[libsigrokdecode.git] / decoders / mx25lxx05d / mx25lxx05d.py

##
## This file is part of the sigrok project.
##
## Copyright (C) 2011-2012 Uwe Hermann <uwe@hermann-uwe.de>
##
## 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 St, Fifth Floor, Boston, MA  02110-1301 USA
##

# Macronix MX25Lxx05D SPI (NOR) flash chip protocol decoder

# Note: Works for MX25L1605D/MX25L3205D/MX25L6405D.

import sigrokdecode as srd

# States
IDLE = -1

# Chip commands (also used as additional decoder states).
CMD_WREN      = 0x06
CMD_WRDI      = 0x04
CMD_RDID      = 0x9f
CMD_RDSR      = 0x05
CMD_WRSR      = 0x01
CMD_READ      = 0x03
CMD_FAST_READ = 0x0b
CMD_2READ     = 0xbb
CMD_SE        = 0x20
CMD_BE        = 0xd8
CMD_CE        = 0x60
CMD_CE2       = 0xc7
CMD_PP        = 0x02
CMD_CP        = 0xad
CMD_DP        = 0xb9
# CMD_RDP       = 0xab
# CMD_RES       = 0xab
CMD_RDP_RES   = 0xab # Note: RDP/RES have the same ID.
CMD_REMS      = 0x90
CMD_REMS2     = 0xef
CMD_ENSO      = 0xb1
CMD_EXSO      = 0xc1
CMD_RDSCUR    = 0x2b
CMD_WRSCUR    = 0x2f
CMD_ESRY      = 0x70
CMD_DSRY      = 0x80

# TODO: (Short) command names as strings in a dict, too?

# Dict which maps command IDs to their description.
cmds = {
    CMD_WREN: 'Write enable',
    CMD_WRDI: 'Write disable',
    CMD_RDID: 'Read identification',
    CMD_RDSR: 'Read status register',
    CMD_WRSR: 'Write status register',
    CMD_READ: 'Read data',
    CMD_FAST_READ: 'Fast read data',
    CMD_2READ: '2x I/O read',
    CMD_SE: 'Sector erase',
    CMD_BE: 'Block erase',
    CMD_CE: 'Chip erase',
    CMD_CE2: 'Chip erase', # Alternative command ID
    CMD_PP: 'Page program',
    CMD_CP: 'Continuously program mode',
    CMD_DP: 'Deep power down',
    # CMD_RDP: 'Release from deep powerdown',
    # CMD_RES: 'Read electronic ID',
    CMD_RDP_RES: 'Release from deep powerdown / Read electronic ID',
    CMD_REMS: 'Read electronic manufacturer & device ID',
    CMD_REMS2: 'Read ID for 2x I/O mode',
    CMD_ENSO: 'Enter secured OTP',
    CMD_EXSO: 'Exit secured OTP',
    CMD_RDSCUR: 'Read security register',
    CMD_WRSCUR: 'Write security register',
    CMD_ESRY: 'Enable SO to output RY/BY#',
    CMD_DSRY: 'Disable SO to output RY/BY#',
}

device_name = {
    0x14: 'MX25L1605D',
    0x15: 'MX25L3205D',
    0x16: 'MX25L6405D',
}

class Decoder(srd.Decoder):
    api_version = 1
    id = 'mx25lxx05d'
    name = 'MX25Lxx05D'
    longname = 'Macronix MX25Lxx05D'
    desc = 'SPI (NOR) flash chip protocol.'
    license = 'gplv2+'
    inputs = ['spi', 'logic']
    outputs = ['mx25lxx05d']
    probes = []
    optional_probes = [
        {'id': 'hold', 'name': 'HOLD#', 'desc': 'TODO.'},
        {'id': 'wp_acc', 'name': 'WP#/ACC', 'desc': 'TODO.'},
    ]
    options = {} # TODO
    annotations = [
        ['Text', 'Human-readable text'],
    ]

