6502-OS/system/lcd.h65

;;********************************************************************************
;; @file
;; @brief LCD-W164B driver
;; @ingroup drivers
;; @device ELECTRONIC ASSEMBLY - W164B-NLW
;; @details
;;   The LCD must be connected to a W65C22N Interface Chip:
;;     - IO.RB0-7  -> LCD.D0-7 data lines
;;     - IO.RA5    -> LCD.RS   register select
;;     - IO.RA6    -> LCD.R/W  read/write
;;     - IO.RA7    -> LCD.E    enable
;; @requires IO: Base Address of IO Chip
;; @depends IO-W65C22N
;;********************************************************************************
.ifndef INCLUDE_LCD
INCLUDE_LCD = 1

.include "system/system.h65"

;;********************************************************************************
;; @brief LCD character display
;; @ingroup drivers
;;********************************************************************************
.scope lcd
LCD_IO = IO1
Import lcd,init,clear,print,print_char,set_position,set_custom_char
Import lcd,_cmd,_wait_nbusy,_write_ram,_read_ram,_set_dd_ram_addr_from_charcount
Import lcd,_charcount

; PIN MASKS
E       = %10000000
RW      = %01000000
RS      = %00100000

RA_MASK = %11100000

;;********************************************************************************
;; LCD Instructions 
;; @details See LCD-W164B datasheet for a complete list
;;********************************************************************************
.enum CMD
    CLEAR           = %00000001  ;; clear display
    ENTRY_MODE      = %00000110  ;; auto-shift cursor
    DISPLAY_ON      = %00001111  ;; everything on, with blinking cursor
    SHIFT_CUR_LEFT  = %00101000  ;; shift the cursor to the left
    SHIFT_DIS_LEFT  = %00111000  ;; shift the display to the left
    SHIFT_DIS_RIGHT = %00110000  ;; shift the display to the right
    SHIFT_CUR_RIGHT = %00100000  ;; shift the cursor to the right
    FUNCTION_SET    = %00111000  ;; 8-bit, 4 lines, 5x7 font
    SET_CG_ADDRESS  = %01000000  ;; or this with the address
    SET_ADDRESS     = %10000000  ;; or this with the address
.endenum

; LCD Constants
LINE1      = $00
LINE2      = $40
LINE3      = $10
LINE4      = $50

.endscope

;;********************************************************************************
;; @macro Clear the screen and print a null-terminated string
;; @param message: Address of the message or string literal
;; @details
;;  If message is  a string literal, it will be stored in rodata 
;;  and the address of this segment will be used
;;********************************************************************************
.macro Print message
    jsr lcd::clear
    .if .match(message, "")  ; message is a string literal -> store in rodata
        .pushseg
        .rodata
:       .asciiz message
        .popseg
        lda #<:-
        sta ARG0
        lda #>:-
        sta ARG1
    .else ; message is not a string
        lda #<message
        sta ARG0
        lda #>message
        sta ARG1
    .endif
    jsr lcd::print
.endmacro


;;********************************************************************************
;; @macro Print a null-terminated string
;; @param message: Address of the message or string literal
;;********************************************************************************
.macro PrintNC message
    .if .match(message, "")  ; message is a string literal -> store in rodata
        .pushseg
        .rodata
:       .asciiz message
        .popseg
        lda #<:-
        sta ARG0
        lda #>:-
        sta ARG1
    .else ; message is not a string
        lda #<message
        sta ARG0
        lda #>message
        sta ARG1
    .endif
    jsr lcd::print
.endmacro


;;********************************************************************************
;; @macro Set the cursor to the n-th position
;; @param n: Position [0,$40) or a register
;;********************************************************************************
.macro lcd_SetCursorPos n
    .if .match (n, a)
    .elseif .match (n, x)
        txa
    .elseif .match (n, y)
        tya
    .else
        lda #n
    .endif
    sta lcd::_charcount
    jsr lcd::_set_dd_ram_addr_from_charcount
.endmacro

;;********************************************************************************
;; @macro Move the cursor to the right
;; @param n: Number of characters to move n. Defaults to 1 if not provided
;;********************************************************************************
.macro lcd_IncrementCursor n
    .ifblank n
        inc lcd::_charcount
    .elseif n = 1
        inc lcd::_charcount
    .else
        lda lcd::_charcount
        add #n
        sta lcd::_charcount
    .endif
    jsr lcd::_set_dd_ram_addr_from_charcount
.endmacro

;;********************************************************************************
;; @macro Move the cursor to the left
;; @param n: Number of characters to move n. Defaults to 1 if not provided
;;********************************************************************************
.macro lcd_DecrementCursor n
    .ifblank n
        dec lcd::_charcount
    .elseif n = 1
        dec lcd::_charcount
    .else
        lda lcd::_charcount
        sub #n
        sta lcd::_charcount
    .endif
    jsr lcd::_set_dd_ram_addr_from_charcount
.endmacro
.endif  ; guard