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##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2019 Stephan Thiele <stephan.thiele@mailbox.org>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, see <http://www.gnu.org/licenses/>.
##
'''
This decoder stacks on top of the 'spi' PD and decodes the button states
of an NES gamepad.
The SPI decoder needs to be configured as follows:
Clock polarity = 1
Clock phase = 0
Bit order = msb-first
Word size = 8
Chip-select is not used and must not be assigned to any channel.
Hardware setup is as follows:
___
GND |o \
CUP |o o| VCC
OUT 0 |o o| D3
D1 |o o| D4
-----
NES Gamepad Connector
VCC - Power 5V
GND - Ground
CUP - Shift register clock (CLK)
OUT 0 - Shift register latch (optional)
D1 - Gamepad data (MOSI)
D3 - Data (unused)
D4 - Data (unused)
Data pins D3 and D4 are not used by the standard gamepad but
by special controllers like the Nintento Zapper light gun.
'''
from .pd import Decoder
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