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1.1 root 1: /*
1.1.1.4 root 2: Hatari - rs232.c
1.1 root 3:
1.1.1.4 root 4: This file is distributed under the GNU Public License, version 2 or at
5: your option any later version. Read the file gpl.txt for details.
1.1 root 6:
1.1.1.4 root 7: RS-232 Communications
1.1.1.3 root 8:
1.1.1.4 root 9: This is similar to the printing functions, we open a direct file
10: (e.g. /dev/ttyS0) and send bytes over it.
11: Using such method mimicks the ST exactly, and even allows us to connect
12: to an actual ST! To wait for incoming data, we create a thread which copies
13: the bytes into an input buffer. This method fits in with the internet code
14: which also reads data into a buffer.
15: */
1.1.1.13 root 16: const char RS232_fileid[] = "Hatari rs232.c : " __DATE__ " " __TIME__;
1.1.1.4 root 17:
1.1.1.9 root 18: #include <config.h>
1.1.1.4 root 19:
20: #if HAVE_TERMIOS_H
21: # include <termios.h>
22: # include <unistd.h>
23: #endif
24:
25: #include <SDL.h>
26: #include <SDL_thread.h>
27: #include <errno.h>
1.1.1.3 root 28:
1.1 root 29: #include "main.h"
1.1.1.4 root 30: #include "configuration.h"
1.1.1.10 root 31: #include "ioMem.h"
1.1.1.8 root 32: #include "m68000.h"
1.1.1.4 root 33: #include "mfp.h"
1.1 root 34: #include "rs232.h"
1.1.1.2 root 35:
1.1 root 36:
1.1.1.4 root 37: #define RS232_DEBUG 0
38:
39: #if RS232_DEBUG
40: #define Dprintf(a) printf a
41: #else
42: #define Dprintf(a)
43: #endif
44:
45:
1.1.1.8 root 46: static FILE *hComIn = NULL; /* Handle to file for reading */
47: static FILE *hComOut = NULL; /* Handle to file for writing */
1.1.1.4 root 48:
1.1.1.8 root 49: static unsigned char InputBuffer_RS232[MAX_RS232INPUT_BUFFER];
50: static int InputBuffer_Head=0, InputBuffer_Tail=0;
1.1.1.4 root 51:
1.1.1.8 root 52:
53: #if HAVE_TERMIOS_H
54:
55: #if !HAVE_CFMAKERAW
1.1.1.4 root 56: static inline void cfmakeraw(struct termios *termios_p)
57: {
58: termios_p->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
59: termios_p->c_oflag &= ~OPOST;
60: termios_p->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
61: termios_p->c_cflag &= ~(CSIZE|PARENB);
62: termios_p->c_cflag |= CS8;
63: }
64: #endif
65:
1.1.1.9 root 66:
67: #if defined(__AMIGAOS4__)
68:
69: // dummy functions. REMOVE THEM LATER
70:
71: int tcgetattr(int file_descriptor,struct termios *tios_p)
72: {
73: return -1;
74: }
75:
76: int tcsetattr(int file_descriptor,int action,struct termios *tios_p)
77: {
78: return -1;
79: }
80:
81: int cfsetospeed(struct termios *tios, speed_t ospeed)
82: {
83:
84: tios->c_ospeed = ospeed;
85:
86: return 0;
87: }
88:
89:
90: int cfsetispeed(struct termios *tios,speed_t ispeed)
91: {
92: tios->c_ispeed = ispeed;
93:
94: return 0;
95: }
96:
97: #endif /* __AMIGAOS4__ */
98:
99:
1.1.1.4 root 100: /*-----------------------------------------------------------------------*/
1.1.1.9 root 101: /**
102: * Set serial line parameters to "raw" mode.
