lcd_driver_io.asm

CM320X240LCD的驱动程序

$NOMOD51
      COM_ADDR      equ 0x7000
      DAT_ADDR      equ 0x3000
      LCD_CS        equ p2.7
      LCD_A0        equ P2.6
      LCD_RES       equ P1.0
      LCD_WR        equ P3.6
      LCD_RD        equ P3.7
$include (REG51.INC)
      

      ;proc segment code
      NAME  LCD_asm
      ?PR?LCD_COM_W?LCD_asm     segment code
   ;   ?PR?LCD_Data_W?LCD_asm     segment code
   ;   ?PR?MCD_Data_W?LCD_asm     segment code
      rseg    ?PR?LCD_COM_W?LCD_asm
      
      public LCD_COM_W
      public LCD_Data_W
      public MCD_DT_R
      
LCD_COM_W:
       push acc
       push psw
       setb LCD_CS
       setb LCD_A0
       setb LCD_WR
       setb LCD_RD
       clr LCD_CS
       clr LCD_WR
       mov acc,r7
       mov P0,acc
       nop
       setb LCD_WR
       setb LCD_CS
       pop psw
       pop acc
       ret
LCD_Data_W:
       push acc
       push psw
       clr LCD_A0
       clr LCD_CS
       clr LCD_WR
       mov acc,r7
       mov P0,acc
       nop
       setb LCD_WR
       setb LCD_A0
       setb LCD_CS
       pop psw
       pop acc
       ret
MCD_DT_R:
       push acc
       push psw
       clr LCD_A0
       clr LCD_CS
       clr LCD_RD
       nop
       setb LCD_RD
       mov acc,P0
    ;   mov r7,acc
       setb LCD_A0
       setb LCD_CS
       pop psw
       pop acc
       ret
end