penguin86/pato-z80-home-computer
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Bugfix, refactoring

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Daniele Verducci su MatissePenguin
2021-02-25 23:26:13 +01:00
parent 0697bc3753
commit 1d4c4f8d3f
4 changed files with 817 additions and 817 deletions
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56
pat80-io-devices/composite-pal-adapter/software/avr-assembly/main.asm
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@@ -25,32 +25,30 @@
.include "m1284def.inc" ; Atmega 1280 device definition
; *** reserved registers ***
; Cursor Position
; POS_COLUMN (0-46) represents the character/chunk column
; POS_ROWP (0-255) represent the chunk row. The caracter row is POS_ROWP/FONT_HEIGHT
.def POS_COLUMN = r21
.def POS_ROWP = r20
; Internal registers
.def A = r0 ; accumulator
; Video generator registers:
; X(R27, R26)
.def STATUS = r25 ; signal status (see STATUS TABLE)
;POS_COARSE = Y ; coarse position (aligned to character column)
;DRAWING_BYTE = X ; current position in framebuffer
.def VG_HIGH_ACCUM = r24 ; an accumulator in high registers to be used only by video_generator in interrupt
.def LINE_COUNTER = r23
.def VG_HIGH_ACCUM = r22 ; an accumulator in high registers to be used only by video_generator in interrupt
.def HIGH_ACCUM = r16 ; an accumulator in high registers to be used outside of interrupts
; define constant
; Character generator registers:
.def POS_COLUMN = r22 ; POS_COLUMN (0-46) represents the character/chunk column
.def POS_ROWP = r21 ; POS_ROWP (0-255) represent the chunk row. The caracter row is POS_ROWP/FONT_HEIGHT
.def HIGH_ACCUM = r20 ; an accumulator in high registers to be used outside of interrupts
.def A = r0 ; general purpose accumulator to be used outside of interrupts
; Hardware pins and ports
.equ VIDEO_PORT_OUT = PORTA ; Used all PORTA, but connected only PA0
.equ SYNC_PIN = PC0 ; Sync pin (pin 22)
.equ DEBUG_PIN = PC1 ; DEBUG: Single vertical sync pulse to trigger oscilloscope (pin 23)
.equ DATA_PORT_IN = PINB
.equ CLK_PIN = PD0
.equ RS_PIN = PD1
.equ BUSY_PIN = PD2
.equ DATA_PORT_IN = PIND
.equ CLK_PIN = PC2
.equ RS_PIN = PC3
.equ BUSY_PIN = PC4
; memory
.equ FRAMEBUFFER = 0x0100
.equ FRAMEBUFFER_END = 0x2F00
; Memory map
.equ FRAMEBUFFER = 0x0F70
.equ FRAMEBUFFER_END = 0x3C00
.equ SCREEN_HEIGHT = 248
; start vector
@@ -77,19 +75,7 @@ main:
; **** MEMORY SETUP ****
; clear ram
;*** Load data into ram ***
Set X to 0x0100
ldi XH, high(FRAMEBUFFER)
ldi XL, low(FRAMEBUFFER)
load_mem_loop:
clr r17
st X+, r17
; if reached the last framebuffer byte, exit cycle
cpi XH, 0b00111110
brne load_mem_loop ; if not 0, repeat h_picture_loop
cpi XL, 0b11000000
brne load_mem_loop ; if not 0, repeat h_picture_loop
call clear_screen
@@ -118,7 +104,7 @@ main:
; **** MAIN ROUTINE ****
; Wait for data (it never exits)
; jmp comm_init
;jmp comm_init
; draw example image
@@ -144,7 +130,7 @@ main:
inc r18
cpi r18, 0x5B
brne draw_chars
call draw_carriage_return
; call draw_carriage_return
jmp dctest
@@ -160,4 +146,4 @@ main:
.include "character_generator.asm" ; Character generator
;.include "communication.asm" ; Communication with Pat80
.include "font.asm" ; Font face
.include "example_data/cat.asm" ; Cat image
;.include "example_data/cat.asm" ; Cat image