103: */
1.1.1.11 root 104: static bool RS232_SetRawMode(FILE *fhndl)
1.1 root 105: {
1.1.1.8 root 106: struct termios termmode;
107: int fd;
1.1 root 108:
1.1.1.8 root 109: memset (&termmode, 0, sizeof(termmode)); /* Init with zeroes */
110: fd = fileno(fhndl); /* Get file descriptor */
1.1.1.4 root 111:
1.1.1.8 root 112: if (isatty(fd))
1.1.1.4 root 113: {
1.1.1.8 root 114: if (tcgetattr(fd, &termmode) != 0)
1.1.1.13 root 115: return false;
1.1.1.8 root 116:
117: /* Set "raw" mode: */
118: termmode.c_cc[VMIN] = 1;
119: termmode.c_cc[VTIME] = 0;
120: cfmakeraw(&termmode);
121: if (tcsetattr(fd, TCSADRAIN, &termmode) != 0)
1.1.1.13 root 122: return false;
1.1.1.4 root 123: }
124:
1.1.1.13 root 125: return true;
1.1.1.8 root 126: }
1.1.1.4 root 127:
128: /*-----------------------------------------------------------------------*/
1.1.1.9 root 129: /**
130: * Set hardware configuration of RS-232:
131: * - Bits per character
132: * - Parity
133: * - Start/stop bits
134: */
1.1.1.14 root 135: static bool RS232_SetBitsConfig(FILE *fhndl, int nCharSize, int nStopBits, bool bUseParity, bool bEvenParity)
1.1.1.4 root 136: {
137: struct termios termmode;
1.1.1.14 root 138: int fd;
1.1.1.4 root 139:
140: memset (&termmode, 0, sizeof(termmode)); /* Init with zeroes */
1.1.1.14 root 141: fd = fileno(fhndl);
1.1.1.4 root 142:
143: if (isatty(fd))
144: {
145: if (tcgetattr(fd, &termmode) != 0)
1.1.1.8 root 146: {
147: Dprintf(("RS232_SetBitsConfig: tcgetattr failed.\n"));
1.1.1.13 root 148: return false;
1.1.1.8 root 149: }
1.1.1.4 root 150:
1.1.1.8 root 151: /* Set the character size: */
152: termmode.c_cflag &= ~CSIZE;
153: switch (nCharSize)
154: {
155: case 8: termmode.c_cflag |= CS8; break;
156: case 7: termmode.c_cflag |= CS7; break;
157: case 6: termmode.c_cflag |= CS6; break;
158: case 5: termmode.c_cflag |= CS5; break;
159: }
160:
161: /* Set stop bits: */
162: if (nStopBits >= 2)
163: termmode.c_oflag |= CSTOPB;
164: else
165: termmode.c_oflag &= ~CSTOPB;
166:
167: /* Parity bit: */
168: if (bUseParity)
169: termmode.c_cflag |= PARENB;
170: else
171: termmode.c_cflag &= ~PARENB;
172:
173: if (bEvenParity)
174: termmode.c_cflag &= ~PARODD;
175: else
176: termmode.c_cflag |= PARODD;
177:
178: /* Now store the configuration: */
1.1.1.4 root 179: if (tcsetattr(fd, TCSADRAIN, &termmode) != 0)
1.1.1.8 root 180: {
181: Dprintf(("RS232_SetBitsConfig: tcsetattr failed.\n"));
1.1.1.13 root 182: return false;
1.1.1.8 root 183: }
1.1.1.4 root 184: }
185:
1.1.1.13 root 186: return true;
1.1 root 187: }
1.1.1.8 root 188:
1.1.1.4 root 189: #endif /* HAVE_TERMIOS_H */
1.1 root 190:
1.1.1.4 root 191:
192: /*-----------------------------------------------------------------------*/
1.1.1.9 root 193: /**
194: * Open file on COM port.
