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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/>.
##
import sigrokdecode as srd
class Decoder(srd.Decoder):
api_version = 3
id = 'nes_gamepad'
name = 'NES gamepad'
longname = 'Nintendo Entertainment System gamepad'
desc = 'NES gamepad button states.'
license = 'gplv2+'
inputs = ['spi']
outputs = []
tags = ['Retro computing']
options = (
# Currently only the standard controller is supported. This might be
# extended by special controllers like the Nintendo Zapper light gun.
{'id': 'variant', 'desc': 'Gamepad variant',
'default': 'Standard gamepad', 'values': ('Standard gamepad',)},
)
annotations = (
('button', 'Button states'),
('no-press', 'No button press'),
('not-connected', 'Gamepad unconnected')
)
annotation_rows = (
('buttons', 'Button states', (0,)),
('no-press', 'No button press', (1,)),
('not-connected', 'Gamepad unconnected', (2,)),
)
def __init__(self):
self.reset()
def reset(self):
self.variant = None
self.ss_block = None
self.es_block = None
def start(self):
self.out_ann = self.register(srd.OUTPUT_ANN)
self.variant = self.options['variant']
def putx(self, data):
self.put(self.ss_block, self.es_block, self.out_ann, data)
def handle_data(self, value):
if value == 0xFF:
self.putx([1, ['No button is pressed']])
return
if value == 0x00:
self.putx([2, ['Gamepad is not connected']])
return
buttons = [
'A',
'B',
'Select',
'Start',
'North',
'South',
'West',
'East'
]
bits = format(value, '08b')
button_str = ''
for b in enumerate(bits):
button_index = b[0]
button_is_pressed = b[1] == '0'
if button_is_pressed:
if button_str != '':
button_str += ' + '
button_str += buttons[button_index]
self.putx([0, ['%s' % button_str]])
def decode(self, ss, es, data):
ptype, mosi, miso = data
self.ss_block, self.es_block = ss, es
if ptype != 'DATA':
return
self.handle_data(miso)
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