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Split bios in multiple asm files

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This commit is contained in:
Daniele Verducci su MatissePenguin 2020-10-27 20:08:07 +01:00
parent 20abf66411
commit 5d881511dc
3 changed files with 53 additions and 40 deletions
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2
assembly/Makefile → assembly/bios/Makefile
View File

@ -1,5 +1,5 @@
bios: bios:
z80asm -i pat80_bios_0.1.asm -o rom.bin z80asm -i main.asm -o rom.bin
dd if=/dev/zero of=rom.bin bs=1 count=0 seek=8192 dd if=/dev/zero of=rom.bin bs=1 count=0 seek=8192
minipro -w rom.bin -p "AT28C64B" minipro -w rom.bin -p "AT28C64B"

45
assembly/pat80_bios_0.1.asm → assembly/bios/driver_hd44780.asm
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@ -1,42 +1,8 @@
; Pat80 BIOS v0.01 ; HD44780 20x4 characters LCD display driver
; @author: Daniele Verducci ; @author Daniele Verducci
;
; ROM is at 0x00
; RAM is at 0x80
; LCD is at I/O 0x00 and 0x01
jp sysinit ; Startup vector: DO NOT MOVE! Must be the first instruction
; SYSTEM CONFIGURATION ; functions
LCD_INSTR_REG: EQU %00000000
LCD_DATA_REG: EQU %00000001
; CONSTANTS
SYSINIT_GREETING:
DB "Pat80 BIOS v0.1 ",0 ; null terminated string
; System initialization
sysinit:
call lcd_init
; write characters to display
ld bc, SYSINIT_GREETING
call lcd_write ; write string to screen
call lcd_cls ; clear screen
halt
lcd_init: lcd_init:
;reset procedure ;reset procedure
@ -57,13 +23,14 @@ lcd_init:
; Writes text starting from current cursor position ; Writes text starting from current cursor position
; @param BC Pointer to a null-terminated string first character ; @param BC Pointer to a null-terminated string first character
lcd_write: lcd_print:
ld a, (bc) ; bc is the pointer to passed string's first char ld a, (bc) ; bc is the pointer to passed string's first char
cp 0 ; compare A content with 0 (subtract 0 from value and set zero flag Z if result is 0) cp 0 ; compare A content with 0 (subtract 0 from value and set zero flag Z if result is 0)
ret z ; if prev compare is true (Z flag set), string is finished, return ret z ; if prev compare is true (Z flag set), string is finished, return
out (LCD_DATA_REG),a ; output char out (LCD_DATA_REG),a ; output char
inc bc ; increment bc to move to next char inc bc ; increment bc to move to next char
jp lcd_write
jp lcd_print
; Set cursor position ; Set cursor position
; @param B X-axis position (0 to 19) ; @param B X-axis position (0 to 19)

46
assembly/bios/main.asm Normal file
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@ -0,0 +1,46 @@
; Pat80 BIOS v0.01
; @author: Daniele Verducci
;
; ROM is at 0x00
; RAM is at 0x80
; LCD is at I/O 0x00 and 0x01
jp sysinit ; Startup vector: DO NOT MOVE! Must be the first instruction
; SYSTEM CONFIGURATION
LCD_INSTR_REG: EQU %00000000
LCD_DATA_REG: EQU %00000001
; CONSTANTS
SYSINIT_GREETING:
DB "Pat80 BIOS v0.1",0 ; null terminated string
LIPSUM:
DB "Lorem ipsum dolor sit amet, consectetur adipiscing elit.",0
include 'driver_hd44780.asm'
; System initialization
sysinit:
call lcd_init
; write characters to display
ld bc, SYSINIT_GREETING
call lcd_print ; write string to screen
ld bc, LIPSUM
call lcd_print
;call lcd_cls ; clear screen
halt