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106 lines
3.0 KiB
Python
106 lines
3.0 KiB
Python
##
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## This file is part of the libsigrokdecode project.
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##
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## Copyright (C) 2019 Stephan Thiele <stephan.thiele@mailbox.org>
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##
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## This program is free software; you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation; either version 2 of the License, or
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## (at your option) any later version.
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##
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## This program is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with this program; if not, see <http://www.gnu.org/licenses/>.
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##
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import sigrokdecode as srd
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class Decoder(srd.Decoder):
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api_version = 3
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id = 'nes_gamepad'
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name = 'NES gamepad'
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longname = 'Nintendo Entertainment System gamepad'
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desc = 'NES gamepad button states.'
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license = 'gplv2+'
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inputs = ['spi']
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outputs = []
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tags = ['Retro computing']
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options = (
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# Currently only the standard controller is supported. This might be
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# extended by special controllers like the Nintendo Zapper light gun.
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{'id': 'variant', 'desc': 'Gamepad variant',
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'default': 'Standard gamepad', 'values': ('Standard gamepad',)},
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)
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annotations = (
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('button', 'Button state'),
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('no-press', 'No button press'),
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('not-connected', 'Gamepad unconnected')
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)
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annotation_rows = (
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('buttons', 'Button states', (0,)),
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('no-presses', 'No button presses', (1,)),
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('not-connected-vals', 'Gamepad unconnected', (2,)),
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)
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def __init__(self):
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self.reset()
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def reset(self):
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self.variant = None
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self.ss_block = None
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self.es_block = None
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def start(self):
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self.out_ann = self.register(srd.OUTPUT_ANN)
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self.variant = self.options['variant']
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def putx(self, data):
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self.put(self.ss_block, self.es_block, self.out_ann, data)
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def handle_data(self, value):
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if value == 0xFF:
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self.putx([1, ['No button is pressed']])
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return
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if value == 0x00:
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self.putx([2, ['Gamepad is not connected']])
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return
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buttons = [
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'A',
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'B',
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'Select',
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'Start',
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'North',
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'South',
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'West',
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'East'
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]
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bits = format(value, '08b')
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button_str = ''
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for b in enumerate(bits):
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button_index = b[0]
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button_is_pressed = b[1] == '0'
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if button_is_pressed:
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if button_str != '':
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button_str += ' + '
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button_str += buttons[button_index]
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self.putx([0, ['%s' % button_str]])
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def decode(self, ss, es, data):
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ptype, mosi, miso = data
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self.ss_block, self.es_block = ss, es
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if ptype != 'DATA':
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return
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self.handle_data(miso)
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