]> cloudbase.mooo.com Git - z180-stamp.git/blob - avr/z180-serv.c
projects / z180-stamp.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
attach option: ro; do_msg_cpm_rw(): check status
[z180-stamp.git] / avr / z180-serv.c
1 /*
2 * (C) Copyright 2014-2016 Leo C. <erbl259-lmu@yahoo.de>
3 *
4 * SPDX-License-Identifier: GPL-2.0
5 */
6
7 #include "z180-serv.h"
8 #include "common.h"
9 #include <stdlib.h>
10 #include <string.h>
11 #include <stdbool.h>
12 #include <util/atomic.h>
13
14 #include "config.h"
15 #include "background.h"
16 #include "env.h"
17 #include "ff.h"
18 #include "serial.h"
19 #include "z80-if.h"
20 #include "debug.h"
21 #include "print-utils.h"
22 #include "timer.h"
23 #include "time.h"
24 #include "bcd.h"
25 #include "rtc.h"
26
27 #define DEBUG_CPM_SDIO 1 /* set to 1 to debug */
28
29 #define debug_cpmsd(fmt, args...) \
30 debug_cond(DEBUG_CPM_SDIO, fmt, ##args)
31
32
33 /*--------------------------------------------------------------------------*/
34
35 struct msg_item {
36 uint8_t fct;
37 uint8_t sub_min, sub_max;
38 void (*func)(uint8_t, int, uint8_t *);
39 };
40
41 uint32_t msg_to_addr(uint8_t *msg)
42 {
43 union {
44 uint32_t as32;
45 uint8_t as8[4];
46 } addr;
47
48 addr.as8[0] = msg[0];
49 addr.as8[1] = msg[1];
50 addr.as8[2] = msg[2];
51 addr.as8[3] = 0;
52
53 return addr.as32;
54 }
55
56
57 static int msg_xmit_header(uint8_t func, uint8_t subf, int len)
58 {
59 z80_memfifo_putc(fifo_msgout, 0xAE);
60 z80_memfifo_putc(fifo_msgout, len+2);
61 z80_memfifo_putc(fifo_msgout, func);
62 z80_memfifo_putc(fifo_msgout, subf);
63
64 return 0;
65 }
66
67 int msg_xmit(uint8_t func, uint8_t subf, int len, uint8_t *msg)
68 {
69 msg_xmit_header(func, subf, len);
70 while (len--)
71 z80_memfifo_putc(fifo_msgout, *msg++);
72
73 return 0;
74 }
75
76 void do_msg_ini_memfifo(uint8_t subf, int len, uint8_t * msg)
77 {
78 (void)len;
79
80 z80_memfifo_init(subf, msg_to_addr(msg));
81 }
82
83
84 void do_msg_char_out(uint8_t subf, int len, uint8_t * msg)
85 {
86 (void)subf;
87
88 while (len--)
89 putchar(*msg++);
90 }
91
92 /* echo message */
93 void do_msg_echo(uint8_t subf, int len, uint8_t * msg)
94 {
95 (void)subf;
96
97 /* send re-echo */
98 msg_xmit(1, 3, len, msg);
99 }
100
101 /* get timer */
102 void do_msg_get_timer(uint8_t subf, int len, uint8_t * msg)
103 {
104 uint32_t time_ms = (len >= 4) ? *(uint32_t *) msg : 0;
105
106 time_ms = get_timer(time_ms);
107 msg_xmit(3, subf, sizeof(time_ms), (uint8_t *) &time_ms);
108 }
109
110 /* ---------------------------------------------------------------------------*/
111
112 #define CPM_DAY_OFFSET ((1978-1900) * 365 + 19) /* 19 leap years */
113
114 /*
115 * Convert CP/M time stamp to a broken-down time structure
116 *
117 */
118 int mk_date_time (int len, uint8_t *msg, struct tm *tmp)
119 {
120 time_t stamp;
121
122 if (len != 5)
123 return -1;
124
125 /* days since 2000-01-01 */
126 long days = msg[3] + (msg[4] << 8) - 8036;
127
128 if (days < 0)
129 return -1;
130
131 stamp = days * ONE_DAY;