    def __init__(self, **kwargs):
        self.state = IDLE
        self.cmdstate = 1 # TODO
        self.addr = 0
        self.data = []

    def start(self, metadata):
        # self.out_proto = self.add(srd.OUTPUT_PROTO, 'mx25lxx05d')
        self.out_ann = self.add(srd.OUTPUT_ANN, 'mx25lxx05d')

    def report(self):
        pass

    def putx(self, data):
        # Simplification, most annotations span exactly one SPI byte/packet.
        self.put(self.ss, self.es, self.out_ann, data)

    def handle_wren(self, mosi, miso):
        self.putx([0, ['Command: %s' % cmds[self.cmd]]])
        self.state = IDLE

    # TODO: Check/display device ID / name
    def handle_rdid(self, mosi, miso):
        if self.cmdstate == 1:
            # Byte 1: Master sends command ID.
            self.start_sample = self.ss
            self.putx([0, ['Command: %s' % cmds[self.cmd]]])
        elif self.cmdstate == 2:
            # Byte 2: Slave sends the JEDEC manufacturer ID.
            self.putx([0, ['Manufacturer ID: 0x%02x' % miso]])
        elif self.cmdstate == 3:
            # Byte 3: Slave sends the memory type (0x20 for this chip).
            self.putx([0, ['Memory type: 0x%02x' % miso]])
        elif self.cmdstate == 4:
            # Byte 4: Slave sends the device ID.
            self.device_id = miso
            self.putx([0, ['Device ID: 0x%02x' % miso]])

        if self.cmdstate == 4:
            # TODO: Check self.device_id is valid & exists in device_names.
            # TODO: Same device ID? Check!
            d = 'Device: Macronix %s' % device_name[self.device_id]
            self.put(self.start_sample, self.es, self.out_ann, [0, [d]])
            self.state = IDLE
        else:
            self.cmdstate += 1

    # TODO: Warn/abort if we don't see the necessary amount of bytes.
    # TODO: Warn if WREN was not seen before.
    def handle_se(self, mosi, miso):
        if self.cmdstate == 1:
            # Byte 1: Master sends command ID.
            self.addr = 0
            self.start_sample = self.ss
            self.putx([0, ['Command: %s' % cmds[self.cmd]]])
        elif self.cmdstate in (2, 3, 4):
            # Bytes 2/3/4: Master sends sectror address (24bits, MSB-first).
            self.addr |= (mosi << ((4 - self.cmdstate) * 8))
            # self.putx([0, ['Sector address, byte %d: 0x%02x' % \
            #                (4 - self.cmdstate, mosi)]])

        if self.cmdstate == 4:
            d = 'Erase sector %d (0x%06x)' % (self.addr, self.addr)
            self.put(self.start_sample, self.es, self.out_ann, [0, [d]])
            # TODO: Max. size depends on chip, check that too if possible.
            if self.addr % 4096 != 0:
                # Sector addresses must be 4K-aligned (same for all 3 chips).
                d = 'Warning: Invalid sector address!' # TODO: type == WARN?
                self.put(self.start_sample, self.es, self.out_ann, [0, [d]])
            self.state = IDLE
        else:
            self.cmdstate += 1

