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https://github.com/buserror/mii_emu.git
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d53b0bceff
It is limited for now, hard coded to mine. Still need some sort of way to specify which button to map to the emulated joytick. Same with the axis, currently default to 0,1 Signed-off-by: Michel Pollet <buserror@gmail.com>
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/*
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* mii_analog.c
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*
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* Copyright (C) 2023 Michel Pollet <buserror@gmail.com>
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*
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* SPDX-License-Identifier: MIT
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include "mii.h"
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#include "mii_analog.h"
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void
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mii_analog_init(
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struct mii_t *mii,
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mii_analog_t * a )
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{
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memset(a, 0, sizeof(*a));
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}
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/*
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* https://retrocomputing.stackexchange.com/questions/15093/how-do-i-read-the-position-of-an-apple-ii-joystick
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*/
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void
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mii_analog_access(
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mii_t *mii,
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mii_analog_t * a,
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uint16_t addr,
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uint8_t * byte,
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bool write)
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{
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if (write)
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return;
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switch (addr) {
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case 0xc070: {
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// multiplying by mii->speed allows reading joystick in 'fast' mode,
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// this basically simulate slowing down just for the joystick reading
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/* TODO: According to various artivles, the multiplier ought
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* to be 11, but we're not making the count here, which means it's
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* likely the emulated core is missing a cycle for one instruction
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* somewhere... */
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for (int i = 0; i < 4; i++) {
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a->v[i].decay = mii->cycles +
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((a->v[i].value * 10.10) * mii->speed);
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// printf("joystick %d: %d\n", i, a->v[i].value);
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}
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} break;
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case 0xc064 ... 0xc067: {
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addr -= 0xc064;
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*byte = mii->cycles <= a->v[addr].decay ? 0x80 : 0x00;
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} break;
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}
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}
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