132 stamp += bcd2bin(msg[0]);
133 stamp += bcd2bin(msg[1]) * 60 ;
134 stamp += bcd2bin(msg[2]) * 3600L;
135 gmtime_r(&stamp, tmp);
136 return 0;
137 }
138
139 void mk_cpm_time(struct tm *tmp, uint8_t cpm_time[5])
140 {
141 uint16_t days = 1;
142 uint_fast8_t leap=2;
143
144 for (int year=78; year < tmp->tm_year; year++) {
145 days = days + 365 + (leap == 0);
146 leap = (leap+1)%4;
147 }
148 days += tmp->tm_yday;
149
150 cpm_time[0] = bin2bcd(tmp->tm_sec);
151 cpm_time[1] = bin2bcd(tmp->tm_min);
152 cpm_time[2] = bin2bcd(tmp->tm_hour);
153 cpm_time[3] = days;
154 cpm_time[4] = days >> 8;
155 }
156
157 /* get/set cp/m time */
158 void do_msg_get_set_time(uint8_t subf, int len, uint8_t * msg)
159 {
160 struct tm t;
161 uint8_t cpm_time[5];
162 int rc;
163
164 memset(cpm_time, 0, ARRAY_SIZE(cpm_time));
165
166 switch (subf) {
167 case 3: /* set date & time */
168 /* initialize t with current time */
169 rc = rtc_get (&t);
170
171 if (rc >= 0) {
172 /* insert new date & time */
173 if (mk_date_time (len, msg, &t) != 0) {
174 my_puts_P(PSTR("## set_time: Bad date format\n"));
175 break;
176 }
177
178 time_t time;
179 time = mk_gmtime(&t);
180 gmtime_r(&time, &t);
181
182 /* and write to RTC */
183 rc = rtc_set (&t);
184 if(rc)
185 my_puts_P(PSTR("## set_time: Set date failed\n"));
186 } else {
187 my_puts_P(PSTR("## set_time: Get date failed\n"));
188 }
189 /* FALL TROUGH */
190 case 2: /* get date & time */
191 rc = rtc_get (&t);
192 if (rc >= 0) {
193 time_t time;
194 time = mk_gmtime(&t);
195 //mktime(&t);
196 gmtime_r(&time, &t);
197
198 mk_cpm_time(&t, cpm_time);
199 } else {
200 my_puts_P(PSTR("## get_time: Get date failed\n"));
201 }
202 break;
203 }
204
205 msg_xmit(3, subf, sizeof(cpm_time), cpm_time);
206 }
207
208 /* ---------------------------------------------------------------------------*/
209
210 static uint8_t disk_buffer[CONFIG_CPM_BLOCK_SIZE];
211 static struct cpm_drive_s drv_table[CONFIG_CPM_MAX_DRIVE];
212 static int handle_cpm_drv_to;
213
214
215 int drv_list(void)
216 {
217 for (uint8_t i = 0; i < CONFIG_CPM_MAX_DRIVE; i++) {
218 struct cpm_drive_s * p = &drv_table[i];
219 if (p->img_name) {
220 printf_P(PSTR(" dsk%d: %2s %3s attached to %s\n"), i,
221 p->opt&DRV_OPT_RO ? "RO":"RW", p->opt&DRV_OPT_DEBUG ? "DBG":"",
222 p->img_name);
223 }
224 }
225 return 0;
226 }
227
228 int drv_detach(uint8_t drv)
229 {
230 if (drv < CONFIG_CPM_MAX_DRIVE) {
231 struct cpm_drive_s *p = &drv_table[drv];
232
233 debug_cpmsd("## detach dsk%d: %s\n", drv,
234 p->img_name ? p->img_name : "-");
235
236 if (p->img_name) {
237 f_close(&p->fd);
238 free(p->img_name);
239 p->opt = 0;
240 p->flags &= ~DRV_FLG_DIRTY;
241 p->img_name = NULL;
242 }
243 }
244 return 0;
245 }
246
247 static int drv_find_file_attached(const char *fn)
248 {
249 for (uint8_t i = 0; i < CONFIG_CPM_MAX_DRIVE; i++) {
250 struct cpm_drive_s *p = &drv_table[i];
251 if (p->img_name && !strcmp(fn, p->img_name)) {
252 return i;
253 }
254 }
255 return -1;
256 }
257
258 int drv_attach(uint8_t drv, const char *filename, drv_opt_t options)