    def handle_rems(self, mosi, miso):
        if self.cmdstate == 1:
            # Byte 1: Master sends command ID.
            self.start_sample = self.ss
            self.putx([0, ['Command: %s' % cmds[self.cmd]]])
        elif self.cmdstate in (2, 3):
            # Bytes 2/3: Master sends two dummy bytes.
            # TODO: Check dummy bytes? Check reply from device?
            self.putx([0, ['Dummy byte: %s' % mosi]])
        elif self.cmdstate == 4:
            # Byte 4: Master sends 0x00 or 0x01.
            # 0x00: Master wants manufacturer ID as first reply byte.
            # 0x01: Master wants device ID as first reply byte.
            self.manufacturer_id_first = True if (mosi == 0x00) else False
            d = 'manufacturer' if (mosi == 0x00) else 'device'
            self.putx([0, ['Master wants %s ID first' % d]])
        elif self.cmdstate == 5:
            # Byte 5: Slave sends manufacturer ID (or device ID).
            self.ids = [miso]
            d = 'Manufacturer' if self.manufacturer_id_first else 'Device'
            self.putx([0, ['%s ID' % d]])
        elif self.cmdstate == 6:
            # Byte 6: Slave sends device ID (or manufacturer ID).
            self.ids.append(miso)
            d = 'Manufacturer' if self.manufacturer_id_first else 'Device'
            self.putx([0, ['%s ID' % d]])
        else:
            # TODO: Error?
            pass

        if self.cmdstate == 6:
            self.end_sample = self.es
            id = self.ids[1] if self.manufacturer_id_first else self.ids[0]
            self.putx([0, ['Device: Macronix %s' % device_name[id]]])
            self.state = IDLE
        else:
            self.cmdstate += 1

    def handle_rdsr(self, mosi, miso):
        # Read status register: Master asserts CS#, sends RDSR command,
        # reads status register byte. If CS# is kept asserted, the status
        # register can be read continuously / multiple times in a row.
        # When done, the master de-asserts CS# again.
        if self.cmdstate == 1:
            # Byte 1: Master sends command ID.
            self.putx([0, ['Command: %s' % cmds[self.cmd]]])
        elif self.cmdstate >= 2:
            # Bytes 2-x: Slave sends status register as long as master clocks.
            if self.cmdstate <= 3: # TODO: While CS# asserted.
                self.putx([0, ['Status register: 0x%02x' % miso]])
                # TODO: Decode status register bits.

            if self.cmdstate == 3: # TODO: If CS# got de-asserted.
                self.state = IDLE
                return

        self.cmdstate += 1

    def handle_pp(self, mosi, miso):
        # Page program: Master asserts CS#, sends PP command, sends 3-byte
        # page address, sends >= 1 data bytes, de-asserts CS#.
        if self.cmdstate == 1:
            # Byte 1: Master sends command ID.
            self.putx([0, ['Command: %s' % cmds[self.cmd]]])
        elif self.cmdstate in (2, 3, 4):
            # Bytes 2/3/4: Master sends page address (24bits, MSB-first).
            self.addr |= (mosi << ((4 - self.cmdstate) * 8))
            # self.putx([0, ['Page address, byte %d: 0x%02x' % \
            #                (4 - self.cmdstate, mosi)]])
            if self.cmdstate == 4:
                self.putx([0, ['Page address: 0x%06x' % self.addr]])
                self.addr = 0
        elif self.cmdstate >= 5:
            # Bytes 5-x: Master sends data bytes (until CS# de-asserted).
            # TODO: For now we hardcode 256 bytes per page / PP command.
            if self.cmdstate <= 256 + 4: # TODO: While CS# asserted.
                self.data.append(mosi)
                # self.putx([0, ['New data byte: 0x%02x' % mosi]])

            if self.cmdstate == 256 + 4: # TODO: If CS# got de-asserted.
                # s = ', '.join(map(hex, self.data))
                s = ''.join(map(chr, self.data))
                self.putx([0, ['Page data: %s' % s]])
                self.data = []
                self.state = IDLE
                return

