156 lines
2.2 KiB
Z80 Assembly
156 lines
2.2 KiB
Z80 Assembly
org 100h
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siob_data equ 083h
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siob_ctrl equ 082h
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lcd_data equ 0dbh
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lcd_ctrl equ 0dah
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celcius_offset equ 08ah
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pressure_offset equ 0cah
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humid_offset equ 09eh
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bdos equ 0005h
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conout equ 02h
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conin equ 01h
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start:
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call init_lcd
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call init_siob
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call lcd_delay
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ld a,celcius_offset ; write celcius label
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out (lcd_ctrl),a
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call lcd_delay
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ld hl,clabel
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call print_str_to_lcd
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ld a,pressure_offset ; write pressure label
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out (lcd_ctrl),a
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call lcd_delay
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ld hl,plabel
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call print_str_to_lcd
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ld a,humid_offset ; write humidity label
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out (lcd_ctrl),a
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call lcd_delay
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ld hl,hlabel
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call print_str_to_lcd
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main:
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call read_char_b
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call print_char_to_lcd
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ld c,11
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call bdos
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or a
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jr z,main
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ret
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init_siob:
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ld a,018h ; channel reset
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out (siob_ctrl),a
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ld a,04h
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out (siob_ctrl),a ; wr4 baud settings
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ld a,0c4h
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out (siob_ctrl),a
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ld a,03h
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out (siob_ctrl),a ; rx enable
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ld a,0c1h
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out (siob_ctrl),a
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ld a,05h
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out (siob_ctrl),a ; tx settings
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ld a,0eah
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out (siob_ctrl),a
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ret
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init_lcd:
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ld a,38h
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out (lcd_ctrl),a ; function 8 bit, 2 lines, 5x8 dot font
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call lcd_delay
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ld a,0ch
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out (lcd_ctrl),a ; display on, cursor off, no blink
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call lcd_delay
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ld a,01h
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out (lcd_ctrl),a ; clear display
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ret
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lcd_delay:
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ld bc,500
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delay1:
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dec bc
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ld a,b
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or c
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jr nz,delay1
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ret
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read_char_b:
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wait:
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in a,(siob_ctrl)
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bit 0,a
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jr z,wait
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in a,(siob_data)
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ret
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print_char_to_lcd:
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cp a,0dh ; carriage return
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jr z,lcd_done
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cp a,0ah ; new line
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jr z,lcd_done
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cp a,054h ; T character
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call z,move_to_tempaddr
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cp a,050h ; P character
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call z,move_to_presaddr
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cp a,048h ; H character
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call z,move_to_humidaddr
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out (lcd_data),a
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lcd_done:
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ret
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print_str_to_lcd: ; place memory address in hl first
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ld a,(hl)
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or a
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jr z,print_done
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out (lcd_data),a
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call lcd_delay
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inc hl
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jr print_str_to_lcd
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print_done:
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ret
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move_to_tempaddr:
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ld c,a
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ld a,85h
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out (lcd_ctrl),a
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ld a,c
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ret
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move_to_presaddr:
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ld a,0c1h
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out (lcd_ctrl),a
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ret
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move_to_humidaddr:
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ld a,99h
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out (lcd_ctrl),a
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ret
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print_char:
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ld e,a
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ld c,conout
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call bdos
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ret
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clabel: DB 'degree C',0
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plabel: DB 'pascal',0
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hlabel: DB '% RH',0
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end start
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