259 {
260 int res;
261
262 if (drv >= CONFIG_CPM_MAX_DRIVE)
263 return AT_RANGE;
264
265 struct cpm_drive_s *p = &drv_table[drv];
266
267 if (options & DRV_OPT_REATTATCH) {
268 if (filename) {
269 return AT_ERROR;
270 }
271
272 if (!p->img_name) {
273 return AT_NOT;
274 }
275
276 /* change options */
277 if ((p->opt ^ options) & DRV_OPT_RO) {
278 f_close(&p->fd);
279 res = f_open(&p->fd, p->img_name,
280 FA_READ | (options&DRV_OPT_RO ? 0 : FA_WRITE));
281 }
282
283 p->opt = options & ~DRV_OPT_REATTATCH;
284
285 } else {
286
287 if (p->img_name)
288 return AT_ALREADY;
289 if (drv_find_file_attached(filename) >= 0)
290 return AT_OTHER;
291
292 p->opt = options;
293
294 /* new attachment */
295
296 if ((p->img_name = strdup(filename)) == NULL)
297 return AT_NOMEM;
298
299 res = f_open(&p->fd, p->img_name,
300 FA_READ | (options&DRV_OPT_RO ? 0 : FA_WRITE));
301
302 if (!res && f_size(&p->fd) < CONFIG_CPM_DISKSIZE) {
303 #if 0
304 unsigned int bw;
305 debug_cpmsd(" expanding image file from %ld to %ld\n",
306 f_size(&p->fd), CONFIG_CPM_DISKSIZE);
307
308 res = f_lseek(&p->fd, CONFIG_CPM_DISKSIZE-CONFIG_CPM_BLOCK_SIZE);
309 if (!res) {
310 memset(disk_buffer, 0xe5, CONFIG_CPM_BLOCK_SIZE);
311 res = f_write(&p->fd, disk_buffer, CONFIG_CPM_BLOCK_SIZE, &bw);
312 if (res || bw < CONFIG_CPM_BLOCK_SIZE) {
313 debug_cpmsd(" failed! res: %d, bytes written: %u\n", res, bw);
314 }
315 p->flags |= DRV_FLG_DIRTY;
316 bg_setstat(handle_cpm_drv_to, 1);
317 }
318 #else
319 debug_cpmsd(" wrong image file zize: %ld, should be %ld\n",
320 f_size(&p->fd), CONFIG_CPM_DISKSIZE);
321 res = 64;
322 #endif
323 }
324 if (res) {
325 drv_detach(drv);
326 return AT_OPEN;
327 }
328 }
329
330 return AT_OK;
331 }
332
333
334 int cpm_drv_to(int state)
335 {
336 static uint32_t ts;
337
338 switch(state) {
339 case 0:
340 break;
341
342 case 1:
343 ts = get_timer(0);
344 state = 2;
345 break;
346
347 case 2:
348 if (get_timer(ts) > 1000) {
349 for (uint_fast8_t i=0; i < CONFIG_CPM_MAX_DRIVE; i++) {
350 if (drv_table[i].flags & DRV_FLG_DIRTY) {
351 f_sync(&drv_table[i].fd);
352 drv_table[i].flags &= ~DRV_FLG_DIRTY;
353 debug_cpmsd("## %7lu f_sync: %c:\n", get_timer(0), i + CONFIG_CPM_BASE_DRIVE);
354 }
355 }
356 state = 0;
357 }
358 }
359 return state;
360 }
361
362
363 void msg_cpm_result(uint8_t subf, uint8_t rc, int res)
364 {
365 uint8_t result_msg[3];
366
367 if (res)
368 rc |= 0x80;
369
370 result_msg[0] = rc;
371 result_msg[1] = res;
372 result_msg[2] = res >> 8;
373
374 if (rc) {
375 debug_cpmsd("###%7lu error rc: %.02x, res: %d\n", get_timer(0), rc, res);
376 }
377
378 msg_xmit(2, subf, sizeof(result_msg), result_msg);
379 }
380
381 /*
382 db 2 ; disk command
383 ds 1 ; subcommand (login/read/write)
384 ds 1 ; @adrv (8 bits) +0
385 ds 1 ; @rdrv (8 bits) +1
386 ds 3 ; @xdph (24 bits) +2
387 */
388
389 void do_msg_cpm_login(uint8_t subf, int len, uint8_t * msg)
390 {
391 uint8_t drv;
392 struct cpm_drive_s *dp;
393 FRESULT res = 0;
394
395 (void)subf;
396
397 if (len != 5) {