        self.cmdstate += 1

    def handle_read(self, mosi, miso):
        # Read data bytes: Master asserts CS#, sends READ command, sends
        # 3-byte address, reads >= 1 data bytes, de-asserts CS#.
        if self.cmdstate == 1:
            # Byte 1: Master sends command ID.
            self.putx([0, ['Command: %s' % cmds[self.cmd]]])
        elif self.cmdstate in (2, 3, 4):
            # Bytes 2/3/4: Master sends read address (24bits, MSB-first).
            self.addr |= (mosi << ((4 - self.cmdstate) * 8))
            # self.putx([0, ['Read address, byte %d: 0x%02x' % \
            #                (4 - self.cmdstate, mosi)]])
            if self.cmdstate == 4:
                self.putx([0, ['Read address: 0x%06x' % self.addr]])
                self.addr = 0
        elif self.cmdstate >= 5:
            # Bytes 5-x: Master reads data bytes (until CS# de-asserted).
            # TODO: For now we hardcode 256 bytes per READ command.
            if self.cmdstate <= 256 + 4: # TODO: While CS# asserted.
                self.data.append(miso)
                # self.putx([0, ['New read byte: 0x%02x' % miso]])

            if self.cmdstate == 256 + 4: # TODO: If CS# got de-asserted.
                # s = ', '.join(map(hex, self.data))
                s = ''.join(map(chr, self.data))
                self.putx([0, ['Read data: %s' % s]])
                self.data = []
                self.state = IDLE
                return

        self.cmdstate += 1

    def decode(self, ss, es, data):

        ptype, mosi, miso = data

        # if ptype == 'DATA':
        #     s = 'MOSI: 0x%02x, MISO: 0x%02x' % (mosi, miso)
        #     self.put(0, 0, self.out_ann, [0, [s]])
        #     pass

        # if ptype == 'CS-CHANGE':
        #     if mosi == 1 and miso == 0:
        #         self.put(0, 0, self.out_ann, [0, ['Asserting CS#']])
        #     elif mosi == 0 and miso == 1:
        #         self.put(0, 0, self.out_ann, [0, ['De-asserting CS#']])
        #     return

        if ptype != 'DATA':
            return

        cmd = mosi
        self.ss, self.es = ss, es

        # If we encountered a known chip command, enter the resp. state.
        if self.state == IDLE:
            if cmd in cmds:
                self.state = cmd
                self.cmd = cmd # TODO: Eliminate?
                self.cmdstate = 1
            else:
                pass # TODO

