mirror of
https://github.com/st3fan/ewm.git
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120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
// The MIT License (MIT)
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//
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// Copyright (c) 2015 Stefan Arentz - http://github.com/st3fan/ewm
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <curses.h>
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#include "cpu.h"
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#include "pia.h"
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static void pia_dsp_write(uint8_t b) {
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//fprintf(stderr, "PIA: Sending to display: %.2x / %.2x\n", b, b & 0x7f);
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b &= 0b01111111;
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if (b == '\r') {
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b = '\n';
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}
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addch(b);
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refresh();
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}
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/* static int pia_kbd_read() { */
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/* int c = getch(); */
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/* } */
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/* static uint8_t pia_kbd_read() { */
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/* return getchar(); */
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/* } */
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void pia_init(struct pia_t *pia) {
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initscr();
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raw();
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noecho();
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pia->a = 0;
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pia->cra = 0;
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pia->b = 0;
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pia->crb = 0;
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}
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void pia_trace(struct pia_t *pia, uint8_t trace) {
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pia->trace = trace;
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}
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uint8_t pia_read(struct cpu_t *cpu, struct mem_t *mem, uint16_t addr) {
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struct pia_t *pia = (struct pia_t*) mem->obj;
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uint8_t result = 0;
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switch (addr) {
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case 0xd010: /* KBD */
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result = pia->a;
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break;
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case 0xd011: /* KBDCR */ {
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int c = getch();
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if (c != ERR) {
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/* TODO: Remove this, this is not how we want to stop the emulator */
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if (c == 3) {
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exit(1);
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}
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if (c == '\n') {
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c = '\r';
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}
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pia->a = c | 0x80;
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}
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result = (c == ERR) ? 0x00 : 0x80;
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break;
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}
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case 0xd012: /* DSP */
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result = 0;
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break;
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case 0xd013: /* DSPCR */
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result = 0;
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break;
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}
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if (pia->trace) {
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fprintf(stderr, "PIA: READ BYTE %.2X FROM %.4X\n", result, addr);
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}
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return result;
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}
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void pia_write(struct cpu_t *cpu, struct mem_t *mem, uint16_t addr, uint8_t b) {
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struct pia_t *pia = (struct pia_t*) mem->obj;
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if (pia->trace) {
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fprintf(stderr, "PIA: WRITING BYTE %.2X TO %.4X\n", b, addr);
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}
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switch (addr) {
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case 0xd010: /* KBD */
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break;
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case 0xd011: /* KBDCR */
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pia->cra = b;
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break;
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case 0xd012: /* DSP */
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if (pia->crb != 0x00) { /* TODO: Check the actual flag */
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pia_dsp_write(b);
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}
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break;
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case 0xd013: /* DSPCR */
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pia->crb = b;
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break;
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}
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}
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