA 0E5H
ISP_TRIG    DATA 0E6H
ISP_CONTR    DATA 0E7H
;定义Flash操作等待时间性
ENABLE_ISP    EQU 80H

MCU_FLASH_START_ADDRESS_HIGH EQU 80H

;读一字节
;调用前需打开IAP功能
;入口：DPTR = 字节地址
;返回：A = 读出字节
MCU_FLASH_READ_BYTE:
        MOV ISP_CONTR,#ENABLE_ISP
        MOV ISP_CMD,#01
        MOV ISP_ADDRH,DPH
        MOV ISP_ADDRL,DPL
        CLR EA
        MOV ISP_TRIG,#46H
        MOV ISP_TRIG,#0B9H
        NOP
        MOV A,ISP_DATA
        SETB EA
        ;Now in processing(CPU will hart here before completing)
;        ACALL IAP_Disable
        RET

;字节编程
;调用前需打开IAP功能
;入口：DPTR = 字节地址，A= 须编程字节的数据
MCU_FLASH_WRITE_BYTE:
        MOV ISP_CONTR,#ENABLE_ISP
        MOV ISP_CMD,#02
        MOV ISP_ADDRH,DPH
        MOV ISP_ADDRL,DPL
        MOV ISP_DATA,A
        CLR EA
        MOV ISP_TRIG,#46H
        MOV ISP_TRIG,#0B9H
        NOP
        SETB EA
        ;Now in processing(CPU will hart here before completing)
        ACALL IAP_Disable
        RET

;擦除扇区
;入口：DPTR = 扇区地址
MCU_FLASH_ERASE_SECTOR:
        MOV ISP_CONTR,#ENABLE_ISP
        MOV ISP_CMD,#03
        MOV ISP_ADDRH,DPH
        MOV ISP_ADDRL,DPL
        CLR EA
        MOV ISP_TRIG,#46H
        MOV ISP_TRIG,#0B9H
        NOP
        SETB EA
        ;Now in processing(CPU will hart here before completing)
;        ACALL IAP_Disable
        RET
IAP_Disable:
        MOV ISP_CONTR,#0
        MOV ISP_CMD,#0
        MOV ISP_TRIG,#0
        RET

;写数据到扇区
;入口地址（R6R7）扇区号
;DPTR指向数据缓冲区，数据长度恒定为512字节
WRITE_FLASH_SECTOR:
    PUSH DPH    ;数据缓冲区指针入栈保护
    PUSH DPL

    MOV A,R7
    ADD A,0E0H    ;A =A*2
    ADD A,#MCU_FLASH_START_ADDRESS_HIGH
    MOV R6,A
    MOV R7,#00    ;完成起始地址的计算数据在R6,R7中

    MOV DPH,R6
    MOV DPL,R7
    ACALL MCU_FLASH_ERASE_SECTOR

    MOV R3,#4
  WRITE_SECTOR_LOOP_WRITE_PAGE:
    MOV R4,#128;
  WRITE_SECTOR_LOOP_Write_Byte:
    POP DPL
    POP DPH
    MOVX A,@DPTR;
    INC DPTR
    PUSH DPH
    PUSH DPL

    MOV DPH,R6
    MOV DPL,R7
    ACALL MCU_FLASH_WRITE_BYTE
    INC DPTR
    MOV R7,DPL
    MOV R6,DPH

    DJNZ R4,WRITE_SECTOR_LOOP_Write_Byte
    DJNZ R3,WRITE_SECTOR_LOOP_Write_Page

    POP DPL
    POP DPH

    RET


;从扇区读数据到缓冲区
;入口地址（R6R7）扇区号
;DPTR指向数据缓冲区，数据长度恒定为512字节
READ_FLASH_SECTOR:
    PUSH DPH    ;数据缓冲区指针入栈保护
    PUSH DPL

    MOV A,R7
    ADD A,0E0H    ;A =A*2
    ADD A,#MCU_FLASH_START_ADDRESS_HIGH
    MOV R6,A
    MOV R7,#00    ;完成起始地址的计算数据在R6,R7中

