mirror of
https://github.com/cc65/cc65.git
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First few nes files by groepaz
git-svn-id: svn://svn.cc65.org/cc65/trunk@2056 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz
parent
442df28524
commit
63b0537eb7
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@ -170,7 +170,7 @@ cbm510lib:
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cbm610lib:
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for i in cbm610 cbm common runtime conio dbg em; do \
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CC=$(CC) \
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CC=$(CC) \
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AS=$(AS) \
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LD=$(LD) \
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AFLAGS="-t cbm610 -I../../asminc" \
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@ -212,6 +212,21 @@ geoslib:
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cp geos/devel/*.joy .
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cp geos/devel/geos-tgi.tgi geos-tgi.tgi
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#-----------------------------------------------------------------------------
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# NES
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neslib:
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for i in nes common runtime conio em tgi; do \
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CC=$(CC) \
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AS=$(AS) \
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LD=$(LD) \
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AFLAGS="-t nes -I../../asminc" \
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CFLAGS="-Osir -g -T -t nes -I../../include" \
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$(MAKE) -C $$i || exit 1; \
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$(AR) a nes.lib $$i/*.o;\
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done
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mv nes/crt0.o nes.o
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#-----------------------------------------------------------------------------
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# CBM PET machines
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@ -325,7 +325,7 @@ _rs232_done:
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; * function will return RS_ERR_NO_DATA, so this is not a fatal error.
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; */
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;
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_rs232_get:
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bit Initialized
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bpl NotInitialized ; Jump if not initialized
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@ -342,7 +342,7 @@ _rs232_get:
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; Check for buffer empty
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@L2: lda RecvFreeCnt
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@L2: lda RecvFreeCnt ; (25)
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cmp #$ff
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bne @L3
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lda #RS_ERR_NO_DATA
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@ -351,7 +351,7 @@ _rs232_get:
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; Check for flow stopped & enough free: release flow control
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@L3: ldx Stopped
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@L3: ldx Stopped ; (34)
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beq @L4
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cmp #63
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bcc @L4
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@ -363,11 +363,11 @@ _rs232_get:
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; Get byte from buffer
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@L4: ldx RecvHead
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@L4: ldx RecvHead ; (41)
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lda RecvBuf,x
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inc RecvHead
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inc RecvFreeCnt
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ldx #$00
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ldx #$00 ; (59)
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sta (ptr1,x)
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txa ; Return code = 0
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rts
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@ -532,7 +532,7 @@ _rs232_status:
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NmiHandler:
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pha
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lda ACIA+RegStatus ;(4) ;status ;check for byte received
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lda ACIA+RegStatus ;(4) ;status ;check for byte received
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and #$08 ;(2)
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beq @L9 ;(2*)
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cld
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@ -540,7 +540,7 @@ NmiHandler:
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pha
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tya
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pha
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lda ACIA+RegStatus ;(4) opt ;status ;check for receive errors
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lda ACIA+RegStatus ;(4) opt ;status ;check for receive errors
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and #$07 ;(2) opt
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beq @L1 ;(3*)opt
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inc Errors ;(5^)opt
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36
libsrc/nes/Makefile
Normal file
36
libsrc/nes/Makefile
Normal file
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@ -0,0 +1,36 @@
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#
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# makefile for CC65 runtime library
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#
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.SUFFIXES: .o .s .c
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#--------------------------------------------------------------------------
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# Rules
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%.o: %.c
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@$(CC) $(CFLAGS) $<
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@$(AS) -o $@ $(AFLAGS) $(*).s
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%.o: %.s
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@$(AS) -g -o $@ $(AFLAGS) $<
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#--------------------------------------------------------------------------
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# Object files
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C_OBJS =
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S_OBJS = _scrsize.o \
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crt0.o
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#--------------------------------------------------------------------------
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# Targets
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.PHONY: all clean zap
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all: $(C_OBJS) $(S_OBJS)
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clean:
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@rm -f $(C_OBJS:.c=.s) $(C_OBJS) $(S_OBJS)
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zap: clean
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20
libsrc/nes/_scrsize.s
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20
libsrc/nes/_scrsize.s
Normal file
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@ -0,0 +1,20 @@
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;
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; Ullrich von Bassewitz, 2003-04-14
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;
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; Screen size function
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;
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.export screensize
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.include "nes.inc"
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.proc screensize
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ldx #screenrows
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ldy #charsperline
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rts
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.endproc
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231
libsrc/nes/crt0.s
Normal file
231
libsrc/nes/crt0.s
Normal file
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@ -0,0 +1,231 @@
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;
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; Startup code for cc65 (NES version)
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;
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; by Groepaz/Hitmen <groepaz@gmx.net>