195: */
1.1.1.11 root 196: static bool RS232_OpenCOMPort(void)
1.1 root 197: {
1.1.1.17! root 198: bool ok = true;
1.1.1.3 root 199:
1.1.1.17! root 200: if (!hComOut && ConfigureParams.RS232.szOutFileName[0])
1.1.1.4 root 201: {
1.1.1.17! root 202: /* Create our COM file for output */
! 203: hComOut = fopen(ConfigureParams.RS232.szOutFileName, "wb");
! 204: if (hComOut)
! 205: {
! 206: setvbuf(hComOut, NULL, _IONBF, 0);
1.1.1.4 root 207: #if HAVE_TERMIOS_H
1.1.1.17! root 208: /* First set the output parameters to "raw" mode */
! 209: if (!RS232_SetRawMode(hComOut))
! 210: {
! 211: Log_Printf(LOG_WARN, "Can't set raw mode for %s\n",
! 212: ConfigureParams.RS232.szOutFileName);
! 213: }
! 214: #endif
! 215: Dprintf(("Successfully opened RS232 output file.\n"));
! 216: }
! 217: else
! 218: {
! 219: Log_Printf(LOG_WARN, "RS232: Failed to open output file %s\n",
! 220: ConfigureParams.RS232.szOutFileName);
! 221: ok = false;
! 222: }
1.1.1.4 root 223: }
224:
1.1.1.17! root 225: if (!hComIn && ConfigureParams.RS232.szInFileName[0])
1.1.1.4 root 226: {
1.1.1.17! root 227: /* Create our COM file for input */
! 228: hComIn = fopen(ConfigureParams.RS232.szInFileName, "rb");
! 229: if (hComIn)
! 230: {
! 231: setvbuf(hComIn, NULL, _IONBF, 0);
! 232: #if HAVE_TERMIOS_H
! 233: /* Now set the input parameters to "raw" mode */
! 234: if (!RS232_SetRawMode(hComIn))
! 235: {
! 236: Log_Printf(LOG_WARN, "Can't set raw mode for %s\n",
! 237: ConfigureParams.RS232.szInFileName);
! 238: }
1.1.1.4 root 239: #endif
1.1.1.17! root 240: Dprintf(("Successfully opened RS232 input file.\n"));
! 241: }
! 242: else
! 243: {
! 244: Log_Printf(LOG_WARN, "RS232: Failed to open input file %s\n",
! 245: ConfigureParams.RS232.szInFileName);
! 246: ok = false;
! 247: }
! 248: }
! 249: return ok;
1.1 root 250: }
251:
1.1.1.4 root 252:
253: /*-----------------------------------------------------------------------*/
1.1.1.9 root 254: /**
255: * Close file on COM port
256: */
1.1.1.8 root 257: static void RS232_CloseCOMPort(void)
1.1 root 258: {
1.1.1.17! root 259: if (hComIn)
1.1.1.4 root 260: {
261: /* Close */
262: fclose(hComIn);
263: hComIn = NULL;
1.1.1.17! root 264: }
! 265: if (hComOut)
! 266: {
1.1.1.4 root 267: fclose(hComOut);
268: hComOut = NULL;
269: }
1.1.1.17! root 270: Dprintf(("Closed RS232 files.\n"));
1.1 root 271: }
272:
1.1.1.4 root 273:
1.1.1.8 root 274: /* thread stuff */
275: static SDL_sem* pSemFreeBuf; /* Semaphore to sync free space in InputBuffer_RS232 */
276: static SDL_Thread *RS232Thread = NULL; /* Thread handle for reading incoming data */
277:
278:
1.1.1.4 root 279: /*-----------------------------------------------------------------------*/
1.1.1.9 root 280: /**
281: * Add incoming bytes from other machine into our input buffer
282: */
1.1.1.8 root 283: static void RS232_AddBytesToInputBuffer(unsigned char *pBytes, int nBytes)
1.1.1.4 root 284: {
1.1.1.8 root 285: int i;
1.1 root 286:
1.1.1.8 root 287: /* Copy bytes into input buffer */
288: for (i=0; i<nBytes; i++)
289: {
290: SDL_SemWait(pSemFreeBuf); /* Wait for free space in buffer */
291: InputBuffer_RS232[InputBuffer_Tail] = *pBytes++;
292: InputBuffer_Tail = (InputBuffer_Tail+1) % MAX_RS232INPUT_BUFFER;
293: }
294: }
1.1.1.4 root 295:
1.1.1.8 root 296:
297: /*-----------------------------------------------------------------------*/
1.1.1.9 root 298: /**
299: * Thread to read incoming RS-232 data, and pass to emulator input buffer
300: */
1.1.1.8 root 301: static int RS232_ThreadFunc(void *pData)
302: {
303: int iInChar;
304: unsigned char cInChar;
305:
306: /* Check for any RS-232 incoming data */
1.1.1.13 root 307: while (true)
1.1.1.4 root 308: {
1.1.1.8 root 309: if (hComIn)
1.1.1.4 root 310: {
1.1.1.8 root 311: /* Read the bytes in, if we have any */
312: iInChar = fgetc(hComIn);
313: if (iInChar != EOF)
314: {
315: /* Copy into our internal queue */
316: cInChar = iInChar;
317: RS232_AddBytesToInputBuffer(&cInChar, 1);
318: /* FIXME: Use semaphores to lock MFP variables? */
319: MFP_InputOnChannel(MFP_RCVBUFFULL_BIT, MFP_IERA, &MFP_IPRA);
320: Dprintf(("RS232: Read character $%x\n", iInChar));
1.1.1.15 root 321: /* Sleep for a while */
322: SDL_Delay(2);
1.1.1.8 root 323: }
324: else
325: {
326: /*Dprintf(("RS232: Reached end of input file!\n"));*/
1.1.1.15 root 327: /* potential data race on hComIn modification */
1.1.1.8 root 328: clearerr(hComIn);
329: SDL_Delay(20);
330: }
331: }
332: else
1.1.1.4 root 333: {
1.1.1.15 root 334: /* No RS-232 connection, sleep for 0.2s */
335: SDL_Delay(200);
1.1.1.4 root 336: }
1.1.1.8 root 337: }
1.1.1.4 root 338:
1.1.1.13 root 339: return true;
1.1.1.8 root 340: }
1.1.1.4 root 341:
342:
1.1.1.8 root 343: /*-----------------------------------------------------------------------*/
1.1.1.9 root 344: /**
345: * Initialize RS-232, start thread to wait for incoming data
1.1.1.15 root 346: * (we will open a connection when first bytes are sent even
347: * if RS-232 isn't initialized for reading).