        # Handle commands.
        # TODO: Use some generic way to invoke the resp. method.
        if self.state == CMD_WREN:
            self.handle_wren(mosi, miso)
        elif self.state == CMD_SE:
            self.handle_se(mosi, miso)
        elif self.state == CMD_RDID:
            self.handle_rdid(mosi, miso)
        elif self.state == CMD_REMS:
            self.handle_rems(mosi, miso)
        elif self.state == CMD_RDSR:
            self.handle_rdsr(mosi, miso)
        elif self.state == CMD_PP:
            self.handle_pp(mosi, miso)
        elif self.state == CMD_READ:
            self.handle_read(mosi, miso)
        else:
            self.put(0, 0, self.out_ann, [0, ['Unknown command: 0x%02x' % cmd]])
            self.state = IDLE
Commit	Line	Data
	1	##
	2	## This file is part of the sigrok project.
	3	##
	4	## Copyright (C) 2011-2012 Uwe Hermann <uwe@hermann-uwe.de>
	5	##
	6	## This program is free software; you can redistribute it and/or modify
	7	## it under the terms of the GNU General Public License as published by
	8	## the Free Software Foundation; either version 2 of the License, or
	9	## (at your option) any later version.
	10	##
	11	## This program is distributed in the hope that it will be useful,
	12	## but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	## GNU General Public License for more details.
	15	##
	16	## You should have received a copy of the GNU General Public License
	17	## along with this program; if not, write to the Free Software
	18	## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	##
	20
	21	# Macronix MX25Lxx05D SPI (NOR) flash chip protocol decoder
	22
	23	# Note: Works for MX25L1605D/MX25L3205D/MX25L6405D.
	24
	25	import sigrokdecode as srd
	26
	27	# States
	28	IDLE = -1
	29
	30	# Chip commands (also used as additional decoder states).
	31	CMD_WREN = 0x06
	32	CMD_WRDI = 0x04
	33	CMD_RDID = 0x9f
	34	CMD_RDSR = 0x05
	35	CMD_WRSR = 0x01
	36	CMD_READ = 0x03
	37	CMD_FAST_READ = 0x0b
	38	CMD_2READ = 0xbb
	39	CMD_SE = 0x20
	40	CMD_BE = 0xd8
	41	CMD_CE = 0x60
	42	CMD_CE2 = 0xc7
	43	CMD_PP = 0x02
	44	CMD_CP = 0xad
	45	CMD_DP = 0xb9
	46	# CMD_RDP = 0xab
	47	# CMD_RES = 0xab
	48	CMD_RDP_RES = 0xab # Note: RDP/RES have the same ID.
	49	CMD_REMS = 0x90
	50	CMD_REMS2 = 0xef
	51	CMD_ENSO = 0xb1
	52	CMD_EXSO = 0xc1
	53	CMD_RDSCUR = 0x2b
	54	CMD_WRSCUR = 0x2f
	55	CMD_ESRY = 0x70
	56	CMD_DSRY = 0x80
	57
	58	# TODO: (Short) command names as strings in a dict, too?
	59
	60	# Dict which maps command IDs to their description.
	61	cmds = {
	62	CMD_WREN: 'Write enable',
	63	CMD_WRDI: 'Write disable',
	64	CMD_RDID: 'Read identification',
	65	CMD_RDSR: 'Read status register',
	66	CMD_WRSR: 'Write status register',
	67	CMD_READ: 'Read data',
	68	CMD_FAST_READ: 'Fast read data',
	69	CMD_2READ: '2x I/O read',
	70	CMD_SE: 'Sector erase',
	71	CMD_BE: 'Block erase',
	72	CMD_CE: 'Chip erase',
	73	CMD_CE2: 'Chip erase', # Alternative command ID
	74	CMD_PP: 'Page program',
	75	CMD_CP: 'Continuously program mode',
	76	CMD_DP: 'Deep power down',
	77	# CMD_RDP: 'Release from deep powerdown',
	78	# CMD_RES: 'Read electronic ID',
	79	CMD_RDP_RES: 'Release from deep powerdown / Read electronic ID',
	80	CMD_REMS: 'Read electronic manufacturer & device ID',
	81	CMD_REMS2: 'Read ID for 2x I/O mode',