    MOV DPH,R6
    MOV DPL,R7

    MOV R3,#4
  READ_SECTOR_LOOP_READ_PAGE:
    MOV R4,#128;
  READ_SECTOR_LOOP_READ_Byte:
    MOV DPH,R6
    MOV DPL,R7
    LCALL MCU_FLASH_READ_BYTE
    INC DPTR
    MOV R7,DPL
    MOV R6,DPH

     POP DPL
    POP DPH
    MOVX @DPTR,A;
    INC DPTR
    PUSH DPH
    PUSH DPL

    DJNZ R4,READ_SECTOR_LOOP_READ_Byte
    DJNZ R3,READ_SECTOR_LOOP_READ_PAGE

    POP DPL
    POP DPH

    RET

;------------------Flash PGM END----------------------------------------

; 输出命令码给CH375
; 输入: ACC 为命令码
; 输出: DPTR 为数据口
; USE: ACC, DPTR
WR_CMD_TO_375:
                MOV   DPTR,#CH375_CMD_PORT    ;命令口地址
                MOVX  @DPTR,A                ;设置USB工作模式
                NOP                            ;如果时钟频率低于20MHz则无需该指令延时,高于30MHz要多加2条指令
                MOV   DPTR,#CH375_DAT_PORT    ;数据口地址
                RET
;
; 初始化子程序
; USE:   ACC, R7, DPTR
CH375_INIT:
                MOV   A,#CMD_SET_USB_MODE    ;设置USB工作模式
                CALL  WR_CMD_TO_375            ;输出命令码
;                MOV   A,#02H                ;设置为内置固件模式
                MOV   A,#01H                ;设置为外置固件模式
                MOVX  @DPTR,A                ;设置为使用内置固件的USB设备方式
                NOP                            ;如果时钟频率低于16MHz则无需该指令延时
                NOP
CH375_INIT_WT:
                MOVX  A,@DPTR                ;返回操作状态,也可以等待20uS
                XRL   A,#CMD_RET_SUCCESS
                JNZ   CH375_INIT_WT            ;等待操作成功,通常需要等待10uS-20uS
; 下述三条指令用于启用中断
                CLR   IT1                    ;置外部信号为低电平触发
                SETB  PX1                    ;置高优先级
                CLR   IE1                    ;清中断标志
                SETB  EX1                    ;允许CH375中断
                RET
;**************************************************************************************
CH375_DisConnect:
                MOV   A,#CMD_SET_USB_MODE    ;设置USB工作模式
                CALL  WR_CMD_TO_375            ;输出命令码
                MOV   A,#00H                ;设置为未配置模式
                MOVX  @DPTR,A                ;设置为使用内置固件的USB设备方式
                NOP                            ;如果时钟频率低于16MHz则无需该指令延时
                NOP
CH375_DisConnect_WT:
                MOVX  A,@DPTR                ;返回操作状态,也可以等待20uS
                XRL   A,#CMD_RET_SUCCESS
                JNZ   CH375_DisConnect_WT            ;等待操作成功,通常需要等待10uS-20uS
; 下述三条指令用于启用中断
                CLR   IT1                    ;置外部信号为低电平触发
                SETB  PX1                    ;置高优先级
                CLR   IE1                    ;清中断标志
                SETB  EX1                    ;允许CH375中断
                RET

;写代码定间的数据到EP2的端点
;数据长度在R4中,数据缓冲区指针在DPTR中,采用MOVC取数
CH375_EP2_WRITE_CODEDATA:
                MOV R6,DPL
                MOV R7,DPH    ; SAVE DATA POINT

                MOV  A,#CMD_WR_USB_DATA7    ;发出写上传端点命令
                CALL  WR_CMD_TO_375
                MOV A,R4
                MOVX @DPTR,A            ;写数据长度