1.1.1.9 root 348: */
1.1.1.8 root 349: void RS232_Init(void)
350: {
351: if (ConfigureParams.RS232.bEnableRS232)
352: {
1.1.1.17! root 353: if (!RS232_OpenCOMPort())
! 354: {
! 355: RS232_CloseCOMPort();
! 356: Log_AlertDlg(LOG_ERROR, "RS232 input or output file open failed. RS232 support disabled.");
! 357: ConfigureParams.RS232.bEnableRS232 = false;
! 358: return;
! 359: }
! 360: }
! 361: if (hComIn)
! 362: {
1.1.1.8 root 363: /* Create semaphore */
364: if (pSemFreeBuf == NULL)
365: pSemFreeBuf = SDL_CreateSemaphore(MAX_RS232INPUT_BUFFER);
366: if (pSemFreeBuf == NULL)
367: {
1.1.1.17! root 368: RS232_CloseCOMPort();
1.1.1.14 root 369: Log_Printf(LOG_WARN, "RS232_Init: Can't create semaphore!\n");
1.1.1.8 root 370: return;
371: }
1.1.1.4 root 372:
1.1.1.8 root 373: /* Create thread to wait for incoming bytes over RS-232 */
374: if (!RS232Thread)
1.1.1.4 root 375: {
1.1.1.8 root 376: RS232Thread = SDL_CreateThread(RS232_ThreadFunc, NULL);
377: Dprintf(("RS232 thread has been created.\n"));
1.1.1.4 root 378: }
379: }
1.1.1.8 root 380: }
1.1.1.4 root 381:
1.1.1.8 root 382:
383: /*-----------------------------------------------------------------------*/
1.1.1.9 root 384: /**
385: * Close RS-232 connection and stop checking for incoming data.
386: */
1.1.1.8 root 387: void RS232_UnInit(void)
388: {
389: /* Close, kill thread and free resource */
390: if (RS232Thread)
391: {
1.1.1.15 root 392: /* Instead of killing the thread directly, we should
393: * probably better inform it via IPC so that it can
394: * terminate gracefully... but then we would need to
395: * wait until it exits, otherwise there's a data race
396: * on accessing/modifying hComIn.
397: */
1.1.1.8 root 398: Dprintf(("Killing RS232 thread...\n"));
399: SDL_KillThread(RS232Thread);
400: RS232Thread = NULL;
401: }
402: RS232_CloseCOMPort();
1.1.1.9 root 403:
1.1.1.8 root 404: if (pSemFreeBuf)
405: {
406: SDL_DestroySemaphore(pSemFreeBuf);
407: pSemFreeBuf = NULL;
408: }
1.1.1.4 root 409: }
1.1 root 410:
1.1.1.4 root 411:
412: /*-----------------------------------------------------------------------*/
1.1.1.9 root 413: /**
414: * Set hardware configuration of RS-232 according to the USART control register.
