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##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2016 fenugrec <fenugrec users.sourceforge.net>
##
## 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/>.
##
# TODO:
# - Annotations are very crude and could be improved.
# - Annotate every nibble? Would give insight on interrupted shifts.
# - Annotate invalid "command" nibbles while SYNC==1?
import sigrokdecode as srd
class Decoder(srd.Decoder):
api_version = 3
id = 'aud'
name = 'AUD'
longname = 'Advanced User Debugger'
desc = 'Renesas/Hitachi Advanced User Debugger (AUD) protocol.'
license = 'gplv2+'
inputs = ['logic']
outputs = ['aud']
channels = (
{'id': 'audck', 'name': 'AUDCK', 'desc': 'AUD clock'},
{'id': 'naudsync', 'name': 'nAUDSYNC', 'desc': 'AUD sync'},
{'id': 'audata3', 'name': 'AUDATA3', 'desc': 'AUD data line 3'},
{'id': 'audata2', 'name': 'AUDATA2', 'desc': 'AUD data line 2'},
{'id': 'audata1', 'name': 'AUDATA1', 'desc': 'AUD data line 1'},
{'id': 'audata0', 'name': 'AUDATA0', 'desc': 'AUD data line 0'},
)
annotations = (
('dest', 'Destination address'),
)
def __init__(self):
self.ncnt = 0
self.nmax = 0
self.addr = 0
self.lastaddr = 0
self.ss = 0
def start(self):
self.out_ann = self.register(srd.OUTPUT_ANN)
def putx(self, data):
self.put(self.ss, self.samplenum, self.out_ann, data)
def handle_clk_edge(self, clk, sync, datapins):
# Reconstruct nibble.
nib = 0
for i in range(4):
nib |= datapins[3-i] << i
# sync == 1: annotate if finished; update cmd.
# TODO: Annotate idle level (nibble = 0x03 && SYNC=1).
if sync == 1:
if (self.ncnt == self.nmax) and (self.nmax != 0):
# Done shifting an address: annotate.
self.putx([0, ['0x%08X' % self.addr]])
self.lastaddr = self.addr
self.ncnt = 0
self.addr = self.lastaddr
self.ss = self.samplenum
if nib == 0x08:
self.nmax = 1
elif nib == 0x09:
self.nmax = 2
elif nib == 0x0a:
self.nmax = 4
elif nib == 0x0b:
self.nmax = 8
else:
# Undefined or idle.
self.nmax = 0
else:
# sync == 0, valid cmd: start or continue shifting in nibbles.
if (self.nmax > 0):
# Clear tgt nibble.
self.addr &= ~(0x0F << (self.ncnt * 4))
# Set nibble.
self.addr |= nib << (self.ncnt * 4)
self.ncnt += 1
def decode(self):
while True:
pins = self.wait({0: 'r'})
clk = pins[0]
sync = pins[1]
d = pins[2:]
self.handle_clk_edge(clk, sync, d)
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