                JZ   CH375_EP2_WRITE_CODE_FINISH        ;长度为0

    EP2_WRITE_CODE_LOOP1:
                MOV DPL,R6    ;Get Data Point from backup DPTR Image
                MOV DPH,R7

                CLR A
                MOVC A,@A+DPTR

                INC DPTR
                MOV R6,DPL
                MOV R7,DPH    ; SAVE DATA POINT

                MOV DPTR,#CH375_DAT_PORT
                MOVX @DPTR,A
                DJNZ R4,EP2_WRITE_CODE_LOOP1
    CH375_EP2_WRITE_CODE_FINISH:

                RET
  ;---------------------------------------------------------------------------------------
;写数据空间的内容到CH372的EP端点
;数据长度在R4中,数据缓冲区指针在DPTR中,采用MOVX取数

CH375_EP2_WRITE_XDATA:
                MOV R6,DPL
                MOV R7,DPH    ; SAVE DATA POINT

                MOV  A,#CMD_WR_USB_DATA7    ;发出写上传端点命令
                CALL  WR_CMD_TO_375
                MOV A,R4
                MOVX @DPTR,A            ;写数据长度

                JZ   CH375_EP2_WRITE_CODE_FINISH        ;长度为0

    EP2_WRITE_XDATA_LOOP1:
                MOV DPL,R6    ;Get Data Point from backup DPTR Image
                MOV DPH,R7

                MOVX A,@DPTR

                INC DPTR
                MOV R6,DPL
                MOV R7,DPH    ; SAVE DATA POINT

                MOV DPTR,#CH375_DAT_PORT
                MOVX @DPTR,A
                DJNZ R4,EP2_WRITE_XDATA_LOOP1
    CH375_EP2_WRITE_XDATA_FINISH:

                RET

;----------------------------------------------------------------------------------------

c_EP2_UPSTATUS_TRANSMIT_IDLE         EQU   00H
c_EP2_UPSTATUS_TRANSMIT_CSW         EQU   01H
c_EP2_UPSTATUS_TRANSMIT_STANDPAGE     EQU   02H
c_EP2_UPSTATUS_TRANSMIT_SHORTPAGE     EQU   03H

;CMD_INQUIRY_FUNCTION
FUNC_SCSI_CMD10_INQUIRY:
                MOV DPTR,#USB_InquiryData_TAB
                MOV R4,#36
                CALL CH375_EP2_WRITE_CODEDATA
                MOV var_EP2_UP_STATUS,#c_EP2_UPSTATUS_TRANSMIT_CSW    ;发送完数据发状态
                RET
;CMD_READ_CAPACITY

FUNC_SCSI_CMD25_READ_CAPACITY:
                MOV DPTR,#USB_UDISK_Capacity
                MOV R4,#8
                CALL CH375_EP2_WRITE_CODEDATA
                MOV var_EP2_UP_STATUS,#c_EP2_UPSTATUS_TRANSMIT_CSW    ;发送完数据发状态
                RET
;CMD_READ_FORMAT_CAPACITIES
FUNC_SCSI_CMD23_READ_FORMAT_CAPACITYIES:
                MOV DPTR,#USB_UDISK_FORMAT_Capaities
                MOV R4,#20
                CALL CH375_EP2_WRITE_CODEDATA
                MOV var_EP2_UP_STATUS,#c_EP2_UPSTATUS_TRANSMIT_CSW    ;发送完数据发状态
                RET

;MCD00_TEST_UNITE_READY
FUNC_SCSI_CMD00_TEST_UNITE_READY:
                ACALL TransitCSW
                RET
;CMD_MODE_SENSE
FUNC_SCSI_CMD1A_MODE_SENSE:
                MOV A,CBW_Buffer+2    ;CBW[2] Value send to ACC
                CJNE A,#1CH,MODE_SENSE_NEXT1
                MOV DPTR,#USB_UDISK_MODE_SENSE_TPP
                MOV R4,#18
                CALL CH375_EP2_WRITE_CODEDATA