415: *
416: * ucr: USART Control Register
417: * Bit 0: unused
418: * Bit 1: 0-Odd Parity, 1-Even Parity
419: * Bit 2: 0-No Parity, 1-Parity
420: * Bits 3,4: Start/Stop bits
421: * 0 0 : 0-Start, 0-Stop Synchronous
422: * 0 1 : 0-Start, 1-Stop Asynchronous
423: * 1 0 : 1-Start, 1.5-Stop Asynchronous
424: * 1 1 : 1-Start, 2-Stop Asynchronous
425: * Bits 5,6: 'WordLength'
426: * 0 0 : 8 Bits
427: * 0 1 : 7 Bits
428: * 1 0 : 6 Bits
429: * 1 1 : 5 Bits
430: * Bit 7: Frequency from TC and RC
431: */
1.1.1.14 root 432: void RS232_HandleUCR(Sint16 ucr)
1.1.1.4 root 433: {
434: #if HAVE_TERMIOS_H
435: int nCharSize; /* Bits per character: 5, 6, 7 or 8 */
436: int nStopBits; /* Stop bits: 0=0 bits, 1=1 bit, 2=1.5 bits, 3=2 bits */
437:
438: nCharSize = 8 - ((ucr >> 5) & 3);
439: nStopBits = (ucr >> 3) & 3;
440:
441: Dprintf(("RS232_HandleUCR(%i) : character size=%i , stop bits=%i\n",
442: ucr, nCharSize, nStopBits));
443:
444: if (hComOut != NULL)
445: {
1.1.1.14 root 446: if (!RS232_SetBitsConfig(hComOut, nCharSize, nStopBits, ucr&4, ucr&2))
447: Log_Printf(LOG_WARN, "RS232_HandleUCR: failed to set bits configuration for %s\n", ConfigureParams.RS232.szOutFileName);
1.1.1.4 root 448: }
449:
450: if (hComIn != NULL)
451: {
1.1.1.14 root 452: if (!RS232_SetBitsConfig(hComIn, nCharSize, nStopBits, ucr&4, ucr&2))
453: Log_Printf(LOG_WARN, "RS232_HandleUCR: failed to set bits configuration for %s\n", ConfigureParams.RS232.szInFileName);
1.1.1.4 root 454: }
1.1.1.5 root 455: #endif /* HAVE_TERMIOS_H */
1.1.1.4 root 456: }
457:
458:
459: /*-----------------------------------------------------------------------*/
1.1.1.9 root 460: /**
461: * Set baud rate configuration of RS-232.
462: */
1.1.1.11 root 463: bool RS232_SetBaudRate(int nBaud)
1.1.1.4 root 464: {
465: #if HAVE_TERMIOS_H
466: int i;
467: int fd;
468: speed_t baudtype;
469: struct termios termmode;
1.1.1.8 root 470: static const int baudtable[][2] =
1.1.1.4 root 471: {
472: { 50, B50 },
473: { 75, B75 },
474: { 110, B110 },
475: { 134, B134 },
476: { 150, B150 },
477: { 200, B200 },
478: { 300, B300 },
479: { 600, B600 },
480: { 1200, B1200 },
481: { 1800, B1800 },
482: { 2400, B2400 },
483: { 4800, B4800 },
484: { 9600, B9600 },
485: { 19200, B19200 },
486: { 38400, B38400 },
487: { 57600, B57600 },
488: { 115200, B115200 },
1.1.1.8 root 489: #ifdef B230400 /* B230400 is not defined on all systems */
1.1.1.4 root 490: { 230400, B230400 },
1.1.1.8 root 491: #endif
1.1.1.4 root 492: { -1, -1 }
493: };
494:
495: Dprintf(("RS232_SetBaudRate(%i)\n", nBaud));
496:
497: /* Convert baud number to baud termios constant: */
498: baudtype = -1;
499: for (i = 0; baudtable[i][0] != -1; i++)
500: {
501: if (baudtable[i][0] == nBaud)
502: {
503: baudtype = baudtable[i][1];
504: break;
505: }
506: }
507:
1.1.1.5 root 508: if (baudtype == (speed_t)-1)
1.1.1.4 root 509: {
510: Dprintf(("RS232_SetBaudRate: Unsupported baud rate %i.\n", nBaud));
1.1.1.13 root 511: return false;
1.1.1.4 root 512: }
513:
514: /* Set ouput speed: */
515: if (hComOut != NULL)
516: {
517: memset (&termmode, 0, sizeof(termmode)); /* Init with zeroes */
518: fd = fileno(hComOut);
519: if (isatty(fd))
520: {
521: if (tcgetattr(fd, &termmode) != 0)
1.1.1.13 root 522: return false;
1.1.1.4 root 523:
524: cfsetospeed(&termmode, baudtype);
525:
526: if (tcsetattr(fd, TCSADRAIN, &termmode) != 0)
1.1.1.13 root 527: return false;
1.1.1.4 root 528: }
529: }
530:
531: /* Set input speed: */
532: if (hComIn != NULL)
533: {
534: memset (&termmode, 0, sizeof(termmode)); /* Init with zeroes */
535: fd = fileno(hComIn);
536: if (isatty(fd))
537: {
538: if (tcgetattr(fd, &termmode) != 0)
1.1.1.13 root 539: return false;
1.1.1.4 root 540:
541: cfsetispeed(&termmode, baudtype);
542:
543: if (tcsetattr(fd, TCSADRAIN, &termmode) != 0)
1.1.1.13 root 544: return false;
1.1.1.4 root 545: }
546: }
547: #endif /* HAVE_TERMIOS_H */
548:
1.1.1.13 root 549: return true;
1.1.1.4 root 550: }
551:
552:
553: /*-----------------------------------------------------------------------*/
1.1.1.9 root 554: /**
555: * Set baud rate configuration of RS-232 according to the Timer-D hardware
556: * registers.
