;All Keyboard Code written by George Hotz ;The LCD Code was "Adapted" from Ubicom's VP device sx28l,osc4mhz,turbo,stackx_optionx reset main2 ;watch key,8,uhex key equ $0C temp equ $0D temp2 equ $0E stat equ $0F lcd_temp equ $08 lcd_count equ $09 dlycnt1 equ $0A dlycnt2 equ $0B int_period equ 217 lcd_control = ra lcd_ = ra.0 ; This ra output could be used ; for backlight or contrast. lcd_RS = rb.0 ; 0 = instruction, 1 = data lcd_RW = ra.2 ; 0 = write, 1 = read lcd_E = ra.3 ; 1,1-->0 is the LCD enable lcd_data = rb lcd_DB4 = rb.4 ; DB4 = Data bus line 4 (LSB) lcd_DB5 = rb.5 lcd_DB6 = rb.6 lcd_DB7 = rb.7 ; DB7 = Data bus line 7 (MSB) ; LCD Definitions ; LCD_Interface Constants. ; Commands LCD_Clear equ %00000001 LCD_Cursor_Home equ %00000010 LCD_Entry_Mode equ %00000100 LCD_Display_control equ %00001000 LCD_Cursor equ %00010000 LCD_Function equ %00100000 LCD_Set_CGRam equ %01000000 LCD_Set_DDRam equ %10000000 ; Control Bits LCD_S equ %00000001 ; Display Shift LCD_B equ %00000000 ; Cursor Blink LCD_ID equ %00000010 ; Cursor Position Decrement LCD_C equ %00000000 ; Cursor off/ on LCD_RL equ %00000100 ; Cursor direction (Right = 1 left =0) LCD_F equ %00000100 ; Character resolution 1= 5x10, 0= 5x7 LCD_D equ %00000100 ; Display 0n = 1 off = 0 LCD_SC equ %00001000 ; Shift 0=cursor 1=diaplay LCD_N equ %00001000 ; Number od lines 0 for 1 line LCD_DL equ %00010000 ; Data lines 0 for 4 data lines 1 for 8 data lines LCD_BF equ %10000000 ; Busy Flag, 0 = not busy LCD_Delay equ 255 main2 mode $0f mov stat,#0 call keyreset mov !rb,#%11110000 call @lcd_init mov W, #LCD_Clear ; Clear the screen call @lcd_write_command call @lcd_wait_busy ; Wait for the LCD main call scankey ;Gets one key mov W, #LCD_Clear ; Clear the screen call @lcd_write_command call @lcd_wait_busy ; Wait for the LCD call NCS ;Sets Num, Caps, or Scroll lock in var stat call LCD ;Prints to LCD jmp main ;-----------------Start of Subroutines-------------------- ;---------For LCD---------------- LCD mov W, #36 call @lcd_write_data call @lcd_wait_busy ; Wait mov w,#LCD_Delay mov temp,key rr temp rr temp rr temp rr temp and temp,#$F cja temp,#9,ok add temp,#48 jmp ok2 ok cjbe temp,#9,ok2 add temp,#55 ok2 mov W, temp call @lcd_write_data call @lcd_wait_busy ; Wait mov w,#LCD_Delay mov temp,key and temp,#$F cja temp,#9,ok3 add temp,#48 jmp ok4 ok3 cjbe temp,#9,ok4 add temp,#55 ok4 mov W, temp call @lcd_write_data call @lcd_wait_busy ; Wait mov w,#LCD_Delay jnb stat.3,erend; mov W, #32 call @lcd_write_data call @lcd_wait_busy ; Wait mov w,#LCD_Delay mov W, #69 call @lcd_write_data call @lcd_wait_busy ; Wait mov w,#LCD_Delay mov W, #88 call @lcd_write_data call @lcd_wait_busy ; Wait mov w,#LCD_Delay mov W, #84 call @lcd_write_data call @lcd_wait_busy ; Wait mov w,#LCD_Delay erend ret ;-------End For LCD-------------- NCS mov temp2,key mov temp,stat cjne temp2,#$58,Caps jb stat.2,Caps2 setb stat.2 jmp Caps Caps2 snb stat.2 clrb stat.2 Caps cjne temp2,#$77,Num jb stat.1,Num2 setb stat.1 jmp Num Num2 snb stat.1 clrb stat.1 Num cjne temp2,#$7E,Scroll jb stat.0,Scroll2 setb stat.0 jmp Scroll Scroll2 snb stat.0 clrb stat.0 Scroll cje temp,stat,ng mov key,#$ED call tbyte mov w,stat and w,#%00000111 mov key,w call tbyte ng ret keyreset mov key,#$FF call tbyte call rbyte cje key,#$AA,go jmp main2 go ret scankey ;Carry on for ext, Byte in key call rbyte cjne key,#$E0,noext call rbyte call rbyte call rbyte call rbyte setb stat.3 ret noext call rbyte call rbyte clrb stat.3 ret rbyte call ignore mov temp,#8 again jb ra.0,again stc jb ra.1,noclc clc noclc rr key again2 jnb ra.0,again2 djnz temp,again call ignore call