                AJMP MODE_SENSE_END
      MODE_SENSE_NEXT1:
                CJNE A,#3FH,MODE_SENSE_NEXT2
                MOV DPTR,#USB_UDISK_MODE_SENSE_ALL
                MOV R4,#12
                CALL CH375_EP2_WRITE_CODEDATA

                AJMP MODE_SENSE_END
    MODE_SENSE_NEXT2:
                MOV DPTR,#USB_UDISK_MODE_SENSE_ZERO
                MOV R4,#8
                CALL CH375_EP2_WRITE_CODEDATA

                AJMP MODE_SENSE_END

    MODE_SENSE_END:
                MOV var_EP2_UP_STATUS,#c_EP2_UPSTATUS_TRANSMIT_CSW    ;发送完数据发状态
                RET

;CMD28_READ10
FUNC_SCSI_CMD28_READ10:
                MOV A,    CBW_Buffer+8
                JNZ CMD28_Need_Trans_Data_Package
                ACALL TransitCSW
                AJMP CMD28_READ10_END
    CMD28_Need_Trans_Data_Package:
                MOV VAR_NeedTransBlockCount,A
                MOV VAR_TransCompleteBlockCount,#0
                MOV R7,    CBW_Buffer+5
                MOV R6, CBW_Buffer+4
                MOV VAR_ucTransFinishPageCount,#0
                MOV VAR_ucNeedTransPageCount,#8
                MOV DPTR,#0
                ACALL READ_FLASH_SECTOR
                MOV var_EP2_UP_STATUS,#c_EP2_UPSTATUS_TRANSMIT_STANDPAGE    ;发送完数据发状态
                MOV DPTR,#0
                MOV R4,#64
                CALL CH375_EP2_WRITE_XDATA
                INC VAR_ucTransFinishPageCount
    CMD28_READ10_END:
                RET

;CMD2A_WRITE10:
FUNC_SCSI_CMD2A_WRITE10:
                SETB VAR_MainRXDataStatusMac

                MOV A,    CBW_Buffer+8
                MOV VAR_NeedTransBlockCount,A

                MOV VAR_MainRXDataPackCount,#0
                MOV VAR_TransCompleteBlockCount,#0

                JNZ CMD2A_WRITE10_FINISH
                CLR VAR_MainRXDataStatusMac
       CMD2A_WRITE10_FINISH:
                RET
;---------------------------------------------------------------------------------------------
CMD12_INQUIRY             EQU     12H
CMD1A_MODE_SENSE         EQU     1AH
CMD28_READ10            EQU    28H
CMD25_READ_CAPACITY        EQU     25H
CMD23_READ_FORMAT_CAPACITIES     EQU     23H
CMD00_TEST_UNIT_READY        EQU     00H
CMD2F_VERIRY            EQU     2FH
CMD2A_WRITE10            EQU     2AH
CMD1E_MEDIUM_REMOVAL        EQU     1EH

;对EP2接收到的CBW进行解析和处理
;R4为数据长度
;数据内容在公共缓冲区中
EP2CMDProcess:
                MOV R0,#CMD_BUFFER+4    ;拷贝CSW内容
                MOV A,@R0
                MOV VAR_CSW_BYTE_4,A
                iNC R0
                MOV A,@R0
                MOV VAR_CSW_BYTE_5,A
                iNC R0
                MOV A,@R0
                MOV VAR_CSW_BYTE_6,A
                iNC R0
                MOV A,@R0
                MOV VAR_CSW_BYTE_7,A

                MOv R4,#12
                MOV R0,#CMD_BUFFER+15    ;拷贝UFI内容
                MOV R1,#CBW_Buffer
        COPY_CBW_LOOP_1:
                MOV A,@R0
                MOV @R1,A
                INC R0
                INC R1
                DJNZ R4,COPY_CBW_LOOP_1

                Mov a,#c_Char_1
                call UART_Send_Char
                Mov a,#c_Char_1
                call UART_Send_Char
                MOV A,CBW_Buffer
                call UART_Send_Char

