mirror of
https://github.com/JorjBauer/aiie.git
synced 2025-01-13 22:32:00 +00:00
483 lines
15 KiB
C++
483 lines
15 KiB
C++
#include "mouse.h"
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#include <string.h>
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#include "globals.h"
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#include "mouse-rom.h"
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enum {
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SW_W_INIT = 0x00,
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SW_R_HOMEMOUSE = 0x08,
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SW_R_POSMOUSE = 0x09,
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SW_R_CLEARMOUSE = 0x0A,
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SW_R_READMOUSE = 0x0B,
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SW_R_INITMOUSE = 0x0C,
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SW_W_CLAMPMOUSE = 0x0D,
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SW_R_SERVEMOUSE = 0x0E,
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SW_W_SETMOUSE = 0x0F
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};
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// The first 3 soft switch bits technically should pass directly to
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// the PIA6821. In practice, so far, I've only seen the first (SW_W_INIT)
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// used when PR#4 is invoked to initialize the mouse interface from DOS,
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// so for the moment I'll just catch that specifically.
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enum {
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ST_MOUSEENABLE = 1,
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ST_INTMOUSE = 2,
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ST_INTBUTTON = 4,
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ST_INTVBL = 8
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};
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Mouse::Mouse()
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{
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status = 0;
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interruptsTriggered = 0;
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lastX = lastY = 0;
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lastButton = false;
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}
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Mouse::~Mouse()
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{
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}
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bool Mouse::Serialize(int8_t fd)
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{
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return true;
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}
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bool Mouse::Deserialize(int8_t fd)
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{
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return true;
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}
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void Mouse::Reset()
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{
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}
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uint8_t Mouse::readSwitches(uint8_t s)
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{
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switch (s) {
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default:
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printf("mouse: unknown switch read 0x%X\n", s);
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};
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return 0xFF;
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}
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void Mouse::writeSwitches(uint8_t s, uint8_t v)
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{
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switch (s) {
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case SW_R_HOMEMOUSE:
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g_mouse->setPosition( (g_ram.readByte(0x578) << 8) | g_ram.readByte(0x478),
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(g_ram.readByte(0x5F8) << 8) | g_ram.readByte(0x4F8)
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);
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break;
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case SW_R_POSMOUSE:
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g_mouse->setPosition( (g_ram.readByte(0x578+4) << 8) | g_ram.readByte(0x478+4),
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(g_ram.readByte(0x5F8+4) << 8) | g_ram.readByte(0x4F8+4)
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);
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break;
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case SW_R_CLEARMOUSE:
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g_ram.writeByte(0x578+4, 0);
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g_ram.writeByte(0x478+4, 0);
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g_ram.writeByte(0x5F8+4, 0);
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g_ram.writeByte(0x4F8+4, 0);
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g_mouse->setPosition(0,0);
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break;
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case SW_R_READMOUSE:
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{
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uint16_t xpos, ypos;
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g_mouse->getPosition(&xpos, &ypos);
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if (lastX != xpos || lastY != ypos) {
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interruptsTriggered |= 0x20; // "x or y changed since last reading"
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lastX = xpos; lastY = ypos;
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}
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curButton = g_mouse->getButton();
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uint8_t newStatus = g_ram.readByte(0x778+4) & ~0xC0;
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if (curButton) { newStatus |= 0x80; };
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if (lastButton) { newStatus |= 0x40; };
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uint16_t xv = xpos >> 8; xv &= 0xFF;
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printf("XPOS: %d => 0x%X 0x%X\n", xpos, xv, xpos & 0xFF);
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g_ram.writeByte(0x578+4, xv); // high X
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g_ram.writeByte(0x478+4, xpos & 0xFF); // low X
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g_ram.writeByte(0x5F8+4, (ypos >> 8) & 0xFF); // high Y
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g_ram.writeByte(0x4F8+4, ypos); // low Y
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}
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break;
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case SW_R_INITMOUSE:
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// Set clamp to (0,0) - (1023,1023)
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g_ram.writeByte(0x578, 0); // high of lowclamp
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g_ram.writeByte(0x478, 0); // low of lowclamp
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g_ram.writeByte(0x5F8, 0x03); // high of highclamp
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g_ram.writeByte(0x4F8, 0xFF); // low of highclamp
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g_mouse->setClamp(XCLAMP, 0, 1023);
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g_mouse->setClamp(YCLAMP, 0, 1023);
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break;
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case SW_R_SERVEMOUSE:
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if (lastButton) interruptsTriggered |= 0x40;
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if (curButton != lastButton) {
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interruptsTriggered |= 0x80;
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lastButton = curButton;
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}
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g_ram.writeByte(0x778+4, interruptsTriggered);
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g_ram.writeByte(0x6B8+4, interruptsTriggered); // hack to appease ROM
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interruptsTriggered = 0;
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break;
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case SW_W_INIT:
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v &= 0x03; // just the low 3 bits apparently?
