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"""
# TOP2049 Open Source programming suite
#
# Atmel AT27C256R EPROM
#
# Copyright (c) 2012 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 chip import *
class Chip_at27c256r(Chip):
def __init__(self):
Chip.__init__(self,
chipPackage = "DIP28",
chipPinVCCX = 28,
chipPinsVPP = 1,
chipPinGND = 14)
self.sizeBytes = 32 * 1024
def readEEPROM(self):
self.__turnOn()
self.progressMeterInit("Reading EPROM", self.sizeBytes)
image, prevAddr, count = b"", None, 0
self.__setFlags(oe=0, ce=0)
for addr in range(0, self.sizeBytes):
self.progressMeter(addr)
if prevAddr is None or\
(prevAddr & 0xFF) != (addr & 0xFF):
self.__setAddrLow(addr & 0xFF)
if prevAddr is None or\
((prevAddr >> 8) & 0xFF) != ((addr >> 8) & 0xFF):
self.__setAddrHigh((addr >> 8) & 0xFF)
prevAddr = addr
self.__dataRead()
count += 1
if count == self.top.getBufferRegSize():
image += self.top.cmdReadBufferReg()
count = 0
if count:
image += self.top.cmdReadBufferReg()
self.__setFlags(oe=1, ce=1)
self.progressMeterFinish()
return image
# def writeEEPROM(self):
# pass#TODO
def __turnOn(self):
self.__setFlags()
self.top.cmdSetVCCXVoltage(5)
self.top.cmdSetVPPVoltage(5)
self.applyVCCX(True)
self.applyVPP(False)
self.applyGND(True)
def __setAddrLow(self, value):
self.top.cmdFPGAWrite(0x10, value)
def __setAddrHigh(self, value):
self.top.cmdFPGAWrite(0x11, value)
def __setDataPins(self, value):
self.top.cmdFPGAWrite(0x12, value)
def __setFlags(self, data_en=0, prog_en=0, ce=1, oe=1):
value = 0
if data_en:
value |= (1 << 0)
if prog_en:
value |= (1 << 1)
if ce:
value |= (1 << 2)
if oe:
value |= (1 << 3)
self.top.cmdFPGAWrite(0x13, value)
def __progPulse(self):
self.top.cmdFPGAWrite(0x14, 0)
def __dataRead(self):
self.top.cmdFPGARead(0x10)
ChipDescription(Chip_at27c256r,
bitfile = "at27c256r",
runtimeID = (0x000C, 0x01),
chipType = ChipDescription.TYPE_EPROM,
chipVendors = "Atmel",
description = "AT27C256R",
packages = ( ("DIP28", ""), )
)
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