398 return msg_cpm_result(subf, 0x01, res);
399 }
400
401 debug_cpmsd("\n## %7lu login: %c:\n", get_timer(0), msg[1]+CONFIG_CPM_BASE_DRIVE);
402
403 /* Get relative drive number */
404 drv = msg[1];
405 if ( drv >= CONFIG_CPM_MAX_DRIVE) {
406 debug_cpmsd("## failed: invalid relative drive number '%d'\n", drv);
407 return msg_cpm_result(subf, 0x02, res);
408 }
409
410 dp = &drv_table[drv];
411 dp->flags &= ~DRV_FLG_OPEN;
412 dp->dph = ((uint32_t)msg[4] << 16) + ((uint16_t)msg[3] << 8) + msg[2];
413
414
415 if (dp->img_name == NULL) {
416 /* no file attached */
417 debug_cpmsd("## failed: no file attached:\n");
418 return msg_cpm_result(subf, 0x03, res);
419 }
420
421 dp->flags |= DRV_FLG_OPEN;
422
423 /* send result*/
424 msg_cpm_result(subf, 0x00, res);
425 }
426
427
428 /*
429 db 2 ; disk command
430 ds 1 ; subcommand (login/read/write)
431 ds 1 ; @adrv (8 bits) +0
432 ds 1 ; @rdrv (8 bits) +1
433 ds 2 ; @trk (16 bits) +2
434 ds 2 ; @sect(16 bits) +4
435 ds 1 ; @cnt (8 bits) +6
436 ds 3 ; phys. transfer addr +7
437 */
438
439 #define ADRV 0
440 #define RDRV 1
441 #define TRK 2
442 #define SEC 4
443 #define CNT 6
444 #define ADDR 7
445
446 void do_msg_cpm_rw(uint8_t subf, int len, uint8_t * msg)
447 {
448 uint8_t drv;
449 struct cpm_drive_s *dp;
450 uint32_t addr;
451 uint32_t pos;
452 uint8_t secs;
453 bool dowrite;
454 FRESULT res = 0;
455 uint8_t rc = 0;
456 bool buserr = 0;
457
458 if (len != 10) {
459 return msg_cpm_result(subf, 0x01, res);
460 }
461
462 drv = msg[RDRV];
463 if ( drv>= CONFIG_CPM_MAX_DRIVE) {
464 return msg_cpm_result(subf, 0x02, res);
465 }
466
467 dp = &drv_table[drv];
468
469 if (dp->img_name == NULL) {
470 /* no media */
471 return msg_cpm_result(subf, 0x06, res);
472 }
473
474 if (subf == 2) {
475 dowrite = true;
476 if (dp->opt & DRV_OPT_RO) {
477 return msg_cpm_result(subf, 0x05, res);
478 }
479 } else {
480 dowrite = false;
481 }
482
483 secs = msg[CNT];
484 addr = ((uint32_t)msg[ADDR+2] << 16) + ((uint16_t)msg[ADDR+1] << 8) + msg[ADDR];
485
486
487 /* TODO: tracks per sector from dpb */
488 pos = (((uint16_t)(msg[TRK+1] << 8) + msg[TRK]) * 8
489 + ((uint32_t)(msg[SEC+1] << 8) + msg[SEC])) * CONFIG_CPM_BLOCK_SIZE;
490
491 debug_cpmsd("## %7lu cpm_rw: %s %c: trk:%4d, sec: %d, pos: %.8lx, secs: %2d, "
492 "addr: %.5lx\n", get_timer(0), dowrite ? "write" : " read",
493 msg[RDRV]+CONFIG_CPM_BASE_DRIVE,
494 ((uint16_t)(msg[TRK+1] << 8) + msg[TRK]), msg[SEC], pos, msg[CNT], addr);
495
496 if (pos + secs * CONFIG_CPM_BLOCK_SIZE > CONFIG_CPM_DISKSIZE) {
497 debug_cpmsd(" access > DISKSIZE (%.8lx > %.8lx) aborted!\n",
498 pos + secs * CONFIG_CPM_BLOCK_SIZE, CONFIG_CPM_DISKSIZE);
499 return msg_cpm_result(subf, 0x04, res);
500 }
501
502 res = f_lseek(&dp->fd, pos);
503
504 while (!res && secs--) {
505 unsigned int brw;
506 if (dowrite) {
507 if (!(z80_bus_cmd(Request) & ZST_ACQUIRED)) {
508 buserr = 1;
509 break;
510 } else {
511 z80_read_block(disk_buffer, addr, CONFIG_CPM_BLOCK_SIZE);
512 z80_bus_cmd(Release);
513 }