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printf("Simple init: value is 0x%X\n", v);
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status = v;
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g_ram.writeByte(0x7f8 + 4, v);
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break;
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case SW_W_CLAMPMOUSE:
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{
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uint16_t lowval = (g_ram.readByte(0x578) << 8) | (g_ram.readByte(0x478));
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uint16_t highval = (g_ram.readByte(0x5F8) << 8) | (g_ram.readByte(0x4F8));
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if (v) {
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g_mouse->setClamp(YCLAMP, lowval, highval);
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} else {
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// X is clamping
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g_mouse->setClamp(XCLAMP, lowval, highval);
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}
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}
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break;
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case SW_W_SETMOUSE:
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status = v;
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g_ram.writeByte(0x7f8 + 4, v);
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break;
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default:
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printf("mouse: unknown switch write 0x%X = 0x%2X\n", s, v);
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break;
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}
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}
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void Mouse::loadROM(uint8_t *toWhere)
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{
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/* Actual mouse ROM Disassembly:
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C400- 2C 58 FF BIT $FF58 ; test bits in FF58 w/ A
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C403- 70 1B BVS $C420 ; V will contain bit 6 from $FF58, which should be $60 on boot-up (RTS), which has $40 set, so should branch here
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C405- 38 SEC
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C406- 90 18 BCC $C420 ; no-op; unless called @ $C406 directly?
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C408- B8 CLV ; clear overflow
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C409- 50 15 BVC $C420 ; always branches
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; unused... ? more lookup table... ?
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C40B- 01 20 ORA ($20,X)
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C40D- AE AE AE LDX $AEAE
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; This is the lookup table for entry addresses
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C410- AE
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C411- 00
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C412- 6D ;(setmouse @ c46d)
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C413- 75 ;(servemouse @ C475)
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C414- 8E ;(readmouse @ C48E)
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C415- 9F ;(clearmouse @ C49F)
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C416- A4 ;(posmouse @ C4A4)
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C417- 86 ;(clampmouse @ C486)
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C418- A9 ;(homemouse @ C4A9)
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C419- 97 ;(initmouse @ C497)
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C41A- AE
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C41B- AE
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C41C- AE ;(semi-documented: sets mouse frequency handler to 60 or 50 hz)
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C41D- AE
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C41E- AE
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C41F- AE
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; Main (installs KSW for IN# handling)
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C420- 48 PHA ; push accumulator to stack
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C421- 98 TYA
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C422- 48 PHA ; push Y to stack
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C423- 8A TXA
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C424- 48 PHA ; push X to stack
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C425- 08 PHP ; push status to stack
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C426- 78 SEI ; disable interrupts
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; This JSR $FF58 is a trick to get the address we're calling from. By
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; default, $FF58 contains a RTS (until patched as the DOS '&' vector,
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; or ProDOS does something similar). As long as this executes before
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; the DOS takes over, it's safe; but if we're doing this after ProDOS
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; loads, a 64k machine might have garbage after the language card RAM
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; is loaded here. A safer alternative would be something like
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; LDA #$60 ; Write an RTS ($60) to a temporary memory
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; STA WORK ; address, and then
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; JSR WORK ; jump to it
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; TSX
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; LDA $100, X ; grab the return address off the stack
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C427- 20 58 FF JSR $FF58 ; call something that will RTS
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C42A- BA TSX ; pull stack pointer to X
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C42B- BD 00 01 LDA $0100,X ; grab A from the current stack pointer, which has our return addr
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C42E- AA TAX ; X = return addr
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C42F- 0A ASL
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C430- 0A ASL
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C431- 0A ASL
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C432- 0A ASL
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C433- A8 TAY ; Y = (return addr) << 4
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C434- 28 PLP ; restore status from stack (includes V,C)
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C435- 50 0F BVC $C446 ; overflow is clear from when we were called?