557: */
1.1.1.4 root 558: void RS232_SetBaudRateFromTimerD(void)
1.1 root 559: {
1.1.1.4 root 560: int nTimerD_CR, nTimerD_DR, nBaudRate;
561:
1.1.1.10 root 562: nTimerD_CR = IoMem[0xfffa1d] & 0x07;
563: nTimerD_DR = IoMem[0xfffa25];
1.1.1.4 root 564:
565: if (!nTimerD_CR)
566: return;
567:
1.1.1.13 root 568: if ( nTimerD_DR == 0 )
569: nTimerD_DR = 256; /* In MFP, a data register=0 is in fact 256 */
570:
1.1.1.4 root 571: /* Calculate baud rate: (MFP/Timer-D is supplied with 2.4576 MHz) */
572: nBaudRate = 2457600 / nTimerD_DR / 2;
1.1.1.11 root 573:
574: /*if (IoMem[0xfffa29] & 0x80)*/ /* We only support the by-16 prescaler */
575: nBaudRate /= 16;
576:
1.1.1.4 root 577: switch (nTimerD_CR)
578: {
579: case 1: nBaudRate /= 4; break;
580: case 2: nBaudRate /= 10; break;
581: case 3: nBaudRate /= 16; break;
582: case 4: nBaudRate /= 50; break;
583: case 5: nBaudRate /= 64; break;
584: case 6: nBaudRate /= 100; break;
585: case 7: nBaudRate /= 200; break;
586: }
587:
588: /* Adjust some ugly baud rates from TOS to more reasonable values: */
589: switch (nBaudRate)
590: {
591: case 80: nBaudRate = 75; break;
592: case 109: nBaudRate = 110; break;
593: case 120: nBaudRate = 110; break;
594: case 1745: nBaudRate = 1800; break;
595: case 1920: nBaudRate = 1800; break;
596: }
1.1 root 597:
1.1.1.4 root 598: RS232_SetBaudRate(nBaudRate);
599: }
600:
601:
602: /*-----------------------------------------------------------------------*/
1.1.1.9 root 603: /**
604: * Set flow control configuration of RS-232.