                Mov a,#0DH
                call UART_Send_Char
                Mov a,#0AH
                call UART_Send_Char

                MOV A,CBW_Buffer

                CJNE A,#CMD12_INQUIRY,NO_CMD10_SEGMENT
                CALL FUNC_SCSI_CMD10_INQUIRY
                AJMP EP2_CMD_END
    NO_CMD10_SEGMENT:    CJNE A,#CMD25_READ_CAPACITY,NO_CMD25_SEGMENT
                CALL FUNC_SCSI_CMD25_READ_CAPACITY
                AJMP EP2_CMD_END
    NO_CMD25_SEGMENT:    CJNE A,#CMD23_READ_FORMAT_CAPACITIES,NO_CMD23_SEGMENT
                CALL FUNC_SCSI_CMD23_READ_FORMAT_CAPACITYIES
                AJMP EP2_CMD_END
    NO_CMD23_SEGMENT:    CJNE A,#CMD1A_MODE_SENSE,NO_CMD1A_SEGMENT
                CALL FUNC_SCSI_CMD1A_MODE_SENSE
                AJMP EP2_CMD_END
    NO_CMD1A_SEGMENT:    CJNE A,#CMD28_READ10,NO_CMD28_READ10
                CALL FUNC_SCSI_CMD28_READ10
                AJMP EP2_CMD_END
    NO_CMD28_READ10:    CJNE A,#CMD00_TEST_UNIT_READY,NO_CMD00_TESTUNITREADY
                CALL FUNC_SCSI_CMD00_TEST_UNITE_READY
                AJMP EP2_CMD_END
    NO_CMD00_TESTUNITREADY: CJNE A,#CMD2A_WRITE10,NO_CMD2A_WRITE10
                CALL FUNC_SCSI_CMD2A_WRITE10
                AJMP EP2_CMD_END
           NO_CMD2A_WRITE10:
    EP2_CMD_END:
                RET

;                Mov a,#c_Char_1
;                call UART_Send_Char
;                Mov a,#c_Char_0
;                call UART_Send_Char
;                Mov a,#0DH
;                call UART_Send_Char
;                Mov a,#0AH
;                call UART_Send_Char
;
;                Ret

DataFlash_WriteSector:
;                Mov a,#c_Char_1
;                call UART_Send_Char
;                Mov a,#c_Char_1
;                call UART_Send_Char
;                Mov a,#0DH
;                call UART_Send_Char
;                Mov a,#0AH
;                call UART_Send_Char
                MOV R7,    CBW_Buffer+5
                MOV R6, CBW_Buffer+4

                MOV A,R7
                ADD A,VAR_TransCompleteBlockCount
                MOV R7,A

                CLR A
                ADDC A,R6
                MOV R6,A

                MOV DPTR,#0
                ACALL WRITE_FLASH_SECTOR

                Ret

;-------------------------------------------------------------------------------------------------
TransitCSW:
;                Mov a,#c_Char_1
;                call UART_Send_Char
;                Mov a,#c_Char_2
;                call UART_Send_Char
;                Mov a,#0DH
;                call UART_Send_Char
;                Mov a,#0AH
;                call UART_Send_Char
;                MOV R6,DPL
;                MOV R7,DPH    ; SAVE DATA POINT

                MOV  A,#CMD_WR_USB_DATA7    ;发出写上传端点命令
                CALL  WR_CMD_TO_375
                MOV A,#13
                MOVX @DPTR,A            ;写数据长度

                MOV A,#0x55
                MOVX @DPTR,A            ;写数据长度
                MOV A,#0x53
                MOVX @DPTR,A            ;写数据长度
                MOV A,#0x42
                MOVX @DPTR,A            ;写数据长度
                MOV A,#0x53
                MOVX @DPTR,A            ;写数据长度

                MOV A,VAR_CSW_BYTE_4
                MOVX @DPTR,A
                MOV A,VAR_CSW_BYTE_5
                MOVX @DPTR,A
                MOV A,VAR_CSW_BYTE_6
                MOVX @DPTR,A