ignore ret ignore jb ra.0,ignore ;After Falling Edge ignore2 jnb ra.0,ignore2 ;After Rising Edge ret tbyte mov temp2,#0 mov !RA,#%00000001 mov RA,#0 fall jb ra.0,fall ;After Falling Edge mov temp,#8 send1 jnb ra.0,send1 ;After Rising Edge movb ra.1,key.0 snb key.0 inc temp2 rr key send2 jb ra.0,send2 ;After Falling Edge djnz temp,send1 send3 jnb ra.0,send3 ;After Rising Edge not temp2 movb ra.1,temp2.0 send4 jb ra.0,send4 ;After Falling Edge clrb ra.1 mov !ra,#%00000011 call ignore call ignore call rbyte ret org $200 ;***************************************************************************************** ; Jump table for page 1 ; Enables CALLs to functions in the second half of the page ;***************************************************************************************** function_label_2 jmp function_label_2_ ;***************************************************************************************** ; Subroutines ;***************************************************************************************** ;********************************************************************************* ; Function: lcd_init ; ; Inputs: None ; ; Outputs: None ; ; Registers affected: W ; ; Functions Called: lcd_wait_busy, lcd_write_command ; ;********************************************************************************* ;************************************************************************* ; LCD initialization code. ; This code should be called at the beginning of the program to ; initialize the LCD display. It only needs to be called once. ;************************************************************************* lcd_init mov W,#0 ; Delays for 5.1ms at 50MIPS call @delay ; First, set the data length, number of display lines, and character font. ;------------------------------------------------------------------------------------------------------ ; RS-RA2 R/!W-RA3 DB7-RB7 DB6-RB6 DB5-RB5 DB4-RB4 DB3-RB3 DB2-RB2 DB1-RB1 DB0-RB0 Execution Time ; 0 0 0 0 1 DL N F * * 40us ;------------------------------------------------------------------------------------------------------ ; DL--Interface Data Length 0 = 4-bit interface 1 = 8-bit interface ; N --Number of Display Lines 0 = 1 line 1 = 2 lines ; F --Character Font 0 = 5*7 dots 1 = 5*10 dots call @lcd_wait_busy ; wait until the LCD is done initializing. mov W, #LCD_Function | LCD_C; to be sure, duplicate command to change to 4 bits on lower 4. call @lcd_write_command call @nopdel call @nopdel setb lcd_E ; Pulse LCD's enable pin. call @nopdel call @nopdel clrb lcd_E ; Force LCD to latch the data present on the data bus. call @lcd_wait_busy ; Wait until the LCD is finished processing. mov W, #LCD_Function | LCD_N ; call @lcd_write_command ; set for for 4 bits, 2 lines, and 5*7 dots call @lcd_wait_busy ; Wait until the LCD is finished processing. ; Next, turn the display on, turn the cursor on, and turn cursor blink on (so we know LCD is alive) ;------------------------------------------------------------------------------------------------------ ; RS-RA2 R/!W-RA3 DB7-RB7 DB6-RB6 DB5-RB5 DB4-RB4 DB3-RB3 DB2-RB2 DB1-RB1 DB0-RB0 Execution Time ; 0 0 0 0 0 0 1 D C B 40us ;------------------------------------------------------------------------------------------------------ ; D --Display ON/OFF control 0 = Display OFF 1 = Display ON ; C --Cursor ON/OFF control 0 = Cursor OFF 1 = Cursor ON ; B --Blink ON/OFF control 0 = Blink OFF 1 = Blink ON clr W call @lcd_write_command call @lcd_wait_busy ; Display off mov W, #LCD_Display_Control | LCD_D | LCD_C | LCD_B call @lcd_write_command ; turn display on, cursor on, and