	82	CMD_ENSO: 'Enter secured OTP',
	83	CMD_EXSO: 'Exit secured OTP',
	84	CMD_RDSCUR: 'Read security register',
	85	CMD_WRSCUR: 'Write security register',
	86	CMD_ESRY: 'Enable SO to output RY/BY#',
	87	CMD_DSRY: 'Disable SO to output RY/BY#',
	88	}
	89
	90	device_name = {
	91	0x14: 'MX25L1605D',
	92	0x15: 'MX25L3205D',
	93	0x16: 'MX25L6405D',
	94	}
	95
	96	class Decoder(srd.Decoder):
	97	api_version = 1
	98	id = 'mx25lxx05d'
	99	name = 'MX25Lxx05D'
	100	longname = 'Macronix MX25Lxx05D'
	101	desc = 'SPI (NOR) flash chip protocol.'
	102	license = 'gplv2+'
	103	inputs = ['spi', 'logic']
	104	outputs = ['mx25lxx05d']
	105	probes = []
	106	optional_probes = [
	107	{'id': 'hold', 'name': 'HOLD#', 'desc': 'TODO.'},
	108	{'id': 'wp_acc', 'name': 'WP#/ACC', 'desc': 'TODO.'},
	109	]
	110	options = {} # TODO
	111	annotations = [
	112	['Text', 'Human-readable text'],
	113	]
	114
	115	def __init__(self, **kwargs):
	116	self.state = IDLE
	117	self.cmdstate = 1 # TODO
	118	self.addr = 0
	119	self.data = []
	120
	121	def start(self, metadata):
	122	# self.out_proto = self.add(srd.OUTPUT_PROTO, 'mx25lxx05d')
	123	self.out_ann = self.add(srd.OUTPUT_ANN, 'mx25lxx05d')
	124
	125	def report(self):
	126	pass
	127
	128	def putx(self, data):
	129	# Simplification, most annotations span exactly one SPI byte/packet.
	130	self.put(self.ss, self.es, self.out_ann, data)
	131
	132	def handle_wren(self, mosi, miso):
	133	self.putx([0, ['Command: %s' % cmds[self.cmd]]])
	134	self.state = IDLE
	135
	136	# TODO: Check/display device ID / name
	137	def handle_rdid(self, mosi, miso):
	138	if self.cmdstate == 1:
	139	# Byte 1: Master sends command ID.
	140	self.start_sample = self.ss
	141	self.putx([0, ['Command: %s' % cmds[self.cmd]]])
	142	elif self.cmdstate == 2:
	143	# Byte 2: Slave sends the JEDEC manufacturer ID.
	144	self.putx([0, ['Manufacturer ID: 0x%02x' % miso]])
	145	elif self.cmdstate == 3:
	146	# Byte 3: Slave sends the memory type (0x20 for this chip).
	147	self.putx([0, ['Memory type: 0x%02x' % miso]])
	148	elif self.cmdstate == 4:
	149	# Byte 4: Slave sends the device ID.
	150	self.device_id = miso
	151	self.putx([0, ['Device ID: 0x%02x' % miso]])
	152
	153	if self.cmdstate == 4:
	154	# TODO: Check self.device_id is valid & exists in device_names.
	155	# TODO: Same device ID? Check!
	156	d = 'Device: Macronix %s' % device_name[self.device_id]
	157	self.put(self.start_sample, self.es, self.out_ann, [0, [d]])
	158	self.state = IDLE
	159	else:
	160	self.cmdstate += 1
	161
	162	# TODO: Warn/abort if we don't see the necessary amount of bytes.
	163	# TODO: Warn if WREN was not seen before.
	164	def handle_se(self, mosi, miso):
	165	if self.cmdstate == 1:
	166	# Byte 1: Master sends command ID.
	167	self.addr = 0
	168	self.start_sample = self.ss
	169	self.putx([0, ['Command: %s' % cmds[self.cmd]]])
	170	elif self.cmdstate in (2, 3, 4):
	171	# Bytes 2/3/4: Master sends sectror address (24bits, MSB-first).
	172	self.addr \|= (mosi << ((4 - self.cmdstate) * 8))
	173	# self.putx([0, ['Sector address, byte %d: 0x%02x' % \
	174	# (4 - self.cmdstate, mosi)]])
	175
	176	if self.cmdstate == 4:
	177	d = 'Erase sector %d (0x%06x)' % (self.addr, self.addr)
	178	self.put(self.start_sample, self.es, self.out_ann, [0, [d]])
	179	# TODO: Max. size depends on chip, check that too if possible.
