source: buchla-emu/emu/ser.c@ ac4e192

Last change on this file since ac4e192 was 0edef06, checked in by Thomas Lopatic <thomas@…>, 7 years ago

Configurable font file.
  • Property mode set to 100644
File size: 7.3 KB
Line 
1/*
2 * Copyright (C) 2017 The Contributors
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or (at
7 * your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * A copy of the GNU General Public License can be found in the file
15 * "gpl.txt" in the top directory of this repository.
16 */
17
18#include <all.h>
19
20#define ver(...) _ver(ser_verbose, 0, __VA_ARGS__)
21#define ver2(...) _ver(ser_verbose, 1, __VA_ARGS__)
22#define ver3(...) _ver(ser_verbose, 2, __VA_ARGS__)
23
24int32_t ser_verbose = 0;
25
26#define WIN_W (1520 * 2 / 3)
27#define WIN_H (950 * 2 / 3)
28
29#define BEL_CYC 10000
30
31#define CON_W 80
32#define CON_H 25
33
34#define CON_BGR 0x00000000
35#define CON_BEL 0x00808080
36#define CON_CUR 0x00e87000
37#define CON_FGR ((SDL_Color){ .r = 255, .b = 255, .g = 255, .a = 255 })
38
39#define REG_IER_ISR 0
40#define REG_CFR_SR 1
41#define REG_CDR_TBR 2
42#define REG_TDR_RDR 3
43
44typedef struct {
45 bool irq_r;
46 bool irq_t;
47 bool rdr_ok;
48 uint8_t rdr;
49} state_t;
50
51static state_t state[] = {
52 { .irq_r = false, .irq_t = false, .rdr_ok = false, .rdr = 0x00 },
53 { .irq_r = false, .irq_t = false, .rdr_ok = false, .rdr = 0x00 }
54};
55
56static uint8_t mem[CON_H][CON_W + 1];
57
58static SDL_Window *win;
59static SDL_Renderer *ren;
60static SDL_atomic_t frame;
61
62static TTF_Font *fon;
63static int32_t fon_w, fon_h;
64
65static int32_t sur_w, sur_h;
66static SDL_Surface *sur;
67
68static int32_t cur_x = 0, cur_y = 0;
69static int32_t bel = 0;
70
71static void scroll(void)
72{
73 memmove(mem, mem + 1, (CON_H - 1) * (CON_W + 1));
74 memset(mem + (CON_H - 1), ' ', CON_W);
75}
76
77static void forw(void)
78{
79 if (cur_x < CON_W - 1) {
80 ++cur_x;
81 return;
82 }
83
84 if (cur_y == CON_H - 1) {
85 cur_x = 0;
86 scroll();
87 return;
88 }
89
90 cur_x = 0;
91 ++cur_y;
92}
93
94static void back(void)
95{
96 if (cur_x > 0) {
97 --cur_x;
98 return;
99 }
100
101 if (cur_y == 0) {
102 return;
103 }
104
105 cur_x = CON_W - 1;
106 --cur_y;
107}
108
109static void down(void)
110{
111 if (cur_y < CON_H - 1) {
112 ++cur_y;
113 return;
114 }
115
116 scroll();
117}
118
119static void echo(uint8_t c)
120{
121 if (c < 32) {
122 switch (c) {
123 case '\r':
124 cur_x = 0;
125 break;
126
127 case '\n':
128 down();
129 break;
130
131 case '\b':
132 back();
133 break;
134
135 case '\a':
136 bel = BEL_CYC;
137 break;
138
139 default:
140 echo('^');
141 echo((uint8_t)(c + '@'));
142 return;
143 }
144 }
145 else {
146 mem[cur_y][cur_x] = c;
147 forw();
148 }
149
150 SDL_AtomicAdd(&frame, 1);