blink on.. call @lcd_wait_busy ; Wait until the LCD is finished processing. ; Next, set display so that the cursor moves as characters are entered. ;------------------------------------------------------------------------------------------------------ ; RS-RA2 R/!W-RA3 DB7-RB7 DB6-RB6 DB5-RB5 DB4-RB4 DB3-RB3 DB2-RB2 DB1-RB1 DB0-RB0 Execution Time ; 0 0 0 0 0 1 S/C R/L * * 40us ;------------------------------------------------------------------------------------------------------ ; S/C--Cursor move/Display Shift 0 = Cursor Move 1 = Shift Display ; R/L--Shift Direction 0 = Shift left 1 = Shift right mov W, #LCD_Cursor call @lcd_write_command ; set for cursor move and display shift. call @lcd_wait_busy ; Wait until the LCD is finished processing. ; Next, set entry mode (cursor move direction, shift or no shift). ;------------------------------------------------------------------------------------------------------ ; RS-RA2 R/!W-RA3 DB7-RB7 DB6-RB6 DB5-RB5 DB4-RB4 DB3-RB3 DB2-RB2 DB1-RB1 DB0-RB0 Execution Time ; 0 0 0 0 0 0 0 1 I/D S 40us ~ 1.64ms ;------------------------------------------------------------------------------------------------------ ; I/D--Increment/Decrement address 0 = Decrement Cursor Address 1 = Increment Cursor Address ; S --Display shift 0 = No shift 1 = Shift mov W, #LCD_Entry_Mode | LCD_ID call @lcd_write_command ; set for incrementing address and no shift.. call @lcd_wait_busy ; Wait until the LCD is finished processing. retp ; Return fron lcd_init ;********************************************************************************* ; Function: lcd_write_command ; ; Inputs: Command to write in W ; ; Outputs: None ; ; Registers affected: W , lcd_temp , lcd_count ; ; Functions Called: nopdel, NOTE: shared body with lcd_write_data ; ;********************************************************************************* lcd_write_command ;------------------------------------------------------------------------------------------------------ ; This function writes the command in W to the LCD display, using the 8-bit interface. The procedure is: ; 1. Clear RS ; 2. Set up R/!W ; 3. Write the data to the port ;------------------------------------------------------------------------------------------------------ clrb lcd_RS ; Drive RS low so LCD knows to write COMMAND. jmp lcd_write ; goto WRITE code ;********************************************************************************* ; Function: lcd_write_data ; ; Inputs: Data byte to write in W ; ; Outputs: None ; ; Registers affected: W, lcd_temp , lcd_count ; ; Functions Called: nopdel, NOTE BODY shared with lcd_write_command ; ;********************************************************************************* lcd_write_data ;------------------------------------------------------------------------------------------------------ ; This function writes the data in W to the LCD display, using the 8-bit interface. ; 1. Set RS ; 2. Set up R/!W ; 3. Write the data to the port ;------------------------------------------------------------------------------------------------------ setb lcd_RS ; Drive RS high so LCD knows to write DATA. lcd_write mov lcd_temp,W mov lcd_count,#2 mov w,#00h mov !lcd_data,w ; Switch the data pins to outputs clrb lcd_RW ; Drive R/!W low so LCD knows to WRITE. lcd_write_loop and lcd_data,#0Fh ; don't destroy the data in the lower 4 latches mov W,lcd_temp and W,#0f0h or lcd_data,W ; Write the data in W to the port latches. call @nopdel call @nopdel setb lcd_E ; Pulse LCD's enable pin. call @nopdel call @nopdel clrb lcd_E ; Force LCD to latch the data present on the data