	180	if self.addr % 4096 != 0:
	181	# Sector addresses must be 4K-aligned (same for all 3 chips).
	182	d = 'Warning: Invalid sector address!' # TODO: type == WARN?
	183	self.put(self.start_sample, self.es, self.out_ann, [0, [d]])
	184	self.state = IDLE
	185	else:
	186	self.cmdstate += 1
	187
	188	def handle_rems(self, mosi, miso):
	189	if self.cmdstate == 1:
	190	# Byte 1: Master sends command ID.
	191	self.start_sample = self.ss
	192	self.putx([0, ['Command: %s' % cmds[self.cmd]]])
	193	elif self.cmdstate in (2, 3):
	194	# Bytes 2/3: Master sends two dummy bytes.
	195	# TODO: Check dummy bytes? Check reply from device?
	196	self.putx([0, ['Dummy byte: %s' % mosi]])
	197	elif self.cmdstate == 4:
	198	# Byte 4: Master sends 0x00 or 0x01.
	199	# 0x00: Master wants manufacturer ID as first reply byte.
	200	# 0x01: Master wants device ID as first reply byte.
	201	self.manufacturer_id_first = True if (mosi == 0x00) else False
	202	d = 'manufacturer' if (mosi == 0x00) else 'device'
	203	self.putx([0, ['Master wants %s ID first' % d]])
	204	elif self.cmdstate == 5:
	205	# Byte 5: Slave sends manufacturer ID (or device ID).
	206	self.ids = [miso]
	207	d = 'Manufacturer' if self.manufacturer_id_first else 'Device'
	208	self.putx([0, ['%s ID' % d]])
	209	elif self.cmdstate == 6:
	210	# Byte 6: Slave sends device ID (or manufacturer ID).
	211	self.ids.append(miso)
	212	d = 'Manufacturer' if self.manufacturer_id_first else 'Device'
	213	self.putx([0, ['%s ID' % d]])
	214	else:
	215	# TODO: Error?
	216	pass
	217
	218	if self.cmdstate == 6:
	219	self.end_sample = self.es
	220	id = self.ids[1] if self.manufacturer_id_first else self.ids[0]
	221	self.putx([0, ['Device: Macronix %s' % device_name[id]]])
	222	self.state = IDLE
	223	else:
	224	self.cmdstate += 1
	225
	226	def handle_rdsr(self, mosi, miso):
	227	# Read status register: Master asserts CS#, sends RDSR command,
	228	# reads status register byte. If CS# is kept asserted, the status
	229	# register can be read continuously / multiple times in a row.
	230	# When done, the master de-asserts CS# again.
	231	if self.cmdstate == 1:
	232	# Byte 1: Master sends command ID.
	233	self.putx([0, ['Command: %s' % cmds[self.cmd]]])
	234	elif self.cmdstate >= 2:
	235	# Bytes 2-x: Slave sends status register as long as master clocks.
	236	if self.cmdstate <= 3: # TODO: While CS# asserted.
	237	self.putx([0, ['Status register: 0x%02x' % miso]])
	238	# TODO: Decode status register bits.
	239
	240	if self.cmdstate == 3: # TODO: If CS# got de-asserted.
	241	self.state = IDLE
	242	return
	243
	244	self.cmdstate += 1
	245
	246	def handle_pp(self, mosi, miso):
	247	# Page program: Master asserts CS#, sends PP command, sends 3-byte
	248	# page address, sends >= 1 data bytes, de-asserts CS#.
	249	if self.cmdstate == 1:
	250	# Byte 1: Master sends command ID.
	251	self.putx([0, ['Command: %s' % cmds[self.cmd]]])
	252	elif self.cmdstate in (2, 3, 4):
	253	# Bytes 2/3/4: Master sends page address (24bits, MSB-first).
	254	self.addr \|= (mosi << ((4 - self.cmdstate) * 8))
	255	# self.putx([0, ['Page address, byte %d: 0x%02x' % \
	256	# (4 - self.cmdstate, mosi)]])
	257	if self.cmdstate == 4:
	258	self.putx([0, ['Page address: 0x%06x' % self.addr]])
	259	self.addr = 0