605: */
1.1.1.14 root 606: void RS232_SetFlowControl(Sint16 ctrl)
1.1.1.4 root 607: {
608: Dprintf(("RS232_SetFlowControl(%i)\n", ctrl));
609:
610: /* Not yet written */
1.1 root 611: }
612:
1.1.1.4 root 613:
614: /*----------------------------------------------------------------------- */
1.1.1.9 root 615: /**
616: * Pass bytes from emulator to RS-232
617: */
1.1.1.14 root 618: bool RS232_TransferBytesTo(Uint8 *pBytes, int nBytes)
1.1 root 619: {
1.1.1.15 root 620: /* Make sure there's a RS-232 connection if it's enabled */
621: if (ConfigureParams.RS232.bEnableRS232)
622: RS232_OpenCOMPort();
1.1.1.4 root 623:
624: /* Have we connected to the RS232? */
1.1.1.17! root 625: if (hComOut)
1.1.1.4 root 626: {
627: /* Send bytes directly to the COM file */
628: if (fwrite(pBytes, 1, nBytes, hComOut))
629: {
630: Dprintf(("RS232: Sent %i bytes ($%x ...)\n", nBytes, *pBytes));
631: MFP_InputOnChannel(MFP_TRNBUFEMPTY_BIT, MFP_IERA, &MFP_IPRA);
632:
1.1.1.13 root 633: return true; /* OK */
1.1.1.4 root 634: }
635: }
636:
1.1.1.13 root 637: return false; /* Failed */
1.1.1.4 root 638: }
639:
640:
641: /*-----------------------------------------------------------------------*/
1.1.1.9 root 642: /**
643: * Read characters from our internal input buffer (bytes from other machine)
644: */
1.1.1.14 root 645: bool RS232_ReadBytes(Uint8 *pBytes, int nBytes)
1.1.1.4 root 646: {
647: int i;
648:
649: /* Connected? */
1.1.1.17! root 650: if (hComIn && InputBuffer_Head != InputBuffer_Tail)
1.1.1.4 root 651: {
652: /* Read bytes out of input buffer */
653: for (i=0; i<nBytes; i++)
654: {
655: *pBytes++ = InputBuffer_RS232[InputBuffer_Head];
656: InputBuffer_Head = (InputBuffer_Head+1) % MAX_RS232INPUT_BUFFER;
657: SDL_SemPost(pSemFreeBuf); /* Signal free space */
658: }
1.1.1.13 root 659: return true;
1.1.1.4 root 660: }
661:
1.1.1.13 root 662: return false;
1.1.1.4 root 663: }
664:
665:
666: /*-----------------------------------------------------------------------*/
1.1.1.9 root 667: /**
1.1.1.13 root 668: * Return true if bytes waiting!
1.1.1.9 root 669: */
1.1.1.11 root 670: bool RS232_GetStatus(void)
1.1.1.4 root 671: {
672: /* Connected? */
1.1.1.17! root 673: if (hComIn)
1.1.1.4 root 674: {
675: /* Do we have bytes in the input buffer? */
676: if (InputBuffer_Head != InputBuffer_Tail)
1.1.1.13 root 677: return true;
1.1.1.4 root 678: }
1.1 root 679:
1.1.1.4 root 680: /* No, none */
1.1.1.13 root 681: return false;
1.1.1.4 root 682: }
1.1 root 683:
684:
1.1.1.4 root 685: /*-----------------------------------------------------------------------*/
1.1.1.9 root 686: /**
687: * Read from the Syncronous Character Register.
688: */
1.1.1.4 root 689: void RS232_SCR_ReadByte(void)
1.1 root 690: {
1.1.1.8 root 691: M68000_WaitState(4);
692:
693: /* nothing */
1.1.1.4 root 694: }
695:
696: /*-----------------------------------------------------------------------*/
1.1.1.9 root 697: /**
698: * Write to the Syncronous Character Register.
699: */
1.1.1.4 root 700: void RS232_SCR_WriteByte(void)
701: {
1.1.1.8 root 702: M68000_WaitState(4);
703:
1.1.1.10 root 704: /*Dprintf(("RS232: Write to SCR: $%x\n", (int)IoMem[0xfffa27]));*/
1.1.1.4 root 705: }
1.1 root 706:
1.1.1.4 root 707:
708: /*-----------------------------------------------------------------------*/
1.1.1.9 root 709: /**
710: * Read from the USART Control Register.
711: */
1.1.1.4 root 712: void RS232_UCR_ReadByte(void)
713: {
1.1.1.8 root 714: M68000_WaitState(4);
715:
1.1.1.10 root 716: Dprintf(("RS232: Read from UCR: $%x\n", (int)IoMem[0xfffa29]));
1.1.1.4 root 717: }
1.1 root 718:
1.1.1.4 root 719: /*-----------------------------------------------------------------------*/
1.1.1.9 root 720: /**
721: * Write to the USART Control Register.
722: */
1.1.1.4 root 723: void RS232_UCR_WriteByte(void)
724: {
1.1.1.8 root 725: M68000_WaitState(4);
726:
1.1.1.10 root 727: Dprintf(("RS232: Write to UCR: $%x\n", (int)IoMem[0xfffa29]));
1.1.1.4 root 728:
1.1.1.17! root 729: RS232_HandleUCR(IoMem[0xfffa29]);
1.1 root 730: }
731:
1.1.1.4 root 732:
733: /*-----------------------------------------------------------------------*/
1.1.1.9 root 734: /**
735: * Read from the Receiver Status Register.