514 res = f_write(&dp->fd, disk_buffer, CONFIG_CPM_BLOCK_SIZE, &brw);
515 } else {
516 res = f_read(&dp->fd, disk_buffer, CONFIG_CPM_BLOCK_SIZE, &brw);
517 if (res == FR_OK) {
518 if (!(z80_bus_cmd(Request) & ZST_ACQUIRED)) {
519 buserr = 1;
520 break;
521 } else {
522 z80_write_block(disk_buffer, addr, CONFIG_CPM_BLOCK_SIZE);
523 z80_bus_cmd(Release);
524 }
525 }
526 }
527 if (brw != CONFIG_CPM_BLOCK_SIZE) {
528 debug_cpmsd(" short read or write: res: %d, bytes rd/wr: %u\n", res, brw);
529 res = 64;
530 }
531 addr += CONFIG_CPM_BLOCK_SIZE;
532 }
533
534 if (dowrite && !res) {
535 dp->flags |= DRV_FLG_DIRTY;
536 bg_setstat(handle_cpm_drv_to, 1);
537 }
538
539 if (buserr) {
540 debug_cpmsd("Bus timeout\n");
541 rc = 0x03;
542 }
543
544 /* send result*/
545 msg_cpm_result(subf, rc, res);
546 }
547
548
549 const FLASH struct msg_item z80_messages[] =
550 {
551 { 0, /* fct nr. */
552 1, 3, /* sub fct nr. from, to */
553 do_msg_ini_memfifo},
554 { 1,
555 1, 1,
556 do_msg_char_out},
557 { 1,
558 2, 2,
559 do_msg_echo},
560 { 2,
561 0, 0,
562 do_msg_cpm_login},
563 { 2,
564 1, 2,
565 do_msg_cpm_rw},
566 { 3,
567 1, 1,
568 do_msg_get_timer},
569 { 3,
570 2, 3, /* 2: get, 3: set time and date */
571 do_msg_get_set_time},
572 { 0xff, /* end mark */
573 0, 0,
574 0},
575
576 };
577
578
579
580
581 void do_message(int len, uint8_t *msg)
582 {
583 uint8_t fct, sub_fct;
584 int_fast8_t i = 0;
585
586 if (len >= 2) {
587 fct = *msg++;
588 sub_fct = *msg++;
589 len -= 2;
590
591 while (fct != z80_messages[i].fct) {
592 if (z80_messages[i].fct == 0xff) {
593 DBG_P(1, "do_message: Unknown function: %i, %i\n",
594 fct, sub_fct);
595 return; /* TODO: unknown message # */
596 }
597
598 ++i;
599 }
600
601 while (fct == z80_messages[i].fct) {
602 if (sub_fct >= z80_messages[i].sub_min &&
603 sub_fct <= z80_messages[i].sub_max )
604 break;
605 ++i;
606 }
607
608 if (z80_messages[i].fct != fct) {
609 DBG_P(1, "do_message: Unknown sub function: %i, %i\n",
610 fct, sub_fct);
611 return; /* TODO: unknown message sub# */
612 }
613
614 (z80_messages[i].func)(sub_fct, len, msg);
615
616
617 } else {
618 /* TODO: error */
619 DBG_P(1, "do_message: to few arguments (%i); this shouldn't happen!\n", len);
620 }
621 }
622
623
624
625 #define CTRBUF_LEN 256
626
627 void check_msg_fifo(void)
628 {
629 int ch;
630 static int_fast8_t state;
631 static int msglen,idx;
632 static uint8_t buffer[CTRBUF_LEN];
633
634 while ((ch = z80_memfifo_getc(fifo_msgin)) >= 0) {
635 switch (state) {
636 case 0: /* wait for start of message */
637 if (ch == 0xAE) { /* TODO: magic number */
638 msglen = 0;
639 idx = 0;
640 state = 1;
641 }
642 break;
643 case 1: /* get msg len */
644 if (ch > 0 && ch <= CTRBUF_LEN) {
645 msglen = ch;
646 state = 2;
647 } else
648 state = 0;
649 break;
650 case 2: /* get message */
651 buffer[idx++] = ch;
652 if (idx == msglen) {
653 do_message(msglen, buffer);
654 state = 0;
655 }
656 break;
657 }
658 }
659 }
660
661
662 int msg_handling(int state)
663 {
664 bool pending;
665
666 ATOMIC_BLOCK(ATOMIC_FORCEON) {
