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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 | import sigrokdecode as srd | |
21 | ||
22 | class Decoder(srd.Decoder): | |
23 | api_version = 3 | |
24 | id = 'nes_gamepad' | |
25 | name = 'NES gamepad' | |
26 | longname = 'Nintendo Entertainment System gamepad' | |
27 | desc = 'NES gamepad button states.' | |
28 | license = 'gplv2+' | |
29 | inputs = ['spi'] | |
30 | outputs = [] | |
31 | tags = ['Retro computing'] | |
32 | options = ( | |
33 | # Currently only the standard controller is supported. This might be | |
34 | # extended by special controllers like the Nintendo Zapper light gun. | |
35 | {'id': 'variant', 'desc': 'Gamepad variant', | |
36 | 'default': 'Standard gamepad', 'values': ('Standard gamepad',)}, | |
37 | ) | |
38 | annotations = ( | |
39 | ('button', 'Button states'), | |
40 | ('no-press', 'No button press'), | |
41 | ('not-connected', 'Gamepad unconnected') | |
42 | ) | |
43 | annotation_rows = ( | |
44 | ('buttons', 'Button states', (0,)), | |
45 | ('no-press', 'No button press', (1,)), | |
46 | ('not-connected', 'Gamepad unconnected', (2,)), | |
47 | ) | |
48 | ||
49 | def __init__(self): | |
50 | self.reset() | |
51 | ||
52 | def reset(self): | |
53 | self.variant = None | |
54 | self.ss_block = None | |
55 | self.es_block = None | |
56 | ||
57 | def start(self): | |
58 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
59 | self.variant = self.options['variant'] | |
60 | ||
61 | def putx(self, data): | |
62 | self.put(self.ss_block, self.es_block, self.out_ann, data) | |
63 | ||
64 | def handle_data(self, value): | |
65 | if value == 0xFF: | |
66 | self.putx([1, ['No button is pressed']]) | |
67 | return | |
68 | ||
69 | if value == 0x00: | |
70 | self.putx([2, ['Gamepad is not connected']]) | |
71 | return | |
72 | ||
73 | buttons = [ | |
74 | 'A', | |
75 | 'B', | |
76 | 'Select', | |
77 | 'Start', | |
78 | 'North', | |
79 | 'South', | |
80 | 'West', | |
81 | 'East' | |
82 | ] | |
83 | ||
84 | bits = format(value, '08b') | |
85 | button_str = '' | |
86 | ||
87 | for b in enumerate(bits): | |
88 | button_index = b[0] | |
89 | button_is_pressed = b[1] == '0' | |
90 | ||
91 | if button_is_pressed: | |
92 | if button_str != '': | |
93 | button_str += ' + ' | |
94 | button_str += buttons[button_index] | |
95 | ||
96 | self.putx([0, ['%s' % button_str]]) | |
97 | ||
98 | def decode(self, ss, es, data): | |
99 | ptype, mosi, miso = data | |
100 | self.ss_block, self.es_block = ss, es | |
101 | ||
102 | if ptype != 'DATA': | |
103 | return | |
104 | ||
105 | self.handle_data(miso) |