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#! /usr/bin/env python
###############################################################################
#
# simulavr - A simulator for the Atmel AVR family of microcontrollers.
# Copyright (C) 2001, 2002 Theodore A. Roth
#
# 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.
#
###############################################################################
#
# $Id: test_LD_Y_decr.py,v 1.1 2004/07/31 00:59:11 rivetwa Exp $
#
"""Test the LD_Y_decr opcode.
"""
import base_test
from registers import Reg, SREG
class LD_Y_decr_TestFail(base_test.TestFail): pass
class base_LD_Y_decr(base_test.opcode_test):
"""Generic test case for testing LD_Y_decr opcode.
LD_Y_decr - Load Indirect from data space to Register using index Y and
pre decrement Y.
Operation: Y <- Y - 1 then Rd <- (Y)
opcode is '1001 000d dddd 1010' where 0 <= d <= 31 and d != {28,29}
Only registers PC, R28, R29 and Rd should be changed.
"""
def setup(self):
# Set the register values
self.setup_regs[self.Rd] = 0
self.setup_regs[Reg.R28] = (self.Y & 0xff)
self.setup_regs[Reg.R29] = ((self.Y >> 8) & 0xff)
# set up the val in memory (memory is read after Y is decremented,
# thus we need to write to memory _at_ Y - 1)
self.mem_byte_write( self.Y - 1, self.Vd )
# Return the raw opcode
return 0x900A | (self.Rd << 4)
def analyze_results(self):
self.reg_changed.extend( [self.Rd, Reg.R28, Reg.R29] )
# check that result is correct
expect = self.Vd
got = self.anal_regs[self.Rd]
if expect != got:
self.fail('LD_Y_decr: expect=%02x, got=%02x' % (expect, got))
# check that Y was decremented
expect = self.Y - 1
got = (self.anal_regs[Reg.R28] & 0xff) | ((self.anal_regs[Reg.R29] << 8) & 0xff00)
if expect != got:
self.fail('LD_Y_decr Y not decr: expect=%04x, got=%04x' % (expect, got))
#
# Template code for test case.
# The fail method will raise a test specific exception.
#
template = """
class LD_Y_decr_r%02d_Y%04x_v%02x_TestFail(LD_Y_decr_TestFail): pass
class test_LD_Y_decr_r%02d_Y%04x_v%02x(base_LD_Y_decr):
Rd = %d
Y = 0x%x
Vd = 0x%x
def fail(self,s):
raise LD_Y_decr_r%02d_Y%04x_v%02x_TestFail(s)
"""
#
# automagically generate the test_LD_Y_decr_rNN_vXX class definitions.
#
# Operation is undefined for d = 28 and d = 29.
#
code = ''
for d in list(range(0,28))+list(range(30,32)):
for y in (0x20f, 0x2ff):
for v in (0xaa, 0x55):
args = (d,y,v)*4
code += template % args
exec(code)
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