151}
152
153static void out(int32_t un, uint8_t c)
154{
155 if (SDL_LockMutex(cpu_mutex) < 0) {
156 fail("SDL_LockMutex() failed: %s", SDL_GetError());
157 }
158
159 state[un].rdr = c;
160 state[un].rdr_ok = true;
161 state[un].irq_r = true;
162
163 if (SDL_UnlockMutex(cpu_mutex) < 0) {
164 fail("SDL_UnlockMutex() failed: %s", SDL_GetError());
165 }
166}
167
168void ser_sdl(void)
169{
170 ver3("ser_sdl()");
171
172 static int32_t last = 0;
173 int32_t now = SDL_AtomicGet(&frame);
174
175 if (last == now) {
176 ver3("no update");
177 return;
178 }
179
180 last = now;
181
182 if (SDL_FillRect(sur, NULL, bel == 0 ? CON_BGR : CON_BEL) < 0) {
183 fail("SDL_FillRect() failed: %s", SDL_GetError());
184 }
185
186 if (SDL_FillRect(sur, &(SDL_Rect){
187 .x = cur_x * fon_w,
188 .y = cur_y * fon_h,
189 .w = fon_w,
190 .h = fon_h
191 }, CON_CUR) < 0) {
192 fail("SDL_FillRect() failed: %s", SDL_GetError());
193 }
194
195 for (int32_t y = 0; y < CON_H; ++y) {
196 char line[CON_W + 1];
197
198 if (SDL_LockMutex(cpu_mutex) < 0) {
199 fail("SDL_LockMutex() failed: %s", SDL_GetError());
200 }
201
202 memcpy(line, mem[y], CON_W + 1);
203
204 if (SDL_UnlockMutex(cpu_mutex) < 0) {
205 fail("SDL_UnlockMutex() failed: %s", SDL_GetError());
206 }
207
208 SDL_Surface *lin = TTF_RenderText_Blended(fon, line, CON_FGR);
209
210 if (lin == NULL) {
211 fail("TTF_RenderText_Blended() failed: %s", TTF_GetError());
212 }
213
214 if (SDL_BlitSurface(lin, NULL, sur, &(SDL_Rect){
215 .x = 0,
216 .y = y * fon_h,
217 .w = CON_W * fon_w,
218 .h = fon_h
219 })) {
220 fail("SDL_BlitSurface() failed: %s", SDL_GetError());
221 }
222
223 SDL_FreeSurface(lin);
224 }
225
226 SDL_Texture *tex = SDL_CreateTextureFromSurface(ren, sur);
227
228 if (tex == NULL) {
229 fail("SDL_CreateTextureFromSurface() failed: %s", SDL_GetError());
230 }
231
232 if (SDL_RenderCopy(ren, tex, NULL, NULL) < 0) {
233 fail("SDL_RenderCopy() failed: %s", SDL_GetError());
234 }
235
236 SDL_DestroyTexture(tex);
237 SDL_RenderPresent(ren);
238}
239
240void ser_key(SDL_KeyboardEvent *ev)
241{
242 switch (ev->keysym.sym) {
243 case SDLK_BACKSPACE:
244 out(1, '\b');
245 break;
246
247 case SDLK_RETURN:
248 out(1, '\r');
249 break;
250
251 default:
252 if ((ev->keysym.mod & KMOD_CTRL) != 0 &&
253 ev->keysym.sym >= SDLK_a && ev->keysym.sym <= SDLK_z) {
254 out(1, (uint8_t)(ev->keysym.sym - SDLK_a + 1));
255 }
256
257 break;
258 }
259}
260
261void ser_text(SDL_TextInputEvent *ev)
262{
263 for (int32_t i = 0; ev->text[i] != 0; ++i) {
264 out(1, (uint8_t)ev->text[i]);
265 }
266}
267
268void ser_init(void)
269{
270 ver("ser init");
271
272 win = SDL_CreateWindow("Serial Console", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
273 WIN_W, WIN_H, 0);
274
275 if (win == NULL) {
