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1 | /* Extractor for Geraet 32620 ROM files | |
2 | * | |
3 | * Copyright (c) 2020 Michael Gernoth <michael@gernoth.net> | |
4 | * | |
5 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
6 | * of this software and associated documentation files (the "Software"), to | |
7 | * deal in the Software without restriction, including without limitation the | |
8 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | |
9 | * sell copies of the Software, and to permit persons to whom the Software is | |
10 | * furnished to do so, subject to the following conditions: | |
11 | * | |
12 | * The above copyright notice and this permission notice shall be included in | |
13 | * all copies or substantial portions of the Software. | |
14 | * | |
15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
18 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
21 | * IN THE SOFTWARE. | |
22 | */ | |
23 | #include <errno.h> | |
24 | #include <inttypes.h> | |
25 | #include <fcntl.h> | |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <sys/types.h> | |
30 | #include <sys/stat.h> | |
31 | #include <unistd.h> | |
32 | ||
33 | int main(int argc, char **argv) | |
34 | { | |
35 | uint8_t header[64]; | |
36 | uint32_t adrs[(64/3)+1] = { 0 }; | |
37 | uint8_t cs2 = 0; | |
38 | int fd; | |
39 | int r; | |
40 | int i; | |
41 | int count = 0; | |
42 | ||
43 | if (argc != 3) { | |
44 | fprintf(stderr, "Syntax: %s in.bin prefix\n", argv[0]); | |
45 | exit(EXIT_FAILURE); | |
46 | } | |
47 | ||
48 | fd = open(argv[1], O_RDONLY); | |
49 | if (fd == -1) { | |
50 | perror("Can't open ROM"); | |
51 | exit(EXIT_FAILURE); | |
52 | } | |
53 | ||
54 | r = read(fd, header, sizeof(header)); | |
55 | if (r != sizeof(header)) { | |
56 | perror("Can't read header"); | |
57 | exit(EXIT_FAILURE); | |
58 | } | |
59 | ||
60 | /* | |
61 | * From: https://blog.ardy.io/2020/8/geraet-32620/ | |
62 | * | |
63 | * 00000000 01000000 01000011 10110111 01001010 01000011 11000011 01011000 | |
64 | * ^^^^^^^^ ^^^^^^^^ ^^^^^^^^| | | |
65 | * LIIIIIII LIILIIII LIIIILII | |
66 | * I I I | +-- Amplification (Default: 3) | |
67 | * I I I +----- Chip/Module Select lines/EOF? | |
68 | * I I +----------- Address (HI Byte) | |
69 | * I +---------------- Chip Select lines A15, A14, A13 | |
70 | * +-------------------- Address (LO Byte) | |
71 | */ | |
72 | for (i = 0; i < 62; i+=3) { | |
73 | uint8_t hi, lo, amp, cs; | |
74 | uint32_t adr; | |
75 | ||
76 | lo = header[i]; | |
77 | hi = header[i+1] & 0x1f; | |
78 | ||
79 | //!EOF ?! | |
80 | if ((header[i+2] & 0xf8) != 0xf8) | |
81 | cs2 = (header[i+2] & 0xf8) >> 3; | |
82 | ||
83 | if (cs2 & 0x08) { | |
84 | cs = ((header[i+1] & 0xe0) >> 5) - 2; | |
85 | } else { | |
86 | cs = (((header[i+1] & 0xe0) >> 5) | (1 << 3)) - 4; | |
87 | } | |
88 | ||
89 | amp = header[i+2] & 0x3; | |
90 | ||
91 | adr = ((hi << 8) | lo) + (cs * 8192); | |
92 | if (adr == 0) | |
93 | adr += sizeof(header); | |
94 | ||
95 | printf("%02d. hi: 0x%02x, lo: 0x%02x, cs: 0x%02x, cs2: 0x%02x -> chip: 0x%02x, adr: 0x%04x; amp: 0x%02x\n", | |
96 | i/3, hi, lo, | |
97 | ((header[i+1] & 0xe0) >> 5), | |
98 | ((header[i+2] & 0xf8) >> 3), | |
99 | cs, adr, amp); | |
100 | ||
101 | adrs[i/3] = adr; | |
102 | if ((header[i+2] & 0xf8) == 0xf8) | |
103 | break; | |
104 | ||
105 | count++; | |
106 | } | |
107 | ||
108 | for (i = 0; i < count; i++) { | |
109 | uint8_t buf[65536]; | |
110 | uint32_t len; | |
111 | char file[32]; | |
112 | int fd_out; | |
113 | ||
114 | lseek(fd, adrs[i], SEEK_SET); | |
115 | ||
116 | len = adrs[i+1] - adrs[i]; | |
117 | ||
118 | if (!len) | |
119 | break; | |
120 | ||
121 | printf("%02d. Length: %d\n", i, len); | |
122 | memset(file, 0, sizeof(file)); | |
123 | snprintf(file, sizeof(file)-1, "%s-%02d.raw", argv[2], i); | |
124 | ||
125 | fd_out = open(file, O_WRONLY|O_CREAT|O_TRUNC, 0644); | |
126 | if (fd_out == -1) { | |
127 | perror("Can't open out"); | |
128 | exit(EXIT_FAILURE); | |
129 | } | |
130 | ||
131 | r = read(fd, buf, len); | |
132 | if (r != len) { | |
133 | perror("Can't read content"); | |
134 | exit(EXIT_FAILURE); | |
135 | } | |
136 | ||
137 | r = write(fd_out, buf, len); | |
138 | if (r != len) { | |
139 | perror("Can't write content"); | |
140 | exit(EXIT_FAILURE); | |
141 | } | |
142 | ||
143 | close(fd_out); | |
144 | ||
145 | } | |
146 | ||
147 | close(fd); | |
148 | ||
149 | return EXIT_SUCCESS; | |
150 | } |