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1 | ## | |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2019 Stephan Thiele <stephan.thiele@mailbox.org> | |
5 | ## | |
6 | ## This program is free software; you can redistribute it and/or modify | |
7 | ## it under the terms of the GNU General Public License as published by | |
8 | ## the Free Software Foundation; either version 2 of the License, or | |
9 | ## (at your option) any later version. | |
10 | ## | |
11 | ## This program is distributed in the hope that it will be useful, | |
12 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ## GNU General Public License for more details. | |
15 | ## | |
16 | ## You should have received a copy of the GNU General Public License | |
17 | ## along with this program; if not, see <http://www.gnu.org/licenses/>. | |
18 | ## | |
19 | ||
20 | ''' | |
21 | This decoder stacks on top of the 'spi' PD and decodes the button states | |
22 | of an NES gamepad. | |
23 | ||
24 | The SPI decoder needs to be configured as follows: | |
25 | ||
26 | Clock polarity = 1 | |
27 | Clock phase = 0 | |
28 | Bit order = msb-first | |
29 | Word size = 8 | |
30 | ||
31 | Chip-select is not used and must not be assigned to any channel. | |
32 | ||
33 | Hardware setup is as follows: | |
34 | ___ | |
35 | GND |o \ | |
36 | CUP |o o| VCC | |
37 | OUT 0 |o o| D3 | |
38 | D1 |o o| D4 | |
39 | ----- | |
40 | NES Gamepad Connector | |
41 | ||
42 | VCC - Power 5V | |
43 | GND - Ground | |
44 | CUP - Shift register clock (CLK) | |
45 | OUT 0 - Shift register latch (optional) | |
46 | D1 - Gamepad data (MOSI) | |
47 | D3 - Data (unused) | |
48 | D4 - Data (unused) | |
49 | ||
50 | Data pins D3 and D4 are not used by the standard gamepad but | |
51 | by special controllers like the Nintento Zapper light gun. | |
52 | ''' | |
53 | ||
54 | from .pd import Decoder |