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55 lines
1.5 KiB
Python
55 lines
1.5 KiB
Python
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##
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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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'''
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This decoder stacks on top of the 'spi' PD and decodes the button states
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of an NES gamepad.
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The SPI decoder needs to be configured as follows:
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Clock polarity = 1
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Clock phase = 0
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Bit order = msb-first
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Word size = 8
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Chip-select is not used and must not be assigned to any channel.
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Hardware setup is as follows:
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___
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GND |o \
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CUP |o o| VCC
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OUT 0 |o o| D3
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D1 |o o| D4
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-----
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NES Gamepad Connector
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VCC - Power 5V
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GND - Ground
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CUP - Shift register clock (CLK)
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OUT 0 - Shift register latch (optional)
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D1 - Gamepad data (MOSI)
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D3 - Data (unused)
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D4 - Data (unused)
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Data pins D3 and D4 are not used by the standard gamepad but
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by special controllers like the Nintento Zapper light gun.
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'''
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from .pd import Decoder
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