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C437- A5 38 LDA $38 ; >> $38 is the IN# vector ("KSW") low byte
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C439- D0 0D BNE $C448 ; restore stack & return
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C43B- 8A TXA
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C43C- 45 39 EOR $39 ; >> KSW high byte
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C43E- D0 08 BNE $C448 ; restore stack & return
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C440- A9 05 LDA #$05
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C442- 85 38 STA $38 ; ($38) = $05
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C444- D0 0B BNE $C451
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;; we wind up here when the entry vector $c405 is called directly (from $9eba)
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C446- B0 09 BCS $C451 ; carry set if ... ?
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;; entry point when called as PR# so BASIC/DOS can init the mouse
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C448- 68 PLA ; pull X from stack
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C449- AA TAX
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C44A- 68 PLA ; pull Y from stack, but
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C44B- EA NOP ; throw it away
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C44C- 68 PLA ; pull A from stack
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C44D- 99 80 C0 STA $C080,Y ; LC RAM bank2, read and wr-protect
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C450- 60 RTS
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C451- 99 81 C0 STA $C081,Y ; LC RAM bank 2, read ROM
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C454- 68 PLA ;
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C455- BD 38 06 LDA $0638,X
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C458- AA TAX
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C459- 68 PLA
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C45A- A8 TAY
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C45B- 68 PLA
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C45C- BD 00 02 LDA $0200,X ; keyboard character buffer?
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C45F- 60 RTS
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C460- 00 BRK
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C461- 00 BRK
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C462- 00 BRK
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C463- 00 BRK
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C464- 00 BRK
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C465- 00 BRK
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C466- 00 BRK
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C467- 00 BRK
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C468- 00 BRK
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C469- 00 BRK
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C46A- 00 BRK
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C46B- 00 BRK
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C46C- 00 BRK
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; SetMouse
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C46D- C9 10 CMP #$10 ; interrupt on VBL + interrupt on mouse move?
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C46F- B0 3F BCS $C4B0 ; RTS if A >= 0x10
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C471- 99 82 C0 STA $C082,Y ; LC RAM bank 2, read ROM, wr-protect RAM
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C474- 60 RTS
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; ServeMouse
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C475- 48 PHA ; save A
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C476- 18 CLC
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C477- 90 39 BCC $C4B2 ; always branches
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; ServeMouse cleanup and exit
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C479- 99 83 C0 STA $C083,Y ; LC RAM bank 2, read RAM
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C47C- BD B8 06 LDA $06B8,X ; apparently this is where the new status wound up, also $7f8 + <slot#>
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C47F- 29 0E AND #$0E
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C481- D0 01 BNE $C484 ; if the interrupt bits don't show it was a mouse interrupt, set error (C) before returning
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C483- 38 SEC
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C484- 68 PLA ; restore A
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C485- 60 RTS
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; ClampMouse
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C486- C9 02 CMP #$02
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C488- B0 26 BCS $C4B0 ; RTS if 2 <= the A register
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C48A- 99 83 C0 STA $C083,Y ; LC RAM bank 2, read RAM
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C48D- 60 RTS
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; ReadMouse
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C48E- A9 04 LDA #$04
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C490- 99 83 C0 STA $C083,Y ; LC RAM bank 2, read RAM
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C493- 18 CLC
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C494- EA NOP
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C495- EA NOP
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C496- 60 RTS
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; InitMouse
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C497- EA NOP
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C498- A9 02 LDA #$02
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C49A- 99 83 C0 STA $C083,Y ; LC RAM bank 2, read RAM
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C49D- 18 CLC
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C49E- 60 RTS
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; ClearMouse
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C49F- EA NOP
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C4A0- A9 05 LDA #$05
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C4A2- D0 F6 BNE $C49A
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; PosMouse
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C4A4- EA NOP
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C4A5- A9 06 LDA #$06
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C4A7- D0 F1 BNE $C49A
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; HomeMouse
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C4A9- EA NOP
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C4AA- A9 07 LDA #$07
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C4AC- D0 EC BNE $C49A
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; "TimeData" to set freq before init to 50/60 Hz? Doesn't look like it...
