"""
#    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 libtoprammer.chip import *


class Chip_at27c256r(Chip):
	def __init__(self):
		Chip.__init__(self,
			      chipPackage = "DIP28",
			      chipPinVCC = 28,
			      chipPinsVPP = 1,
			      chipPinGND = 14)
		self.sizeBytes = 32 * 1024
		self.generic = GenericAlgorithms(self)
		self.addrSetter = AddrSetter(self, 0x10, 0x11)

	def readEEPROM(self):
		self.__turnOn()
		return self.generic.simpleReadEPROM(
			sizeBytes = self.sizeBytes,
			readData8Func = self.__dataRead,
			addrSetter = self.addrSetter,
			initFunc = lambda: self.__setFlags(oe=0, ce=0),
			exitFunc = lambda: self.__setFlags(oe=1, ce=1)
		)

#	def writeEEPROM(self):
#		pass#TODO

	def __turnOn(self):
		self.__setFlags()
		self.generic.simpleVoltageSetup()

	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", ""), )
)