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"""
# TOP2049 Open Source programming suite
#
# TOP2049 Shiftregister based layout definitions
#
# Copyright (c) 2010 Michael Buesch <m@bues.ch>
#
# 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""
from libtoprammer.generic_layout import *
class ShiftregLayout(GenericLayout):
def __init__(self, nrZifPins, nrShiftRegs):
GenericLayout.__init__(self, nrZifPins)
self.nrShiftRegs = nrShiftRegs
self.layouts = []
for id in range(0, len(self.shiftreg_masks)):
shreg_mask = self.shiftreg_masks[id]
zif_mask = 0
for bit in range(0, self.nrShiftRegs * 8):
if (shreg_mask & (1 << bit)) == 0:
continue
regId = self.__bitnr2shregId(bit)
zifPin = self.shreg2zif_map[regId]
zif_mask |= (1 << (zifPin - 1))
if id == 0 or zif_mask != 0:
self.layouts.append( (id, zif_mask) )
def __bitnr2shregId(self, bitNr):
register = bitNr // 8
pin = bitNr % 8
return "%d.%d" % (register, pin)
def supportedLayouts(self):
return self.layouts
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