736: */
1.1.1.4 root 737: void RS232_RSR_ReadByte(void)
1.1 root 738: {
1.1.1.8 root 739: M68000_WaitState(4);
740:
1.1.1.4 root 741: if (RS232_GetStatus())
1.1.1.10 root 742: IoMem[0xfffa2b] |= 0x80; /* Buffer full */
1.1.1.4 root 743: else
1.1.1.10 root 744: IoMem[0xfffa2b] &= ~0x80; /* Buffer not full */
1.1.1.4 root 745:
1.1.1.10 root 746: Dprintf(("RS232: Read from RSR: $%x\n", (int)IoMem[0xfffa2b]));
1.1.1.4 root 747: }
748:
749: /*-----------------------------------------------------------------------*/
1.1.1.9 root 750: /**
751: * Write to the Receiver Status Register.
752: */
1.1.1.4 root 753: void RS232_RSR_WriteByte(void)
754: {
1.1.1.8 root 755: M68000_WaitState(4);
756:
1.1.1.10 root 757: Dprintf(("RS232: Write to RSR: $%x\n", (int)IoMem[0xfffa2b]));
1.1 root 758: }
759:
1.1.1.4 root 760:
761: /*-----------------------------------------------------------------------*/
1.1.1.9 root 762: /**
763: * Read from the Transmitter Status Register.
1.1.1.16 root 764: * When RS232 emulation is not enabled, we still return 0x80 to allow
765: * some games to work when they don't require send/receive on the RS232 port
766: * (eg : 'Treasure Trap', 'The Deep' write some debug informations to RS232)
1.1.1.9 root 767: */
1.1.1.4 root 768: void RS232_TSR_ReadByte(void)
1.1 root 769: {
1.1.1.8 root 770: M68000_WaitState(4);
771:
1.1.1.16 root 772: IoMem[0xfffa2d] |= 0x80; /* Buffer empty */
1.1 root 773:
1.1.1.10 root 774: Dprintf(("RS232: Read from TSR: $%x\n", (int)IoMem[0xfffa2d]));
1.1 root 775: }
776:
1.1.1.4 root 777: /*-----------------------------------------------------------------------*/
1.1.1.9 root 778: /**
779: * Write to the Transmitter Status Register.
780: */
1.1.1.4 root 781: void RS232_TSR_WriteByte(void)
782: {
1.1.1.8 root 783: M68000_WaitState(4);
784:
1.1.1.10 root 785: Dprintf(("RS232: Write to TSR: $%x\n", (int)IoMem[0xfffa2d]));
1.1.1.4 root 786: }
787:
788:
789: /*-----------------------------------------------------------------------*/
1.1.1.9 root 790: /**
791: * Read from the USART Data Register.
792: */
1.1.1.4 root 793: void RS232_UDR_ReadByte(void)
1.1 root 794: {
1.1.1.14 root 795: Uint8 InByte = 0;
1.1 root 796:
1.1.1.8 root 797: M68000_WaitState(4);
798:
1.1.1.4 root 799: RS232_ReadBytes(&InByte, 1);
1.1.1.10 root 800: IoMem[0xfffa2f] = InByte;
801: Dprintf(("RS232: Read from UDR: $%x\n", (int)IoMem[0xfffa2f]));
1.1.1.4 root 802:
803: if (RS232_GetStatus()) /* More data waiting? */
804: {
805: /* Yes, generate another interrupt. */
806: MFP_InputOnChannel(MFP_RCVBUFFULL_BIT, MFP_IERA, &MFP_IPRA);
807: }
1.1 root 808: }
1.1.1.4 root 809:
810: /*-----------------------------------------------------------------------*/
1.1.1.9 root 811: /**
812: * Write to the USART Data Register.
813: */
1.1.1.4 root 814: void RS232_UDR_WriteByte(void)
815: {
1.1.1.14 root 816: Uint8 OutByte;
1.1.1.4 root 817:
1.1.1.8 root 818: M68000_WaitState(4);
819:
1.1.1.10 root 820: OutByte = IoMem[0xfffa2f];
1.1.1.4 root 821: RS232_TransferBytesTo(&OutByte, 1);
1.1.1.10 root 822: Dprintf(("RS232: Write to UDR: $%x\n", (int)IoMem[0xfffa2f]));
1.1.1.4 root 823: }
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