bus. call @nopdel call @nopdel swap lcd_temp decsz lcd_count jmp lcd_write_loop retp ; Return from lcd_write_command and lcd_write_data ;********************************************************************************* ; Function: lcd_wait_busy ; ; Inputs: None ; ; Outputs: None ; ; Registers affected: W ; ; Functions Called: nopdel ; ;********************************************************************************* lcd_wait_busy ; waits until the LCD is ready to accept a command. ;------------------------------------------------------------------------------------------------------ ; RS-RA2 R/!W-RA3 DB7-RB7 DB6-RB6 DB5-RB5 DB4-RB4 DB3-RB3 DB2-RB2 DB1-RB1 DB0-RB0 Execution Time ; 0 1 BF * ------------------DDRAM Address-------------- * 1us ;------------------------------------------------------------------------------------------------------ or W,#0f0h mov !lcd_data,W clrb lcd_RS ; clear RS for instruction setb lcd_RW ; set for READ. call @nopdel call @nopdel setb lcd_E ; set enable high to read busy flag call @nopdel call @nopdel ; wait for the LCD to tx data. mov W,lcd_data ; move the contents of the port to the W register clrb lcd_E ; clear LCD enable call @nopdel call @nopdel call @nopdel ; wait for the LCD to tx data. setb lcd_E ; set enable high to read busy flag call @nopdel call @nopdel ; wait for the LCD to tx data. clrb lcd_E ; clear LCD enable call @nopdel ; Give the LCD some time to itself. call @nopdel call @nopdel call @nopdel call @nopdel and W, #LCD_BF ; test W for zero (Z is cleared if LCD is busy) sb Z ; Busy Flag is MSB of data bus jmp lcd_wait_busy ; loop through again if the LCD is still busy setb lcd_RW retp ;********************************************************************************* ; Function: nopdel ; ; Inputs: None ; ; Outputs: None ; ; Registers affected: None ; ; Functions Called: None ; ;********************************************************************************* nopdel ; returns to main program in 11 cycles (11us@1MIPS) from call nop nop nop nop nop nop nop nop retp ; return from nopdel ;********************************************************************************* ; Function: delay ; ; Inputs: value passed in W ; ; Outputs: None ; ; Registers affected: W, dlycnt1, dlycnt2 ; ; Functions Called: None ; ;********************************************************************************* delay ; (delays for [((w-1) * 1ms )] at 1MIPS, or [((w-1) * 20us)] at 50MIPS ... 0<=W<=255) ;****************************************************************************************************** ; This function delays for ((W-1)*20us), plus/minus a few ns ;****************************************************************************************************** mov dlycnt1,W delay1 decsz dlycnt1; jmp loop1; retp ; return from delay loop1 mov w,#166; mov dlycnt2,W; loop; nop nop nop decsz dlycnt2; jmp loop; jmp delay1; ;********************************************************************************* ; Function: function_label_2_ ; ; Inputs: None ; ; Outputs: None ; ; Registers affected: None ; ; Functions Called: Dummy Stub function for jump table ; ;********************************************************************************* function_label_2_ retp ;***************************************************************************************** END ;End of program code ;*****************************************************************************************
| file: /Techref/scenix/lib/io/dev/keys/keyboardandlcd.src, 15KB, , updated: 2002/6/26 10:10, local time: 2024/11/16 00:40,
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