initial commit
This commit is contained in:
commit
34ae22b6a5
1
.gitignore
vendored
Normal file
1
.gitignore
vendored
Normal file
@ -0,0 +1 @@
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||||
out/
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11
Makefile
Normal file
11
Makefile
Normal file
@ -0,0 +1,11 @@
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GDK ?= /opt/SGDK
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SRC = src
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OUT = out
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all:
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$(MAKE) -f $(GDK)/makefile_wine.gen GDK=$(GDK) WINE=wine \
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SRC=$(SRC) OUT=$(OUT)
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clean:
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$(MAKE) -f $(GDK)/makefile_wine.gen clean GDK=$(GDK) WINE=wine \
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SRC=$(SRC) OUT=$(OUT)
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33
src/boot/rom_head.c
Normal file
33
src/boot/rom_head.c
Normal file
@ -0,0 +1,33 @@
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#include "genesis.h"
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__attribute__((externally_visible))
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const ROMHeader rom_header = {
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#if (ENABLE_BANK_SWITCH != 0)
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"SEGA SSF ",
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#elif (MODULE_MEGAWIFI != 0)
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"SEGA MEGAWIFI ",
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#else
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"SEGA MEGA DRIVE ",
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#endif
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"(C)SGDK 2024 ",
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"SAMPLE PROGRAM ",
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"SAMPLE PROGRAM ",
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"GM 00000000-00",
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0x000,
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"JD ",
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0x00000000,
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#if (ENABLE_BANK_SWITCH != 0)
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0x003FFFFF,
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#else
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0x000FFFFF,
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#endif
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0xE0FF0000,
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0xE0FFFFFF,
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"RA",
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0xF820,
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0x00200000,
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0x0020FFFF,
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" ",
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"DEMONSTRATION PROGRAM ",
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"JUE "
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};
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367
src/boot/sega.s
Normal file
367
src/boot/sega.s
Normal file
@ -0,0 +1,367 @@
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#include "task_cst.h"
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.section .text.keepboot
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*-------------------------------------------------------
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*
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* Sega startup code for the GNU Assembler
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* Translated from:
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* Sega startup code for the Sozobon C compiler
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* Written by Paul W. Lee
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* Modified by Charles Coty
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* Modified by Stephane Dallongeville
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*
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*-------------------------------------------------------
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.globl rom_header
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.org 0x00000000
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_Start_Of_Rom:
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_Vecteurs_68K:
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dc.l __stack /* Stack address */
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dc.l _Entry_Point /* Program start address */
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dc.l _Bus_Error
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dc.l _Address_Error
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dc.l _Illegal_Instruction
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dc.l _Zero_Divide
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dc.l _Chk_Instruction
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dc.l _Trapv_Instruction
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dc.l _Privilege_Violation
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dc.l _Trace
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dc.l _Line_1010_Emulation
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dc.l _Line_1111_Emulation
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dc.l _Error_Exception, _Error_Exception, _Error_Exception, _Error_Exception
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dc.l _Error_Exception, _Error_Exception, _Error_Exception, _Error_Exception
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dc.l _Error_Exception, _Error_Exception, _Error_Exception, _Error_Exception
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dc.l _Error_Exception
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dc.l _INT
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dc.l _EXTINT
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dc.l _INT
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dc.l hintCaller
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dc.l _INT
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dc.l _VINT
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dc.l _INT
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dc.l _trap_0 /* Resume supervisor task */
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dc.l _INT,_INT,_INT,_INT,_INT,_INT,_INT
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dc.l _INT,_INT,_INT,_INT,_INT,_INT,_INT,_INT
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dc.l _INT,_INT,_INT,_INT,_INT,_INT,_INT,_INT
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dc.l _INT,_INT,_INT,_INT,_INT,_INT,_INT,_INT
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rom_header:
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.incbin "out/rom_head.bin", 0, 0x100
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_Entry_Point:
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* disable interrupts
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move #0x2700,%sr
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* Configure a USER_STACK_LENGTH bytes user stack at bottom, and system stack on top of it
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move %sp, %usp
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sub #USER_STACK_LENGTH, %sp
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* Halt Z80 (need to be done as soon as possible on reset)