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C4AE- A2 03 LDX #$03
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C4B0- 38 SEC
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C4B1- 60 RTS
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; ServeMouse main worker
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C4B2- 08 PHP
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C4B3- A5 00 LDA $00
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C4B5- 48 PHA
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C4B6- A9 60 LDA #$60
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C4B8- 85 00 STA $00
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C4BA- 78 SEI
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C4BB- 20 00 00 JSR $0000
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C4BE- BA TSX
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C4BF- 68 PLA
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C4C0- 85 00 STA $00
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C4C2- BD 00 01 LDA $0100,X
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C4C5- 28 PLP
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C4C6- AA TAX
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C4C7- 0A ASL
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C4C8- 0A ASL
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C4C9- 0A ASL
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C4CA- 0A ASL
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C4CB- A8 TAY
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C4CC- A9 03 LDA #$03
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C4CE- 18 CLC
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C4CF- 90 A8 BCC $C479 ; always branches
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... but the version below is patched so it uses soft switches to call
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back here.
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SETMOUSE:
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C471- 8D CF C0 STA $C0CF ; use soft switch 0xF to handle it
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60 RTS
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Patch: C471 from 99 82 C0 60 => 8D CF C0 60
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SERVEMOUSE @ $C4B2:
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78 SEI
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AD CE C0 LDA $C0CE ; use soft switch 0xE (read) to trigger this - expect new value to be placed in $7f8+4 and $6b8+4
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A2 04 LDX #$04 ; our slot number, for cleanup code
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18 CLC
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90 C1 BCC $C47C
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Patch: C4B2 from 08 A5 00 48 A9 60 85 00 78 =>
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78 AD CE C0 A2 04 18 90 C1
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READMOUSE
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C48E- AD CB C0 LDA $C0CB ; soft switch 0x0B for readmouse
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18 CLC
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60 RTS
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Patch: from A9 04 99 83 C0 =>
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AD CB C0 18 60
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CLEARMOUSE
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C49F- AD CA C0 LDA $C0CA ; soft switch 0x0A for clearmouse
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18 CLC
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60 RTS
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Patch: from EA A9 05 D0 F6 =>
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AD CA C0 18 60
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POSMOUSE
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C4a4- AD C9 C0 LDA $C0C9 ; soft switch 0x09 for posmouse
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18 CLC
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60 RTS
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Patch: from EA A9 06 D0 F1 =>
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AD C9 C0 18 60
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CLAMPMOUSE
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C48A- 8D CD C0 STA $C04D ; use write to soft switch 0x0D to trigger clamp
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60 RTS
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Patch: from 99 83 C0 60 => 8D CD C0 60