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; based on code by Ullrich von Bassewitz <uz@cc65.org>
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;
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; This must be the *first* file on the linker command line
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;
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.export _exit
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.import initlib, donelib
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.import push0, _main, zerobss
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.import ppubuf_flush
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; Linker generated symbols
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.import __RAM_START__, __RAM_SIZE__
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.import __SRAM_START__, __SRAM_SIZE__
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.import __ROM0_START__, __ROM0_SIZE__
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.import __STARTUP_LOAD__,__STARTUP_RUN__, __STARTUP_SIZE__
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.import __CODE_LOAD__,__CODE_RUN__, __CODE_SIZE__
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.import __RODATA_LOAD__,__RODATA_RUN__, __RODATA_SIZE__
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.import __DATA_LOAD__,__DATA_RUN__, __DATA_SIZE__
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.include "zeropage.inc"
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.include "nes.inc"
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; ------------------------------------------------------------------------
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; 16 bytes INES header
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.segment "HEADER"
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; +--------+------+------------------------------------------+
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; | Offset | Size | Content(s) |
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; +--------+------+------------------------------------------+
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; | 0 | 3 | 'NES' |
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; | 3 | 1 | $1A |
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; | 4 | 1 | 16K PRG-ROM page count |
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; | 5 | 1 | 8K CHR-ROM page count |
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; | 6 | 1 | ROM Control Byte #1 |
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; | | | %####vTsM |
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; | | | | ||||+- 0=Horizontal mirroring |
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; | | | | |||| 1=Vertical mirroring |
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; | | | | |||+-- 1=SRAM enabled |
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; | | | | ||+--- 1=512-byte trainer present |
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; | | | | |+---- 1=Four-screen mirroring |
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; | | | | | |
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; | | | +--+----- Mapper # (lower 4-bits) |
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; | 7 | 1 | ROM Control Byte #2 |
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; | | | %####0000 |
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; | | | | | |
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; | | | +--+----- Mapper # (upper 4-bits) |
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; | 8-15 | 8 | $00 |
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; | 16-.. | | Actual 16K PRG-ROM pages (in linear |
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; | ... | | order). If a trainer exists, it precedes |
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; | ... | | the first PRG-ROM page. |
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; | ..-EOF | | CHR-ROM pages (in ascending order). |
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; +--------+------+------------------------------------------+
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.byte $4e,$45,$53,$1a ; "nes\n"
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.byte 2 ; ines prg - Specifies the number of 16k prg banks.
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.byte 1 ; ines chr - Specifies the number of 8k chr banks.
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.byte %00000011 ; ines mir - Specifies VRAM mirroring of the banks.
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.byte %00000000 ; ines map - Specifies the NES mapper used.
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.byte 0,0,0,0,0,0,0,0 ; 8 zeroes
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; ------------------------------------------------------------------------
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; Create an empty LOWCODE segment to avoid linker warnings
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.segment "LOWCODE"
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; ------------------------------------------------------------------------
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; Place the startup code in a special segment.
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.segment "STARTUP"
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start:
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; setup the CPU and System-IRQ
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sei
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cld
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ldx #0
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stx VBLANK_FLAG
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stx ringread
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stx ringwrite
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stx ringcount
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txs
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lda #$20
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@l: sta ringbuff,x
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sta ringbuff+$0100,x
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sta ringbuff+$0200,x
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inx
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bne @l
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; Clear the BSS data
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jsr zerobss
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; Copy the .data segment to RAM
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lda #<(__ROM0_START__ + __STARTUP_SIZE__+ __CODE_SIZE__+ __RODATA_SIZE__)
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sta ptr1
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lda #>(__ROM0_START__ + __STARTUP_SIZE__+ __CODE_SIZE__+ __RODATA_SIZE__)
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sta ptr1+1
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lda #<(__DATA_RUN__)
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sta ptr2
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lda #>(__DATA_RUN__)
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sta ptr2+1
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ldx #>(__DATA_SIZE__)
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@l2: beq @s1 ; no more full pages
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; copy one page
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ldy #0
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@l1: lda (ptr1),y
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sta (ptr2),y
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iny
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bne @l1
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inc ptr1+1
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inc ptr2+1
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dex
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bne @l2
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; copy remaining bytes
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@s1:
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; copy one page
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ldy #0
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@l3: lda (ptr1),y
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sta (ptr2),y
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iny
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cpy #<(__DATA_SIZE__)
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bne @l3
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; setup the stack
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lda #<(__SRAM_START__ + __SRAM_SIZE__)
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sta sp
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lda #>(__SRAM_START__ + __SRAM_SIZE__)
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sta sp+1 ; Set argument stack ptr
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; Call module constructors
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jsr initlib
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; Push arguments and call main()
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jsr callmain
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; Call module destructors. This is also the _exit entry.