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move.l #0xA11100,%a0 /* Z80_HALT_PORT */
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move.w #0x0100,%d0
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move.w %d0,(%a0) /* HALT Z80 */
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move.w %d0,0x0100(%a0) /* END RESET Z80 */
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tst.l 0xa10008
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bne.s SkipInit
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tst.w 0xa1000c
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bne.s SkipInit
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* Check Version Number
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move.b -0x10ff(%a0),%d0
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andi.b #0x0f,%d0
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beq.s NoTMSS
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* Sega Security Code (SEGA)
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move.l #0x53454741,0x2f00(%a0)
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NoTMSS:
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jmp _start_entry
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SkipInit:
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jmp _reset_entry
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*------------------------------------------------
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*
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* interrupt functions
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*
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*------------------------------------------------
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_INT:
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movem.l %d0-%d1/%a0-%a1,-(%sp)
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move.l intCB, %a0
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jsr (%a0)
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movem.l (%sp)+,%d0-%d1/%a0-%a1
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rte
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_EXTINT:
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movem.l %d0-%d1/%a0-%a1,-(%sp)
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move.l eintCB, %a0
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jsr (%a0)
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movem.l (%sp)+,%d0-%d1/%a0-%a1
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rte
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_VINT:
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btst #5, (%sp) /* Skip context switch if not in user task */
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bne.s no_user_task
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tst.w task_lock
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bne.s 1f
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move.w #0, -(%sp) /* TSK_superPend() will return 0 */
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bra.s unlock /* If lock == 0, supervisor task is not locked */
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1:
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bcs.s no_user_task /* If lock < 0, super is locked with infinite wait */
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subq.w #1, task_lock /* Locked with wait, subtract 1 to the frame count */
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bne.s no_user_task /* And do not unlock if we did not reach 0 */
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move.w #1, -(%sp) /* TSK_superPend() will return 1 */
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unlock:
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/* Save bg task registers (excepting a7, that is stored in usp) */
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move.l %a0, task_regs
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lea (task_regs + UTSK_REGS_LEN), %a0
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movem.l %d0-%d7/%a1-%a6, -(%a0)
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move.w (%sp)+, %d0 /* Load return value previously pushed to stack */
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move.w (%sp)+, task_sr /* Pop user task sr and pc, and save them, */
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move.l (%sp)+, task_pc /* so they can be restored later. */
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movem.l (%sp)+, %d2-%d7/%a2-%a6 /* Restore non clobberable registers */
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no_user_task:
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/* At this point, we always have in the stack the SR and PC of the task */
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/* we want to jump after processing the interrupt, that might be the */
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/* point where we came from (if there is no context switch) or the */
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/* supervisor task (if we unlocked it). */
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movem.l %d0-%d1/%a0-%a1,-(%sp)
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ori.w #0x0001, intTrace /* in V-Int */
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addq.l #1, vtimer /* increment frame counter (more a vint counter) */
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btst #3, VBlankProcess+1 /* PROCESS_XGM_TASK ? (use VBlankProcess+1 as btst is a byte operation) */
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beq.s no_xgm_task
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jsr XGM_doVBlankProcess /* do XGM vblank task */
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no_xgm_task:
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btst #1, VBlankProcess+1 /* PROCESS_BITMAP_TASK ? (use VBlankProcess+1 as btst is a byte operation) */
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beq.s no_bmp_task
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jsr BMP_doVBlankProcess /* do BMP vblank task */
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no_bmp_task:
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move.l vintCB, %a0 /* load user callback */
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jsr (%a0) /* call user callback */
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andi.w #0xFFFE, intTrace /* out V-Int */
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movem.l (%sp)+,%d0-%d1/%a0-%a1
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rte
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*------------------------------------------------
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*
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* Copyright (c) 1988 by Sozobon, Limited. Author: Johann Ruegg
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*
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* Permission is granted to anyone to use this software for any purpose
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* on any computer system, and to redistribute it freely, with the
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* following restrictions:
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* 1) No charge may be made other than reasonable charges for reproduction.
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* 2) Modified versions must be clearly marked as such.
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* 3) The authors are not responsible for any harmful consequences
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* of using this software, even if they result from defects in it.