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HOMEMOUSE
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C4A9- AD C8 C0 LDA $c048 ; soft switch 0x08 for homemouse (read)
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18 CLC
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60 RTS
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Patch: from EA A9 07 D0 EC => AD C8 C0 18 60
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INITMOUSE
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C498- AD CC C0 LDA $C04C ; soft switch 0x0C read for initmouse
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18 CLC
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60 RTS
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Patch: from A9 02 99 83 C0 => AD CC C0 18 60
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*/
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uint8_t rom[256] = { 0x2c, 0x58, 0xff, 0x70, 0x1B, 0x38, 0x90, 0x18, // C400
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0xb8, 0x50, 0x15, 0x01, 0x20, 0x8d, 0x8d, 0x8d,
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0x8d, 0x00, 0x60, 0x68, 0x76, 0x7b, 0x80, 0x85, // C410
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0x8f, 0x94, 0x8d, 0x8d, 0x8d, 0x8d, 0x8d, 0x8d,
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0x48, 0x98, 0x48, 0x8a, 0x48, 0x08, 0x78, 0x20, // C420
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0x58, 0xFF, 0xBA, 0xBD, 0x00, 0x01, 0xAA, 0x0A,
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0x0A, 0x0A, 0x0A, 0xA8, 0x28, 0x50, 0x0F, 0xA5, // C430
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0x38, 0xd0, 0x0d, 0x8a, 0x45, 0x39, 0xd0, 0x08,
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0xa9, 0x05, 0x85, 0x38, 0xd0, 0x0b, 0xb0, 0x09, // C440
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0x68, 0xaa, 0x68, 0xea, 0x68, 0xea, 0xea, 0xea,
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0x60, 0xea, 0xea, 0xea, 0x68, 0xbd, 0x38, 0x06, // C450
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0xaa, 0x68, 0xa8, 0x68, 0xbd, 0x00, 0x02, 0x60,
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0xc9, 0x10, 0xb0, 0x29, 0x8d, 0xcf, 0xc0, 0x60, // C460
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0x48, 0x18, 0x90, 0x2d, 0xbd, 0xb8, 0x06, 0x29,
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0x0e, 0xd0, 0x01, 0x38, 0x68, 0x60, 0x8d, 0xcb, // C470
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0xc0, 0x18, 0x60, 0x8d, 0xca, 0xc0, 0x18, 0x60,
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0x8d, 0xc9, 0xc0, 0x18, 0x60, 0xc9, 0x02, 0xb0, // C480
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0x04, 0x8d, 0xcd, 0xc0, 0x60, 0x38, 0x60, 0x8d,
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0xc8, 0xc0, 0x18, 0x60, 0x8d, 0xcc, 0xc0, 0x18, // C490
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0x60, 0x78, 0x8d, 0xce, 0xc0, 0xa2, 0x04, 0x18,
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0x90, 0xCA, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // C4A0
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, // C4B0
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, // C4C0
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, // C4D0
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, // C4E0
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, // C4F0
|
|
0xff, 0xff, 0xff, 0xd6, 0xff, 0xff, 0xff, 0x01 };
|
|
memcpy(toWhere, rom, 256);
|
|
}
|
|
|
|
bool Mouse::hasExtendedRom()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
void Mouse::loadExtendedRom(uint8_t *toWhere, uint16_t byteOffset)
|
|
{
|
|
#if 0
|
|
printf("loading extended rom for the mouse\n");
|
|
for (int i=0; i<256; i++) {
|
|
toWhere[i] = romData[i + byteOffset];
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void Mouse::maintainMouse(int64_t cycleCount)
|
|
{
|
|
// static int64_t startTime = cycleCount;
|
|
|
|
// Fake a 60Hz VBL in case we need it for our interrupts
|
|
static int64_t nextInterruptTime = cycleCount + 17050;
|
|
|
|
if ( (status & ST_MOUSEENABLE) &&
|
|
(status & ST_INTVBL) &&
|
|
(cycleCount >= nextInterruptTime) ) {
|
|
g_cpu->irq();
|
|
|
|
interruptsTriggered |= ST_INTVBL;
|
|
|
|
nextInterruptTime += 17050;
|
|
} else {
|
|
uint16_t xpos, ypos;
|
|
g_mouse->getPosition(&xpos, &ypos);
|
|
|
|
if ( (status & ST_MOUSEENABLE) &&
|
|
(status & ST_INTMOUSE) &&
|
|
(xpos != lastX || ypos != lastY) ) {
|
|
g_cpu->irq();
|
|
|
|
interruptsTriggered |= ST_INTMOUSE;
|
|
lastX = xpos; lastY = ypos;
|
|
}
|
|
}
|
|
/* FIXME: still need button */
|
|
}
|