| /* pdp11_ddcmp.h: Digital Data Communications Message Protocol support | |
| Copyright (c) 2013, Mark Pizzolato | |
| Permission is hereby granted, free of charge, to any person obtaining a | |
| copy of this software and associated documentation files (the "Software"), | |
| to deal in the Software without restriction, including without limitation | |
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| Software is furnished to do so, subject to the following conditions: | |
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| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
| ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | |
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| CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
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| in this Software without prior written authorization from Robert M Supnik. | |
| Digital Data Communications Message Protocol - DDCMP support routines | |
| 29-May-13 MP Initial implementation | |
| */ | |
| #ifndef PDP11_DDCMP_H_ | |
| #define PDP11_DDCMP_H_ 0 | |
| /* DDCMP packet types */ | |
| #define DDCMP_SYN 0226u /* Sync character on synchronous links */ | |
| #define DDCMP_DEL 0377u /* Sync character on asynchronous links */ | |
| #define DDCMP_SOH 0201u /* Numbered Data Message Identifier */ | |
| #define DDCMP_ENQ 0005u /* Control Message Identifier */ | |
| #define DDCMP_DLE 0220u /* Maintenance Message Identifier */ | |
| /* Support routines */ | |
| /* crc16 polynomial x^16 + x^15 + x^2 + 1 (0xA001) CCITT LSB */ | |
| static uint16 crc16_nibble[16] = { | |
| 0x0000, 0xCC01, 0xD801, 0x1400, 0xF001, 0x3C00, 0x2800, 0xE401, | |
| 0xA001, 0x6C00, 0x7800, 0xB401, 0x5000, 0x9C01, 0x8801, 0x4400, | |
| }; | |
| static uint16 ddcmp_crc16(uint16 crc, const void* vbuf, size_t len) | |
| { | |
| const unsigned char* buf = (const unsigned char*)vbuf; | |
| while(0 != len--) { | |
| crc = (crc>>4) ^ crc16_nibble[(*buf ^ crc) & 0xF]; | |
| crc = (crc>>4) ^ crc16_nibble[((*buf++)>>4 ^ crc) & 0xF]; | |
| }; | |
| return(crc); | |
| } | |
| /* Debug routines */ | |
| #include <ctype.h> | |
| static void ddcmp_packet_trace (uint32 reason, DEVICE *dptr, const char *txt, const uint8 *msg, int32 len, t_bool detail) | |
| { | |
| if (sim_deb && dptr && (reason & dptr->dctrl)) { | |
| sim_debug(reason, dptr, "%s len: %d\n", txt, len); | |
| if (detail) { | |
| int i, same, group, sidx, oidx; | |
| char outbuf[80], strbuf[18]; | |
| static char hex[] = "0123456789ABCDEF"; | |
| switch (msg[0]) { | |
| case DDCMP_SOH: /* Data Message */ | |
| sim_debug (reason, dptr, "Data Message, Link: %d, Count: %d, Resp: %d, Num: %d, HDRCRC: %s, DATACRC: %s\n", msg[2]>>6, ((msg[2] & 0x3F) << 8)|msg[1], msg[3], msg[4], | |
| (0 == ddcmp_crc16 (0, msg, 8)) ? "OK" : "BAD", (0 == ddcmp_crc16 (0, msg+8, 2+(((msg[2] & 0x3F) << 8)|msg[1]))) ? "OK" : "BAD"); | |
| break; | |
| case DDCMP_ENQ: /* Control Message */ | |
| sim_debug (reason, dptr, "Control: Type: %d ", msg[1]); | |
| switch (msg[1]) { | |
| case 1: /* ACK */ | |
| sim_debug (reason, dptr, "(ACK) ACKSUB: %d, Link: %d, Resp: %d\n", msg[2] & 0x3F, msg[2]>>6, msg[3]); | |
| break; | |
| case 2: /* NAK */ | |
| sim_debug (reason, dptr, "(NAK) Reason: %d, Link: %d, Resp: %d\n", msg[2] & 0x3F, msg[2]>>6, msg[3]); | |
| break; | |
| case 3: /* REP */ | |
| sim_debug (reason, dptr, "(REP) REPSUB: %d, Link: %d, Num: %d\n", msg[2] & 0x3F, msg[2]>>6, msg[4]); | |
| break; | |
| case 6: /* STRT */ | |
| sim_debug (reason, dptr, "(STRT) STRTSUB: %d, Link: %d\n", msg[2] & 0x3F, msg[2]>>6); | |
| break; | |
| case 7: /* STACK */ | |
| sim_debug (reason, dptr, "(STACK) STCKSUB: %d, Link: %d\n", msg[2] & 0x3F, msg[2]>>6); | |
| break; | |
| default: /* Unknown */ | |
| sim_debug (reason, dptr, "(Unknown=0%o)\n", msg[1]); | |
| break; | |
| } | |
| if (len != 8) { | |
| sim_debug (reason, dptr, "Unexpected Control Message Length: %d expected 8\n", len); | |
| } | |
| if (0 != ddcmp_crc16 (0, msg, len)) { | |
| sim_debug (reason, dptr, "Unexpected Message CRC\n"); | |
| } | |
| break; | |
| case DDCMP_DLE: /* Maintenance Message */ | |
| sim_debug (reason, dptr, "Maintenance Message, Link: %d, Count: %d, HDRCRC: %s, DATACRC: %s\n", msg[2]>>6, ((msg[2] & 0x3F) << 8)| msg[1], | |
| (0 == ddcmp_crc16 (0, msg, 8)) ? "OK" : "BAD", (0 == ddcmp_crc16 (0, msg+8, 2+(((msg[2] & 0x3F) << 8)| msg[1]))) ? "OK" : "BAD"); | |
| break; | |
| } | |
| for (i=same=0; i<len; i += 16) { | |
| if ((i > 0) && (0 == memcmp(&msg[i], &msg[i-16], 16))) { | |
| ++same; | |
| continue; | |
| } | |
| if (same > 0) { | |
| sim_debug(reason, dptr, "%04X thru %04X same as above\n", i-(16*same), i-1); | |
| same = 0; | |
| } | |
| group = (((len - i) > 16) ? 16 : (len - i)); | |
| for (sidx=oidx=0; sidx<group; ++sidx) { | |
| outbuf[oidx++] = ' '; | |
| outbuf[oidx++] = hex[(msg[i+sidx]>>4)&0xf]; | |
| outbuf[oidx++] = hex[msg[i+sidx]&0xf]; | |
| if (isprint(msg[i+sidx])) | |
| strbuf[sidx] = msg[i+sidx]; | |
| else | |
| strbuf[sidx] = '.'; | |
| } | |
| outbuf[oidx] = '\0'; | |
| strbuf[sidx] = '\0'; | |
| sim_debug(reason, dptr, "%04X%-48s %s\n", i, outbuf, strbuf); | |
| } | |
| if (same > 0) { | |
| sim_debug(reason, dptr, "%04X thru %04X same as above\n", i-(16*same), len-1); | |
| } | |
| } | |
| } | |
| } | |
| uint16 ddcmp_crc16(uint16 crc, const void* vbuf, size_t len); | |
| #endif /* PDP11_DDCMP_H_ */ |