1 Introduction
2 ------------
3
4 The VGAPIC32 project provides software and circuit information to generate an
5 analogue VGA signal from a PIC32 microcontroller. More details can be found in
6 the following article:
7
8 http://blogs.fsfe.org/pboddie/?p=1712
9
10 See also the docs directory for original versions of the different explanatory
11 diagrams.
12
13 Contact, Copyright and Licence Information
14 ------------------------------------------
15
16 The author can be contacted at the following e-mail address:
17
18 paul@boddie.org.uk
19
20 Copyright and licence information can be found in the docs directory - see
21 docs/COPYING.txt and docs/gpl-3.0.txt for more information.
22
23
24
25 Hardware Details
26 ================
27
28 The pin usage of this solution is documented below.
29
30 PIC32MX270F256B-50I/SP Pin Assignments
31 --------------------------------------
32
33 MCLR# 1 \/ 28
34 HSYNC/OC1/RA0 2 27
35 VSYNC/OC2/RA1 3 26 RB15/U1TX
36 D0/RB0 4 25 RB14
37 D1/RB1 5 24 RB13/U1RX
38 D2/RB2 6 23
39 D3/RB3 7 22 RB11/PGEC2
40 8 21 RB10/PGEC3
41 RA2 9 20
42 RA3 10 19
43 D4/RB4 11 18 RB9
44 12 17 RB8
45 13 16 RB7/D7
46 D5/RB5 14 15
47
48 Note that RB6 is not available on pin 15 on this device (it is needed for VBUS
49 unlike the MX170 variant).
50
51 UART Connections
52 ----------------
53
54 UART1 is exposed by the RB13 and RB15 pins.
55
56 Data Signal Routing
57 -------------------
58
59 For one bit of intensity, two bits per colour channel:
60
61 D7 -> 2200R -> I
62
63 I -> diode -> R
64 I -> diode -> G
65 I -> diode -> B
66
67 D6 (not connected)
68
69 D5 -> 470R -> R
70 D4 -> 1000R -> R
71 D3 -> 470R -> G
72 D2 -> 1000R -> G
73 D1 -> 470R -> B
74 D0 -> 1000R -> B
75
76 HSYNC -> HS
77 VSYNC -> VS
78
79 Output Socket Pinout
80 --------------------
81
82 5 (GND) 4 (NC) 3 (B) 2 (G) 1 (R)
83
84 10 (GND) 9 (NC) 8 (GND) 7 (GND) 6 (GND)
85
86 15 (NC) 14 (VS) 13 (HS) 12 (NC) 11 (NC)
87
88 Output Cable Pinout
89 -------------------
90
91 1 (R) 2 (G) 3 (B) 4 (NC) 5 (GND)
92
93 6 (GND) 7 (GND) 8 (GND) 9 (NC) 10 (GND)
94
95 11 (NC) 12 (NC) 13 (HS) 14 (VS) 15 (NC)
96
97 References
98 ----------
99
100 https://en.wikipedia.org/wiki/VGA_connector
101
102 http://papilio.cc/index.php?n=Papilio.VGAWing
103
104 http://lucidscience.com/pro-vga%20video%20generator-2.aspx
105
106 https://sites.google.com/site/h2obsession/CBM/C128/rgbi-to-vga