667 pending = (Stat & S_MSG_PENDING) != 0;
668 Stat &= ~S_MSG_PENDING;
669 }
670
671 if (pending) {
672 uint8_t init_request;
673 z80_bus_cmd(Request);
674 init_request = z80_read(0x43);
675 z80_bus_cmd(Release);
676 if ( init_request != 0) {
677 /* Get address of fifo 0 */
678 z80_bus_cmd(Request);
679 uint32_t fifo_addr = z80_read(0x40) +
680 ((uint16_t) z80_read(0x40+1) << 8) +
681 ((uint32_t) z80_read(0x40+2) << 16);
682 z80_write(0x43, 0);
683 z80_bus_cmd(Release);
684
685 if (fifo_addr != 0) {
686 z80_memfifo_init(fifo_msgin, fifo_addr);
687 state = 1;
688 } else
689 state = 0;
690
691 } else {
692 check_msg_fifo();
693 }
694 }
695
696 return state;
697 }
698
699
700 static int handle_msg_handling;
701
702 void setup_z180_serv(void)
703 {
704
705 handle_msg_handling = bg_register(msg_handling, 0);
706 handle_cpm_drv_to = bg_register(cpm_drv_to, 0);
707 }
708
709 void restart_z180_serv(void)
710 {
711 z80_bus_cmd(Request);
712 z80_memset(0x40, 0, 4);
713 z80_bus_cmd(Release);
714
715 for (int i = 0; i < NUM_FIFOS; i++)
716 z80_memfifo_init(i, 0);
717 bg_setstat(handle_msg_handling, 0);
718
719 }
720
721 #if 0
722 /*--------------------------------------------------------------------------*/
723
724 const FLASH uint8_t iniprog[] = {
725 0xAF, // xor a
726 0xED, 0x39, 0x36, // out0 (rcr),a ;disable DRAM refresh
727 0x3E, 0x30, // ld a,030h
728 0xED, 0x39, 0x32 //out0 (dcntl),a ;0 mem, max i/0 wait states
729 };
730
731 const FLASH uint8_t sertest[] = {
732 0xAF, // xor a
733 0xED, 0x39, 0x36, // out0 (rcr),a ;disable DRAM refresh
734 0x3E, 0x30, // ld a,030h
735 0xED, 0x39, 0x32, // out0 (dcntl),a ;0 mem, max i/0 wait states
736 0x3E, 0x80, // ld a,M_MPBT ;no MP, PS=10, DR=16, SS=0
737 0xED, 0x39, 0x03, // out0 (cntlb1),a
738 0x3E, 0x64, // ld a,M_RE + M_TE + M_MOD2 ;
739 0xED, 0x39, 0x01, // out0 (cntla1),a
740 0x3E, 0x00, // ld a,0
741 0xED, 0x39, 0x05, // out0 (stat1),a ;Enable rx interrupts
742 0xED, 0x38, 0x05, //l0:in0 a,(stat1)
743 0xE6, 0x80, // and 80h
744 0x28, 0xF9, // jr z,l0
745 0xED, 0x00, 0x09, // in0 b,(rdr1)
746 0xED, 0x38, 0x05, //l1:in0 a,(stat1)
747 0xE6, 0x02, // and 02h
748 0x28, 0xF9, // jr z,l1
749 0xED, 0x01, 0x07, // out0 (tdr1),b
750 0x18, 0xEA, // jr l0
751 };
752
753 const FLASH uint8_t test1[] = {
754 0xAF, // xor a
755 0xED, 0x39, 0x36, // out0 (rcr),a ;disable DRAM refresh
756 0x3E, 0x30, // ld a,030h
757 0xED, 0x39, 0x32, // out0 (dcntl),a ;0 mem, max i/0 wait states
758 0x21, 0x1E, 0x00, // ld hl,dmclrt ;load DMA registers
759 0x06, 0x08, // ld b,dmct_e-dmclrt
760 0x0E, 0x20, // ld c,sar0l
761 0xED, 0x93, // otimr
762 0x3E, 0xC3, // ld a,0c3h ;dst +1, src +1, burst
763 0xED, 0x39, 0x31, // out0 (dmode),a ;
764 0x3E, 0x62, // ld a,062h ;enable dma0,
765 0xED, 0x39, 0x30, //cl_1: out0 (dstat),a ;copy 64k
766 0x18, 0xFB, // jr cl_1 ;
767 0x00, 0x00, //dmclrt: dw 0 ;src (inc)
768 0x00, // db 0 ;src
769 0x00, 0x00, // dw 0 ;dst (inc),
770 0x00, // db 0 ;dst
771 0x00, 0x00, // dw 0 ;count (64k)
772 };
773 #endif
Z180 Stamp Monitor