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##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2019 Federico Cerutti <federico@ceres-c.it>
##
## 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, see <http://www.gnu.org/licenses/>.
##
import sigrokdecode as srd
'''
OUTPUT_PYTHON format:
Packet:
[<ptype>, <pdata>]
<ptype>:
- 'RESET' (Reset/Abort condition)
- 'ATR' (ATR data from card)
- 'CMD' (Command from reader)
- 'DATA' (Data from card)
<pdata> is the data to/from the card
For 'RESET' <pdata> is None.
'''
# CMD: [annotation-type-index, long annotation, short annotation]
proto = {
'RESET': [0, 'Reset', 'R'],
'ATR': [1, 'ATR', 'ATR'],
'CMD': [2, 'Command', 'C'],
'DATA': [3, 'Data', 'D'],
}
class Decoder(srd.Decoder):
api_version = 3
id = 'sle44xx'
name = 'SLE 44xx'
longname = 'SLE44xx protocol'
desc = 'SLE 4418/28/32/42 memory card serial protocol'
license = 'gplv2+'
inputs = ['logic']
outputs = ['sle44xx']
tags = ['Memory']
channels = (
{'id': 'rst', 'name': 'RST', 'desc': 'Reset line'},
{'id': 'clk', 'name': 'CLK', 'desc': 'Clock line'},
{'id': 'io', 'name': 'I/O', 'desc': 'I/O data line'},
)
annotations = (
('reset', 'Reset'),
('atr', 'ATR'),
('cmd', 'Command'),
('data', 'Data exchange'),
('bit', 'Bit'),
)
annotation_rows = (
('bits', 'Bits', (4,)),
('fields', 'Fields', (1, 2, 3)),
('interrupts', 'Interrupts', (0,)),
)
binary = (
('send-data', 'Send data'),
)
def __init__(self):
self.reset()
def reset(self):
self.ss = self.es = self.ss_byte = -1
self.bitcount = 0
self.databyte = 0
self.bits = []
self.cmd = 'RESET'
def metadata(self, key, value):
if key == srd.SRD_CONF_SAMPLERATE:
self.samplerate = value
def start(self):
self.out_python = self.register(srd.OUTPUT_PYTHON)
self.out_ann = self.register(srd.OUTPUT_ANN)
self.out_binary = self.register(srd.OUTPUT_BINARY)
def putx(self, data):
self.put(self.ss, self.es, self.out_ann, data)
def putp(self, data):
self.put(self.ss, self.es, self.out_python, data)
def putb(self, data):
self.put(self.ss, self.es, self.out_binary, data)
def handle_reset(self, pins):
self.ss, self.es = self.samplenum, self.samplenum
cmd = 'RESET' # No need to set the global self.cmd as this command is atomic
self.putp([cmd, None])
self.putx([proto[cmd][0], proto[cmd][1:]])
self.bitcount = self.databyte = 0
self.bits = []
self.cmd = 'ATR' # Next data bytes will be ATR
def handle_command(self, pins):
rst, clk, io = pins
self.ss, self.es = self.samplenum, self.samplenum
# If I/O is rising -> command START
# if I/O is falling -> command STOP and response data incoming
self.cmd = 'CMD' if (io == 0) else 'DATA'
self.bitcount = self.databyte = 0
self.bits = []
# Gather 8 bits of data
def handle_data(self, pins):
rst, clk, io = pins
# Data is transmitted LSB-first.
self.databyte |= (io << self.bitcount)
# Remember the start of the first data/address bit.
if self.bitcount == 0:
self.ss_byte = self.samplenum
# Store individual bits and their start/end samplenumbers.
# In the list, index 0 represents the LSB (SLE44xx transmits LSB-first).
self.bits.insert(0, [io, self.samplenum, self.samplenum])
if self.bitcount > 0:
self.bits[1][2] = self.samplenum
if self.bitcount == 7:
self.bitwidth = self.bits[1][2] - self.bits[2][2]
self.bits[0][2] += self.bitwidth
# Return if we haven't collected all 8 bits, yet.
if self.bitcount < 7:
self.bitcount += 1
return
self.ss, self.es = self.ss_byte, self.samplenum + self.bitwidth
self.putb([0, bytes([self.databyte])])
for bit in self.bits:
self.put(bit[1], bit[2], self.out_ann, [4, ['%d' % bit[0]]])
self.putx([proto[self.cmd][0], ['%s: %02X' % (proto[self.cmd][1], self.databyte),
'%s: %02X' % (proto[self.cmd][2], self.databyte), '%02X' % self.databyte]])
# Done with this packet.
self.bitcount = self.databyte = 0
self.bits = []
def decode(self):
while True:
pins = self.wait([{0: 'r'}, {0: 'l', 1: 'r'}, {1: 'h', 2: 'f'}, {1: 'h', 2: 'r'}])
if self.matched[0]: # RESET condition (R): RST = rising
self.handle_reset(pins)
elif self.matched[1]: # Incoming data (D): RST = low, CLK = rising.
self.handle_data(pins)
elif self.matched[2]: # Command mode START: CLK = high, I/O = falling.
self.handle_command(pins)
elif self.matched[3]: # Command mode STOP: CLK = high, I/O = rising.
self.handle_command(pins)
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