276 fail("SDL_CreateWindow() failed: %s", SDL_GetError());
277 }
278
279 ren = SDL_CreateRenderer(win, -1, 0);
280
281 if (ren == NULL) {
282 fail("SDL_CreateRenderer() failed: %s", SDL_GetError());
283 }
284
285 SDL_AtomicSet(&frame, 1);
286
287 SDL_RWops *ops = SDL_RWFromFile(font, "rb");
288
289 if (ops == NULL) {
290 fail("error while opening font file %s: %s", font, SDL_GetError());
291 }
292
293 fon = TTF_OpenFontRW(ops, 1, 32);
294
295 if (fon == NULL) {
296 fail("error while loading font file %s: %s", font, TTF_GetError());
297 }
298
299 fon_h = TTF_FontLineSkip(fon);
300
301 if (TTF_GlyphMetrics(fon, 'X', NULL, NULL, NULL, NULL, &fon_w) < 0) {
302 fail("error while measuring font width: %s", TTF_GetError());
303 }
304
305 sur_w = CON_W * fon_w;
306 sur_h = CON_H * fon_h;
307
308 sur = SDL_CreateRGBSurface(0, sur_w, sur_h, 32, 0, 0, 0, 0);
309
310 if (sur == NULL) {
311 fail("SDL_CreateRGBSurface() failed: %s", SDL_GetError());
312 }
313
314 for (int32_t y = 0; y < CON_H; ++y) {
315 for (int32_t x = 0; x < CON_W; ++x) {
316 mem[y][x] = ' ';
317 }
318
319 mem[y][CON_W] = 0;
320 }
321}
322
323void ser_quit(void)
324{
325 ver("ser quit");
326
327 SDL_FreeSurface(sur);
328 TTF_CloseFont(fon);
329
330 SDL_DestroyRenderer(ren);
331 SDL_DestroyWindow(win);
332}
333
334bool ser_exec(void)
335{
336 ver3("ser exec");
337
338 if (bel > 0) {
339 --bel;
340
341 if (bel == BEL_CYC - 1 || bel == 0) {
342 SDL_AtomicAdd(&frame, 1);
343 }
344 }
345
346 return state[0].irq_r || state[0].irq_t || state[1].irq_r || state[1].irq_t;
347}
348
349uint32_t ser_read(uint32_t off, int32_t sz)
350{
351 ver2("ser rd %u:%d", off, sz * 8);
352
353 if (sz != 1 || off > 7) {
354 fail("invalid ser rd %u:%d", off, sz * 8);
355 }
356
357 int32_t rg = (int32_t)(off % 4);
358 int32_t un = (int32_t)(off / 4);
359
360 uint32_t rv;
361
362 switch (rg) {
363 case REG_IER_ISR:
364 rv = (uint32_t)(0xc0 | (state[un].rdr_ok ? 0x01 : 0x00));
365 state[un].irq_r = false;
366 state[un].irq_t = false;
367 ver2("ISR[%d] 0x%02x", un, rv);
368 break;
369
370 case REG_TDR_RDR:
371 rv = state[un].rdr;
372 state[un].rdr_ok = false;
373 ver2("RDR[%d] 0x%02x", un, rv);
374 break;
375
376 default:
377 rv = 0x00;
378 break;
379 }
380
381 return rv;
382}
383
384void ser_write(uint32_t off, int32_t sz, uint32_t val)
385{
386 ver2("ser wr %u:%d 0x%0*x", off, sz * 8, sz * 2, val);
387
388 if (sz != 1 || off > 7) {
389 fail("invalid ser wr %u:%d", off, sz * 8);
390 }
391
392 int32_t rg = (int32_t)(off % 4);
393 int32_t un = (int32_t)(off / 4);
394
395 switch (rg) {
396 case REG_TDR_RDR:
397 ver2("TDR[%d] 0x%02x", un, val);
398 echo((uint8_t)val);
399 state[un].irq_t = true;
400 break;
401
402 default:
403 break;
404 }
405}
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