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_exit: jsr donelib ; Run module destructors
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; Reset the NES
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jmp start
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; ------------------------------------------------------------------------
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; System V-Blank Interupt
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; updates PPU Memory (buffered)
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; updates VBLANK_FLAG and _tickcount
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; ------------------------------------------------------------------------
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nmi: pha
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tya
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pha
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txa
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pha
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lda #1
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sta VBLANK_FLAG
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inc _tickcount
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bne @s
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inc _tickcount+1
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@s: jsr ppubuf_flush
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; reset the video counter
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lda #$20
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sta PPU_VRAM_ADDR2
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lda #$00
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sta PPU_VRAM_ADDR2
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; reset scrolling
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sta PPU_VRAM_ADDR1
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sta PPU_VRAM_ADDR1
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pla
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tax
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pla
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tay
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pla
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; Interrupt exit
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irq2:
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irq1:
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timerirq:
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irq:
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rti
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; ------------------------------------------------------------------------
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; hardware vectors
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; ------------------------------------------------------------------------
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.segment "VECTORS"
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.word irq2 ; $fff4 ?
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.word irq1 ; $fff6 ?
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.word timerirq ; $fff8 ?
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.word nmi ; $fffa vblank nmi
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.word start ; $fffc reset
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.word irq ; $fffe irq / brk
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; ------------------------------------------------------------------------
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; character data
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; ------------------------------------------------------------------------
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.segment "CHARS"
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.incbin "nes/neschar.bin"
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93
libsrc/nes/nes.inc
Normal file
93
libsrc/nes/nes.inc
Normal file
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@ -0,0 +1,93 @@
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;
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; NES definitions. By Groepaz/Hitmem.
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;
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;; FIXME: optimize zeropage usage
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SCREEN_PTR = $62 ;2
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CRAM_PTR = $64 ;2
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CHARCOLOR = $66
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BGCOLOR = $67
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RVS = $68
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CURS_X = $69
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CURS_Y = $6a
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_tickcount = $6b ;2
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VBLANK_FLAG = $70
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ringbuff = $0200
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ringwrite = $71
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ringread = $72
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ringcount = $73
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ppuhi = $74
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ppulo = $75
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ppuval = $76
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screenrows = (32-4)
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charsperline = 32
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xsize = charsperline
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;; PPU defines
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PPU_CTRL1 = $2000
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PPU_CTRL2 = $2001
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PPU_STATUS = $2002
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PPU_SPR_ADDR = $2003
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PPU_SPR_IO = $2004
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PPU_VRAM_ADDR1 = $2005
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PPU_VRAM_ADDR2 = $2006
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PPU_VRAM_IO = $2007
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;; APU defines
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APU_PULSE1CTRL = $4000 ; Pulse #1 Control Register (W)
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APU_PULSE1RAMP = $4001 ; Pulse #1 Ramp Control Register (W)
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APU_PULSE1FTUNE = $4002 ; Pulse #1 Fine Tune (FT) Register (W)
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APU_PULSE1CTUNE = $4003 ; Pulse #1 Coarse Tune (CT) Register (W)
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APU_PULSE2CTRL = $4004 ; Pulse #2 Control Register (W)
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APU_PULSE2RAMP = $4005 ; Pulse #2 Ramp Control Register (W)
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APU_PULSE2FTUNE = $4006 ; Pulse #2 Fine Tune Register (W)
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APU_PULSE2STUNE = $4007 ; Pulse #2 Coarse Tune Register (W)
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APU_TRICTRL1 = $4008 ; Triangle Control Register #1 (W)
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APU_TRICTRL2 = $4009 ; Triangle Control Register #2 (?)
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APU_TRIFREQ1 = $400A ; Triangle Frequency Register #1 (W)
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APU_TRIFREQ2 = $400B ; Triangle Frequency Register #2 (W)
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APU_NOISECTRL = $400C ; Noise Control Register #1 (W)
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;;APU_ = $400D ; Unused (???)
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APU_NOISEFREQ1 = $400E ; Noise Frequency Register #1 (W)
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APU_NOISEFREQ2 = $400F ; Noise Frequency Register #2 (W)
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APU_MODCTRL = $4010 ; Delta Modulation Control Register (W)
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APU_MODDA = $4011 ; Delta Modulation D/A Register (W)
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APU_MODADDR = $4012 ; Delta Modulation Address Register (W)
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APU_MODLEN = $4013 ; Delta Modulation Data Length Register (W)
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APU_SPR_DMA = $4014 ; Sprite DMA Register (W)
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APU_CHANCTRL = $4015 ; Sound/Vertical Clock Signal Register (R)
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APU_PAD1 = $4016 ; Joypad #1 (RW)
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APU_PAD2 = $4017 ; Joypad #2/SOFTCLK (RW)
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CH_HLINE = 11
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CH_VLINE = 14
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CH_ULCORNER = 176
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CH_URCORNER = 174
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CH_LLCORNER = 173
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CH_LRCORNER = 189
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CH_TTEE = 178
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CH_RTEE = 179
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CH_BTEE = 177
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CH_LTEE = 171
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CH_CROSS = 123
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CH_CURS_UP = 145
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CH_CURS_DOWN = 17
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CH_CURS_LEFT = 157
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CH_CURS_RIGHT = 29
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CH_PI = 126
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CH_DEL = 20
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CH_INS = 148
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CH_ENTER = 10
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CH_STOP = 3
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CH_ESC = 27
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