	260	elif self.cmdstate >= 5:
	261	# Bytes 5-x: Master sends data bytes (until CS# de-asserted).
	262	# TODO: For now we hardcode 256 bytes per page / PP command.
	263	if self.cmdstate <= 256 + 4: # TODO: While CS# asserted.
	264	self.data.append(mosi)
	265	# self.putx([0, ['New data byte: 0x%02x' % mosi]])
	266
	267	if self.cmdstate == 256 + 4: # TODO: If CS# got de-asserted.
	268	# s = ', '.join(map(hex, self.data))
	269	s = ''.join(map(chr, self.data))
	270	self.putx([0, ['Page data: %s' % s]])
	271	self.data = []
	272	self.state = IDLE
	273	return
	274
	275	self.cmdstate += 1
	276
	277	def handle_read(self, mosi, miso):
	278	# Read data bytes: Master asserts CS#, sends READ command, sends
	279	# 3-byte address, reads >= 1 data bytes, de-asserts CS#.
	280	if self.cmdstate == 1:
	281	# Byte 1: Master sends command ID.
	282	self.putx([0, ['Command: %s' % cmds[self.cmd]]])
	283	elif self.cmdstate in (2, 3, 4):
	284	# Bytes 2/3/4: Master sends read address (24bits, MSB-first).
	285	self.addr \|= (mosi << ((4 - self.cmdstate) * 8))
	286	# self.putx([0, ['Read address, byte %d: 0x%02x' % \
	287	# (4 - self.cmdstate, mosi)]])
	288	if self.cmdstate == 4:
	289	self.putx([0, ['Read address: 0x%06x' % self.addr]])
	290	self.addr = 0
	291	elif self.cmdstate >= 5:
	292	# Bytes 5-x: Master reads data bytes (until CS# de-asserted).
	293	# TODO: For now we hardcode 256 bytes per READ command.
	294	if self.cmdstate <= 256 + 4: # TODO: While CS# asserted.
	295	self.data.append(miso)
	296	# self.putx([0, ['New read byte: 0x%02x' % miso]])
	297
	298	if self.cmdstate == 256 + 4: # TODO: If CS# got de-asserted.
	299	# s = ', '.join(map(hex, self.data))
	300	s = ''.join(map(chr, self.data))
	301	self.putx([0, ['Read data: %s' % s]])
	302	self.data = []
	303	self.state = IDLE
	304	return
	305
	306	self.cmdstate += 1
	307
	308	def decode(self, ss, es, data):
	309
	310	ptype, mosi, miso = data
	311
	312	# if ptype == 'DATA':
	313	# s = 'MOSI: 0x%02x, MISO: 0x%02x' % (mosi, miso)
	314	# self.put(0, 0, self.out_ann, [0, [s]])
	315	# pass
	316
	317	# if ptype == 'CS-CHANGE':
	318	# if mosi == 1 and miso == 0:
	319	# self.put(0, 0, self.out_ann, [0, ['Asserting CS#']])
	320	# elif mosi == 0 and miso == 1:
	321	# self.put(0, 0, self.out_ann, [0, ['De-asserting CS#']])
	322	# return
	323
	324	if ptype != 'DATA':
	325	return
	326
	327	cmd = mosi
	328	self.ss, self.es = ss, es
	329
	330	# If we encountered a known chip command, enter the resp. state.
	331	if self.state == IDLE:
	332	if cmd in cmds:
	333	self.state = cmd
	334	self.cmd = cmd # TODO: Eliminate?
	335	self.cmdstate = 1
	336	else:
	337	pass # TODO
	338
	339	# Handle commands.
	340	# TODO: Use some generic way to invoke the resp. method.
	341	if self.state == CMD_WREN:
	342	self.handle_wren(mosi, miso)
	343	elif self.state == CMD_SE:
	344	self.handle_se(mosi, miso)
	345	elif self.state == CMD_RDID:
	346	self.handle_rdid(mosi, miso)
	347	elif self.state == CMD_REMS:
	348	self.handle_rems(mosi, miso)
	349	elif self.state == CMD_RDSR:
	350	self.handle_rdsr(mosi, miso)
	351	elif self.state == CMD_PP:
	352	self.handle_pp(mosi, miso)
	353	elif self.state == CMD_READ:
	354	self.handle_read(mosi, miso)
	355	else:
	356	self.put(0, 0, self.out_ann, [0, ['Unknown command: 0x%02x' % cmd]])
	357	self.state = IDLE
	358