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1 | //********************************************************************************************** | |
2 | // | |
3 | // Title: GB to Video | |
4 | // Author: FriendofMegaman | |
5 | // | |
6 | // Cleaned a bit by Jazzmarazz | |
7 | // | |
8 | //********************************************************************************************** | |
9 | ||
10 | ||
11 | //********************************************************************************************** | |
12 | // | |
13 | // Designate Pins with Names | |
14 | // | |
15 | //********************************************************************************************** | |
16 | ||
17 | // Reassign according to your pinout | |
18 | const int pVsync = 2; | |
19 | const int pClock = 3; | |
20 | const int pData0 = 4; | |
21 | const int pData1 = 5; | |
22 | const int pHsync = 6; | |
23 | ||
24 | //********************************************************************************************** | |
25 | // | |
26 | // Create them Variables | |
27 | // | |
28 | //********************************************************************************************** | |
29 | ||
30 | int vsync = 0; | |
31 | int clock = 0; | |
32 | unsigned char data0 = 0; | |
33 | unsigned char data1 = 0; | |
34 | int hsync = 0; | |
35 | ||
36 | int vsync_prev = 0; | |
37 | int clock_prev = 0; | |
38 | - | // int hsync_read = 0; // Never got used it seems |
38 | + | |
39 | ||
40 | unsigned char pixel = 0; | |
41 | ||
42 | int line = 0; | |
43 | int offset = 0; | |
44 | ||
45 | int array_offset = 0; | |
46 | int byte_offset = 0; | |
47 | int bit_offset; | |
48 | ||
49 | unsigned char frame[5760]; | |
50 | ||
51 | void setup(){ | |
52 | - | Serial.begin(40000); |
52 | + | Serial.begin(1); |
53 | - | // Pins default to inputs. No need for PinMode |
53 | + | memset(frame,0,sizeof(frame)); |
54 | - | memset(frame,0,sizeof(frame)); // for (int i=0; i<5760; frame[i++]=0); |
54 | + | |
55 | ||
56 | //********************************************************************************************** | |
57 | // | |
58 | // Main Loop | |
59 | // | |
60 | //********************************************************************************************** | |
61 | ||
62 | void loop() { | |
63 | vsync = digitalRead(pVsync), | |
64 | clock = digitalRead(pClock), | |
65 | data0 = digitalRead(pData0), | |
66 | data1 = digitalRead(pData1), | |
67 | hsync = digitalRead(pHsync); | |
68 | ||
69 | readClock(); | |
70 | readHsync(); | |
71 | readVsync(); | |
72 | ||
73 | clock_prev = clock; | |
74 | vsync_prev = vsync; | |
75 | hsync_prev = hsync; | |
76 | } | |
77 | ||
78 | //********************************************************************************************** | |
79 | // | |
80 | // Read hsync | |
81 | // | |
82 | //********************************************************************************************** | |
83 | ||
84 | void readHsync(){ | |
85 | // Read HSYNC (rising edge) | |
86 | if (hsync_prev == LOW && hsync == HIGH){ | |
87 | // Next line | |
88 | line++; | |
89 | offset = 0; | |
90 | } | |
91 | return; | |
92 | } | |
93 | ||
94 | //********************************************************************************************** | |
95 | // | |
96 | // Read vsync | |
97 | // | |
98 | //********************************************************************************************** | |
99 | ||
100 | void readVsync(){ | |
101 | if (vsync_prev==LOW && vsync==HIGH){ | |
102 | // Next frame | |
103 | ||
104 | // Frame divider 0x1E001E00 | |
105 | - | // Frame divider 0x1E00 |
105 | + | |
106 | Serial.write(0x00); | |
107 | Serial.write(0x1E); | |
108 | Serial.write(0x00); | |
109 | ||
110 | - | for (int i=0; i<5760; i++){ |
110 | + | |
111 | - | Serial.write(frame[i]); |
111 | + | Serial.write(frame, 5760); |
112 | - | frame[i] = 0; |
112 | + | memset(frame, 0, sizeof(frame)); |
113 | - | } |
113 | + | |
114 | line = 0; | |
115 | offset = 0; | |
116 | } | |
117 | return; | |
118 | } | |
119 | ||
120 | //********************************************************************************************** | |
121 | // | |
122 | // Read clock | |
123 | // | |
124 | //********************************************************************************************** | |
125 | ||
126 | void readClock(){ | |
127 | if (clock_prev == HIGH && clock == LOW){ | |
128 | // Read pixels | |
129 | if (offset<160 && line<144){ | |
130 | ||
131 | pixel = 2*data1+data0; | |
132 | ||
133 | // ************ IMPORTANT ************ | |
134 | // This part could be implemented as 2-dimensional array, I'm just saving RAM. I tried to make it 2D and the result | |
135 | // was the same. | |
136 | // **************************************** | |
137 | // Offset in the frame bit map | |
138 | bit_offset = (line*320)+offset*2; | |
139 | ||
140 | // The actual char in the frame array | |
141 | array_offset = bit_offset/8; | |
142 | ||
143 | // The offset within one byte | |
144 | byte_offset = bit_offset%8; | |
145 | ||
146 | // Put the pixel into frame | |
147 | frame[array_offset]+=(pixel<<byte_offset); | |
148 | } | |
149 | offset++; | |
150 | } | |
151 | return; | |
152 | } |