# -*- coding: utf-8 -*-
#
# AWL simulator - instructions
#
# Copyright 2012-2013 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 awlsim.instructions.main import *


class AwlInsn_BTI(AwlInsn):
	def __init__(self, cpu, rawInsn):
		AwlInsn.__init__(self, cpu, AwlInsn.TYPE_BTI, rawInsn)
		self.assertOpCount(0)

	def run(self):
		accu1 = self.cpu.accu1.get()
		bcd = accu1 & 0xFFF
		a, b, c = (bcd & 0xF), ((bcd >> 4) & 0xF), ((bcd >> 8) & 0xF)
		if bcd > 0x999 or a > 9 or b > 9 or c > 9:
			raise AwlSimError("Invalid BCD value")
		binval = (a + (b * 10) + (c * 100)) & 0xFFFF
		if accu1 & 0x8000:
			binval = (-binval) & 0xFFFF
		self.cpu.accu1.setWord(binval)