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*
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*------------------------------------------------
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ldiv:
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move.l 4(%a7),%d0
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bpl ld1
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neg.l %d0
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ld1:
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move.l 8(%a7),%d1
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bpl ld2
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neg.l %d1
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eor.b #0x80,4(%a7)
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ld2:
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bsr i_ldiv /* d0 = d0/d1 */
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tst.b 4(%a7)
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bpl ld3
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neg.l %d0
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ld3:
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rts
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lmul:
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move.l 4(%a7),%d0
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bpl lm1
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neg.l %d0
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lm1:
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move.l 8(%a7),%d1
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bpl lm2
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neg.l %d1
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eor.b #0x80,4(%a7)
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lm2:
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bsr i_lmul /* d0 = d0*d1 */
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tst.b 4(%a7)
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bpl lm3
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neg.l %d0
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lm3:
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rts
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||||
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lrem:
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move.l 4(%a7),%d0
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bpl lr1
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neg.l %d0
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lr1:
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move.l 8(%a7),%d1
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bpl lr2
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neg.l %d1
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lr2:
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bsr i_ldiv /* d1 = d0%d1 */
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||||
move.l %d1,%d0
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tst.b 4(%a7)
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bpl lr3
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neg.l %d0
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lr3:
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||||
rts
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||||
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||||
ldivu:
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move.l 4(%a7),%d0
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move.l 8(%a7),%d1
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bsr i_ldiv
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||||
rts
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||||
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||||
lmulu:
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move.l 4(%a7),%d0
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||||
move.l 8(%a7),%d1
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||||
bsr i_lmul
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||||
rts
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||||
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||||
lremu:
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||||
move.l 4(%a7),%d0
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||||
move.l 8(%a7),%d1
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||||
bsr i_ldiv
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||||
move.l %d1,%d0
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||||
rts
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||||
*
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||||
* A in d0, B in d1, return A*B in d0
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||||
*
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||||
i_lmul:
|
||||
