Files
vhdl/lib/jasm/lcd.inc.jsm
T
jens d3bd08bb52 Initial import
git-svn-id: http://moon:8086/svn/vhdl/trunk@5 cc03376c-175c-47c8-b038-4cd826a8556b
2008-08-23 08:20:30 +00:00

208 lines
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; -------------------------------------------------
; lcd.inc.jsm
; -------------------------------------------------
; needs xmem-address definition for
; - lcd_port (LCD-Base)
; needs delay.inc.jsm
; -------------------------------------------------
lcd_cmd: equ 0x00
lcd_rd: equ 0x20
lcd_data: equ 0x40
lcd_enable: equ 0x80
LCD_CMD_Z1: equ 0x80
LCD_CMD_Z2: equ 0xC0
LCD_CMD_CLEAR: equ 0x01
; -------------------------------------------------
; Init LCD
; -------------------------------------------------
LCD_init: mov R2, 0x00
mov R0, 0x03
call _write_lcd
call delay10ms
mov R2, 0x00
mov R0, 0x03
call _write_lcd
call delay10ms
mov R2, 0x00
mov R0, 0x02
call _write_lcd
call delay1ms
; 1. Function set: 4-Bit mode, two display lines
mov R0, 0x28
call LCD_writecmd
; 2. Display on, no cursor
mov R0, 0x0C
call LCD_writecmd
; 3. Cursor shift during write
mov R0, 0x06
call LCD_writecmd
; 4. Display clear
mov R0, 0x01
call LCD_writecmd
ret
; -------------------------------------------------
; LCD_waitbsy
; -------------------------------------------------
LCD_waitbsy: push R0
bsy_loop: call LCD_readstat
and R0, 0x80
jz ex_bsy
call delay1us
jmp bsy_loop
ex_bsy: pop R0
ret
; -------------------------------------------------
; LCD_writecmd
; -------------------------------------------------
; R0 = cmd
LCD_writeaddr:
LCD_writecmd: push R2
mov R2, lcd_cmd
call LCD_write
pop R2
ret
; -------------------------------------------------
; LCD_putsx
; -------------------------------------------------
; R1 = address of null-terminated string in XMEM
LCD_putsx: push R0
putsx_loop: movx R0, (R1)
inc R1
tst R0
jz putsx_ex
call LCD_writechar
jmp putsx_loop
putsx_ex: pop R0
ret
; -------------------------------------------------
; LCD_putsc
; -------------------------------------------------
; R1 = address of null-terminated string in CMEM
LCD_putsc: push R0
putsc_loop: movc R0, (R1)
inc R1
tst R0
jz putsc_ex
call LCD_writechar
jmp putsc_loop
putsc_ex: pop R0
ret
; -------------------------------------------------
; LCD_writechar
; -------------------------------------------------
; R0 = char
LCD_writedata:
LCD_writechar: push R2
mov R2, lcd_data
call LCD_write
pop R2
ret
; -------------------------------------------------
; LCD_write
; -------------------------------------------------
; R0 = input
; R2 = register
LCD_write: call LCD_waitbsy
push R0
swap R0
call _write_lcd
pop R0
call _write_lcd
ret
; -------------------------------------------------
; LCD_readstat
; -------------------------------------------------
; R0 = status
LCD_readstat: push R2
mov R2, lcd_cmd
call LCD_read
pop R2
ret
; -------------------------------------------------
; LCD_read
; -------------------------------------------------
; R0 = output
; R2 = register
LCD_read: call _read_lcd
swap R0
push R0
call _read_lcd
pop R2
or R0, R2
ret
; -------------------------------------------------
; _write
; -------------------------------------------------
; R0 = input
_write_lcd: push R1
and R0, 0x0F
mov R1, R0
or R1, R2
xout (lcd_port), R1
call delay1us
mov R1, R0
or R1, R2
or R1, lcd_enable
xout (lcd_port), R1
call delay1us
mov R1, R0
or R1, R2
xout (lcd_port), R1
call delay1us
or R1, lcd_rd
xout (lcd_port), R1
pop R1
ret
; -------------------------------------------------
; _read
; -------------------------------------------------
; R0 = output
_read_lcd: push R1
mov R1, lcd_rd
or R1, R2
xout (lcd_port), R1
call delay1us
mov R1, lcd_rd
or R1, R2
or R1, lcd_enable
xout (lcd_port), R1
call delay1us
xin R0, (lcd_port)
and R0, 0x0F
mov R1, lcd_rd
or R1, R2
xout (lcd_port), R1
call delay1us
pop R1
ret