move.l %d3,%a2 /* save d3 */
|
||||
move.w %d1,%d2
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||||
mulu %d0,%d2 /* d2 = Al * Bl */
|
||||
|
||||
move.l %d1,%d3
|
||||
swap %d3
|
||||
mulu %d0,%d3 /* d3 = Al * Bh */
|
||||
|
||||
swap %d0
|
||||
mulu %d1,%d0 /* d0 = Ah * Bl */
|
||||
|
||||
add.l %d3,%d0 /* d0 = (Ah*Bl + Al*Bh) */
|
||||
swap %d0
|
||||
clr.w %d0 /* d0 = (Ah*Bl + Al*Bh) << 16 */
|
||||
|
||||
add.l %d2,%d0 /* d0 = A*B */
|
||||
move.l %a2,%d3 /* restore d3 */
|
||||
rts
|
||||
*
|
||||
*A in d0, B in d1, return A/B in d0, A%B in d1
|
||||
*
|
||||
i_ldiv:
|
||||
tst.l %d1
|
||||
bne nz1
|
||||
|
||||
* divide by zero
|
||||
* divu #0,%d0 /* cause trap */
|
||||
move.l #0x80000000,%d0
|
||||
move.l %d0,%d1
|
||||
rts
|
||||
nz1:
|
||||
move.l %d3,%a2 /* save d3 */
|
||||
cmp.l %d1,%d0
|
||||
bhi norm
|
||||
beq is1
|
||||
* A<B, so ret 0, rem A
|
||||
move.l %d0,%d1
|
||||
clr.l %d0
|
||||
move.l %a2,%d3 /* restore d3 */
|
||||
rts
|
||||
* A==B, so ret 1, rem 0
|
||||
is1:
|
||||
moveq.l #1,%d0
|
||||
clr.l %d1
|
||||
move.l %a2,%d3 /* restore d3 */
|
||||
rts
|
||||
* A>B and B is not 0
|
||||
norm:
|
||||
cmp.l #1,%d1
|
||||
bne not1
|
||||
* B==1, so ret A, rem 0
|
||||
clr.l %d1
|
||||
move.l %a2,%d3 /* restore d3 */
|
||||
rts
|
||||
* check for A short (implies B short also)
|
||||
not1:
|
||||
cmp.l #0xffff,%d0
|
||||
bhi slow
|
||||
* A short and B short -- use 'divu'
|
||||
divu %d1,%d0 /* d0 = REM:ANS */
|
||||
swap %d0 /* d0 = ANS:REM */
|
||||
clr.l %d1
|
||||
move.w %d0,%d1 /* d1 = REM */
|
||||
clr.w %d0
|
||||
swap %d0
|
||||
move.l %a2,%d3 /* restore d3 */
|
||||
rts
|
||||
* check for B short
|
||||
slow:
|
||||
cmp.l #0xffff,%d1
|
||||
bhi slower
|
||||
* A long and B short -- use special stuff from gnu
|
||||
move.l %d0,%d2
|
||||
clr.w %d2
|
||||
swap %d2
|
||||
divu %d1,%d2 /* d2 = REM:ANS of Ahi/B */
|
||||
clr.l %d3
|
||||
move.w %d2,%d3 /* d3 = Ahi/B */
|
||||
swap %d3
|
||||
|
||||
move.w %d0,%d2 /* d2 = REM << 16 + Alo */
|
||||
divu %d1,%d2 /* d2 = REM:ANS of stuff/B */
|
||||
|
||||
move.l %d2,%d1
|
||||
clr.w %d1
|
||||
swap %d1 /* d1 = REM */
|
||||
|
||||
clr.l %d0
|
||||
move.w %d2,%d0
|
||||
add.l %d3,%d0 /* d0 = ANS */
|
||||
move.l %a2,%d3 /* restore d3 */
|
||||
rts
|
||||
* A>B, B > 1
|
||||
slower:
|
||||
move.l #1,%d2
|
||||
clr.l %d3
|
||||
moreadj:
|
||||
cmp.l %d0,%d1
|
||||
bhs adj
|
||||
add.l %d2,%d2
|
||||
add.l %d1,%d1
|
||||
bpl moreadj
|
||||
* we shifted B until its >A or sign bit set
|
||||
* we shifted #1 (d2) along with it
|
||||
adj:
|
||||
cmp.l %d0,%d1
|
||||
bhi ltuns
|
||||
or.l %d2,%d3
|
||||
sub.l %d1,%d0
|
||||
ltuns:
|
||||
lsr.l #1,%d1
|
||||
lsr.l #1,%d2
|
||||
bne adj
|
||||
* d3=answer, d0=rem
|
||||
move.l %d0,%d1
|
||||
move.l %d3,%d0
|
||||
move.l %a2,%d3 /* restore d3 */
|
||||
rts
|
||||
BIN
src/gfx/pointer.png
Normal file
BIN
src/gfx/pointer.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 3.6 KiB |
68
src/main.c
Normal file
68
src/main.c
Normal file
@ -0,0 +1,68 @@
|
||||
#include "genesis.h"
|
||||
|
||||
#define MOUSE_PORT ((volatile u8*)0xA10003)
|
||||
#define Z80_HALT *((volatile u16*)0xA11100)
|
||||
|
||||
#define MOUSE_DELAY 32
|
||||
|
||||
static inline void delay() {
|
||||
for(int i=0;i<MOUSE_DELAY;i++) asm volatile("nop");
|
||||
}
|
||||
|
||||
|
||||
int main() {
|
||||
VDP_setTextPlane(0);
|
||||
VDP_drawText("Sega Mega Mouse RAW reader", 2, 16);
|
||||
|
||||
u8 nibbles[16];
|
||||
int x = 0;
|
||||
int y = 0;
|
||||
|
||||
|
||||
|
||||
while(TRUE) {
|
||||
|
||||
SYS_doVBlankProcess();
|
||||
|
||||
VDP_clearTextArea(0, 0, 40, 13);
|
||||
|
||||
// считываем нибблы напрямую
|
||||
Z80_HALT = 0x0100;
|
||||
*MOUSE_PORT = 0x60; delay();
|
||||
*MOUSE_PORT = 0x60; delay();
|
||||
|
||||
for(int i=1;i<10;i++) {
|
||||
*MOUSE_PORT = (i&1)?0x00:0x20;
|
||||
delay();
|
||||
nibbles[i] = *MOUSE_PORT & 0x0F;
|
||||
delay();
|
||||
}
|
||||
|
||||
*MOUSE_PORT = 0x60; delay();
|
||||
Z80_HALT = 0x0000;
|
||||
|
||||
// выводим нибблы на экран
|
||||
char buf[64];
|
||||
int dx = (nibbles[6] << 4) | nibbles[7];
|
||||
int dy = (nibbles[8] << 4) | nibbles[9];
|
||||
|
||||
if (nibbles[3]&8) dy = 255;
|
||||
if (nibbles[3]&4) dx = 255;
|
||||
if (nibbles[3]&2) dy = -dy;
|
||||
if (nibbles[3]&1) dx = -dx;
|
||||
|
||||
x+=dx;
|
||||
y+=dy;
|
||||
|
||||
|
||||
sprintf(buf, "dx: %+04d dy: %+04d x: %+04d y: %+04d", dx,dy,x/64,y/64);
|
||||
VDP_drawText(buf, 2, 12);
|
||||
sprintf(buf, "buttons: %c%c%c%c", (nibbles[4]&8&&1)+'0',(nibbles[4]&4&&1)+'0',(nibbles[4]&2&&1)+'0',(nibbles[4]&1&&1)+'0');
|
||||
VDP_drawText(buf, 2, 10);
|
||||
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
1
src/resource.res
Normal file
1
src/resource.res
Normal file
@ -0,0 +1 @@
|
||||
SPRITE pointer "gfx/pointer.png" 6 6 FAST
|
||||
Loading…
x
Reference in New Issue
Block a user